Frame timing

.gitea/workflows/ci.yml

@@ -57,11 +57,11 @@ jobs:
 
       - name: Build Debug
         shell: powershell
-        run: cmake --build --preset build-debug
+        run: cmake --build --preset build-debug --parallel
 
       - name: Run Native Tests And Shader Validation
         shell: powershell
-        run: cmake --build --preset build-debug --target RUN_TESTS
+        run: cmake --build --preset build-debug --target RUN_TESTS --parallel
 
   ui-ubuntu:
     name: React UI Build
@@ -136,7 +136,7 @@ jobs:
 
       - name: Build Release
         shell: powershell
-        run: cmake --build --preset build-release
+        run: cmake --build --preset build-release --parallel
 
       - name: Install Runtime Package
         shell: powershell

.vscode/launch.json

@@ -11,6 +11,55 @@
       "cwd": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
       "environment": [],
       "console": "internalConsole",
+      "symbolSearchPath": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
+      "requireExactSource": true,
+      "logging": {
+        "moduleLoad": true
+      },
+      "preLaunchTask": "Build LoopThroughWithOpenGLCompositing Debug x64"
+    },
+    {
+      "name": "Debug LoopThroughWithOpenGLCompositing - sync readback experiment",
+      "type": "cppvsdbg",
+      "request": "launch",
+      "program": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug\\LoopThroughWithOpenGLCompositing.exe",
+      "args": [],
+      "stopAtEntry": false,
+      "cwd": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
+      "environment": [
+        {
+          "name": "VST_OUTPUT_READBACK_MODE",
+          "value": "sync"
+        }
+      ],
+      "console": "internalConsole",
+      "symbolSearchPath": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
+      "requireExactSource": true,
+      "logging": {
+        "moduleLoad": true
+      },
+      "preLaunchTask": "Build LoopThroughWithOpenGLCompositing Debug x64"
+    },
+    {
+      "name": "Debug LoopThroughWithOpenGLCompositing - cached output experiment",
+      "type": "cppvsdbg",
+      "request": "launch",
+      "program": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug\\LoopThroughWithOpenGLCompositing.exe",
+      "args": [],
+      "stopAtEntry": false,
+      "cwd": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
+      "environment": [
+        {
+          "name": "VST_OUTPUT_READBACK_MODE",
+          "value": "cached_only"
+        }
+      ],
+      "console": "internalConsole",
+      "symbolSearchPath": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
+      "requireExactSource": true,
+      "logging": {
+        "moduleLoad": true
+      },
       "preLaunchTask": "Build LoopThroughWithOpenGLCompositing Debug x64"
     }
   ]

.vscode/tasks.json

@@ -11,7 +11,8 @@
         "--config",
         "Debug",
         "--target",
-        "LoopThroughWithOpenGLCompositing"
+        "LoopThroughWithOpenGLCompositing",
+        "--parallel"
       ],
       "group": {
         "kind": "build",
@@ -29,7 +30,8 @@
         "--config",
         "Release",
         "--target",
-        "LoopThroughWithOpenGLCompositing"
+        "LoopThroughWithOpenGLCompositing",
+        "--parallel"
       ],
       "group": "build",
       "problemMatcher": "$msCompile"

CMakeLists.txt

@@ -34,10 +34,14 @@ set(APP_SOURCES
 	"${APP_DIR}/videoio/decklink/DeckLinkAPI_i.c"
 	"${APP_DIR}/control/ControlServer.cpp"
 	"${APP_DIR}/control/ControlServer.h"
+	"${APP_DIR}/control/ControlServices.cpp"
+	"${APP_DIR}/control/ControlServices.h"
 	"${APP_DIR}/control/OscServer.cpp"
 	"${APP_DIR}/control/OscServer.h"
 	"${APP_DIR}/control/RuntimeControlBridge.cpp"
 	"${APP_DIR}/control/RuntimeControlBridge.h"
+	"${APP_DIR}/control/RuntimeServiceLiveBridge.cpp"
+	"${APP_DIR}/control/RuntimeServiceLiveBridge.h"
 	"${APP_DIR}/control/RuntimeServices.cpp"
 	"${APP_DIR}/control/RuntimeServices.h"
 	"${APP_DIR}/videoio/decklink/DeckLinkAPI_h.h"
@@ -57,9 +61,18 @@ set(APP_SOURCES
 	"${APP_DIR}/gl/renderer/GlScopedObjects.h"
 	"${APP_DIR}/gl/shader/GlShaderSources.cpp"
 	"${APP_DIR}/gl/shader/GlShaderSources.h"
-	"${APP_DIR}/gl/OpenGLComposite.cpp"
-	"${APP_DIR}/gl/OpenGLComposite.h"
-	"${APP_DIR}/gl/OpenGLCompositeRuntimeControls.cpp"
+	"${APP_DIR}/gl/composite/OpenGLComposite.cpp"
+	"${APP_DIR}/gl/composite/OpenGLComposite.h"
+	"${APP_DIR}/gl/composite/OpenGLCompositeRuntimeControls.cpp"
+	"${APP_DIR}/gl/threading/RenderCommandQueue.cpp"
+	"${APP_DIR}/gl/threading/RenderCommandQueue.h"
+	"${APP_DIR}/gl/RenderEngine.cpp"
+	"${APP_DIR}/gl/RenderEngine.h"
+	"${APP_DIR}/gl/frame/RenderFrameState.h"
+	"${APP_DIR}/gl/frame/RenderFrameStateResolver.cpp"
+	"${APP_DIR}/gl/frame/RenderFrameStateResolver.h"
+	"${APP_DIR}/gl/frame/RuntimeUpdateController.cpp"
+	"${APP_DIR}/gl/frame/RuntimeUpdateController.h"
 	"${APP_DIR}/gl/pipeline/OpenGLRenderPass.cpp"
 	"${APP_DIR}/gl/pipeline/OpenGLRenderPass.h"
 	"${APP_DIR}/gl/pipeline/OpenGLRenderPipeline.cpp"
@@ -96,14 +109,50 @@ set(APP_SOURCES
 	"${APP_DIR}/platform/NativeHandles.h"
 	"${APP_DIR}/platform/NativeSockets.h"
 	"${APP_DIR}/resource.h"
-	"${APP_DIR}/runtime/RuntimeHost.cpp"
-	"${APP_DIR}/runtime/RuntimeHost.h"
-	"${APP_DIR}/runtime/RuntimeClock.cpp"
-	"${APP_DIR}/runtime/RuntimeClock.h"
-	"${APP_DIR}/runtime/RuntimeJson.cpp"
-	"${APP_DIR}/runtime/RuntimeJson.h"
-	"${APP_DIR}/runtime/RuntimeParameterUtils.cpp"
-	"${APP_DIR}/runtime/RuntimeParameterUtils.h"
+	"${APP_DIR}/runtime/coordination/RuntimeCoordinator.cpp"
+	"${APP_DIR}/runtime/coordination/RuntimeCoordinator.h"
+	"${APP_DIR}/runtime/events/RuntimeEventCoalescingQueue.h"
+	"${APP_DIR}/runtime/events/RuntimeEventDispatcher.h"
+	"${APP_DIR}/runtime/events/RuntimeEvent.h"
+	"${APP_DIR}/runtime/events/RuntimeEventPayloads.h"
+	"${APP_DIR}/runtime/events/RuntimeEventQueue.h"
+	"${APP_DIR}/runtime/events/RuntimeEventType.h"
+	"${APP_DIR}/runtime/live/CommittedLiveState.cpp"
+	"${APP_DIR}/runtime/live/CommittedLiveState.h"
+	"${APP_DIR}/runtime/live/RenderStateComposer.cpp"
+	"${APP_DIR}/runtime/live/RenderStateComposer.h"
+	"${APP_DIR}/runtime/live/RuntimeStateLayerModel.cpp"
+	"${APP_DIR}/runtime/live/RuntimeStateLayerModel.h"
+	"${APP_DIR}/runtime/live/RuntimeLiveState.cpp"
+	"${APP_DIR}/runtime/live/RuntimeLiveState.h"
+	"${APP_DIR}/runtime/persistence/PersistenceRequest.h"
+	"${APP_DIR}/runtime/persistence/PersistenceWriter.cpp"
+	"${APP_DIR}/runtime/persistence/PersistenceWriter.h"
+	"${APP_DIR}/runtime/presentation/RuntimeStateJson.cpp"
+	"${APP_DIR}/runtime/presentation/RuntimeStateJson.h"
+	"${APP_DIR}/runtime/presentation/RuntimeStatePresenter.cpp"
+	"${APP_DIR}/runtime/presentation/RuntimeStatePresenter.h"
+	"${APP_DIR}/runtime/snapshot/RenderSnapshotBuilder.cpp"
+	"${APP_DIR}/runtime/snapshot/RenderSnapshotBuilder.h"
+	"${APP_DIR}/runtime/snapshot/RuntimeSnapshotProvider.cpp"
+	"${APP_DIR}/runtime/snapshot/RuntimeSnapshotProvider.h"
+	"${APP_DIR}/runtime/store/LayerStackStore.cpp"
+	"${APP_DIR}/runtime/store/LayerStackStore.h"
+	"${APP_DIR}/runtime/store/RuntimeConfigStore.cpp"
+	"${APP_DIR}/runtime/store/RuntimeConfigStore.h"
+	"${APP_DIR}/runtime/store/RuntimeStore.cpp"
+	"${APP_DIR}/runtime/store/RuntimeStore.h"
+	"${APP_DIR}/runtime/store/RuntimeStoreReadModels.h"
+	"${APP_DIR}/runtime/store/ShaderPackageCatalog.cpp"
+	"${APP_DIR}/runtime/store/ShaderPackageCatalog.h"
+	"${APP_DIR}/runtime/support/RuntimeJson.cpp"
+	"${APP_DIR}/runtime/support/RuntimeJson.h"
+	"${APP_DIR}/runtime/support/RuntimeParameterUtils.cpp"
+	"${APP_DIR}/runtime/support/RuntimeParameterUtils.h"
+	"${APP_DIR}/runtime/telemetry/HealthTelemetry.cpp"
+	"${APP_DIR}/runtime/telemetry/HealthTelemetry.h"
+	"${APP_DIR}/runtime/telemetry/RuntimeClock.cpp"
+	"${APP_DIR}/runtime/telemetry/RuntimeClock.h"
 	"${APP_DIR}/shader/ShaderCompiler.cpp"
 	"${APP_DIR}/shader/ShaderCompiler.h"
 	"${APP_DIR}/shader/ShaderPackageRegistry.cpp"
@@ -114,7 +163,20 @@ set(APP_SOURCES
 	"${APP_DIR}/targetver.h"
 	"${APP_DIR}/videoio/VideoIOFormat.cpp"
 	"${APP_DIR}/videoio/VideoIOFormat.h"
+	"${APP_DIR}/videoio/VideoBackend.cpp"
+	"${APP_DIR}/videoio/VideoBackend.h"
+	"${APP_DIR}/videoio/VideoBackendLifecycle.cpp"
+	"${APP_DIR}/videoio/VideoBackendLifecycle.h"
 	"${APP_DIR}/videoio/VideoIOTypes.h"
+	"${APP_DIR}/videoio/OutputProductionController.cpp"
+	"${APP_DIR}/videoio/OutputProductionController.h"
+	"${APP_DIR}/videoio/RenderCadenceController.cpp"
+	"${APP_DIR}/videoio/RenderCadenceController.h"
+	"${APP_DIR}/videoio/RenderOutputQueue.cpp"
+	"${APP_DIR}/videoio/RenderOutputQueue.h"
+	"${APP_DIR}/videoio/SystemOutputFramePool.cpp"
+	"${APP_DIR}/videoio/SystemOutputFramePool.h"
+	"${APP_DIR}/videoio/VideoPlayoutPolicy.h"
 	"${APP_DIR}/videoio/VideoPlayoutScheduler.cpp"
 	"${APP_DIR}/videoio/VideoPlayoutScheduler.h"
 )
@@ -125,11 +187,23 @@ target_include_directories(LoopThroughWithOpenGLCompositing PRIVATE
 	"${APP_DIR}"
 	"${APP_DIR}/control"
 	"${APP_DIR}/gl"
+	"${APP_DIR}/gl/composite"
+	"${APP_DIR}/gl/frame"
 	"${APP_DIR}/gl/pipeline"
 	"${APP_DIR}/gl/renderer"
 	"${APP_DIR}/gl/shader"
+	"${APP_DIR}/gl/threading"
 	"${APP_DIR}/platform"
 	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/coordination"
+	"${APP_DIR}/runtime/events"
+	"${APP_DIR}/runtime/live"
+	"${APP_DIR}/runtime/persistence"
+	"${APP_DIR}/runtime/presentation"
+	"${APP_DIR}/runtime/snapshot"
+	"${APP_DIR}/runtime/store"
+	"${APP_DIR}/runtime/support"
+	"${APP_DIR}/runtime/telemetry"
 	"${APP_DIR}/shader"
 	"${APP_DIR}/videoio"
 	"${APP_DIR}/videoio/decklink"
@@ -156,13 +230,14 @@ if(MSVC)
 endif()
 
 add_executable(RuntimeJsonTests
-	"${APP_DIR}/runtime/RuntimeJson.cpp"
+	"${APP_DIR}/runtime/support/RuntimeJson.cpp"
 	"${CMAKE_CURRENT_SOURCE_DIR}/tests/RuntimeJsonTests.cpp"
 )
 
 target_include_directories(RuntimeJsonTests PRIVATE
 	"${APP_DIR}"
 	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/support"
 )
 
 if(MSVC)
@@ -173,13 +248,14 @@ enable_testing()
 add_test(NAME RuntimeJsonTests COMMAND RuntimeJsonTests)
 
 add_executable(RuntimeClockTests
-	"${APP_DIR}/runtime/RuntimeClock.cpp"
+	"${APP_DIR}/runtime/telemetry/RuntimeClock.cpp"
 	"${CMAKE_CURRENT_SOURCE_DIR}/tests/RuntimeClockTests.cpp"
 )
 
 target_include_directories(RuntimeClockTests PRIVATE
 	"${APP_DIR}"
 	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/telemetry"
 )
 
 if(MSVC)
@@ -188,15 +264,33 @@ endif()
 
 add_test(NAME RuntimeClockTests COMMAND RuntimeClockTests)
 
+add_executable(HealthTelemetryTests
+	"${APP_DIR}/runtime/telemetry/HealthTelemetry.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/HealthTelemetryTests.cpp"
+)
+
+target_include_directories(HealthTelemetryTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/telemetry"
+)
+
+if(MSVC)
+	target_compile_options(HealthTelemetryTests PRIVATE /W3)
+endif()
+
+add_test(NAME HealthTelemetryTests COMMAND HealthTelemetryTests)
+
 add_executable(RuntimeParameterUtilsTests
-	"${APP_DIR}/runtime/RuntimeJson.cpp"
-	"${APP_DIR}/runtime/RuntimeParameterUtils.cpp"
+	"${APP_DIR}/runtime/support/RuntimeJson.cpp"
+	"${APP_DIR}/runtime/support/RuntimeParameterUtils.cpp"
 	"${CMAKE_CURRENT_SOURCE_DIR}/tests/RuntimeParameterUtilsTests.cpp"
 )
 
 target_include_directories(RuntimeParameterUtilsTests PRIVATE
 	"${APP_DIR}"
 	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/support"
 	"${APP_DIR}/shader"
 )
 
@@ -206,6 +300,121 @@ endif()
 
 add_test(NAME RuntimeParameterUtilsTests COMMAND RuntimeParameterUtilsTests)
 
+add_executable(RuntimeEventTypeTests
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/RuntimeEventTypeTests.cpp"
+)
+
+target_include_directories(RuntimeEventTypeTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/events"
+	"${APP_DIR}/runtime/persistence"
+)
+
+if(MSVC)
+	target_compile_options(RuntimeEventTypeTests PRIVATE /W3)
+endif()
+
+add_test(NAME RuntimeEventTypeTests COMMAND RuntimeEventTypeTests)
+
+add_executable(RuntimeLiveStateTests
+	"${APP_DIR}/runtime/live/RenderStateComposer.cpp"
+	"${APP_DIR}/runtime/live/RuntimeLiveState.cpp"
+	"${APP_DIR}/runtime/support/RuntimeJson.cpp"
+	"${APP_DIR}/runtime/support/RuntimeParameterUtils.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/RuntimeLiveStateTests.cpp"
+)
+
+target_include_directories(RuntimeLiveStateTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/live"
+	"${APP_DIR}/runtime/support"
+	"${APP_DIR}/shader"
+)
+
+if(MSVC)
+	target_compile_options(RuntimeLiveStateTests PRIVATE /W3)
+endif()
+
+add_test(NAME RuntimeLiveStateTests COMMAND RuntimeLiveStateTests)
+
+add_executable(RuntimeStateLayerModelTests
+	"${APP_DIR}/runtime/live/RuntimeStateLayerModel.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/RuntimeStateLayerModelTests.cpp"
+)
+
+target_include_directories(RuntimeStateLayerModelTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/live"
+)
+
+if(MSVC)
+	target_compile_options(RuntimeStateLayerModelTests PRIVATE /W3)
+endif()
+
+add_test(NAME RuntimeStateLayerModelTests COMMAND RuntimeStateLayerModelTests)
+
+add_executable(PersistenceWriterTests
+	"${APP_DIR}/runtime/persistence/PersistenceWriter.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/PersistenceWriterTests.cpp"
+)
+
+target_include_directories(PersistenceWriterTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/persistence"
+)
+
+if(MSVC)
+	target_compile_options(PersistenceWriterTests PRIVATE /W3)
+endif()
+
+add_test(NAME PersistenceWriterTests COMMAND PersistenceWriterTests)
+
+add_executable(RuntimeSubsystemTests
+	"${APP_DIR}/runtime/coordination/RuntimeCoordinator.cpp"
+	"${APP_DIR}/runtime/live/CommittedLiveState.cpp"
+	"${APP_DIR}/runtime/snapshot/RenderSnapshotBuilder.cpp"
+	"${APP_DIR}/runtime/persistence/PersistenceWriter.cpp"
+	"${APP_DIR}/runtime/store/LayerStackStore.cpp"
+	"${APP_DIR}/runtime/store/RuntimeConfigStore.cpp"
+	"${APP_DIR}/runtime/store/RuntimeStore.cpp"
+	"${APP_DIR}/runtime/store/ShaderPackageCatalog.cpp"
+	"${APP_DIR}/runtime/presentation/RuntimeStateJson.cpp"
+	"${APP_DIR}/runtime/presentation/RuntimeStatePresenter.cpp"
+	"${APP_DIR}/runtime/support/RuntimeJson.cpp"
+	"${APP_DIR}/runtime/support/RuntimeParameterUtils.cpp"
+	"${APP_DIR}/runtime/telemetry/HealthTelemetry.cpp"
+	"${APP_DIR}/runtime/telemetry/RuntimeClock.cpp"
+	"${APP_DIR}/shader/ShaderCompiler.cpp"
+	"${APP_DIR}/shader/ShaderPackageRegistry.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/RuntimeSubsystemTests.cpp"
+)
+
+target_include_directories(RuntimeSubsystemTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/platform"
+	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/coordination"
+	"${APP_DIR}/runtime/events"
+	"${APP_DIR}/runtime/live"
+	"${APP_DIR}/runtime/persistence"
+	"${APP_DIR}/runtime/presentation"
+	"${APP_DIR}/runtime/snapshot"
+	"${APP_DIR}/runtime/store"
+	"${APP_DIR}/runtime/support"
+	"${APP_DIR}/runtime/telemetry"
+	"${APP_DIR}/shader"
+)
+
+if(MSVC)
+	target_compile_options(RuntimeSubsystemTests PRIVATE /W3)
+endif()
+
+add_test(NAME RuntimeSubsystemTests COMMAND RuntimeSubsystemTests)
+
 add_executable(Std140BufferTests
 	"${CMAKE_CURRENT_SOURCE_DIR}/tests/Std140BufferTests.cpp"
 )
@@ -222,8 +431,27 @@ endif()
 
 add_test(NAME Std140BufferTests COMMAND Std140BufferTests)
 
+add_executable(RenderCommandQueueTests
+	"${APP_DIR}/gl/threading/RenderCommandQueue.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/RenderCommandQueueTests.cpp"
+)
+
+target_include_directories(RenderCommandQueueTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/gl"
+	"${APP_DIR}/gl/threading"
+	"${APP_DIR}/videoio"
+	"${APP_DIR}/videoio/decklink"
+)
+
+if(MSVC)
+	target_compile_options(RenderCommandQueueTests PRIVATE /W3)
+endif()
+
+add_test(NAME RenderCommandQueueTests COMMAND RenderCommandQueueTests)
+
 add_executable(ShaderPackageRegistryTests
-	"${APP_DIR}/runtime/RuntimeJson.cpp"
+	"${APP_DIR}/runtime/support/RuntimeJson.cpp"
 	"${APP_DIR}/shader/ShaderPackageRegistry.cpp"
 	"${CMAKE_CURRENT_SOURCE_DIR}/tests/ShaderPackageRegistryTests.cpp"
 )
@@ -231,6 +459,7 @@ add_executable(ShaderPackageRegistryTests
 target_include_directories(ShaderPackageRegistryTests PRIVATE
 	"${APP_DIR}"
 	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/support"
 	"${APP_DIR}/shader"
 )
 
@@ -241,7 +470,7 @@ endif()
 add_test(NAME ShaderPackageRegistryTests COMMAND ShaderPackageRegistryTests)
 
 add_executable(ShaderSlangValidationTests
-	"${APP_DIR}/runtime/RuntimeJson.cpp"
+	"${APP_DIR}/runtime/support/RuntimeJson.cpp"
 	"${APP_DIR}/shader/ShaderCompiler.cpp"
 	"${APP_DIR}/shader/ShaderPackageRegistry.cpp"
 	"${CMAKE_CURRENT_SOURCE_DIR}/tests/ShaderSlangValidationTests.cpp"
@@ -251,6 +480,7 @@ target_include_directories(ShaderSlangValidationTests PRIVATE
 	"${APP_DIR}"
 	"${APP_DIR}/platform"
 	"${APP_DIR}/runtime"
+	"${APP_DIR}/runtime/support"
 	"${APP_DIR}/shader"
 )
 
@@ -319,6 +549,89 @@ endif()
 
 add_test(NAME VideoPlayoutSchedulerTests COMMAND VideoPlayoutSchedulerTests)
 
+add_executable(OutputProductionControllerTests
+	"${APP_DIR}/videoio/OutputProductionController.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/OutputProductionControllerTests.cpp"
+)
+
+target_include_directories(OutputProductionControllerTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/videoio"
+)
+
+if(MSVC)
+	target_compile_options(OutputProductionControllerTests PRIVATE /W3)
+endif()
+
+add_test(NAME OutputProductionControllerTests COMMAND OutputProductionControllerTests)
+
+add_executable(RenderOutputQueueTests
+	"${APP_DIR}/videoio/RenderOutputQueue.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/RenderOutputQueueTests.cpp"
+)
+
+target_include_directories(RenderOutputQueueTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/videoio"
+	"${APP_DIR}/videoio/decklink"
+)
+
+if(MSVC)
+	target_compile_options(RenderOutputQueueTests PRIVATE /W3)
+endif()
+
+add_test(NAME RenderOutputQueueTests COMMAND RenderOutputQueueTests)
+
+add_executable(RenderCadenceControllerTests
+	"${APP_DIR}/videoio/RenderCadenceController.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/RenderCadenceControllerTests.cpp"
+)
+
+target_include_directories(RenderCadenceControllerTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/videoio"
+)
+
+if(MSVC)
+	target_compile_options(RenderCadenceControllerTests PRIVATE /W3)
+endif()
+
+add_test(NAME RenderCadenceControllerTests COMMAND RenderCadenceControllerTests)
+
+add_executable(SystemOutputFramePoolTests
+	"${APP_DIR}/videoio/SystemOutputFramePool.cpp"
+	"${APP_DIR}/videoio/VideoIOFormat.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/SystemOutputFramePoolTests.cpp"
+)
+
+target_include_directories(SystemOutputFramePoolTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/videoio"
+	"${APP_DIR}/videoio/decklink"
+)
+
+if(MSVC)
+	target_compile_options(SystemOutputFramePoolTests PRIVATE /W3)
+endif()
+
+add_test(NAME SystemOutputFramePoolTests COMMAND SystemOutputFramePoolTests)
+
+add_executable(VideoBackendLifecycleTests
+	"${APP_DIR}/videoio/VideoBackendLifecycle.cpp"
+	"${CMAKE_CURRENT_SOURCE_DIR}/tests/VideoBackendLifecycleTests.cpp"
+)
+
+target_include_directories(VideoBackendLifecycleTests PRIVATE
+	"${APP_DIR}"
+	"${APP_DIR}/videoio"
+)
+
+if(MSVC)
+	target_compile_options(VideoBackendLifecycleTests PRIVATE /W3)
+endif()
+
+add_test(NAME VideoBackendLifecycleTests COMMAND VideoBackendLifecycleTests)
+
 add_executable(VideoIODeviceFakeTests
 	"${APP_DIR}/videoio/VideoIOFormat.cpp"
 	"${CMAKE_CURRENT_SOURCE_DIR}/tests/VideoIODeviceFakeTests.cpp"

README.md

@@ -49,7 +49,7 @@ Configure and build the native app:
 
 ```powershell
 cmake --preset vs2022-x64-debug
-cmake --build --preset build-debug
+cmake --build --preset build-debug --parallel
 ```
 
 Build the React control UI:
@@ -80,7 +80,7 @@ npm ci
 npm run build
 cd ..
 cmake --preset vs2022-x64-release
-cmake --build --preset build-release
+cmake --build --preset build-release --parallel
 cmake --install build/vs2022-x64-release --config Release --prefix dist/VideoShader
 ```
 
@@ -114,7 +114,7 @@ Compress-Archive -Path dist/VideoShader/* -DestinationPath dist/VideoShader.zip
 Run native tests:
 
 ```powershell
-cmake --build --preset build-debug --target RUN_TESTS
+cmake --build --preset build-debug --target RUN_TESTS --parallel
 ```
 
 Run the UI production build check:
@@ -277,4 +277,4 @@ If `SLANG_ROOT` is not set, the workflow falls back to the repo-local default un
 - Mipmapping for shader-declared textures
 - Anotate included shaders
 - allow 3 vector exposed controls
-- add nearest sampling to the extra shader pass
+- add nearest sampling to the extra shader pass

apps/LoopThroughWithOpenGLCompositing/LoopThroughWithOpenGLCompositing.cpp

@@ -1,47 +1,3 @@
-/* -LICENSE-START-
- ** Copyright (c) 2012 Blackmagic Design
- **  
- ** Permission is hereby granted, free of charge, to any person or organization 
- ** obtaining a copy of the software and accompanying documentation (the 
- ** "Software") to use, reproduce, display, distribute, sub-license, execute, 
- ** and transmit the Software, and to prepare derivative works of the Software, 
- ** and to permit third-parties to whom the Software is furnished to do so, in 
- ** accordance with:
- ** 
- ** (1) if the Software is obtained from Blackmagic Design, the End User License 
- ** Agreement for the Software Development Kit ("EULA") available at 
- ** https://www.blackmagicdesign.com/EULA/DeckLinkSDK; or
- ** 
- ** (2) if the Software is obtained from any third party, such licensing terms 
- ** as notified by that third party,
- ** 
- ** and all subject to the following:
- ** 
- ** (3) the copyright notices in the Software and this entire statement, 
- ** including the above license grant, this restriction and the following 
- ** disclaimer, must be included in all copies of the Software, in whole or in 
- ** part, and all derivative works of the Software, unless such copies or 
- ** derivative works are solely in the form of machine-executable object code 
- ** generated by a source language processor.
- ** 
- ** (4) THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
- ** OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
- ** FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT 
- ** SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE 
- ** FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, 
- ** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
- ** DEALINGS IN THE SOFTWARE.
- ** 
- ** A copy of the Software is available free of charge at 
- ** https://www.blackmagicdesign.com/desktopvideo_sdk under the EULA.
- ** 
- ** -LICENSE-END-
- */
-//
-// LoopThroughWithOpenGLCompositing.cpp
-// LoopThroughWithOpenGLCompositing
-//
-
 #include "stdafx.h"
 #include "resource.h"
 #include "OpenGLComposite.h"
@@ -478,7 +434,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 			}
 
 			// Deselect the current rendering context and delete it
-			wglMakeCurrent(hDC, NULL);
+			wglMakeCurrent(NULL, NULL);
 			wglDeleteContext(hRC);
 
 			// Tell the application to terminate after the window is gone
@@ -530,15 +486,12 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 
 				if (!sInteractiveResize && pOpenGLComposite)
 				{
-					wglMakeCurrent(hDC, hRC);
 					pOpenGLComposite->paintGL(true);
-					wglMakeCurrent( NULL, NULL );
 					RaiseStatusControls(sStatusStrip);
 				}
 			}
 			catch (...)
 			{
-				wglMakeCurrent( NULL, NULL );
 				ShowUnhandledExceptionMessage("Paint failed inside the OpenGL runtime.");
 			}
 			break;

apps/LoopThroughWithOpenGLCompositing/LoopThroughWithOpenGLCompositing.h

@@ -1,47 +1,3 @@
-/* -LICENSE-START-
- ** Copyright (c) 2012 Blackmagic Design
- **  
- ** Permission is hereby granted, free of charge, to any person or organization 
- ** obtaining a copy of the software and accompanying documentation (the 
- ** "Software") to use, reproduce, display, distribute, sub-license, execute, 
- ** and transmit the Software, and to prepare derivative works of the Software, 
- ** and to permit third-parties to whom the Software is furnished to do so, in 
- ** accordance with:
- ** 
- ** (1) if the Software is obtained from Blackmagic Design, the End User License 
- ** Agreement for the Software Development Kit ("EULA") available at 
- ** https://www.blackmagicdesign.com/EULA/DeckLinkSDK; or
- ** 
- ** (2) if the Software is obtained from any third party, such licensing terms 
- ** as notified by that third party,
- ** 
- ** and all subject to the following:
- ** 
- ** (3) the copyright notices in the Software and this entire statement, 
- ** including the above license grant, this restriction and the following 
- ** disclaimer, must be included in all copies of the Software, in whole or in 
- ** part, and all derivative works of the Software, unless such copies or 
- ** derivative works are solely in the form of machine-executable object code 
- ** generated by a source language processor.
- ** 
- ** (4) THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
- ** OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
- ** FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT 
- ** SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE 
- ** FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, 
- ** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
- ** DEALINGS IN THE SOFTWARE.
- ** 
- ** A copy of the Software is available free of charge at 
- ** https://www.blackmagicdesign.com/desktopvideo_sdk under the EULA.
- ** 
- ** -LICENSE-END-
- */
-//
-// LoopThroughWithOpenGLCompositing.h
-// LoopThroughWithOpenGLCompositing
-//
-
 #pragma once
 
 #include "resource.h"

apps/LoopThroughWithOpenGLCompositing/LoopThroughWithOpenGLCompositing.sln

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-    </ClInclude>
-    <ClInclude Include="videoio\decklink\DeckLinkVideoIOFormat.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
-    <ClInclude Include="runtime\RuntimeClock.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
-    <ClInclude Include="videoio\VideoIOFormat.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
-    <ClInclude Include="videoio\VideoIOTypes.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
-    <ClInclude Include="videoio\VideoPlayoutScheduler.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
-  </ItemGroup>
-  <ItemGroup>
-    <Image Include="LoopThroughWithOpenGLCompositing.ico">
-      <Filter>Resource Files</Filter>
-    </Image>
-    <Image Include="small.ico">
-      <Filter>Resource Files</Filter>
-    </Image>
-  </ItemGroup>
-  <ItemGroup>
-    <ResourceCompile Include="LoopThroughWithOpenGLCompositing.rc">
-      <Filter>Resource Files</Filter>
-    </ResourceCompile>
-  </ItemGroup>
-  <ItemGroup>
-    <Midl Include="..\..\include\DeckLinkAPI.idl">
-      <Filter>DeckLink API</Filter>
-    </Midl>
-  </ItemGroup>
-  <ItemGroup>
-    <None Include="video_effect.slang">
-      <Filter>Resource Files</Filter>
-    </None>
-  </ItemGroup>
-</Project>

apps/LoopThroughWithOpenGLCompositing/control/ControlServices.cpp

@@ -0,0 +1,343 @@
+#include "ControlServices.h"
+
+#include "ControlServer.h"
+#include "OscServer.h"
+#include "RuntimeControlBridge.h"
+#include "RuntimeEventDispatcher.h"
+#include "RuntimeStore.h"
+#include <windows.h>
+
+namespace
+{
+constexpr auto kCompatibilityPollFallbackInterval = std::chrono::milliseconds(250);
+}
+
+ControlServices::ControlServices(RuntimeEventDispatcher& runtimeEventDispatcher) :
+	mControlServer(std::make_unique<ControlServer>()),
+	mOscServer(std::make_unique<OscServer>()),
+	mRuntimeEventDispatcher(runtimeEventDispatcher),
+	mPollRunning(false)
+{
+}
+
+ControlServices::~ControlServices()
+{
+	Stop();
+}
+
+bool ControlServices::Start(OpenGLComposite& composite, RuntimeStore& runtimeStore, std::string& error)
+{
+	Stop();
+
+	if (!StartControlServicesBoundary(composite, runtimeStore, *this, *mControlServer, *mOscServer, error))
+	{
+		Stop();
+		return false;
+	}
+
+	return true;
+}
+
+void ControlServices::BeginPolling(RuntimeCoordinator& runtimeCoordinator)
+{
+	StartPolling(runtimeCoordinator);
+}
+
+void ControlServices::Stop()
+{
+	StopPolling();
+
+	if (mOscServer)
+		mOscServer->Stop();
+
+	if (mControlServer)
+		mControlServer->Stop();
+}
+
+void ControlServices::BroadcastState()
+{
+	if (mControlServer)
+		mControlServer->BroadcastState();
+}
+
+void ControlServices::RequestBroadcastState()
+{
+	PublishRuntimeStateBroadcastRequested("control-service-request");
+
+	if (mControlServer)
+		mControlServer->RequestBroadcastState();
+}
+
+bool ControlServices::QueueOscUpdate(const std::string& layerKey, const std::string& parameterKey, const std::string& valueJson, std::string& error)
+{
+	(void)error;
+
+	PendingOscUpdate update;
+	update.layerKey = layerKey;
+	update.parameterKey = parameterKey;
+	update.valueJson = valueJson;
+
+	const std::string routeKey = layerKey + "\n" + parameterKey;
+	{
+		std::lock_guard<std::mutex> lock(mPendingOscMutex);
+		mPendingOscUpdates[routeKey] = std::move(update);
+	}
+	return true;
+}
+
+bool ControlServices::ApplyPendingOscUpdates(std::vector<AppliedOscUpdate>& appliedUpdates, std::string& error)
+{
+	appliedUpdates.clear();
+
+	std::map<std::string, PendingOscUpdate> pending;
+	{
+		std::lock_guard<std::mutex> lock(mPendingOscMutex);
+		if (mPendingOscUpdates.empty())
+			return true;
+		pending.swap(mPendingOscUpdates);
+	}
+
+	for (const auto& entry : pending)
+	{
+		JsonValue targetValue;
+		std::string parseError;
+		if (!ParseJson(entry.second.valueJson, targetValue, parseError))
+		{
+			OutputDebugStringA(("OSC queued value parse failed: " + parseError + "\n").c_str());
+			continue;
+		}
+
+		AppliedOscUpdate appliedUpdate;
+		appliedUpdate.routeKey = entry.first;
+		appliedUpdate.layerKey = entry.second.layerKey;
+		appliedUpdate.parameterKey = entry.second.parameterKey;
+		appliedUpdate.targetValue = targetValue;
+		appliedUpdates.push_back(std::move(appliedUpdate));
+		PublishOscValueReceived(entry.second, entry.first);
+	}
+
+	(void)error;
+	return true;
+}
+
+bool ControlServices::QueueOscCommit(const std::string& routeKey, const std::string& layerKey, const std::string& parameterKey, const JsonValue& value, uint64_t generation, std::string& error)
+{
+	(void)error;
+
+	PendingOscCommit commit;
+	commit.routeKey = routeKey;
+	commit.layerKey = layerKey;
+	commit.parameterKey = parameterKey;
+	commit.value = value;
+	commit.generation = generation;
+
+	{
+		std::lock_guard<std::mutex> lock(mPendingOscCommitMutex);
+		mPendingOscCommits[routeKey] = std::move(commit);
+	}
+	WakePolling();
+	return true;
+}
+
+void ControlServices::ClearOscState()
+{
+	{
+		std::lock_guard<std::mutex> lock(mPendingOscMutex);
+		mPendingOscUpdates.clear();
+	}
+	{
+		std::lock_guard<std::mutex> lock(mPendingOscCommitMutex);
+		mPendingOscCommits.clear();
+	}
+	{
+		std::lock_guard<std::mutex> lock(mCompletedOscCommitMutex);
+		mCompletedOscCommits.clear();
+	}
+}
+
+void ControlServices::ClearOscStateForLayerKey(const std::string& layerKey)
+{
+	{
+		std::lock_guard<std::mutex> lock(mPendingOscMutex);
+		for (auto it = mPendingOscUpdates.begin(); it != mPendingOscUpdates.end();)
+		{
+			if (it->second.layerKey == layerKey)
+				it = mPendingOscUpdates.erase(it);
+			else
+				++it;
+		}
+	}
+	{
+		std::lock_guard<std::mutex> lock(mPendingOscCommitMutex);
+		for (auto it = mPendingOscCommits.begin(); it != mPendingOscCommits.end();)
+		{
+			if (it->second.layerKey == layerKey)
+				it = mPendingOscCommits.erase(it);
+			else
+				++it;
+		}
+	}
+	{
+		std::lock_guard<std::mutex> lock(mCompletedOscCommitMutex);
+		for (auto it = mCompletedOscCommits.begin(); it != mCompletedOscCommits.end();)
+		{
+			if (it->routeKey.rfind(layerKey + "\n", 0) == 0)
+				it = mCompletedOscCommits.erase(it);
+			else
+				++it;
+		}
+	}
+}
+
+void ControlServices::ConsumeCompletedOscCommits(std::vector<CompletedOscCommit>& completedCommits)
+{
+	completedCommits.clear();
+
+	std::lock_guard<std::mutex> lock(mCompletedOscCommitMutex);
+	if (mCompletedOscCommits.empty())
+		return;
+
+	completedCommits.swap(mCompletedOscCommits);
+}
+
+void ControlServices::StartPolling(RuntimeCoordinator& runtimeCoordinator)
+{
+	if (mPollRunning.exchange(true))
+		return;
+
+	mPollThread = std::thread([this, &runtimeCoordinator]() { PollLoop(runtimeCoordinator); });
+}
+
+void ControlServices::StopPolling()
+{
+	if (!mPollRunning.exchange(false))
+		return;
+
+	WakePolling();
+	if (mPollThread.joinable())
+		mPollThread.join();
+}
+
+void ControlServices::PollLoop(RuntimeCoordinator& runtimeCoordinator)
+{
+	while (mPollRunning)
+	{
+		std::map<std::string, PendingOscCommit> pendingCommits;
+		{
+			std::lock_guard<std::mutex> lock(mPendingOscCommitMutex);
+			pendingCommits.swap(mPendingOscCommits);
+		}
+		for (const auto& entry : pendingCommits)
+		{
+			PublishOscCommitRequested(entry.second);
+			const RuntimeCoordinatorResult result = runtimeCoordinator.CommitOscParameterByControlKey(
+				entry.second.layerKey,
+				entry.second.parameterKey,
+				entry.second.value);
+			if (result.accepted)
+			{
+				CompletedOscCommit completedCommit;
+				completedCommit.routeKey = entry.second.routeKey;
+				completedCommit.generation = entry.second.generation;
+				std::lock_guard<std::mutex> lock(mCompletedOscCommitMutex);
+				mCompletedOscCommits.push_back(std::move(completedCommit));
+				PublishOscOverlaySettled(entry.second);
+			}
+			else if (!result.errorMessage.empty())
+			{
+				OutputDebugStringA(("OSC commit failed: " + result.errorMessage + "\n").c_str());
+			}
+		}
+
+		bool registryChanged = false;
+		const RuntimeCoordinatorResult pollResult = runtimeCoordinator.PollRuntimeStoreChanges(registryChanged);
+		if (pollResult.compileStatusChanged && !pollResult.compileStatusSucceeded && !pollResult.compileStatusMessage.empty())
+			OutputDebugStringA(("Runtime poll failed: " + pollResult.compileStatusMessage + "\n").c_str());
+
+		std::unique_lock<std::mutex> wakeLock(mPollWakeMutex);
+		mPollWakeCondition.wait_for(wakeLock, kCompatibilityPollFallbackInterval, [this]() {
+			return !mPollRunning.load() || mPollWakeRequested;
+		});
+		mPollWakeRequested = false;
+	}
+}
+
+void ControlServices::WakePolling()
+{
+	{
+		std::lock_guard<std::mutex> lock(mPollWakeMutex);
+		mPollWakeRequested = true;
+	}
+	mPollWakeCondition.notify_one();
+}
+
+void ControlServices::PublishRuntimeStateBroadcastRequested(const std::string& reason)
+{
+	try
+	{
+		RuntimeStateBroadcastRequestedEvent event;
+		event.reason = reason;
+		if (!mRuntimeEventDispatcher.PublishPayload(event, "ControlServices"))
+			OutputDebugStringA("RuntimeStateBroadcastRequested event publish failed.\n");
+	}
+	catch (...)
+	{
+		OutputDebugStringA("RuntimeStateBroadcastRequested event publish threw.\n");
+	}
+}
+
+void ControlServices::PublishOscValueReceived(const PendingOscUpdate& update, const std::string& routeKey)
+{
+	try
+	{
+		OscValueReceivedEvent event;
+		event.routeKey = routeKey;
+		event.layerKey = update.layerKey;
+		event.parameterKey = update.parameterKey;
+		event.valueJson = update.valueJson;
+		if (!mRuntimeEventDispatcher.PublishPayload(event, "ControlServices"))
+			OutputDebugStringA("OscValueReceived event publish failed.\n");
+	}
+	catch (...)
+	{
+		OutputDebugStringA("OscValueReceived event publish threw.\n");
+	}
+}
+
+void ControlServices::PublishOscCommitRequested(const PendingOscCommit& commit)
+{
+	try
+	{
+		OscCommitRequestedEvent event;
+		event.routeKey = commit.routeKey;
+		event.layerKey = commit.layerKey;
+		event.parameterKey = commit.parameterKey;
+		event.valueJson = SerializeJson(commit.value, false);
+		event.generation = commit.generation;
+		if (!mRuntimeEventDispatcher.PublishPayload(event, "ControlServices"))
+			OutputDebugStringA("OscCommitRequested event publish failed.\n");
+	}
+	catch (...)
+	{
+		OutputDebugStringA("OscCommitRequested event publish threw.\n");
+	}
+}
+
+void ControlServices::PublishOscOverlaySettled(const PendingOscCommit& commit)
+{
+	try
+	{
+		OscOverlayEvent event;
+		event.routeKey = commit.routeKey;
+		event.layerKey = commit.layerKey;
+		event.parameterKey = commit.parameterKey;
+		event.generation = commit.generation;
+		event.settled = true;
+		if (!mRuntimeEventDispatcher.PublishPayload(event, "ControlServices"))
+			OutputDebugStringA("OscOverlaySettled event publish failed.\n");
+	}
+	catch (...)
+	{
+		OutputDebugStringA("OscOverlaySettled event publish threw.\n");
+	}
+}

apps/LoopThroughWithOpenGLCompositing/control/ControlServices.h

@@ -0,0 +1,95 @@
+#pragma once
+
+#include "RuntimeJson.h"
+#include "RuntimeCoordinator.h"
+#include "ShaderTypes.h"
+
+#include <atomic>
+#include <condition_variable>
+#include <chrono>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <thread>
+#include <vector>
+
+class ControlServer;
+class OpenGLComposite;
+class OscServer;
+class RuntimeEventDispatcher;
+class RuntimeStore;
+
+class ControlServices
+{
+public:
+	struct AppliedOscUpdate
+	{
+		std::string routeKey;
+		std::string layerKey;
+		std::string parameterKey;
+		JsonValue targetValue;
+	};
+
+	struct CompletedOscCommit
+	{
+		std::string routeKey;
+		uint64_t generation = 0;
+	};
+
+	explicit ControlServices(RuntimeEventDispatcher& runtimeEventDispatcher);
+	~ControlServices();
+
+	bool Start(OpenGLComposite& composite, RuntimeStore& runtimeStore, std::string& error);
+	void BeginPolling(RuntimeCoordinator& runtimeCoordinator);
+	void Stop();
+	void BroadcastState();
+	void RequestBroadcastState();
+	bool QueueOscUpdate(const std::string& layerKey, const std::string& parameterKey, const std::string& valueJson, std::string& error);
+	bool ApplyPendingOscUpdates(std::vector<AppliedOscUpdate>& appliedUpdates, std::string& error);
+	bool QueueOscCommit(const std::string& routeKey, const std::string& layerKey, const std::string& parameterKey, const JsonValue& value, uint64_t generation, std::string& error);
+	void ClearOscState();
+	void ClearOscStateForLayerKey(const std::string& layerKey);
+	void ConsumeCompletedOscCommits(std::vector<CompletedOscCommit>& completedCommits);
+
+private:
+	struct PendingOscUpdate
+	{
+		std::string layerKey;
+		std::string parameterKey;
+		std::string valueJson;
+	};
+
+	struct PendingOscCommit
+	{
+		std::string routeKey;
+		std::string layerKey;
+		std::string parameterKey;
+		JsonValue value;
+		uint64_t generation = 0;
+	};
+
+	void StartPolling(RuntimeCoordinator& runtimeCoordinator);
+	void StopPolling();
+	void PollLoop(RuntimeCoordinator& runtimeCoordinator);
+	void WakePolling();
+	void PublishRuntimeStateBroadcastRequested(const std::string& reason);
+	void PublishOscValueReceived(const PendingOscUpdate& update, const std::string& routeKey);
+	void PublishOscCommitRequested(const PendingOscCommit& commit);
+	void PublishOscOverlaySettled(const PendingOscCommit& commit);
+
+	std::unique_ptr<ControlServer> mControlServer;
+	std::unique_ptr<OscServer> mOscServer;
+	RuntimeEventDispatcher& mRuntimeEventDispatcher;
+	std::thread mPollThread;
+	std::atomic<bool> mPollRunning;
+	std::mutex mPollWakeMutex;
+	std::condition_variable mPollWakeCondition;
+	bool mPollWakeRequested = false;
+	std::mutex mPendingOscMutex;
+	std::map<std::string, PendingOscUpdate> mPendingOscUpdates;
+	std::mutex mPendingOscCommitMutex;
+	std::map<std::string, PendingOscCommit> mPendingOscCommits;
+	std::mutex mCompletedOscCommitMutex;
+	std::vector<CompletedOscCommit> mCompletedOscCommits;
+};

apps/LoopThroughWithOpenGLCompositing/control/RuntimeControlBridge.cpp

@@ -1,15 +1,15 @@
 #include "RuntimeControlBridge.h"
 
+#include "ControlServices.h"
 #include "ControlServer.h"
 #include "OpenGLComposite.h"
 #include "OscServer.h"
-#include "RuntimeHost.h"
-#include "RuntimeServices.h"
+#include "RuntimeStore.h"
 
-bool StartRuntimeControlServices(
+bool StartControlServicesBoundary(
 	OpenGLComposite& composite,
-	RuntimeHost& runtimeHost,
-	RuntimeServices& runtimeServices,
+	RuntimeStore& runtimeStore,
+	ControlServices& controlServices,
 	ControlServer& controlServer,
 	OscServer& oscServer,
 	std::string& error)
@@ -38,15 +38,16 @@ bool StartRuntimeControlServices(
 		return true;
 	};
 
-	if (!controlServer.Start(runtimeHost.GetUiRoot(), runtimeHost.GetDocsRoot(), runtimeHost.GetServerPort(), callbacks, error))
+	if (!controlServer.Start(runtimeStore.GetRuntimeUiRoot(), runtimeStore.GetRuntimeDocsRoot(), runtimeStore.GetConfiguredControlServerPort(), callbacks, error))
 		return false;
-	runtimeHost.SetServerPort(controlServer.GetPort());
+	runtimeStore.SetBoundControlServerPort(controlServer.GetPort());
 
 	OscServer::Callbacks oscCallbacks;
-	oscCallbacks.updateParameter = [&runtimeServices](const std::string& layerKey, const std::string& parameterKey, const std::string& valueJson, std::string& actionError) {
-		return runtimeServices.QueueOscUpdate(layerKey, parameterKey, valueJson, actionError);
+	oscCallbacks.updateParameter = [&controlServices](const std::string& layerKey, const std::string& parameterKey, const std::string& valueJson, std::string& actionError) {
+		return controlServices.QueueOscUpdate(layerKey, parameterKey, valueJson, actionError);
 	};
-	if (runtimeHost.GetOscPort() > 0 && !oscServer.Start(runtimeHost.GetOscBindAddress(), runtimeHost.GetOscPort(), oscCallbacks, error))
+	if (runtimeStore.GetConfiguredOscPort() > 0 &&
+		!oscServer.Start(runtimeStore.GetConfiguredOscBindAddress(), runtimeStore.GetConfiguredOscPort(), oscCallbacks, error))
 		return false;
 
 	return true;

apps/LoopThroughWithOpenGLCompositing/control/RuntimeControlBridge.h

@@ -3,15 +3,15 @@
 #include <string>
 
 class ControlServer;
+class ControlServices;
 class OpenGLComposite;
 class OscServer;
-class RuntimeHost;
-class RuntimeServices;
+class RuntimeStore;
 
-bool StartRuntimeControlServices(
+bool StartControlServicesBoundary(
 	OpenGLComposite& composite,
-	RuntimeHost& runtimeHost,
-	RuntimeServices& runtimeServices,
+	RuntimeStore& runtimeStore,
+	ControlServices& controlServices,
 	ControlServer& controlServer,
 	OscServer& oscServer,
 	std::string& error);

apps/LoopThroughWithOpenGLCompositing/control/RuntimeServiceLiveBridge.cpp

@@ -0,0 +1,72 @@
+#include "RuntimeServiceLiveBridge.h"
+
+#include "RenderEngine.h"
+#include "RuntimeServices.h"
+
+#include <windows.h>
+
+namespace
+{
+void DrainServiceEvents(RuntimeServices& runtimeServices, RenderEngine& renderEngine)
+{
+	std::vector<RuntimeServices::AppliedOscUpdate> appliedOscUpdates;
+	std::vector<RuntimeServices::CompletedOscCommit> completedOscCommits;
+
+	std::string oscError;
+	if (!runtimeServices.ApplyPendingOscUpdates(appliedOscUpdates, oscError) && !oscError.empty())
+		OutputDebugStringA(("OSC apply failed: " + oscError + "\n").c_str());
+	runtimeServices.ConsumeCompletedOscCommits(completedOscCommits);
+
+	std::vector<RenderEngine::OscOverlayUpdate> overlayUpdates;
+	overlayUpdates.reserve(appliedOscUpdates.size());
+	for (const RuntimeServices::AppliedOscUpdate& update : appliedOscUpdates)
+	{
+		overlayUpdates.push_back({ update.routeKey, update.layerKey, update.parameterKey, update.targetValue });
+	}
+
+	std::vector<RenderEngine::OscOverlayCommitCompletion> overlayCommitCompletions;
+	overlayCommitCompletions.reserve(completedOscCommits.size());
+	for (const RuntimeServices::CompletedOscCommit& completedCommit : completedOscCommits)
+	{
+		overlayCommitCompletions.push_back({ completedCommit.routeKey, completedCommit.generation });
+	}
+
+	renderEngine.UpdateOscOverlayState(overlayUpdates, overlayCommitCompletions);
+}
+
+void QueueServiceCommitRequests(
+	RuntimeServices& runtimeServices,
+	const std::vector<RenderEngine::OscOverlayCommitRequest>& commitRequests)
+{
+	for (const RenderEngine::OscOverlayCommitRequest& commitRequest : commitRequests)
+	{
+		std::string commitError;
+		if (!runtimeServices.QueueOscCommit(
+			commitRequest.routeKey,
+			commitRequest.layerKey,
+			commitRequest.parameterKey,
+			commitRequest.value,
+			commitRequest.generation,
+			commitError) &&
+			!commitError.empty())
+		{
+			OutputDebugStringA(("OSC commit queue failed: " + commitError + "\n").c_str());
+		}
+	}
+}
+}
+
+bool RuntimeServiceLiveBridge::PrepareLiveRenderFrameState(
+	RuntimeServices& runtimeServices,
+	RenderEngine& renderEngine,
+	const RenderFrameInput& input,
+	RenderFrameState& frameState)
+{
+	DrainServiceEvents(runtimeServices, renderEngine);
+
+	std::vector<RenderEngine::OscOverlayCommitRequest> commitRequests;
+	const bool resolved = renderEngine.ResolveRenderFrameState(input, &commitRequests, frameState);
+
+	QueueServiceCommitRequests(runtimeServices, commitRequests);
+	return resolved;
+}

apps/LoopThroughWithOpenGLCompositing/control/RuntimeServiceLiveBridge.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "RenderFrameState.h"
+
+#include <vector>
+
+class RenderEngine;
+class RuntimeServices;
+
+class RuntimeServiceLiveBridge
+{
+public:
+	static bool PrepareLiveRenderFrameState(
+		RuntimeServices& runtimeServices,
+		RenderEngine& renderEngine,
+		const RenderFrameInput& input,
+		RenderFrameState& frameState);
+};

apps/LoopThroughWithOpenGLCompositing/control/RuntimeServices.cpp

@@ -1,18 +1,9 @@
 #include "RuntimeServices.h"
 
-#include "ControlServer.h"
-#include "OscServer.h"
-#include "RuntimeControlBridge.h"
-#include "RuntimeHost.h"
-#include <windows.h>
+#include "RuntimeStore.h"
 
-RuntimeServices::RuntimeServices() :
-	mControlServer(std::make_unique<ControlServer>()),
-	mOscServer(std::make_unique<OscServer>()),
-	mPollRunning(false),
-	mRegistryChanged(false),
-	mReloadRequested(false),
-	mPollFailed(false)
+RuntimeServices::RuntimeServices(RuntimeEventDispatcher& runtimeEventDispatcher) :
+	mControlServices(std::make_unique<ControlServices>(runtimeEventDispatcher))
 {
 }
 
@@ -21,227 +12,75 @@ RuntimeServices::~RuntimeServices()
 	Stop();
 }
 
-bool RuntimeServices::Start(OpenGLComposite& composite, RuntimeHost& runtimeHost, std::string& error)
+bool RuntimeServices::Start(OpenGLComposite& composite, RuntimeStore& runtimeStore, std::string& error)
 {
-	Stop();
-
-	if (!StartRuntimeControlServices(composite, runtimeHost, *this, *mControlServer, *mOscServer, error))
-	{
-		Stop();
-		return false;
-	}
-
-	return true;
+	return mControlServices && mControlServices->Start(composite, runtimeStore, error);
 }
 
-void RuntimeServices::BeginPolling(RuntimeHost& runtimeHost)
+void RuntimeServices::BeginPolling(RuntimeCoordinator& runtimeCoordinator)
 {
-	StartPolling(runtimeHost);
+	if (mControlServices)
+		mControlServices->BeginPolling(runtimeCoordinator);
 }
 
 void RuntimeServices::Stop()
 {
-	StopPolling();
-
-	if (mOscServer)
-		mOscServer->Stop();
-
-	if (mControlServer)
-		mControlServer->Stop();
+	if (mControlServices)
+		mControlServices->Stop();
 }
 
 void RuntimeServices::BroadcastState()
 {
-	if (mControlServer)
-		mControlServer->BroadcastState();
+	if (mControlServices)
+		mControlServices->BroadcastState();
 }
 
 void RuntimeServices::RequestBroadcastState()
 {
-	if (mControlServer)
-		mControlServer->RequestBroadcastState();
+	if (mControlServices)
+		mControlServices->RequestBroadcastState();
 }
 
 bool RuntimeServices::QueueOscUpdate(const std::string& layerKey, const std::string& parameterKey, const std::string& valueJson, std::string& error)
 {
-	(void)error;
-
-	PendingOscUpdate update;
-	update.layerKey = layerKey;
-	update.parameterKey = parameterKey;
-	update.valueJson = valueJson;
-
-	const std::string routeKey = layerKey + "\n" + parameterKey;
-	{
-		std::lock_guard<std::mutex> lock(mPendingOscMutex);
-		mPendingOscUpdates[routeKey] = std::move(update);
-	}
-	return true;
+	return mControlServices && mControlServices->QueueOscUpdate(layerKey, parameterKey, valueJson, error);
 }
 
 bool RuntimeServices::ApplyPendingOscUpdates(std::vector<AppliedOscUpdate>& appliedUpdates, std::string& error)
 {
-	appliedUpdates.clear();
-
-	std::map<std::string, PendingOscUpdate> pending;
+	if (!mControlServices)
 	{
-		std::lock_guard<std::mutex> lock(mPendingOscMutex);
-		if (mPendingOscUpdates.empty())
-			return true;
-		pending.swap(mPendingOscUpdates);
+		appliedUpdates.clear();
+		return true;
 	}
 
-	for (const auto& entry : pending)
-	{
-		JsonValue targetValue;
-		std::string parseError;
-		if (!ParseJson(entry.second.valueJson, targetValue, parseError))
-		{
-			OutputDebugStringA(("OSC queued value parse failed: " + parseError + "\n").c_str());
-			continue;
-		}
-
-		AppliedOscUpdate appliedUpdate;
-		appliedUpdate.routeKey = entry.first;
-		appliedUpdate.layerKey = entry.second.layerKey;
-		appliedUpdate.parameterKey = entry.second.parameterKey;
-		appliedUpdate.targetValue = targetValue;
-		appliedUpdates.push_back(std::move(appliedUpdate));
-	}
-
-	(void)error;
-	return true;
+	return mControlServices->ApplyPendingOscUpdates(appliedUpdates, error);
 }
 
 bool RuntimeServices::QueueOscCommit(const std::string& routeKey, const std::string& layerKey, const std::string& parameterKey, const JsonValue& value, uint64_t generation, std::string& error)
 {
-	(void)error;
-
-	PendingOscCommit commit;
-	commit.routeKey = routeKey;
-	commit.layerKey = layerKey;
-	commit.parameterKey = parameterKey;
-	commit.value = value;
-	commit.generation = generation;
-
-	{
-		std::lock_guard<std::mutex> lock(mPendingOscCommitMutex);
-		mPendingOscCommits[routeKey] = std::move(commit);
-	}
-	return true;
+	return mControlServices && mControlServices->QueueOscCommit(routeKey, layerKey, parameterKey, value, generation, error);
 }
 
 void RuntimeServices::ClearOscState()
 {
-	{
-		std::lock_guard<std::mutex> lock(mPendingOscMutex);
-		mPendingOscUpdates.clear();
-	}
-	{
-		std::lock_guard<std::mutex> lock(mPendingOscCommitMutex);
-		mPendingOscCommits.clear();
-	}
-	{
-		std::lock_guard<std::mutex> lock(mCompletedOscCommitMutex);
-		mCompletedOscCommits.clear();
-	}
+	if (mControlServices)
+		mControlServices->ClearOscState();
+}
+
+void RuntimeServices::ClearOscStateForLayerKey(const std::string& layerKey)
+{
+	if (mControlServices)
+		mControlServices->ClearOscStateForLayerKey(layerKey);
 }
 
 void RuntimeServices::ConsumeCompletedOscCommits(std::vector<CompletedOscCommit>& completedCommits)
 {
-	completedCommits.clear();
-
-	std::lock_guard<std::mutex> lock(mCompletedOscCommitMutex);
-	if (mCompletedOscCommits.empty())
-		return;
-
-	completedCommits.swap(mCompletedOscCommits);
-}
-
-RuntimePollEvents RuntimeServices::ConsumePollEvents()
-{
-	RuntimePollEvents events;
-	events.registryChanged = mRegistryChanged.exchange(false);
-	events.reloadRequested = mReloadRequested.exchange(false);
-	events.failed = mPollFailed.exchange(false);
-
-	if (events.failed)
+	if (!mControlServices)
 	{
-		std::lock_guard<std::mutex> lock(mPollErrorMutex);
-		events.error = mPollError;
+		completedCommits.clear();
+		return;
 	}
 
-	return events;
-}
-
-void RuntimeServices::StartPolling(RuntimeHost& runtimeHost)
-{
-	if (mPollRunning.exchange(true))
-		return;
-
-	mPollThread = std::thread([this, &runtimeHost]() { PollLoop(runtimeHost); });
-}
-
-void RuntimeServices::StopPolling()
-{
-	if (!mPollRunning.exchange(false))
-		return;
-
-	if (mPollThread.joinable())
-		mPollThread.join();
-}
-
-void RuntimeServices::PollLoop(RuntimeHost& runtimeHost)
-{
-	while (mPollRunning)
-	{
-		std::map<std::string, PendingOscCommit> pendingCommits;
-		{
-			std::lock_guard<std::mutex> lock(mPendingOscCommitMutex);
-			pendingCommits.swap(mPendingOscCommits);
-		}
-		for (const auto& entry : pendingCommits)
-		{
-			std::string commitError;
-			if (runtimeHost.UpdateLayerParameterByControlKey(
-				entry.second.layerKey,
-				entry.second.parameterKey,
-				entry.second.value,
-				false,
-				commitError))
-			{
-				CompletedOscCommit completedCommit;
-				completedCommit.routeKey = entry.second.routeKey;
-				completedCommit.generation = entry.second.generation;
-				std::lock_guard<std::mutex> lock(mCompletedOscCommitMutex);
-				mCompletedOscCommits.push_back(std::move(completedCommit));
-			}
-			else if (!commitError.empty())
-			{
-				OutputDebugStringA(("OSC commit failed: " + commitError + "\n").c_str());
-			}
-		}
-
-		bool registryChanged = false;
-		bool reloadRequested = false;
-		std::string runtimeError;
-		if (!runtimeHost.PollFileChanges(registryChanged, reloadRequested, runtimeError))
-		{
-			{
-				std::lock_guard<std::mutex> lock(mPollErrorMutex);
-				mPollError = runtimeError;
-			}
-			mPollFailed = true;
-		}
-		else
-		{
-			if (registryChanged)
-				mRegistryChanged = true;
-			if (reloadRequested)
-				mReloadRequested = true;
-		}
-
-		for (int i = 0; i < 25 && mPollRunning; ++i)
-			Sleep(10);
-	}
+	mControlServices->ConsumeCompletedOscCommits(completedCommits);
 }

apps/LoopThroughWithOpenGLCompositing/control/RuntimeServices.h

@@ -1,50 +1,25 @@
 #pragma once
 
-#include "RuntimeJson.h"
-#include "ShaderTypes.h"
+#include "ControlServices.h"
 
-#include <atomic>
-#include <map>
 #include <memory>
-#include <mutex>
 #include <string>
-#include <thread>
-
-class ControlServer;
 class OpenGLComposite;
-class OscServer;
-class RuntimeHost;
-
-struct RuntimePollEvents
-{
-	bool registryChanged = false;
-	bool reloadRequested = false;
-	bool failed = false;
-	std::string error;
-};
+class RuntimeCoordinator;
+class RuntimeEventDispatcher;
+class RuntimeStore;
 
 class RuntimeServices
 {
 public:
-	struct AppliedOscUpdate
-	{
-		std::string routeKey;
-		std::string layerKey;
-		std::string parameterKey;
-		JsonValue targetValue;
-	};
+	using AppliedOscUpdate = ControlServices::AppliedOscUpdate;
+	using CompletedOscCommit = ControlServices::CompletedOscCommit;
 
-	struct CompletedOscCommit
-	{
-		std::string routeKey;
-		uint64_t generation = 0;
-	};
-
-	RuntimeServices();
+	explicit RuntimeServices(RuntimeEventDispatcher& runtimeEventDispatcher);
 	~RuntimeServices();
 
-	bool Start(OpenGLComposite& composite, RuntimeHost& runtimeHost, std::string& error);
-	void BeginPolling(RuntimeHost& runtimeHost);
+	bool Start(OpenGLComposite& composite, RuntimeStore& runtimeStore, std::string& error);
+	void BeginPolling(RuntimeCoordinator& runtimeCoordinator);
 	void Stop();
 	void BroadcastState();
 	void RequestBroadcastState();
@@ -52,43 +27,9 @@ public:
 	bool ApplyPendingOscUpdates(std::vector<AppliedOscUpdate>& appliedUpdates, std::string& error);
 	bool QueueOscCommit(const std::string& routeKey, const std::string& layerKey, const std::string& parameterKey, const JsonValue& value, uint64_t generation, std::string& error);
 	void ClearOscState();
+	void ClearOscStateForLayerKey(const std::string& layerKey);
 	void ConsumeCompletedOscCommits(std::vector<CompletedOscCommit>& completedCommits);
-	RuntimePollEvents ConsumePollEvents();
 
 private:
-	struct PendingOscUpdate
-	{
-		std::string layerKey;
-		std::string parameterKey;
-		std::string valueJson;
-	};
-
-	struct PendingOscCommit
-	{
-		std::string routeKey;
-		std::string layerKey;
-		std::string parameterKey;
-		JsonValue value;
-		uint64_t generation = 0;
-	};
-
-	void StartPolling(RuntimeHost& runtimeHost);
-	void StopPolling();
-	void PollLoop(RuntimeHost& runtimeHost);
-
-	std::unique_ptr<ControlServer> mControlServer;
-	std::unique_ptr<OscServer> mOscServer;
-	std::thread mPollThread;
-	std::atomic<bool> mPollRunning;
-	std::atomic<bool> mRegistryChanged;
-	std::atomic<bool> mReloadRequested;
-	std::atomic<bool> mPollFailed;
-	std::mutex mPollErrorMutex;
-	std::string mPollError;
-	std::mutex mPendingOscMutex;
-	std::map<std::string, PendingOscUpdate> mPendingOscUpdates;
-	std::mutex mPendingOscCommitMutex;
-	std::map<std::string, PendingOscCommit> mPendingOscCommits;
-	std::mutex mCompletedOscCommitMutex;
-	std::vector<CompletedOscCommit> mCompletedOscCommits;
+	std::unique_ptr<ControlServices> mControlServices;
 };

apps/LoopThroughWithOpenGLCompositing/gl/OpenGLComposite.cpp

@@ -1,800 +0,0 @@
-#include "DeckLinkDisplayMode.h"
-#include "DeckLinkSession.h"
-#include "OpenGLComposite.h"
-#include "GLExtensions.h"
-#include "GlRenderConstants.h"
-#include "OpenGLRenderPass.h"
-#include "OpenGLRenderPipeline.h"
-#include "OpenGLShaderPrograms.h"
-#include "OpenGLVideoIOBridge.h"
-#include "PngScreenshotWriter.h"
-#include "RuntimeParameterUtils.h"
-#include "RuntimeServices.h"
-#include "ShaderBuildQueue.h"
-
-#include <algorithm>
-#include <cctype>
-#include <chrono>
-#include <cmath>
-#include <ctime>
-#include <filesystem>
-#include <iomanip>
-#include <memory>
-#include <set>
-#include <sstream>
-#include <string>
-#include <vector>
-
-namespace
-{
-constexpr auto kOscOverlayCommitDelay = std::chrono::milliseconds(150);
-constexpr double kOscSmoothingReferenceFps = 60.0;
-constexpr double kOscSmoothingMaxStepSeconds = 0.25;
-
-std::string SimplifyOscControlKey(const std::string& text)
-{
-	std::string simplified;
-	for (unsigned char ch : text)
-	{
-		if (std::isalnum(ch))
-			simplified.push_back(static_cast<char>(std::tolower(ch)));
-	}
-	return simplified;
-}
-
-bool MatchesOscControlKey(const std::string& candidate, const std::string& key)
-{
-	return candidate == key || SimplifyOscControlKey(candidate) == SimplifyOscControlKey(key);
-}
-
-double ClampOscAlpha(double value)
-{
-	return (std::max)(0.0, (std::min)(1.0, value));
-}
-
-double ComputeTimeBasedOscAlpha(double smoothing, double deltaSeconds)
-{
-	const double clampedSmoothing = ClampOscAlpha(smoothing);
-	if (clampedSmoothing <= 0.0)
-		return 0.0;
-	if (clampedSmoothing >= 1.0)
-		return 1.0;
-
-	const double clampedDeltaSeconds = (std::max)(0.0, (std::min)(kOscSmoothingMaxStepSeconds, deltaSeconds));
-	if (clampedDeltaSeconds <= 0.0)
-		return 0.0;
-
-	const double frameScale = clampedDeltaSeconds * kOscSmoothingReferenceFps;
-	return ClampOscAlpha(1.0 - std::pow(1.0 - clampedSmoothing, frameScale));
-}
-
-JsonValue BuildOscCommitValue(const ShaderParameterDefinition& definition, const ShaderParameterValue& value)
-{
-	switch (definition.type)
-	{
-	case ShaderParameterType::Boolean:
-		return JsonValue(value.booleanValue);
-	case ShaderParameterType::Enum:
-		return JsonValue(value.enumValue);
-	case ShaderParameterType::Text:
-		return JsonValue(value.textValue);
-	case ShaderParameterType::Trigger:
-	case ShaderParameterType::Float:
-		return JsonValue(value.numberValues.empty() ? 0.0 : value.numberValues.front());
-	case ShaderParameterType::Vec2:
-	case ShaderParameterType::Color:
-	{
-		JsonValue array = JsonValue::MakeArray();
-		for (double number : value.numberValues)
-			array.pushBack(JsonValue(number));
-		return array;
-	}
-	}
-
-	return JsonValue();
-}
-}
-
-OpenGLComposite::OpenGLComposite(HWND hWnd, HDC hDC, HGLRC hRC) :
-	hGLWnd(hWnd), hGLDC(hDC), hGLRC(hRC),
-	mVideoIO(std::make_unique<DeckLinkSession>()),
-	mRenderer(std::make_unique<OpenGLRenderer>()),
-	mUseCommittedLayerStates(false),
-	mScreenshotRequested(false)
-{
-	InitializeCriticalSection(&pMutex);
-	mRuntimeHost = std::make_unique<RuntimeHost>();
-	mRenderPipeline = std::make_unique<OpenGLRenderPipeline>(
-		*mRenderer,
-		*mRuntimeHost,
-		[this]() { renderEffect(); },
-		[this]() { ProcessScreenshotRequest(); },
-		[this]() { paintGL(false); });
-	mVideoIOBridge = std::make_unique<OpenGLVideoIOBridge>(
-		*mVideoIO,
-		*mRenderer,
-		*mRenderPipeline,
-		*mRuntimeHost,
-		pMutex,
-		hGLDC,
-		hGLRC);
-	mRenderPass = std::make_unique<OpenGLRenderPass>(*mRenderer);
-	mShaderPrograms = std::make_unique<OpenGLShaderPrograms>(*mRenderer, *mRuntimeHost);
-	mShaderBuildQueue = std::make_unique<ShaderBuildQueue>(*mRuntimeHost);
-	mRuntimeServices = std::make_unique<RuntimeServices>();
-}
-
-OpenGLComposite::~OpenGLComposite()
-{
-	if (mRuntimeServices)
-		mRuntimeServices->Stop();
-	if (mShaderBuildQueue)
-		mShaderBuildQueue->Stop();
-	mVideoIO->ReleaseResources();
-	mRenderer->DestroyResources();
-
-	DeleteCriticalSection(&pMutex);
-}
-
-bool OpenGLComposite::InitDeckLink()
-{
-	return InitVideoIO();
-}
-
-bool OpenGLComposite::InitVideoIO()
-{
-	VideoFormatSelection		videoModes;
-	std::string						initFailureReason;
-
-	if (mRuntimeHost && mRuntimeHost->GetRepoRoot().empty())
-	{
-		std::string runtimeError;
-		if (!mRuntimeHost->Initialize(runtimeError))
-		{
-			MessageBoxA(NULL, runtimeError.c_str(), "Runtime host failed to initialize", MB_OK);
-			return false;
-		}
-	}
-
-	if (mRuntimeHost)
-	{
-		if (!ResolveConfiguredVideoFormats(
-			mRuntimeHost->GetInputVideoFormat(),
-			mRuntimeHost->GetInputFrameRate(),
-			mRuntimeHost->GetOutputVideoFormat(),
-			mRuntimeHost->GetOutputFrameRate(),
-			videoModes,
-			initFailureReason))
-		{
-			MessageBoxA(NULL, initFailureReason.c_str(), "DeckLink mode configuration error", MB_OK);
-			return false;
-		}
-	}
-
-	if (!mVideoIO->DiscoverDevicesAndModes(videoModes, initFailureReason))
-	{
-		const char* title = initFailureReason == "Please install the Blackmagic DeckLink drivers to use the features of this application."
-			? "This application requires the DeckLink drivers installed."
-			: "DeckLink initialization failed";
-		MessageBoxA(NULL, initFailureReason.c_str(), title, MB_OK | MB_ICONERROR);
-		return false;
-	}
-	const bool outputAlphaRequired = mRuntimeHost && mRuntimeHost->ExternalKeyingEnabled();
-	if (!mVideoIO->SelectPreferredFormats(videoModes, outputAlphaRequired, initFailureReason))
-		goto error;
-
-	if (! CheckOpenGLExtensions())
-	{
-		initFailureReason = "OpenGL extension checks failed.";
-		goto error;
-	}
-
-	if (! InitOpenGLState())
-	{
-		initFailureReason = "OpenGL state initialization failed.";
-		goto error;
-	}
-
-	PublishVideoIOStatus(mVideoIO->OutputModelName().empty()
-		? "DeckLink output device selected."
-		: ("Selected output device: " + mVideoIO->OutputModelName()));
-
-	// Resize window to match output video frame, but scale large formats down by half for viewing.
-	if (mVideoIO->OutputFrameWidth() < 1920)
-		resizeWindow(mVideoIO->OutputFrameWidth(), mVideoIO->OutputFrameHeight());
-	else
-		resizeWindow(mVideoIO->OutputFrameWidth() / 2, mVideoIO->OutputFrameHeight() / 2);
-
-	if (!mVideoIO->ConfigureInput([this](const VideoIOFrame& frame) { mVideoIOBridge->VideoFrameArrived(frame); }, videoModes.input, initFailureReason))
-	{
-		goto error;
-	}
-	if (!mVideoIO->HasInputDevice() && mRuntimeHost)
-	{
-		mRuntimeHost->SetSignalStatus(false, mVideoIO->InputFrameWidth(), mVideoIO->InputFrameHeight(), mVideoIO->InputDisplayModeName());
-	}
-
-	if (!mVideoIO->ConfigureOutput([this](const VideoIOCompletion& completion) { mVideoIOBridge->PlayoutFrameCompleted(completion); }, videoModes.output, mRuntimeHost && mRuntimeHost->ExternalKeyingEnabled(), initFailureReason))
-	{
-		goto error;
-	}
-
-	PublishVideoIOStatus(mVideoIO->StatusMessage());
-
-	return true;
-
-error:
-	if (!initFailureReason.empty())
-		MessageBoxA(NULL, initFailureReason.c_str(), "DeckLink initialization failed", MB_OK | MB_ICONERROR);
-	mVideoIO->ReleaseResources();
-	return false;
-}
-
-void OpenGLComposite::paintGL(bool force)
-{
-	if (!force)
-	{
-		if (IsIconic(hGLWnd))
-			return;
-
-		const unsigned previewFps = mRuntimeHost ? mRuntimeHost->GetPreviewFps() : 30u;
-		if (previewFps == 0)
-			return;
-
-		const auto now = std::chrono::steady_clock::now();
-		const auto minimumInterval = std::chrono::microseconds(1000000 / (previewFps == 0 ? 1u : previewFps));
-		if (mLastPreviewPresentTime != std::chrono::steady_clock::time_point() &&
-			now - mLastPreviewPresentTime < minimumInterval)
-		{
-			return;
-		}
-	}
-
-	if (!TryEnterCriticalSection(&pMutex))
-	{
-		ValidateRect(hGLWnd, NULL);
-		return;
-	}
-
-	mRenderer->PresentToWindow(hGLDC, mVideoIO->OutputFrameWidth(), mVideoIO->OutputFrameHeight());
-	mLastPreviewPresentTime = std::chrono::steady_clock::now();
-	ValidateRect(hGLWnd, NULL);
-	LeaveCriticalSection(&pMutex);
-}
-
-void OpenGLComposite::resizeGL(WORD width, WORD height)
-{
-	// We don't set the project or model matrices here since the window data is copied directly from
-	// an off-screen FBO in paintGL().  Just save the width and height for use in paintGL().
-	mRenderer->ResizeView(width, height);
-}
-
-void OpenGLComposite::resizeWindow(int width, int height)
-{
-	RECT r;
-	if (GetWindowRect(hGLWnd, &r))
-	{
-		SetWindowPos(hGLWnd, HWND_TOP, r.left, r.top, r.left + width, r.top + height, 0);
-	}
-}
-
-void OpenGLComposite::PublishVideoIOStatus(const std::string& statusMessage)
-{
-	if (!mRuntimeHost)
-		return;
-
-	if (!statusMessage.empty())
-		mVideoIO->SetStatusMessage(statusMessage);
-
-	mRuntimeHost->SetVideoIOStatus(
-		"decklink",
-		mVideoIO->OutputModelName(),
-		mVideoIO->SupportsInternalKeying(),
-		mVideoIO->SupportsExternalKeying(),
-		mVideoIO->KeyerInterfaceAvailable(),
-		mRuntimeHost->ExternalKeyingEnabled(),
-		mVideoIO->ExternalKeyingActive(),
-		mVideoIO->StatusMessage());
-}
-
-bool OpenGLComposite::InitOpenGLState()
-{
-	if (! ResolveGLExtensions())
-		return false;
-
-	std::string runtimeError;
-	if (mRuntimeHost->GetRepoRoot().empty() && !mRuntimeHost->Initialize(runtimeError))
-	{
-		MessageBoxA(NULL, runtimeError.c_str(), "Runtime host failed to initialize", MB_OK);
-		return false;
-	}
-
-	if (!mRuntimeServices->Start(*this, *mRuntimeHost, runtimeError))
-	{
-		MessageBoxA(NULL, runtimeError.c_str(), "Runtime control services failed to start", MB_OK);
-		return false;
-	}
-
-	// Prepare the runtime shader program generated from the active shader package.
-	char compilerErrorMessage[1024];
-	if (!mShaderPrograms->CompileDecodeShader(sizeof(compilerErrorMessage), compilerErrorMessage))
-	{
-		MessageBoxA(NULL, compilerErrorMessage, "OpenGL decode shader failed to load or compile", MB_OK);
-		return false;
-	}
-	if (!mShaderPrograms->CompileOutputPackShader(sizeof(compilerErrorMessage), compilerErrorMessage))
-	{
-		MessageBoxA(NULL, compilerErrorMessage, "OpenGL output pack shader failed to load or compile", MB_OK);
-		return false;
-	}
-
-	std::string rendererError;
-	if (!mRenderer->InitializeResources(
-		mVideoIO->InputFrameWidth(),
-		mVideoIO->InputFrameHeight(),
-		mVideoIO->CaptureTextureWidth(),
-		mVideoIO->OutputFrameWidth(),
-		mVideoIO->OutputFrameHeight(),
-		mVideoIO->OutputPackTextureWidth(),
-		rendererError))
-	{
-		MessageBoxA(NULL, rendererError.c_str(), "OpenGL initialization error.", MB_OK);
-		return false;
-	}
-
-	if (!mShaderPrograms->CompileLayerPrograms(mVideoIO->InputFrameWidth(), mVideoIO->InputFrameHeight(), sizeof(compilerErrorMessage), compilerErrorMessage))
-	{
-		MessageBoxA(NULL, compilerErrorMessage, "OpenGL shader failed to load or compile", MB_OK);
-		return false;
-	}
-	mCachedLayerRenderStates = mShaderPrograms->CommittedLayerStates();
-	mUseCommittedLayerStates = false;
-
-	mShaderPrograms->ResetTemporalHistoryState();
-	mShaderPrograms->ResetShaderFeedbackState();
-
-	broadcastRuntimeState();
-	mRuntimeServices->BeginPolling(*mRuntimeHost);
-	return true;
-}
-
-bool OpenGLComposite::Start()
-{
-	return mVideoIO->Start();
-}
-
-bool OpenGLComposite::Stop()
-{
-	if (mRuntimeServices)
-		mRuntimeServices->Stop();
-
-	const bool wasExternalKeyingActive = mVideoIO->ExternalKeyingActive();
-	mVideoIO->Stop();
-	if (wasExternalKeyingActive)
-		PublishVideoIOStatus("External keying has been disabled.");
-
-	return true;
-}
-
-bool OpenGLComposite::ReloadShader(bool preserveFeedbackState)
-{
-	mPreserveFeedbackOnNextShaderBuild = preserveFeedbackState;
-	if (mRuntimeHost)
-	{
-		mRuntimeHost->SetCompileStatus(true, "Shader rebuild queued.");
-		mRuntimeHost->ClearReloadRequest();
-	}
-	RequestShaderBuild();
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::RequestScreenshot(std::string& error)
-{
-	(void)error;
-	mScreenshotRequested.store(true);
-	return true;
-}
-
-void OpenGLComposite::renderEffect()
-{
-	ProcessRuntimePollResults();
-	std::vector<RuntimeServices::AppliedOscUpdate> appliedOscUpdates;
-	std::vector<RuntimeServices::CompletedOscCommit> completedOscCommits;
-	if (mRuntimeHost && mRuntimeServices)
-	{
-		std::string oscError;
-		if (!mRuntimeServices->ApplyPendingOscUpdates(appliedOscUpdates, oscError) && !oscError.empty())
-			OutputDebugStringA(("OSC apply failed: " + oscError + "\n").c_str());
-		mRuntimeServices->ConsumeCompletedOscCommits(completedOscCommits);
-	}
-
-	for (const RuntimeServices::CompletedOscCommit& completedCommit : completedOscCommits)
-	{
-		auto overlayIt = mOscOverlayStates.find(completedCommit.routeKey);
-		if (overlayIt == mOscOverlayStates.end())
-			continue;
-
-		OscOverlayState& overlay = overlayIt->second;
-		if (overlay.commitQueued &&
-			overlay.pendingCommitGeneration == completedCommit.generation &&
-			overlay.generation == completedCommit.generation)
-		{
-			mOscOverlayStates.erase(overlayIt);
-		}
-	}
-
-	std::set<std::string> pendingOscRouteKeys;
-	const auto oscNow = std::chrono::steady_clock::now();
-	for (const RuntimeServices::AppliedOscUpdate& update : appliedOscUpdates)
-	{
-		const std::string routeKey = update.routeKey;
-		auto overlayIt = mOscOverlayStates.find(routeKey);
-		if (overlayIt == mOscOverlayStates.end())
-		{
-			OscOverlayState overlay;
-			overlay.layerKey = update.layerKey;
-			overlay.parameterKey = update.parameterKey;
-			overlay.targetValue = update.targetValue;
-			overlay.lastUpdatedTime = oscNow;
-			overlay.lastAppliedTime = oscNow;
-			overlay.generation = 1;
-			mOscOverlayStates[routeKey] = std::move(overlay);
-		}
-		else
-		{
-			overlayIt->second.targetValue = update.targetValue;
-			overlayIt->second.lastUpdatedTime = oscNow;
-			overlayIt->second.generation += 1;
-			overlayIt->second.commitQueued = false;
-		}
-		pendingOscRouteKeys.insert(routeKey);
-	}
-
-	const auto applyOscOverlays = [&](std::vector<RuntimeRenderState>& states, bool allowCommit)
-	{
-		if (states.empty() || mOscOverlayStates.empty() || !mRuntimeHost)
-			return;
-
-		const double smoothing = ClampOscAlpha(mRuntimeHost->GetOscSmoothing());
-		std::vector<std::string> overlayKeysToRemove;
-		for (auto& item : mOscOverlayStates)
-		{
-			OscOverlayState& overlay = item.second;
-			auto stateIt = std::find_if(states.begin(), states.end(),
-				[&overlay](const RuntimeRenderState& state)
-				{
-					return MatchesOscControlKey(state.layerId, overlay.layerKey) ||
-						MatchesOscControlKey(state.shaderId, overlay.layerKey) ||
-						MatchesOscControlKey(state.shaderName, overlay.layerKey);
-				});
-			if (stateIt == states.end())
-				continue;
-
-			auto definitionIt = std::find_if(stateIt->parameterDefinitions.begin(), stateIt->parameterDefinitions.end(),
-				[&overlay](const ShaderParameterDefinition& definition)
-				{
-					return MatchesOscControlKey(definition.id, overlay.parameterKey) ||
-						MatchesOscControlKey(definition.label, overlay.parameterKey);
-				});
-			if (definitionIt == stateIt->parameterDefinitions.end())
-				continue;
-
-			if (definitionIt->type == ShaderParameterType::Trigger)
-			{
-				if (pendingOscRouteKeys.find(item.first) == pendingOscRouteKeys.end())
-					continue;
-
-				ShaderParameterValue& value = stateIt->parameterValues[definitionIt->id];
-				const double previousCount = value.numberValues.empty() ? 0.0 : value.numberValues[0];
-				const double triggerTime = stateIt->timeSeconds;
-				value.numberValues = { previousCount + 1.0, triggerTime };
-				overlayKeysToRemove.push_back(item.first);
-				continue;
-			}
-
-			ShaderParameterValue targetValue;
-			std::string normalizeError;
-			if (!NormalizeAndValidateParameterValue(*definitionIt, overlay.targetValue, targetValue, normalizeError))
-				continue;
-
-			const bool smoothable =
-				smoothing > 0.0 &&
-				(definitionIt->type == ShaderParameterType::Float ||
-					definitionIt->type == ShaderParameterType::Vec2 ||
-					definitionIt->type == ShaderParameterType::Color);
-			if (!smoothable)
-			{
-				overlay.currentValue = targetValue;
-				overlay.hasCurrentValue = true;
-				stateIt->parameterValues[definitionIt->id] = overlay.currentValue;
-				if (allowCommit &&
-					!overlay.commitQueued &&
-					oscNow - overlay.lastUpdatedTime >= kOscOverlayCommitDelay &&
-					mRuntimeServices)
-				{
-					std::string commitError;
-					if (mRuntimeServices->QueueOscCommit(item.first, overlay.layerKey, overlay.parameterKey, overlay.targetValue, overlay.generation, commitError))
-					{
-						overlay.pendingCommitGeneration = overlay.generation;
-						overlay.commitQueued = true;
-					}
-				}
-				continue;
-			}
-
-			if (!overlay.hasCurrentValue)
-			{
-				overlay.currentValue = DefaultValueForDefinition(*definitionIt);
-				auto currentIt = stateIt->parameterValues.find(definitionIt->id);
-				if (currentIt != stateIt->parameterValues.end())
-					overlay.currentValue = currentIt->second;
-				overlay.hasCurrentValue = true;
-			}
-
-			if (overlay.currentValue.numberValues.size() != targetValue.numberValues.size())
-				overlay.currentValue.numberValues = targetValue.numberValues;
-
-			double smoothingAlpha = smoothing;
-			if (overlay.lastAppliedTime != std::chrono::steady_clock::time_point())
-			{
-				const double deltaSeconds =
-					std::chrono::duration_cast<std::chrono::duration<double>>(oscNow - overlay.lastAppliedTime).count();
-				smoothingAlpha = ComputeTimeBasedOscAlpha(smoothing, deltaSeconds);
-			}
-			overlay.lastAppliedTime = oscNow;
-
-			ShaderParameterValue nextValue = targetValue;
-			bool converged = true;
-			for (std::size_t index = 0; index < targetValue.numberValues.size(); ++index)
-			{
-				const double currentNumber = overlay.currentValue.numberValues[index];
-				const double targetNumber = targetValue.numberValues[index];
-				const double delta = targetNumber - currentNumber;
-				double nextNumber = currentNumber + delta * smoothingAlpha;
-				if (std::fabs(delta) <= 0.0005)
-					nextNumber = targetNumber;
-				else
-					converged = false;
-				nextValue.numberValues[index] = nextNumber;
-			}
-
-			if (converged)
-				nextValue.numberValues = targetValue.numberValues;
-
-			overlay.currentValue = nextValue;
-			overlay.hasCurrentValue = true;
-			stateIt->parameterValues[definitionIt->id] = overlay.currentValue;
-			if (allowCommit &&
-				converged &&
-				!overlay.commitQueued &&
-				oscNow - overlay.lastUpdatedTime >= kOscOverlayCommitDelay &&
-				mRuntimeServices)
-			{
-				std::string commitError;
-				JsonValue committedValue = BuildOscCommitValue(*definitionIt, overlay.currentValue);
-				if (mRuntimeServices->QueueOscCommit(item.first, overlay.layerKey, overlay.parameterKey, committedValue, overlay.generation, commitError))
-				{
-					overlay.pendingCommitGeneration = overlay.generation;
-					overlay.commitQueued = true;
-				}
-			}
-		}
-
-		for (const std::string& overlayKey : overlayKeysToRemove)
-			mOscOverlayStates.erase(overlayKey);
-	};
-
-	const bool hasInputSource = mVideoIO->HasInputSource();
-	std::vector<RuntimeRenderState> layerStates;
-	if (mUseCommittedLayerStates)
-	{
-		layerStates = mShaderPrograms->CommittedLayerStates();
-		applyOscOverlays(layerStates, false);
-		if (mRuntimeHost)
-			mRuntimeHost->RefreshDynamicRenderStateFields(layerStates);
-	}
-	else if (mRuntimeHost)
-	{
-		const unsigned renderWidth = mVideoIO->InputFrameWidth();
-		const unsigned renderHeight = mVideoIO->InputFrameHeight();
-		const uint64_t renderStateVersion = mRuntimeHost->GetRenderStateVersion();
-		const uint64_t parameterStateVersion = mRuntimeHost->GetParameterStateVersion();
-		const bool renderStateCacheValid =
-			!mCachedLayerRenderStates.empty() &&
-			mCachedRenderStateVersion == renderStateVersion &&
-			mCachedRenderStateWidth == renderWidth &&
-			mCachedRenderStateHeight == renderHeight;
-
-		if (renderStateCacheValid)
-		{
-			applyOscOverlays(mCachedLayerRenderStates, true);
-			if (mCachedParameterStateVersion != parameterStateVersion &&
-				mRuntimeHost->TryRefreshCachedLayerStates(mCachedLayerRenderStates))
-			{
-				mCachedParameterStateVersion = parameterStateVersion;
-				applyOscOverlays(mCachedLayerRenderStates, true);
-			}
-			layerStates = mCachedLayerRenderStates;
-			mRuntimeHost->RefreshDynamicRenderStateFields(layerStates);
-		}
-		else
-		{
-			if (mRuntimeHost->TryGetLayerRenderStates(renderWidth, renderHeight, layerStates))
-			{
-				mCachedLayerRenderStates = layerStates;
-				mCachedRenderStateVersion = renderStateVersion;
-				mCachedParameterStateVersion = parameterStateVersion;
-				mCachedRenderStateWidth = renderWidth;
-				mCachedRenderStateHeight = renderHeight;
-				applyOscOverlays(mCachedLayerRenderStates, true);
-				layerStates = mCachedLayerRenderStates;
-			}
-			else
-			{
-				applyOscOverlays(mCachedLayerRenderStates, true);
-				layerStates = mCachedLayerRenderStates;
-				mRuntimeHost->RefreshDynamicRenderStateFields(layerStates);
-			}
-		}
-	}
-	const unsigned historyCap = mRuntimeHost ? mRuntimeHost->GetMaxTemporalHistoryFrames() : 0;
-	mRenderPass->Render(
-		hasInputSource,
-		layerStates,
-		mVideoIO->InputFrameWidth(),
-		mVideoIO->InputFrameHeight(),
-		mVideoIO->CaptureTextureWidth(),
-		mVideoIO->InputPixelFormat(),
-		historyCap,
-		[this](const RuntimeRenderState& state, LayerProgram::TextBinding& textBinding, std::string& error) {
-			return mShaderPrograms->UpdateTextBindingTexture(state, textBinding, error);
-		},
-		[this](const RuntimeRenderState& state, unsigned availableSourceHistoryLength, unsigned availableTemporalHistoryLength, bool feedbackAvailable) {
-			return mShaderPrograms->UpdateGlobalParamsBuffer(state, availableSourceHistoryLength, availableTemporalHistoryLength, feedbackAvailable);
-		});
-}
-
-void OpenGLComposite::ProcessScreenshotRequest()
-{
-	if (!mScreenshotRequested.exchange(false))
-		return;
-
-	const unsigned width = mVideoIO ? mVideoIO->OutputFrameWidth() : 0;
-	const unsigned height = mVideoIO ? mVideoIO->OutputFrameHeight() : 0;
-	if (width == 0 || height == 0)
-		return;
-
-	std::vector<unsigned char> bottomUpPixels(static_cast<std::size_t>(width) * height * 4);
-	std::vector<unsigned char> topDownPixels(bottomUpPixels.size());
-
-	glBindFramebuffer(GL_READ_FRAMEBUFFER, mRenderer->OutputFramebuffer());
-	glReadBuffer(GL_COLOR_ATTACHMENT0);
-	glPixelStorei(GL_PACK_ALIGNMENT, 1);
-	glPixelStorei(GL_PACK_ROW_LENGTH, 0);
-	glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, bottomUpPixels.data());
-	glPixelStorei(GL_PACK_ALIGNMENT, 4);
-
-	const std::size_t rowBytes = static_cast<std::size_t>(width) * 4;
-	for (unsigned y = 0; y < height; ++y)
-	{
-		const unsigned sourceY = height - 1 - y;
-		std::copy(
-			bottomUpPixels.begin() + static_cast<std::ptrdiff_t>(sourceY * rowBytes),
-			bottomUpPixels.begin() + static_cast<std::ptrdiff_t>((sourceY + 1) * rowBytes),
-			topDownPixels.begin() + static_cast<std::ptrdiff_t>(y * rowBytes));
-	}
-
-	try
-	{
-		const std::filesystem::path outputPath = BuildScreenshotPath();
-		std::filesystem::create_directories(outputPath.parent_path());
-		WritePngFileAsync(outputPath, width, height, std::move(topDownPixels));
-	}
-	catch (const std::exception& exception)
-	{
-		OutputDebugStringA((std::string("Screenshot request failed: ") + exception.what() + "\n").c_str());
-	}
-}
-
-std::filesystem::path OpenGLComposite::BuildScreenshotPath() const
-{
-	const std::filesystem::path root = mRuntimeHost && !mRuntimeHost->GetRuntimeRoot().empty()
-		? mRuntimeHost->GetRuntimeRoot()
-		: std::filesystem::current_path();
-
-	const auto now = std::chrono::system_clock::now();
-	const auto milliseconds = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()) % 1000;
-	const std::time_t nowTime = std::chrono::system_clock::to_time_t(now);
-	std::tm localTime = {};
-	localtime_s(&localTime, &nowTime);
-
-	std::ostringstream filename;
-	filename << "video-shader-toys-"
-		<< std::put_time(&localTime, "%Y%m%d-%H%M%S")
-		<< "-" << std::setw(3) << std::setfill('0') << milliseconds.count()
-		<< ".png";
-
-	return root / "screenshots" / filename.str();
-}
-
-bool OpenGLComposite::ProcessRuntimePollResults()
-{
-	if (!mRuntimeHost || !mRuntimeServices)
-		return true;
-
-	const RuntimePollEvents events = mRuntimeServices->ConsumePollEvents();
-	if (events.failed)
-	{
-		mRuntimeHost->SetCompileStatus(false, events.error);
-		broadcastRuntimeState();
-		return false;
-	}
-
-	if (events.registryChanged)
-		broadcastRuntimeState();
-
-	if (!events.reloadRequested)
-	{
-		PreparedShaderBuild readyBuild;
-		if (!mShaderBuildQueue || !mShaderBuildQueue->TryConsumeReadyBuild(readyBuild))
-			return true;
-
-		char compilerErrorMessage[1024] = {};
-		if (!mShaderPrograms->CommitPreparedLayerPrograms(readyBuild, mVideoIO->InputFrameWidth(), mVideoIO->InputFrameHeight(), sizeof(compilerErrorMessage), compilerErrorMessage))
-		{
-			mRuntimeHost->SetCompileStatus(false, compilerErrorMessage);
-			mUseCommittedLayerStates = true;
-			mPreserveFeedbackOnNextShaderBuild = false;
-			broadcastRuntimeState();
-			return false;
-		}
-
-		mUseCommittedLayerStates = false;
-		mCachedLayerRenderStates = mShaderPrograms->CommittedLayerStates();
-		mShaderPrograms->ResetTemporalHistoryState();
-		if (!mPreserveFeedbackOnNextShaderBuild)
-			mShaderPrograms->ResetShaderFeedbackState();
-		mPreserveFeedbackOnNextShaderBuild = false;
-		broadcastRuntimeState();
-		return true;
-	}
-
-	mRuntimeHost->SetCompileStatus(true, "Shader rebuild queued.");
-	mPreserveFeedbackOnNextShaderBuild = false;
-	RequestShaderBuild();
-	broadcastRuntimeState();
-	return true;
-}
-
-void OpenGLComposite::RequestShaderBuild()
-{
-	if (!mShaderBuildQueue || !mVideoIO)
-		return;
-
-	mUseCommittedLayerStates = true;
-	if (mRuntimeHost)
-		mRuntimeHost->ClearReloadRequest();
-	mShaderBuildQueue->RequestBuild(mVideoIO->InputFrameWidth(), mVideoIO->InputFrameHeight());
-}
-
-void OpenGLComposite::broadcastRuntimeState()
-{
-	if (mRuntimeServices)
-		mRuntimeServices->BroadcastState();
-}
-
-void OpenGLComposite::resetTemporalHistoryState()
-{
-	mShaderPrograms->ResetTemporalHistoryState();
-	mShaderPrograms->ResetShaderFeedbackState();
-}
-
-bool OpenGLComposite::CheckOpenGLExtensions()
-{
-	return true;
-}
-
-////////////////////////////////////////////
-
-

apps/LoopThroughWithOpenGLCompositing/gl/OpenGLCompositeRuntimeControls.cpp

@@ -1,156 +0,0 @@
-#include "OpenGLComposite.h"
-#include "RuntimeServices.h"
-
-std::string OpenGLComposite::GetRuntimeStateJson() const
-{
-	return mRuntimeHost ? mRuntimeHost->BuildStateJson() : "{}";
-}
-
-unsigned short OpenGLComposite::GetControlServerPort() const
-{
-	return mRuntimeHost ? mRuntimeHost->GetServerPort() : 0;
-}
-
-unsigned short OpenGLComposite::GetOscPort() const
-{
-	return mRuntimeHost ? mRuntimeHost->GetOscPort() : 0;
-}
-
-std::string OpenGLComposite::GetOscBindAddress() const
-{
-	return mRuntimeHost ? mRuntimeHost->GetOscBindAddress() : "127.0.0.1";
-}
-
-std::string OpenGLComposite::GetControlUrl() const
-{
-	return "http://127.0.0.1:" + std::to_string(GetControlServerPort()) + "/";
-}
-
-std::string OpenGLComposite::GetDocsUrl() const
-{
-	return "http://127.0.0.1:" + std::to_string(GetControlServerPort()) + "/docs";
-}
-
-std::string OpenGLComposite::GetOscAddress() const
-{
-	return "udp://" + GetOscBindAddress() + ":" + std::to_string(GetOscPort()) + " /VideoShaderToys/{Layer}/{Parameter}";
-}
-
-bool OpenGLComposite::AddLayer(const std::string& shaderId, std::string& error)
-{
-	if (!mRuntimeHost->AddLayer(shaderId, error))
-		return false;
-
-	ReloadShader(true);
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::RemoveLayer(const std::string& layerId, std::string& error)
-{
-	if (!mRuntimeHost->RemoveLayer(layerId, error))
-		return false;
-
-	ReloadShader(true);
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::MoveLayer(const std::string& layerId, int direction, std::string& error)
-{
-	if (!mRuntimeHost->MoveLayer(layerId, direction, error))
-		return false;
-
-	ReloadShader(true);
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::MoveLayerToIndex(const std::string& layerId, std::size_t targetIndex, std::string& error)
-{
-	if (!mRuntimeHost->MoveLayerToIndex(layerId, targetIndex, error))
-		return false;
-
-	ReloadShader(true);
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::SetLayerBypass(const std::string& layerId, bool bypassed, std::string& error)
-{
-	if (!mRuntimeHost->SetLayerBypass(layerId, bypassed, error))
-		return false;
-
-	ReloadShader();
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::SetLayerShader(const std::string& layerId, const std::string& shaderId, std::string& error)
-{
-	if (!mRuntimeHost->SetLayerShader(layerId, shaderId, error))
-		return false;
-
-	ReloadShader();
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::UpdateLayerParameterJson(const std::string& layerId, const std::string& parameterId, const std::string& valueJson, std::string& error)
-{
-	JsonValue parsedValue;
-	if (!ParseJson(valueJson, parsedValue, error))
-		return false;
-
-	if (!mRuntimeHost->UpdateLayerParameter(layerId, parameterId, parsedValue, error))
-		return false;
-
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::UpdateLayerParameterByControlKeyJson(const std::string& layerKey, const std::string& parameterKey, const std::string& valueJson, std::string& error)
-{
-	JsonValue parsedValue;
-	if (!ParseJson(valueJson, parsedValue, error))
-		return false;
-
-	if (!mRuntimeHost->UpdateLayerParameterByControlKey(layerKey, parameterKey, parsedValue, error))
-		return false;
-
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::ResetLayerParameters(const std::string& layerId, std::string& error)
-{
-	if (!mRuntimeHost->ResetLayerParameters(layerId, error))
-		return false;
-
-	mOscOverlayStates.clear();
-	if (mRuntimeServices)
-		mRuntimeServices->ClearOscState();
-	resetTemporalHistoryState();
-
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::SaveStackPreset(const std::string& presetName, std::string& error)
-{
-	if (!mRuntimeHost->SaveStackPreset(presetName, error))
-		return false;
-
-	broadcastRuntimeState();
-	return true;
-}
-
-bool OpenGLComposite::LoadStackPreset(const std::string& presetName, std::string& error)
-{
-	if (!mRuntimeHost->LoadStackPreset(presetName, error))
-		return false;
-
-	ReloadShader();
-	broadcastRuntimeState();
-	return true;
-}

apps/LoopThroughWithOpenGLCompositing/gl/RenderEngine.cpp

@@ -0,0 +1,668 @@
+#include "RenderEngine.h"
+
+#include <gl/gl.h>
+
+#include <algorithm>
+#include <cstring>
+#include <sstream>
+
+RenderEngine::RenderEngine(
+	RuntimeSnapshotProvider& runtimeSnapshotProvider,
+	HealthTelemetry& healthTelemetry,
+	HDC hdc,
+	HGLRC hglrc,
+	RenderEffectCallback renderEffect,
+	ScreenshotCallback screenshotReady,
+	PreviewPaintCallback previewPaint) :
+	mRenderer(),
+	mRenderPass(mRenderer),
+	mRenderPipeline(mRenderer, runtimeSnapshotProvider, healthTelemetry, std::move(renderEffect), std::move(screenshotReady), std::move(previewPaint)),
+	mShaderPrograms(mRenderer, runtimeSnapshotProvider),
+	mHealthTelemetry(healthTelemetry),
+	mHdc(hdc),
+	mHglrc(hglrc),
+	mFrameStateResolver(runtimeSnapshotProvider)
+{
+}
+
+RenderEngine::~RenderEngine()
+{
+	StopRenderThread();
+	if (!mResourcesDestroyed)
+	{
+		mRenderer.DestroyResources();
+		mResourcesDestroyed = true;
+	}
+}
+
+bool RenderEngine::StartRenderThread()
+{
+	if (mRenderThreadRunning)
+		return true;
+
+	{
+		std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+		mRenderThreadStopping = false;
+	}
+
+	std::promise<bool> ready;
+	std::future<bool> readyResult = ready.get_future();
+	mRenderThread = std::thread(&RenderEngine::RenderThreadMain, this, std::move(ready));
+	if (!readyResult.get())
+	{
+		if (mRenderThread.joinable())
+			mRenderThread.join();
+		return false;
+	}
+
+	return true;
+}
+
+void RenderEngine::StopRenderThread()
+{
+	if (mRenderThreadRunning)
+	{
+		InvokeOnRenderThread([this]() {
+			if (!mResourcesDestroyed)
+			{
+				mRenderer.DestroyResources();
+				mResourcesDestroyed = true;
+			}
+		});
+	}
+
+	{
+		std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+		mRenderThreadStopping = true;
+	}
+	mRenderThreadCondition.notify_one();
+
+	if (mRenderThread.joinable())
+		mRenderThread.join();
+}
+
+void RenderEngine::RenderThreadMain(std::promise<bool> ready)
+{
+	mRenderThreadId = GetCurrentThreadId();
+	if (!wglMakeCurrent(mHdc, mHglrc))
+	{
+		mRenderThreadId = 0;
+		ready.set_value(false);
+		return;
+	}
+
+	mRenderThreadRunning = true;
+	ready.set_value(true);
+
+	for (;;)
+	{
+		std::function<void()> task;
+		{
+			std::unique_lock<std::mutex> lock(mRenderThreadMutex);
+			mRenderThreadCondition.wait(lock, [this]() {
+				return mRenderThreadStopping || !mRenderThreadTasks.empty();
+			});
+
+			if (mRenderThreadStopping && mRenderThreadTasks.empty())
+				break;
+
+			task = std::move(mRenderThreadTasks.front());
+			mRenderThreadTasks.pop();
+		}
+
+		try
+		{
+			task();
+		}
+		catch (...)
+		{
+			OutputDebugStringA("Render thread task failed with an unhandled exception.\n");
+		}
+	}
+
+	wglMakeCurrent(NULL, NULL);
+	mRenderThreadRunning = false;
+	mRenderThreadId = 0;
+}
+
+void RenderEngine::ReportRenderThreadRequestFailure(const char* operationName, const char* reason)
+{
+	std::ostringstream message;
+	message << "Render thread request failed";
+	if (operationName && operationName[0] != '\0')
+		message << " [" << operationName << "]";
+	if (reason && reason[0] != '\0')
+		message << ": " << reason;
+	message << ".\n";
+	OutputDebugStringA(message.str().c_str());
+}
+
+bool RenderEngine::IsRenderThreadAccessExpected() const
+{
+	return !mRenderThreadRunning || GetCurrentThreadId() == mRenderThreadId;
+}
+
+void RenderEngine::ReportWrongThreadRenderAccess(const char* operationName) const
+{
+	if (IsRenderThreadAccessExpected())
+		return;
+
+	std::ostringstream message;
+	message << "Wrong-thread render access detected";
+	if (operationName && operationName[0] != '\0')
+		message << " [" << operationName << "]";
+	message << ".\n";
+	OutputDebugStringA(message.str().c_str());
+}
+
+bool RenderEngine::CompileDecodeShader(int errorMessageSize, char* errorMessage)
+{
+	return InvokeOnRenderThread([this, errorMessageSize, errorMessage]() {
+		return mShaderPrograms.CompileDecodeShader(errorMessageSize, errorMessage);
+	});
+}
+
+bool RenderEngine::CompileOutputPackShader(int errorMessageSize, char* errorMessage)
+{
+	return InvokeOnRenderThread([this, errorMessageSize, errorMessage]() {
+		return mShaderPrograms.CompileOutputPackShader(errorMessageSize, errorMessage);
+	});
+}
+
+bool RenderEngine::InitializeResources(
+	unsigned inputFrameWidth,
+	unsigned inputFrameHeight,
+	unsigned captureTextureWidth,
+	unsigned outputFrameWidth,
+	unsigned outputFrameHeight,
+	unsigned outputPackTextureWidth,
+	std::string& error)
+{
+	return InvokeOnRenderThread([this, inputFrameWidth, inputFrameHeight, captureTextureWidth, outputFrameWidth, outputFrameHeight, outputPackTextureWidth, &error]() {
+		return mRenderer.InitializeResources(
+			inputFrameWidth,
+			inputFrameHeight,
+			captureTextureWidth,
+			outputFrameWidth,
+			outputFrameHeight,
+			outputPackTextureWidth,
+			error);
+	});
+}
+
+bool RenderEngine::CompileLayerPrograms(unsigned inputFrameWidth, unsigned inputFrameHeight, int errorMessageSize, char* errorMessage)
+{
+	return InvokeOnRenderThread([this, inputFrameWidth, inputFrameHeight, errorMessageSize, errorMessage]() {
+		return mShaderPrograms.CompileLayerPrograms(inputFrameWidth, inputFrameHeight, errorMessageSize, errorMessage);
+	});
+}
+
+bool RenderEngine::CommitPreparedLayerPrograms(const PreparedShaderBuild& preparedBuild, unsigned inputFrameWidth, unsigned inputFrameHeight, int errorMessageSize, char* errorMessage)
+{
+	return InvokeOnRenderThread([this, &preparedBuild, inputFrameWidth, inputFrameHeight, errorMessageSize, errorMessage]() {
+		return mShaderPrograms.CommitPreparedLayerPrograms(preparedBuild, inputFrameWidth, inputFrameHeight, errorMessageSize, errorMessage);
+	});
+}
+
+bool RenderEngine::ApplyPreparedShaderBuild(
+	const PreparedShaderBuild& preparedBuild,
+	unsigned inputFrameWidth,
+	unsigned inputFrameHeight,
+	bool preserveFeedbackState,
+	int errorMessageSize,
+	char* errorMessage)
+{
+	if (!CommitPreparedLayerPrograms(preparedBuild, inputFrameWidth, inputFrameHeight, errorMessageSize, errorMessage))
+		return false;
+
+	mFrameStateResolver.StoreCommittedSnapshot(preparedBuild.renderSnapshot, mShaderPrograms.CommittedLayerStates());
+	ResetTemporalHistoryState();
+	if (!preserveFeedbackState)
+		ResetShaderFeedbackState();
+	return true;
+}
+
+void RenderEngine::ResetTemporalHistoryState()
+{
+	InvokeOnRenderThread([this]() {
+		mRenderCommandQueue.RequestRenderReset(RenderCommandResetScope::TemporalHistoryOnly);
+		ProcessRenderResetCommandsOnRenderThread();
+	});
+}
+
+void RenderEngine::ResetShaderFeedbackState()
+{
+	InvokeOnRenderThread([this]() {
+		mRenderCommandQueue.RequestRenderReset(RenderCommandResetScope::ShaderFeedbackOnly);
+		ProcessRenderResetCommandsOnRenderThread();
+	});
+}
+
+void RenderEngine::ApplyRuntimeCoordinatorRenderReset(RuntimeCoordinatorRenderResetScope resetScope)
+{
+	InvokeOnRenderThread([this, resetScope]() {
+		switch (resetScope)
+		{
+		case RuntimeCoordinatorRenderResetScope::TemporalHistoryOnly:
+			mRenderCommandQueue.RequestRenderReset(RenderCommandResetScope::TemporalHistoryOnly);
+			ProcessRenderResetCommandsOnRenderThread();
+			break;
+		case RuntimeCoordinatorRenderResetScope::TemporalHistoryAndFeedback:
+			mRenderCommandQueue.RequestRenderReset(RenderCommandResetScope::TemporalHistoryAndFeedback);
+			ProcessRenderResetCommandsOnRenderThread();
+			break;
+		case RuntimeCoordinatorRenderResetScope::None:
+		default:
+			break;
+		}
+	});
+}
+
+void RenderEngine::ResetTemporalHistoryStateOnRenderThread()
+{
+	ReportWrongThreadRenderAccess("reset-temporal-history");
+	mShaderPrograms.ResetTemporalHistoryState();
+}
+
+void RenderEngine::ResetShaderFeedbackStateOnRenderThread()
+{
+	ReportWrongThreadRenderAccess("reset-shader-feedback");
+	mShaderPrograms.ResetShaderFeedbackState();
+}
+
+void RenderEngine::ApplyRenderResetOnRenderThread(RenderCommandResetScope resetScope)
+{
+	switch (resetScope)
+	{
+	case RenderCommandResetScope::ShaderFeedbackOnly:
+		ResetShaderFeedbackStateOnRenderThread();
+		break;
+	case RenderCommandResetScope::TemporalHistoryOnly:
+		ResetTemporalHistoryStateOnRenderThread();
+		break;
+	case RenderCommandResetScope::TemporalHistoryAndFeedback:
+		ResetTemporalHistoryStateOnRenderThread();
+		ResetShaderFeedbackStateOnRenderThread();
+		break;
+	case RenderCommandResetScope::None:
+	default:
+		break;
+	}
+}
+
+void RenderEngine::ProcessRenderResetCommandsOnRenderThread()
+{
+	RenderCommandResetScope resetScope = RenderCommandResetScope::None;
+	while (mRenderCommandQueue.TryTakeRenderReset(resetScope))
+		ApplyRenderResetOnRenderThread(resetScope);
+}
+
+void RenderEngine::EnqueuePreviewPresentWake()
+{
+	if (!mRenderThreadRunning)
+		return;
+
+	bool shouldNotify = false;
+	{
+		std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+		if (!mRenderThreadStopping && !mPreviewPresentWakePending)
+		{
+			mPreviewPresentWakePending = true;
+			mRenderThreadTasks.push([this]() {
+				{
+					std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+					mPreviewPresentWakePending = false;
+				}
+				ProcessPreviewPresentCommandsOnRenderThread();
+			});
+			shouldNotify = true;
+		}
+	}
+
+	if (shouldNotify)
+		mRenderThreadCondition.notify_one();
+}
+
+void RenderEngine::ProcessPreviewPresentCommandsOnRenderThread()
+{
+	RenderPreviewPresentRequest request;
+	if (mRenderCommandQueue.TryTakePreviewPresent(request))
+		PresentPreviewOnRenderThread(request.outputFrameWidth, request.outputFrameHeight);
+}
+
+void RenderEngine::EnqueueInputUploadWake()
+{
+	if (!mRenderThreadRunning || GetCurrentThreadId() == mRenderThreadId)
+		return;
+
+	bool shouldNotify = false;
+	{
+		std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+		if (!mRenderThreadStopping && !mInputUploadWakePending)
+		{
+			mInputUploadWakePending = true;
+			mRenderThreadTasks.push([this]() {
+				{
+					std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+					mInputUploadWakePending = false;
+				}
+				ProcessInputUploadCommandsOnRenderThread();
+			});
+			shouldNotify = true;
+		}
+	}
+
+	if (shouldNotify)
+		mRenderThreadCondition.notify_one();
+}
+
+void RenderEngine::ProcessInputUploadCommandsOnRenderThread()
+{
+	RenderInputUploadRequest request;
+	while (mRenderCommandQueue.TryTakeInputUpload(request))
+	{
+		if (request.ownedBytes.empty())
+			continue;
+
+		request.inputFrame.bytes = request.ownedBytes.data();
+		UploadInputFrameOnRenderThread(request.inputFrame, request.videoState);
+	}
+}
+
+void RenderEngine::EnqueueScreenshotCaptureWake()
+{
+	if (!mRenderThreadRunning || GetCurrentThreadId() == mRenderThreadId)
+		return;
+
+	bool shouldNotify = false;
+	{
+		std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+		if (!mRenderThreadStopping && !mScreenshotCaptureWakePending)
+		{
+			mScreenshotCaptureWakePending = true;
+			mRenderThreadTasks.push([this]() {
+				{
+					std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+					mScreenshotCaptureWakePending = false;
+				}
+				ProcessScreenshotCaptureCommandsOnRenderThread();
+			});
+			shouldNotify = true;
+		}
+	}
+
+	if (shouldNotify)
+		mRenderThreadCondition.notify_one();
+}
+
+void RenderEngine::ProcessScreenshotCaptureCommandsOnRenderThread()
+{
+	RenderScreenshotCaptureRequest request;
+	ScreenshotCaptureCallback completion;
+	{
+		std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+		completion = mScreenshotCaptureCompletion;
+	}
+
+	while (mRenderCommandQueue.TryTakeScreenshotCapture(request))
+	{
+		if (!completion)
+			continue;
+
+		std::vector<unsigned char> topDownPixels;
+		if (CaptureOutputFrameRgbaTopDownOnRenderThread(request.width, request.height, topDownPixels))
+			completion(request.width, request.height, std::move(topDownPixels));
+	}
+}
+
+void RenderEngine::ClearOscOverlayState()
+{
+	InvokeOnRenderThread([this]() {
+		mRuntimeLiveState.Clear();
+	});
+}
+
+void RenderEngine::ClearOscOverlayStateForLayerKey(const std::string& layerKey)
+{
+	InvokeOnRenderThread([this, layerKey]() {
+		mRuntimeLiveState.ClearForLayerKey(layerKey);
+	});
+}
+
+void RenderEngine::UpdateOscOverlayState(
+	const std::vector<OscOverlayUpdate>& updates,
+	const std::vector<OscOverlayCommitCompletion>& completedCommits)
+{
+	std::vector<RuntimeLiveOscCommitCompletion> liveCompletions;
+	liveCompletions.reserve(completedCommits.size());
+	for (const OscOverlayCommitCompletion& completedCommit : completedCommits)
+		liveCompletions.push_back({ completedCommit.routeKey, completedCommit.generation });
+	mRuntimeLiveState.ApplyOscCommitCompletions(liveCompletions);
+
+	std::vector<RuntimeLiveOscUpdate> liveUpdates;
+	liveUpdates.reserve(updates.size());
+	for (const OscOverlayUpdate& update : updates)
+		liveUpdates.push_back({ update.routeKey, update.layerKey, update.parameterKey, update.targetValue });
+	mRuntimeLiveState.ApplyOscUpdates(liveUpdates);
+}
+
+void RenderEngine::ResizeView(int width, int height)
+{
+	InvokeOnRenderThread([this, width, height]() {
+		mRenderer.ResizeView(width, height);
+	});
+}
+
+bool RenderEngine::TryPresentPreview(bool force, unsigned previewFps, unsigned outputFrameWidth, unsigned outputFrameHeight)
+{
+	if (!force)
+	{
+		if (previewFps == 0)
+			return false;
+
+		const auto now = std::chrono::steady_clock::now();
+		const auto minimumInterval = std::chrono::microseconds(1000000 / (previewFps == 0 ? 1u : previewFps));
+		if (mLastPreviewPresentTime != std::chrono::steady_clock::time_point() &&
+			now - mLastPreviewPresentTime < minimumInterval)
+		{
+			return false;
+		}
+	}
+
+	if (mRenderThreadRunning)
+	{
+		mRenderCommandQueue.RequestPreviewPresent({ outputFrameWidth, outputFrameHeight });
+		EnqueuePreviewPresentWake();
+		return true;
+	}
+
+	ReportRenderThreadRequestFailure("preview-present", "render thread is not running");
+	return false;
+}
+
+bool RenderEngine::PresentPreviewOnRenderThread(unsigned outputFrameWidth, unsigned outputFrameHeight)
+{
+	ReportWrongThreadRenderAccess("preview-present");
+	mRenderer.PresentToWindow(mHdc, outputFrameWidth, outputFrameHeight);
+	mLastPreviewPresentTime = std::chrono::steady_clock::now();
+	return true;
+}
+
+bool RenderEngine::RequestScreenshotCapture(unsigned width, unsigned height, ScreenshotCaptureCallback completion)
+{
+	if (width == 0 || height == 0 || !completion)
+		return false;
+	if (!mRenderThreadRunning)
+		return false;
+
+	{
+		std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+		mScreenshotCaptureCompletion = std::move(completion);
+	}
+	mRenderCommandQueue.RequestScreenshotCapture({ width, height });
+	EnqueueScreenshotCaptureWake();
+	return true;
+}
+
+bool RenderEngine::QueueInputFrame(const VideoIOFrame& inputFrame, const VideoIOState& videoState)
+{
+	if (inputFrame.hasNoInputSource || inputFrame.bytes == nullptr)
+		return true;
+	if (inputFrame.rowBytes <= 0 || inputFrame.height == 0)
+		return false;
+
+	const std::size_t byteCount = static_cast<std::size_t>(inputFrame.rowBytes) * inputFrame.height;
+	RenderInputUploadRequest request;
+	request.inputFrame = inputFrame;
+	request.videoState = videoState;
+	request.ownedBytes.resize(byteCount);
+	std::memcpy(request.ownedBytes.data(), inputFrame.bytes, byteCount);
+	request.inputFrame.bytes = nullptr;
+
+	mRenderCommandQueue.RequestInputUpload(request);
+	EnqueueInputUploadWake();
+	return true;
+}
+
+bool RenderEngine::UploadInputFrameOnRenderThread(const VideoIOFrame& inputFrame, const VideoIOState& videoState)
+{
+	ReportWrongThreadRenderAccess("input-upload");
+	const long textureSize = inputFrame.rowBytes * static_cast<long>(inputFrame.height);
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+	glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+	glBindBuffer(GL_PIXEL_UNPACK_BUFFER, mRenderer.TextureUploadBuffer());
+	glBufferData(GL_PIXEL_UNPACK_BUFFER, textureSize, inputFrame.bytes, GL_DYNAMIC_DRAW);
+	glBindTexture(GL_TEXTURE_2D, mRenderer.CaptureTexture());
+	if (inputFrame.pixelFormat == VideoIOPixelFormat::V210)
+		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, videoState.captureTextureWidth, videoState.inputFrameSize.height, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+	else
+		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, videoState.captureTextureWidth, videoState.inputFrameSize.height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL);
+	glBindTexture(GL_TEXTURE_2D, 0);
+	glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
+
+	return true;
+}
+
+bool RenderEngine::RequestOutputFrame(const RenderPipelineFrameContext& context, VideoIOOutputFrame& outputFrame)
+{
+	if (mRenderThreadRunning)
+	{
+		const auto queuedAt = std::chrono::steady_clock::now();
+		return TryInvokeOnRenderThread("output-render", [this, &context, &outputFrame, queuedAt]() {
+			const auto startedAt = std::chrono::steady_clock::now();
+			const double queueWaitMilliseconds = std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(startedAt - queuedAt).count();
+			mHealthTelemetry.TryRecordOutputRenderQueueWait(queueWaitMilliseconds);
+			mRenderCommandQueue.RequestOutputFrame({ context.videoState, context.completion });
+			RenderOutputFrameRequest request;
+			return mRenderCommandQueue.TryTakeOutputFrame(request) &&
+				RenderOutputFrameOnRenderThread({ request.videoState, request.completion }, outputFrame);
+		});
+	}
+
+	ReportRenderThreadRequestFailure("output-render", "render thread is not running");
+	return false;
+}
+
+bool RenderEngine::RenderOutputFrameOnRenderThread(const RenderPipelineFrameContext& context, VideoIOOutputFrame& outputFrame)
+{
+	ReportWrongThreadRenderAccess("output-render");
+	ProcessRenderResetCommandsOnRenderThread();
+	ProcessInputUploadCommandsOnRenderThread();
+	return mRenderPipeline.RenderFrame(context, outputFrame);
+}
+
+bool RenderEngine::ResolveRenderFrameState(
+	const RenderFrameInput& input,
+	std::vector<OscOverlayCommitRequest>* commitRequests,
+	RenderFrameState& frameState)
+{
+	std::vector<RuntimeLiveOscCommitRequest> liveCommitRequests;
+	const bool resolved = mFrameStateResolver.Resolve(
+		input,
+		mShaderPrograms.CommittedLayerStates(),
+		mRuntimeLiveState,
+		commitRequests ? &liveCommitRequests : nullptr,
+		frameState);
+
+	if (commitRequests)
+	{
+		for (const RuntimeLiveOscCommitRequest& request : liveCommitRequests)
+			commitRequests->push_back({ request.routeKey, request.layerKey, request.parameterKey, request.value, request.generation });
+	}
+	return resolved;
+}
+
+void RenderEngine::RenderPreparedFrame(const RenderFrameState& frameState)
+{
+	RenderLayerStack(
+		frameState.hasInputSource,
+		frameState.layerStates,
+		frameState.inputFrameWidth,
+		frameState.inputFrameHeight,
+		frameState.captureTextureWidth,
+		frameState.inputPixelFormat,
+		frameState.historyCap);
+}
+
+void RenderEngine::RenderLayerStack(
+	bool hasInputSource,
+	const std::vector<RuntimeRenderState>& layerStates,
+	unsigned inputFrameWidth,
+	unsigned inputFrameHeight,
+	unsigned captureTextureWidth,
+	VideoIOPixelFormat inputPixelFormat,
+	unsigned historyCap)
+{
+	ReportWrongThreadRenderAccess("render-layer-stack");
+	mRenderPass.Render(
+		hasInputSource,
+		layerStates,
+		inputFrameWidth,
+		inputFrameHeight,
+		captureTextureWidth,
+		inputPixelFormat,
+		historyCap,
+		[this](const RuntimeRenderState& state, OpenGLRenderer::LayerProgram::TextBinding& textBinding, std::string& error) {
+			return mShaderPrograms.UpdateTextBindingTexture(state, textBinding, error);
+		},
+		[this](const RuntimeRenderState& state, unsigned availableSourceHistoryLength, unsigned availableTemporalHistoryLength, bool feedbackAvailable) {
+			return mShaderPrograms.UpdateGlobalParamsBuffer(state, availableSourceHistoryLength, availableTemporalHistoryLength, feedbackAvailable);
+		});
+}
+
+bool RenderEngine::ReadOutputFrameRgbaOnRenderThread(unsigned width, unsigned height, std::vector<unsigned char>& bottomUpPixels)
+{
+	ReportWrongThreadRenderAccess("read-output-frame-rgba");
+	if (width == 0 || height == 0)
+		return false;
+
+	bottomUpPixels.resize(static_cast<std::size_t>(width) * height * 4);
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, mRenderer.OutputFramebuffer());
+	glReadBuffer(GL_COLOR_ATTACHMENT0);
+	glPixelStorei(GL_PACK_ALIGNMENT, 1);
+	glPixelStorei(GL_PACK_ROW_LENGTH, 0);
+	glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, bottomUpPixels.data());
+	glPixelStorei(GL_PACK_ALIGNMENT, 4);
+
+	return true;
+}
+
+bool RenderEngine::CaptureOutputFrameRgbaTopDownOnRenderThread(unsigned width, unsigned height, std::vector<unsigned char>& topDownPixels)
+{
+	std::vector<unsigned char> bottomUpPixels;
+	if (!ReadOutputFrameRgbaOnRenderThread(width, height, bottomUpPixels))
+		return false;
+
+	topDownPixels.resize(bottomUpPixels.size());
+	const std::size_t rowBytes = static_cast<std::size_t>(width) * 4;
+	for (unsigned y = 0; y < height; ++y)
+	{
+		const unsigned sourceY = height - 1 - y;
+		std::copy(
+			bottomUpPixels.begin() + static_cast<std::ptrdiff_t>(sourceY * rowBytes),
+			bottomUpPixels.begin() + static_cast<std::ptrdiff_t>((sourceY + 1) * rowBytes),
+			topDownPixels.begin() + static_cast<std::ptrdiff_t>(y * rowBytes));
+	}
+
+	return true;
+}

apps/LoopThroughWithOpenGLCompositing/gl/RenderEngine.h

@@ -0,0 +1,232 @@
+#pragma once
+
+#include "OpenGLRenderPass.h"
+#include "OpenGLRenderPipeline.h"
+#include "OpenGLRenderer.h"
+#include "OpenGLShaderPrograms.h"
+#include "RenderCommandQueue.h"
+#include "RenderFrameState.h"
+#include "RenderFrameStateResolver.h"
+#include "HealthTelemetry.h"
+#include "RuntimeCoordinator.h"
+#include "RuntimeSnapshotProvider.h"
+
+#include <windows.h>
+
+#include <atomic>
+#include <cstdint>
+#include <chrono>
+#include <condition_variable>
+#include <functional>
+#include <future>
+#include <memory>
+#include <mutex>
+#include <queue>
+#include <string>
+#include <thread>
+#include <utility>
+#include <vector>
+
+class RenderEngine
+{
+public:
+	using RenderEffectCallback = std::function<void()>;
+	using ScreenshotCallback = std::function<void()>;
+	using ScreenshotCaptureCallback = std::function<void(unsigned, unsigned, std::vector<unsigned char>)>;
+	using PreviewPaintCallback = std::function<void()>;
+
+	struct OscOverlayUpdate
+	{
+		std::string routeKey;
+		std::string layerKey;
+		std::string parameterKey;
+		JsonValue targetValue;
+	};
+
+	struct OscOverlayCommitCompletion
+	{
+		std::string routeKey;
+		uint64_t generation = 0;
+	};
+
+	struct OscOverlayCommitRequest
+	{
+		std::string routeKey;
+		std::string layerKey;
+		std::string parameterKey;
+		JsonValue value;
+		uint64_t generation = 0;
+	};
+
+	RenderEngine(
+		RuntimeSnapshotProvider& runtimeSnapshotProvider,
+		HealthTelemetry& healthTelemetry,
+		HDC hdc,
+		HGLRC hglrc,
+		RenderEffectCallback renderEffect,
+		ScreenshotCallback screenshotReady,
+		PreviewPaintCallback previewPaint);
+	~RenderEngine();
+
+	bool StartRenderThread();
+	void StopRenderThread();
+
+	bool CompileDecodeShader(int errorMessageSize, char* errorMessage);
+	bool CompileOutputPackShader(int errorMessageSize, char* errorMessage);
+	bool InitializeResources(
+		unsigned inputFrameWidth,
+		unsigned inputFrameHeight,
+		unsigned captureTextureWidth,
+		unsigned outputFrameWidth,
+		unsigned outputFrameHeight,
+		unsigned outputPackTextureWidth,
+		std::string& error);
+	bool CompileLayerPrograms(unsigned inputFrameWidth, unsigned inputFrameHeight, int errorMessageSize, char* errorMessage);
+	bool ApplyPreparedShaderBuild(
+		const PreparedShaderBuild& preparedBuild,
+		unsigned inputFrameWidth,
+		unsigned inputFrameHeight,
+		bool preserveFeedbackState,
+		int errorMessageSize,
+		char* errorMessage);
+
+	void ResetTemporalHistoryState();
+	void ResetShaderFeedbackState();
+	void ApplyRuntimeCoordinatorRenderReset(RuntimeCoordinatorRenderResetScope resetScope);
+	void ClearOscOverlayState();
+	void ClearOscOverlayStateForLayerKey(const std::string& layerKey);
+	void UpdateOscOverlayState(
+		const std::vector<OscOverlayUpdate>& updates,
+		const std::vector<OscOverlayCommitCompletion>& completedCommits);
+	void ResizeView(int width, int height);
+	bool TryPresentPreview(bool force, unsigned previewFps, unsigned outputFrameWidth, unsigned outputFrameHeight);
+	bool RequestScreenshotCapture(unsigned width, unsigned height, ScreenshotCaptureCallback completion);
+	bool QueueInputFrame(const VideoIOFrame& inputFrame, const VideoIOState& videoState);
+	bool RequestOutputFrame(const RenderPipelineFrameContext& context, VideoIOOutputFrame& outputFrame);
+	bool ResolveRenderFrameState(
+		const RenderFrameInput& input,
+		std::vector<OscOverlayCommitRequest>* commitRequests,
+		RenderFrameState& frameState);
+	void RenderPreparedFrame(const RenderFrameState& frameState);
+
+private:
+	static constexpr std::chrono::milliseconds kRenderThreadRequestTimeout{ 250 };
+
+	struct RenderThreadTaskState
+	{
+		std::atomic<bool> started = false;
+		std::atomic<bool> cancelled = false;
+	};
+
+	template<typename Func>
+	auto InvokeOnRenderThread(Func&& func) -> decltype(func())
+	{
+		using Result = decltype(func());
+		if (!mRenderThreadRunning || GetCurrentThreadId() == mRenderThreadId)
+			return func();
+
+		auto task = std::make_shared<std::packaged_task<Result()>>(std::forward<Func>(func));
+		std::future<Result> result = task->get_future();
+		{
+			std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+			mRenderThreadTasks.push([task]() { (*task)(); });
+		}
+		mRenderThreadCondition.notify_one();
+		return result.get();
+	}
+
+	template<typename Func>
+	bool TryInvokeOnRenderThread(const char* operationName, Func&& func)
+	{
+		if (!mRenderThreadRunning || GetCurrentThreadId() == mRenderThreadId)
+			return func();
+
+		auto state = std::make_shared<RenderThreadTaskState>();
+		auto task = std::make_shared<std::packaged_task<bool()>>(
+			[state, func = std::forward<Func>(func)]() mutable {
+				state->started = true;
+				if (state->cancelled)
+					return false;
+
+				return func();
+			});
+		std::future<bool> result = task->get_future();
+		{
+			std::lock_guard<std::mutex> lock(mRenderThreadMutex);
+			if (mRenderThreadStopping)
+			{
+				ReportRenderThreadRequestFailure(operationName, "render thread is stopping");
+				return false;
+			}
+			mRenderThreadTasks.push([task]() { (*task)(); });
+		}
+		mRenderThreadCondition.notify_one();
+
+		if (result.wait_for(kRenderThreadRequestTimeout) == std::future_status::ready)
+			return result.get();
+
+		if (!state->started)
+		{
+			state->cancelled = true;
+			ReportRenderThreadRequestFailure(operationName, "timed out before execution");
+			return false;
+		}
+
+		ReportRenderThreadRequestFailure(operationName, "exceeded timeout while executing; waiting for safe completion");
+		return result.get();
+	}
+
+	void RenderThreadMain(std::promise<bool> ready);
+	void ReportRenderThreadRequestFailure(const char* operationName, const char* reason);
+	bool IsRenderThreadAccessExpected() const;
+	void ReportWrongThreadRenderAccess(const char* operationName) const;
+	bool CommitPreparedLayerPrograms(const PreparedShaderBuild& preparedBuild, unsigned inputFrameWidth, unsigned inputFrameHeight, int errorMessageSize, char* errorMessage);
+	void RenderLayerStack(
+		bool hasInputSource,
+		const std::vector<RuntimeRenderState>& layerStates,
+		unsigned inputFrameWidth,
+		unsigned inputFrameHeight,
+		unsigned captureTextureWidth,
+		VideoIOPixelFormat inputPixelFormat,
+		unsigned historyCap);
+	void ResetTemporalHistoryStateOnRenderThread();
+	void ResetShaderFeedbackStateOnRenderThread();
+	void ApplyRenderResetOnRenderThread(RenderCommandResetScope resetScope);
+	void ProcessRenderResetCommandsOnRenderThread();
+	void EnqueuePreviewPresentWake();
+	void ProcessPreviewPresentCommandsOnRenderThread();
+	void EnqueueInputUploadWake();
+	void ProcessInputUploadCommandsOnRenderThread();
+	void EnqueueScreenshotCaptureWake();
+	void ProcessScreenshotCaptureCommandsOnRenderThread();
+	bool PresentPreviewOnRenderThread(unsigned outputFrameWidth, unsigned outputFrameHeight);
+	bool UploadInputFrameOnRenderThread(const VideoIOFrame& inputFrame, const VideoIOState& videoState);
+	bool RenderOutputFrameOnRenderThread(const RenderPipelineFrameContext& context, VideoIOOutputFrame& outputFrame);
+	bool ReadOutputFrameRgbaOnRenderThread(unsigned width, unsigned height, std::vector<unsigned char>& bottomUpPixels);
+	bool CaptureOutputFrameRgbaTopDownOnRenderThread(unsigned width, unsigned height, std::vector<unsigned char>& topDownPixels);
+
+	OpenGLRenderer mRenderer;
+	OpenGLRenderPass mRenderPass;
+	OpenGLRenderPipeline mRenderPipeline;
+	OpenGLShaderPrograms mShaderPrograms;
+	HealthTelemetry& mHealthTelemetry;
+	HDC mHdc;
+	HGLRC mHglrc;
+
+	std::chrono::steady_clock::time_point mLastPreviewPresentTime;
+	RenderCommandQueue mRenderCommandQueue;
+	RenderFrameStateResolver mFrameStateResolver;
+	RuntimeLiveState mRuntimeLiveState;
+	std::thread mRenderThread;
+	std::atomic<DWORD> mRenderThreadId = 0;
+	std::mutex mRenderThreadMutex;
+	std::condition_variable mRenderThreadCondition;
+	std::queue<std::function<void()>> mRenderThreadTasks;
+	std::atomic<bool> mRenderThreadRunning = false;
+	bool mRenderThreadStopping = false;
+	bool mPreviewPresentWakePending = false;
+	bool mInputUploadWakePending = false;
+	bool mScreenshotCaptureWakePending = false;
+	ScreenshotCaptureCallback mScreenshotCaptureCompletion;
+	bool mResourcesDestroyed = false;
+};

apps/LoopThroughWithOpenGLCompositing/gl/composite/OpenGLComposite.cpp

@@ -0,0 +1,428 @@
+#include "DeckLinkDisplayMode.h"
+#include "OpenGLComposite.h"
+#include "GLExtensions.h"
+#include "PngScreenshotWriter.h"
+#include "RenderEngine.h"
+#include "RuntimeCoordinator.h"
+#include "RuntimeEventDispatcher.h"
+#include "RuntimeServiceLiveBridge.h"
+#include "RuntimeServices.h"
+#include "RuntimeSnapshotProvider.h"
+#include "RuntimeStore.h"
+#include "RuntimeUpdateController.h"
+#include "ShaderBuildQueue.h"
+#include "VideoBackend.h"
+
+#include <chrono>
+#include <ctime>
+#include <filesystem>
+#include <iomanip>
+#include <memory>
+#include <sstream>
+#include <string>
+#include <vector>
+
+OpenGLComposite::OpenGLComposite(HWND hWnd, HDC hDC, HGLRC hRC) :
+	hGLWnd(hWnd), hGLDC(hDC), hGLRC(hRC)
+{
+	mRuntimeStore = std::make_unique<RuntimeStore>();
+	mRuntimeEventDispatcher = std::make_unique<RuntimeEventDispatcher>();
+	mRuntimeSnapshotProvider = std::make_unique<RuntimeSnapshotProvider>(mRuntimeStore->GetRenderSnapshotBuilder(), *mRuntimeEventDispatcher);
+	mRuntimeCoordinator = std::make_unique<RuntimeCoordinator>(*mRuntimeStore, *mRuntimeEventDispatcher);
+	mRenderEngine = std::make_unique<RenderEngine>(
+		*mRuntimeSnapshotProvider,
+		mRuntimeStore->GetHealthTelemetry(),
+		hGLDC,
+		hGLRC,
+		[this]() { renderEffect(); },
+		[]() {},
+		[this]() { paintGL(false); });
+	mVideoBackend = std::make_unique<VideoBackend>(*mRenderEngine, mRuntimeStore->GetHealthTelemetry(), *mRuntimeEventDispatcher);
+	mShaderBuildQueue = std::make_unique<ShaderBuildQueue>(*mRuntimeSnapshotProvider, *mRuntimeEventDispatcher);
+	mRuntimeServices = std::make_unique<RuntimeServices>(*mRuntimeEventDispatcher);
+	mRuntimeUpdateController = std::make_unique<RuntimeUpdateController>(
+		*mRuntimeStore,
+		*mRuntimeCoordinator,
+		*mRuntimeEventDispatcher,
+		*mRuntimeServices,
+		*mRenderEngine,
+		*mShaderBuildQueue,
+		*mVideoBackend);
+}
+
+OpenGLComposite::~OpenGLComposite()
+{
+	if (mRuntimeServices)
+		mRuntimeServices->Stop();
+	if (mShaderBuildQueue)
+		mShaderBuildQueue->Stop();
+	if (mVideoBackend)
+		mVideoBackend->ReleaseResources();
+	if (mRuntimeStore)
+	{
+		std::string persistenceError;
+		if (!mRuntimeStore->FlushPersistenceForShutdown(std::chrono::seconds(2), persistenceError))
+			OutputDebugStringA((std::string("Persistence shutdown flush failed: ") + persistenceError + "\n").c_str());
+	}
+}
+
+bool OpenGLComposite::InitDeckLink()
+{
+	return InitVideoIO();
+}
+
+bool OpenGLComposite::InitVideoIO()
+{
+	VideoFormatSelection		videoModes;
+	std::string						initFailureReason;
+
+	if (mRuntimeStore && mRuntimeStore->GetRuntimeRepositoryRoot().empty())
+	{
+		std::string runtimeError;
+		if (!mRuntimeStore->InitializeStore(runtimeError))
+		{
+			MessageBoxA(NULL, runtimeError.c_str(), "Runtime host failed to initialize", MB_OK);
+			return false;
+		}
+	}
+
+	if (mRuntimeStore)
+	{
+		if (!ResolveConfiguredVideoFormats(
+			mRuntimeStore->GetConfiguredInputVideoFormat(),
+			mRuntimeStore->GetConfiguredInputFrameRate(),
+			mRuntimeStore->GetConfiguredOutputVideoFormat(),
+			mRuntimeStore->GetConfiguredOutputFrameRate(),
+			videoModes,
+			initFailureReason))
+		{
+			MessageBoxA(NULL, initFailureReason.c_str(), "DeckLink mode configuration error", MB_OK);
+			return false;
+		}
+	}
+
+	if (!mVideoBackend->DiscoverDevicesAndModes(videoModes, initFailureReason))
+	{
+		const char* title = initFailureReason == "Please install the Blackmagic DeckLink drivers to use the features of this application."
+			? "This application requires the DeckLink drivers installed."
+			: "DeckLink initialization failed";
+		MessageBoxA(NULL, initFailureReason.c_str(), title, MB_OK | MB_ICONERROR);
+		return false;
+	}
+	const bool outputAlphaRequired = mRuntimeStore && mRuntimeStore->IsExternalKeyingConfigured();
+	if (!mVideoBackend->SelectPreferredFormats(videoModes, outputAlphaRequired, initFailureReason))
+		goto error;
+
+	if (! CheckOpenGLExtensions())
+	{
+		initFailureReason = "OpenGL extension checks failed.";
+		goto error;
+	}
+
+	if (! InitOpenGLState())
+	{
+		initFailureReason = "OpenGL state initialization failed.";
+		goto error;
+	}
+
+	mVideoBackend->PublishStatus(
+		mRuntimeStore && mRuntimeStore->IsExternalKeyingConfigured(),
+		mVideoBackend->OutputModelName().empty()
+			? "DeckLink output device selected."
+			: ("Selected output device: " + mVideoBackend->OutputModelName()));
+
+	// Resize window to match output video frame, but scale large formats down by half for viewing.
+	if (mVideoBackend->OutputFrameWidth() < 1920)
+		resizeWindow(mVideoBackend->OutputFrameWidth(), mVideoBackend->OutputFrameHeight());
+	else
+		resizeWindow(mVideoBackend->OutputFrameWidth() / 2, mVideoBackend->OutputFrameHeight() / 2);
+
+	if (!mVideoBackend->ConfigureInput(videoModes.input, initFailureReason))
+	{
+		goto error;
+	}
+	if (!mVideoBackend->HasInputDevice())
+		mVideoBackend->ReportNoInputDeviceSignalStatus();
+
+	if (!mVideoBackend->ConfigureOutput(videoModes.output, mRuntimeStore && mRuntimeStore->IsExternalKeyingConfigured(), initFailureReason))
+	{
+		goto error;
+	}
+
+	mVideoBackend->PublishStatus(
+		mRuntimeStore && mRuntimeStore->IsExternalKeyingConfigured(),
+		mVideoBackend->StatusMessage());
+
+	return true;
+
+error:
+	if (!initFailureReason.empty())
+		MessageBoxA(NULL, initFailureReason.c_str(), "DeckLink initialization failed", MB_OK | MB_ICONERROR);
+	mVideoBackend->ReleaseResources();
+	return false;
+}
+
+void OpenGLComposite::paintGL(bool force)
+{
+	if (mRuntimeUpdateController)
+		mRuntimeUpdateController->ProcessRuntimeWork();
+
+	if (!force)
+	{
+		if (IsIconic(hGLWnd))
+			return;
+	}
+
+	const unsigned previewFps = mRuntimeStore ? mRuntimeStore->GetConfiguredPreviewFps() : 30u;
+	if (!force && mVideoBackend && mVideoBackend->ShouldPrioritizeOutputOverPreview())
+	{
+		ValidateRect(hGLWnd, NULL);
+		return;
+	}
+
+	if (!mRenderEngine->TryPresentPreview(force, previewFps, mVideoBackend->OutputFrameWidth(), mVideoBackend->OutputFrameHeight()))
+	{
+		ValidateRect(hGLWnd, NULL);
+		return;
+	}
+
+	ValidateRect(hGLWnd, NULL);
+}
+
+void OpenGLComposite::resizeGL(WORD width, WORD height)
+{
+	// We don't set the project or model matrices here since the window data is copied directly from
+	// an off-screen FBO in paintGL().  Just save the width and height for use in paintGL().
+	mRenderEngine->ResizeView(width, height);
+}
+
+void OpenGLComposite::resizeWindow(int width, int height)
+{
+	RECT r;
+	if (GetWindowRect(hGLWnd, &r))
+	{
+		SetWindowPos(hGLWnd, HWND_TOP, r.left, r.top, r.left + width, r.top + height, 0);
+	}
+}
+
+bool OpenGLComposite::InitOpenGLState()
+{
+	if (! ResolveGLExtensions())
+		return false;
+
+	std::string runtimeError;
+	if (mRuntimeStore->GetRuntimeRepositoryRoot().empty() && !mRuntimeStore->InitializeStore(runtimeError))
+	{
+		MessageBoxA(NULL, runtimeError.c_str(), "Runtime host failed to initialize", MB_OK);
+		return false;
+	}
+
+	if (!mRuntimeServices->Start(*this, *mRuntimeStore, runtimeError))
+	{
+		MessageBoxA(NULL, runtimeError.c_str(), "Runtime control services failed to start", MB_OK);
+		return false;
+	}
+
+	// Prepare the runtime shader program generated from the active shader package.
+	char compilerErrorMessage[1024];
+	if (!mRenderEngine->CompileDecodeShader(sizeof(compilerErrorMessage), compilerErrorMessage))
+	{
+		MessageBoxA(NULL, compilerErrorMessage, "OpenGL decode shader failed to load or compile", MB_OK);
+		return false;
+	}
+	if (!mRenderEngine->CompileOutputPackShader(sizeof(compilerErrorMessage), compilerErrorMessage))
+	{
+		MessageBoxA(NULL, compilerErrorMessage, "OpenGL output pack shader failed to load or compile", MB_OK);
+		return false;
+	}
+
+	std::string rendererError;
+	if (!mRenderEngine->InitializeResources(
+		mVideoBackend->InputFrameWidth(),
+		mVideoBackend->InputFrameHeight(),
+		mVideoBackend->CaptureTextureWidth(),
+		mVideoBackend->OutputFrameWidth(),
+		mVideoBackend->OutputFrameHeight(),
+		mVideoBackend->OutputPackTextureWidth(),
+		rendererError))
+	{
+		MessageBoxA(NULL, rendererError.c_str(), "OpenGL initialization error.", MB_OK);
+		return false;
+	}
+
+	if (!mRenderEngine->CompileLayerPrograms(mVideoBackend->InputFrameWidth(), mVideoBackend->InputFrameHeight(), sizeof(compilerErrorMessage), compilerErrorMessage))
+	{
+		MessageBoxA(NULL, compilerErrorMessage, "OpenGL shader failed to load or compile", MB_OK);
+		return false;
+	}
+	mRuntimeStore->SetCompileStatus(true, "Shader layers compiled successfully.");
+
+	mRenderEngine->ResetTemporalHistoryState();
+	mRenderEngine->ResetShaderFeedbackState();
+
+	mRuntimeUpdateController->BroadcastRuntimeState();
+	mRuntimeServices->BeginPolling(*mRuntimeCoordinator);
+	return true;
+}
+
+bool OpenGLComposite::Start()
+{
+	if (!mRenderEngine->StartRenderThread())
+		return false;
+
+	if (mRuntimeUpdateController)
+		mRuntimeUpdateController->ProcessRuntimeWork();
+
+	if (mVideoBackend->Start())
+		return true;
+
+	mRenderEngine->StopRenderThread();
+	return false;
+}
+
+bool OpenGLComposite::Stop()
+{
+	if (mRuntimeServices)
+		mRuntimeServices->Stop();
+
+	const bool wasExternalKeyingActive = mVideoBackend->ExternalKeyingActive();
+	mVideoBackend->Stop();
+	if (wasExternalKeyingActive)
+		mVideoBackend->PublishStatus(
+			mRuntimeStore && mRuntimeStore->IsExternalKeyingConfigured(),
+			"External keying has been disabled.");
+
+	if (mRenderEngine)
+		mRenderEngine->StopRenderThread();
+
+	if (mRuntimeStore)
+	{
+		std::string persistenceError;
+		if (!mRuntimeStore->FlushPersistenceForShutdown(std::chrono::seconds(2), persistenceError))
+			OutputDebugStringA((std::string("Persistence shutdown flush failed: ") + persistenceError + "\n").c_str());
+	}
+
+	return true;
+}
+
+bool OpenGLComposite::ReloadShader(bool preserveFeedbackState)
+{
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->RequestShaderReload(preserveFeedbackState));
+}
+
+bool OpenGLComposite::RequestScreenshot(std::string& error)
+{
+	if (!mRenderEngine || !mVideoBackend)
+	{
+		error = "The render engine is not ready.";
+		return false;
+	}
+
+	const unsigned width = mVideoBackend->OutputFrameWidth();
+	const unsigned height = mVideoBackend->OutputFrameHeight();
+	if (width == 0 || height == 0)
+	{
+		error = "The output frame size is not available.";
+		return false;
+	}
+
+	std::filesystem::path outputPath;
+	try
+	{
+		outputPath = BuildScreenshotPath();
+		std::filesystem::create_directories(outputPath.parent_path());
+	}
+	catch (const std::exception& exception)
+	{
+		error = exception.what();
+		return false;
+	}
+
+	if (!mRenderEngine->RequestScreenshotCapture(
+		width,
+		height,
+		[outputPath](unsigned captureWidth, unsigned captureHeight, std::vector<unsigned char> topDownPixels) {
+			try
+			{
+				WritePngFileAsync(outputPath, captureWidth, captureHeight, std::move(topDownPixels));
+			}
+			catch (const std::exception& exception)
+			{
+				OutputDebugStringA((std::string("Screenshot request failed: ") + exception.what() + "\n").c_str());
+			}
+		}))
+	{
+		error = "Screenshot capture request failed.";
+		return false;
+	}
+
+	return true;
+}
+
+void OpenGLComposite::renderEffect()
+{
+	const RenderFrameInput frameInput = BuildRenderFrameInput();
+	RenderFrame(frameInput);
+}
+
+RenderFrameInput OpenGLComposite::BuildRenderFrameInput() const
+{
+	RenderFrameInput frameInput;
+	frameInput.useCommittedLayerStates = mRuntimeCoordinator && mRuntimeCoordinator->UseCommittedLayerStates();
+	frameInput.hasInputSource = mVideoBackend->HasInputSource();
+	frameInput.renderWidth = mVideoBackend->InputFrameWidth();
+	frameInput.renderHeight = mVideoBackend->InputFrameHeight();
+	frameInput.inputFrameWidth = mVideoBackend->InputFrameWidth();
+	frameInput.inputFrameHeight = mVideoBackend->InputFrameHeight();
+	frameInput.captureTextureWidth = mVideoBackend->CaptureTextureWidth();
+	frameInput.inputPixelFormat = mVideoBackend->InputPixelFormat();
+	frameInput.historyCap = mRuntimeStore ? mRuntimeStore->GetConfiguredMaxTemporalHistoryFrames() : 0;
+	frameInput.oscSmoothing = mRuntimeStore ? mRuntimeStore->GetConfiguredOscSmoothing() : 0.0;
+	return frameInput;
+}
+
+void OpenGLComposite::RenderFrame(const RenderFrameInput& frameInput)
+{
+	RenderFrameState frameState;
+	if (mRuntimeServices)
+	{
+		RuntimeServiceLiveBridge::PrepareLiveRenderFrameState(
+			*mRuntimeServices,
+			*mRenderEngine,
+			frameInput,
+			frameState);
+	}
+	else
+	{
+		mRenderEngine->ResolveRenderFrameState(frameInput, nullptr, frameState);
+	}
+	mRenderEngine->RenderPreparedFrame(frameState);
+}
+
+std::filesystem::path OpenGLComposite::BuildScreenshotPath() const
+{
+	const std::filesystem::path root = mRuntimeStore && !mRuntimeStore->GetRuntimeDataRoot().empty()
+		? mRuntimeStore->GetRuntimeDataRoot()
+		: std::filesystem::current_path();
+
+	const auto now = std::chrono::system_clock::now();
+	const auto milliseconds = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()) % 1000;
+	const std::time_t nowTime = std::chrono::system_clock::to_time_t(now);
+	std::tm localTime = {};
+	localtime_s(&localTime, &nowTime);
+
+	std::ostringstream filename;
+	filename << "video-shader-toys-"
+		<< std::put_time(&localTime, "%Y%m%d-%H%M%S")
+		<< "-" << std::setw(3) << std::setfill('0') << milliseconds.count()
+		<< ".png";
+
+	return root / "screenshots" / filename.str();
+}
+
+bool OpenGLComposite::CheckOpenGLExtensions()
+{
+	return true;
+}

apps/LoopThroughWithOpenGLCompositing/gl/composite/OpenGLComposite.h

@@ -2,36 +2,23 @@
 #define __OPENGL_COMPOSITE_H__
 
 #include <windows.h>
-#include <process.h>
-#include <tchar.h>
-#include <gl/gl.h>
-#include <gl/glu.h>
-
 #include <objbase.h>
-#include <atlbase.h>
-#include <comutil.h>
 
-#include "GLExtensions.h"
-#include "OpenGLRenderer.h"
-#include "RuntimeHost.h"
+#include "RenderFrameState.h"
 
-#include <functional>
-#include <atomic>
 #include <filesystem>
-#include <map>
 #include <memory>
 #include <string>
-#include <vector>
-#include <deque>
-#include <chrono>
 
-class VideoIODevice;
-class OpenGLVideoIOBridge;
-class OpenGLRenderPass;
-class OpenGLRenderPipeline;
-class OpenGLShaderPrograms;
+class RenderEngine;
+class RuntimeCoordinator;
+class RuntimeEventDispatcher;
+class RuntimeSnapshotProvider;
 class RuntimeServices;
+class RuntimeStore;
+class RuntimeUpdateController;
 class ShaderBuildQueue;
+class VideoBackend;
 
 
 class OpenGLComposite
@@ -71,55 +58,26 @@ public:
 private:
 	void resizeWindow(int width, int height);
 	bool CheckOpenGLExtensions();
-	void PublishVideoIOStatus(const std::string& statusMessage);
-	using LayerProgram = OpenGLRenderer::LayerProgram;
-	struct OscOverlayState
-	{
-		std::string layerKey;
-		std::string parameterKey;
-		JsonValue targetValue;
-		ShaderParameterValue currentValue;
-		bool hasCurrentValue = false;
-		std::chrono::steady_clock::time_point lastUpdatedTime;
-		std::chrono::steady_clock::time_point lastAppliedTime;
-		uint64_t generation = 0;
-		uint64_t pendingCommitGeneration = 0;
-		bool commitQueued = false;
-	};
 
 	HWND									hGLWnd;
 	HDC										hGLDC;
 	HGLRC									hGLRC;
-	CRITICAL_SECTION						pMutex;
 
-	std::unique_ptr<VideoIODevice>			mVideoIO;
-	std::unique_ptr<OpenGLRenderer>			mRenderer;
-	std::unique_ptr<RuntimeHost>				mRuntimeHost;
-	std::unique_ptr<OpenGLVideoIOBridge>		mVideoIOBridge;
-	std::unique_ptr<OpenGLRenderPass>		mRenderPass;
-	std::unique_ptr<OpenGLRenderPipeline>	mRenderPipeline;
-	std::unique_ptr<OpenGLShaderPrograms>	mShaderPrograms;
+	std::unique_ptr<RuntimeStore>			mRuntimeStore;
+	std::unique_ptr<RuntimeCoordinator>		mRuntimeCoordinator;
+	std::unique_ptr<RuntimeSnapshotProvider>	mRuntimeSnapshotProvider;
+	std::unique_ptr<RuntimeEventDispatcher>	mRuntimeEventDispatcher;
+	std::unique_ptr<RenderEngine>			mRenderEngine;
 	std::unique_ptr<ShaderBuildQueue>		mShaderBuildQueue;
 	std::unique_ptr<RuntimeServices>		mRuntimeServices;
-	std::vector<RuntimeRenderState>			mCachedLayerRenderStates;
-	uint64_t								mCachedRenderStateVersion = 0;
-	uint64_t								mCachedParameterStateVersion = 0;
-	unsigned								mCachedRenderStateWidth = 0;
-	unsigned								mCachedRenderStateHeight = 0;
-	std::map<std::string, OscOverlayState>	mOscOverlayStates;
-	std::atomic<bool>						mUseCommittedLayerStates;
-	std::atomic<bool>						mScreenshotRequested;
-	std::chrono::steady_clock::time_point	mLastPreviewPresentTime;
-	bool									mPreserveFeedbackOnNextShaderBuild = false;
+	std::unique_ptr<RuntimeUpdateController> mRuntimeUpdateController;
+	std::unique_ptr<VideoBackend>			mVideoBackend;
 
 	bool InitOpenGLState();
 	void renderEffect();
-	bool ProcessRuntimePollResults();
-	void RequestShaderBuild();
-	void ProcessScreenshotRequest();
+	RenderFrameInput BuildRenderFrameInput() const;
+	void RenderFrame(const RenderFrameInput& frameInput);
 	std::filesystem::path BuildScreenshotPath() const;
-	void broadcastRuntimeState();
-	void resetTemporalHistoryState();
 };
 
 #endif		// __OPENGL_COMPOSITE_H__

apps/LoopThroughWithOpenGLCompositing/gl/composite/OpenGLCompositeRuntimeControls.cpp

@@ -0,0 +1,126 @@
+#include "OpenGLComposite.h"
+#include "RuntimeCoordinator.h"
+#include "RuntimeJson.h"
+#include "RuntimeServices.h"
+#include "RuntimeStore.h"
+#include "RuntimeUpdateController.h"
+
+std::string OpenGLComposite::GetRuntimeStateJson() const
+{
+	return mRuntimeStore ? mRuntimeStore->BuildPersistentStateJson() : "{}";
+}
+
+unsigned short OpenGLComposite::GetControlServerPort() const
+{
+	return mRuntimeStore ? mRuntimeStore->GetConfiguredControlServerPort() : 0;
+}
+
+unsigned short OpenGLComposite::GetOscPort() const
+{
+	return mRuntimeStore ? mRuntimeStore->GetConfiguredOscPort() : 0;
+}
+
+std::string OpenGLComposite::GetOscBindAddress() const
+{
+	return mRuntimeStore ? mRuntimeStore->GetConfiguredOscBindAddress() : "127.0.0.1";
+}
+
+std::string OpenGLComposite::GetControlUrl() const
+{
+	return "http://127.0.0.1:" + std::to_string(GetControlServerPort()) + "/";
+}
+
+std::string OpenGLComposite::GetDocsUrl() const
+{
+	return "http://127.0.0.1:" + std::to_string(GetControlServerPort()) + "/docs";
+}
+
+std::string OpenGLComposite::GetOscAddress() const
+{
+	return "udp://" + GetOscBindAddress() + ":" + std::to_string(GetOscPort()) + " /VideoShaderToys/{Layer}/{Parameter}";
+}
+
+bool OpenGLComposite::AddLayer(const std::string& shaderId, std::string& error)
+{
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->AddLayer(shaderId), &error);
+}
+
+bool OpenGLComposite::RemoveLayer(const std::string& layerId, std::string& error)
+{
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->RemoveLayer(layerId), &error);
+}
+
+bool OpenGLComposite::MoveLayer(const std::string& layerId, int direction, std::string& error)
+{
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->MoveLayer(layerId, direction), &error);
+}
+
+bool OpenGLComposite::MoveLayerToIndex(const std::string& layerId, std::size_t targetIndex, std::string& error)
+{
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->MoveLayerToIndex(layerId, targetIndex), &error);
+}
+
+bool OpenGLComposite::SetLayerBypass(const std::string& layerId, bool bypassed, std::string& error)
+{
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->SetLayerBypass(layerId, bypassed), &error);
+}
+
+bool OpenGLComposite::SetLayerShader(const std::string& layerId, const std::string& shaderId, std::string& error)
+{
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->SetLayerShader(layerId, shaderId), &error);
+}
+
+bool OpenGLComposite::UpdateLayerParameterJson(const std::string& layerId, const std::string& parameterId, const std::string& valueJson, std::string& error)
+{
+	JsonValue parsedValue;
+	if (!ParseJson(valueJson, parsedValue, error))
+		return false;
+
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->UpdateLayerParameter(layerId, parameterId, parsedValue), &error);
+}
+
+bool OpenGLComposite::UpdateLayerParameterByControlKeyJson(const std::string& layerKey, const std::string& parameterKey, const std::string& valueJson, std::string& error)
+{
+	JsonValue parsedValue;
+	if (!ParseJson(valueJson, parsedValue, error))
+		return false;
+
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->UpdateLayerParameterByControlKey(layerKey, parameterKey, parsedValue), &error);
+}
+
+bool OpenGLComposite::ResetLayerParameters(const std::string& layerId, std::string& error)
+{
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->ResetLayerParameters(layerId), &error);
+}
+
+bool OpenGLComposite::SaveStackPreset(const std::string& presetName, std::string& error)
+{
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->SaveStackPreset(presetName), &error);
+}
+
+bool OpenGLComposite::LoadStackPreset(const std::string& presetName, std::string& error)
+{
+	return mRuntimeCoordinator &&
+		mRuntimeUpdateController &&
+		mRuntimeUpdateController->ApplyRuntimeCoordinatorResult(mRuntimeCoordinator->LoadStackPreset(presetName), &error);
+}

apps/LoopThroughWithOpenGLCompositing/gl/frame/RenderFrameState.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include "ShaderTypes.h"
+#include "VideoIOTypes.h"
+
+#include <vector>
+
+struct RenderFrameInput
+{
+	bool useCommittedLayerStates = false;
+	bool hasInputSource = false;
+	unsigned renderWidth = 0;
+	unsigned renderHeight = 0;
+	unsigned inputFrameWidth = 0;
+	unsigned inputFrameHeight = 0;
+	unsigned captureTextureWidth = 0;
+	VideoIOPixelFormat inputPixelFormat = VideoIOPixelFormat::Uyvy8;
+	unsigned historyCap = 0;
+	double oscSmoothing = 0.0;
+};
+
+struct RenderFrameState
+{
+	bool hasInputSource = false;
+	unsigned inputFrameWidth = 0;
+	unsigned inputFrameHeight = 0;
+	unsigned captureTextureWidth = 0;
+	VideoIOPixelFormat inputPixelFormat = VideoIOPixelFormat::Uyvy8;
+	unsigned historyCap = 0;
+	std::vector<RuntimeRenderState> layerStates;
+};

apps/LoopThroughWithOpenGLCompositing/gl/frame/RenderFrameStateResolver.cpp

@@ -0,0 +1,119 @@
+#include "RenderFrameStateResolver.h"
+
+#include <chrono>
+
+namespace
+{
+constexpr auto kOscOverlayCommitDelay = std::chrono::milliseconds(150);
+}
+
+RenderFrameStateResolver::RenderFrameStateResolver(RuntimeSnapshotProvider& runtimeSnapshotProvider) :
+	mRuntimeSnapshotProvider(runtimeSnapshotProvider)
+{
+}
+
+void RenderFrameStateResolver::StoreCommittedSnapshot(
+	const RuntimeRenderStateSnapshot& snapshot,
+	const std::vector<RuntimeRenderState>& committedLayerStates)
+{
+	mCachedLayerRenderStates = committedLayerStates;
+	mCachedRenderStateVersion = snapshot.versions.renderStateVersion;
+	mCachedParameterStateVersion = snapshot.versions.parameterStateVersion;
+	mCachedRenderStateWidth = snapshot.outputWidth;
+	mCachedRenderStateHeight = snapshot.outputHeight;
+}
+
+bool RenderFrameStateResolver::Resolve(
+	const RenderFrameInput& input,
+	const std::vector<RuntimeRenderState>& committedLayerStates,
+	RuntimeLiveState& liveState,
+	std::vector<RuntimeLiveOscCommitRequest>* commitRequests,
+	RenderFrameState& frameState)
+{
+	frameState.hasInputSource = input.hasInputSource;
+	frameState.inputFrameWidth = input.inputFrameWidth;
+	frameState.inputFrameHeight = input.inputFrameHeight;
+	frameState.captureTextureWidth = input.captureTextureWidth;
+	frameState.inputPixelFormat = input.inputPixelFormat;
+	frameState.historyCap = input.historyCap;
+	frameState.layerStates.clear();
+
+	if (input.useCommittedLayerStates)
+	{
+		frameState.layerStates = ComposeLayerStates(committedLayerStates, liveState, false, input.oscSmoothing, commitRequests);
+		mRuntimeSnapshotProvider.RefreshDynamicRenderStateFields(frameState.layerStates);
+		return true;
+	}
+
+	const RuntimeSnapshotVersions versions = mRuntimeSnapshotProvider.GetVersions();
+	const bool renderStateCacheValid =
+		!mCachedLayerRenderStates.empty() &&
+		mCachedRenderStateVersion == versions.renderStateVersion &&
+		mCachedRenderStateWidth == input.renderWidth &&
+		mCachedRenderStateHeight == input.renderHeight;
+
+	if (renderStateCacheValid)
+	{
+		RuntimeRenderStateSnapshot renderSnapshot;
+		renderSnapshot.outputWidth = input.renderWidth;
+		renderSnapshot.outputHeight = input.renderHeight;
+		renderSnapshot.versions.renderStateVersion = mCachedRenderStateVersion;
+		renderSnapshot.versions.parameterStateVersion = mCachedParameterStateVersion;
+		renderSnapshot.states = mCachedLayerRenderStates;
+
+		renderSnapshot.states = ComposeLayerStates(renderSnapshot.states, liveState, true, input.oscSmoothing, commitRequests);
+		if (mCachedParameterStateVersion != versions.parameterStateVersion &&
+			mRuntimeSnapshotProvider.TryRefreshPublishedSnapshotParameters(renderSnapshot))
+		{
+			mCachedParameterStateVersion = renderSnapshot.versions.parameterStateVersion;
+			renderSnapshot.states = ComposeLayerStates(renderSnapshot.states, liveState, true, input.oscSmoothing, commitRequests);
+		}
+
+		mCachedLayerRenderStates = renderSnapshot.states;
+		frameState.layerStates = renderSnapshot.states;
+		mRuntimeSnapshotProvider.RefreshDynamicRenderStateFields(frameState.layerStates);
+		return true;
+	}
+
+	RuntimeRenderStateSnapshot renderSnapshot;
+	if (mRuntimeSnapshotProvider.TryPublishRenderStateSnapshot(input.renderWidth, input.renderHeight, renderSnapshot))
+	{
+		mCachedLayerRenderStates = renderSnapshot.states;
+		mCachedRenderStateVersion = renderSnapshot.versions.renderStateVersion;
+		mCachedParameterStateVersion = renderSnapshot.versions.parameterStateVersion;
+		mCachedRenderStateWidth = renderSnapshot.outputWidth;
+		mCachedRenderStateHeight = renderSnapshot.outputHeight;
+		mCachedLayerRenderStates = ComposeLayerStates(mCachedLayerRenderStates, liveState, true, input.oscSmoothing, commitRequests);
+		frameState.layerStates = mCachedLayerRenderStates;
+		return true;
+	}
+
+	frameState.layerStates = ComposeLayerStates(mCachedLayerRenderStates, liveState, true, input.oscSmoothing, commitRequests);
+	mRuntimeSnapshotProvider.RefreshDynamicRenderStateFields(frameState.layerStates);
+	return !frameState.layerStates.empty();
+}
+
+std::vector<RuntimeRenderState> RenderFrameStateResolver::ComposeLayerStates(
+	const std::vector<RuntimeRenderState>& baseStates,
+	RuntimeLiveState& liveState,
+	bool allowCommit,
+	double smoothing,
+	std::vector<RuntimeLiveOscCommitRequest>* commitRequests) const
+{
+	LayeredRenderStateInput input;
+	input.committedLiveLayerStates = &baseStates;
+	input.transientAutomationOverlay = &liveState;
+	input.allowTransientAutomationCommits = allowCommit;
+	input.collectTransientAutomationCommitRequests = commitRequests != nullptr;
+	input.transientAutomationSmoothing = smoothing;
+	input.transientAutomationCommitDelay = kOscOverlayCommitDelay;
+	input.now = std::chrono::steady_clock::now();
+	const RenderStateCompositionResult result = mRenderStateComposer.BuildFrameState(input);
+
+	if (commitRequests)
+	{
+		for (const RuntimeLiveOscCommitRequest& request : result.commitRequests)
+			commitRequests->push_back(request);
+	}
+	return result.layerStates;
+}

apps/LoopThroughWithOpenGLCompositing/gl/frame/RenderFrameStateResolver.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include "RenderFrameState.h"
+#include "RenderStateComposer.h"
+#include "RuntimeSnapshotProvider.h"
+
+#include <cstdint>
+#include <vector>
+
+class RenderFrameStateResolver
+{
+public:
+	explicit RenderFrameStateResolver(RuntimeSnapshotProvider& runtimeSnapshotProvider);
+
+	void StoreCommittedSnapshot(
+		const RuntimeRenderStateSnapshot& snapshot,
+		const std::vector<RuntimeRenderState>& committedLayerStates);
+	bool Resolve(
+		const RenderFrameInput& input,
+		const std::vector<RuntimeRenderState>& committedLayerStates,
+		RuntimeLiveState& liveState,
+		std::vector<RuntimeLiveOscCommitRequest>* commitRequests,
+		RenderFrameState& frameState);
+
+private:
+	std::vector<RuntimeRenderState> ComposeLayerStates(
+		const std::vector<RuntimeRenderState>& baseStates,
+		RuntimeLiveState& liveState,
+		bool allowCommit,
+		double smoothing,
+		std::vector<RuntimeLiveOscCommitRequest>* commitRequests) const;
+
+	RuntimeSnapshotProvider& mRuntimeSnapshotProvider;
+	RenderStateComposer mRenderStateComposer;
+	std::vector<RuntimeRenderState> mCachedLayerRenderStates;
+	uint64_t mCachedRenderStateVersion = 0;
+	uint64_t mCachedParameterStateVersion = 0;
+	unsigned mCachedRenderStateWidth = 0;
+	unsigned mCachedRenderStateHeight = 0;
+};

apps/LoopThroughWithOpenGLCompositing/gl/frame/RuntimeUpdateController.cpp

@@ -0,0 +1,378 @@
+#include "RuntimeUpdateController.h"
+
+#include "RenderEngine.h"
+#include "RuntimeEventDispatcher.h"
+#include "RuntimeServices.h"
+#include "RuntimeStore.h"
+#include "ShaderBuildQueue.h"
+#include "VideoBackend.h"
+
+#include <variant>
+
+namespace
+{
+RuntimeCoordinatorRenderResetScope ToRuntimeCoordinatorRenderResetScope(RuntimeEventRenderResetScope scope)
+{
+	switch (scope)
+	{
+	case RuntimeEventRenderResetScope::TemporalHistoryOnly:
+		return RuntimeCoordinatorRenderResetScope::TemporalHistoryOnly;
+	case RuntimeEventRenderResetScope::TemporalHistoryAndFeedback:
+		return RuntimeCoordinatorRenderResetScope::TemporalHistoryAndFeedback;
+	case RuntimeEventRenderResetScope::None:
+	default:
+		return RuntimeCoordinatorRenderResetScope::None;
+	}
+}
+}
+
+RuntimeUpdateController::RuntimeUpdateController(
+	RuntimeStore& runtimeStore,
+	RuntimeCoordinator& runtimeCoordinator,
+	RuntimeEventDispatcher& runtimeEventDispatcher,
+	RuntimeServices& runtimeServices,
+	RenderEngine& renderEngine,
+	ShaderBuildQueue& shaderBuildQueue,
+	VideoBackend& videoBackend) :
+	mRuntimeStore(runtimeStore),
+	mRuntimeCoordinator(runtimeCoordinator),
+	mRuntimeEventDispatcher(runtimeEventDispatcher),
+	mRuntimeServices(runtimeServices),
+	mRenderEngine(renderEngine),
+	mShaderBuildQueue(shaderBuildQueue),
+	mVideoBackend(videoBackend)
+{
+	mRuntimeEventDispatcher.Subscribe(
+		RuntimeEventType::RuntimeStateBroadcastRequested,
+		[this](const RuntimeEvent& event) { HandleRuntimeStateBroadcastRequested(event); });
+	mRuntimeEventDispatcher.Subscribe(
+		RuntimeEventType::RuntimeReloadRequested,
+		[this](const RuntimeEvent& event) { HandleRuntimeReloadRequested(event); });
+	mRuntimeEventDispatcher.Subscribe(
+		RuntimeEventType::RuntimePersistenceRequested,
+		[this](const RuntimeEvent& event) { HandleRuntimePersistenceRequested(event); });
+	mRuntimeEventDispatcher.Subscribe(
+		RuntimeEventType::ShaderBuildRequested,
+		[this](const RuntimeEvent& event) { HandleShaderBuildRequested(event); });
+	mRuntimeEventDispatcher.Subscribe(
+		RuntimeEventType::ShaderBuildPrepared,
+		[this](const RuntimeEvent& event) { HandleShaderBuildPrepared(event); });
+	mRuntimeEventDispatcher.Subscribe(
+		RuntimeEventType::ShaderBuildFailed,
+		[this](const RuntimeEvent& event) { HandleShaderBuildFailed(event); });
+	mRuntimeEventDispatcher.Subscribe(
+		RuntimeEventType::CompileStatusChanged,
+		[this](const RuntimeEvent& event) { HandleCompileStatusChanged(event); });
+	mRuntimeEventDispatcher.Subscribe(
+		RuntimeEventType::RenderResetRequested,
+		[this](const RuntimeEvent& event) { HandleRenderResetRequested(event); });
+}
+
+bool RuntimeUpdateController::ApplyRuntimeCoordinatorResult(const RuntimeCoordinatorResult& result, std::string* error)
+{
+	if (!result.accepted)
+	{
+		if (error)
+			*error = result.errorMessage;
+		return false;
+	}
+
+	if (result.compileStatusChanged)
+	{
+		mRuntimeStore.SetCompileStatus(result.compileStatusSucceeded, result.compileStatusMessage);
+		++mPendingCoordinatorCompileStatusEvents;
+	}
+
+	if (result.clearReloadRequest)
+		mRuntimeStore.ClearReloadRequest();
+
+	mRuntimeCoordinator.ApplyCommittedStateMode(result.committedStateMode);
+
+	switch (result.transientOscInvalidation)
+	{
+	case RuntimeCoordinatorTransientOscInvalidation::All:
+		mRenderEngine.ClearOscOverlayState();
+		mRuntimeServices.ClearOscState();
+		break;
+	case RuntimeCoordinatorTransientOscInvalidation::Layer:
+		mRenderEngine.ClearOscOverlayStateForLayerKey(result.transientOscLayerKey);
+		mRuntimeServices.ClearOscStateForLayerKey(result.transientOscLayerKey);
+		break;
+	case RuntimeCoordinatorTransientOscInvalidation::None:
+	default:
+		break;
+	}
+
+	mRenderEngine.ApplyRuntimeCoordinatorRenderReset(result.renderResetScope);
+	if (result.renderResetScope != RuntimeCoordinatorRenderResetScope::None)
+		++mPendingCoordinatorRenderResetEvents;
+
+	if (result.shaderBuildRequested)
+	{
+		RequestShaderBuild();
+		++mPendingCoordinatorShaderBuildEvents;
+	}
+
+	if (result.runtimeStateBroadcastRequired)
+		BroadcastRuntimeState();
+
+	return true;
+}
+
+bool RuntimeUpdateController::ProcessRuntimeWork()
+{
+	DispatchRuntimeEvents();
+
+	return ConsumeReadyShaderBuild(0, true, true);
+}
+
+void RuntimeUpdateController::RequestShaderBuild()
+{
+	mShaderBuildQueue.RequestBuild(mVideoBackend.InputFrameWidth(), mVideoBackend.InputFrameHeight());
+}
+
+void RuntimeUpdateController::BroadcastRuntimeState()
+{
+	RuntimeStateBroadcastRequestedEvent event;
+	event.reason = "runtime-state-changed";
+	if (!mRuntimeEventDispatcher.PublishPayload(event, "RuntimeUpdateController"))
+	{
+		mRuntimeServices.BroadcastState();
+		return;
+	}
+
+	DispatchRuntimeEvents();
+}
+
+void RuntimeUpdateController::HandleRuntimeStateBroadcastRequested(const RuntimeEvent& event)
+{
+	if (event.source == "ControlServices")
+		return;
+
+	mRuntimeServices.BroadcastState();
+}
+
+void RuntimeUpdateController::HandleRuntimeReloadRequested(const RuntimeEvent& event)
+{
+	const RuntimeReloadRequestedEvent* payload = std::get_if<RuntimeReloadRequestedEvent>(&event.payload);
+	if (!payload)
+		return;
+
+	mRuntimeStore.ClearReloadRequest();
+}
+
+void RuntimeUpdateController::HandleRuntimePersistenceRequested(const RuntimeEvent& event)
+{
+	const RuntimePersistenceRequestedEvent* payload = std::get_if<RuntimePersistenceRequestedEvent>(&event.payload);
+	if (!payload)
+		return;
+
+	std::string error;
+	mRuntimeStore.RequestPersistence(payload->request, error);
+}
+
+void RuntimeUpdateController::HandleShaderBuildRequested(const RuntimeEvent& event)
+{
+	const ShaderBuildEvent* payload = std::get_if<ShaderBuildEvent>(&event.payload);
+	if (!payload || payload->phase != RuntimeEventShaderBuildPhase::Requested)
+		return;
+	if (ShouldSuppressCoordinatorFollowUp(event, mPendingCoordinatorShaderBuildEvents))
+		return;
+
+	RequestShaderBuild();
+}
+
+void RuntimeUpdateController::HandleShaderBuildPrepared(const RuntimeEvent& event)
+{
+	const ShaderBuildEvent* payload = std::get_if<ShaderBuildEvent>(&event.payload);
+	if (!payload || payload->phase != RuntimeEventShaderBuildPhase::Prepared)
+		return;
+
+	ConsumeReadyShaderBuild(payload->generation, false, true);
+}
+
+void RuntimeUpdateController::HandleShaderBuildFailed(const RuntimeEvent& event)
+{
+	const ShaderBuildEvent* payload = std::get_if<ShaderBuildEvent>(&event.payload);
+	if (!payload || payload->phase != RuntimeEventShaderBuildPhase::Failed)
+		return;
+
+	ConsumeReadyShaderBuild(payload->generation, false, false);
+}
+
+void RuntimeUpdateController::HandleCompileStatusChanged(const RuntimeEvent& event)
+{
+	const CompileStatusChangedEvent* payload = std::get_if<CompileStatusChangedEvent>(&event.payload);
+	if (!payload)
+		return;
+	if (ShouldSuppressCoordinatorFollowUp(event, mPendingCoordinatorCompileStatusEvents))
+		return;
+
+	mRuntimeStore.SetCompileStatus(payload->succeeded, payload->message);
+}
+
+void RuntimeUpdateController::HandleRenderResetRequested(const RuntimeEvent& event)
+{
+	const RenderResetEvent* payload = std::get_if<RenderResetEvent>(&event.payload);
+	if (!payload || payload->applied)
+		return;
+	if (ShouldSuppressCoordinatorFollowUp(event, mPendingCoordinatorRenderResetEvents))
+		return;
+
+	mRenderEngine.ApplyRuntimeCoordinatorRenderReset(ToRuntimeCoordinatorRenderResetScope(payload->scope));
+}
+
+bool RuntimeUpdateController::ConsumeReadyShaderBuild(uint64_t expectedGeneration, bool publishPreparedEvent, bool publishFailureEvent)
+{
+	PreparedShaderBuild readyBuild;
+	const bool consumed = expectedGeneration == 0
+		? mShaderBuildQueue.TryConsumeReadyBuild(readyBuild)
+		: mShaderBuildQueue.TryConsumeReadyBuild(expectedGeneration, readyBuild);
+	if (!consumed)
+		return true;
+
+	const unsigned inputWidth = mVideoBackend.InputFrameWidth();
+	const unsigned inputHeight = mVideoBackend.InputFrameHeight();
+	if (!readyBuild.succeeded)
+	{
+		if (publishFailureEvent)
+		{
+			PublishShaderBuildLifecycleEvent(
+				RuntimeEventShaderBuildPhase::Failed,
+				readyBuild.generation,
+				inputWidth,
+				inputHeight,
+				false,
+				readyBuild.message);
+			DispatchRuntimeEvents();
+		}
+		ApplyRuntimeCoordinatorResult(mRuntimeCoordinator.HandlePreparedShaderBuildFailure(readyBuild.message));
+		return false;
+	}
+
+	if (publishPreparedEvent)
+	{
+		PublishShaderBuildLifecycleEvent(
+			RuntimeEventShaderBuildPhase::Prepared,
+			readyBuild.generation,
+			inputWidth,
+			inputHeight,
+			true,
+			readyBuild.message);
+		DispatchRuntimeEvents();
+	}
+
+	char compilerErrorMessage[1024] = {};
+	if (!mRenderEngine.ApplyPreparedShaderBuild(
+		readyBuild,
+		inputWidth,
+		inputHeight,
+		mRuntimeCoordinator.PreserveFeedbackOnNextShaderBuild(),
+		sizeof(compilerErrorMessage),
+		compilerErrorMessage))
+	{
+		const std::string errorMessage = compilerErrorMessage;
+		if (publishFailureEvent)
+		{
+			PublishShaderBuildLifecycleEvent(
+				RuntimeEventShaderBuildPhase::Failed,
+				readyBuild.generation,
+				inputWidth,
+				inputHeight,
+				false,
+				errorMessage);
+			DispatchRuntimeEvents();
+		}
+		ApplyRuntimeCoordinatorResult(mRuntimeCoordinator.HandlePreparedShaderBuildFailure(errorMessage));
+		return false;
+	}
+
+	PublishShaderBuildLifecycleEvent(
+		RuntimeEventShaderBuildPhase::Applied,
+		readyBuild.generation,
+		inputWidth,
+		inputHeight,
+		true,
+		"Shader layers applied successfully.");
+	ApplyRuntimeCoordinatorResult(mRuntimeCoordinator.HandlePreparedShaderBuildSuccess());
+	return true;
+}
+
+void RuntimeUpdateController::PublishShaderBuildLifecycleEvent(
+	RuntimeEventShaderBuildPhase phase,
+	uint64_t generation,
+	unsigned inputWidth,
+	unsigned inputHeight,
+	bool succeeded,
+	const std::string& message)
+{
+	ShaderBuildEvent event;
+	event.phase = phase;
+	event.generation = generation;
+	event.inputWidth = inputWidth;
+	event.inputHeight = inputHeight;
+	event.preserveFeedbackState = mRuntimeCoordinator.PreserveFeedbackOnNextShaderBuild();
+	event.succeeded = succeeded;
+	event.message = message;
+	mRuntimeEventDispatcher.PublishPayload(event, "RuntimeUpdateController");
+}
+
+bool RuntimeUpdateController::ShouldSuppressCoordinatorFollowUp(const RuntimeEvent& event, std::size_t& pendingSuppressions)
+{
+	if (event.source != "RuntimeCoordinator")
+		return false;
+
+	if (pendingSuppressions > 0)
+		--pendingSuppressions;
+	return true;
+}
+
+RuntimeEventDispatchResult RuntimeUpdateController::DispatchRuntimeEvents(std::size_t maxEvents)
+{
+	RuntimeEventDispatchResult result = mRuntimeEventDispatcher.DispatchPending(maxEvents);
+	const RuntimeEventQueueMetrics queueMetrics = mRuntimeEventDispatcher.GetQueueMetrics();
+	HealthTelemetry& telemetry = mRuntimeStore.GetHealthTelemetry();
+	telemetry.TryRecordRuntimeEventDispatchStats(
+		result.dispatchedEvents,
+		result.handlerInvocations,
+		result.handlerFailures,
+		result.dispatchDurationMilliseconds);
+	telemetry.TryRecordRuntimeEventQueueMetrics(
+		"runtime-events",
+		queueMetrics.depth,
+		queueMetrics.capacity,
+		static_cast<uint64_t>(queueMetrics.droppedCount),
+		queueMetrics.oldestEventAgeMilliseconds);
+	PublishRuntimeEventHealthObservations(result);
+	return result;
+}
+
+void RuntimeUpdateController::PublishRuntimeEventHealthObservations(const RuntimeEventDispatchResult& result)
+{
+	const RuntimeEventQueueMetrics queueMetrics = mRuntimeEventDispatcher.GetQueueMetrics();
+	if (queueMetrics.depth != mLastReportedRuntimeEventQueueDepth ||
+		queueMetrics.droppedCount != mLastReportedRuntimeEventDroppedCount ||
+		queueMetrics.coalescedCount != mLastReportedRuntimeEventCoalescedCount)
+	{
+		QueueDepthChangedEvent queueDepth;
+		queueDepth.queueName = "runtime-events";
+		queueDepth.depth = queueMetrics.depth;
+		queueDepth.capacity = queueMetrics.capacity;
+		queueDepth.droppedCount = queueMetrics.droppedCount;
+		queueDepth.coalescedCount = queueMetrics.coalescedCount;
+		mRuntimeEventDispatcher.PublishPayload(queueDepth, "HealthTelemetry");
+		mLastReportedRuntimeEventQueueDepth = queueMetrics.depth;
+		mLastReportedRuntimeEventDroppedCount = queueMetrics.droppedCount;
+		mLastReportedRuntimeEventCoalescedCount = queueMetrics.coalescedCount;
+	}
+
+	if (result.handlerInvocations == 0 && result.handlerFailures == 0)
+		return;
+
+	TimingSampleRecordedEvent timing;
+	timing.subsystem = "RuntimeEventDispatcher";
+	timing.metric = "dispatchDuration";
+	timing.value = result.dispatchDurationMilliseconds;
+	timing.unit = "ms";
+	mRuntimeEventDispatcher.PublishPayload(timing, "HealthTelemetry");
+}

apps/LoopThroughWithOpenGLCompositing/gl/frame/RuntimeUpdateController.h

@@ -0,0 +1,70 @@
+#pragma once
+
+#include "RuntimeCoordinator.h"
+#include "RuntimeEventPayloads.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
+class RenderEngine;
+struct RuntimeEvent;
+struct RuntimeEventDispatchResult;
+class RuntimeEventDispatcher;
+class RuntimeServices;
+class RuntimeStore;
+class ShaderBuildQueue;
+class VideoBackend;
+
+class RuntimeUpdateController
+{
+public:
+	RuntimeUpdateController(
+		RuntimeStore& runtimeStore,
+		RuntimeCoordinator& runtimeCoordinator,
+		RuntimeEventDispatcher& runtimeEventDispatcher,
+		RuntimeServices& runtimeServices,
+		RenderEngine& renderEngine,
+		ShaderBuildQueue& shaderBuildQueue,
+		VideoBackend& videoBackend);
+
+	bool ApplyRuntimeCoordinatorResult(const RuntimeCoordinatorResult& result, std::string* error = nullptr);
+	bool ProcessRuntimeWork();
+	void RequestShaderBuild();
+	void BroadcastRuntimeState();
+
+private:
+	void HandleRuntimeStateBroadcastRequested(const RuntimeEvent& event);
+	void HandleRuntimeReloadRequested(const RuntimeEvent& event);
+	void HandleRuntimePersistenceRequested(const RuntimeEvent& event);
+	void HandleShaderBuildRequested(const RuntimeEvent& event);
+	void HandleShaderBuildPrepared(const RuntimeEvent& event);
+	void HandleShaderBuildFailed(const RuntimeEvent& event);
+	void HandleCompileStatusChanged(const RuntimeEvent& event);
+	void HandleRenderResetRequested(const RuntimeEvent& event);
+	bool ConsumeReadyShaderBuild(uint64_t expectedGeneration, bool publishPreparedEvent, bool publishFailureEvent);
+	void PublishShaderBuildLifecycleEvent(
+		RuntimeEventShaderBuildPhase phase,
+		uint64_t generation,
+		unsigned inputWidth,
+		unsigned inputHeight,
+		bool succeeded,
+		const std::string& message);
+	bool ShouldSuppressCoordinatorFollowUp(const RuntimeEvent& event, std::size_t& pendingSuppressions);
+	RuntimeEventDispatchResult DispatchRuntimeEvents(std::size_t maxEvents = 0);
+	void PublishRuntimeEventHealthObservations(const RuntimeEventDispatchResult& result);
+
+	RuntimeStore& mRuntimeStore;
+	RuntimeCoordinator& mRuntimeCoordinator;
+	RuntimeEventDispatcher& mRuntimeEventDispatcher;
+	RuntimeServices& mRuntimeServices;
+	RenderEngine& mRenderEngine;
+	ShaderBuildQueue& mShaderBuildQueue;
+	VideoBackend& mVideoBackend;
+	std::size_t mPendingCoordinatorShaderBuildEvents = 0;
+	std::size_t mPendingCoordinatorCompileStatusEvents = 0;
+	std::size_t mPendingCoordinatorRenderResetEvents = 0;
+	std::size_t mLastReportedRuntimeEventQueueDepth = static_cast<std::size_t>(-1);
+	std::size_t mLastReportedRuntimeEventDroppedCount = static_cast<std::size_t>(-1);
+	std::size_t mLastReportedRuntimeEventCoalescedCount = static_cast<std::size_t>(-1);
+};

apps/LoopThroughWithOpenGLCompositing/gl/pipeline/OpenGLRenderPipeline.cpp

@@ -1,25 +1,32 @@
 #include "OpenGLRenderPipeline.h"
 
+#include "HealthTelemetry.h"
 #include "OpenGLRenderer.h"
-#include "RuntimeHost.h"
+#include "RuntimeSnapshotProvider.h"
 #include "VideoIOFormat.h"
 
 #include <cstring>
 
 #include <chrono>
+#include <cstdlib>
 #include <gl/gl.h>
+#include <string>
 
 OpenGLRenderPipeline::OpenGLRenderPipeline(
 	OpenGLRenderer& renderer,
-	RuntimeHost& runtimeHost,
+	RuntimeSnapshotProvider& runtimeSnapshotProvider,
+	HealthTelemetry& healthTelemetry,
 	RenderEffectCallback renderEffect,
 	OutputReadyCallback outputReady,
 	PaintCallback paint) :
 	mRenderer(renderer),
-	mRuntimeHost(runtimeHost),
+	mRuntimeSnapshotProvider(runtimeSnapshotProvider),
+	mHealthTelemetry(healthTelemetry),
 	mRenderEffect(renderEffect),
 	mOutputReady(outputReady),
-	mPaint(paint)
+	mPaint(paint),
+	mOutputReadbackMode(ReadOutputReadbackModeFromEnvironment()),
+	mAsyncReadbackDepth(ReadAsyncReadbackDepthFromEnvironment())
 {
 }
 
@@ -41,22 +48,55 @@ bool OpenGLRenderPipeline::RenderFrame(const RenderPipelineFrameContext& context
 	glBindFramebuffer(GL_FRAMEBUFFER, mRenderer.OutputFramebuffer());
 	if (mOutputReady)
 		mOutputReady();
-	if (state.outputPixelFormat == VideoIOPixelFormat::V210 || state.outputPixelFormat == VideoIOPixelFormat::Yuva10)
+	if (state.outputPixelFormat == VideoIOPixelFormat::Bgra8)
+		PackOutputForBgra8(state);
+	else if (state.outputPixelFormat == VideoIOPixelFormat::V210 || state.outputPixelFormat == VideoIOPixelFormat::Yuva10)
 		PackOutputFor10Bit(state);
 	glFlush();
 
 	const auto renderEndTime = std::chrono::steady_clock::now();
 	const double renderMilliseconds = std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(renderEndTime - renderStartTime).count();
-	mRuntimeHost.TrySetPerformanceStats(state.frameBudgetMilliseconds, renderMilliseconds);
-	mRuntimeHost.TryAdvanceFrame();
+	mHealthTelemetry.TryRecordPerformanceStats(state.frameBudgetMilliseconds, renderMilliseconds);
+	mRuntimeSnapshotProvider.AdvanceFrame();
 
-	ReadOutputFrame(state, outputFrame);
-	if (mPaint)
-		mPaint();
+	OutputReadbackTiming readbackTiming = ReadOutputFrame(state, outputFrame);
+	mHealthTelemetry.TryRecordOutputRenderPipelineTiming(
+		renderMilliseconds,
+		readbackTiming.fenceWaitMilliseconds,
+		readbackTiming.mapMilliseconds,
+		readbackTiming.copyMilliseconds,
+		readbackTiming.cachedCopyMilliseconds,
+		readbackTiming.asyncQueueMilliseconds,
+		readbackTiming.asyncQueueBufferMilliseconds,
+		readbackTiming.asyncQueueSetupMilliseconds,
+		readbackTiming.asyncQueueReadPixelsMilliseconds,
+		readbackTiming.asyncQueueFenceMilliseconds,
+		readbackTiming.syncReadMilliseconds,
+		readbackTiming.asyncReadbackMissed,
+		readbackTiming.cachedFallbackUsed,
+		readbackTiming.syncFallbackUsed);
 
 	return true;
 }
 
+void OpenGLRenderPipeline::PackOutputForBgra8(const VideoIOState& state)
+{
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, mRenderer.OutputFramebuffer());
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, mRenderer.OutputPackFramebuffer());
+	glBlitFramebuffer(
+		0,
+		0,
+		state.outputFrameSize.width,
+		state.outputFrameSize.height,
+		0,
+		0,
+		state.outputFrameSize.width,
+		state.outputFrameSize.height,
+		GL_COLOR_BUFFER_BIT,
+		GL_NEAREST);
+	glBindFramebuffer(GL_FRAMEBUFFER, mRenderer.OutputPackFramebuffer());
+}
+
 void OpenGLRenderPipeline::PackOutputFor10Bit(const VideoIOState& state)
 {
 	glBindFramebuffer(GL_FRAMEBUFFER, mRenderer.OutputPackFramebuffer());
@@ -90,11 +130,17 @@ bool OpenGLRenderPipeline::EnsureAsyncReadbackBuffers(std::size_t requiredBytes)
 	if (requiredBytes == 0)
 		return false;
 
-	if (mAsyncReadbackBytes == requiredBytes && mAsyncReadbackSlots[0].pixelPackBuffer != 0)
+	if (mAsyncReadbackBytes == requiredBytes &&
+		mAsyncReadbackSlots.size() == mAsyncReadbackDepth &&
+		!mAsyncReadbackSlots.empty() &&
+		mAsyncReadbackSlots[0].pixelPackBuffer != 0)
+	{
 		return true;
+	}
 
 	ResetAsyncReadbackState();
 	mAsyncReadbackBytes = requiredBytes;
+	mAsyncReadbackSlots.resize(mAsyncReadbackDepth);
 	for (AsyncReadbackSlot& slot : mAsyncReadbackSlots)
 	{
 		glGenBuffers(1, &slot.pixelPackBuffer);
@@ -115,7 +161,7 @@ void OpenGLRenderPipeline::ResetAsyncReadbackState()
 	for (AsyncReadbackSlot& slot : mAsyncReadbackSlots)
 		slot.sizeBytes = 0;
 
-	if (mAsyncReadbackSlots[0].pixelPackBuffer != 0)
+	if (!mAsyncReadbackSlots.empty() && mAsyncReadbackSlots[0].pixelPackBuffer != 0)
 	{
 		for (AsyncReadbackSlot& slot : mAsyncReadbackSlots)
 		{
@@ -130,6 +176,7 @@ void OpenGLRenderPipeline::ResetAsyncReadbackState()
 	mAsyncReadbackWriteIndex = 0;
 	mAsyncReadbackReadIndex = 0;
 	mAsyncReadbackBytes = 0;
+	mAsyncReadbackSlots.clear();
 }
 
 void OpenGLRenderPipeline::FlushAsyncReadbackPipeline()
@@ -148,18 +195,29 @@ void OpenGLRenderPipeline::FlushAsyncReadbackPipeline()
 	mAsyncReadbackReadIndex = 0;
 }
 
-void OpenGLRenderPipeline::QueueAsyncReadback(const VideoIOState& state)
+bool OpenGLRenderPipeline::QueueAsyncReadback(const VideoIOState& state, OutputReadbackTiming& timing)
 {
-	const bool usePackedOutput = state.outputPixelFormat == VideoIOPixelFormat::V210 || state.outputPixelFormat == VideoIOPixelFormat::Yuva10;
+	const auto queueStartTime = std::chrono::steady_clock::now();
+	const bool useTenBitPackedOutput = state.outputPixelFormat == VideoIOPixelFormat::V210 ||
+		state.outputPixelFormat == VideoIOPixelFormat::Yuva10;
+	const bool usePackFramebuffer = state.outputPixelFormat == VideoIOPixelFormat::Bgra8 || useTenBitPackedOutput;
 	const std::size_t requiredBytes = static_cast<std::size_t>(state.outputFrameRowBytes) * state.outputFrameSize.height;
-	const GLenum format = usePackedOutput ? GL_RGBA : GL_BGRA;
-	const GLenum type = usePackedOutput ? GL_UNSIGNED_BYTE : GL_UNSIGNED_INT_8_8_8_8_REV;
-	const GLuint framebuffer = usePackedOutput ? mRenderer.OutputPackFramebuffer() : mRenderer.OutputFramebuffer();
-	const GLsizei readWidth = static_cast<GLsizei>(usePackedOutput ? state.outputPackTextureWidth : state.outputFrameSize.width);
+	const GLenum format = useTenBitPackedOutput ? GL_RGBA : GL_BGRA;
+	const GLenum type = useTenBitPackedOutput ? GL_UNSIGNED_BYTE : GL_UNSIGNED_INT_8_8_8_8_REV;
+	const GLuint framebuffer = usePackFramebuffer ? mRenderer.OutputPackFramebuffer() : mRenderer.OutputFramebuffer();
+	const GLsizei readWidth = static_cast<GLsizei>(useTenBitPackedOutput ? state.outputPackTextureWidth : state.outputFrameSize.width);
 	const GLsizei readHeight = static_cast<GLsizei>(state.outputFrameSize.height);
 
+	const auto finishTiming = [&timing, queueStartTime]() {
+		const auto queueEndTime = std::chrono::steady_clock::now();
+		timing.asyncQueueMilliseconds += std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(queueEndTime - queueStartTime).count();
+	};
+
 	if (requiredBytes == 0)
-		return;
+	{
+		finishTiming();
+		return false;
+	}
 
 	if (mAsyncReadbackBytes != requiredBytes
 		|| mAsyncReadbackFormat != format
@@ -170,30 +228,56 @@ void OpenGLRenderPipeline::QueueAsyncReadback(const VideoIOState& state)
 		mAsyncReadbackType = type;
 		mAsyncReadbackFramebuffer = framebuffer;
 		if (!EnsureAsyncReadbackBuffers(requiredBytes))
-			return;
+		{
+			finishTiming();
+			return false;
+		}
+	}
+
+	if (mAsyncReadbackSlots.empty())
+	{
+		finishTiming();
+		return false;
 	}
 
 	AsyncReadbackSlot& slot = mAsyncReadbackSlots[mAsyncReadbackWriteIndex];
-	if (slot.fence != nullptr)
+	if (slot.inFlight)
 	{
-		glDeleteSync(slot.fence);
-		slot.fence = nullptr;
+		finishTiming();
+		return false;
 	}
 
+	auto stageStartTime = std::chrono::steady_clock::now();
 	glPixelStorei(GL_PACK_ALIGNMENT, 4);
 	glPixelStorei(GL_PACK_ROW_LENGTH, 0);
 	glBindFramebuffer(GL_READ_FRAMEBUFFER, framebuffer);
 	glBindBuffer(GL_PIXEL_PACK_BUFFER, slot.pixelPackBuffer);
+	auto stageEndTime = std::chrono::steady_clock::now();
+	timing.asyncQueueSetupMilliseconds += std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(stageEndTime - stageStartTime).count();
+
+	stageStartTime = std::chrono::steady_clock::now();
 	glBufferData(GL_PIXEL_PACK_BUFFER, static_cast<GLsizeiptr>(requiredBytes), nullptr, GL_STREAM_READ);
+	stageEndTime = std::chrono::steady_clock::now();
+	timing.asyncQueueBufferMilliseconds += std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(stageEndTime - stageStartTime).count();
+
+	stageStartTime = std::chrono::steady_clock::now();
 	glReadPixels(0, 0, readWidth, readHeight, format, type, nullptr);
+	stageEndTime = std::chrono::steady_clock::now();
+	timing.asyncQueueReadPixelsMilliseconds += std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(stageEndTime - stageStartTime).count();
+
+	stageStartTime = std::chrono::steady_clock::now();
 	slot.fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
+	stageEndTime = std::chrono::steady_clock::now();
+	timing.asyncQueueFenceMilliseconds += std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(stageEndTime - stageStartTime).count();
 	slot.inFlight = slot.fence != nullptr;
 	glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
 
 	mAsyncReadbackWriteIndex = (mAsyncReadbackWriteIndex + 1) % mAsyncReadbackSlots.size();
+	finishTiming();
+	return slot.inFlight;
 }
 
-bool OpenGLRenderPipeline::TryConsumeAsyncReadback(VideoIOOutputFrame& outputFrame, GLuint64 timeoutNanoseconds)
+bool OpenGLRenderPipeline::TryConsumeAsyncReadback(VideoIOOutputFrame& outputFrame, GLuint64 timeoutNanoseconds, OutputReadbackTiming& timing)
 {
 	if (mAsyncReadbackBytes == 0 || outputFrame.bytes == nullptr)
 		return false;
@@ -203,15 +287,24 @@ bool OpenGLRenderPipeline::TryConsumeAsyncReadback(VideoIOOutputFrame& outputFra
 		return false;
 
 	const GLenum waitFlags = timeoutNanoseconds > 0 ? GL_SYNC_FLUSH_COMMANDS_BIT : 0;
+	const auto waitStartTime = std::chrono::steady_clock::now();
 	const GLenum waitResult = glClientWaitSync(slot.fence, waitFlags, timeoutNanoseconds);
+	const auto waitEndTime = std::chrono::steady_clock::now();
+	timing.fenceWaitMilliseconds += std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(waitEndTime - waitStartTime).count();
 	if (waitResult != GL_ALREADY_SIGNALED && waitResult != GL_CONDITION_SATISFIED)
+	{
+		timing.asyncReadbackMissed = true;
 		return false;
+	}
 
 	glDeleteSync(slot.fence);
 	slot.fence = nullptr;
 
 	glBindBuffer(GL_PIXEL_PACK_BUFFER, slot.pixelPackBuffer);
+	const auto mapStartTime = std::chrono::steady_clock::now();
 	void* mappedBytes = glMapBuffer(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY);
+	const auto mapEndTime = std::chrono::steady_clock::now();
+	timing.mapMilliseconds += std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(mapEndTime - mapStartTime).count();
 	if (mappedBytes == nullptr)
 	{
 		glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
@@ -220,7 +313,10 @@ bool OpenGLRenderPipeline::TryConsumeAsyncReadback(VideoIOOutputFrame& outputFra
 		return false;
 	}
 
+	const auto copyStartTime = std::chrono::steady_clock::now();
 	std::memcpy(outputFrame.bytes, mappedBytes, slot.sizeBytes);
+	const auto copyEndTime = std::chrono::steady_clock::now();
+	timing.copyMilliseconds += std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(copyEndTime - copyStartTime).count();
 	glUnmapBuffer(GL_PIXEL_PACK_BUFFER);
 	glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
 
@@ -240,40 +336,144 @@ void OpenGLRenderPipeline::CacheOutputFrame(const VideoIOOutputFrame& outputFram
 	std::memcpy(mCachedOutputFrame.data(), outputFrame.bytes, byteCount);
 }
 
-void OpenGLRenderPipeline::ReadOutputFrameSynchronously(const VideoIOState& state, void* destinationBytes)
+bool OpenGLRenderPipeline::TryCopyCachedOutputFrame(VideoIOOutputFrame& outputFrame, OutputReadbackTiming& timing) const
 {
+	if (outputFrame.bytes == nullptr || outputFrame.height == 0 || outputFrame.rowBytes <= 0)
+		return false;
+
+	const std::size_t byteCount = static_cast<std::size_t>(outputFrame.rowBytes) * outputFrame.height;
+	if (mCachedOutputFrame.size() != byteCount)
+		return false;
+
+	const auto copyStartTime = std::chrono::steady_clock::now();
+	std::memcpy(outputFrame.bytes, mCachedOutputFrame.data(), byteCount);
+	const auto copyEndTime = std::chrono::steady_clock::now();
+	timing.cachedCopyMilliseconds += std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(copyEndTime - copyStartTime).count();
+	timing.cachedFallbackUsed = true;
+	return true;
+}
+
+void OpenGLRenderPipeline::ReadOutputFrameSynchronously(const VideoIOState& state, void* destinationBytes, OutputReadbackTiming& timing)
+{
+	const auto readStartTime = std::chrono::steady_clock::now();
 	const bool usePackedOutput = state.outputPixelFormat == VideoIOPixelFormat::V210 || state.outputPixelFormat == VideoIOPixelFormat::Yuva10;
+	const bool usePackFramebuffer = state.outputPixelFormat == VideoIOPixelFormat::Bgra8 || usePackedOutput;
 
 	glPixelStorei(GL_PACK_ALIGNMENT, 4);
 	glPixelStorei(GL_PACK_ROW_LENGTH, 0);
-	if (usePackedOutput)
+	if (usePackFramebuffer)
 	{
 		glBindFramebuffer(GL_READ_FRAMEBUFFER, mRenderer.OutputPackFramebuffer());
-		glReadPixels(0, 0, state.outputPackTextureWidth, state.outputFrameSize.height, GL_RGBA, GL_UNSIGNED_BYTE, destinationBytes);
+		if (usePackedOutput)
+			glReadPixels(0, 0, state.outputPackTextureWidth, state.outputFrameSize.height, GL_RGBA, GL_UNSIGNED_BYTE, destinationBytes);
+		else
+			glReadPixels(0, 0, state.outputFrameSize.width, state.outputFrameSize.height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, destinationBytes);
 	}
 	else
 	{
 		glBindFramebuffer(GL_READ_FRAMEBUFFER, mRenderer.OutputFramebuffer());
 		glReadPixels(0, 0, state.outputFrameSize.width, state.outputFrameSize.height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, destinationBytes);
 	}
+	const auto readEndTime = std::chrono::steady_clock::now();
+	timing.syncReadMilliseconds += std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(readEndTime - readStartTime).count();
+	timing.syncFallbackUsed = true;
 }
 
-void OpenGLRenderPipeline::ReadOutputFrame(const VideoIOState& state, VideoIOOutputFrame& outputFrame)
+OpenGLRenderPipeline::OutputReadbackTiming OpenGLRenderPipeline::ReadOutputFrame(const VideoIOState& state, VideoIOOutputFrame& outputFrame)
 {
-	if (TryConsumeAsyncReadback(outputFrame, 500000))
+	OutputReadbackTiming timing;
+
+	if (mOutputReadbackMode == OutputReadbackMode::Synchronous)
 	{
-		QueueAsyncReadback(state);
-		return;
+		if (outputFrame.bytes != nullptr)
+		{
+			ReadOutputFrameSynchronously(state, outputFrame.bytes, timing);
+			CacheOutputFrame(outputFrame);
+		}
+		return timing;
 	}
 
-	// If async readback misses the playout deadline, prefer a fresh synchronous
-	// frame over reusing stale cached output, then restart the async pipeline.
-	if (outputFrame.bytes != nullptr)
+	if (mOutputReadbackMode == OutputReadbackMode::CachedOnly)
 	{
-		ReadOutputFrameSynchronously(state, outputFrame.bytes);
+		if (TryCopyCachedOutputFrame(outputFrame, timing))
+			return timing;
+
+		if (outputFrame.bytes != nullptr)
+		{
+			ReadOutputFrameSynchronously(state, outputFrame.bytes, timing);
+			CacheOutputFrame(outputFrame);
+		}
+		return timing;
+	}
+
+	if (TryConsumeAsyncReadback(outputFrame, 0, timing))
+	{
+		(void)QueueAsyncReadback(state, timing);
+		return timing;
+	}
+
+	const bool queued = QueueAsyncReadback(state, timing);
+
+	if (queued && TryConsumeAsyncReadback(outputFrame, 0, timing))
+		return timing;
+
+	if (TryCopyCachedOutputFrame(outputFrame, timing))
+	{
+		return timing;
+	}
+
+	// Bootstrap only: until the first async readback has produced cached output,
+	// use one synchronous readback so DeckLink has a valid frame to schedule.
+	if (outputFrame.bytes != nullptr && mCachedOutputFrame.empty())
+	{
+		ReadOutputFrameSynchronously(state, outputFrame.bytes, timing);
 		CacheOutputFrame(outputFrame);
 	}
 
-	FlushAsyncReadbackPipeline();
-	QueueAsyncReadback(state);
+	if (!queued)
+		(void)QueueAsyncReadback(state, timing);
+	return timing;
+}
+
+OpenGLRenderPipeline::OutputReadbackMode OpenGLRenderPipeline::ReadOutputReadbackModeFromEnvironment()
+{
+	char* mode = nullptr;
+	std::size_t modeSize = 0;
+	if (_dupenv_s(&mode, &modeSize, "VST_OUTPUT_READBACK_MODE") != 0 || mode == nullptr)
+		return OutputReadbackMode::AsyncPbo;
+
+	const std::string modeValue(mode);
+	std::free(mode);
+	if (modeValue == "async_pbo")
+		return OutputReadbackMode::AsyncPbo;
+	if (modeValue == "sync")
+		return OutputReadbackMode::Synchronous;
+	if (modeValue == "cached_only")
+		return OutputReadbackMode::CachedOnly;
+
+	return OutputReadbackMode::AsyncPbo;
+}
+
+std::size_t OpenGLRenderPipeline::ReadAsyncReadbackDepthFromEnvironment()
+{
+	char* depthValue = nullptr;
+	std::size_t depthValueSize = 0;
+	if (_dupenv_s(&depthValue, &depthValueSize, "VST_OUTPUT_READBACK_DEPTH") != 0 || depthValue == nullptr)
+		return 6;
+
+	const std::string value(depthValue);
+	std::free(depthValue);
+	try
+	{
+		const unsigned long requestedDepth = std::stoul(value);
+		if (requestedDepth < 3)
+			return 3;
+		if (requestedDepth > 12)
+			return 12;
+		return static_cast<std::size_t>(requestedDepth);
+	}
+	catch (...)
+	{
+		return 6;
+	}
 }

apps/LoopThroughWithOpenGLCompositing/gl/pipeline/OpenGLRenderPipeline.h

@@ -3,12 +3,12 @@
 #include "GLExtensions.h"
 #include "VideoIOTypes.h"
 
-#include <array>
 #include <functional>
 #include <vector>
 
 class OpenGLRenderer;
-class RuntimeHost;
+class HealthTelemetry;
+class RuntimeSnapshotProvider;
 
 struct RenderPipelineFrameContext
 {
@@ -25,7 +25,8 @@ public:
 
 	OpenGLRenderPipeline(
 		OpenGLRenderer& renderer,
-		RuntimeHost& runtimeHost,
+		RuntimeSnapshotProvider& runtimeSnapshotProvider,
+		HealthTelemetry& healthTelemetry,
 		RenderEffectCallback renderEffect,
 		OutputReadyCallback outputReady,
 		PaintCallback paint);
@@ -34,6 +35,13 @@ public:
 	bool RenderFrame(const RenderPipelineFrameContext& context, VideoIOOutputFrame& outputFrame);
 
 private:
+	enum class OutputReadbackMode
+	{
+		AsyncPbo,
+		Synchronous,
+		CachedOnly
+	};
+
 	struct AsyncReadbackSlot
 	{
 		GLuint pixelPackBuffer = 0;
@@ -42,22 +50,46 @@ private:
 		bool inFlight = false;
 	};
 
+	struct OutputReadbackTiming
+	{
+		double fenceWaitMilliseconds = 0.0;
+		double mapMilliseconds = 0.0;
+		double copyMilliseconds = 0.0;
+		double cachedCopyMilliseconds = 0.0;
+		double asyncQueueMilliseconds = 0.0;
+		double asyncQueueBufferMilliseconds = 0.0;
+		double asyncQueueSetupMilliseconds = 0.0;
+		double asyncQueueReadPixelsMilliseconds = 0.0;
+		double asyncQueueFenceMilliseconds = 0.0;
+		double syncReadMilliseconds = 0.0;
+		bool asyncReadbackMissed = false;
+		bool cachedFallbackUsed = false;
+		bool syncFallbackUsed = false;
+	};
+
 	bool EnsureAsyncReadbackBuffers(std::size_t requiredBytes);
 	void ResetAsyncReadbackState();
 	void FlushAsyncReadbackPipeline();
-	void QueueAsyncReadback(const VideoIOState& state);
-	bool TryConsumeAsyncReadback(VideoIOOutputFrame& outputFrame, GLuint64 timeoutNanoseconds);
+	bool QueueAsyncReadback(const VideoIOState& state, OutputReadbackTiming& timing);
+	bool TryConsumeAsyncReadback(VideoIOOutputFrame& outputFrame, GLuint64 timeoutNanoseconds, OutputReadbackTiming& timing);
 	void CacheOutputFrame(const VideoIOOutputFrame& outputFrame);
-	void ReadOutputFrameSynchronously(const VideoIOState& state, void* destinationBytes);
+	bool TryCopyCachedOutputFrame(VideoIOOutputFrame& outputFrame, OutputReadbackTiming& timing) const;
+	void ReadOutputFrameSynchronously(const VideoIOState& state, void* destinationBytes, OutputReadbackTiming& timing);
+	void PackOutputForBgra8(const VideoIOState& state);
 	void PackOutputFor10Bit(const VideoIOState& state);
-	void ReadOutputFrame(const VideoIOState& state, VideoIOOutputFrame& outputFrame);
+	OutputReadbackTiming ReadOutputFrame(const VideoIOState& state, VideoIOOutputFrame& outputFrame);
+	static OutputReadbackMode ReadOutputReadbackModeFromEnvironment();
+	static std::size_t ReadAsyncReadbackDepthFromEnvironment();
 
 	OpenGLRenderer& mRenderer;
-	RuntimeHost& mRuntimeHost;
+	RuntimeSnapshotProvider& mRuntimeSnapshotProvider;
+	HealthTelemetry& mHealthTelemetry;
 	RenderEffectCallback mRenderEffect;
 	OutputReadyCallback mOutputReady;
 	PaintCallback mPaint;
-	std::array<AsyncReadbackSlot, 3> mAsyncReadbackSlots;
+	OutputReadbackMode mOutputReadbackMode = OutputReadbackMode::AsyncPbo;
+	std::vector<AsyncReadbackSlot> mAsyncReadbackSlots;
+	std::size_t mAsyncReadbackDepth = 0;
 	std::size_t mAsyncReadbackWriteIndex = 0;
 	std::size_t mAsyncReadbackReadIndex = 0;
 	std::size_t mAsyncReadbackBytes = 0;

apps/LoopThroughWithOpenGLCompositing/gl/pipeline/OpenGLVideoIOBridge.cpp

@@ -1,124 +1,25 @@
 #include "OpenGLVideoIOBridge.h"
 
-#include "OpenGLRenderer.h"
-#include "RuntimeHost.h"
+#include "RenderEngine.h"
 
-#include <chrono>
-#include <gl/gl.h>
-
-OpenGLVideoIOBridge::OpenGLVideoIOBridge(
-	VideoIODevice& videoIO,
-	OpenGLRenderer& renderer,
-	OpenGLRenderPipeline& renderPipeline,
-	RuntimeHost& runtimeHost,
-	CRITICAL_SECTION& mutex,
-	HDC hdc,
-	HGLRC hglrc) :
-	mVideoIO(videoIO),
-	mRenderer(renderer),
-	mRenderPipeline(renderPipeline),
-	mRuntimeHost(runtimeHost),
-	mMutex(mutex),
-	mHdc(hdc),
-	mHglrc(hglrc)
+OpenGLVideoIOBridge::OpenGLVideoIOBridge(RenderEngine& renderEngine) :
+	mRenderEngine(renderEngine)
 {
 }
 
-void OpenGLVideoIOBridge::RecordFramePacing(VideoIOCompletionResult completionResult)
+void OpenGLVideoIOBridge::UploadInputFrame(const VideoIOFrame& inputFrame, const VideoIOState& state)
 {
-	const auto now = std::chrono::steady_clock::now();
-	if (mLastPlayoutCompletionTime != std::chrono::steady_clock::time_point())
-	{
-		mCompletionIntervalMilliseconds = std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(now - mLastPlayoutCompletionTime).count();
-		if (mSmoothedCompletionIntervalMilliseconds <= 0.0)
-			mSmoothedCompletionIntervalMilliseconds = mCompletionIntervalMilliseconds;
-		else
-			mSmoothedCompletionIntervalMilliseconds = mSmoothedCompletionIntervalMilliseconds * 0.9 + mCompletionIntervalMilliseconds * 0.1;
-		if (mCompletionIntervalMilliseconds > mMaxCompletionIntervalMilliseconds)
-			mMaxCompletionIntervalMilliseconds = mCompletionIntervalMilliseconds;
-	}
-	mLastPlayoutCompletionTime = now;
-
-	if (completionResult == VideoIOCompletionResult::DisplayedLate)
-		++mLateFrameCount;
-	else if (completionResult == VideoIOCompletionResult::Dropped)
-		++mDroppedFrameCount;
-	else if (completionResult == VideoIOCompletionResult::Flushed)
-		++mFlushedFrameCount;
-
-	mRuntimeHost.TrySetFramePacingStats(
-		mCompletionIntervalMilliseconds,
-		mSmoothedCompletionIntervalMilliseconds,
-		mMaxCompletionIntervalMilliseconds,
-		mLateFrameCount,
-		mDroppedFrameCount,
-		mFlushedFrameCount);
-}
-
-void OpenGLVideoIOBridge::VideoFrameArrived(const VideoIOFrame& inputFrame)
-{
-	const VideoIOState& state = mVideoIO.State();
-	mRuntimeHost.TrySetSignalStatus(!inputFrame.hasNoInputSource, state.inputFrameSize.width, state.inputFrameSize.height, state.inputDisplayModeName);
-
 	if (inputFrame.hasNoInputSource || inputFrame.bytes == nullptr)
 		return;							// don't transfer texture when there's no input
 
-	const long textureSize = inputFrame.rowBytes * static_cast<long>(inputFrame.height);
-
-	// Never let input upload stall the playout/render callback. If the GL bridge
-	// is busy producing an output frame, skip this upload and use the next input.
-	if (!TryEnterCriticalSection(&mMutex))
-		return;
-
-	wglMakeCurrent(mHdc, mHglrc);		// make OpenGL context current in this thread
-
-	glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
-	glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
-	glBindBuffer(GL_PIXEL_UNPACK_BUFFER, mRenderer.TextureUploadBuffer());
-	glBufferData(GL_PIXEL_UNPACK_BUFFER, textureSize, inputFrame.bytes, GL_DYNAMIC_DRAW);
-	glBindTexture(GL_TEXTURE_2D, mRenderer.CaptureTexture());
-
-	// NULL for last arg indicates use current GL_PIXEL_UNPACK_BUFFER target as texture data.
-	if (inputFrame.pixelFormat == VideoIOPixelFormat::V210)
-		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, state.captureTextureWidth, state.inputFrameSize.height, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
-	else
-		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, state.captureTextureWidth, state.inputFrameSize.height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL);
-
-	glBindTexture(GL_TEXTURE_2D, 0);
-	glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
-
-	wglMakeCurrent(NULL, NULL);
-
-	LeaveCriticalSection(&mMutex);
+	mRenderEngine.QueueInputFrame(inputFrame, state);
 }
 
-void OpenGLVideoIOBridge::PlayoutFrameCompleted(const VideoIOCompletion& completion)
+bool OpenGLVideoIOBridge::RenderScheduledFrame(const VideoIOState& state, const VideoIOCompletion& completion, VideoIOOutputFrame& outputFrame)
 {
-	RecordFramePacing(completion.result);
-
-	VideoIOOutputFrame outputFrame;
-	if (!mVideoIO.BeginOutputFrame(outputFrame))
-		return;
-	const VideoIOState& state = mVideoIO.State();
 	RenderPipelineFrameContext frameContext;
 	frameContext.videoState = state;
 	frameContext.completion = completion;
 
-	EnterCriticalSection(&mMutex);
-
-	// make GL context current in this thread
-	wglMakeCurrent(mHdc, mHglrc);
-
-	mRenderPipeline.RenderFrame(frameContext, outputFrame);
-	wglMakeCurrent(NULL, NULL);
-
-	LeaveCriticalSection(&mMutex);
-
-	mVideoIO.EndOutputFrame(outputFrame);
-
-	mVideoIO.AccountForCompletionResult(completion.result);
-
-	// Schedule the next frame for playout after the GL bridge is released so
-	// input uploads are not blocked by non-GL output bookkeeping.
-	mVideoIO.ScheduleOutputFrame(outputFrame);
+	return mRenderEngine.RequestOutputFrame(frameContext, outputFrame);
 }

apps/LoopThroughWithOpenGLCompositing/gl/pipeline/OpenGLVideoIOBridge.h

@@ -2,43 +2,16 @@
 
 #include "OpenGLRenderPipeline.h"
 
-#include <windows.h>
-
-#include <chrono>
-#include <cstdint>
-
-class RuntimeHost;
+class RenderEngine;
 
 class OpenGLVideoIOBridge
 {
 public:
-	OpenGLVideoIOBridge(
-		VideoIODevice& videoIO,
-		OpenGLRenderer& renderer,
-		OpenGLRenderPipeline& renderPipeline,
-		RuntimeHost& runtimeHost,
-		CRITICAL_SECTION& mutex,
-		HDC hdc,
-		HGLRC hglrc);
+	explicit OpenGLVideoIOBridge(RenderEngine& renderEngine);
 
-	void VideoFrameArrived(const VideoIOFrame& inputFrame);
-	void PlayoutFrameCompleted(const VideoIOCompletion& completion);
+	void UploadInputFrame(const VideoIOFrame& inputFrame, const VideoIOState& state);
+	bool RenderScheduledFrame(const VideoIOState& state, const VideoIOCompletion& completion, VideoIOOutputFrame& outputFrame);
 
 private:
-	void RecordFramePacing(VideoIOCompletionResult completionResult);
-
-	VideoIODevice& mVideoIO;
-	OpenGLRenderer& mRenderer;
-	OpenGLRenderPipeline& mRenderPipeline;
-	RuntimeHost& mRuntimeHost;
-	CRITICAL_SECTION& mMutex;
-	HDC mHdc;
-	HGLRC mHglrc;
-	std::chrono::steady_clock::time_point mLastPlayoutCompletionTime;
-	double mCompletionIntervalMilliseconds = 0.0;
-	double mSmoothedCompletionIntervalMilliseconds = 0.0;
-	double mMaxCompletionIntervalMilliseconds = 0.0;
-	uint64_t mLateFrameCount = 0;
-	uint64_t mDroppedFrameCount = 0;
-	uint64_t mFlushedFrameCount = 0;
+	RenderEngine& mRenderEngine;
 };

apps/LoopThroughWithOpenGLCompositing/gl/renderer/GlRenderConstants.h

@@ -7,4 +7,3 @@ constexpr GLuint kDecodedVideoTextureUnit = 1;
 constexpr GLuint kSourceHistoryTextureUnitBase = 2;
 constexpr GLuint kPackedVideoTextureUnit = 2;
 constexpr GLuint kGlobalParamsBindingPoint = 0;
-constexpr unsigned kPrerollFrameCount = 12;

apps/LoopThroughWithOpenGLCompositing/gl/shader/OpenGLShaderPrograms.cpp

@@ -29,19 +29,21 @@ std::size_t RequiredTemporaryRenderTargets(const std::vector<OpenGLRenderer::Lay
 }
 }
 
-OpenGLShaderPrograms::OpenGLShaderPrograms(OpenGLRenderer& renderer, RuntimeHost& runtimeHost) :
+OpenGLShaderPrograms::OpenGLShaderPrograms(OpenGLRenderer& renderer, RuntimeSnapshotProvider& runtimeSnapshotProvider) :
 	mRenderer(renderer),
-	mRuntimeHost(runtimeHost),
+	mRuntimeSnapshotProvider(runtimeSnapshotProvider),
 	mGlobalParamsBuffer(renderer),
-	mCompiler(renderer, runtimeHost, mTextureBindings)
+	mCompiler(renderer, runtimeSnapshotProvider, mTextureBindings)
 {
 }
 
 bool OpenGLShaderPrograms::CompileLayerPrograms(unsigned inputFrameWidth, unsigned inputFrameHeight, int errorMessageSize, char* errorMessage)
 {
-	const std::vector<RuntimeRenderState> layerStates = mRuntimeHost.GetLayerRenderStates(inputFrameWidth, inputFrameHeight);
+	const RuntimeRenderStateSnapshot renderSnapshot =
+		mRuntimeSnapshotProvider.PublishRenderStateSnapshot(inputFrameWidth, inputFrameHeight);
+	const std::vector<RuntimeRenderState>& layerStates = renderSnapshot.states;
 	std::string temporalError;
-	const unsigned historyCap = mRuntimeHost.GetMaxTemporalHistoryFrames();
+	const unsigned historyCap = mRuntimeSnapshotProvider.GetMaxTemporalHistoryFrames();
 	if (!mRenderer.TemporalHistory().ValidateTextureUnitBudget(layerStates, historyCap, temporalError))
 	{
 		CopyErrorMessage(temporalError, errorMessageSize, errorMessage);
@@ -87,10 +89,7 @@ bool OpenGLShaderPrograms::CompileLayerPrograms(unsigned inputFrameWidth, unsign
 
 	DestroyLayerPrograms();
 	mRenderer.ReplaceLayerPrograms(newPrograms);
-	mCommittedLayerStates = layerStates;
-
-	mRuntimeHost.SetCompileStatus(true, "Shader layers compiled successfully.");
-	mRuntimeHost.ClearReloadRequest();
+	mCommittedLayerStates = renderSnapshot.states;
 
 	return true;
 }
@@ -104,19 +103,19 @@ bool OpenGLShaderPrograms::CommitPreparedLayerPrograms(const PreparedShaderBuild
 	}
 
 	std::string temporalError;
-	const unsigned historyCap = mRuntimeHost.GetMaxTemporalHistoryFrames();
-	if (!mRenderer.TemporalHistory().ValidateTextureUnitBudget(preparedBuild.layerStates, historyCap, temporalError))
+	const unsigned historyCap = mRuntimeSnapshotProvider.GetMaxTemporalHistoryFrames();
+	if (!mRenderer.TemporalHistory().ValidateTextureUnitBudget(preparedBuild.renderSnapshot.states, historyCap, temporalError))
 	{
 		CopyErrorMessage(temporalError, errorMessageSize, errorMessage);
 		return false;
 	}
-	if (!mRenderer.TemporalHistory().EnsureResources(preparedBuild.layerStates, historyCap, inputFrameWidth, inputFrameHeight, temporalError))
+	if (!mRenderer.TemporalHistory().EnsureResources(preparedBuild.renderSnapshot.states, historyCap, inputFrameWidth, inputFrameHeight, temporalError))
 	{
 		CopyErrorMessage(temporalError, errorMessageSize, errorMessage);
 		return false;
 	}
 	if (mRenderer.ResourcesInitialized() &&
-		!mRenderer.FeedbackBuffers().EnsureResources(preparedBuild.layerStates, inputFrameWidth, inputFrameHeight, temporalError))
+		!mRenderer.FeedbackBuffers().EnsureResources(preparedBuild.renderSnapshot.states, inputFrameWidth, inputFrameHeight, temporalError))
 	{
 		CopyErrorMessage(temporalError, errorMessageSize, errorMessage);
 		return false;
@@ -150,10 +149,7 @@ bool OpenGLShaderPrograms::CommitPreparedLayerPrograms(const PreparedShaderBuild
 
 	DestroyLayerPrograms();
 	mRenderer.ReplaceLayerPrograms(newPrograms);
-	mCommittedLayerStates = preparedBuild.layerStates;
-
-	mRuntimeHost.SetCompileStatus(true, "Shader layers compiled successfully.");
-	mRuntimeHost.ClearReloadRequest();
+	mCommittedLayerStates = preparedBuild.renderSnapshot.states;
 
 	return true;
 }

apps/LoopThroughWithOpenGLCompositing/gl/shader/OpenGLShaderPrograms.h

@@ -2,7 +2,7 @@
 
 #include "GlobalParamsBuffer.h"
 #include "OpenGLRenderer.h"
-#include "RuntimeHost.h"
+#include "RuntimeSnapshotProvider.h"
 #include "ShaderBuildQueue.h"
 #include "ShaderTypes.h"
 #include "ShaderProgramCompiler.h"
@@ -15,7 +15,7 @@ class OpenGLShaderPrograms
 public:
 	using LayerProgram = OpenGLRenderer::LayerProgram;
 
-	OpenGLShaderPrograms(OpenGLRenderer& renderer, RuntimeHost& runtimeHost);
+	OpenGLShaderPrograms(OpenGLRenderer& renderer, RuntimeSnapshotProvider& runtimeSnapshotProvider);
 
 	bool CompileLayerPrograms(unsigned inputFrameWidth, unsigned inputFrameHeight, int errorMessageSize, char* errorMessage);
 	bool CommitPreparedLayerPrograms(const PreparedShaderBuild& preparedBuild, unsigned inputFrameWidth, unsigned inputFrameHeight, int errorMessageSize, char* errorMessage);
@@ -32,7 +32,7 @@ public:
 
 private:
 	OpenGLRenderer& mRenderer;
-	RuntimeHost& mRuntimeHost;
+	RuntimeSnapshotProvider& mRuntimeSnapshotProvider;
 	ShaderTextureBindings mTextureBindings;
 	GlobalParamsBuffer mGlobalParamsBuffer;
 	ShaderProgramCompiler mCompiler;

apps/LoopThroughWithOpenGLCompositing/gl/shader/ShaderBuildQueue.cpp

@@ -1,6 +1,6 @@
 #include "ShaderBuildQueue.h"
 
-#include "RuntimeHost.h"
+#include "RuntimeEventDispatcher.h"
 
 #include <chrono>
 #include <utility>
@@ -10,8 +10,9 @@ namespace
 constexpr auto kShaderBuildDebounce = std::chrono::milliseconds(400);
 }
 
-ShaderBuildQueue::ShaderBuildQueue(RuntimeHost& runtimeHost) :
-	mRuntimeHost(runtimeHost),
+ShaderBuildQueue::ShaderBuildQueue(RuntimeSnapshotProvider& runtimeSnapshotProvider, RuntimeEventDispatcher& runtimeEventDispatcher) :
+	mRuntimeSnapshotProvider(runtimeSnapshotProvider),
+	mRuntimeEventDispatcher(runtimeEventDispatcher),
 	mWorkerThread([this]() { WorkerLoop(); })
 {
 }
@@ -46,6 +47,18 @@ bool ShaderBuildQueue::TryConsumeReadyBuild(PreparedShaderBuild& build)
 	return true;
 }
 
+bool ShaderBuildQueue::TryConsumeReadyBuild(uint64_t expectedGeneration, PreparedShaderBuild& build)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!mHasReadyBuild || mReadyBuild.generation != expectedGeneration)
+		return false;
+
+	build = std::move(mReadyBuild);
+	mReadyBuild = PreparedShaderBuild();
+	mHasReadyBuild = false;
+	return true;
+}
+
 void ShaderBuildQueue::Stop()
 {
 	{
@@ -99,13 +112,20 @@ void ShaderBuildQueue::WorkerLoop()
 
 		PreparedShaderBuild build = Build(generation, outputWidth, outputHeight);
 
-		std::lock_guard<std::mutex> lock(mMutex);
-		if (mStopping)
-			return;
-		if (generation != mRequestedGeneration)
-			continue;
-		mReadyBuild = std::move(build);
-		mHasReadyBuild = true;
+		bool shouldPublish = false;
+		{
+			std::lock_guard<std::mutex> lock(mMutex);
+			if (mStopping)
+				return;
+			if (generation != mRequestedGeneration)
+				continue;
+			mReadyBuild = build;
+			mHasReadyBuild = true;
+			shouldPublish = true;
+		}
+
+		if (shouldPublish)
+			PublishBuildLifecycleEvent(build, outputWidth, outputHeight);
 	}
 }
 
@@ -113,14 +133,14 @@ PreparedShaderBuild ShaderBuildQueue::Build(uint64_t generation, unsigned output
 {
 	PreparedShaderBuild build;
 	build.generation = generation;
-	build.layerStates = mRuntimeHost.GetLayerRenderStates(outputWidth, outputHeight);
-	build.layers.reserve(build.layerStates.size());
+	build.renderSnapshot = mRuntimeSnapshotProvider.PublishRenderStateSnapshot(outputWidth, outputHeight);
+	build.layers.reserve(build.renderSnapshot.states.size());
 
-	for (const RuntimeRenderState& state : build.layerStates)
+	for (const RuntimeRenderState& state : build.renderSnapshot.states)
 	{
 		PreparedLayerShader layer;
 		layer.state = state;
-		if (!mRuntimeHost.BuildLayerPassFragmentShaderSources(state.layerId, layer.passes, build.message))
+		if (!mRuntimeSnapshotProvider.BuildLayerPassFragmentShaderSources(state.layerId, layer.passes, build.message))
 		{
 			build.succeeded = false;
 			return build;
@@ -132,3 +152,15 @@ PreparedShaderBuild ShaderBuildQueue::Build(uint64_t generation, unsigned output
 	build.message = "Shader layers prepared successfully.";
 	return build;
 }
+
+void ShaderBuildQueue::PublishBuildLifecycleEvent(const PreparedShaderBuild& build, unsigned outputWidth, unsigned outputHeight) const
+{
+	ShaderBuildEvent event;
+	event.phase = build.succeeded ? RuntimeEventShaderBuildPhase::Prepared : RuntimeEventShaderBuildPhase::Failed;
+	event.generation = build.generation;
+	event.inputWidth = outputWidth;
+	event.inputHeight = outputHeight;
+	event.succeeded = build.succeeded;
+	event.message = build.message;
+	mRuntimeEventDispatcher.PublishPayload(event, "ShaderBuildQueue");
+}

apps/LoopThroughWithOpenGLCompositing/gl/shader/ShaderBuildQueue.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "RuntimeSnapshotProvider.h"
 #include "ShaderTypes.h"
 
 #include <condition_variable>
@@ -9,7 +10,7 @@
 #include <thread>
 #include <vector>
 
-class RuntimeHost;
+class RuntimeEventDispatcher;
 
 struct PreparedLayerShader
 {
@@ -22,14 +23,14 @@ struct PreparedShaderBuild
 	uint64_t generation = 0;
 	bool succeeded = false;
 	std::string message;
-	std::vector<RuntimeRenderState> layerStates;
+	RuntimeRenderStateSnapshot renderSnapshot;
 	std::vector<PreparedLayerShader> layers;
 };
 
 class ShaderBuildQueue
 {
 public:
-	explicit ShaderBuildQueue(RuntimeHost& runtimeHost);
+	ShaderBuildQueue(RuntimeSnapshotProvider& runtimeSnapshotProvider, RuntimeEventDispatcher& runtimeEventDispatcher);
 	~ShaderBuildQueue();
 
 	ShaderBuildQueue(const ShaderBuildQueue&) = delete;
@@ -37,13 +38,16 @@ public:
 
 	void RequestBuild(unsigned outputWidth, unsigned outputHeight);
 	bool TryConsumeReadyBuild(PreparedShaderBuild& build);
+	bool TryConsumeReadyBuild(uint64_t expectedGeneration, PreparedShaderBuild& build);
 	void Stop();
 
 private:
 	void WorkerLoop();
 	PreparedShaderBuild Build(uint64_t generation, unsigned outputWidth, unsigned outputHeight);
+	void PublishBuildLifecycleEvent(const PreparedShaderBuild& build, unsigned outputWidth, unsigned outputHeight) const;
 
-	RuntimeHost& mRuntimeHost;
+	RuntimeSnapshotProvider& mRuntimeSnapshotProvider;
+	RuntimeEventDispatcher& mRuntimeEventDispatcher;
 	std::thread mWorkerThread;
 	std::mutex mMutex;
 	std::condition_variable mCondition;

apps/LoopThroughWithOpenGLCompositing/gl/shader/ShaderProgramCompiler.cpp

@@ -19,9 +19,9 @@ void CopyErrorMessage(const std::string& message, int errorMessageSize, char* er
 }
 }
 
-ShaderProgramCompiler::ShaderProgramCompiler(OpenGLRenderer& renderer, RuntimeHost& runtimeHost, ShaderTextureBindings& textureBindings) :
+ShaderProgramCompiler::ShaderProgramCompiler(OpenGLRenderer& renderer, RuntimeSnapshotProvider& runtimeSnapshotProvider, ShaderTextureBindings& textureBindings) :
 	mRenderer(renderer),
-	mRuntimeHost(runtimeHost),
+	mRuntimeSnapshotProvider(runtimeSnapshotProvider),
 	mTextureBindings(textureBindings)
 {
 }
@@ -31,7 +31,7 @@ bool ShaderProgramCompiler::CompileLayerProgram(const RuntimeRenderState& state,
 	std::vector<ShaderPassBuildSource> passSources;
 	std::string loadError;
 
-	if (!mRuntimeHost.BuildLayerPassFragmentShaderSources(state.layerId, passSources, loadError))
+	if (!mRuntimeSnapshotProvider.BuildLayerPassFragmentShaderSources(state.layerId, passSources, loadError))
 	{
 		CopyErrorMessage(loadError, errorMessageSize, errorMessage);
 		return false;
@@ -117,7 +117,7 @@ bool ShaderProgramCompiler::CompilePreparedLayerProgram(const RuntimeRenderState
 		passProgram.passId = passSource.passId;
 		passProgram.inputNames = passSource.inputNames;
 		passProgram.outputName = passSource.outputName;
-		passProgram.shaderTextureBase = mTextureBindings.ResolveShaderTextureBase(state, mRuntimeHost.GetMaxTemporalHistoryFrames());
+		passProgram.shaderTextureBase = mTextureBindings.ResolveShaderTextureBase(state, mRuntimeSnapshotProvider.GetMaxTemporalHistoryFrames());
 		passProgram.textureBindings.swap(textureBindings);
 		passProgram.textBindings.swap(textBindings);
 
@@ -125,7 +125,7 @@ bool ShaderProgramCompiler::CompilePreparedLayerProgram(const RuntimeRenderState
 		if (globalParamsIndex != GL_INVALID_INDEX)
 			glUniformBlockBinding(newProgram.get(), globalParamsIndex, kGlobalParamsBindingPoint);
 
-		const unsigned historyCap = mRuntimeHost.GetMaxTemporalHistoryFrames();
+		const unsigned historyCap = mRuntimeSnapshotProvider.GetMaxTemporalHistoryFrames();
 		glUseProgram(newProgram.get());
 		mTextureBindings.AssignLayerSamplerUniforms(newProgram.get(), state, passProgram, historyCap);
 		glUseProgram(0);

apps/LoopThroughWithOpenGLCompositing/gl/shader/ShaderProgramCompiler.h

@@ -1,7 +1,7 @@
 #pragma once
 
 #include "OpenGLRenderer.h"
-#include "RuntimeHost.h"
+#include "RuntimeSnapshotProvider.h"
 #include "ShaderTextureBindings.h"
 
 #include <string>
@@ -13,7 +13,7 @@ public:
 	using LayerProgram = OpenGLRenderer::LayerProgram;
 	using PassProgram = OpenGLRenderer::LayerProgram::PassProgram;
 
-	ShaderProgramCompiler(OpenGLRenderer& renderer, RuntimeHost& runtimeHost, ShaderTextureBindings& textureBindings);
+	ShaderProgramCompiler(OpenGLRenderer& renderer, RuntimeSnapshotProvider& runtimeSnapshotProvider, ShaderTextureBindings& textureBindings);
 
 	bool CompileLayerProgram(const RuntimeRenderState& state, LayerProgram& layerProgram, int errorMessageSize, char* errorMessage);
 	bool CompilePreparedLayerProgram(const RuntimeRenderState& state, const std::vector<ShaderPassBuildSource>& passSources, LayerProgram& layerProgram, int errorMessageSize, char* errorMessage);
@@ -22,6 +22,6 @@ public:
 
 private:
 	OpenGLRenderer& mRenderer;
-	RuntimeHost& mRuntimeHost;
+	RuntimeSnapshotProvider& mRuntimeSnapshotProvider;
 	ShaderTextureBindings& mTextureBindings;
 };

apps/LoopThroughWithOpenGLCompositing/gl/threading/RenderCommandQueue.cpp

@@ -0,0 +1,160 @@
+#include "RenderCommandQueue.h"
+
+void RenderCommandQueue::RequestPreviewPresent(const RenderPreviewPresentRequest& request)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mHasPreviewPresentRequest)
+		++mCoalescedCount;
+	else
+		++mEnqueuedCount;
+
+	mPreviewPresentRequest = request;
+	mHasPreviewPresentRequest = true;
+}
+
+bool RenderCommandQueue::TryTakePreviewPresent(RenderPreviewPresentRequest& request)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!mHasPreviewPresentRequest)
+		return false;
+
+	request = mPreviewPresentRequest;
+	mPreviewPresentRequest = {};
+	mHasPreviewPresentRequest = false;
+	return true;
+}
+
+void RenderCommandQueue::RequestScreenshotCapture(const RenderScreenshotCaptureRequest& request)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mHasScreenshotCaptureRequest)
+		++mCoalescedCount;
+	else
+		++mEnqueuedCount;
+
+	mScreenshotCaptureRequest = request;
+	mHasScreenshotCaptureRequest = true;
+}
+
+bool RenderCommandQueue::TryTakeScreenshotCapture(RenderScreenshotCaptureRequest& request)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!mHasScreenshotCaptureRequest)
+		return false;
+
+	request = mScreenshotCaptureRequest;
+	mScreenshotCaptureRequest = {};
+	mHasScreenshotCaptureRequest = false;
+	return true;
+}
+
+void RenderCommandQueue::RequestInputUpload(const RenderInputUploadRequest& request)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mHasInputUploadRequest)
+		++mCoalescedCount;
+	else
+		++mEnqueuedCount;
+
+	mInputUploadRequest = request;
+	mHasInputUploadRequest = true;
+}
+
+bool RenderCommandQueue::TryTakeInputUpload(RenderInputUploadRequest& request)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!mHasInputUploadRequest)
+		return false;
+
+	request = mInputUploadRequest;
+	mInputUploadRequest = {};
+	mHasInputUploadRequest = false;
+	return true;
+}
+
+void RenderCommandQueue::RequestOutputFrame(const RenderOutputFrameRequest& request)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mOutputFrameRequests.push_back(request);
+	++mEnqueuedCount;
+}
+
+bool RenderCommandQueue::TryTakeOutputFrame(RenderOutputFrameRequest& request)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mOutputFrameRequests.empty())
+		return false;
+
+	request = mOutputFrameRequests.front();
+	mOutputFrameRequests.pop_front();
+	return true;
+}
+
+void RenderCommandQueue::RequestRenderReset(RenderCommandResetScope scope)
+{
+	if (scope == RenderCommandResetScope::None)
+		return;
+
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mRenderResetScope != RenderCommandResetScope::None)
+		++mCoalescedCount;
+	else
+		++mEnqueuedCount;
+
+	mRenderResetScope = MergeResetScopes(mRenderResetScope, scope);
+}
+
+bool RenderCommandQueue::TryTakeRenderReset(RenderCommandResetScope& scope)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mRenderResetScope == RenderCommandResetScope::None)
+		return false;
+
+	scope = mRenderResetScope;
+	mRenderResetScope = RenderCommandResetScope::None;
+	return true;
+}
+
+RenderCommandQueueMetrics RenderCommandQueue::GetMetrics() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	RenderCommandQueueMetrics metrics;
+	metrics.depth =
+		(mHasPreviewPresentRequest ? 1u : 0u) +
+		(mHasScreenshotCaptureRequest ? 1u : 0u) +
+		(mHasInputUploadRequest ? 1u : 0u) +
+		mOutputFrameRequests.size() +
+		(mRenderResetScope != RenderCommandResetScope::None ? 1u : 0u);
+	metrics.enqueuedCount = mEnqueuedCount;
+	metrics.coalescedCount = mCoalescedCount;
+	return metrics;
+}
+
+RenderCommandResetScope RenderCommandQueue::MergeResetScopes(RenderCommandResetScope current, RenderCommandResetScope requested)
+{
+	if (current == RenderCommandResetScope::TemporalHistoryAndFeedback ||
+		requested == RenderCommandResetScope::TemporalHistoryAndFeedback)
+	{
+		return RenderCommandResetScope::TemporalHistoryAndFeedback;
+	}
+
+	if ((current == RenderCommandResetScope::TemporalHistoryOnly && requested == RenderCommandResetScope::ShaderFeedbackOnly) ||
+		(current == RenderCommandResetScope::ShaderFeedbackOnly && requested == RenderCommandResetScope::TemporalHistoryOnly))
+	{
+		return RenderCommandResetScope::TemporalHistoryAndFeedback;
+	}
+
+	if (current == RenderCommandResetScope::TemporalHistoryOnly ||
+		requested == RenderCommandResetScope::TemporalHistoryOnly)
+	{
+		return RenderCommandResetScope::TemporalHistoryOnly;
+	}
+
+	if (current == RenderCommandResetScope::ShaderFeedbackOnly ||
+		requested == RenderCommandResetScope::ShaderFeedbackOnly)
+	{
+		return RenderCommandResetScope::ShaderFeedbackOnly;
+	}
+
+	return RenderCommandResetScope::None;
+}

apps/LoopThroughWithOpenGLCompositing/gl/threading/RenderCommandQueue.h

@@ -0,0 +1,85 @@
+#pragma once
+
+#include "VideoIOTypes.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <deque>
+#include <mutex>
+#include <vector>
+
+enum class RenderCommandResetScope
+{
+	None,
+	ShaderFeedbackOnly,
+	TemporalHistoryOnly,
+	TemporalHistoryAndFeedback
+};
+
+struct RenderPreviewPresentRequest
+{
+	unsigned outputFrameWidth = 0;
+	unsigned outputFrameHeight = 0;
+};
+
+struct RenderScreenshotCaptureRequest
+{
+	unsigned width = 0;
+	unsigned height = 0;
+};
+
+struct RenderInputUploadRequest
+{
+	VideoIOFrame inputFrame;
+	VideoIOState videoState;
+	std::vector<unsigned char> ownedBytes;
+};
+
+struct RenderOutputFrameRequest
+{
+	VideoIOState videoState;
+	VideoIOCompletion completion;
+};
+
+struct RenderCommandQueueMetrics
+{
+	std::size_t depth = 0;
+	uint64_t enqueuedCount = 0;
+	uint64_t coalescedCount = 0;
+};
+
+class RenderCommandQueue
+{
+public:
+	void RequestPreviewPresent(const RenderPreviewPresentRequest& request);
+	bool TryTakePreviewPresent(RenderPreviewPresentRequest& request);
+
+	void RequestScreenshotCapture(const RenderScreenshotCaptureRequest& request);
+	bool TryTakeScreenshotCapture(RenderScreenshotCaptureRequest& request);
+
+	void RequestInputUpload(const RenderInputUploadRequest& request);
+	bool TryTakeInputUpload(RenderInputUploadRequest& request);
+
+	void RequestOutputFrame(const RenderOutputFrameRequest& request);
+	bool TryTakeOutputFrame(RenderOutputFrameRequest& request);
+
+	void RequestRenderReset(RenderCommandResetScope scope);
+	bool TryTakeRenderReset(RenderCommandResetScope& scope);
+
+	RenderCommandQueueMetrics GetMetrics() const;
+
+private:
+	static RenderCommandResetScope MergeResetScopes(RenderCommandResetScope current, RenderCommandResetScope requested);
+
+	mutable std::mutex mMutex;
+	bool mHasPreviewPresentRequest = false;
+	RenderPreviewPresentRequest mPreviewPresentRequest;
+	bool mHasScreenshotCaptureRequest = false;
+	RenderScreenshotCaptureRequest mScreenshotCaptureRequest;
+	bool mHasInputUploadRequest = false;
+	RenderInputUploadRequest mInputUploadRequest;
+	std::deque<RenderOutputFrameRequest> mOutputFrameRequests;
+	RenderCommandResetScope mRenderResetScope = RenderCommandResetScope::None;
+	uint64_t mEnqueuedCount = 0;
+	uint64_t mCoalescedCount = 0;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/RuntimeHost.h

@@ -1,199 +0,0 @@
-#pragma once
-
-#include "RuntimeJson.h"
-#include "ShaderTypes.h"
-
-#include <atomic>
-#include <chrono>
-#include <filesystem>
-#include <map>
-#include <mutex>
-#include <string>
-#include <utility>
-#include <vector>
-
-class RuntimeHost
-{
-public:
-	RuntimeHost();
-
-	bool Initialize(std::string& error);
-
-	bool PollFileChanges(bool& registryChanged, bool& reloadRequested, std::string& error);
-	bool ManualReloadRequested();
-	void ClearReloadRequest();
-
-	bool AddLayer(const std::string& shaderId, std::string& error);
-	bool RemoveLayer(const std::string& layerId, std::string& error);
-	bool MoveLayer(const std::string& layerId, int direction, std::string& error);
-	bool MoveLayerToIndex(const std::string& layerId, std::size_t targetIndex, std::string& error);
-	bool SetLayerBypass(const std::string& layerId, bool bypassed, std::string& error);
-	bool SetLayerShader(const std::string& layerId, const std::string& shaderId, std::string& error);
-	bool UpdateLayerParameter(const std::string& layerId, const std::string& parameterId, const JsonValue& newValue, std::string& error);
-	bool UpdateLayerParameterByControlKey(const std::string& layerKey, const std::string& parameterKey, const JsonValue& newValue, std::string& error);
-	bool UpdateLayerParameterByControlKey(const std::string& layerKey, const std::string& parameterKey, const JsonValue& newValue, bool persistState, std::string& error);
-	bool ApplyOscTargetByControlKey(const std::string& layerKey, const std::string& parameterKey, const JsonValue& targetValue, double smoothingAmount, bool& keepApplying, std::string& resolvedLayerId, std::string& resolvedParameterId, ShaderParameterValue& appliedValue, std::string& error);
-	bool ResetLayerParameters(const std::string& layerId, std::string& error);
-	bool SaveStackPreset(const std::string& presetName, std::string& error) const;
-	bool LoadStackPreset(const std::string& presetName, std::string& error);
-
-	void SetCompileStatus(bool succeeded, const std::string& message);
-	void SetSignalStatus(bool hasSignal, unsigned width, unsigned height, const std::string& modeName);
-	bool TrySetSignalStatus(bool hasSignal, unsigned width, unsigned height, const std::string& modeName);
-	void SetDeckLinkOutputStatus(const std::string& modelName, bool supportsInternalKeying, bool supportsExternalKeying,
-		bool keyerInterfaceAvailable, bool externalKeyingRequested, bool externalKeyingActive, const std::string& statusMessage);
-	void SetVideoIOStatus(const std::string& backendName, const std::string& modelName, bool supportsInternalKeying, bool supportsExternalKeying,
-		bool keyerInterfaceAvailable, bool externalKeyingRequested, bool externalKeyingActive, const std::string& statusMessage);
-	void SetPerformanceStats(double frameBudgetMilliseconds, double renderMilliseconds);
-	bool TrySetPerformanceStats(double frameBudgetMilliseconds, double renderMilliseconds);
-	void SetFramePacingStats(double completionIntervalMilliseconds, double smoothedCompletionIntervalMilliseconds,
-		double maxCompletionIntervalMilliseconds, uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount);
-	bool TrySetFramePacingStats(double completionIntervalMilliseconds, double smoothedCompletionIntervalMilliseconds,
-		double maxCompletionIntervalMilliseconds, uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount);
-	void AdvanceFrame();
-	bool TryAdvanceFrame();
-
-	bool BuildLayerPassFragmentShaderSources(const std::string& layerId, std::vector<ShaderPassBuildSource>& passSources, std::string& error);
-	std::vector<RuntimeRenderState> GetLayerRenderStates(unsigned outputWidth, unsigned outputHeight) const;
-	bool TryGetLayerRenderStates(unsigned outputWidth, unsigned outputHeight, std::vector<RuntimeRenderState>& states) const;
-	bool TryRefreshCachedLayerStates(std::vector<RuntimeRenderState>& states) const;
-	void RefreshDynamicRenderStateFields(std::vector<RuntimeRenderState>& states) const;
-	std::string BuildStateJson() const;
-	uint64_t GetRenderStateVersion() const { return mRenderStateVersion.load(std::memory_order_relaxed); }
-	uint64_t GetParameterStateVersion() const { return mParameterStateVersion.load(std::memory_order_relaxed); }
-
-	const std::filesystem::path& GetRepoRoot() const { return mRepoRoot; }
-	const std::filesystem::path& GetUiRoot() const { return mUiRoot; }
-	const std::filesystem::path& GetDocsRoot() const { return mDocsRoot; }
-	const std::filesystem::path& GetRuntimeRoot() const { return mRuntimeRoot; }
-	unsigned short GetServerPort() const { return mServerPort; }
-	unsigned short GetOscPort() const { return mConfig.oscPort; }
-	const std::string& GetOscBindAddress() const { return mConfig.oscBindAddress; }
-	double GetOscSmoothing() const { return mConfig.oscSmoothing; }
-	unsigned GetMaxTemporalHistoryFrames() const { return mConfig.maxTemporalHistoryFrames; }
-	unsigned GetPreviewFps() const { return mConfig.previewFps; }
-	bool ExternalKeyingEnabled() const { return mConfig.enableExternalKeying; }
-	const std::string& GetInputVideoFormat() const { return mConfig.inputVideoFormat; }
-	const std::string& GetInputFrameRate() const { return mConfig.inputFrameRate; }
-	const std::string& GetOutputVideoFormat() const { return mConfig.outputVideoFormat; }
-	const std::string& GetOutputFrameRate() const { return mConfig.outputFrameRate; }
-	void SetServerPort(unsigned short port);
-	bool AutoReloadEnabled() const { return mAutoReloadEnabled; }
-
-private:
-	struct AppConfig
-	{
-		std::string shaderLibrary = "shaders";
-		unsigned short serverPort = 8080;
-		unsigned short oscPort = 9000;
-		std::string oscBindAddress = "127.0.0.1";
-		double oscSmoothing = 0.18;
-		bool autoReload = true;
-		unsigned maxTemporalHistoryFrames = 4;
-		unsigned previewFps = 30;
-		bool enableExternalKeying = false;
-		std::string inputVideoFormat = "1080p";
-		std::string inputFrameRate = "59.94";
-		std::string outputVideoFormat = "1080p";
-		std::string outputFrameRate = "59.94";
-	};
-
-	struct DeckLinkOutputStatus
-	{
-		std::string backendName = "decklink";
-		std::string modelName;
-		bool supportsInternalKeying = false;
-		bool supportsExternalKeying = false;
-		bool keyerInterfaceAvailable = false;
-		bool externalKeyingRequested = false;
-		bool externalKeyingActive = false;
-		std::string statusMessage;
-	};
-
-	struct LayerPersistentState
-	{
-		std::string id;
-		std::string shaderId;
-		bool bypass = false;
-		std::map<std::string, ShaderParameterValue> parameterValues;
-	};
-
-	struct PersistentState
-	{
-		std::vector<LayerPersistentState> layers;
-	};
-
-	bool LoadConfig(std::string& error);
-	bool LoadPersistentState(std::string& error);
-	bool SavePersistentState(std::string& error) const;
-	bool ScanShaderPackages(std::string& error);
-	bool NormalizeAndValidateValue(const ShaderParameterDefinition& definition, const JsonValue& value, ShaderParameterValue& normalizedValue, std::string& error) const;
-	ShaderParameterValue DefaultValueForDefinition(const ShaderParameterDefinition& definition) const;
-	void EnsureLayerDefaultsLocked(LayerPersistentState& layerState, const ShaderPackage& shaderPackage) const;
-	std::string ReadTextFile(const std::filesystem::path& path, std::string& error) const;
-	bool WriteTextFile(const std::filesystem::path& path, const std::string& contents, std::string& error) const;
-	bool ResolvePaths(std::string& error);
-	void BuildLayerRenderStatesLocked(unsigned outputWidth, unsigned outputHeight, std::vector<RuntimeRenderState>& states) const;
-	JsonValue BuildStateValue() const;
-	JsonValue SerializeLayerStackLocked() const;
-	bool DeserializeLayerStackLocked(const JsonValue& layersValue, std::vector<LayerPersistentState>& layers, std::string& error);
-	void NormalizePersistentLayerIdsLocked();
-	std::vector<std::string> GetStackPresetNamesLocked() const;
-	std::string MakeSafePresetFileStem(const std::string& presetName) const;
-	JsonValue SerializeParameterValue(const ShaderParameterDefinition& definition, const ShaderParameterValue& value) const;
-	std::string TemporalHistorySourceToString(TemporalHistorySource source) const;
-	LayerPersistentState* FindLayerById(const std::string& layerId);
-	const LayerPersistentState* FindLayerById(const std::string& layerId) const;
-	std::string GenerateLayerId();
-	void SetSignalStatusLocked(bool hasSignal, unsigned width, unsigned height, const std::string& modeName);
-	void MarkRenderStateDirtyLocked();
-	void MarkParameterStateDirtyLocked();
-	void SetPerformanceStatsLocked(double frameBudgetMilliseconds, double renderMilliseconds);
-	void SetFramePacingStatsLocked(double completionIntervalMilliseconds, double smoothedCompletionIntervalMilliseconds,
-		double maxCompletionIntervalMilliseconds, uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount);
-
-private:
-	mutable std::mutex mMutex;
-	AppConfig mConfig;
-	PersistentState mPersistentState;
-	std::filesystem::path mRepoRoot;
-	std::filesystem::path mUiRoot;
-	std::filesystem::path mDocsRoot;
-	std::filesystem::path mShaderRoot;
-	std::filesystem::path mRuntimeRoot;
-	std::filesystem::path mPresetRoot;
-	std::filesystem::path mRuntimeStatePath;
-	std::filesystem::path mConfigPath;
-	std::filesystem::path mWrapperPath;
-	std::filesystem::path mGeneratedGlslPath;
-	std::filesystem::path mPatchedGlslPath;
-	std::map<std::string, ShaderPackage> mPackagesById;
-	std::vector<std::string> mPackageOrder;
-	std::vector<ShaderPackageStatus> mPackageStatuses;
-	bool mReloadRequested;
-	bool mCompileSucceeded;
-	std::string mCompileMessage;
-	bool mHasSignal;
-	unsigned mSignalWidth;
-	unsigned mSignalHeight;
-	std::string mSignalModeName;
-	double mFrameBudgetMilliseconds;
-	double mRenderMilliseconds;
-	double mSmoothedRenderMilliseconds;
-	double mCompletionIntervalMilliseconds;
-	double mSmoothedCompletionIntervalMilliseconds;
-	double mMaxCompletionIntervalMilliseconds;
-	double mStartupRandom;
-	uint64_t mLateFrameCount;
-	uint64_t mDroppedFrameCount;
-	uint64_t mFlushedFrameCount;
-	DeckLinkOutputStatus mDeckLinkOutputStatus;
-	unsigned short mServerPort;
-	bool mAutoReloadEnabled;
-	std::chrono::steady_clock::time_point mStartTime;
-	std::chrono::steady_clock::time_point mLastScanTime;
-	std::atomic<uint64_t> mFrameCounter{ 0 };
-	std::atomic<uint64_t> mRenderStateVersion{ 0 };
-	std::atomic<uint64_t> mParameterStateVersion{ 0 };
-	uint64_t mNextLayerId;
-};

apps/LoopThroughWithOpenGLCompositing/runtime/coordination/RuntimeCoordinator.cpp

@@ -0,0 +1,613 @@
+#include "RuntimeCoordinator.h"
+
+#include "RuntimeEventDispatcher.h"
+#include "RuntimeEventPayloads.h"
+#include "RuntimeParameterUtils.h"
+#include "RuntimeStore.h"
+
+namespace
+{
+RuntimeEventRenderResetScope ToRuntimeEventRenderResetScope(RuntimeCoordinatorRenderResetScope scope)
+{
+	switch (scope)
+	{
+	case RuntimeCoordinatorRenderResetScope::TemporalHistoryOnly:
+		return RuntimeEventRenderResetScope::TemporalHistoryOnly;
+	case RuntimeCoordinatorRenderResetScope::TemporalHistoryAndFeedback:
+		return RuntimeEventRenderResetScope::TemporalHistoryAndFeedback;
+	case RuntimeCoordinatorRenderResetScope::None:
+	default:
+		return RuntimeEventRenderResetScope::None;
+	}
+}
+}
+
+RuntimeCoordinator::RuntimeCoordinator(RuntimeStore& runtimeStore, RuntimeEventDispatcher& runtimeEventDispatcher) :
+	mRuntimeStore(runtimeStore),
+	mRuntimeEventDispatcher(runtimeEventDispatcher)
+{
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::AddLayer(const std::string& shaderId)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	if (!ValidateShaderExists(shaderId, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("AddLayer", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.CreateStoredLayer(shaderId, error), error, true, true, true);
+	PublishCoordinatorResult("AddLayer", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::RemoveLayer(const std::string& layerId)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	if (!ValidateLayerExists(layerId, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("RemoveLayer", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.DeleteStoredLayer(layerId, error), error, true, true, true);
+	if (result.accepted)
+	{
+		result.transientOscInvalidation = RuntimeCoordinatorTransientOscInvalidation::Layer;
+		result.transientOscLayerKey = layerId;
+	}
+	PublishCoordinatorResult("RemoveLayer", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::MoveLayer(const std::string& layerId, int direction)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	bool shouldMove = false;
+	if (!ResolveLayerMove(layerId, direction, shouldMove, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("MoveLayer", result);
+		return result;
+	}
+	if (!shouldMove)
+	{
+		RuntimeCoordinatorResult result = BuildAcceptedNoReloadResult();
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.MoveStoredLayer(layerId, direction, error), error, true, true, true);
+	PublishCoordinatorResult("MoveLayer", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::MoveLayerToIndex(const std::string& layerId, std::size_t targetIndex)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	bool shouldMove = false;
+	if (!ResolveLayerMoveToIndex(layerId, targetIndex, shouldMove, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("MoveLayerToIndex", result);
+		return result;
+	}
+	if (!shouldMove)
+	{
+		RuntimeCoordinatorResult result = BuildAcceptedNoReloadResult();
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.MoveStoredLayerToIndex(layerId, targetIndex, error), error, true, true, true);
+	PublishCoordinatorResult("MoveLayerToIndex", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::SetLayerBypass(const std::string& layerId, bool bypassed)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	if (!ValidateLayerExists(layerId, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("SetLayerBypass", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.SetStoredLayerBypassState(layerId, bypassed, error), error, true, false, true);
+	PublishCoordinatorResult("SetLayerBypass", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::SetLayerShader(const std::string& layerId, const std::string& shaderId)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	if (!ValidateLayerExists(layerId, error) || !ValidateShaderExists(shaderId, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("SetLayerShader", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.SetStoredLayerShaderSelection(layerId, shaderId, error), error, true, false, true);
+	PublishCoordinatorResult("SetLayerShader", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::UpdateLayerParameter(const std::string& layerId, const std::string& parameterId, const JsonValue& newValue)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	ResolvedParameterMutation mutation;
+	if (!BuildParameterMutationById(layerId, parameterId, newValue, true, mutation, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("UpdateLayerParameter", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.SetStoredParameterValue(mutation.layerId, mutation.parameterId, mutation.value, mutation.persistState, error), error, false, false, mutation.persistState);
+	PublishCoordinatorResult("UpdateLayerParameter", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::UpdateLayerParameterByControlKey(const std::string& layerKey, const std::string& parameterKey, const JsonValue& newValue)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	ResolvedParameterMutation mutation;
+	if (!BuildParameterMutationByControlKey(layerKey, parameterKey, newValue, true, mutation, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("UpdateLayerParameterByControlKey", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.SetStoredParameterValue(mutation.layerId, mutation.parameterId, mutation.value, mutation.persistState, error), error, false, false, mutation.persistState);
+	PublishCoordinatorResult("UpdateLayerParameterByControlKey", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::CommitOscParameterByControlKey(const std::string& layerKey, const std::string& parameterKey, const JsonValue& newValue)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	constexpr RuntimeCoordinatorOscCommitPersistence kDefaultOscCommitPersistence =
+		RuntimeCoordinatorOscCommitPersistence::SessionOnly;
+	constexpr bool kPersistSettledOscCommits =
+		kDefaultOscCommitPersistence == RuntimeCoordinatorOscCommitPersistence::Persistent;
+
+	std::string error;
+	ResolvedParameterMutation mutation;
+	if (!BuildParameterMutationByControlKey(layerKey, parameterKey, newValue, kPersistSettledOscCommits, mutation, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("CommitOscParameterByControlKey", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.SetStoredParameterValue(mutation.layerId, mutation.parameterId, mutation.value, mutation.persistState, error), error, false, false, mutation.persistState);
+	PublishCoordinatorResult("CommitOscParameterByControlKey", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::ResetLayerParameters(const std::string& layerId)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	if (!ValidateLayerExists(layerId, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("ResetLayerParameters", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.ResetStoredLayerParameterValues(layerId, error), error, false, false, true);
+	if (!result.accepted)
+	{
+		PublishCoordinatorResult("ResetLayerParameters", result);
+		return result;
+	}
+
+	result.transientOscInvalidation = RuntimeCoordinatorTransientOscInvalidation::Layer;
+	result.transientOscLayerKey = layerId;
+	result.renderResetScope = RuntimeCoordinatorRenderResetScope::TemporalHistoryAndFeedback;
+	PublishCoordinatorResult("ResetLayerParameters", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::SaveStackPreset(const std::string& presetName)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	if (!ValidatePresetName(presetName, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("SaveStackPreset", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.SaveStackPresetSnapshot(presetName, error), error, false, false, true);
+	PublishCoordinatorResult("SaveStackPreset", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::LoadStackPreset(const std::string& presetName)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	std::string error;
+	if (!ValidatePresetName(presetName, error))
+	{
+		RuntimeCoordinatorResult result = ApplyStoreMutation(false, error, false, false, false);
+		PublishCoordinatorResult("LoadStackPreset", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = ApplyStoreMutation(mRuntimeStore.LoadStackPresetSnapshot(presetName, error), error, true, false, true);
+	PublishCoordinatorResult("LoadStackPreset", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::RequestShaderReload(bool preserveFeedbackState)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	PublishManualReloadRequested(preserveFeedbackState, "RequestShaderReload");
+	RuntimeCoordinatorResult result = BuildQueuedReloadResult(preserveFeedbackState);
+	PublishCoordinatorFollowUpEvents("RequestShaderReload", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::PollRuntimeStoreChanges(bool& registryChanged)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+
+	registryChanged = false;
+	bool reloadRequested = false;
+	std::string error;
+	if (!mRuntimeStore.PollStoredFileChanges(registryChanged, reloadRequested, error))
+	{
+		RuntimeCoordinatorResult result = HandleRuntimePollFailure(error);
+		return result;
+	}
+
+	if (reloadRequested)
+	{
+		PublishFileChangeDetected("PollRuntimeStoreChanges", registryChanged, reloadRequested);
+		RuntimeCoordinatorResult result = BuildQueuedReloadResult(false);
+		PublishCoordinatorFollowUpEvents("PollRuntimeStoreChanges", result);
+		return result;
+	}
+
+	if (registryChanged)
+	{
+		PublishFileChangeDetected("PollRuntimeStoreChanges", registryChanged, reloadRequested);
+		RuntimeCoordinatorResult result = BuildAcceptedNoReloadResult();
+		PublishCoordinatorFollowUpEvents("PollRuntimeStoreChanges", result);
+		return result;
+	}
+
+	RuntimeCoordinatorResult result;
+	result.accepted = true;
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::HandleRuntimePollFailure(const std::string& error)
+{
+	RuntimeCoordinatorResult result;
+	result.accepted = true;
+	result.runtimeStateBroadcastRequired = true;
+	result.compileStatusChanged = true;
+	result.compileStatusSucceeded = false;
+	result.compileStatusMessage = error;
+	PublishCoordinatorFollowUpEvents("HandleRuntimePollFailure", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::HandlePreparedShaderBuildFailure(const std::string& error)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mPreserveFeedbackOnNextShaderBuild = false;
+	mUseCommittedLayerStates = true;
+
+	RuntimeCoordinatorResult result;
+	result.accepted = true;
+	result.runtimeStateBroadcastRequired = true;
+	result.compileStatusChanged = true;
+	result.compileStatusSucceeded = false;
+	result.compileStatusMessage = error;
+	result.committedStateMode = RuntimeCoordinatorCommittedStateMode::UseCommittedStates;
+	PublishCoordinatorFollowUpEvents("HandlePreparedShaderBuildFailure", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::HandlePreparedShaderBuildSuccess()
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mUseCommittedLayerStates = false;
+
+	RuntimeCoordinatorResult result;
+	result.accepted = true;
+	result.runtimeStateBroadcastRequired = true;
+	result.compileStatusChanged = true;
+	result.compileStatusSucceeded = true;
+	result.compileStatusMessage = "Shader layers compiled successfully.";
+	result.committedStateMode = RuntimeCoordinatorCommittedStateMode::UseLiveSnapshots;
+	mPreserveFeedbackOnNextShaderBuild = false;
+	PublishCoordinatorFollowUpEvents("HandlePreparedShaderBuildSuccess", result);
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::HandleRuntimeReloadRequest()
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	PublishManualReloadRequested(false, "HandleRuntimeReloadRequest");
+	RuntimeCoordinatorResult result = BuildQueuedReloadResult(false);
+	PublishCoordinatorFollowUpEvents("HandleRuntimeReloadRequest", result);
+	return result;
+}
+
+void RuntimeCoordinator::ApplyCommittedStateMode(RuntimeCoordinatorCommittedStateMode mode)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	switch (mode)
+	{
+	case RuntimeCoordinatorCommittedStateMode::UseCommittedStates:
+		mUseCommittedLayerStates = true;
+		break;
+	case RuntimeCoordinatorCommittedStateMode::UseLiveSnapshots:
+		mUseCommittedLayerStates = false;
+		break;
+	case RuntimeCoordinatorCommittedStateMode::Unchanged:
+	default:
+		break;
+	}
+}
+
+bool RuntimeCoordinator::UseCommittedLayerStates() const
+{
+	return mUseCommittedLayerStates.load();
+}
+
+bool RuntimeCoordinator::PreserveFeedbackOnNextShaderBuild() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mPreserveFeedbackOnNextShaderBuild;
+}
+
+bool RuntimeCoordinator::BuildParameterMutationById(const std::string& layerId, const std::string& parameterId, const JsonValue& newValue,
+	bool persistState, ResolvedParameterMutation& mutation, std::string& error) const
+{
+	RuntimeStore::StoredParameterSnapshot snapshot;
+	if (!mRuntimeStore.TryGetStoredParameterById(layerId, parameterId, snapshot, error))
+		return false;
+
+	return BuildParameterMutationFromSnapshot(snapshot.layerId, snapshot.definition, snapshot.currentValue, snapshot.hasCurrentValue,
+		newValue, persistState, mutation, error);
+}
+
+bool RuntimeCoordinator::BuildParameterMutationByControlKey(const std::string& layerKey, const std::string& parameterKey, const JsonValue& newValue,
+	bool persistState, ResolvedParameterMutation& mutation, std::string& error) const
+{
+	RuntimeStore::StoredParameterSnapshot snapshot;
+	if (!mRuntimeStore.TryGetStoredParameterByControlKey(layerKey, parameterKey, snapshot, error))
+		return false;
+
+	return BuildParameterMutationFromSnapshot(snapshot.layerId, snapshot.definition, snapshot.currentValue, snapshot.hasCurrentValue,
+		newValue, persistState, mutation, error);
+}
+
+bool RuntimeCoordinator::BuildParameterMutationFromSnapshot(const std::string& layerId, const ShaderParameterDefinition& definition,
+	const ShaderParameterValue& currentValue, bool hasCurrentValue, const JsonValue& newValue,
+	bool persistState, ResolvedParameterMutation& mutation, std::string& error) const
+{
+	mutation.layerId = layerId;
+	mutation.parameterId = definition.id;
+	mutation.persistState = persistState;
+
+	if (definition.type == ShaderParameterType::Trigger)
+	{
+		const double previousCount = !hasCurrentValue || currentValue.numberValues.empty()
+			? 0.0
+			: currentValue.numberValues[0];
+		const double triggerTime = mRuntimeStore.GetRuntimeElapsedSeconds();
+		mutation.value.numberValues = { previousCount + 1.0, triggerTime };
+		mutation.persistState = false;
+		return true;
+	}
+
+	return NormalizeAndValidateParameterValue(definition, newValue, mutation.value, error);
+}
+
+bool RuntimeCoordinator::ValidateLayerExists(const std::string& layerId, std::string& error) const
+{
+	if (mRuntimeStore.HasStoredLayer(layerId))
+		return true;
+
+	error = "Unknown layer id: " + layerId;
+	return false;
+}
+
+bool RuntimeCoordinator::ValidateShaderExists(const std::string& shaderId, std::string& error) const
+{
+	if (mRuntimeStore.HasStoredShader(shaderId))
+		return true;
+
+	error = "Unknown shader id: " + shaderId;
+	return false;
+}
+
+bool RuntimeCoordinator::ResolveLayerMove(const std::string& layerId, int direction, bool& shouldMove, std::string& error) const
+{
+	return mRuntimeStore.ResolveStoredLayerMove(layerId, direction, shouldMove, error);
+}
+
+bool RuntimeCoordinator::ResolveLayerMoveToIndex(const std::string& layerId, std::size_t targetIndex, bool& shouldMove, std::string& error) const
+{
+	return mRuntimeStore.ResolveStoredLayerMoveToIndex(layerId, targetIndex, shouldMove, error);
+}
+
+bool RuntimeCoordinator::ValidatePresetName(const std::string& presetName, std::string& error) const
+{
+	if (mRuntimeStore.IsValidStackPresetName(presetName))
+		return true;
+
+	error = "Preset name must include at least one letter or number.";
+	return false;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::ApplyStoreMutation(bool succeeded, const std::string& errorMessage, bool reloadRequired, bool preserveFeedbackState, bool persistenceRequested)
+{
+	if (!succeeded)
+	{
+		RuntimeCoordinatorResult result;
+		result.accepted = false;
+		result.errorMessage = errorMessage;
+		return result;
+	}
+
+	if (reloadRequired)
+	{
+		RuntimeCoordinatorResult result = BuildQueuedReloadResult(preserveFeedbackState);
+		result.persistenceRequested = persistenceRequested;
+		return result;
+	}
+
+	RuntimeCoordinatorResult result = BuildAcceptedNoReloadResult();
+	result.persistenceRequested = persistenceRequested;
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::BuildQueuedReloadResult(bool preserveFeedbackState)
+{
+	mPreserveFeedbackOnNextShaderBuild = preserveFeedbackState;
+	mUseCommittedLayerStates = true;
+
+	RuntimeCoordinatorResult result;
+	result.accepted = true;
+	result.runtimeStateBroadcastRequired = true;
+	result.shaderBuildRequested = true;
+	result.compileStatusChanged = true;
+	result.compileStatusSucceeded = true;
+	result.compileStatusMessage = "Shader rebuild queued.";
+	result.clearReloadRequest = true;
+	result.committedStateMode = RuntimeCoordinatorCommittedStateMode::UseCommittedStates;
+	return result;
+}
+
+RuntimeCoordinatorResult RuntimeCoordinator::BuildAcceptedNoReloadResult() const
+{
+	RuntimeCoordinatorResult result;
+	result.accepted = true;
+	result.runtimeStateBroadcastRequired = true;
+	return result;
+}
+
+void RuntimeCoordinator::PublishFileChangeDetected(const std::string& reason, bool registryChanged, bool reloadRequested) const
+{
+	try
+	{
+		FileChangeDetectedEvent event;
+		event.path = reason;
+		event.shaderPackageCandidate = registryChanged || reloadRequested;
+		event.runtimeConfigCandidate = false;
+		event.presetCandidate = false;
+		mRuntimeEventDispatcher.PublishPayload(event, "RuntimeCoordinator");
+	}
+	catch (...)
+	{
+	}
+}
+
+void RuntimeCoordinator::PublishManualReloadRequested(bool preserveFeedbackState, const std::string& reason) const
+{
+	try
+	{
+		ManualReloadRequestedEvent event;
+		event.preserveFeedbackState = preserveFeedbackState;
+		event.reason = reason;
+		mRuntimeEventDispatcher.PublishPayload(event, "RuntimeCoordinator");
+	}
+	catch (...)
+	{
+	}
+}
+
+void RuntimeCoordinator::PublishCoordinatorResult(const std::string& action, const RuntimeCoordinatorResult& result) const
+{
+	try
+	{
+		RuntimeMutationEvent mutation;
+		mutation.action = action;
+		mutation.accepted = result.accepted;
+		mutation.runtimeStateChanged = result.accepted && result.runtimeStateBroadcastRequired;
+		mutation.runtimeStateBroadcastRequired = result.runtimeStateBroadcastRequired;
+		mutation.shaderBuildRequested = result.shaderBuildRequested;
+		mutation.persistenceRequested = result.persistenceRequested;
+		mutation.clearTransientOscState = result.transientOscInvalidation != RuntimeCoordinatorTransientOscInvalidation::None;
+		mutation.renderResetScope = ToRuntimeEventRenderResetScope(result.renderResetScope);
+		mutation.errorMessage = result.errorMessage;
+		mRuntimeEventDispatcher.PublishPayload(mutation, "RuntimeCoordinator");
+
+		PublishCoordinatorFollowUpEvents(action, result);
+	}
+	catch (...)
+	{
+	}
+}
+
+void RuntimeCoordinator::PublishCoordinatorFollowUpEvents(const std::string& action, const RuntimeCoordinatorResult& result) const
+{
+	try
+	{
+		if (!result.accepted)
+			return;
+
+		if (result.runtimeStateBroadcastRequired)
+		{
+			RuntimeStateChangedEvent stateChanged;
+			stateChanged.reason = action;
+			stateChanged.renderVisible = result.renderResetScope != RuntimeCoordinatorRenderResetScope::None;
+			stateChanged.persistenceRequested = result.persistenceRequested;
+			mRuntimeEventDispatcher.PublishPayload(stateChanged, "RuntimeCoordinator");
+		}
+
+		if (result.persistenceRequested)
+		{
+			RuntimePersistenceRequestedEvent persistenceRequested;
+			persistenceRequested.request = PersistenceRequest::RuntimeStateRequest(action);
+			mRuntimeEventDispatcher.PublishPayload(persistenceRequested, "RuntimeCoordinator");
+		}
+
+		if (result.shaderBuildRequested)
+		{
+			RuntimeReloadRequestedEvent reloadRequested;
+			reloadRequested.preserveFeedbackState = mPreserveFeedbackOnNextShaderBuild;
+			reloadRequested.reason = action;
+			mRuntimeEventDispatcher.PublishPayload(reloadRequested, "RuntimeCoordinator");
+
+			ShaderBuildEvent shaderBuild;
+			shaderBuild.phase = RuntimeEventShaderBuildPhase::Requested;
+			shaderBuild.preserveFeedbackState = mPreserveFeedbackOnNextShaderBuild;
+			shaderBuild.succeeded = true;
+			shaderBuild.message = result.compileStatusMessage;
+			mRuntimeEventDispatcher.PublishPayload(shaderBuild, "RuntimeCoordinator");
+		}
+
+		if (result.compileStatusChanged)
+		{
+			CompileStatusChangedEvent compileStatus;
+			compileStatus.succeeded = result.compileStatusSucceeded;
+			compileStatus.message = result.compileStatusMessage;
+			mRuntimeEventDispatcher.PublishPayload(compileStatus, "RuntimeCoordinator");
+		}
+	}
+	catch (...)
+	{
+	}
+}

apps/LoopThroughWithOpenGLCompositing/runtime/coordination/RuntimeCoordinator.h

@@ -0,0 +1,120 @@
+#pragma once
+
+#include "RuntimeJson.h"
+#include "ShaderTypes.h"
+
+#include <atomic>
+#include <cstddef>
+#include <mutex>
+#include <string>
+
+class RuntimeStore;
+class RuntimeEventDispatcher;
+
+enum class RuntimeCoordinatorCommittedStateMode
+{
+	Unchanged,
+	UseCommittedStates,
+	UseLiveSnapshots
+};
+
+enum class RuntimeCoordinatorRenderResetScope
+{
+	None,
+	TemporalHistoryOnly,
+	TemporalHistoryAndFeedback
+};
+
+enum class RuntimeCoordinatorTransientOscInvalidation
+{
+	None,
+	Layer,
+	All
+};
+
+enum class RuntimeCoordinatorOscCommitPersistence
+{
+	SessionOnly,
+	Persistent
+};
+
+struct RuntimeCoordinatorResult
+{
+	bool accepted = false;
+	bool runtimeStateBroadcastRequired = false;
+	bool shaderBuildRequested = false;
+	bool persistenceRequested = false;
+	bool compileStatusChanged = false;
+	bool compileStatusSucceeded = false;
+	bool clearReloadRequest = false;
+	RuntimeCoordinatorCommittedStateMode committedStateMode = RuntimeCoordinatorCommittedStateMode::Unchanged;
+	RuntimeCoordinatorRenderResetScope renderResetScope = RuntimeCoordinatorRenderResetScope::None;
+	RuntimeCoordinatorTransientOscInvalidation transientOscInvalidation = RuntimeCoordinatorTransientOscInvalidation::None;
+	std::string transientOscLayerKey;
+	std::string compileStatusMessage;
+	std::string errorMessage;
+};
+
+class RuntimeCoordinator
+{
+public:
+	RuntimeCoordinator(RuntimeStore& runtimeStore, RuntimeEventDispatcher& runtimeEventDispatcher);
+
+	RuntimeCoordinatorResult AddLayer(const std::string& shaderId);
+	RuntimeCoordinatorResult RemoveLayer(const std::string& layerId);
+	RuntimeCoordinatorResult MoveLayer(const std::string& layerId, int direction);
+	RuntimeCoordinatorResult MoveLayerToIndex(const std::string& layerId, std::size_t targetIndex);
+	RuntimeCoordinatorResult SetLayerBypass(const std::string& layerId, bool bypassed);
+	RuntimeCoordinatorResult SetLayerShader(const std::string& layerId, const std::string& shaderId);
+	RuntimeCoordinatorResult UpdateLayerParameter(const std::string& layerId, const std::string& parameterId, const JsonValue& newValue);
+	RuntimeCoordinatorResult UpdateLayerParameterByControlKey(const std::string& layerKey, const std::string& parameterKey, const JsonValue& newValue);
+	RuntimeCoordinatorResult CommitOscParameterByControlKey(const std::string& layerKey, const std::string& parameterKey, const JsonValue& newValue);
+	RuntimeCoordinatorResult ResetLayerParameters(const std::string& layerId);
+	RuntimeCoordinatorResult SaveStackPreset(const std::string& presetName);
+	RuntimeCoordinatorResult LoadStackPreset(const std::string& presetName);
+
+	RuntimeCoordinatorResult RequestShaderReload(bool preserveFeedbackState = false);
+	RuntimeCoordinatorResult PollRuntimeStoreChanges(bool& registryChanged);
+	RuntimeCoordinatorResult HandleRuntimePollFailure(const std::string& error);
+	RuntimeCoordinatorResult HandlePreparedShaderBuildFailure(const std::string& error);
+	RuntimeCoordinatorResult HandlePreparedShaderBuildSuccess();
+	RuntimeCoordinatorResult HandleRuntimeReloadRequest();
+	void ApplyCommittedStateMode(RuntimeCoordinatorCommittedStateMode mode);
+	bool UseCommittedLayerStates() const;
+	bool PreserveFeedbackOnNextShaderBuild() const;
+
+private:
+	struct ResolvedParameterMutation
+	{
+		std::string layerId;
+		std::string parameterId;
+		ShaderParameterValue value;
+		bool persistState = true;
+	};
+
+	bool BuildParameterMutationById(const std::string& layerId, const std::string& parameterId, const JsonValue& newValue,
+		bool persistState, ResolvedParameterMutation& mutation, std::string& error) const;
+	bool BuildParameterMutationByControlKey(const std::string& layerKey, const std::string& parameterKey, const JsonValue& newValue,
+		bool persistState, ResolvedParameterMutation& mutation, std::string& error) const;
+	bool BuildParameterMutationFromSnapshot(const std::string& layerId, const ShaderParameterDefinition& definition,
+		const ShaderParameterValue& currentValue, bool hasCurrentValue, const JsonValue& newValue,
+		bool persistState, ResolvedParameterMutation& mutation, std::string& error) const;
+	bool ValidateLayerExists(const std::string& layerId, std::string& error) const;
+	bool ValidateShaderExists(const std::string& shaderId, std::string& error) const;
+	bool ResolveLayerMove(const std::string& layerId, int direction, bool& shouldMove, std::string& error) const;
+	bool ResolveLayerMoveToIndex(const std::string& layerId, std::size_t targetIndex, bool& shouldMove, std::string& error) const;
+	bool ValidatePresetName(const std::string& presetName, std::string& error) const;
+	RuntimeCoordinatorResult ApplyStoreMutation(bool succeeded, const std::string& errorMessage, bool reloadRequired, bool preserveFeedbackState, bool persistenceRequested);
+	RuntimeCoordinatorResult BuildQueuedReloadResult(bool preserveFeedbackState);
+	RuntimeCoordinatorResult BuildAcceptedNoReloadResult() const;
+	void PublishFileChangeDetected(const std::string& reason, bool registryChanged, bool reloadRequested) const;
+	void PublishManualReloadRequested(bool preserveFeedbackState, const std::string& reason) const;
+	void PublishCoordinatorResult(const std::string& action, const RuntimeCoordinatorResult& result) const;
+	void PublishCoordinatorFollowUpEvents(const std::string& action, const RuntimeCoordinatorResult& result) const;
+
+	RuntimeStore& mRuntimeStore;
+	RuntimeEventDispatcher& mRuntimeEventDispatcher;
+	mutable std::mutex mMutex;
+	bool mPreserveFeedbackOnNextShaderBuild = false;
+	std::atomic<bool> mUseCommittedLayerStates{ false };
+};

apps/LoopThroughWithOpenGLCompositing/runtime/events/RuntimeEvent.h

@@ -0,0 +1,87 @@
+#pragma once
+
+#include "RuntimeEventPayloads.h"
+
+#include <chrono>
+#include <cstdint>
+#include <string>
+#include <type_traits>
+#include <utility>
+#include <variant>
+
+using RuntimeEventPayload = std::variant<
+	std::monostate,
+	OscValueReceivedEvent,
+	OscValueCoalescedEvent,
+	OscCommitRequestedEvent,
+	HttpControlMutationRequestedEvent,
+	WebSocketClientConnectedEvent,
+	RuntimeStateBroadcastRequestedEvent,
+	FileChangeDetectedEvent,
+	ManualReloadRequestedEvent,
+	RuntimeMutationEvent,
+	RuntimeStateChangedEvent,
+	RuntimePersistenceRequestedEvent,
+	RuntimeReloadRequestedEvent,
+	ShaderPackagesChangedEvent,
+	RenderSnapshotPublishRequestedEvent,
+	RuntimeStatePresentationChangedEvent,
+	ShaderBuildEvent,
+	CompileStatusChangedEvent,
+	RenderSnapshotPublishedEvent,
+	RenderResetEvent,
+	OscOverlayEvent,
+	FrameRenderedEvent,
+	PreviewFrameAvailableEvent,
+	InputSignalChangedEvent,
+	InputFrameArrivedEvent,
+	OutputFrameScheduledEvent,
+	OutputFrameCompletedEvent,
+	BackendStateChangedEvent,
+	SubsystemWarningEvent,
+	SubsystemRecoveredEvent,
+	TimingSampleRecordedEvent,
+	QueueDepthChangedEvent>;
+
+inline RuntimeEventType RuntimeEventPayloadType(const RuntimeEventPayload& payload)
+{
+	return std::visit([](const auto& value) -> RuntimeEventType {
+		using PayloadType = std::decay_t<decltype(value)>;
+		if constexpr (std::is_same_v<PayloadType, std::monostate>)
+			return RuntimeEventType::Unknown;
+		else
+			return RuntimeEventPayloadType(value);
+	}, payload);
+}
+
+struct RuntimeEvent
+{
+	RuntimeEventType type = RuntimeEventType::Unknown;
+	uint64_t sequence = 0;
+	std::chrono::steady_clock::time_point createdAt = std::chrono::steady_clock::now();
+	std::string source;
+	RuntimeEventPayload payload;
+
+	bool HasPayload() const
+	{
+		return !std::holds_alternative<std::monostate>(payload);
+	}
+
+	bool PayloadMatchesType() const
+	{
+		return RuntimeEventPayloadType(payload) == type;
+	}
+};
+
+template <typename Payload>
+RuntimeEvent MakeRuntimeEvent(Payload payload, std::string source = {}, uint64_t sequence = 0,
+	std::chrono::steady_clock::time_point createdAt = std::chrono::steady_clock::now())
+{
+	RuntimeEvent event;
+	event.type = RuntimeEventPayloadType(payload);
+	event.sequence = sequence;
+	event.createdAt = createdAt;
+	event.source = std::move(source);
+	event.payload = std::move(payload);
+	return event;
+}

apps/LoopThroughWithOpenGLCompositing/runtime/events/RuntimeEventCoalescingQueue.h

@@ -0,0 +1,158 @@
+#pragma once
+
+#include "RuntimeEvent.h"
+
+#include <chrono>
+#include <cstddef>
+#include <deque>
+#include <functional>
+#include <map>
+#include <mutex>
+#include <string>
+#include <utility>
+#include <vector>
+
+struct RuntimeEventCoalescingQueueMetrics
+{
+	std::size_t depth = 0;
+	std::size_t capacity = 0;
+	std::size_t droppedCount = 0;
+	std::size_t coalescedCount = 0;
+	double oldestEventAgeMilliseconds = 0.0;
+};
+
+inline std::string RuntimeEventDefaultCoalescingKey(const RuntimeEvent& event)
+{
+	if (const auto* payload = std::get_if<OscValueReceivedEvent>(&event.payload))
+		return std::string(RuntimeEventTypeName(event.type)) + ":" + payload->routeKey;
+	if (const auto* payload = std::get_if<OscCommitRequestedEvent>(&event.payload))
+		return std::string(RuntimeEventTypeName(event.type)) + ":" + payload->routeKey;
+	if (const auto* payload = std::get_if<FileChangeDetectedEvent>(&event.payload))
+		return std::string(RuntimeEventTypeName(event.type)) + ":" + payload->path;
+	if (const auto* payload = std::get_if<ShaderBuildEvent>(&event.payload))
+		return std::string(RuntimeEventTypeName(event.type)) + ":" +
+			std::to_string(payload->inputWidth) + "x" +
+			std::to_string(payload->inputHeight) + ":" +
+			(payload->preserveFeedbackState ? "preserve" : "reset");
+	if (const auto* payload = std::get_if<RenderSnapshotPublishRequestedEvent>(&event.payload))
+		return std::string(RuntimeEventTypeName(event.type)) + ":" +
+			std::to_string(payload->outputWidth) + "x" +
+			std::to_string(payload->outputHeight);
+	if (const auto* payload = std::get_if<TimingSampleRecordedEvent>(&event.payload))
+		return std::string(RuntimeEventTypeName(event.type)) + ":" + payload->subsystem + ":" + payload->metric;
+	if (const auto* payload = std::get_if<QueueDepthChangedEvent>(&event.payload))
+		return std::string(RuntimeEventTypeName(event.type)) + ":" + payload->queueName;
+
+	return std::string(RuntimeEventTypeName(event.type));
+}
+
+class RuntimeEventCoalescingQueue
+{
+public:
+	using KeySelector = std::function<std::string(const RuntimeEvent&)>;
+
+	explicit RuntimeEventCoalescingQueue(std::size_t capacity = 256, KeySelector keySelector = RuntimeEventDefaultCoalescingKey) :
+		mCapacity(capacity),
+		mKeySelector(std::move(keySelector))
+	{
+	}
+
+	bool Push(RuntimeEvent event)
+	{
+		const std::string key = mKeySelector(event);
+		if (key.empty())
+			return false;
+
+		std::lock_guard<std::mutex> lock(mMutex);
+		auto found = mEntries.find(key);
+		if (found != mEntries.end())
+		{
+			const auto firstCreatedAt = found->second.event.createdAt;
+			found->second.event = std::move(event);
+			found->second.event.createdAt = firstCreatedAt;
+			++found->second.coalescedCount;
+			++mCoalescedCount;
+			return true;
+		}
+
+		if (mEntries.size() >= mCapacity)
+		{
+			++mDroppedCount;
+			return false;
+		}
+
+		mOrder.push_back(key);
+		Entry entry;
+		entry.event = std::move(event);
+		mEntries.emplace(key, std::move(entry));
+		return true;
+	}
+
+	std::vector<RuntimeEvent> Drain(std::size_t maxEvents = 0)
+	{
+		std::vector<RuntimeEvent> events;
+
+		std::lock_guard<std::mutex> lock(mMutex);
+		const std::size_t count = maxEvents == 0 || maxEvents > mOrder.size() ? mOrder.size() : maxEvents;
+		events.reserve(count);
+
+		for (std::size_t index = 0; index < count; ++index)
+		{
+			const std::string key = std::move(mOrder.front());
+			mOrder.pop_front();
+
+			auto found = mEntries.find(key);
+			if (found == mEntries.end())
+				continue;
+
+			events.push_back(std::move(found->second.event));
+			mEntries.erase(found);
+		}
+
+		return events;
+	}
+
+	RuntimeEventCoalescingQueueMetrics GetMetrics(std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now()) const
+	{
+		std::lock_guard<std::mutex> lock(mMutex);
+
+		RuntimeEventCoalescingQueueMetrics metrics;
+		metrics.depth = mEntries.size();
+		metrics.capacity = mCapacity;
+		metrics.droppedCount = mDroppedCount;
+		metrics.coalescedCount = mCoalescedCount;
+
+		if (!mOrder.empty())
+		{
+			const auto found = mEntries.find(mOrder.front());
+			if (found != mEntries.end())
+			{
+				const auto age = now - found->second.event.createdAt;
+				metrics.oldestEventAgeMilliseconds = std::chrono::duration<double, std::milli>(age).count();
+			}
+		}
+
+		return metrics;
+	}
+
+	std::size_t Depth() const
+	{
+		std::lock_guard<std::mutex> lock(mMutex);
+		return mEntries.size();
+	}
+
+private:
+	struct Entry
+	{
+		RuntimeEvent event;
+		std::size_t coalescedCount = 0;
+	};
+
+	mutable std::mutex mMutex;
+	std::size_t mCapacity = 0;
+	KeySelector mKeySelector;
+	std::deque<std::string> mOrder;
+	std::map<std::string, Entry> mEntries;
+	std::size_t mDroppedCount = 0;
+	std::size_t mCoalescedCount = 0;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/events/RuntimeEventDispatcher.h

@@ -0,0 +1,170 @@
+#pragma once
+
+#include "RuntimeEventCoalescingQueue.h"
+#include "RuntimeEventQueue.h"
+
+#include <algorithm>
+#include <atomic>
+#include <functional>
+#include <map>
+#include <mutex>
+#include <vector>
+
+struct RuntimeEventDispatchResult
+{
+	std::size_t dispatchedEvents = 0;
+	std::size_t handlerInvocations = 0;
+	std::size_t handlerFailures = 0;
+	double dispatchDurationMilliseconds = 0.0;
+};
+
+class RuntimeEventDispatcher
+{
+public:
+	using Handler = std::function<void(const RuntimeEvent&)>;
+
+	explicit RuntimeEventDispatcher(std::size_t queueCapacity = 1024) :
+		mQueue(queueCapacity),
+		mCoalescingQueue(queueCapacity)
+	{
+	}
+
+	bool Publish(RuntimeEvent event)
+	{
+		if (!event.PayloadMatchesType())
+			return false;
+
+		if (event.sequence == 0)
+			event.sequence = mNextSequence.fetch_add(1);
+
+		if (ShouldCoalesce(event))
+			return mCoalescingQueue.Push(std::move(event));
+
+		return mQueue.Push(std::move(event));
+	}
+
+	template <typename Payload>
+	bool PublishPayload(Payload payload, std::string source = {})
+	{
+		return Publish(MakeRuntimeEvent(std::move(payload), std::move(source)));
+	}
+
+	void Subscribe(RuntimeEventType type, Handler handler)
+	{
+		std::lock_guard<std::mutex> lock(mHandlerMutex);
+		mHandlers[type].push_back(std::move(handler));
+	}
+
+	void SubscribeAll(Handler handler)
+	{
+		std::lock_guard<std::mutex> lock(mHandlerMutex);
+		mAllHandlers.push_back(std::move(handler));
+	}
+
+	RuntimeEventDispatchResult DispatchPending(std::size_t maxEvents = 0)
+	{
+		const auto startedAt = std::chrono::steady_clock::now();
+		RuntimeEventDispatchResult result;
+		FlushCoalescedToFifo(maxEvents);
+		std::vector<RuntimeEvent> events = mQueue.Drain(maxEvents);
+		result.dispatchedEvents = events.size();
+
+		for (const RuntimeEvent& event : events)
+		{
+			std::vector<Handler> handlers = HandlersFor(event.type);
+			result.handlerInvocations += handlers.size();
+
+			for (const Handler& handler : handlers)
+			{
+				try
+				{
+					handler(event);
+				}
+				catch (...)
+				{
+					++result.handlerFailures;
+				}
+			}
+		}
+
+		result.dispatchDurationMilliseconds =
+			std::chrono::duration<double, std::milli>(std::chrono::steady_clock::now() - startedAt).count();
+		return result;
+	}
+
+	bool TryPop(RuntimeEvent& event)
+	{
+		return mQueue.TryPop(event);
+	}
+
+	RuntimeEventQueueMetrics GetQueueMetrics(std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now()) const
+	{
+		RuntimeEventQueueMetrics metrics = mQueue.GetMetrics(now);
+		const RuntimeEventCoalescingQueueMetrics coalescingMetrics = mCoalescingQueue.GetMetrics(now);
+		if (metrics.depth == 0)
+			metrics.oldestEventAgeMilliseconds = coalescingMetrics.oldestEventAgeMilliseconds;
+		else if (coalescingMetrics.depth > 0)
+			metrics.oldestEventAgeMilliseconds = (std::max)(metrics.oldestEventAgeMilliseconds, coalescingMetrics.oldestEventAgeMilliseconds);
+		metrics.depth += coalescingMetrics.depth;
+		metrics.capacity += coalescingMetrics.capacity;
+		metrics.droppedCount += coalescingMetrics.droppedCount;
+		metrics.coalescedCount = coalescingMetrics.coalescedCount;
+		return metrics;
+	}
+
+	std::size_t QueueDepth() const
+	{
+		return mQueue.Depth() + mCoalescingQueue.Depth();
+	}
+
+private:
+	static bool ShouldCoalesce(const RuntimeEvent& event)
+	{
+		switch (event.type)
+		{
+		case RuntimeEventType::OscValueReceived:
+		case RuntimeEventType::OscCommitRequested:
+		case RuntimeEventType::RuntimeStateBroadcastRequested:
+		case RuntimeEventType::FileChangeDetected:
+		case RuntimeEventType::RuntimeReloadRequested:
+		case RuntimeEventType::ShaderBuildRequested:
+		case RuntimeEventType::RenderSnapshotPublishRequested:
+		case RuntimeEventType::TimingSampleRecorded:
+		case RuntimeEventType::QueueDepthChanged:
+			return true;
+		default:
+			return false;
+		}
+	}
+
+	void FlushCoalescedToFifo(std::size_t maxEvents)
+	{
+		const std::size_t fifoDepth = mQueue.Depth();
+		if (maxEvents != 0 && fifoDepth >= maxEvents)
+			return;
+
+		const std::size_t flushLimit = maxEvents == 0 ? 0 : maxEvents - fifoDepth;
+		std::vector<RuntimeEvent> events = mCoalescingQueue.Drain(flushLimit);
+		for (RuntimeEvent& event : events)
+			mQueue.Push(std::move(event));
+	}
+
+	std::vector<Handler> HandlersFor(RuntimeEventType type) const
+	{
+		std::lock_guard<std::mutex> lock(mHandlerMutex);
+		std::vector<Handler> handlers = mAllHandlers;
+
+		const auto found = mHandlers.find(type);
+		if (found != mHandlers.end())
+			handlers.insert(handlers.end(), found->second.begin(), found->second.end());
+
+		return handlers;
+	}
+
+	RuntimeEventQueue mQueue;
+	RuntimeEventCoalescingQueue mCoalescingQueue;
+	std::atomic<uint64_t> mNextSequence{ 1 };
+	mutable std::mutex mHandlerMutex;
+	std::map<RuntimeEventType, std::vector<Handler>> mHandlers;
+	std::vector<Handler> mAllHandlers;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/events/RuntimeEventPayloads.h

@@ -0,0 +1,442 @@
+#pragma once
+
+#include "RuntimeEventType.h"
+
+#include <cstddef>
+#include <cstdint>
+#include "PersistenceRequest.h"
+
+#include <string>
+
+enum class RuntimeEventSeverity
+{
+	Debug,
+	Info,
+	Warning,
+	Error
+};
+
+enum class RuntimeEventRenderResetScope
+{
+	None,
+	TemporalHistoryOnly,
+	TemporalHistoryAndFeedback
+};
+
+enum class RuntimeEventShaderBuildPhase
+{
+	Requested,
+	Prepared,
+	Applied,
+	Failed
+};
+
+struct OscValueReceivedEvent
+{
+	std::string routeKey;
+	std::string layerKey;
+	std::string parameterKey;
+	std::string valueJson;
+	uint64_t generation = 0;
+};
+
+struct OscValueCoalescedEvent
+{
+	std::string routeKey;
+	std::size_t coalescedCount = 0;
+	uint64_t latestGeneration = 0;
+};
+
+struct OscCommitRequestedEvent
+{
+	std::string routeKey;
+	std::string layerKey;
+	std::string parameterKey;
+	std::string valueJson;
+	uint64_t generation = 0;
+};
+
+struct HttpControlMutationRequestedEvent
+{
+	std::string method;
+	std::string path;
+	std::string bodyJson;
+};
+
+struct WebSocketClientConnectedEvent
+{
+	std::string clientId;
+	std::size_t connectedClientCount = 0;
+};
+
+struct RuntimeStateBroadcastRequestedEvent
+{
+	std::string reason;
+	bool coalescable = true;
+};
+
+struct FileChangeDetectedEvent
+{
+	std::string path;
+	bool shaderPackageCandidate = false;
+	bool runtimeConfigCandidate = false;
+	bool presetCandidate = false;
+};
+
+struct ManualReloadRequestedEvent
+{
+	bool preserveFeedbackState = false;
+	std::string reason;
+};
+
+struct RuntimeMutationEvent
+{
+	std::string action;
+	bool accepted = false;
+	bool runtimeStateChanged = false;
+	bool runtimeStateBroadcastRequired = false;
+	bool shaderBuildRequested = false;
+	bool persistenceRequested = false;
+	bool clearTransientOscState = false;
+	RuntimeEventRenderResetScope renderResetScope = RuntimeEventRenderResetScope::None;
+	std::string errorMessage;
+};
+
+struct RuntimeStateChangedEvent
+{
+	std::string reason;
+	bool renderVisible = false;
+	bool persistenceRequested = false;
+};
+
+struct RuntimePersistenceRequestedEvent
+{
+	PersistenceRequest request;
+};
+
+struct RuntimeReloadRequestedEvent
+{
+	bool preserveFeedbackState = false;
+	std::string reason;
+};
+
+struct ShaderPackagesChangedEvent
+{
+	bool registryChanged = false;
+	std::size_t packageCount = 0;
+	std::string reason;
+};
+
+struct RenderSnapshotPublishRequestedEvent
+{
+	unsigned inputWidth = 0;
+	unsigned inputHeight = 0;
+	unsigned outputWidth = 0;
+	unsigned outputHeight = 0;
+	std::string reason;
+};
+
+struct RuntimeStatePresentationChangedEvent
+{
+	std::string reason;
+};
+
+struct ShaderBuildEvent
+{
+	RuntimeEventShaderBuildPhase phase = RuntimeEventShaderBuildPhase::Requested;
+	uint64_t generation = 0;
+	unsigned inputWidth = 0;
+	unsigned inputHeight = 0;
+	bool preserveFeedbackState = false;
+	bool succeeded = false;
+	std::string message;
+};
+
+struct CompileStatusChangedEvent
+{
+	bool succeeded = false;
+	std::string message;
+};
+
+struct RenderSnapshotPublishedEvent
+{
+	uint64_t snapshotVersion = 0;
+	uint64_t structureVersion = 0;
+	uint64_t parameterVersion = 0;
+	uint64_t packageVersion = 0;
+	unsigned outputWidth = 0;
+	unsigned outputHeight = 0;
+	std::size_t layerCount = 0;
+};
+
+struct RenderResetEvent
+{
+	RuntimeEventRenderResetScope scope = RuntimeEventRenderResetScope::None;
+	bool applied = false;
+	std::string reason;
+};
+
+struct OscOverlayEvent
+{
+	std::string routeKey;
+	std::string layerKey;
+	std::string parameterKey;
+	uint64_t generation = 0;
+	bool settled = false;
+};
+
+struct FrameRenderedEvent
+{
+	uint64_t frameIndex = 0;
+	double renderMilliseconds = 0.0;
+};
+
+struct PreviewFrameAvailableEvent
+{
+	uint64_t frameIndex = 0;
+	unsigned width = 0;
+	unsigned height = 0;
+};
+
+struct InputSignalChangedEvent
+{
+	bool hasSignal = false;
+	unsigned width = 0;
+	unsigned height = 0;
+	std::string modeName;
+};
+
+struct InputFrameArrivedEvent
+{
+	uint64_t frameIndex = 0;
+	unsigned width = 0;
+	unsigned height = 0;
+	long rowBytes = 0;
+	std::string pixelFormat;
+	bool hasNoInputSource = false;
+};
+
+struct OutputFrameScheduledEvent
+{
+	uint64_t frameIndex = 0;
+	int64_t streamTime = 0;
+	int64_t duration = 0;
+	int64_t timeScale = 0;
+};
+
+struct OutputFrameCompletedEvent
+{
+	uint64_t frameIndex = 0;
+	std::string result;
+};
+
+struct BackendStateChangedEvent
+{
+	std::string backendName;
+	std::string state;
+	std::string message;
+};
+
+struct SubsystemWarningEvent
+{
+	std::string subsystem;
+	std::string warningKey;
+	RuntimeEventSeverity severity = RuntimeEventSeverity::Warning;
+	std::string message;
+	bool cleared = false;
+};
+
+struct SubsystemRecoveredEvent
+{
+	std::string subsystem;
+	std::string recoveryKey;
+	std::string message;
+};
+
+struct TimingSampleRecordedEvent
+{
+	std::string subsystem;
+	std::string metric;
+	double value = 0.0;
+	std::string unit;
+};
+
+struct QueueDepthChangedEvent
+{
+	std::string queueName;
+	std::size_t depth = 0;
+	std::size_t capacity = 0;
+	std::size_t droppedCount = 0;
+	std::size_t coalescedCount = 0;
+};
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const OscValueReceivedEvent&)
+{
+	return RuntimeEventType::OscValueReceived;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const OscValueCoalescedEvent&)
+{
+	return RuntimeEventType::OscValueCoalesced;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const OscCommitRequestedEvent&)
+{
+	return RuntimeEventType::OscCommitRequested;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const HttpControlMutationRequestedEvent&)
+{
+	return RuntimeEventType::HttpControlMutationRequested;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const WebSocketClientConnectedEvent&)
+{
+	return RuntimeEventType::WebSocketClientConnected;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const RuntimeStateBroadcastRequestedEvent&)
+{
+	return RuntimeEventType::RuntimeStateBroadcastRequested;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const FileChangeDetectedEvent&)
+{
+	return RuntimeEventType::FileChangeDetected;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const ManualReloadRequestedEvent&)
+{
+	return RuntimeEventType::ManualReloadRequested;
+}
+
+inline RuntimeEventType RuntimeEventPayloadType(const RuntimeMutationEvent& event)
+{
+	return event.accepted ? RuntimeEventType::RuntimeMutationAccepted : RuntimeEventType::RuntimeMutationRejected;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const RuntimeStateChangedEvent&)
+{
+	return RuntimeEventType::RuntimeStateChanged;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const RuntimePersistenceRequestedEvent&)
+{
+	return RuntimeEventType::RuntimePersistenceRequested;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const RuntimeReloadRequestedEvent&)
+{
+	return RuntimeEventType::RuntimeReloadRequested;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const ShaderPackagesChangedEvent&)
+{
+	return RuntimeEventType::ShaderPackagesChanged;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const RenderSnapshotPublishRequestedEvent&)
+{
+	return RuntimeEventType::RenderSnapshotPublishRequested;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const RuntimeStatePresentationChangedEvent&)
+{
+	return RuntimeEventType::RuntimeStatePresentationChanged;
+}
+
+inline RuntimeEventType RuntimeEventPayloadType(const ShaderBuildEvent& event)
+{
+	switch (event.phase)
+	{
+	case RuntimeEventShaderBuildPhase::Requested:
+		return RuntimeEventType::ShaderBuildRequested;
+	case RuntimeEventShaderBuildPhase::Prepared:
+		return RuntimeEventType::ShaderBuildPrepared;
+	case RuntimeEventShaderBuildPhase::Applied:
+		return RuntimeEventType::ShaderBuildApplied;
+	case RuntimeEventShaderBuildPhase::Failed:
+		return RuntimeEventType::ShaderBuildFailed;
+	}
+
+	return RuntimeEventType::ShaderBuildRequested;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const CompileStatusChangedEvent&)
+{
+	return RuntimeEventType::CompileStatusChanged;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const RenderSnapshotPublishedEvent&)
+{
+	return RuntimeEventType::RenderSnapshotPublished;
+}
+
+inline RuntimeEventType RuntimeEventPayloadType(const RenderResetEvent& event)
+{
+	return event.applied ? RuntimeEventType::RenderResetApplied : RuntimeEventType::RenderResetRequested;
+}
+
+inline RuntimeEventType RuntimeEventPayloadType(const OscOverlayEvent& event)
+{
+	return event.settled ? RuntimeEventType::OscOverlaySettled : RuntimeEventType::OscOverlayApplied;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const FrameRenderedEvent&)
+{
+	return RuntimeEventType::FrameRendered;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const PreviewFrameAvailableEvent&)
+{
+	return RuntimeEventType::PreviewFrameAvailable;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const InputSignalChangedEvent&)
+{
+	return RuntimeEventType::InputSignalChanged;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const InputFrameArrivedEvent&)
+{
+	return RuntimeEventType::InputFrameArrived;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const OutputFrameScheduledEvent&)
+{
+	return RuntimeEventType::OutputFrameScheduled;
+}
+
+inline RuntimeEventType RuntimeEventPayloadType(const OutputFrameCompletedEvent& event)
+{
+	if (event.result == "DisplayedLate")
+		return RuntimeEventType::OutputLateFrameDetected;
+	if (event.result == "Dropped")
+		return RuntimeEventType::OutputDroppedFrameDetected;
+	return RuntimeEventType::OutputFrameCompleted;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const BackendStateChangedEvent&)
+{
+	return RuntimeEventType::BackendStateChanged;
+}
+
+inline RuntimeEventType RuntimeEventPayloadType(const SubsystemWarningEvent& event)
+{
+	return event.cleared ? RuntimeEventType::SubsystemWarningCleared : RuntimeEventType::SubsystemWarningRaised;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const SubsystemRecoveredEvent&)
+{
+	return RuntimeEventType::SubsystemRecovered;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const TimingSampleRecordedEvent&)
+{
+	return RuntimeEventType::TimingSampleRecorded;
+}
+
+constexpr RuntimeEventType RuntimeEventPayloadType(const QueueDepthChangedEvent&)
+{
+	return RuntimeEventType::QueueDepthChanged;
+}

apps/LoopThroughWithOpenGLCompositing/runtime/events/RuntimeEventQueue.h

@@ -0,0 +1,100 @@
+#pragma once
+
+#include "RuntimeEvent.h"
+
+#include <chrono>
+#include <cstddef>
+#include <deque>
+#include <mutex>
+#include <vector>
+
+struct RuntimeEventQueueMetrics
+{
+	std::size_t depth = 0;
+	std::size_t capacity = 0;
+	std::size_t droppedCount = 0;
+	std::size_t coalescedCount = 0;
+	double oldestEventAgeMilliseconds = 0.0;
+};
+
+class RuntimeEventQueue
+{
+public:
+	explicit RuntimeEventQueue(std::size_t capacity = 1024) :
+		mCapacity(capacity)
+	{
+	}
+
+	bool Push(RuntimeEvent event)
+	{
+		std::lock_guard<std::mutex> lock(mMutex);
+		if (mEvents.size() >= mCapacity)
+		{
+			++mDroppedCount;
+			return false;
+		}
+
+		mEvents.push_back(std::move(event));
+		return true;
+	}
+
+	bool TryPop(RuntimeEvent& event)
+	{
+		std::lock_guard<std::mutex> lock(mMutex);
+		if (mEvents.empty())
+			return false;
+
+		event = std::move(mEvents.front());
+		mEvents.pop_front();
+		return true;
+	}
+
+	std::vector<RuntimeEvent> Drain(std::size_t maxEvents = 0)
+	{
+		std::vector<RuntimeEvent> events;
+
+		std::lock_guard<std::mutex> lock(mMutex);
+		const std::size_t count = maxEvents == 0 || maxEvents > mEvents.size() ? mEvents.size() : maxEvents;
+		events.reserve(count);
+		for (std::size_t index = 0; index < count; ++index)
+		{
+			events.push_back(std::move(mEvents.front()));
+			mEvents.pop_front();
+		}
+
+		return events;
+	}
+
+	RuntimeEventQueueMetrics GetMetrics(std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now()) const
+	{
+		std::lock_guard<std::mutex> lock(mMutex);
+
+		RuntimeEventQueueMetrics metrics;
+		metrics.depth = mEvents.size();
+		metrics.capacity = mCapacity;
+		metrics.droppedCount = mDroppedCount;
+		if (!mEvents.empty())
+		{
+			const auto age = now - mEvents.front().createdAt;
+			metrics.oldestEventAgeMilliseconds = std::chrono::duration<double, std::milli>(age).count();
+		}
+		return metrics;
+	}
+
+	std::size_t Depth() const
+	{
+		std::lock_guard<std::mutex> lock(mMutex);
+		return mEvents.size();
+	}
+
+	std::size_t Capacity() const
+	{
+		return mCapacity;
+	}
+
+private:
+	mutable std::mutex mMutex;
+	std::deque<RuntimeEvent> mEvents;
+	std::size_t mCapacity = 0;
+	std::size_t mDroppedCount = 0;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/events/RuntimeEventType.h

@@ -0,0 +1,151 @@
+#pragma once
+
+#include <string_view>
+
+enum class RuntimeEventType
+{
+	Unknown = 0,
+
+	// Control ingress.
+	OscValueReceived,
+	OscValueCoalesced,
+	OscCommitRequested,
+	HttpControlMutationRequested,
+	WebSocketClientConnected,
+	RuntimeStateBroadcastRequested,
+	FileChangeDetected,
+	ManualReloadRequested,
+
+	// Runtime policy and state.
+	RuntimeMutationAccepted,
+	RuntimeMutationRejected,
+	RuntimeStateChanged,
+	RuntimePersistenceRequested,
+	RuntimeReloadRequested,
+	ShaderPackagesChanged,
+	RenderSnapshotPublishRequested,
+	RuntimeStatePresentationChanged,
+
+	// Shader build lifecycle.
+	ShaderBuildRequested,
+	ShaderBuildPrepared,
+	ShaderBuildApplied,
+	ShaderBuildFailed,
+	CompileStatusChanged,
+
+	// Render lifecycle.
+	RenderSnapshotPublished,
+	RenderResetRequested,
+	RenderResetApplied,
+	OscOverlayApplied,
+	OscOverlaySettled,
+	FrameRendered,
+	PreviewFrameAvailable,
+
+	// Video backend lifecycle.
+	InputSignalChanged,
+	InputFrameArrived,
+	OutputFrameScheduled,
+	OutputFrameCompleted,
+	OutputLateFrameDetected,
+	OutputDroppedFrameDetected,
+	BackendStateChanged,
+
+	// Health and telemetry.
+	SubsystemWarningRaised,
+	SubsystemWarningCleared,
+	SubsystemRecovered,
+	TimingSampleRecorded,
+	QueueDepthChanged
+};
+
+constexpr std::string_view RuntimeEventTypeName(RuntimeEventType type)
+{
+	switch (type)
+	{
+	case RuntimeEventType::Unknown:
+		return "Unknown";
+	case RuntimeEventType::OscValueReceived:
+		return "OscValueReceived";
+	case RuntimeEventType::OscValueCoalesced:
+		return "OscValueCoalesced";
+	case RuntimeEventType::OscCommitRequested:
+		return "OscCommitRequested";
+	case RuntimeEventType::HttpControlMutationRequested:
+		return "HttpControlMutationRequested";
+	case RuntimeEventType::WebSocketClientConnected:
+		return "WebSocketClientConnected";
+	case RuntimeEventType::RuntimeStateBroadcastRequested:
+		return "RuntimeStateBroadcastRequested";
+	case RuntimeEventType::FileChangeDetected:
+		return "FileChangeDetected";
+	case RuntimeEventType::ManualReloadRequested:
+		return "ManualReloadRequested";
+	case RuntimeEventType::RuntimeMutationAccepted:
+		return "RuntimeMutationAccepted";
+	case RuntimeEventType::RuntimeMutationRejected:
+		return "RuntimeMutationRejected";
+	case RuntimeEventType::RuntimeStateChanged:
+		return "RuntimeStateChanged";
+	case RuntimeEventType::RuntimePersistenceRequested:
+		return "RuntimePersistenceRequested";
+	case RuntimeEventType::RuntimeReloadRequested:
+		return "RuntimeReloadRequested";
+	case RuntimeEventType::ShaderPackagesChanged:
+		return "ShaderPackagesChanged";
+	case RuntimeEventType::RenderSnapshotPublishRequested:
+		return "RenderSnapshotPublishRequested";
+	case RuntimeEventType::RuntimeStatePresentationChanged:
+		return "RuntimeStatePresentationChanged";
+	case RuntimeEventType::ShaderBuildRequested:
+		return "ShaderBuildRequested";
+	case RuntimeEventType::ShaderBuildPrepared:
+		return "ShaderBuildPrepared";
+	case RuntimeEventType::ShaderBuildApplied:
+		return "ShaderBuildApplied";
+	case RuntimeEventType::ShaderBuildFailed:
+		return "ShaderBuildFailed";
+	case RuntimeEventType::CompileStatusChanged:
+		return "CompileStatusChanged";
+	case RuntimeEventType::RenderSnapshotPublished:
+		return "RenderSnapshotPublished";
+	case RuntimeEventType::RenderResetRequested:
+		return "RenderResetRequested";
+	case RuntimeEventType::RenderResetApplied:
+		return "RenderResetApplied";
+	case RuntimeEventType::OscOverlayApplied:
+		return "OscOverlayApplied";
+	case RuntimeEventType::OscOverlaySettled:
+		return "OscOverlaySettled";
+	case RuntimeEventType::FrameRendered:
+		return "FrameRendered";
+	case RuntimeEventType::PreviewFrameAvailable:
+		return "PreviewFrameAvailable";
+	case RuntimeEventType::InputSignalChanged:
+		return "InputSignalChanged";
+	case RuntimeEventType::InputFrameArrived:
+		return "InputFrameArrived";
+	case RuntimeEventType::OutputFrameScheduled:
+		return "OutputFrameScheduled";
+	case RuntimeEventType::OutputFrameCompleted:
+		return "OutputFrameCompleted";
+	case RuntimeEventType::OutputLateFrameDetected:
+		return "OutputLateFrameDetected";
+	case RuntimeEventType::OutputDroppedFrameDetected:
+		return "OutputDroppedFrameDetected";
+	case RuntimeEventType::BackendStateChanged:
+		return "BackendStateChanged";
+	case RuntimeEventType::SubsystemWarningRaised:
+		return "SubsystemWarningRaised";
+	case RuntimeEventType::SubsystemWarningCleared:
+		return "SubsystemWarningCleared";
+	case RuntimeEventType::SubsystemRecovered:
+		return "SubsystemRecovered";
+	case RuntimeEventType::TimingSampleRecorded:
+		return "TimingSampleRecorded";
+	case RuntimeEventType::QueueDepthChanged:
+		return "QueueDepthChanged";
+	}
+
+	return "Unknown";
+}

apps/LoopThroughWithOpenGLCompositing/runtime/live/CommittedLiveState.cpp

@@ -0,0 +1,144 @@
+#include "CommittedLiveState.h"
+
+bool CommittedLiveState::LoadPersistentStateValue(const JsonValue& root)
+{
+	return mLayerStack.LoadPersistentStateValue(root);
+}
+
+JsonValue CommittedLiveState::BuildPersistentStateValue(const ShaderPackageCatalog& shaderCatalog) const
+{
+	return mLayerStack.BuildPersistentStateValue(shaderCatalog);
+}
+
+void CommittedLiveState::NormalizeLayerIds()
+{
+	mLayerStack.NormalizeLayerIds();
+}
+
+void CommittedLiveState::EnsureDefaultsForAllLayers(const ShaderPackageCatalog& shaderCatalog)
+{
+	mLayerStack.EnsureDefaultsForAllLayers(shaderCatalog);
+}
+
+void CommittedLiveState::EnsureDefaultLayer(const ShaderPackageCatalog& shaderCatalog)
+{
+	mLayerStack.EnsureDefaultLayer(shaderCatalog);
+}
+
+void CommittedLiveState::RemoveLayersWithMissingPackages(const ShaderPackageCatalog& shaderCatalog)
+{
+	mLayerStack.RemoveLayersWithMissingPackages(shaderCatalog);
+}
+
+bool CommittedLiveState::CreateLayer(const ShaderPackageCatalog& shaderCatalog, const std::string& shaderId, std::string& error)
+{
+	return mLayerStack.CreateLayer(shaderCatalog, shaderId, error);
+}
+
+bool CommittedLiveState::DeleteLayer(const std::string& layerId, std::string& error)
+{
+	return mLayerStack.DeleteLayer(layerId, error);
+}
+
+bool CommittedLiveState::MoveLayer(const std::string& layerId, int direction, std::string& error)
+{
+	return mLayerStack.MoveLayer(layerId, direction, error);
+}
+
+bool CommittedLiveState::MoveLayerToIndex(const std::string& layerId, std::size_t targetIndex, std::string& error)
+{
+	return mLayerStack.MoveLayerToIndex(layerId, targetIndex, error);
+}
+
+bool CommittedLiveState::SetLayerBypassState(const std::string& layerId, bool bypassed, std::string& error)
+{
+	return mLayerStack.SetLayerBypassState(layerId, bypassed, error);
+}
+
+bool CommittedLiveState::SetLayerShaderSelection(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, const std::string& shaderId, std::string& error)
+{
+	return mLayerStack.SetLayerShaderSelection(shaderCatalog, layerId, shaderId, error);
+}
+
+bool CommittedLiveState::SetParameterValue(const std::string& layerId, const std::string& parameterId, const ShaderParameterValue& value, std::string& error)
+{
+	return mLayerStack.SetParameterValue(layerId, parameterId, value, error);
+}
+
+bool CommittedLiveState::ResetLayerParameterValues(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, std::string& error)
+{
+	return mLayerStack.ResetLayerParameterValues(shaderCatalog, layerId, error);
+}
+
+bool CommittedLiveState::HasLayer(const std::string& layerId) const
+{
+	return mLayerStack.HasLayer(layerId);
+}
+
+bool CommittedLiveState::TryGetParameterById(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, const std::string& parameterId, StoredParameterSnapshot& snapshot, std::string& error) const
+{
+	return mLayerStack.TryGetParameterById(shaderCatalog, layerId, parameterId, snapshot, error);
+}
+
+bool CommittedLiveState::TryGetParameterByControlKey(const ShaderPackageCatalog& shaderCatalog, const std::string& layerKey, const std::string& parameterKey, StoredParameterSnapshot& snapshot, std::string& error) const
+{
+	return mLayerStack.TryGetParameterByControlKey(shaderCatalog, layerKey, parameterKey, snapshot, error);
+}
+
+bool CommittedLiveState::ResolveLayerMove(const std::string& layerId, int direction, bool& shouldMove, std::string& error) const
+{
+	return mLayerStack.ResolveLayerMove(layerId, direction, shouldMove, error);
+}
+
+bool CommittedLiveState::ResolveLayerMoveToIndex(const std::string& layerId, std::size_t targetIndex, bool& shouldMove, std::string& error) const
+{
+	return mLayerStack.ResolveLayerMoveToIndex(layerId, targetIndex, shouldMove, error);
+}
+
+JsonValue CommittedLiveState::BuildStackPresetValue(const ShaderPackageCatalog& shaderCatalog, const std::string& presetName) const
+{
+	return mLayerStack.BuildStackPresetValue(shaderCatalog, presetName);
+}
+
+bool CommittedLiveState::LoadStackPresetValue(const ShaderPackageCatalog& shaderCatalog, const JsonValue& root, std::string& error)
+{
+	return mLayerStack.LoadStackPresetValue(shaderCatalog, root, error);
+}
+
+CommittedLiveStateReadModel CommittedLiveState::BuildReadModel(const ShaderPackageCatalog& shaderCatalog) const
+{
+	CommittedLiveStateReadModel model;
+	model.layers = mLayerStack.Layers();
+	model.packagesById = shaderCatalog.CaptureSnapshot().packagesById;
+	return model;
+}
+
+std::vector<CommittedLiveState::LayerPersistentState> CommittedLiveState::CopyLayerStates() const
+{
+	return mLayerStack.Layers();
+}
+
+const std::vector<CommittedLiveState::LayerPersistentState>& CommittedLiveState::Layers() const
+{
+	return mLayerStack.Layers();
+}
+
+std::vector<CommittedLiveState::LayerPersistentState>& CommittedLiveState::Layers()
+{
+	return mLayerStack.Layers();
+}
+
+const CommittedLiveState::LayerPersistentState* CommittedLiveState::FindLayerById(const std::string& layerId) const
+{
+	return mLayerStack.FindLayerById(layerId);
+}
+
+const LayerStackStore& CommittedLiveState::LayerStack() const
+{
+	return mLayerStack;
+}
+
+LayerStackStore& CommittedLiveState::LayerStack()
+{
+	return mLayerStack;
+}

apps/LoopThroughWithOpenGLCompositing/runtime/live/CommittedLiveState.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include "LayerStackStore.h"
+#include "RuntimeStoreReadModels.h"
+#include "ShaderPackageCatalog.h"
+
+#include <cstddef>
+#include <string>
+#include <vector>
+
+class CommittedLiveState
+{
+public:
+	using LayerPersistentState = LayerStackStore::LayerPersistentState;
+	using StoredParameterSnapshot = LayerStackStore::StoredParameterSnapshot;
+
+	bool LoadPersistentStateValue(const JsonValue& root);
+	JsonValue BuildPersistentStateValue(const ShaderPackageCatalog& shaderCatalog) const;
+	void NormalizeLayerIds();
+	void EnsureDefaultsForAllLayers(const ShaderPackageCatalog& shaderCatalog);
+	void EnsureDefaultLayer(const ShaderPackageCatalog& shaderCatalog);
+	void RemoveLayersWithMissingPackages(const ShaderPackageCatalog& shaderCatalog);
+
+	bool CreateLayer(const ShaderPackageCatalog& shaderCatalog, const std::string& shaderId, std::string& error);
+	bool DeleteLayer(const std::string& layerId, std::string& error);
+	bool MoveLayer(const std::string& layerId, int direction, std::string& error);
+	bool MoveLayerToIndex(const std::string& layerId, std::size_t targetIndex, std::string& error);
+	bool SetLayerBypassState(const std::string& layerId, bool bypassed, std::string& error);
+	bool SetLayerShaderSelection(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, const std::string& shaderId, std::string& error);
+	bool SetParameterValue(const std::string& layerId, const std::string& parameterId, const ShaderParameterValue& value, std::string& error);
+	bool ResetLayerParameterValues(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, std::string& error);
+
+	bool HasLayer(const std::string& layerId) const;
+	bool TryGetParameterById(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, const std::string& parameterId, StoredParameterSnapshot& snapshot, std::string& error) const;
+	bool TryGetParameterByControlKey(const ShaderPackageCatalog& shaderCatalog, const std::string& layerKey, const std::string& parameterKey, StoredParameterSnapshot& snapshot, std::string& error) const;
+	bool ResolveLayerMove(const std::string& layerId, int direction, bool& shouldMove, std::string& error) const;
+	bool ResolveLayerMoveToIndex(const std::string& layerId, std::size_t targetIndex, bool& shouldMove, std::string& error) const;
+
+	JsonValue BuildStackPresetValue(const ShaderPackageCatalog& shaderCatalog, const std::string& presetName) const;
+	bool LoadStackPresetValue(const ShaderPackageCatalog& shaderCatalog, const JsonValue& root, std::string& error);
+
+	CommittedLiveStateReadModel BuildReadModel(const ShaderPackageCatalog& shaderCatalog) const;
+	std::vector<LayerPersistentState> CopyLayerStates() const;
+	const std::vector<LayerPersistentState>& Layers() const;
+	std::vector<LayerPersistentState>& Layers();
+	const LayerPersistentState* FindLayerById(const std::string& layerId) const;
+	const LayerStackStore& LayerStack() const;
+	LayerStackStore& LayerStack();
+
+private:
+	LayerStackStore mLayerStack;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/live/RenderStateComposer.cpp

@@ -0,0 +1,26 @@
+#include "RenderStateComposer.h"
+
+RenderStateCompositionResult RenderStateComposer::BuildFrameState(const LayeredRenderStateInput& input) const
+{
+	RenderStateCompositionResult result;
+	const std::vector<RuntimeRenderState>* layerStates =
+		input.committedLiveLayerStates ? input.committedLiveLayerStates : input.basePersistedLayerStates;
+	if (!layerStates)
+		return result;
+
+	result.layerStates = *layerStates;
+	result.hasLayerStates = !result.layerStates.empty();
+	if (input.transientAutomationOverlay)
+	{
+		RuntimeLiveStateApplyOptions options;
+		options.allowCommit = input.allowTransientAutomationCommits;
+		options.smoothing = input.transientAutomationSmoothing;
+		options.commitDelay = input.transientAutomationCommitDelay;
+		options.now = input.now;
+		input.transientAutomationOverlay->ApplyToLayerStates(
+			result.layerStates,
+			options,
+			input.collectTransientAutomationCommitRequests ? &result.commitRequests : nullptr);
+	}
+	return result;
+}

apps/LoopThroughWithOpenGLCompositing/runtime/live/RenderStateComposer.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include "RuntimeLiveState.h"
+
+#include <chrono>
+#include <vector>
+
+struct LayeredRenderStateInput
+{
+	const std::vector<RuntimeRenderState>* basePersistedLayerStates = nullptr;
+	const std::vector<RuntimeRenderState>* committedLiveLayerStates = nullptr;
+	RuntimeLiveState* transientAutomationOverlay = nullptr;
+	bool allowTransientAutomationCommits = false;
+	bool collectTransientAutomationCommitRequests = true;
+	double transientAutomationSmoothing = 0.0;
+	std::chrono::milliseconds transientAutomationCommitDelay = std::chrono::milliseconds(150);
+	std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now();
+};
+
+struct RenderStateCompositionResult
+{
+	std::vector<RuntimeRenderState> layerStates;
+	std::vector<RuntimeLiveOscCommitRequest> commitRequests;
+	bool hasLayerStates = false;
+};
+
+class RenderStateComposer
+{
+public:
+	RenderStateCompositionResult BuildFrameState(const LayeredRenderStateInput& input) const;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/live/RuntimeLiveState.cpp

@@ -0,0 +1,329 @@
+#include "RuntimeLiveState.h"
+
+#include "RuntimeParameterUtils.h"
+
+#include <algorithm>
+#include <cctype>
+#include <cmath>
+#include <cstddef>
+
+namespace
+{
+constexpr double kOscSmoothingReferenceFps = 60.0;
+constexpr double kOscSmoothingMaxStepSeconds = 0.25;
+
+std::string SimplifyOscControlKey(const std::string& text)
+{
+	std::string simplified;
+	for (unsigned char ch : text)
+	{
+		if (std::isalnum(ch))
+			simplified.push_back(static_cast<char>(std::tolower(ch)));
+	}
+	return simplified;
+}
+
+bool MatchesOscControlKey(const std::string& candidate, const std::string& key)
+{
+	return candidate == key || SimplifyOscControlKey(candidate) == SimplifyOscControlKey(key);
+}
+
+double ClampOscAlpha(double value)
+{
+	return (std::max)(0.0, (std::min)(1.0, value));
+}
+
+double ComputeTimeBasedOscAlpha(double smoothing, double deltaSeconds)
+{
+	const double clampedSmoothing = ClampOscAlpha(smoothing);
+	if (clampedSmoothing <= 0.0)
+		return 0.0;
+	if (clampedSmoothing >= 1.0)
+		return 1.0;
+
+	const double clampedDeltaSeconds = (std::max)(0.0, (std::min)(kOscSmoothingMaxStepSeconds, deltaSeconds));
+	if (clampedDeltaSeconds <= 0.0)
+		return 0.0;
+
+	const double frameScale = clampedDeltaSeconds * kOscSmoothingReferenceFps;
+	return ClampOscAlpha(1.0 - std::pow(1.0 - clampedSmoothing, frameScale));
+}
+
+JsonValue BuildOscCommitValue(const ShaderParameterDefinition& definition, const ShaderParameterValue& value)
+{
+	switch (definition.type)
+	{
+	case ShaderParameterType::Boolean:
+		return JsonValue(value.booleanValue);
+	case ShaderParameterType::Enum:
+		return JsonValue(value.enumValue);
+	case ShaderParameterType::Text:
+		return JsonValue(value.textValue);
+	case ShaderParameterType::Trigger:
+	case ShaderParameterType::Float:
+		return JsonValue(value.numberValues.empty() ? 0.0 : value.numberValues.front());
+	case ShaderParameterType::Vec2:
+	case ShaderParameterType::Color:
+	{
+		JsonValue array = JsonValue::MakeArray();
+		for (double number : value.numberValues)
+			array.pushBack(JsonValue(number));
+		return array;
+	}
+	}
+
+	return JsonValue();
+}
+
+}
+
+void RuntimeLiveState::Clear()
+{
+	mOscOverlayStates.clear();
+}
+
+void RuntimeLiveState::ClearForLayerKey(const std::string& layerKey)
+{
+	for (auto it = mOscOverlayStates.begin(); it != mOscOverlayStates.end();)
+	{
+		if (OverlayMatchesLayerKey(it->second, layerKey))
+			it = mOscOverlayStates.erase(it);
+		else
+			++it;
+	}
+}
+
+bool RuntimeLiveState::OverlayMatchesLayerKey(const OscOverlayState& overlay, const std::string& layerKey)
+{
+	return MatchesOscControlKey(overlay.layerKey, layerKey);
+}
+
+bool RuntimeLiveState::TryResolveOverlayTarget(
+	const OscOverlayState& overlay,
+	const std::vector<RuntimeRenderState>& states,
+	std::vector<RuntimeRenderState>::const_iterator& stateIt,
+	std::vector<ShaderParameterDefinition>::const_iterator& definitionIt)
+{
+	stateIt = std::find_if(states.begin(), states.end(),
+		[&overlay](const RuntimeRenderState& state)
+		{
+			return MatchesOscControlKey(state.layerId, overlay.layerKey) ||
+				MatchesOscControlKey(state.shaderId, overlay.layerKey) ||
+				MatchesOscControlKey(state.shaderName, overlay.layerKey);
+		});
+	if (stateIt == states.end())
+		return false;
+
+	definitionIt = std::find_if(stateIt->parameterDefinitions.begin(), stateIt->parameterDefinitions.end(),
+		[&overlay](const ShaderParameterDefinition& definition)
+		{
+			return MatchesOscControlKey(definition.id, overlay.parameterKey) ||
+				MatchesOscControlKey(definition.label, overlay.parameterKey);
+		});
+	return definitionIt != stateIt->parameterDefinitions.end();
+}
+
+std::size_t RuntimeLiveState::OverlayCount() const
+{
+	return mOscOverlayStates.size();
+}
+
+void RuntimeLiveState::ApplyOscUpdates(const std::vector<RuntimeLiveOscUpdate>& updates)
+{
+	const auto now = std::chrono::steady_clock::now();
+	for (const RuntimeLiveOscUpdate& update : updates)
+	{
+		auto overlayIt = mOscOverlayStates.find(update.routeKey);
+		if (overlayIt == mOscOverlayStates.end())
+		{
+			OscOverlayState overlay;
+			overlay.layerKey = update.layerKey;
+			overlay.parameterKey = update.parameterKey;
+			overlay.targetValue = update.targetValue;
+			overlay.lastUpdatedTime = now;
+			overlay.lastAppliedTime = now;
+			overlay.generation = 1;
+			mOscOverlayStates[update.routeKey] = std::move(overlay);
+		}
+		else
+		{
+			overlayIt->second.targetValue = update.targetValue;
+			overlayIt->second.lastUpdatedTime = now;
+			overlayIt->second.generation += 1;
+			overlayIt->second.commitQueued = false;
+		}
+	}
+}
+
+void RuntimeLiveState::ApplyOscCommitCompletions(const std::vector<RuntimeLiveOscCommitCompletion>& completedCommits)
+{
+	for (const RuntimeLiveOscCommitCompletion& completedCommit : completedCommits)
+	{
+		auto overlayIt = mOscOverlayStates.find(completedCommit.routeKey);
+		if (overlayIt == mOscOverlayStates.end())
+			continue;
+
+		OscOverlayState& overlay = overlayIt->second;
+		if (overlay.commitQueued &&
+			overlay.pendingCommitGeneration == completedCommit.generation &&
+			overlay.generation == completedCommit.generation)
+		{
+			mOscOverlayStates.erase(overlayIt);
+		}
+	}
+}
+
+void RuntimeLiveState::PruneIncompatibleOverlays(const std::vector<RuntimeRenderState>& states)
+{
+	for (auto it = mOscOverlayStates.begin(); it != mOscOverlayStates.end();)
+	{
+		std::vector<RuntimeRenderState>::const_iterator stateIt;
+		std::vector<ShaderParameterDefinition>::const_iterator definitionIt;
+		if (TryResolveOverlayTarget(it->second, states, stateIt, definitionIt))
+		{
+			ShaderParameterValue targetValue;
+			std::string normalizeError;
+			if (NormalizeAndValidateParameterValue(*definitionIt, it->second.targetValue, targetValue, normalizeError))
+			{
+				++it;
+				continue;
+			}
+		}
+
+		it = mOscOverlayStates.erase(it);
+	}
+}
+
+void RuntimeLiveState::ApplyToLayerStates(
+	std::vector<RuntimeRenderState>& states,
+	const RuntimeLiveStateApplyOptions& options,
+	std::vector<RuntimeLiveOscCommitRequest>* commitRequests)
+{
+	if (states.empty() || mOscOverlayStates.empty())
+		return;
+
+	PruneIncompatibleOverlays(states);
+	if (mOscOverlayStates.empty())
+		return;
+
+	const auto now = options.now;
+	const double clampedSmoothing = ClampOscAlpha(options.smoothing);
+	std::vector<std::string> overlayKeysToRemove;
+
+	for (auto& item : mOscOverlayStates)
+	{
+		const std::string& routeKey = item.first;
+		OscOverlayState& overlay = item.second;
+		auto stateIt = std::find_if(states.begin(), states.end(),
+			[&overlay](const RuntimeRenderState& state)
+			{
+				return MatchesOscControlKey(state.layerId, overlay.layerKey) ||
+					MatchesOscControlKey(state.shaderId, overlay.layerKey) ||
+					MatchesOscControlKey(state.shaderName, overlay.layerKey);
+			});
+		if (stateIt == states.end())
+			continue;
+
+		auto definitionIt = std::find_if(stateIt->parameterDefinitions.begin(), stateIt->parameterDefinitions.end(),
+			[&overlay](const ShaderParameterDefinition& definition)
+			{
+				return MatchesOscControlKey(definition.id, overlay.parameterKey) ||
+					MatchesOscControlKey(definition.label, overlay.parameterKey);
+			});
+		if (definitionIt == stateIt->parameterDefinitions.end())
+			continue;
+
+		ShaderParameterValue targetValue;
+		std::string normalizeError;
+		if (!NormalizeAndValidateParameterValue(*definitionIt, overlay.targetValue, targetValue, normalizeError))
+			continue;
+
+		if (definitionIt->type == ShaderParameterType::Trigger)
+		{
+			ShaderParameterValue& value = stateIt->parameterValues[definitionIt->id];
+			const double previousCount = value.numberValues.empty() ? 0.0 : value.numberValues[0];
+			const double triggerTime = stateIt->timeSeconds;
+			value.numberValues = { previousCount + 1.0, triggerTime };
+			overlayKeysToRemove.push_back(routeKey);
+			continue;
+		}
+
+		const bool smoothable =
+			clampedSmoothing > 0.0 &&
+			(definitionIt->type == ShaderParameterType::Float ||
+				definitionIt->type == ShaderParameterType::Vec2 ||
+				definitionIt->type == ShaderParameterType::Color);
+		if (!smoothable)
+		{
+			overlay.currentValue = targetValue;
+			overlay.hasCurrentValue = true;
+			stateIt->parameterValues[definitionIt->id] = overlay.currentValue;
+			if (options.allowCommit &&
+				!overlay.commitQueued &&
+				now - overlay.lastUpdatedTime >= options.commitDelay &&
+				commitRequests)
+			{
+				commitRequests->push_back({ routeKey, overlay.layerKey, overlay.parameterKey, overlay.targetValue, overlay.generation });
+				overlay.pendingCommitGeneration = overlay.generation;
+				overlay.commitQueued = true;
+			}
+			continue;
+		}
+
+		if (!overlay.hasCurrentValue)
+		{
+			overlay.currentValue = DefaultValueForDefinition(*definitionIt);
+			auto currentIt = stateIt->parameterValues.find(definitionIt->id);
+			if (currentIt != stateIt->parameterValues.end())
+				overlay.currentValue = currentIt->second;
+			overlay.hasCurrentValue = true;
+		}
+
+		if (overlay.currentValue.numberValues.size() != targetValue.numberValues.size())
+			overlay.currentValue.numberValues = targetValue.numberValues;
+
+		double smoothingAlpha = clampedSmoothing;
+		if (overlay.lastAppliedTime != std::chrono::steady_clock::time_point())
+		{
+			const double deltaSeconds =
+				std::chrono::duration_cast<std::chrono::duration<double>>(now - overlay.lastAppliedTime).count();
+			smoothingAlpha = ComputeTimeBasedOscAlpha(clampedSmoothing, deltaSeconds);
+		}
+		overlay.lastAppliedTime = now;
+
+		ShaderParameterValue nextValue = targetValue;
+		bool converged = true;
+		for (std::size_t index = 0; index < targetValue.numberValues.size(); ++index)
+		{
+			const double currentNumber = overlay.currentValue.numberValues[index];
+			const double targetNumber = targetValue.numberValues[index];
+			const double delta = targetNumber - currentNumber;
+			double nextNumber = currentNumber + delta * smoothingAlpha;
+			if (std::fabs(delta) <= 0.0005)
+				nextNumber = targetNumber;
+			else
+				converged = false;
+			nextValue.numberValues[index] = nextNumber;
+		}
+
+		if (converged)
+			nextValue.numberValues = targetValue.numberValues;
+
+		overlay.currentValue = nextValue;
+		overlay.hasCurrentValue = true;
+		stateIt->parameterValues[definitionIt->id] = overlay.currentValue;
+		if (options.allowCommit &&
+			converged &&
+			!overlay.commitQueued &&
+			now - overlay.lastUpdatedTime >= options.commitDelay &&
+			commitRequests)
+		{
+			commitRequests->push_back({ routeKey, overlay.layerKey, overlay.parameterKey, BuildOscCommitValue(*definitionIt, overlay.currentValue), overlay.generation });
+			overlay.pendingCommitGeneration = overlay.generation;
+			overlay.commitQueued = true;
+		}
+	}
+
+	for (const std::string& overlayKey : overlayKeysToRemove)
+		mOscOverlayStates.erase(overlayKey);
+}

apps/LoopThroughWithOpenGLCompositing/runtime/live/RuntimeLiveState.h

@@ -0,0 +1,80 @@
+#pragma once
+
+#include "RuntimeJson.h"
+#include "ShaderTypes.h"
+
+#include <chrono>
+#include <cstdint>
+#include <map>
+#include <string>
+#include <vector>
+
+struct RuntimeLiveOscUpdate
+{
+	std::string routeKey;
+	std::string layerKey;
+	std::string parameterKey;
+	JsonValue targetValue;
+};
+
+struct RuntimeLiveOscCommitCompletion
+{
+	std::string routeKey;
+	uint64_t generation = 0;
+};
+
+struct RuntimeLiveOscCommitRequest
+{
+	std::string routeKey;
+	std::string layerKey;
+	std::string parameterKey;
+	JsonValue value;
+	uint64_t generation = 0;
+};
+
+struct RuntimeLiveStateApplyOptions
+{
+	bool allowCommit = false;
+	double smoothing = 0.0;
+	std::chrono::milliseconds commitDelay = std::chrono::milliseconds(150);
+	std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now();
+};
+
+class RuntimeLiveState
+{
+public:
+	void Clear();
+	void ClearForLayerKey(const std::string& layerKey);
+	std::size_t OverlayCount() const;
+	void ApplyOscUpdates(const std::vector<RuntimeLiveOscUpdate>& updates);
+	void ApplyOscCommitCompletions(const std::vector<RuntimeLiveOscCommitCompletion>& completedCommits);
+	void PruneIncompatibleOverlays(const std::vector<RuntimeRenderState>& states);
+	void ApplyToLayerStates(
+		std::vector<RuntimeRenderState>& states,
+		const RuntimeLiveStateApplyOptions& options,
+		std::vector<RuntimeLiveOscCommitRequest>* commitRequests);
+
+private:
+	struct OscOverlayState
+	{
+		std::string layerKey;
+		std::string parameterKey;
+		JsonValue targetValue;
+		ShaderParameterValue currentValue;
+		bool hasCurrentValue = false;
+		std::chrono::steady_clock::time_point lastUpdatedTime;
+		std::chrono::steady_clock::time_point lastAppliedTime;
+		uint64_t generation = 0;
+		uint64_t pendingCommitGeneration = 0;
+		bool commitQueued = false;
+	};
+
+	static bool OverlayMatchesLayerKey(const OscOverlayState& overlay, const std::string& layerKey);
+	static bool TryResolveOverlayTarget(
+		const OscOverlayState& overlay,
+		const std::vector<RuntimeRenderState>& states,
+		std::vector<RuntimeRenderState>::const_iterator& stateIt,
+		std::vector<ShaderParameterDefinition>::const_iterator& definitionIt);
+
+	std::map<std::string, OscOverlayState> mOscOverlayStates;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/live/RuntimeStateLayerModel.cpp

@@ -0,0 +1,229 @@
+#include "RuntimeStateLayerModel.h"
+
+const char* RuntimeStateLayerKindName(RuntimeStateLayerKind kind)
+{
+	switch (kind)
+	{
+	case RuntimeStateLayerKind::BasePersisted:
+		return "base persisted";
+	case RuntimeStateLayerKind::CommittedLive:
+		return "committed live";
+	case RuntimeStateLayerKind::TransientAutomation:
+		return "transient automation";
+	case RuntimeStateLayerKind::RenderLocal:
+		return "render local";
+	case RuntimeStateLayerKind::HealthConfig:
+		return "health/config";
+	default:
+		return "unknown";
+	}
+}
+
+int RuntimeStateLayerCompositionPrecedence(RuntimeStateLayerKind kind)
+{
+	switch (kind)
+	{
+	case RuntimeStateLayerKind::BasePersisted:
+		return 0;
+	case RuntimeStateLayerKind::CommittedLive:
+		return 1;
+	case RuntimeStateLayerKind::TransientAutomation:
+		return 2;
+	case RuntimeStateLayerKind::RenderLocal:
+	case RuntimeStateLayerKind::HealthConfig:
+	default:
+		return -1;
+	}
+}
+
+bool RuntimeStateLayerIsDurable(RuntimeStateLayerKind kind)
+{
+	return kind == RuntimeStateLayerKind::BasePersisted;
+}
+
+bool RuntimeStateLayerParticipatesInParameterComposition(RuntimeStateLayerKind kind)
+{
+	return RuntimeStateLayerCompositionPrecedence(kind) >= 0;
+}
+
+bool RuntimeStateLayerIsRenderLocal(RuntimeStateLayerKind kind)
+{
+	return kind == RuntimeStateLayerKind::RenderLocal;
+}
+
+RuntimeStateLayerKind ClassifyRuntimeStateField(RuntimeStateField field)
+{
+	switch (field)
+	{
+	case RuntimeStateField::PersistedLayerStack:
+	case RuntimeStateField::PersistedParameterValues:
+	case RuntimeStateField::StackPresets:
+		return RuntimeStateLayerKind::BasePersisted;
+	case RuntimeStateField::CommittedSessionParameterValues:
+	case RuntimeStateField::CommittedLayerBypass:
+	case RuntimeStateField::RuntimeCompileReloadFlags:
+		return RuntimeStateLayerKind::CommittedLive;
+	case RuntimeStateField::TransientOscOverlay:
+	case RuntimeStateField::TransientAutomationCommitState:
+		return RuntimeStateLayerKind::TransientAutomation;
+	case RuntimeStateField::RenderLocalTemporalHistory:
+	case RuntimeStateField::RenderLocalFeedbackState:
+	case RuntimeStateField::RenderLocalInputFrames:
+	case RuntimeStateField::RenderLocalOutputFrames:
+		return RuntimeStateLayerKind::RenderLocal;
+	case RuntimeStateField::RuntimeConfiguration:
+	case RuntimeStateField::HealthTelemetry:
+	default:
+		return RuntimeStateLayerKind::HealthConfig;
+	}
+}
+
+std::vector<RuntimeStateLayerDescriptor> GetRuntimeStateLayerInventory()
+{
+	return {
+		{
+			RuntimeStateLayerKind::BasePersisted,
+			"Base persisted state",
+			"RuntimeStore / LayerStackStore",
+			"Survives restart",
+			"Written to disk",
+			"Default layer stack, shader selections, saved parameter values"
+		},
+		{
+			RuntimeStateLayerKind::CommittedLive,
+			"Committed live state",
+			"RuntimeCoordinator / CommittedLiveState",
+			"Current running session",
+			"May request persistence depending on mutation policy",
+			"Operator/session truth until changed again"
+		},
+		{
+			RuntimeStateLayerKind::TransientAutomation,
+			"Transient automation overlay",
+			"RuntimeLiveState / RuntimeServiceLiveBridge",
+			"High-rate and short-lived",
+			"Not persisted directly",
+			"Temporary OSC/automation target applied over committed truth"
+		},
+		{
+			RuntimeStateLayerKind::RenderLocal,
+			"Render-local state",
+			"RenderEngine",
+			"Render-thread/resource lifetime",
+			"Not persisted",
+			"Temporal history, feedback, input/output queues, and GL-local caches"
+		},
+		{
+			RuntimeStateLayerKind::HealthConfig,
+			"Health/config state",
+			"RuntimeConfigStore / HealthTelemetry",
+			"Config survives restart; health is observational",
+			"Config is file-backed; health is reported, not composed",
+			"Does not participate in parameter composition"
+		}
+	};
+}
+
+std::vector<RuntimeStateFieldDescriptor> GetRuntimeStateFieldInventory()
+{
+	return {
+		{
+			RuntimeStateField::PersistedLayerStack,
+			ClassifyRuntimeStateField(RuntimeStateField::PersistedLayerStack),
+			"persisted layer stack",
+			"LayerStackStore",
+			"Durable layer order, ids, shader selections, and bypass flags"
+		},
+		{
+			RuntimeStateField::PersistedParameterValues,
+			ClassifyRuntimeStateField(RuntimeStateField::PersistedParameterValues),
+			"persisted parameter values",
+			"LayerStackStore",
+			"Saved parameter values used as the baseline for snapshots and presets"
+		},
+		{
+			RuntimeStateField::StackPresets,
+			ClassifyRuntimeStateField(RuntimeStateField::StackPresets),
+			"stack presets",
+			"RuntimeStore / LayerStackStore",
+			"Durable preset files and preset serialization shape"
+		},
+		{
+			RuntimeStateField::CommittedSessionParameterValues,
+			ClassifyRuntimeStateField(RuntimeStateField::CommittedSessionParameterValues),
+			"committed session parameter values",
+			"RuntimeCoordinator policy, CommittedLiveState backing",
+			"Operator/API truth after accepted mutations"
+		},
+		{
+			RuntimeStateField::CommittedLayerBypass,
+			ClassifyRuntimeStateField(RuntimeStateField::CommittedLayerBypass),
+			"committed layer bypass",
+			"RuntimeCoordinator policy, CommittedLiveState backing",
+			"Current operator/API bypass state"
+		},
+		{
+			RuntimeStateField::RuntimeCompileReloadFlags,
+			ClassifyRuntimeStateField(RuntimeStateField::RuntimeCompileReloadFlags),
+			"runtime compile/reload flags",
+			"RuntimeCoordinator / RuntimeUpdateController",
+			"Session coordination state used to request snapshot or render rebuild work"
+		},
+		{
+			RuntimeStateField::TransientOscOverlay,
+			ClassifyRuntimeStateField(RuntimeStateField::TransientOscOverlay),
+			"transient OSC overlays",
+			"RuntimeLiveState",
+			"High-rate automation values applied above committed state"
+		},
+		{
+			RuntimeStateField::TransientAutomationCommitState,
+			ClassifyRuntimeStateField(RuntimeStateField::TransientAutomationCommitState),
+			"transient automation commit state",
+			"RuntimeLiveState / RuntimeServiceLiveBridge",
+			"Generation and completion bookkeeping for settled overlay commits"
+		},
+		{
+			RuntimeStateField::RenderLocalTemporalHistory,
+			ClassifyRuntimeStateField(RuntimeStateField::RenderLocalTemporalHistory),
+			"render-local temporal history",
+			"RenderEngine",
+			"GL/resource history that must stay out of parameter layering"
+		},
+		{
+			RuntimeStateField::RenderLocalFeedbackState,
+			ClassifyRuntimeStateField(RuntimeStateField::RenderLocalFeedbackState),
+			"render-local feedback state",
+			"RenderEngine",
+			"Feedback buffers and ping-pong resources"
+		},
+		{
+			RuntimeStateField::RenderLocalInputFrames,
+			ClassifyRuntimeStateField(RuntimeStateField::RenderLocalInputFrames),
+			"render-local input frames",
+			"RenderEngine",
+			"Latest accepted input frame payloads and upload staging"
+		},
+		{
+			RuntimeStateField::RenderLocalOutputFrames,
+			ClassifyRuntimeStateField(RuntimeStateField::RenderLocalOutputFrames),
+			"render-local output frames",
+			"RenderEngine",
+			"Readback, packed output, screenshot, and preview staging"
+		},
+		{
+			RuntimeStateField::RuntimeConfiguration,
+			ClassifyRuntimeStateField(RuntimeStateField::RuntimeConfiguration),
+			"runtime configuration",
+			"RuntimeConfigStore",
+			"File-backed config, not a live parameter layer"
+		},
+		{
+			RuntimeStateField::HealthTelemetry,
+			ClassifyRuntimeStateField(RuntimeStateField::HealthTelemetry),
+			"health telemetry",
+			"HealthTelemetry",
+			"Operational observations, not source state for render values"
+		}
+	};
+}

apps/LoopThroughWithOpenGLCompositing/runtime/live/RuntimeStateLayerModel.h

@@ -0,0 +1,61 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+enum class RuntimeStateLayerKind
+{
+	BasePersisted,
+	CommittedLive,
+	TransientAutomation,
+	RenderLocal,
+	HealthConfig
+};
+
+enum class RuntimeStateField
+{
+	PersistedLayerStack,
+	PersistedParameterValues,
+	StackPresets,
+	CommittedSessionParameterValues,
+	CommittedLayerBypass,
+	RuntimeCompileReloadFlags,
+	TransientOscOverlay,
+	TransientAutomationCommitState,
+	RenderLocalTemporalHistory,
+	RenderLocalFeedbackState,
+	RenderLocalInputFrames,
+	RenderLocalOutputFrames,
+	RuntimeConfiguration,
+	HealthTelemetry
+};
+
+struct RuntimeStateLayerDescriptor
+{
+	RuntimeStateLayerKind kind = RuntimeStateLayerKind::BasePersisted;
+	const char* name = "";
+	const char* owner = "";
+	const char* lifetime = "";
+	const char* persistence = "";
+	const char* renderRole = "";
+};
+
+struct RuntimeStateFieldDescriptor
+{
+	RuntimeStateField field = RuntimeStateField::PersistedLayerStack;
+	RuntimeStateLayerKind layerKind = RuntimeStateLayerKind::BasePersisted;
+	const char* name = "";
+	const char* currentOwner = "";
+	const char* notes = "";
+};
+
+const char* RuntimeStateLayerKindName(RuntimeStateLayerKind kind);
+int RuntimeStateLayerCompositionPrecedence(RuntimeStateLayerKind kind);
+bool RuntimeStateLayerIsDurable(RuntimeStateLayerKind kind);
+bool RuntimeStateLayerParticipatesInParameterComposition(RuntimeStateLayerKind kind);
+bool RuntimeStateLayerIsRenderLocal(RuntimeStateLayerKind kind);
+
+RuntimeStateLayerKind ClassifyRuntimeStateField(RuntimeStateField field);
+std::vector<RuntimeStateLayerDescriptor> GetRuntimeStateLayerInventory();
+std::vector<RuntimeStateFieldDescriptor> GetRuntimeStateFieldInventory();
+

apps/LoopThroughWithOpenGLCompositing/runtime/persistence/PersistenceRequest.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <cstdint>
+#include <filesystem>
+#include <string>
+
+enum class PersistenceTargetKind
+{
+	RuntimeState,
+	StackPreset,
+	RuntimeConfig
+};
+
+struct PersistenceRequest
+{
+	PersistenceTargetKind targetKind = PersistenceTargetKind::RuntimeState;
+	std::string reason;
+	std::string debounceKey = "runtime-state";
+	bool debounceAllowed = true;
+	bool flushRequested = false;
+	uint64_t sequence = 0;
+
+	static PersistenceRequest RuntimeStateRequest(const std::string& reason)
+	{
+		PersistenceRequest request;
+		request.targetKind = PersistenceTargetKind::RuntimeState;
+		request.reason = reason;
+		request.debounceKey = "runtime-state";
+		request.debounceAllowed = true;
+		return request;
+	}
+};
+
+struct PersistenceSnapshot
+{
+	PersistenceTargetKind targetKind = PersistenceTargetKind::RuntimeState;
+	std::filesystem::path targetPath;
+	std::string contents;
+	std::string reason;
+	std::string debounceKey;
+	bool debounceAllowed = false;
+	bool flushRequested = false;
+	uint64_t generation = 0;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/persistence/PersistenceWriter.cpp

@@ -0,0 +1,271 @@
+#include "PersistenceWriter.h"
+
+#include <windows.h>
+
+#include <algorithm>
+#include <filesystem>
+#include <fstream>
+#include <utility>
+
+PersistenceWriter::PersistenceWriter(std::chrono::milliseconds debounceDelay, SnapshotSink sink) :
+	mDebounceDelay(debounceDelay),
+	mSink(std::move(sink))
+{
+}
+
+PersistenceWriter::~PersistenceWriter()
+{
+	std::string error;
+	StopAndFlush((std::chrono::milliseconds::max)(), error);
+}
+
+void PersistenceWriter::SetResultCallback(ResultCallback callback)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mResultCallback = std::move(callback);
+}
+
+bool PersistenceWriter::WriteSnapshot(const PersistenceSnapshot& snapshot, std::string& error)
+{
+	if (!ValidateSnapshot(snapshot, error))
+		return false;
+
+	const bool succeeded = WriteSnapshotThroughSink(snapshot, error);
+	PublishWriteResult(snapshot, succeeded, error, false);
+	return succeeded;
+}
+
+bool PersistenceWriter::EnqueueSnapshot(const PersistenceSnapshot& snapshot, std::string& error)
+{
+	if (!ValidateSnapshot(snapshot, error))
+		return false;
+
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!mAcceptingRequests)
+	{
+		error = "Persistence writer is stopping.";
+		return false;
+	}
+
+	StartWorkerLocked();
+
+	const auto now = std::chrono::steady_clock::now();
+	if (snapshot.debounceAllowed)
+	{
+		const std::string debounceKey = snapshot.debounceKey.empty() ? snapshot.targetPath.string() : snapshot.debounceKey;
+		PendingSnapshot& pending = mDebouncedSnapshots[debounceKey];
+		if (!pending.snapshot.targetPath.empty())
+			++mCoalescedCount;
+		else
+			++mEnqueuedCount;
+
+		pending.snapshot = snapshot;
+		pending.readyAt = snapshot.flushRequested ? now : now + mDebounceDelay;
+	}
+	else
+	{
+		mImmediateSnapshots.push_back(snapshot);
+		++mEnqueuedCount;
+	}
+
+	mCondition.notify_one();
+	return true;
+}
+
+bool PersistenceWriter::StopAndFlush(std::chrono::milliseconds timeout, std::string& error)
+{
+	{
+		std::lock_guard<std::mutex> lock(mMutex);
+		mAcceptingRequests = false;
+		mStopping = true;
+		const auto now = std::chrono::steady_clock::now();
+		for (auto& entry : mDebouncedSnapshots)
+			entry.second.readyAt = now;
+	}
+	mCondition.notify_all();
+
+	std::unique_lock<std::mutex> lock(mMutex);
+	if (mWorkerRunning)
+	{
+		if (timeout == (std::chrono::milliseconds::max)())
+		{
+			mCondition.wait(lock, [this]() { return !mWorkerRunning; });
+		}
+		else
+		{
+			const auto deadline = std::chrono::steady_clock::now() + timeout;
+			if (!mCondition.wait_until(lock, deadline, [this]() { return !mWorkerRunning; }))
+			{
+				error = "Timed out while flushing persistence writer.";
+				return false;
+			}
+		}
+	}
+	lock.unlock();
+
+	if (mWorker.joinable())
+		mWorker.join();
+	return true;
+}
+
+PersistenceWriterMetrics PersistenceWriter::GetMetrics() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	PersistenceWriterMetrics metrics;
+	metrics.pendingCount = PendingCountLocked();
+	metrics.enqueuedCount = mEnqueuedCount;
+	metrics.coalescedCount = mCoalescedCount;
+	metrics.writtenCount = mWrittenCount;
+	metrics.failedCount = mFailedCount;
+	return metrics;
+}
+
+bool PersistenceWriter::ValidateSnapshot(const PersistenceSnapshot& snapshot, std::string& error) const
+{
+	if (snapshot.targetPath.empty())
+	{
+		error = "Persistence snapshot target path is empty.";
+		return false;
+	}
+
+	return true;
+}
+
+bool PersistenceWriter::WriteSnapshotThroughSink(const PersistenceSnapshot& snapshot, std::string& error) const
+{
+	if (mSink)
+		return mSink(snapshot, error);
+
+	std::error_code fsError;
+	std::filesystem::create_directories(snapshot.targetPath.parent_path(), fsError);
+
+	const std::filesystem::path temporaryPath = snapshot.targetPath.string() + ".tmp";
+	std::ofstream output(temporaryPath, std::ios::binary | std::ios::trunc);
+	if (!output)
+	{
+		error = "Could not write file: " + temporaryPath.string();
+		return false;
+	}
+
+	output << snapshot.contents;
+	output.close();
+	if (!output.good())
+	{
+		error = "Could not finish writing file: " + temporaryPath.string();
+		return false;
+	}
+
+	if (!MoveFileExA(temporaryPath.string().c_str(), snapshot.targetPath.string().c_str(), MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH))
+	{
+		const DWORD lastError = GetLastError();
+		std::filesystem::remove(temporaryPath, fsError);
+		error = "Could not replace file: " + snapshot.targetPath.string() + " (Win32 error " + std::to_string(lastError) + ")";
+		return false;
+	}
+
+	return true;
+}
+
+void PersistenceWriter::PublishWriteResult(const PersistenceSnapshot& snapshot, bool succeeded, const std::string& errorMessage, bool newerRequestPending)
+{
+	ResultCallback callback;
+	{
+		std::lock_guard<std::mutex> lock(mMutex);
+		callback = mResultCallback;
+	}
+
+	if (!callback)
+		return;
+
+	PersistenceWriteResult result;
+	result.targetKind = snapshot.targetKind;
+	result.targetPath = snapshot.targetPath.string();
+	result.reason = snapshot.reason;
+	result.succeeded = succeeded;
+	result.errorMessage = errorMessage;
+	result.newerRequestPending = newerRequestPending;
+	callback(result);
+}
+
+void PersistenceWriter::StartWorkerLocked()
+{
+	if (mWorkerRunning)
+		return;
+
+	mWorkerRunning = true;
+	mWorker = std::thread([this]() { WorkerMain(); });
+}
+
+void PersistenceWriter::WorkerMain()
+{
+	for (;;)
+	{
+		PersistenceSnapshot snapshot;
+		{
+			std::unique_lock<std::mutex> lock(mMutex);
+			for (;;)
+			{
+				if (!mImmediateSnapshots.empty())
+				{
+					snapshot = std::move(mImmediateSnapshots.front());
+					mImmediateSnapshots.pop_front();
+					break;
+				}
+
+				if (!mDebouncedSnapshots.empty())
+				{
+					const auto now = std::chrono::steady_clock::now();
+					auto readyIt = mDebouncedSnapshots.end();
+					auto nextReadyAt = (std::chrono::steady_clock::time_point::max)();
+					for (auto it = mDebouncedSnapshots.begin(); it != mDebouncedSnapshots.end(); ++it)
+					{
+						if (it->second.readyAt <= now)
+						{
+							readyIt = it;
+							break;
+						}
+						if (it->second.readyAt < nextReadyAt)
+							nextReadyAt = it->second.readyAt;
+					}
+
+					if (readyIt != mDebouncedSnapshots.end())
+					{
+						snapshot = std::move(readyIt->second.snapshot);
+						mDebouncedSnapshots.erase(readyIt);
+						break;
+					}
+
+					mCondition.wait_until(lock, nextReadyAt);
+					continue;
+				}
+
+				if (mStopping)
+				{
+					mWorkerRunning = false;
+					mCondition.notify_all();
+					return;
+				}
+
+				mCondition.wait(lock);
+			}
+		}
+
+		std::string error;
+		const bool succeeded = WriteSnapshotThroughSink(snapshot, error);
+		bool newerRequestPending = false;
+		{
+			std::lock_guard<std::mutex> lock(mMutex);
+			if (succeeded)
+				++mWrittenCount;
+			else
+				++mFailedCount;
+			newerRequestPending = PendingCountLocked() > 0;
+		}
+		PublishWriteResult(snapshot, succeeded, error, newerRequestPending);
+	}
+}
+
+std::size_t PersistenceWriter::PendingCountLocked() const
+{
+	return mImmediateSnapshots.size() + mDebouncedSnapshots.size();
+}

apps/LoopThroughWithOpenGLCompositing/runtime/persistence/PersistenceWriter.h

@@ -0,0 +1,80 @@
+#pragma once
+
+#include "PersistenceRequest.h"
+
+#include <chrono>
+#include <condition_variable>
+#include <cstdint>
+#include <deque>
+#include <functional>
+#include <mutex>
+#include <string>
+#include <thread>
+#include <unordered_map>
+
+struct PersistenceWriterMetrics
+{
+	std::size_t pendingCount = 0;
+	uint64_t enqueuedCount = 0;
+	uint64_t coalescedCount = 0;
+	uint64_t writtenCount = 0;
+	uint64_t failedCount = 0;
+};
+
+struct PersistenceWriteResult
+{
+	PersistenceTargetKind targetKind = PersistenceTargetKind::RuntimeState;
+	std::string targetPath;
+	std::string reason;
+	bool succeeded = false;
+	std::string errorMessage;
+	bool newerRequestPending = false;
+};
+
+class PersistenceWriter
+{
+public:
+	using SnapshotSink = std::function<bool(const PersistenceSnapshot&, std::string&)>;
+	using ResultCallback = std::function<void(const PersistenceWriteResult&)>;
+
+	explicit PersistenceWriter(
+		std::chrono::milliseconds debounceDelay = std::chrono::milliseconds(50),
+		SnapshotSink sink = SnapshotSink());
+	~PersistenceWriter();
+
+	void SetResultCallback(ResultCallback callback);
+	bool WriteSnapshot(const PersistenceSnapshot& snapshot, std::string& error);
+	bool EnqueueSnapshot(const PersistenceSnapshot& snapshot, std::string& error);
+	bool StopAndFlush(std::chrono::milliseconds timeout, std::string& error);
+	PersistenceWriterMetrics GetMetrics() const;
+
+private:
+	struct PendingSnapshot
+	{
+		PersistenceSnapshot snapshot;
+		std::chrono::steady_clock::time_point readyAt;
+	};
+
+	bool ValidateSnapshot(const PersistenceSnapshot& snapshot, std::string& error) const;
+	bool WriteSnapshotThroughSink(const PersistenceSnapshot& snapshot, std::string& error) const;
+	void PublishWriteResult(const PersistenceSnapshot& snapshot, bool succeeded, const std::string& errorMessage, bool newerRequestPending);
+	void StartWorkerLocked();
+	void WorkerMain();
+	std::size_t PendingCountLocked() const;
+
+	std::chrono::milliseconds mDebounceDelay;
+	SnapshotSink mSink;
+	ResultCallback mResultCallback;
+	mutable std::mutex mMutex;
+	std::condition_variable mCondition;
+	std::thread mWorker;
+	bool mWorkerRunning = false;
+	bool mStopping = false;
+	bool mAcceptingRequests = true;
+	std::unordered_map<std::string, PendingSnapshot> mDebouncedSnapshots;
+	std::deque<PersistenceSnapshot> mImmediateSnapshots;
+	uint64_t mEnqueuedCount = 0;
+	uint64_t mCoalescedCount = 0;
+	uint64_t mWrittenCount = 0;
+	uint64_t mFailedCount = 0;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/presentation/RuntimeStateJson.cpp

@@ -0,0 +1,170 @@
+#include "RuntimeStateJson.h"
+
+#include "RuntimeParameterUtils.h"
+
+namespace
+{
+std::string ShaderParameterTypeToString(ShaderParameterType type)
+{
+	switch (type)
+	{
+	case ShaderParameterType::Float: return "float";
+	case ShaderParameterType::Vec2: return "vec2";
+	case ShaderParameterType::Color: return "color";
+	case ShaderParameterType::Boolean: return "bool";
+	case ShaderParameterType::Enum: return "enum";
+	case ShaderParameterType::Text: return "text";
+	case ShaderParameterType::Trigger: return "trigger";
+	}
+	return "unknown";
+}
+}
+
+JsonValue RuntimeStateJson::SerializeLayerStack(const LayerStackStore& layerStack, const ShaderPackageCatalog& shaderCatalog)
+{
+	std::map<std::string, ShaderPackage> packagesById;
+	for (const std::string& packageId : shaderCatalog.PackageOrder())
+	{
+		ShaderPackage shaderPackage;
+		if (shaderCatalog.CopyPackage(packageId, shaderPackage))
+			packagesById[packageId] = shaderPackage;
+	}
+	return SerializeLayerStack(layerStack.Layers(), packagesById);
+}
+
+JsonValue RuntimeStateJson::SerializeLayerStack(const std::vector<LayerStackStore::LayerPersistentState>& layerStates, const std::map<std::string, ShaderPackage>& packagesById)
+{
+	JsonValue layersValue = JsonValue::MakeArray();
+	for (const LayerStackStore::LayerPersistentState& layer : layerStates)
+	{
+		auto shaderIt = packagesById.find(layer.shaderId);
+		if (shaderIt == packagesById.end())
+			continue;
+		const ShaderPackage& shaderPackage = shaderIt->second;
+
+		JsonValue layerValue = JsonValue::MakeObject();
+		layerValue.set("id", JsonValue(layer.id));
+		layerValue.set("shaderId", JsonValue(layer.shaderId));
+		layerValue.set("shaderName", JsonValue(shaderPackage.displayName));
+		layerValue.set("bypass", JsonValue(layer.bypass));
+		if (shaderPackage.temporal.enabled)
+		{
+			JsonValue temporal = JsonValue::MakeObject();
+			temporal.set("enabled", JsonValue(true));
+			temporal.set("historySource", JsonValue(TemporalHistorySourceToString(shaderPackage.temporal.historySource)));
+			temporal.set("requestedHistoryLength", JsonValue(static_cast<double>(shaderPackage.temporal.requestedHistoryLength)));
+			temporal.set("effectiveHistoryLength", JsonValue(static_cast<double>(shaderPackage.temporal.effectiveHistoryLength)));
+			layerValue.set("temporal", temporal);
+		}
+		if (shaderPackage.feedback.enabled)
+		{
+			JsonValue feedback = JsonValue::MakeObject();
+			feedback.set("enabled", JsonValue(true));
+			feedback.set("writePass", JsonValue(shaderPackage.feedback.writePassId));
+			layerValue.set("feedback", feedback);
+		}
+
+		JsonValue parameters = JsonValue::MakeArray();
+		for (const ShaderParameterDefinition& definition : shaderPackage.parameters)
+		{
+			JsonValue parameter = JsonValue::MakeObject();
+			parameter.set("id", JsonValue(definition.id));
+			parameter.set("label", JsonValue(definition.label));
+			if (!definition.description.empty())
+				parameter.set("description", JsonValue(definition.description));
+			parameter.set("type", JsonValue(ShaderParameterTypeToString(definition.type)));
+			parameter.set("defaultValue", SerializeParameterValue(definition, DefaultValueForDefinition(definition)));
+
+			if (!definition.minNumbers.empty())
+			{
+				JsonValue minValue = JsonValue::MakeArray();
+				for (double number : definition.minNumbers)
+					minValue.pushBack(JsonValue(number));
+				parameter.set("min", minValue);
+			}
+			if (!definition.maxNumbers.empty())
+			{
+				JsonValue maxValue = JsonValue::MakeArray();
+				for (double number : definition.maxNumbers)
+					maxValue.pushBack(JsonValue(number));
+				parameter.set("max", maxValue);
+			}
+			if (!definition.stepNumbers.empty())
+			{
+				JsonValue stepValue = JsonValue::MakeArray();
+				for (double number : definition.stepNumbers)
+					stepValue.pushBack(JsonValue(number));
+				parameter.set("step", stepValue);
+			}
+			if (definition.type == ShaderParameterType::Enum)
+			{
+				JsonValue options = JsonValue::MakeArray();
+				for (const ShaderParameterOption& option : definition.enumOptions)
+				{
+					JsonValue optionValue = JsonValue::MakeObject();
+					optionValue.set("value", JsonValue(option.value));
+					optionValue.set("label", JsonValue(option.label));
+					options.pushBack(optionValue);
+				}
+				parameter.set("options", options);
+			}
+			if (definition.type == ShaderParameterType::Text)
+			{
+				parameter.set("maxLength", JsonValue(static_cast<double>(definition.maxLength)));
+				if (!definition.fontId.empty())
+					parameter.set("font", JsonValue(definition.fontId));
+			}
+
+			ShaderParameterValue value = DefaultValueForDefinition(definition);
+			auto valueIt = layer.parameterValues.find(definition.id);
+			if (valueIt != layer.parameterValues.end())
+				value = valueIt->second;
+			parameter.set("value", SerializeParameterValue(definition, value));
+			parameters.pushBack(parameter);
+		}
+
+		layerValue.set("parameters", parameters);
+		layersValue.pushBack(layerValue);
+	}
+	return layersValue;
+}
+
+JsonValue RuntimeStateJson::SerializeParameterValue(const ShaderParameterDefinition& definition, const ShaderParameterValue& value)
+{
+	switch (definition.type)
+	{
+	case ShaderParameterType::Boolean:
+		return JsonValue(value.booleanValue);
+	case ShaderParameterType::Enum:
+		return JsonValue(value.enumValue);
+	case ShaderParameterType::Text:
+		return JsonValue(value.textValue);
+	case ShaderParameterType::Trigger:
+		return JsonValue(value.numberValues.empty() ? 0.0 : value.numberValues.front());
+	case ShaderParameterType::Float:
+		return JsonValue(value.numberValues.empty() ? 0.0 : value.numberValues.front());
+	case ShaderParameterType::Vec2:
+	case ShaderParameterType::Color:
+	{
+		JsonValue array = JsonValue::MakeArray();
+		for (double number : value.numberValues)
+			array.pushBack(JsonValue(number));
+		return array;
+	}
+	}
+	return JsonValue();
+}
+
+std::string RuntimeStateJson::TemporalHistorySourceToString(TemporalHistorySource source)
+{
+	switch (source)
+	{
+	case TemporalHistorySource::Source:
+		return "source";
+	case TemporalHistorySource::PreLayerInput:
+		return "preLayerInput";
+	case TemporalHistorySource::None:
+	default:
+		return "none";
+	}
+}

apps/LoopThroughWithOpenGLCompositing/runtime/presentation/RuntimeStateJson.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "LayerStackStore.h"
+#include "RuntimeJson.h"
+#include "ShaderPackageCatalog.h"
+#include "ShaderTypes.h"
+
+#include <map>
+#include <string>
+#include <vector>
+
+class RuntimeStateJson
+{
+public:
+	static JsonValue SerializeLayerStack(const LayerStackStore& layerStack, const ShaderPackageCatalog& shaderCatalog);
+	static JsonValue SerializeLayerStack(const std::vector<LayerStackStore::LayerPersistentState>& layers, const std::map<std::string, ShaderPackage>& packagesById);
+	static JsonValue SerializeParameterValue(const ShaderParameterDefinition& definition, const ShaderParameterValue& value);
+	static std::string TemporalHistorySourceToString(TemporalHistorySource source);
+};

apps/LoopThroughWithOpenGLCompositing/runtime/presentation/RuntimeStatePresenter.cpp

@@ -0,0 +1,230 @@
+#include "RuntimeStatePresenter.h"
+
+#include "RuntimeStateJson.h"
+#include "RuntimeStore.h"
+
+std::string RuntimeStatePresenter::BuildRuntimeStateJson(const RuntimeStore& runtimeStore)
+{
+	return SerializeJson(BuildRuntimeStateValue(runtimeStore), true);
+}
+
+JsonValue RuntimeStatePresenter::BuildRuntimeStateValue(const RuntimeStore& runtimeStore)
+{
+	const RuntimeStatePresentationReadModel model = runtimeStore.BuildRuntimeStatePresentationReadModel();
+	const HealthTelemetry::Snapshot& telemetrySnapshot = model.telemetry;
+
+	JsonValue root = JsonValue::MakeObject();
+
+	JsonValue app = JsonValue::MakeObject();
+	app.set("serverPort", JsonValue(static_cast<double>(model.serverPort)));
+	app.set("oscPort", JsonValue(static_cast<double>(model.config.oscPort)));
+	app.set("oscBindAddress", JsonValue(model.config.oscBindAddress));
+	app.set("oscSmoothing", JsonValue(model.config.oscSmoothing));
+	app.set("autoReload", JsonValue(model.autoReloadEnabled));
+	app.set("maxTemporalHistoryFrames", JsonValue(static_cast<double>(model.config.maxTemporalHistoryFrames)));
+	app.set("previewFps", JsonValue(static_cast<double>(model.config.previewFps)));
+	app.set("enableExternalKeying", JsonValue(model.config.enableExternalKeying));
+	app.set("inputVideoFormat", JsonValue(model.config.inputVideoFormat));
+	app.set("inputFrameRate", JsonValue(model.config.inputFrameRate));
+	app.set("outputVideoFormat", JsonValue(model.config.outputVideoFormat));
+	app.set("outputFrameRate", JsonValue(model.config.outputFrameRate));
+	root.set("app", app);
+
+	JsonValue runtime = JsonValue::MakeObject();
+	runtime.set("layerCount", JsonValue(static_cast<double>(model.layerStack.LayerCount())));
+	runtime.set("compileSucceeded", JsonValue(model.compileSucceeded));
+	runtime.set("compileMessage", JsonValue(model.compileMessage));
+	root.set("runtime", runtime);
+
+	JsonValue video = JsonValue::MakeObject();
+	video.set("hasSignal", JsonValue(telemetrySnapshot.signal.hasSignal));
+	video.set("width", JsonValue(static_cast<double>(telemetrySnapshot.signal.width)));
+	video.set("height", JsonValue(static_cast<double>(telemetrySnapshot.signal.height)));
+	video.set("modeName", JsonValue(telemetrySnapshot.signal.modeName));
+	root.set("video", video);
+
+	JsonValue deckLink = JsonValue::MakeObject();
+	deckLink.set("modelName", JsonValue(telemetrySnapshot.videoIO.modelName));
+	deckLink.set("supportsInternalKeying", JsonValue(telemetrySnapshot.videoIO.supportsInternalKeying));
+	deckLink.set("supportsExternalKeying", JsonValue(telemetrySnapshot.videoIO.supportsExternalKeying));
+	deckLink.set("keyerInterfaceAvailable", JsonValue(telemetrySnapshot.videoIO.keyerInterfaceAvailable));
+	deckLink.set("externalKeyingRequested", JsonValue(telemetrySnapshot.videoIO.externalKeyingRequested));
+	deckLink.set("externalKeyingActive", JsonValue(telemetrySnapshot.videoIO.externalKeyingActive));
+	deckLink.set("statusMessage", JsonValue(telemetrySnapshot.videoIO.statusMessage));
+	deckLink.set("actualBufferedFramesAvailable", JsonValue(telemetrySnapshot.backendPlayout.actualDeckLinkBufferedFramesAvailable));
+	deckLink.set("actualBufferedFrames", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.actualDeckLinkBufferedFrames)));
+	deckLink.set("targetBufferedFrames", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.targetDeckLinkBufferedFrames)));
+	deckLink.set("scheduleCallMs", JsonValue(telemetrySnapshot.backendPlayout.deckLinkScheduleCallMilliseconds));
+	deckLink.set("scheduleFailures", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.deckLinkScheduleFailureCount)));
+	root.set("decklink", deckLink);
+
+	JsonValue videoIO = JsonValue::MakeObject();
+	videoIO.set("backend", JsonValue(telemetrySnapshot.videoIO.backendName));
+	videoIO.set("modelName", JsonValue(telemetrySnapshot.videoIO.modelName));
+	videoIO.set("supportsInternalKeying", JsonValue(telemetrySnapshot.videoIO.supportsInternalKeying));
+	videoIO.set("supportsExternalKeying", JsonValue(telemetrySnapshot.videoIO.supportsExternalKeying));
+	videoIO.set("keyerInterfaceAvailable", JsonValue(telemetrySnapshot.videoIO.keyerInterfaceAvailable));
+	videoIO.set("externalKeyingRequested", JsonValue(telemetrySnapshot.videoIO.externalKeyingRequested));
+	videoIO.set("externalKeyingActive", JsonValue(telemetrySnapshot.videoIO.externalKeyingActive));
+	videoIO.set("statusMessage", JsonValue(telemetrySnapshot.videoIO.statusMessage));
+	root.set("videoIO", videoIO);
+
+	JsonValue performance = JsonValue::MakeObject();
+	performance.set("frameBudgetMs", JsonValue(telemetrySnapshot.performance.frameBudgetMilliseconds));
+	performance.set("renderMs", JsonValue(telemetrySnapshot.performance.renderMilliseconds));
+	performance.set("smoothedRenderMs", JsonValue(telemetrySnapshot.performance.smoothedRenderMilliseconds));
+	performance.set("budgetUsedPercent", JsonValue(
+		telemetrySnapshot.performance.frameBudgetMilliseconds > 0.0
+			? (telemetrySnapshot.performance.smoothedRenderMilliseconds / telemetrySnapshot.performance.frameBudgetMilliseconds) * 100.0
+			: 0.0));
+	performance.set("completionIntervalMs", JsonValue(telemetrySnapshot.performance.completionIntervalMilliseconds));
+	performance.set("smoothedCompletionIntervalMs", JsonValue(telemetrySnapshot.performance.smoothedCompletionIntervalMilliseconds));
+	performance.set("maxCompletionIntervalMs", JsonValue(telemetrySnapshot.performance.maxCompletionIntervalMilliseconds));
+	performance.set("lateFrameCount", JsonValue(static_cast<double>(telemetrySnapshot.performance.lateFrameCount)));
+	performance.set("droppedFrameCount", JsonValue(static_cast<double>(telemetrySnapshot.performance.droppedFrameCount)));
+	performance.set("flushedFrameCount", JsonValue(static_cast<double>(telemetrySnapshot.performance.flushedFrameCount)));
+	root.set("performance", performance);
+
+	JsonValue readyQueue = JsonValue::MakeObject();
+	readyQueue.set("depth", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.readyQueueDepth)));
+	readyQueue.set("capacity", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.readyQueueCapacity)));
+	readyQueue.set("minDepth", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.minReadyQueueDepth)));
+	readyQueue.set("maxDepth", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.maxReadyQueueDepth)));
+	readyQueue.set("zeroDepthCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.readyQueueZeroDepthCount)));
+	readyQueue.set("pushedCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.readyQueuePushedCount)));
+	readyQueue.set("poppedCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.readyQueuePoppedCount)));
+	readyQueue.set("droppedCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.readyQueueDroppedCount)));
+	readyQueue.set("underrunCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.readyQueueUnderrunCount)));
+
+	JsonValue systemMemory = JsonValue::MakeObject();
+	systemMemory.set("freeFrameCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.systemFramePoolFree)));
+	systemMemory.set("readyFrameCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.systemFramePoolReady)));
+	systemMemory.set("scheduledFrameCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.systemFramePoolScheduled)));
+	systemMemory.set("underrunCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.systemFrameUnderrunCount)));
+	systemMemory.set("repeatCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.systemFrameRepeatCount)));
+	systemMemory.set("dropCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.systemFrameDropCount)));
+	systemMemory.set("ageAtScheduleMs", JsonValue(telemetrySnapshot.backendPlayout.systemFrameAgeAtScheduleMilliseconds));
+	systemMemory.set("ageAtCompletionMs", JsonValue(telemetrySnapshot.backendPlayout.systemFrameAgeAtCompletionMilliseconds));
+
+	JsonValue outputRender = JsonValue::MakeObject();
+	outputRender.set("renderMs", JsonValue(telemetrySnapshot.backendPlayout.outputRenderMilliseconds));
+	outputRender.set("smoothedRenderMs", JsonValue(telemetrySnapshot.backendPlayout.smoothedOutputRenderMilliseconds));
+	outputRender.set("maxRenderMs", JsonValue(telemetrySnapshot.backendPlayout.maxOutputRenderMilliseconds));
+	outputRender.set("acquireFrameMs", JsonValue(telemetrySnapshot.backendPlayout.outputFrameAcquireMilliseconds));
+	outputRender.set("renderRequestMs", JsonValue(telemetrySnapshot.backendPlayout.outputFrameRenderRequestMilliseconds));
+	outputRender.set("endAccessMs", JsonValue(telemetrySnapshot.backendPlayout.outputFrameEndAccessMilliseconds));
+	outputRender.set("queueWaitMs", JsonValue(telemetrySnapshot.backendPlayout.outputRenderQueueWaitMilliseconds));
+	outputRender.set("drawMs", JsonValue(telemetrySnapshot.backendPlayout.outputRenderDrawMilliseconds));
+	outputRender.set("fenceWaitMs", JsonValue(telemetrySnapshot.backendPlayout.outputReadbackFenceWaitMilliseconds));
+	outputRender.set("mapMs", JsonValue(telemetrySnapshot.backendPlayout.outputReadbackMapMilliseconds));
+	outputRender.set("readbackCopyMs", JsonValue(telemetrySnapshot.backendPlayout.outputReadbackCopyMilliseconds));
+	outputRender.set("cachedCopyMs", JsonValue(telemetrySnapshot.backendPlayout.outputCachedCopyMilliseconds));
+	outputRender.set("asyncQueueMs", JsonValue(telemetrySnapshot.backendPlayout.outputAsyncQueueMilliseconds));
+	outputRender.set("asyncQueueBufferMs", JsonValue(telemetrySnapshot.backendPlayout.outputAsyncQueueBufferMilliseconds));
+	outputRender.set("asyncQueueSetupMs", JsonValue(telemetrySnapshot.backendPlayout.outputAsyncQueueSetupMilliseconds));
+	outputRender.set("asyncQueueReadPixelsMs", JsonValue(telemetrySnapshot.backendPlayout.outputAsyncQueueReadPixelsMilliseconds));
+	outputRender.set("asyncQueueFenceMs", JsonValue(telemetrySnapshot.backendPlayout.outputAsyncQueueFenceMilliseconds));
+	outputRender.set("syncReadMs", JsonValue(telemetrySnapshot.backendPlayout.outputSyncReadMilliseconds));
+	outputRender.set("asyncReadbackMissCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.outputAsyncReadbackMissCount)));
+	outputRender.set("cachedFallbackCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.outputCachedFallbackCount)));
+	outputRender.set("syncFallbackCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.outputSyncFallbackCount)));
+
+	JsonValue recovery = JsonValue::MakeObject();
+	recovery.set("completionResult", JsonValue(telemetrySnapshot.backendPlayout.completionResult));
+	recovery.set("completedFrameIndex", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.completedFrameIndex)));
+	recovery.set("scheduledFrameIndex", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.scheduledFrameIndex)));
+	recovery.set("scheduledLeadFrames", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.scheduledLeadFrames)));
+	recovery.set("syntheticScheduledLeadFrames", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.scheduledLeadFrames)));
+	recovery.set("measuredLagFrames", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.measuredLagFrames)));
+	recovery.set("catchUpFrames", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.catchUpFrames)));
+	recovery.set("lateStreak", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.lateStreak)));
+	recovery.set("dropStreak", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.dropStreak)));
+
+	JsonValue deckLinkPlayout = JsonValue::MakeObject();
+	deckLinkPlayout.set("actualBufferedFramesAvailable", JsonValue(telemetrySnapshot.backendPlayout.actualDeckLinkBufferedFramesAvailable));
+	deckLinkPlayout.set("actualBufferedFrames", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.actualDeckLinkBufferedFrames)));
+	deckLinkPlayout.set("targetBufferedFrames", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.targetDeckLinkBufferedFrames)));
+	deckLinkPlayout.set("scheduleCallMs", JsonValue(telemetrySnapshot.backendPlayout.deckLinkScheduleCallMilliseconds));
+	deckLinkPlayout.set("scheduleFailures", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.deckLinkScheduleFailureCount)));
+
+	JsonValue scheduler = JsonValue::MakeObject();
+	scheduler.set("syntheticLeadFrames", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.scheduledLeadFrames)));
+
+	JsonValue backendPlayout = JsonValue::MakeObject();
+	backendPlayout.set("lifecycleState", JsonValue(telemetrySnapshot.backendPlayout.lifecycleState));
+	backendPlayout.set("degraded", JsonValue(telemetrySnapshot.backendPlayout.degraded));
+	backendPlayout.set("statusMessage", JsonValue(telemetrySnapshot.backendPlayout.statusMessage));
+	backendPlayout.set("lateFrameCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.lateFrameCount)));
+	backendPlayout.set("droppedFrameCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.droppedFrameCount)));
+	backendPlayout.set("flushedFrameCount", JsonValue(static_cast<double>(telemetrySnapshot.backendPlayout.flushedFrameCount)));
+	backendPlayout.set("readyQueue", readyQueue);
+	backendPlayout.set("systemMemory", systemMemory);
+	backendPlayout.set("outputRender", outputRender);
+	backendPlayout.set("decklink", deckLinkPlayout);
+	backendPlayout.set("scheduler", scheduler);
+	backendPlayout.set("recovery", recovery);
+	root.set("backendPlayout", backendPlayout);
+
+	JsonValue eventQueue = JsonValue::MakeObject();
+	eventQueue.set("name", JsonValue(telemetrySnapshot.runtimeEvents.queue.queueName));
+	eventQueue.set("depth", JsonValue(static_cast<double>(telemetrySnapshot.runtimeEvents.queue.depth)));
+	eventQueue.set("capacity", JsonValue(static_cast<double>(telemetrySnapshot.runtimeEvents.queue.capacity)));
+	eventQueue.set("droppedCount", JsonValue(static_cast<double>(telemetrySnapshot.runtimeEvents.queue.droppedCount)));
+	eventQueue.set("oldestEventAgeMs", JsonValue(telemetrySnapshot.runtimeEvents.queue.oldestEventAgeMilliseconds));
+
+	JsonValue eventDispatch = JsonValue::MakeObject();
+	eventDispatch.set("dispatchCallCount", JsonValue(static_cast<double>(telemetrySnapshot.runtimeEvents.dispatch.dispatchCallCount)));
+	eventDispatch.set("dispatchedEventCount", JsonValue(static_cast<double>(telemetrySnapshot.runtimeEvents.dispatch.dispatchedEventCount)));
+	eventDispatch.set("handlerInvocationCount", JsonValue(static_cast<double>(telemetrySnapshot.runtimeEvents.dispatch.handlerInvocationCount)));
+	eventDispatch.set("handlerFailureCount", JsonValue(static_cast<double>(telemetrySnapshot.runtimeEvents.dispatch.handlerFailureCount)));
+	eventDispatch.set("lastDispatchDurationMs", JsonValue(telemetrySnapshot.runtimeEvents.dispatch.lastDispatchDurationMilliseconds));
+	eventDispatch.set("maxDispatchDurationMs", JsonValue(telemetrySnapshot.runtimeEvents.dispatch.maxDispatchDurationMilliseconds));
+
+	JsonValue runtimeEvents = JsonValue::MakeObject();
+	runtimeEvents.set("queue", eventQueue);
+	runtimeEvents.set("dispatch", eventDispatch);
+	root.set("runtimeEvents", runtimeEvents);
+
+	JsonValue shaderLibrary = JsonValue::MakeArray();
+	for (const ShaderPackageStatus& status : model.packageStatuses)
+	{
+		JsonValue shader = JsonValue::MakeObject();
+		shader.set("id", JsonValue(status.id));
+		shader.set("name", JsonValue(status.displayName));
+		shader.set("description", JsonValue(status.description));
+		shader.set("category", JsonValue(status.category));
+		shader.set("available", JsonValue(status.available));
+		if (!status.available)
+			shader.set("error", JsonValue(status.error));
+
+		auto shaderIt = model.shaderCatalog.packagesById.find(status.id);
+		if (status.available && shaderIt != model.shaderCatalog.packagesById.end() && shaderIt->second.temporal.enabled)
+		{
+			const ShaderPackage& shaderPackage = shaderIt->second;
+			JsonValue temporal = JsonValue::MakeObject();
+			temporal.set("enabled", JsonValue(true));
+			temporal.set("historySource", JsonValue(RuntimeStateJson::TemporalHistorySourceToString(shaderPackage.temporal.historySource)));
+			temporal.set("requestedHistoryLength", JsonValue(static_cast<double>(shaderPackage.temporal.requestedHistoryLength)));
+			temporal.set("effectiveHistoryLength", JsonValue(static_cast<double>(shaderPackage.temporal.effectiveHistoryLength)));
+			shader.set("temporal", temporal);
+		}
+		if (status.available && shaderIt != model.shaderCatalog.packagesById.end() && shaderIt->second.feedback.enabled)
+		{
+			const ShaderPackage& shaderPackage = shaderIt->second;
+			JsonValue feedback = JsonValue::MakeObject();
+			feedback.set("enabled", JsonValue(true));
+			feedback.set("writePass", JsonValue(shaderPackage.feedback.writePassId));
+			shader.set("feedback", feedback);
+		}
+		shaderLibrary.pushBack(shader);
+	}
+	root.set("shaders", shaderLibrary);
+
+	JsonValue stackPresets = JsonValue::MakeArray();
+	for (const std::string& presetName : model.stackPresetNames)
+		stackPresets.pushBack(JsonValue(presetName));
+	root.set("stackPresets", stackPresets);
+
+	root.set("layers", RuntimeStateJson::SerializeLayerStack(model.layerStack.Layers(), model.shaderCatalog.packagesById));
+	return root;
+}

apps/LoopThroughWithOpenGLCompositing/runtime/presentation/RuntimeStatePresenter.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "RuntimeJson.h"
+
+#include <string>
+
+class RuntimeStore;
+
+class RuntimeStatePresenter
+{
+public:
+	static std::string BuildRuntimeStateJson(const RuntimeStore& runtimeStore);
+	static JsonValue BuildRuntimeStateValue(const RuntimeStore& runtimeStore);
+};

apps/LoopThroughWithOpenGLCompositing/runtime/snapshot/RenderSnapshotBuilder.cpp

@@ -0,0 +1,193 @@
+#include "RenderSnapshotBuilder.h"
+
+#include "RuntimeClock.h"
+#include "RuntimeParameterUtils.h"
+#include "RuntimeStore.h"
+#include "ShaderCompiler.h"
+
+#include <algorithm>
+#include <chrono>
+#include <filesystem>
+#include <mutex>
+#include <utility>
+
+RenderSnapshotBuilder::RenderSnapshotBuilder(RuntimeStore& runtimeStore) :
+	mRuntimeStore(runtimeStore)
+{
+}
+
+bool RenderSnapshotBuilder::BuildLayerPassFragmentShaderSources(const std::string& layerId, std::vector<ShaderPassBuildSource>& passSources, std::string& error) const
+{
+	try
+	{
+		ShaderPackage shaderPackage;
+		if (!mRuntimeStore.CopyShaderPackageForStoredLayer(layerId, shaderPackage, error))
+			return false;
+
+		const ShaderCompilerInputs inputs = mRuntimeStore.GetShaderCompilerInputs();
+
+		ShaderCompiler compiler(
+			inputs.repoRoot,
+			inputs.wrapperPath,
+			inputs.generatedGlslPath,
+			inputs.patchedGlslPath,
+			inputs.maxTemporalHistoryFrames);
+		passSources.clear();
+		passSources.reserve(shaderPackage.passes.size());
+		for (const ShaderPassDefinition& pass : shaderPackage.passes)
+		{
+			ShaderPassBuildSource passSource;
+			passSource.passId = pass.id;
+			passSource.inputNames = pass.inputNames;
+			passSource.outputName = pass.outputName;
+			if (!compiler.BuildPassFragmentShaderSource(shaderPackage, pass, passSource.fragmentShaderSource, error))
+				return false;
+			passSources.push_back(std::move(passSource));
+		}
+		return true;
+	}
+	catch (const std::exception& exception)
+	{
+		error = std::string("RenderSnapshotBuilder::BuildLayerPassFragmentShaderSources exception: ") + exception.what();
+		return false;
+	}
+	catch (...)
+	{
+		error = "RenderSnapshotBuilder::BuildLayerPassFragmentShaderSources threw a non-standard exception.";
+		return false;
+	}
+}
+
+unsigned RenderSnapshotBuilder::GetMaxTemporalHistoryFrames() const
+{
+	return mRuntimeStore.GetConfiguredMaxTemporalHistoryFrames();
+}
+
+RuntimeSnapshotVersions RenderSnapshotBuilder::GetVersions() const
+{
+	RuntimeSnapshotVersions versions;
+	versions.renderStateVersion = mRenderStateVersion.load(std::memory_order_relaxed);
+	versions.parameterStateVersion = mParameterStateVersion.load(std::memory_order_relaxed);
+	return versions;
+}
+
+void RenderSnapshotBuilder::AdvanceFrame()
+{
+	++mFrameCounter;
+}
+
+void RenderSnapshotBuilder::BuildLayerRenderStates(unsigned outputWidth, unsigned outputHeight, std::vector<RuntimeRenderState>& states) const
+{
+	BuildLayerRenderStates(outputWidth, outputHeight, mRuntimeStore.BuildRenderSnapshotReadModel(), states);
+}
+
+bool RenderSnapshotBuilder::TryBuildLayerRenderStates(unsigned outputWidth, unsigned outputHeight, std::vector<RuntimeRenderState>& states) const
+{
+	BuildLayerRenderStates(outputWidth, outputHeight, mRuntimeStore.BuildRenderSnapshotReadModel(), states);
+	return true;
+}
+
+bool RenderSnapshotBuilder::TryRefreshLayerParameters(std::vector<RuntimeRenderState>& states) const
+{
+	RefreshLayerParameters(mRuntimeStore.CopyCommittedLiveLayerStates(), states);
+	return true;
+}
+
+void RenderSnapshotBuilder::RefreshDynamicRenderStateFields(std::vector<RuntimeRenderState>& states) const
+{
+	RefreshDynamicRenderStateFields(mRuntimeStore.GetRenderTimingSnapshot(), states);
+}
+
+void RenderSnapshotBuilder::MarkRenderStateDirty()
+{
+	mRenderStateVersion.fetch_add(1, std::memory_order_relaxed);
+	mParameterStateVersion.fetch_add(1, std::memory_order_relaxed);
+}
+
+void RenderSnapshotBuilder::MarkParameterStateDirty()
+{
+	mParameterStateVersion.fetch_add(1, std::memory_order_relaxed);
+}
+
+void RenderSnapshotBuilder::BuildLayerRenderStates(unsigned outputWidth, unsigned outputHeight, const RenderSnapshotReadModel& readModel, std::vector<RuntimeRenderState>& states) const
+{
+	states.clear();
+
+	for (const LayerStackStore::LayerPersistentState& layer : readModel.committedLiveState.layers)
+	{
+		auto shaderIt = readModel.committedLiveState.packagesById.find(layer.shaderId);
+		if (shaderIt == readModel.committedLiveState.packagesById.end())
+			continue;
+		const ShaderPackage& shaderPackage = shaderIt->second;
+
+		RuntimeRenderState state;
+		state.layerId = layer.id;
+		state.shaderId = layer.shaderId;
+		state.shaderName = shaderPackage.displayName;
+		state.mixAmount = 1.0;
+		state.bypass = layer.bypass ? 1.0 : 0.0;
+		state.inputWidth = readModel.signalStatus.width;
+		state.inputHeight = readModel.signalStatus.height;
+		state.outputWidth = outputWidth;
+		state.outputHeight = outputHeight;
+		state.parameterDefinitions = shaderPackage.parameters;
+		state.textureAssets = shaderPackage.textureAssets;
+		state.fontAssets = shaderPackage.fontAssets;
+		state.isTemporal = shaderPackage.temporal.enabled;
+		state.temporalHistorySource = shaderPackage.temporal.historySource;
+		state.requestedTemporalHistoryLength = shaderPackage.temporal.requestedHistoryLength;
+		state.effectiveTemporalHistoryLength = shaderPackage.temporal.effectiveHistoryLength;
+		state.feedback = shaderPackage.feedback;
+
+		for (const ShaderParameterDefinition& definition : shaderPackage.parameters)
+		{
+			ShaderParameterValue value = DefaultValueForDefinition(definition);
+			auto valueIt = layer.parameterValues.find(definition.id);
+			if (valueIt != layer.parameterValues.end())
+				value = valueIt->second;
+			state.parameterValues[definition.id] = value;
+		}
+
+		states.push_back(state);
+	}
+
+	RefreshDynamicRenderStateFields(readModel.timing, states);
+}
+
+void RenderSnapshotBuilder::RefreshLayerParameters(const std::vector<LayerStackStore::LayerPersistentState>& layers, std::vector<RuntimeRenderState>& states) const
+{
+	for (RuntimeRenderState& state : states)
+	{
+		const auto layerIt = std::find_if(layers.begin(), layers.end(),
+			[&state](const LayerStackStore::LayerPersistentState& layer) { return layer.id == state.layerId; });
+		if (layerIt == layers.end())
+			continue;
+
+		state.bypass = layerIt->bypass ? 1.0 : 0.0;
+		state.parameterValues.clear();
+		for (const ShaderParameterDefinition& definition : state.parameterDefinitions)
+		{
+			ShaderParameterValue value = DefaultValueForDefinition(definition);
+			auto valueIt = layerIt->parameterValues.find(definition.id);
+			if (valueIt != layerIt->parameterValues.end())
+				value = valueIt->second;
+			state.parameterValues[definition.id] = value;
+		}
+	}
+}
+
+void RenderSnapshotBuilder::RefreshDynamicRenderStateFields(const RenderTimingSnapshot& timing, std::vector<RuntimeRenderState>& states) const
+{
+	const RuntimeClockSnapshot clock = GetRuntimeClockSnapshot();
+	const double timeSeconds = std::chrono::duration_cast<std::chrono::duration<double>>(std::chrono::steady_clock::now() - timing.startTime).count();
+	const double frameCount = static_cast<double>(mFrameCounter.load(std::memory_order_relaxed));
+
+	for (RuntimeRenderState& state : states)
+	{
+		state.timeSeconds = timeSeconds;
+		state.utcTimeSeconds = clock.utcTimeSeconds;
+		state.utcOffsetSeconds = clock.utcOffsetSeconds;
+		state.startupRandom = timing.startupRandom;
+		state.frameCount = frameCount;
+	}
+}

apps/LoopThroughWithOpenGLCompositing/runtime/snapshot/RenderSnapshotBuilder.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include "RuntimeStoreReadModels.h"
+#include "ShaderTypes.h"
+
+#include <atomic>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+class RuntimeStore;
+
+struct RuntimeSnapshotVersions
+{
+	uint64_t renderStateVersion = 0;
+	uint64_t parameterStateVersion = 0;
+};
+
+class RenderSnapshotBuilder
+{
+public:
+	explicit RenderSnapshotBuilder(RuntimeStore& runtimeStore);
+
+	bool BuildLayerPassFragmentShaderSources(const std::string& layerId, std::vector<ShaderPassBuildSource>& passSources, std::string& error) const;
+	unsigned GetMaxTemporalHistoryFrames() const;
+	RuntimeSnapshotVersions GetVersions() const;
+	void AdvanceFrame();
+	void BuildLayerRenderStates(unsigned outputWidth, unsigned outputHeight, std::vector<RuntimeRenderState>& states) const;
+	bool TryBuildLayerRenderStates(unsigned outputWidth, unsigned outputHeight, std::vector<RuntimeRenderState>& states) const;
+	bool TryRefreshLayerParameters(std::vector<RuntimeRenderState>& states) const;
+	void RefreshDynamicRenderStateFields(std::vector<RuntimeRenderState>& states) const;
+	void MarkRenderStateDirty();
+	void MarkParameterStateDirty();
+
+private:
+	void BuildLayerRenderStates(unsigned outputWidth, unsigned outputHeight, const RenderSnapshotReadModel& readModel, std::vector<RuntimeRenderState>& states) const;
+	void RefreshLayerParameters(const std::vector<LayerStackStore::LayerPersistentState>& layers, std::vector<RuntimeRenderState>& states) const;
+	void RefreshDynamicRenderStateFields(const RenderTimingSnapshot& timing, std::vector<RuntimeRenderState>& states) const;
+
+	RuntimeStore& mRuntimeStore;
+	std::atomic<uint64_t> mFrameCounter{ 0 };
+	std::atomic<uint64_t> mRenderStateVersion{ 0 };
+	std::atomic<uint64_t> mParameterStateVersion{ 0 };
+};

apps/LoopThroughWithOpenGLCompositing/runtime/snapshot/RuntimeSnapshotProvider.cpp

@@ -0,0 +1,196 @@
+#include "RuntimeSnapshotProvider.h"
+
+#include "RuntimeEventDispatcher.h"
+
+#include <windows.h>
+
+#include <utility>
+
+RuntimeSnapshotProvider::RuntimeSnapshotProvider(RenderSnapshotBuilder& renderSnapshotBuilder, RuntimeEventDispatcher& runtimeEventDispatcher) :
+	mRenderSnapshotBuilder(renderSnapshotBuilder),
+	mRuntimeEventDispatcher(runtimeEventDispatcher)
+{
+}
+
+bool RuntimeSnapshotProvider::BuildLayerPassFragmentShaderSources(const std::string& layerId, std::vector<ShaderPassBuildSource>& passSources, std::string& error) const
+{
+	try
+	{
+		return mRenderSnapshotBuilder.BuildLayerPassFragmentShaderSources(layerId, passSources, error);
+	}
+	catch (const std::exception& exception)
+	{
+		error = std::string("RuntimeSnapshotProvider::BuildLayerPassFragmentShaderSources exception: ") + exception.what();
+		return false;
+	}
+	catch (...)
+	{
+		error = "RuntimeSnapshotProvider::BuildLayerPassFragmentShaderSources threw a non-standard exception.";
+		return false;
+	}
+}
+
+unsigned RuntimeSnapshotProvider::GetMaxTemporalHistoryFrames() const
+{
+	return mRenderSnapshotBuilder.GetMaxTemporalHistoryFrames();
+}
+
+RuntimeSnapshotVersions RuntimeSnapshotProvider::GetVersions() const
+{
+	return mRenderSnapshotBuilder.GetVersions();
+}
+
+void RuntimeSnapshotProvider::AdvanceFrame()
+{
+	mRenderSnapshotBuilder.AdvanceFrame();
+}
+
+RuntimeRenderStateSnapshot RuntimeSnapshotProvider::PublishRenderStateSnapshot(unsigned outputWidth, unsigned outputHeight) const
+{
+	PublishRenderSnapshotPublishRequested(outputWidth, outputHeight, "publish-render-state-snapshot");
+
+	for (;;)
+	{
+		const RuntimeSnapshotVersions versionsBefore = GetVersions();
+		RuntimeRenderStateSnapshot publishedSnapshot;
+		if (TryGetPublishedRenderStateSnapshot(outputWidth, outputHeight, versionsBefore, publishedSnapshot))
+		{
+			PublishRenderSnapshotPublished(publishedSnapshot);
+			return publishedSnapshot;
+		}
+
+		RuntimeRenderStateSnapshot snapshot;
+		snapshot.outputWidth = outputWidth;
+		snapshot.outputHeight = outputHeight;
+		mRenderSnapshotBuilder.BuildLayerRenderStates(outputWidth, outputHeight, snapshot.states);
+
+		const RuntimeSnapshotVersions versionsAfter = GetVersions();
+		if (versionsBefore.renderStateVersion == versionsAfter.renderStateVersion &&
+			versionsBefore.parameterStateVersion == versionsAfter.parameterStateVersion)
+		{
+			snapshot.versions = versionsAfter;
+			StorePublishedRenderStateSnapshot(snapshot);
+			PublishRenderSnapshotPublished(snapshot);
+			return snapshot;
+		}
+	}
+}
+
+bool RuntimeSnapshotProvider::TryPublishRenderStateSnapshot(unsigned outputWidth, unsigned outputHeight, RuntimeRenderStateSnapshot& snapshot) const
+{
+	PublishRenderSnapshotPublishRequested(outputWidth, outputHeight, "try-publish-render-state-snapshot");
+
+	const RuntimeSnapshotVersions versionsBefore = GetVersions();
+	if (TryGetPublishedRenderStateSnapshot(outputWidth, outputHeight, versionsBefore, snapshot))
+	{
+		PublishRenderSnapshotPublished(snapshot);
+		return true;
+	}
+
+	std::vector<RuntimeRenderState> states;
+	if (!mRenderSnapshotBuilder.TryBuildLayerRenderStates(outputWidth, outputHeight, states))
+		return false;
+
+	const RuntimeSnapshotVersions versionsAfter = GetVersions();
+	if (versionsBefore.renderStateVersion != versionsAfter.renderStateVersion ||
+		versionsBefore.parameterStateVersion != versionsAfter.parameterStateVersion)
+	{
+		return false;
+	}
+
+	snapshot.outputWidth = outputWidth;
+	snapshot.outputHeight = outputHeight;
+	snapshot.versions = versionsAfter;
+	snapshot.states = std::move(states);
+	StorePublishedRenderStateSnapshot(snapshot);
+	PublishRenderSnapshotPublished(snapshot);
+	return true;
+}
+
+bool RuntimeSnapshotProvider::TryRefreshPublishedSnapshotParameters(RuntimeRenderStateSnapshot& snapshot) const
+{
+	const uint64_t expectedRenderStateVersion = snapshot.versions.renderStateVersion;
+	if (!mRenderSnapshotBuilder.TryRefreshLayerParameters(snapshot.states))
+		return false;
+
+	const RuntimeSnapshotVersions versions = GetVersions();
+	if (versions.renderStateVersion != expectedRenderStateVersion)
+		return false;
+
+	snapshot.versions = versions;
+	StorePublishedRenderStateSnapshot(snapshot);
+	PublishRenderSnapshotPublished(snapshot);
+	return true;
+}
+
+void RuntimeSnapshotProvider::RefreshDynamicRenderStateFields(std::vector<RuntimeRenderState>& states) const
+{
+	mRenderSnapshotBuilder.RefreshDynamicRenderStateFields(states);
+}
+
+bool RuntimeSnapshotProvider::TryGetPublishedRenderStateSnapshot(unsigned outputWidth, unsigned outputHeight,
+	const RuntimeSnapshotVersions& versions, RuntimeRenderStateSnapshot& snapshot) const
+{
+	std::lock_guard<std::mutex> lock(mPublishedSnapshotMutex);
+	if (!mHasPublishedRenderStateSnapshot ||
+		!SnapshotMatches(mPublishedRenderStateSnapshot, outputWidth, outputHeight, versions))
+	{
+		return false;
+	}
+
+	snapshot = mPublishedRenderStateSnapshot;
+	return true;
+}
+
+void RuntimeSnapshotProvider::StorePublishedRenderStateSnapshot(const RuntimeRenderStateSnapshot& snapshot) const
+{
+	std::lock_guard<std::mutex> lock(mPublishedSnapshotMutex);
+	mPublishedRenderStateSnapshot = snapshot;
+	mHasPublishedRenderStateSnapshot = true;
+}
+
+bool RuntimeSnapshotProvider::SnapshotMatches(const RuntimeRenderStateSnapshot& snapshot, unsigned outputWidth, unsigned outputHeight,
+	const RuntimeSnapshotVersions& versions)
+{
+	return snapshot.outputWidth == outputWidth &&
+		snapshot.outputHeight == outputHeight &&
+		snapshot.versions.renderStateVersion == versions.renderStateVersion &&
+		snapshot.versions.parameterStateVersion == versions.parameterStateVersion;
+}
+
+void RuntimeSnapshotProvider::PublishRenderSnapshotPublishRequested(unsigned outputWidth, unsigned outputHeight, const std::string& reason) const
+{
+	try
+	{
+		RenderSnapshotPublishRequestedEvent event;
+		event.outputWidth = outputWidth;
+		event.outputHeight = outputHeight;
+		event.reason = reason;
+		if (!mRuntimeEventDispatcher.PublishPayload(event, "RuntimeSnapshotProvider"))
+			OutputDebugStringA("RenderSnapshotPublishRequested event publish failed.\n");
+	}
+	catch (...)
+	{
+		OutputDebugStringA("RenderSnapshotPublishRequested event publish threw.\n");
+	}
+}
+
+void RuntimeSnapshotProvider::PublishRenderSnapshotPublished(const RuntimeRenderStateSnapshot& snapshot) const
+{
+	try
+	{
+		RenderSnapshotPublishedEvent event;
+		event.snapshotVersion = snapshot.versions.renderStateVersion;
+		event.structureVersion = snapshot.versions.renderStateVersion;
+		event.parameterVersion = snapshot.versions.parameterStateVersion;
+		event.outputWidth = snapshot.outputWidth;
+		event.outputHeight = snapshot.outputHeight;
+		event.layerCount = snapshot.states.size();
+		if (!mRuntimeEventDispatcher.PublishPayload(event, "RuntimeSnapshotProvider"))
+			OutputDebugStringA("RenderSnapshotPublished event publish failed.\n");
+	}
+	catch (...)
+	{
+		OutputDebugStringA("RenderSnapshotPublished event publish threw.\n");
+	}
+}

apps/LoopThroughWithOpenGLCompositing/runtime/snapshot/RuntimeSnapshotProvider.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include "RenderSnapshotBuilder.h"
+
+#include <mutex>
+#include <string>
+#include <vector>
+
+class RuntimeEventDispatcher;
+
+struct RuntimeRenderStateSnapshot
+{
+	RuntimeSnapshotVersions versions;
+	unsigned outputWidth = 0;
+	unsigned outputHeight = 0;
+	std::vector<RuntimeRenderState> states;
+};
+
+class RuntimeSnapshotProvider
+{
+public:
+	RuntimeSnapshotProvider(RenderSnapshotBuilder& renderSnapshotBuilder, RuntimeEventDispatcher& runtimeEventDispatcher);
+
+	bool BuildLayerPassFragmentShaderSources(const std::string& layerId, std::vector<ShaderPassBuildSource>& passSources, std::string& error) const;
+	unsigned GetMaxTemporalHistoryFrames() const;
+	RuntimeSnapshotVersions GetVersions() const;
+	void AdvanceFrame();
+	RuntimeRenderStateSnapshot PublishRenderStateSnapshot(unsigned outputWidth, unsigned outputHeight) const;
+	bool TryPublishRenderStateSnapshot(unsigned outputWidth, unsigned outputHeight, RuntimeRenderStateSnapshot& snapshot) const;
+	bool TryRefreshPublishedSnapshotParameters(RuntimeRenderStateSnapshot& snapshot) const;
+	void RefreshDynamicRenderStateFields(std::vector<RuntimeRenderState>& states) const;
+
+private:
+	bool TryGetPublishedRenderStateSnapshot(unsigned outputWidth, unsigned outputHeight,
+		const RuntimeSnapshotVersions& versions, RuntimeRenderStateSnapshot& snapshot) const;
+	void StorePublishedRenderStateSnapshot(const RuntimeRenderStateSnapshot& snapshot) const;
+	static bool SnapshotMatches(const RuntimeRenderStateSnapshot& snapshot, unsigned outputWidth, unsigned outputHeight,
+		const RuntimeSnapshotVersions& versions);
+	void PublishRenderSnapshotPublishRequested(unsigned outputWidth, unsigned outputHeight, const std::string& reason) const;
+	void PublishRenderSnapshotPublished(const RuntimeRenderStateSnapshot& snapshot) const;
+
+	RenderSnapshotBuilder& mRenderSnapshotBuilder;
+	RuntimeEventDispatcher& mRuntimeEventDispatcher;
+	mutable std::mutex mPublishedSnapshotMutex;
+	mutable bool mHasPublishedRenderStateSnapshot = false;
+	mutable RuntimeRenderStateSnapshot mPublishedRenderStateSnapshot;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/store/LayerStackStore.cpp

@@ -0,0 +1,738 @@
+#include "LayerStackStore.h"
+
+#include "RuntimeParameterUtils.h"
+#include "RuntimeStateJson.h"
+
+#include <algorithm>
+#include <cctype>
+#include <cmath>
+#include <set>
+#include <sstream>
+#include <utility>
+
+namespace
+{
+std::string TrimCopy(const std::string& text)
+{
+	std::size_t start = 0;
+	while (start < text.size() && std::isspace(static_cast<unsigned char>(text[start])))
+		++start;
+
+	std::size_t end = text.size();
+	while (end > start && std::isspace(static_cast<unsigned char>(text[end - 1])))
+		--end;
+
+	return text.substr(start, end - start);
+}
+
+std::string SimplifyControlKey(const std::string& text)
+{
+	std::string simplified;
+	for (unsigned char ch : text)
+	{
+		if (std::isalnum(ch))
+			simplified.push_back(static_cast<char>(std::tolower(ch)));
+	}
+	return simplified;
+}
+
+bool MatchesControlKey(const std::string& candidate, const std::string& key)
+{
+	return candidate == key || SimplifyControlKey(candidate) == SimplifyControlKey(key);
+}
+
+bool TryParseLayerIdNumber(const std::string& layerId, uint64_t& number)
+{
+	const std::string prefix = "layer-";
+	if (layerId.rfind(prefix, 0) != 0 || layerId.size() == prefix.size())
+		return false;
+
+	uint64_t parsed = 0;
+	for (std::size_t index = prefix.size(); index < layerId.size(); ++index)
+	{
+		const unsigned char ch = static_cast<unsigned char>(layerId[index]);
+		if (!std::isdigit(ch))
+			return false;
+		parsed = parsed * 10 + static_cast<uint64_t>(ch - '0');
+	}
+
+	number = parsed;
+	return true;
+}
+
+}
+
+bool LayerStackStore::LoadPersistentStateValue(const JsonValue& root)
+{
+	if (const JsonValue* layersValue = root.find("layers"))
+	{
+		for (const JsonValue& layerValue : layersValue->asArray())
+		{
+			if (!layerValue.isObject())
+				continue;
+			LayerPersistentState layer;
+			if (const JsonValue* idValue = layerValue.find("id"))
+				layer.id = idValue->asString();
+			if (const JsonValue* shaderIdValue = layerValue.find("shaderId"))
+				layer.shaderId = shaderIdValue->asString();
+			if (const JsonValue* bypassValue = layerValue.find("bypass"))
+				layer.bypass = bypassValue->asBoolean(false);
+			else if (const JsonValue* enabledValue = layerValue.find("enabled"))
+				layer.bypass = !enabledValue->asBoolean(true);
+
+			if (const JsonValue* parameterValues = layerValue.find("parameterValues"))
+			{
+				for (const auto& parameterItem : parameterValues->asObject())
+				{
+					ShaderParameterValue value;
+					const JsonValue& jsonValue = parameterItem.second;
+					if (jsonValue.isBoolean())
+						value.booleanValue = jsonValue.asBoolean();
+					else if (jsonValue.isString())
+						value.enumValue = jsonValue.asString();
+					else if (jsonValue.isNumber())
+						value.numberValues.push_back(jsonValue.asNumber());
+					else if (jsonValue.isArray())
+						value.numberValues = JsonArrayToNumbers(jsonValue);
+					layer.parameterValues[parameterItem.first] = value;
+				}
+			}
+
+			if (!layer.shaderId.empty())
+				mLayers.push_back(layer);
+		}
+	}
+	else
+	{
+		std::string activeShaderId;
+		if (const JsonValue* activeShaderValue = root.find("activeShaderId"))
+			activeShaderId = activeShaderValue->asString();
+
+		if (!activeShaderId.empty())
+		{
+			LayerPersistentState layer;
+			layer.id = GenerateLayerId(mLayers, mNextLayerId);
+			layer.shaderId = activeShaderId;
+			layer.bypass = false;
+
+			if (const JsonValue* valuesByShader = root.find("parameterValuesByShader"))
+			{
+				const JsonValue* shaderValues = valuesByShader->find(activeShaderId);
+				if (shaderValues)
+				{
+					for (const auto& parameterItem : shaderValues->asObject())
+					{
+						ShaderParameterValue value;
+						const JsonValue& jsonValue = parameterItem.second;
+						if (jsonValue.isBoolean())
+							value.booleanValue = jsonValue.asBoolean();
+						else if (jsonValue.isString())
+							value.enumValue = jsonValue.asString();
+						else if (jsonValue.isNumber())
+							value.numberValues.push_back(jsonValue.asNumber());
+						else if (jsonValue.isArray())
+							value.numberValues = JsonArrayToNumbers(jsonValue);
+						layer.parameterValues[parameterItem.first] = value;
+					}
+				}
+			}
+
+			mLayers.push_back(layer);
+		}
+	}
+
+	return true;
+}
+
+JsonValue LayerStackStore::BuildPersistentStateValue(const ShaderPackageCatalog& shaderCatalog) const
+{
+	JsonValue root = JsonValue::MakeObject();
+	JsonValue layers = JsonValue::MakeArray();
+	for (const LayerPersistentState& layer : mLayers)
+	{
+		JsonValue layerValue = JsonValue::MakeObject();
+		layerValue.set("id", JsonValue(layer.id));
+		layerValue.set("shaderId", JsonValue(layer.shaderId));
+		layerValue.set("bypass", JsonValue(layer.bypass));
+
+		JsonValue parameterValues = JsonValue::MakeObject();
+		const ShaderPackage* shaderPackage = shaderCatalog.FindPackage(layer.shaderId);
+		for (const auto& parameterItem : layer.parameterValues)
+		{
+			const ShaderParameterDefinition* definition = nullptr;
+			if (shaderPackage)
+			{
+				for (const ShaderParameterDefinition& candidate : shaderPackage->parameters)
+				{
+					if (candidate.id == parameterItem.first)
+					{
+						definition = &candidate;
+						break;
+					}
+				}
+			}
+
+			if (definition)
+				parameterValues.set(parameterItem.first, RuntimeStateJson::SerializeParameterValue(*definition, parameterItem.second));
+		}
+
+		layerValue.set("parameterValues", parameterValues);
+		layers.pushBack(layerValue);
+	}
+	root.set("layers", layers);
+	return root;
+}
+
+void LayerStackStore::NormalizeLayerIds()
+{
+	std::set<std::string> usedIds;
+	uint64_t maxLayerNumber = mNextLayerId;
+
+	for (LayerPersistentState& layer : mLayers)
+	{
+		uint64_t layerNumber = 0;
+		const bool hasReusableId = !layer.id.empty() &&
+			usedIds.find(layer.id) == usedIds.end() &&
+			TryParseLayerIdNumber(layer.id, layerNumber);
+
+		if (hasReusableId)
+		{
+			usedIds.insert(layer.id);
+			maxLayerNumber = (std::max)(maxLayerNumber, layerNumber);
+			continue;
+		}
+
+		do
+		{
+			++maxLayerNumber;
+			layer.id = "layer-" + std::to_string(maxLayerNumber);
+		}
+		while (usedIds.find(layer.id) != usedIds.end());
+
+		usedIds.insert(layer.id);
+	}
+
+	mNextLayerId = maxLayerNumber;
+}
+
+void LayerStackStore::EnsureDefaultsForAllLayers(const ShaderPackageCatalog& shaderCatalog)
+{
+	for (LayerPersistentState& layer : mLayers)
+	{
+		const ShaderPackage* shaderPackage = shaderCatalog.FindPackage(layer.shaderId);
+		if (shaderPackage)
+			EnsureLayerDefaults(layer, *shaderPackage);
+	}
+}
+
+void LayerStackStore::EnsureDefaultLayer(const ShaderPackageCatalog& shaderCatalog)
+{
+	if (!mLayers.empty() || shaderCatalog.PackageOrder().empty())
+		return;
+
+	LayerPersistentState layer;
+	layer.id = GenerateLayerId(mLayers, mNextLayerId);
+	layer.shaderId = shaderCatalog.PackageOrder().front();
+	layer.bypass = false;
+	if (const ShaderPackage* shaderPackage = shaderCatalog.FindPackage(layer.shaderId))
+		EnsureLayerDefaults(layer, *shaderPackage);
+	mLayers.push_back(layer);
+}
+
+void LayerStackStore::RemoveLayersWithMissingPackages(const ShaderPackageCatalog& shaderCatalog)
+{
+	for (auto it = mLayers.begin(); it != mLayers.end();)
+	{
+		if (!shaderCatalog.HasPackage(it->shaderId))
+			it = mLayers.erase(it);
+		else
+			++it;
+	}
+}
+
+bool LayerStackStore::CreateLayer(const ShaderPackageCatalog& shaderCatalog, const std::string& shaderId, std::string& error)
+{
+	const ShaderPackage* shaderPackage = shaderCatalog.FindPackage(shaderId);
+	if (!shaderPackage)
+	{
+		error = "Unknown shader id: " + shaderId;
+		return false;
+	}
+
+	LayerPersistentState layer;
+	layer.id = GenerateLayerId(mLayers, mNextLayerId);
+	layer.shaderId = shaderId;
+	layer.bypass = false;
+	EnsureLayerDefaults(layer, *shaderPackage);
+	mLayers.push_back(layer);
+	return true;
+}
+
+bool LayerStackStore::DeleteLayer(const std::string& layerId, std::string& error)
+{
+	auto it = std::find_if(mLayers.begin(), mLayers.end(),
+		[&layerId](const LayerPersistentState& layer) { return layer.id == layerId; });
+	if (it == mLayers.end())
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	mLayers.erase(it);
+	return true;
+}
+
+bool LayerStackStore::MoveLayer(const std::string& layerId, int direction, std::string& error)
+{
+	auto it = std::find_if(mLayers.begin(), mLayers.end(),
+		[&layerId](const LayerPersistentState& layer) { return layer.id == layerId; });
+	if (it == mLayers.end())
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	const std::ptrdiff_t index = std::distance(mLayers.begin(), it);
+	const std::ptrdiff_t newIndex = index + direction;
+	if (newIndex < 0 || newIndex >= static_cast<std::ptrdiff_t>(mLayers.size()))
+		return true;
+
+	std::swap(mLayers[index], mLayers[newIndex]);
+	return true;
+}
+
+bool LayerStackStore::MoveLayerToIndex(const std::string& layerId, std::size_t targetIndex, std::string& error)
+{
+	auto it = std::find_if(mLayers.begin(), mLayers.end(),
+		[&layerId](const LayerPersistentState& layer) { return layer.id == layerId; });
+	if (it == mLayers.end())
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	if (mLayers.empty())
+		return true;
+
+	if (targetIndex >= mLayers.size())
+		targetIndex = mLayers.size() - 1;
+
+	const std::size_t sourceIndex = static_cast<std::size_t>(std::distance(mLayers.begin(), it));
+	if (sourceIndex == targetIndex)
+		return true;
+
+	LayerPersistentState movedLayer = *it;
+	mLayers.erase(mLayers.begin() + static_cast<std::ptrdiff_t>(sourceIndex));
+	mLayers.insert(mLayers.begin() + static_cast<std::ptrdiff_t>(targetIndex), movedLayer);
+	return true;
+}
+
+bool LayerStackStore::SetLayerBypassState(const std::string& layerId, bool bypassed, std::string& error)
+{
+	LayerPersistentState* layer = FindLayerById(layerId);
+	if (!layer)
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	layer->bypass = bypassed;
+	return true;
+}
+
+bool LayerStackStore::SetLayerShaderSelection(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, const std::string& shaderId, std::string& error)
+{
+	LayerPersistentState* layer = FindLayerById(layerId);
+	if (!layer)
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	const ShaderPackage* shaderPackage = shaderCatalog.FindPackage(shaderId);
+	if (!shaderPackage)
+	{
+		error = "Unknown shader id: " + shaderId;
+		return false;
+	}
+
+	layer->shaderId = shaderId;
+	layer->parameterValues.clear();
+	EnsureLayerDefaults(*layer, *shaderPackage);
+	return true;
+}
+
+bool LayerStackStore::SetParameterValue(const std::string& layerId, const std::string& parameterId, const ShaderParameterValue& value, std::string& error)
+{
+	LayerPersistentState* layer = FindLayerById(layerId);
+	if (!layer)
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	layer->parameterValues[parameterId] = value;
+	return true;
+}
+
+bool LayerStackStore::ResetLayerParameterValues(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, std::string& error)
+{
+	LayerPersistentState* layer = FindLayerById(layerId);
+	if (!layer)
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	const ShaderPackage* shaderPackage = shaderCatalog.FindPackage(layer->shaderId);
+	if (!shaderPackage)
+	{
+		error = "Unknown shader id: " + layer->shaderId;
+		return false;
+	}
+
+	layer->parameterValues.clear();
+	EnsureLayerDefaults(*layer, *shaderPackage);
+	return true;
+}
+
+bool LayerStackStore::HasLayer(const std::string& layerId) const
+{
+	return FindLayerById(layerId) != nullptr;
+}
+
+bool LayerStackStore::TryGetParameterById(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, const std::string& parameterId, StoredParameterSnapshot& snapshot, std::string& error) const
+{
+	const LayerPersistentState* layer = FindLayerById(layerId);
+	if (!layer)
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	const ShaderPackage* shaderPackage = shaderCatalog.FindPackage(layer->shaderId);
+	if (!shaderPackage)
+	{
+		error = "Unknown shader id: " + layer->shaderId;
+		return false;
+	}
+
+	auto parameterIt = std::find_if(shaderPackage->parameters.begin(), shaderPackage->parameters.end(),
+		[&parameterId](const ShaderParameterDefinition& definition) { return definition.id == parameterId; });
+	if (parameterIt == shaderPackage->parameters.end())
+	{
+		error = "Unknown parameter id: " + parameterId;
+		return false;
+	}
+
+	snapshot = StoredParameterSnapshot();
+	snapshot.layerId = layer->id;
+	snapshot.definition = *parameterIt;
+	auto valueIt = layer->parameterValues.find(parameterIt->id);
+	if (valueIt != layer->parameterValues.end())
+	{
+		snapshot.currentValue = valueIt->second;
+		snapshot.hasCurrentValue = true;
+	}
+	return true;
+}
+
+bool LayerStackStore::TryGetParameterByControlKey(const ShaderPackageCatalog& shaderCatalog, const std::string& layerKey, const std::string& parameterKey, StoredParameterSnapshot& snapshot, std::string& error) const
+{
+	const LayerPersistentState* matchedLayer = nullptr;
+	const ShaderPackage* matchedPackage = nullptr;
+
+	for (const LayerPersistentState& layer : mLayers)
+	{
+		const ShaderPackage* shaderPackage = shaderCatalog.FindPackage(layer.shaderId);
+		if (!shaderPackage)
+			continue;
+
+		if (MatchesControlKey(layer.id, layerKey) || MatchesControlKey(shaderPackage->id, layerKey) ||
+			MatchesControlKey(shaderPackage->displayName, layerKey))
+		{
+			matchedLayer = &layer;
+			matchedPackage = shaderPackage;
+			break;
+		}
+	}
+
+	if (!matchedLayer || !matchedPackage)
+	{
+		error = "Unknown OSC layer key: " + layerKey;
+		return false;
+	}
+
+	auto parameterIt = std::find_if(matchedPackage->parameters.begin(), matchedPackage->parameters.end(),
+		[&parameterKey](const ShaderParameterDefinition& definition)
+		{
+			return MatchesControlKey(definition.id, parameterKey) || MatchesControlKey(definition.label, parameterKey);
+		});
+	if (parameterIt == matchedPackage->parameters.end())
+	{
+		error = "Unknown OSC parameter key: " + parameterKey;
+		return false;
+	}
+
+	snapshot = StoredParameterSnapshot();
+	snapshot.layerId = matchedLayer->id;
+	snapshot.definition = *parameterIt;
+	auto valueIt = matchedLayer->parameterValues.find(parameterIt->id);
+	if (valueIt != matchedLayer->parameterValues.end())
+	{
+		snapshot.currentValue = valueIt->second;
+		snapshot.hasCurrentValue = true;
+	}
+	return true;
+}
+
+bool LayerStackStore::ResolveLayerMove(const std::string& layerId, int direction, bool& shouldMove, std::string& error) const
+{
+	auto it = std::find_if(mLayers.begin(), mLayers.end(),
+		[&layerId](const LayerPersistentState& layer) { return layer.id == layerId; });
+	if (it == mLayers.end())
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	const std::ptrdiff_t index = std::distance(mLayers.begin(), it);
+	const std::ptrdiff_t newIndex = index + direction;
+	shouldMove = newIndex >= 0 && newIndex < static_cast<std::ptrdiff_t>(mLayers.size()) && newIndex != index;
+	return true;
+}
+
+bool LayerStackStore::ResolveLayerMoveToIndex(const std::string& layerId, std::size_t targetIndex, bool& shouldMove, std::string& error) const
+{
+	auto it = std::find_if(mLayers.begin(), mLayers.end(),
+		[&layerId](const LayerPersistentState& layer) { return layer.id == layerId; });
+	if (it == mLayers.end())
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	if (mLayers.empty())
+	{
+		shouldMove = false;
+		return true;
+	}
+
+	const std::size_t clampedTargetIndex = (std::min)(targetIndex, mLayers.size() - 1);
+	const std::size_t sourceIndex = static_cast<std::size_t>(std::distance(mLayers.begin(), it));
+	shouldMove = sourceIndex != clampedTargetIndex;
+	return true;
+}
+
+JsonValue LayerStackStore::BuildStackPresetValue(const ShaderPackageCatalog& shaderCatalog, const std::string& presetName) const
+{
+	JsonValue root = JsonValue::MakeObject();
+	root.set("version", JsonValue(1.0));
+	root.set("name", JsonValue(TrimCopy(presetName)));
+	root.set("layers", RuntimeStateJson::SerializeLayerStack(*this, shaderCatalog));
+	return root;
+}
+
+bool LayerStackStore::LoadStackPresetValue(const ShaderPackageCatalog& shaderCatalog, const JsonValue& root, std::string& error)
+{
+	const JsonValue* layersValue = root.find("layers");
+	if (!layersValue || !layersValue->isArray())
+	{
+		error = "Preset file is missing a valid 'layers' array.";
+		return false;
+	}
+
+	std::vector<LayerPersistentState> nextLayers;
+	uint64_t nextLayerId = mNextLayerId;
+	if (!DeserializeLayerStack(shaderCatalog, *layersValue, nextLayers, nextLayerId, error))
+		return false;
+
+	if (nextLayers.empty())
+	{
+		error = "Preset does not contain any valid layers.";
+		return false;
+	}
+
+	mLayers = std::move(nextLayers);
+	mNextLayerId = nextLayerId;
+	return true;
+}
+
+std::string LayerStackStore::MakeSafePresetFileStem(const std::string& presetName)
+{
+	return ::MakeSafePresetFileStem(presetName);
+}
+
+const std::vector<LayerStackStore::LayerPersistentState>& LayerStackStore::Layers() const
+{
+	return mLayers;
+}
+
+std::vector<LayerStackStore::LayerPersistentState>& LayerStackStore::Layers()
+{
+	return mLayers;
+}
+
+std::size_t LayerStackStore::LayerCount() const
+{
+	return mLayers.size();
+}
+
+const LayerStackStore::LayerPersistentState* LayerStackStore::FindLayerById(const std::string& layerId) const
+{
+	auto it = std::find_if(mLayers.begin(), mLayers.end(),
+		[&layerId](const LayerPersistentState& layer) { return layer.id == layerId; });
+	return it == mLayers.end() ? nullptr : &*it;
+}
+
+LayerStackStore::LayerPersistentState* LayerStackStore::FindLayerById(const std::string& layerId)
+{
+	auto it = std::find_if(mLayers.begin(), mLayers.end(),
+		[&layerId](const LayerPersistentState& layer) { return layer.id == layerId; });
+	return it == mLayers.end() ? nullptr : &*it;
+}
+
+ShaderParameterValue LayerStackStore::DefaultValueForDefinition(const ShaderParameterDefinition& definition)
+{
+	return ::DefaultValueForDefinition(definition);
+}
+
+void LayerStackStore::EnsureLayerDefaults(LayerPersistentState& layerState, const ShaderPackage& shaderPackage)
+{
+	for (const ShaderParameterDefinition& definition : shaderPackage.parameters)
+	{
+		auto valueIt = layerState.parameterValues.find(definition.id);
+		if (valueIt == layerState.parameterValues.end())
+		{
+			layerState.parameterValues[definition.id] = DefaultValueForDefinition(definition);
+			continue;
+		}
+
+		JsonValue valueJson;
+		bool shouldNormalize = true;
+		switch (definition.type)
+		{
+		case ShaderParameterType::Float:
+			if (valueIt->second.numberValues.empty())
+				shouldNormalize = false;
+			else
+				valueJson = JsonValue(valueIt->second.numberValues.front());
+			break;
+		case ShaderParameterType::Vec2:
+		case ShaderParameterType::Color:
+			valueJson = JsonValue::MakeArray();
+			for (double number : valueIt->second.numberValues)
+				valueJson.pushBack(JsonValue(number));
+			break;
+		case ShaderParameterType::Boolean:
+			valueJson = JsonValue(valueIt->second.booleanValue);
+			break;
+		case ShaderParameterType::Enum:
+			valueJson = JsonValue(valueIt->second.enumValue);
+			break;
+		case ShaderParameterType::Text:
+		{
+			const std::string textValue = !valueIt->second.textValue.empty()
+				? valueIt->second.textValue
+				: valueIt->second.enumValue;
+			if (textValue.empty())
+			{
+				valueIt->second = DefaultValueForDefinition(definition);
+				shouldNormalize = false;
+			}
+			else
+			{
+				valueJson = JsonValue(textValue);
+			}
+			break;
+		}
+		case ShaderParameterType::Trigger:
+			if (valueIt->second.numberValues.empty())
+				valueJson = JsonValue(0.0);
+			else
+				valueJson = JsonValue((std::max)(0.0, std::floor(valueIt->second.numberValues.front())));
+			break;
+		}
+
+		if (!shouldNormalize)
+			continue;
+
+		ShaderParameterValue normalizedValue;
+		std::string normalizeError;
+		if (NormalizeAndValidateParameterValue(definition, valueJson, normalizedValue, normalizeError))
+			valueIt->second = normalizedValue;
+		else
+			valueIt->second = DefaultValueForDefinition(definition);
+	}
+}
+
+bool LayerStackStore::DeserializeLayerStack(const ShaderPackageCatalog& shaderCatalog, const JsonValue& layersValue, std::vector<LayerPersistentState>& layers, uint64_t& nextLayerId, std::string& error)
+{
+	for (const JsonValue& layerValue : layersValue.asArray())
+	{
+		if (!layerValue.isObject())
+			continue;
+
+		const JsonValue* shaderIdValue = layerValue.find("shaderId");
+		if (!shaderIdValue)
+			continue;
+
+		const std::string shaderId = shaderIdValue->asString();
+		const ShaderPackage* shaderPackage = shaderCatalog.FindPackage(shaderId);
+		if (!shaderPackage)
+		{
+			error = "Preset references unknown shader id: " + shaderId;
+			return false;
+		}
+
+		LayerPersistentState layer;
+		layer.id = GenerateLayerId(layers, nextLayerId);
+		layer.shaderId = shaderId;
+		if (const JsonValue* bypassValue = layerValue.find("bypass"))
+			layer.bypass = bypassValue->asBoolean(false);
+
+		if (const JsonValue* parametersValue = layerValue.find("parameters"))
+		{
+			for (const JsonValue& parameterValue : parametersValue->asArray())
+			{
+				if (!parameterValue.isObject())
+					continue;
+
+				const JsonValue* parameterIdValue = parameterValue.find("id");
+				const JsonValue* valueValue = parameterValue.find("value");
+				if (!parameterIdValue || !valueValue)
+					continue;
+
+				const std::string parameterId = parameterIdValue->asString();
+				auto definitionIt = std::find_if(shaderPackage->parameters.begin(), shaderPackage->parameters.end(),
+					[&parameterId](const ShaderParameterDefinition& definition) { return definition.id == parameterId; });
+				if (definitionIt == shaderPackage->parameters.end())
+					continue;
+
+				ShaderParameterValue normalizedValue;
+				if (!NormalizeAndValidateParameterValue(*definitionIt, *valueValue, normalizedValue, error))
+					return false;
+
+				layer.parameterValues[parameterId] = normalizedValue;
+			}
+		}
+
+		EnsureLayerDefaults(layer, *shaderPackage);
+		layers.push_back(layer);
+	}
+
+	return true;
+}
+
+std::string LayerStackStore::GenerateLayerId(std::vector<LayerPersistentState>& layers, uint64_t& nextLayerId)
+{
+	while (true)
+	{
+		++nextLayerId;
+		const std::string candidate = "layer-" + std::to_string(nextLayerId);
+		auto it = std::find_if(layers.begin(), layers.end(),
+			[&candidate](const LayerPersistentState& layer) { return layer.id == candidate; });
+		if (it == layers.end())
+			return candidate;
+	}
+}

apps/LoopThroughWithOpenGLCompositing/runtime/store/LayerStackStore.h

@@ -0,0 +1,72 @@
+#pragma once
+
+#include "RuntimeJson.h"
+#include "ShaderPackageCatalog.h"
+#include "ShaderTypes.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <map>
+#include <string>
+#include <vector>
+
+class LayerStackStore
+{
+public:
+	struct LayerPersistentState
+	{
+		std::string id;
+		std::string shaderId;
+		bool bypass = false;
+		std::map<std::string, ShaderParameterValue> parameterValues;
+	};
+
+	struct StoredParameterSnapshot
+	{
+		std::string layerId;
+		ShaderParameterDefinition definition;
+		ShaderParameterValue currentValue;
+		bool hasCurrentValue = false;
+	};
+
+	bool LoadPersistentStateValue(const JsonValue& root);
+	JsonValue BuildPersistentStateValue(const ShaderPackageCatalog& shaderCatalog) const;
+	void NormalizeLayerIds();
+	void EnsureDefaultsForAllLayers(const ShaderPackageCatalog& shaderCatalog);
+	void EnsureDefaultLayer(const ShaderPackageCatalog& shaderCatalog);
+	void RemoveLayersWithMissingPackages(const ShaderPackageCatalog& shaderCatalog);
+
+	bool CreateLayer(const ShaderPackageCatalog& shaderCatalog, const std::string& shaderId, std::string& error);
+	bool DeleteLayer(const std::string& layerId, std::string& error);
+	bool MoveLayer(const std::string& layerId, int direction, std::string& error);
+	bool MoveLayerToIndex(const std::string& layerId, std::size_t targetIndex, std::string& error);
+	bool SetLayerBypassState(const std::string& layerId, bool bypassed, std::string& error);
+	bool SetLayerShaderSelection(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, const std::string& shaderId, std::string& error);
+	bool SetParameterValue(const std::string& layerId, const std::string& parameterId, const ShaderParameterValue& value, std::string& error);
+	bool ResetLayerParameterValues(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, std::string& error);
+
+	bool HasLayer(const std::string& layerId) const;
+	bool TryGetParameterById(const ShaderPackageCatalog& shaderCatalog, const std::string& layerId, const std::string& parameterId, StoredParameterSnapshot& snapshot, std::string& error) const;
+	bool TryGetParameterByControlKey(const ShaderPackageCatalog& shaderCatalog, const std::string& layerKey, const std::string& parameterKey, StoredParameterSnapshot& snapshot, std::string& error) const;
+	bool ResolveLayerMove(const std::string& layerId, int direction, bool& shouldMove, std::string& error) const;
+	bool ResolveLayerMoveToIndex(const std::string& layerId, std::size_t targetIndex, bool& shouldMove, std::string& error) const;
+
+	JsonValue BuildStackPresetValue(const ShaderPackageCatalog& shaderCatalog, const std::string& presetName) const;
+	bool LoadStackPresetValue(const ShaderPackageCatalog& shaderCatalog, const JsonValue& root, std::string& error);
+	static std::string MakeSafePresetFileStem(const std::string& presetName);
+
+	const std::vector<LayerPersistentState>& Layers() const;
+	std::vector<LayerPersistentState>& Layers();
+	std::size_t LayerCount() const;
+	const LayerPersistentState* FindLayerById(const std::string& layerId) const;
+	LayerPersistentState* FindLayerById(const std::string& layerId);
+
+private:
+	static ShaderParameterValue DefaultValueForDefinition(const ShaderParameterDefinition& definition);
+	static void EnsureLayerDefaults(LayerPersistentState& layerState, const ShaderPackage& shaderPackage);
+	static bool DeserializeLayerStack(const ShaderPackageCatalog& shaderCatalog, const JsonValue& layersValue, std::vector<LayerPersistentState>& layers, uint64_t& nextLayerId, std::string& error);
+	static std::string GenerateLayerId(std::vector<LayerPersistentState>& layers, uint64_t& nextLayerId);
+
+	std::vector<LayerPersistentState> mLayers;
+	uint64_t mNextLayerId = 0;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/store/RuntimeConfigStore.cpp

@@ -0,0 +1,270 @@
+#include "RuntimeConfigStore.h"
+
+#include "RuntimeJson.h"
+
+#include <algorithm>
+#include <fstream>
+#include <sstream>
+#include <vector>
+#include <windows.h>
+
+namespace
+{
+double Clamp01(double value)
+{
+	return (std::max)(0.0, (std::min)(1.0, value));
+}
+
+bool LooksLikePackagedRuntimeRoot(const std::filesystem::path& candidate)
+{
+	return std::filesystem::exists(candidate / "config" / "runtime-host.json") &&
+		std::filesystem::exists(candidate / "runtime" / "templates" / "shader_wrapper.slang.in") &&
+		std::filesystem::exists(candidate / "shaders");
+}
+
+bool LooksLikeRepoRoot(const std::filesystem::path& candidate)
+{
+	return std::filesystem::exists(candidate / "CMakeLists.txt") &&
+		std::filesystem::exists(candidate / "apps" / "LoopThroughWithOpenGLCompositing");
+}
+
+std::filesystem::path FindRepoRootCandidate()
+{
+	std::vector<std::filesystem::path> rootsToTry;
+
+	char currentDirectory[MAX_PATH] = {};
+	if (GetCurrentDirectoryA(MAX_PATH, currentDirectory) > 0)
+		rootsToTry.push_back(std::filesystem::path(currentDirectory));
+
+	char modulePath[MAX_PATH] = {};
+	DWORD moduleLength = GetModuleFileNameA(NULL, modulePath, MAX_PATH);
+	if (moduleLength > 0 && moduleLength < MAX_PATH)
+		rootsToTry.push_back(std::filesystem::path(modulePath).parent_path());
+
+	for (const std::filesystem::path& startPath : rootsToTry)
+	{
+		std::filesystem::path candidate = startPath;
+		for (int depth = 0; depth < 10 && !candidate.empty(); ++depth)
+		{
+			if (LooksLikePackagedRuntimeRoot(candidate) || LooksLikeRepoRoot(candidate))
+				return candidate;
+
+			candidate = candidate.parent_path();
+		}
+	}
+
+	return std::filesystem::path();
+}
+}
+
+bool RuntimeConfigStore::Initialize(std::string& error)
+{
+	if (!ResolvePaths(error))
+		return false;
+	if (!LoadConfig(error))
+		return false;
+	RefreshConfigDependentPaths();
+	return true;
+}
+
+const RuntimeConfigStore::AppConfig& RuntimeConfigStore::GetConfig() const
+{
+	return mConfig;
+}
+
+const std::filesystem::path& RuntimeConfigStore::GetRepoRoot() const
+{
+	return mRepoRoot;
+}
+
+const std::filesystem::path& RuntimeConfigStore::GetUiRoot() const
+{
+	return mUiRoot;
+}
+
+const std::filesystem::path& RuntimeConfigStore::GetDocsRoot() const
+{
+	return mDocsRoot;
+}
+
+const std::filesystem::path& RuntimeConfigStore::GetShaderRoot() const
+{
+	return mShaderRoot;
+}
+
+const std::filesystem::path& RuntimeConfigStore::GetRuntimeRoot() const
+{
+	return mRuntimeRoot;
+}
+
+const std::filesystem::path& RuntimeConfigStore::GetPresetRoot() const
+{
+	return mPresetRoot;
+}
+
+const std::filesystem::path& RuntimeConfigStore::GetRuntimeStatePath() const
+{
+	return mRuntimeStatePath;
+}
+
+const std::filesystem::path& RuntimeConfigStore::GetWrapperPath() const
+{
+	return mWrapperPath;
+}
+
+const std::filesystem::path& RuntimeConfigStore::GetGeneratedGlslPath() const
+{
+	return mGeneratedGlslPath;
+}
+
+const std::filesystem::path& RuntimeConfigStore::GetPatchedGlslPath() const
+{
+	return mPatchedGlslPath;
+}
+
+void RuntimeConfigStore::SetBoundControlServerPort(unsigned short port)
+{
+	mConfig.serverPort = port;
+}
+
+bool RuntimeConfigStore::ResolvePaths(std::string& error)
+{
+	mRepoRoot = FindRepoRootCandidate();
+	if (mRepoRoot.empty())
+	{
+		error = "Could not locate the repository root from the current runtime path.";
+		return false;
+	}
+
+	const std::filesystem::path builtUiRoot = mRepoRoot / "ui" / "dist";
+	mUiRoot = std::filesystem::exists(builtUiRoot) ? builtUiRoot : (mRepoRoot / "ui");
+	mDocsRoot = mRepoRoot / "docs";
+	mConfigPath = mRepoRoot / "config" / "runtime-host.json";
+	mRuntimeRoot = mRepoRoot / "runtime";
+	mPresetRoot = mRuntimeRoot / "stack_presets";
+	mRuntimeStatePath = mRuntimeRoot / "runtime_state.json";
+	RefreshConfigDependentPaths();
+
+	std::error_code fsError;
+	std::filesystem::create_directories(mRuntimeRoot / "shader_cache", fsError);
+	std::filesystem::create_directories(mPresetRoot, fsError);
+	return true;
+}
+
+bool RuntimeConfigStore::LoadConfig(std::string& error)
+{
+	if (!std::filesystem::exists(mConfigPath))
+		return true;
+
+	std::string configText = ReadTextFile(mConfigPath, error);
+	if (configText.empty())
+		return false;
+
+	JsonValue configJson;
+	if (!ParseJson(configText, configJson, error))
+		return false;
+
+	if (const JsonValue* shaderLibraryValue = configJson.find("shaderLibrary"))
+		mConfig.shaderLibrary = shaderLibraryValue->asString();
+	if (const JsonValue* serverPortValue = configJson.find("serverPort"))
+		mConfig.serverPort = static_cast<unsigned short>(serverPortValue->asNumber(mConfig.serverPort));
+	if (const JsonValue* oscPortValue = configJson.find("oscPort"))
+		mConfig.oscPort = static_cast<unsigned short>(oscPortValue->asNumber(mConfig.oscPort));
+	if (const JsonValue* oscBindAddressValue = configJson.find("oscBindAddress"))
+		mConfig.oscBindAddress = oscBindAddressValue->asString();
+	if (const JsonValue* oscSmoothingValue = configJson.find("oscSmoothing"))
+		mConfig.oscSmoothing = Clamp01(oscSmoothingValue->asNumber(mConfig.oscSmoothing));
+	if (const JsonValue* autoReloadValue = configJson.find("autoReload"))
+		mConfig.autoReload = autoReloadValue->asBoolean(mConfig.autoReload);
+	if (const JsonValue* maxTemporalHistoryFramesValue = configJson.find("maxTemporalHistoryFrames"))
+	{
+		const double configuredValue = maxTemporalHistoryFramesValue->asNumber(static_cast<double>(mConfig.maxTemporalHistoryFrames));
+		mConfig.maxTemporalHistoryFrames = configuredValue <= 0.0 ? 0u : static_cast<unsigned>(configuredValue);
+	}
+	if (const JsonValue* previewFpsValue = configJson.find("previewFps"))
+	{
+		const double configuredValue = previewFpsValue->asNumber(static_cast<double>(mConfig.previewFps));
+		mConfig.previewFps = configuredValue <= 0.0 ? 0u : static_cast<unsigned>(configuredValue);
+	}
+	if (const JsonValue* enableExternalKeyingValue = configJson.find("enableExternalKeying"))
+		mConfig.enableExternalKeying = enableExternalKeyingValue->asBoolean(mConfig.enableExternalKeying);
+	if (const JsonValue* videoFormatValue = configJson.find("videoFormat"))
+	{
+		if (videoFormatValue->isString() && !videoFormatValue->asString().empty())
+		{
+			mConfig.inputVideoFormat = videoFormatValue->asString();
+			mConfig.outputVideoFormat = videoFormatValue->asString();
+		}
+	}
+	if (const JsonValue* frameRateValue = configJson.find("frameRate"))
+	{
+		if (frameRateValue->isString() && !frameRateValue->asString().empty())
+		{
+			mConfig.inputFrameRate = frameRateValue->asString();
+			mConfig.outputFrameRate = frameRateValue->asString();
+		}
+		else if (frameRateValue->isNumber())
+		{
+			std::ostringstream stream;
+			stream << frameRateValue->asNumber();
+			mConfig.inputFrameRate = stream.str();
+			mConfig.outputFrameRate = stream.str();
+		}
+	}
+	if (const JsonValue* inputVideoFormatValue = configJson.find("inputVideoFormat"))
+	{
+		if (inputVideoFormatValue->isString() && !inputVideoFormatValue->asString().empty())
+			mConfig.inputVideoFormat = inputVideoFormatValue->asString();
+	}
+	if (const JsonValue* inputFrameRateValue = configJson.find("inputFrameRate"))
+	{
+		if (inputFrameRateValue->isString() && !inputFrameRateValue->asString().empty())
+			mConfig.inputFrameRate = inputFrameRateValue->asString();
+		else if (inputFrameRateValue->isNumber())
+		{
+			std::ostringstream stream;
+			stream << inputFrameRateValue->asNumber();
+			mConfig.inputFrameRate = stream.str();
+		}
+	}
+	if (const JsonValue* outputVideoFormatValue = configJson.find("outputVideoFormat"))
+	{
+		if (outputVideoFormatValue->isString() && !outputVideoFormatValue->asString().empty())
+			mConfig.outputVideoFormat = outputVideoFormatValue->asString();
+	}
+	if (const JsonValue* outputFrameRateValue = configJson.find("outputFrameRate"))
+	{
+		if (outputFrameRateValue->isString() && !outputFrameRateValue->asString().empty())
+			mConfig.outputFrameRate = outputFrameRateValue->asString();
+		else if (outputFrameRateValue->isNumber())
+		{
+			std::ostringstream stream;
+			stream << outputFrameRateValue->asNumber();
+			mConfig.outputFrameRate = stream.str();
+		}
+	}
+
+	return true;
+}
+
+std::string RuntimeConfigStore::ReadTextFile(const std::filesystem::path& path, std::string& error) const
+{
+	std::ifstream input(path, std::ios::binary);
+	if (!input)
+	{
+		error = "Could not open file: " + path.string();
+		return std::string();
+	}
+
+	std::ostringstream buffer;
+	buffer << input.rdbuf();
+	return buffer.str();
+}
+
+void RuntimeConfigStore::RefreshConfigDependentPaths()
+{
+	mShaderRoot = mRepoRoot / mConfig.shaderLibrary;
+	mWrapperPath = mRuntimeRoot / "shader_cache" / "active_shader_wrapper.slang";
+	mGeneratedGlslPath = mRuntimeRoot / "shader_cache" / "active_shader.raw.frag";
+	mPatchedGlslPath = mRuntimeRoot / "shader_cache" / "active_shader.frag";
+}

apps/LoopThroughWithOpenGLCompositing/runtime/store/RuntimeConfigStore.h

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <filesystem>
+#include <string>
+
+class RuntimeConfigStore
+{
+public:
+	struct AppConfig
+	{
+		std::string shaderLibrary = "shaders";
+		unsigned short serverPort = 8080;
+		unsigned short oscPort = 9000;
+		std::string oscBindAddress = "127.0.0.1";
+		double oscSmoothing = 0.18;
+		bool autoReload = true;
+		unsigned maxTemporalHistoryFrames = 4;
+		unsigned previewFps = 30;
+		bool enableExternalKeying = false;
+		std::string inputVideoFormat = "1080p";
+		std::string inputFrameRate = "59.94";
+		std::string outputVideoFormat = "1080p";
+		std::string outputFrameRate = "59.94";
+	};
+
+	bool Initialize(std::string& error);
+
+	const AppConfig& GetConfig() const;
+	const std::filesystem::path& GetRepoRoot() const;
+	const std::filesystem::path& GetUiRoot() const;
+	const std::filesystem::path& GetDocsRoot() const;
+	const std::filesystem::path& GetShaderRoot() const;
+	const std::filesystem::path& GetRuntimeRoot() const;
+	const std::filesystem::path& GetPresetRoot() const;
+	const std::filesystem::path& GetRuntimeStatePath() const;
+	const std::filesystem::path& GetWrapperPath() const;
+	const std::filesystem::path& GetGeneratedGlslPath() const;
+	const std::filesystem::path& GetPatchedGlslPath() const;
+	void SetBoundControlServerPort(unsigned short port);
+
+private:
+	bool ResolvePaths(std::string& error);
+	bool LoadConfig(std::string& error);
+	std::string ReadTextFile(const std::filesystem::path& path, std::string& error) const;
+	void RefreshConfigDependentPaths();
+
+	AppConfig mConfig;
+	std::filesystem::path mRepoRoot;
+	std::filesystem::path mUiRoot;
+	std::filesystem::path mDocsRoot;
+	std::filesystem::path mShaderRoot;
+	std::filesystem::path mRuntimeRoot;
+	std::filesystem::path mPresetRoot;
+	std::filesystem::path mRuntimeStatePath;
+	std::filesystem::path mConfigPath;
+	std::filesystem::path mWrapperPath;
+	std::filesystem::path mGeneratedGlslPath;
+	std::filesystem::path mPatchedGlslPath;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/store/RuntimeStore.cpp

@@ -0,0 +1,704 @@
+#include "RuntimeStore.h"
+
+#include "RuntimeStatePresenter.h"
+
+#include <cctype>
+#include <fstream>
+#include <mutex>
+#include <random>
+#include <sstream>
+
+namespace
+{
+std::string ToLowerCopy(std::string text)
+{
+	std::transform(text.begin(), text.end(), text.begin(),
+		[](unsigned char ch) { return static_cast<char>(std::tolower(ch)); });
+	return text;
+}
+
+double GenerateStartupRandom()
+{
+	std::random_device randomDevice;
+	std::uniform_real_distribution<double> distribution(0.0, 1.0);
+	return distribution(randomDevice);
+}
+
+std::string PersistenceTargetKindName(PersistenceTargetKind targetKind)
+{
+	switch (targetKind)
+	{
+	case PersistenceTargetKind::RuntimeState:
+		return "runtime-state";
+	case PersistenceTargetKind::StackPreset:
+		return "stack-preset";
+	case PersistenceTargetKind::RuntimeConfig:
+		return "runtime-config";
+	default:
+		return "unknown";
+	}
+}
+
+}
+
+RuntimeStore::RuntimeStore() :
+	mRenderSnapshotBuilder(*this),
+	mReloadRequested(false),
+	mCompileSucceeded(false),
+	mStartupRandom(GenerateStartupRandom()),
+	mServerPort(8080),
+	mAutoReloadEnabled(true),
+	mStartTime(std::chrono::steady_clock::now()),
+	mLastScanTime((std::chrono::steady_clock::time_point::min)())
+{
+	mPersistenceWriter.SetResultCallback([this](const PersistenceWriteResult& result) {
+		mHealthTelemetry.RecordPersistenceWriteResult(
+			result.succeeded,
+			PersistenceTargetKindName(result.targetKind),
+			result.targetPath,
+			result.reason,
+			result.errorMessage,
+			result.newerRequestPending);
+	});
+}
+
+HealthTelemetry& RuntimeStore::GetHealthTelemetry()
+{
+	return mHealthTelemetry;
+}
+
+const HealthTelemetry& RuntimeStore::GetHealthTelemetry() const
+{
+	return mHealthTelemetry;
+}
+
+RenderSnapshotBuilder& RuntimeStore::GetRenderSnapshotBuilder()
+{
+	return mRenderSnapshotBuilder;
+}
+
+const RenderSnapshotBuilder& RuntimeStore::GetRenderSnapshotBuilder() const
+{
+	return mRenderSnapshotBuilder;
+}
+
+bool RuntimeStore::InitializeStore(std::string& error)
+{
+	try
+	{
+		std::lock_guard<std::mutex> lock(mMutex);
+
+		if (!mConfigStore.Initialize(error))
+			return false;
+		if (!LoadPersistentState(error))
+			return false;
+		if (!ScanShaderPackages(error))
+			return false;
+		mCommittedLiveState.NormalizeLayerIds();
+		mCommittedLiveState.EnsureDefaultsForAllLayers(mShaderCatalog);
+		mCommittedLiveState.EnsureDefaultLayer(mShaderCatalog);
+
+		mServerPort = mConfigStore.GetConfig().serverPort;
+		mAutoReloadEnabled = mConfigStore.GetConfig().autoReload;
+		mReloadRequested = true;
+		mCompileMessage = "Waiting for shader compile.";
+		return true;
+	}
+	catch (const std::exception& exception)
+	{
+		error = std::string("RuntimeStore::InitializeStore exception: ") + exception.what();
+		return false;
+	}
+	catch (...)
+	{
+		error = "RuntimeStore::InitializeStore threw a non-standard exception.";
+		return false;
+	}
+}
+
+std::string RuntimeStore::BuildPersistentStateJson() const
+{
+	return RuntimeStatePresenter::BuildRuntimeStateJson(*this);
+}
+
+PersistenceSnapshot RuntimeStore::BuildRuntimeStatePersistenceSnapshot(const PersistenceRequest& request) const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return BuildRuntimeStatePersistenceSnapshotLocked(request);
+}
+
+bool RuntimeStore::RequestPersistence(const PersistenceRequest& request, std::string& error)
+{
+	if (request.targetKind != PersistenceTargetKind::RuntimeState)
+	{
+		error = "Unsupported persistence request target: " + PersistenceTargetKindName(request.targetKind);
+		mHealthTelemetry.RecordPersistenceWriteResult(
+			false,
+			PersistenceTargetKindName(request.targetKind),
+			std::string(),
+			request.reason,
+			error,
+			false);
+		return false;
+	}
+
+	const PersistenceSnapshot snapshot = BuildRuntimeStatePersistenceSnapshot(request);
+	if (mPersistenceWriter.EnqueueSnapshot(snapshot, error))
+		return true;
+
+	mHealthTelemetry.RecordPersistenceWriteResult(
+		false,
+		PersistenceTargetKindName(request.targetKind),
+		snapshot.targetPath.string(),
+		request.reason,
+		error,
+		false);
+	return false;
+}
+
+bool RuntimeStore::FlushPersistenceForShutdown(std::chrono::milliseconds timeout, std::string& error)
+{
+	if (mPersistenceWriter.StopAndFlush(timeout, error))
+		return true;
+
+	mHealthTelemetry.RecordPersistenceWriteResult(
+		false,
+		PersistenceTargetKindName(PersistenceTargetKind::RuntimeState),
+		std::string(),
+		"shutdown-flush",
+		error,
+		true);
+	return false;
+}
+
+PersistenceSnapshot RuntimeStore::BuildRuntimeStatePersistenceSnapshotLocked(const PersistenceRequest& request) const
+{
+	PersistenceSnapshot snapshot;
+	snapshot.targetKind = PersistenceTargetKind::RuntimeState;
+	snapshot.targetPath = mConfigStore.GetRuntimeStatePath();
+	snapshot.contents = SerializeJson(mCommittedLiveState.BuildPersistentStateValue(mShaderCatalog), true);
+	snapshot.reason = request.reason;
+	snapshot.debounceKey = request.debounceKey;
+	snapshot.debounceAllowed = request.debounceAllowed;
+	snapshot.flushRequested = request.flushRequested;
+	snapshot.generation = request.sequence;
+	return snapshot;
+}
+
+bool RuntimeStore::PollStoredFileChanges(bool& registryChanged, bool& reloadRequested, std::string& error)
+{
+	try
+	{
+		std::lock_guard<std::mutex> lock(mMutex);
+		registryChanged = false;
+		reloadRequested = false;
+
+		if (!mAutoReloadEnabled)
+		{
+			reloadRequested = mReloadRequested;
+			return true;
+		}
+
+		const auto now = std::chrono::steady_clock::now();
+		if (mLastScanTime != (std::chrono::steady_clock::time_point::min)() &&
+			std::chrono::duration_cast<std::chrono::milliseconds>(now - mLastScanTime).count() < 250)
+		{
+			reloadRequested = mReloadRequested;
+			return true;
+		}
+
+		mLastScanTime = now;
+
+		std::string scanError;
+		const ShaderPackageCatalog::Snapshot previousCatalog = mShaderCatalog.CaptureSnapshot();
+		if (!ScanShaderPackages(scanError))
+		{
+			error = scanError;
+			return false;
+		}
+
+		registryChanged = mShaderCatalog.HasCatalogChangedSince(previousCatalog);
+
+		mCommittedLiveState.EnsureDefaultsForAllLayers(mShaderCatalog);
+		for (RuntimeStore::LayerPersistentState& layer : mCommittedLiveState.Layers())
+		{
+			const ShaderPackage* active = mShaderCatalog.FindPackage(layer.shaderId);
+			if (!active)
+				continue;
+			if (mShaderCatalog.HasPackageChangedSince(previousCatalog, layer.shaderId))
+				mReloadRequested = true;
+		}
+
+		reloadRequested = mReloadRequested;
+		if (registryChanged || reloadRequested)
+			MarkRenderStateDirtyLocked();
+		return true;
+	}
+	catch (const std::exception& exception)
+	{
+		error = std::string("RuntimeStore::PollStoredFileChanges exception: ") + exception.what();
+		return false;
+	}
+	catch (...)
+	{
+		error = "RuntimeStore::PollStoredFileChanges threw a non-standard exception.";
+		return false;
+	}
+}
+
+bool RuntimeStore::CreateStoredLayer(const std::string& shaderId, std::string& error)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!mCommittedLiveState.CreateLayer(mShaderCatalog, shaderId, error))
+		return false;
+
+	mReloadRequested = true;
+	MarkRenderStateDirtyLocked();
+	return true;
+}
+
+bool RuntimeStore::DeleteStoredLayer(const std::string& layerId, std::string& error)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!mCommittedLiveState.DeleteLayer(layerId, error))
+		return false;
+
+	mReloadRequested = true;
+	MarkRenderStateDirtyLocked();
+	return true;
+}
+
+bool RuntimeStore::MoveStoredLayer(const std::string& layerId, int direction, std::string& error)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	bool shouldMove = false;
+	if (!mCommittedLiveState.ResolveLayerMove(layerId, direction, shouldMove, error))
+		return false;
+	if (!shouldMove)
+		return true;
+
+	if (!mCommittedLiveState.MoveLayer(layerId, direction, error))
+		return false;
+
+	mReloadRequested = true;
+	MarkRenderStateDirtyLocked();
+	return true;
+}
+
+bool RuntimeStore::MoveStoredLayerToIndex(const std::string& layerId, std::size_t targetIndex, std::string& error)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	bool shouldMove = false;
+	if (!mCommittedLiveState.ResolveLayerMoveToIndex(layerId, targetIndex, shouldMove, error))
+		return false;
+	if (!shouldMove)
+		return true;
+
+	if (!mCommittedLiveState.MoveLayerToIndex(layerId, targetIndex, error))
+		return false;
+
+	mReloadRequested = true;
+	MarkRenderStateDirtyLocked();
+	return true;
+}
+
+bool RuntimeStore::SetStoredLayerBypassState(const std::string& layerId, bool bypassed, std::string& error)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!mCommittedLiveState.SetLayerBypassState(layerId, bypassed, error))
+		return false;
+
+	mReloadRequested = true;
+	MarkParameterStateDirtyLocked();
+	return true;
+}
+
+bool RuntimeStore::SetStoredLayerShaderSelection(const std::string& layerId, const std::string& shaderId, std::string& error)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!mCommittedLiveState.SetLayerShaderSelection(mShaderCatalog, layerId, shaderId, error))
+		return false;
+
+	mReloadRequested = true;
+	MarkRenderStateDirtyLocked();
+	return true;
+}
+
+bool RuntimeStore::SetStoredParameterValue(const std::string& layerId, const std::string& parameterId, const ShaderParameterValue& value, bool persistState, std::string& error)
+{
+	(void)persistState;
+	std::lock_guard<std::mutex> lock(mMutex);
+
+	if (!mCommittedLiveState.SetParameterValue(layerId, parameterId, value, error))
+		return false;
+
+	MarkParameterStateDirtyLocked();
+	return true;
+}
+
+bool RuntimeStore::ResetStoredLayerParameterValues(const std::string& layerId, std::string& error)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+
+	if (!mCommittedLiveState.ResetLayerParameterValues(mShaderCatalog, layerId, error))
+		return false;
+
+	MarkParameterStateDirtyLocked();
+	return true;
+}
+
+bool RuntimeStore::SaveStackPresetSnapshot(const std::string& presetName, std::string& error) const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	const std::string safeStem = LayerStackStore::MakeSafePresetFileStem(presetName);
+	if (safeStem.empty())
+	{
+		error = "Preset name must include at least one letter or number.";
+		return false;
+	}
+
+	return mPersistenceWriter.WriteSnapshot(BuildStackPresetPersistenceSnapshot(presetName), error);
+}
+
+bool RuntimeStore::LoadStackPresetSnapshot(const std::string& presetName, std::string& error)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	const std::string safeStem = LayerStackStore::MakeSafePresetFileStem(presetName);
+	if (safeStem.empty())
+	{
+		error = "Preset name must include at least one letter or number.";
+		return false;
+	}
+
+	const std::filesystem::path presetPath = mConfigStore.GetPresetRoot() / (safeStem + ".json");
+	std::string presetText = ReadTextFile(presetPath, error);
+	if (presetText.empty())
+		return false;
+
+	JsonValue root;
+	if (!ParseJson(presetText, root, error))
+		return false;
+
+	if (!mCommittedLiveState.LoadStackPresetValue(mShaderCatalog, root, error))
+		return false;
+
+	mReloadRequested = true;
+	MarkRenderStateDirtyLocked();
+	return true;
+}
+
+bool RuntimeStore::HasStoredLayer(const std::string& layerId) const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mCommittedLiveState.HasLayer(layerId);
+}
+
+bool RuntimeStore::HasStoredShader(const std::string& shaderId) const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mShaderCatalog.HasPackage(shaderId);
+}
+
+bool RuntimeStore::TryGetStoredParameterById(const std::string& layerId, const std::string& parameterId, StoredParameterSnapshot& snapshot, std::string& error) const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+
+	return mCommittedLiveState.TryGetParameterById(mShaderCatalog, layerId, parameterId, snapshot, error);
+}
+
+bool RuntimeStore::TryGetStoredParameterByControlKey(const std::string& layerKey, const std::string& parameterKey, StoredParameterSnapshot& snapshot, std::string& error) const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+
+	return mCommittedLiveState.TryGetParameterByControlKey(mShaderCatalog, layerKey, parameterKey, snapshot, error);
+}
+
+bool RuntimeStore::ResolveStoredLayerMove(const std::string& layerId, int direction, bool& shouldMove, std::string& error) const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mCommittedLiveState.ResolveLayerMove(layerId, direction, shouldMove, error);
+}
+
+bool RuntimeStore::ResolveStoredLayerMoveToIndex(const std::string& layerId, std::size_t targetIndex, bool& shouldMove, std::string& error) const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mCommittedLiveState.ResolveLayerMoveToIndex(layerId, targetIndex, shouldMove, error);
+}
+
+bool RuntimeStore::IsValidStackPresetName(const std::string& presetName) const
+{
+	return !LayerStackStore::MakeSafePresetFileStem(presetName).empty();
+}
+
+double RuntimeStore::GetRuntimeElapsedSeconds() const
+{
+	return std::chrono::duration_cast<std::chrono::duration<double>>(
+		std::chrono::steady_clock::now() - mStartTime).count();
+}
+
+const std::filesystem::path& RuntimeStore::GetRuntimeRepositoryRoot() const
+{
+	return mConfigStore.GetRepoRoot();
+}
+
+const std::filesystem::path& RuntimeStore::GetRuntimeUiRoot() const
+{
+	return mConfigStore.GetUiRoot();
+}
+
+const std::filesystem::path& RuntimeStore::GetRuntimeDocsRoot() const
+{
+	return mConfigStore.GetDocsRoot();
+}
+
+const std::filesystem::path& RuntimeStore::GetRuntimeDataRoot() const
+{
+	return mConfigStore.GetRuntimeRoot();
+}
+
+unsigned short RuntimeStore::GetConfiguredControlServerPort() const
+{
+	return mServerPort;
+}
+
+unsigned short RuntimeStore::GetConfiguredOscPort() const
+{
+	return mConfigStore.GetConfig().oscPort;
+}
+
+const std::string& RuntimeStore::GetConfiguredOscBindAddress() const
+{
+	return mConfigStore.GetConfig().oscBindAddress;
+}
+
+double RuntimeStore::GetConfiguredOscSmoothing() const
+{
+	return mConfigStore.GetConfig().oscSmoothing;
+}
+
+unsigned RuntimeStore::GetConfiguredMaxTemporalHistoryFrames() const
+{
+	return mConfigStore.GetConfig().maxTemporalHistoryFrames;
+}
+
+unsigned RuntimeStore::GetConfiguredPreviewFps() const
+{
+	return mConfigStore.GetConfig().previewFps;
+}
+
+bool RuntimeStore::IsExternalKeyingConfigured() const
+{
+	return mConfigStore.GetConfig().enableExternalKeying;
+}
+
+const std::string& RuntimeStore::GetConfiguredInputVideoFormat() const
+{
+	return mConfigStore.GetConfig().inputVideoFormat;
+}
+
+const std::string& RuntimeStore::GetConfiguredInputFrameRate() const
+{
+	return mConfigStore.GetConfig().inputFrameRate;
+}
+
+const std::string& RuntimeStore::GetConfiguredOutputVideoFormat() const
+{
+	return mConfigStore.GetConfig().outputVideoFormat;
+}
+
+const std::string& RuntimeStore::GetConfiguredOutputFrameRate() const
+{
+	return mConfigStore.GetConfig().outputFrameRate;
+}
+
+void RuntimeStore::SetBoundControlServerPort(unsigned short port)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mServerPort = port;
+	mConfigStore.SetBoundControlServerPort(port);
+}
+
+void RuntimeStore::SetCompileStatus(bool succeeded, const std::string& message)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mCompileSucceeded = succeeded;
+	mCompileMessage = message;
+}
+
+void RuntimeStore::ClearReloadRequest()
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mReloadRequested = false;
+}
+
+bool RuntimeStore::LoadPersistentState(std::string& error)
+{
+	if (!std::filesystem::exists(mConfigStore.GetRuntimeStatePath()))
+		return true;
+
+	std::string stateText = ReadTextFile(mConfigStore.GetRuntimeStatePath(), error);
+	if (stateText.empty())
+		return false;
+
+	JsonValue root;
+	if (!ParseJson(stateText, root, error))
+		return false;
+
+	return mCommittedLiveState.LoadPersistentStateValue(root);
+}
+
+PersistenceSnapshot RuntimeStore::BuildStackPresetPersistenceSnapshot(const std::string& presetName) const
+{
+	const std::string safeStem = LayerStackStore::MakeSafePresetFileStem(presetName);
+
+	PersistenceSnapshot snapshot;
+	snapshot.targetKind = PersistenceTargetKind::StackPreset;
+	snapshot.targetPath = mConfigStore.GetPresetRoot() / (safeStem + ".json");
+	snapshot.contents = SerializeJson(mCommittedLiveState.BuildStackPresetValue(mShaderCatalog, presetName), true);
+	snapshot.reason = "SaveStackPreset";
+	snapshot.debounceKey = "stack-preset:" + safeStem;
+	snapshot.debounceAllowed = false;
+	snapshot.flushRequested = true;
+	snapshot.generation = 0;
+	return snapshot;
+}
+
+bool RuntimeStore::ScanShaderPackages(std::string& error)
+{
+	if (!mShaderCatalog.Scan(mConfigStore.GetShaderRoot(), mConfigStore.GetConfig().maxTemporalHistoryFrames, error))
+		return false;
+
+	mCommittedLiveState.RemoveLayersWithMissingPackages(mShaderCatalog);
+
+	MarkRenderStateDirtyLocked();
+	return true;
+}
+
+std::string RuntimeStore::ReadTextFile(const std::filesystem::path& path, std::string& error) const
+{
+	std::ifstream input(path, std::ios::binary);
+	if (!input)
+	{
+		error = "Could not open file: " + path.string();
+		return std::string();
+	}
+
+	std::ostringstream buffer;
+	buffer << input.rdbuf();
+	return buffer.str();
+}
+
+std::vector<std::string> RuntimeStore::GetStackPresetNamesLocked() const
+{
+	std::vector<std::string> presetNames;
+	std::error_code fsError;
+	if (!std::filesystem::exists(mConfigStore.GetPresetRoot(), fsError))
+		return presetNames;
+
+	for (const auto& entry : std::filesystem::directory_iterator(mConfigStore.GetPresetRoot(), fsError))
+	{
+		if (!entry.is_regular_file())
+			continue;
+		if (ToLowerCopy(entry.path().extension().string()) != ".json")
+			continue;
+		presetNames.push_back(entry.path().stem().string());
+	}
+
+	std::sort(presetNames.begin(), presetNames.end());
+	return presetNames;
+}
+
+bool RuntimeStore::CopyShaderPackageForStoredLayer(const std::string& layerId, ShaderPackage& shaderPackage, std::string& error) const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	const RuntimeStore::LayerPersistentState* layer = mCommittedLiveState.FindLayerById(layerId);
+	if (!layer)
+	{
+		error = "Unknown layer id: " + layerId;
+		return false;
+	}
+
+	if (!mShaderCatalog.CopyPackage(layer->shaderId, shaderPackage))
+	{
+		error = "Unknown shader id: " + layer->shaderId;
+		return false;
+	}
+
+	return true;
+}
+
+ShaderCompilerInputs RuntimeStore::GetShaderCompilerInputs() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	ShaderCompilerInputs inputs;
+	inputs.repoRoot = mConfigStore.GetRepoRoot();
+	inputs.wrapperPath = mConfigStore.GetWrapperPath();
+	inputs.generatedGlslPath = mConfigStore.GetGeneratedGlslPath();
+	inputs.patchedGlslPath = mConfigStore.GetPatchedGlslPath();
+	inputs.maxTemporalHistoryFrames = mConfigStore.GetConfig().maxTemporalHistoryFrames;
+	return inputs;
+}
+
+CommittedLiveStateReadModel RuntimeStore::BuildCommittedLiveStateReadModel() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mCommittedLiveState.BuildReadModel(mShaderCatalog);
+}
+
+RenderSnapshotReadModel RuntimeStore::BuildRenderSnapshotReadModel() const
+{
+	RenderSnapshotReadModel model;
+	model.signalStatus = mHealthTelemetry.GetSignalStatusSnapshot();
+	model.committedLiveState = BuildCommittedLiveStateReadModel();
+	std::lock_guard<std::mutex> lock(mMutex);
+	model.timing.startTime = mStartTime;
+	model.timing.startupRandom = mStartupRandom;
+	return model;
+}
+
+std::vector<RuntimeStore::LayerPersistentState> RuntimeStore::CopyCommittedLiveLayerStates() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mCommittedLiveState.CopyLayerStates();
+}
+
+std::vector<RuntimeStore::LayerPersistentState> RuntimeStore::CopyLayerStates() const
+{
+	return CopyCommittedLiveLayerStates();
+}
+
+RenderTimingSnapshot RuntimeStore::GetRenderTimingSnapshot() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	RenderTimingSnapshot snapshot;
+	snapshot.startTime = mStartTime;
+	snapshot.startupRandom = mStartupRandom;
+	return snapshot;
+}
+
+RuntimeStatePresentationReadModel RuntimeStore::BuildRuntimeStatePresentationReadModel() const
+{
+	RuntimeStatePresentationReadModel model;
+	model.telemetry = mHealthTelemetry.GetSnapshot();
+	std::lock_guard<std::mutex> lock(mMutex);
+	model.config = mConfigStore.GetConfig();
+	model.layerStack = mCommittedLiveState.LayerStack();
+	model.shaderCatalog = mShaderCatalog.CaptureSnapshot();
+	model.packageStatuses = mShaderCatalog.PackageStatuses();
+	model.stackPresetNames = GetStackPresetNamesLocked();
+	model.serverPort = mServerPort;
+	model.autoReloadEnabled = mAutoReloadEnabled;
+	model.compileSucceeded = mCompileSucceeded;
+	model.compileMessage = mCompileMessage;
+	return model;
+}
+
+void RuntimeStore::MarkRenderStateDirtyLocked()
+{
+	mRenderSnapshotBuilder.MarkRenderStateDirty();
+}
+
+void RuntimeStore::MarkParameterStateDirtyLocked()
+{
+	mRenderSnapshotBuilder.MarkParameterStateDirty();
+}

apps/LoopThroughWithOpenGLCompositing/runtime/store/RuntimeStore.h

@@ -0,0 +1,111 @@
+#pragma once
+
+#include "HealthTelemetry.h"
+#include "CommittedLiveState.h"
+#include "LayerStackStore.h"
+#include "PersistenceWriter.h"
+#include "RenderSnapshotBuilder.h"
+#include "RuntimeConfigStore.h"
+#include "RuntimeJson.h"
+#include "RuntimeStoreReadModels.h"
+#include "ShaderPackageCatalog.h"
+#include "ShaderTypes.h"
+
+#include <chrono>
+#include <filesystem>
+#include <mutex>
+#include <string>
+#include <vector>
+
+class RuntimeStore
+{
+public:
+	using StoredParameterSnapshot = LayerStackStore::StoredParameterSnapshot;
+	using LayerPersistentState = LayerStackStore::LayerPersistentState;
+
+	RuntimeStore();
+	HealthTelemetry& GetHealthTelemetry();
+	const HealthTelemetry& GetHealthTelemetry() const;
+	RenderSnapshotBuilder& GetRenderSnapshotBuilder();
+	const RenderSnapshotBuilder& GetRenderSnapshotBuilder() const;
+
+	bool InitializeStore(std::string& error);
+	std::string BuildPersistentStateJson() const;
+	PersistenceSnapshot BuildRuntimeStatePersistenceSnapshot(const PersistenceRequest& request) const;
+	bool RequestPersistence(const PersistenceRequest& request, std::string& error);
+	bool FlushPersistenceForShutdown(std::chrono::milliseconds timeout, std::string& error);
+	bool PollStoredFileChanges(bool& registryChanged, bool& reloadRequested, std::string& error);
+
+	bool CreateStoredLayer(const std::string& shaderId, std::string& error);
+	bool DeleteStoredLayer(const std::string& layerId, std::string& error);
+	bool MoveStoredLayer(const std::string& layerId, int direction, std::string& error);
+	bool MoveStoredLayerToIndex(const std::string& layerId, std::size_t targetIndex, std::string& error);
+	bool SetStoredLayerBypassState(const std::string& layerId, bool bypassed, std::string& error);
+	bool SetStoredLayerShaderSelection(const std::string& layerId, const std::string& shaderId, std::string& error);
+	bool SetStoredParameterValue(const std::string& layerId, const std::string& parameterId, const ShaderParameterValue& value, bool persistState, std::string& error);
+	bool ResetStoredLayerParameterValues(const std::string& layerId, std::string& error);
+	bool SaveStackPresetSnapshot(const std::string& presetName, std::string& error) const;
+	bool LoadStackPresetSnapshot(const std::string& presetName, std::string& error);
+	bool HasStoredLayer(const std::string& layerId) const;
+	bool HasStoredShader(const std::string& shaderId) const;
+	bool TryGetStoredParameterById(const std::string& layerId, const std::string& parameterId, StoredParameterSnapshot& snapshot, std::string& error) const;
+	bool TryGetStoredParameterByControlKey(const std::string& layerKey, const std::string& parameterKey, StoredParameterSnapshot& snapshot, std::string& error) const;
+	bool ResolveStoredLayerMove(const std::string& layerId, int direction, bool& shouldMove, std::string& error) const;
+	bool ResolveStoredLayerMoveToIndex(const std::string& layerId, std::size_t targetIndex, bool& shouldMove, std::string& error) const;
+	bool IsValidStackPresetName(const std::string& presetName) const;
+	double GetRuntimeElapsedSeconds() const;
+
+	const std::filesystem::path& GetRuntimeRepositoryRoot() const;
+	const std::filesystem::path& GetRuntimeUiRoot() const;
+	const std::filesystem::path& GetRuntimeDocsRoot() const;
+	const std::filesystem::path& GetRuntimeDataRoot() const;
+	unsigned short GetConfiguredControlServerPort() const;
+	unsigned short GetConfiguredOscPort() const;
+	const std::string& GetConfiguredOscBindAddress() const;
+	double GetConfiguredOscSmoothing() const;
+	unsigned GetConfiguredMaxTemporalHistoryFrames() const;
+	unsigned GetConfiguredPreviewFps() const;
+	bool IsExternalKeyingConfigured() const;
+	const std::string& GetConfiguredInputVideoFormat() const;
+	const std::string& GetConfiguredInputFrameRate() const;
+	const std::string& GetConfiguredOutputVideoFormat() const;
+	const std::string& GetConfiguredOutputFrameRate() const;
+	void SetBoundControlServerPort(unsigned short port);
+
+	void SetCompileStatus(bool succeeded, const std::string& message);
+	void ClearReloadRequest();
+	bool CopyShaderPackageForStoredLayer(const std::string& layerId, ShaderPackage& shaderPackage, std::string& error) const;
+	::ShaderCompilerInputs GetShaderCompilerInputs() const;
+	::CommittedLiveStateReadModel BuildCommittedLiveStateReadModel() const;
+	::RenderSnapshotReadModel BuildRenderSnapshotReadModel() const;
+	std::vector<LayerPersistentState> CopyCommittedLiveLayerStates() const;
+	std::vector<LayerPersistentState> CopyLayerStates() const;
+	::RenderTimingSnapshot GetRenderTimingSnapshot() const;
+	::RuntimeStatePresentationReadModel BuildRuntimeStatePresentationReadModel() const;
+
+private:
+	bool LoadPersistentState(std::string& error);
+	PersistenceSnapshot BuildRuntimeStatePersistenceSnapshotLocked(const PersistenceRequest& request) const;
+	PersistenceSnapshot BuildStackPresetPersistenceSnapshot(const std::string& presetName) const;
+	bool ScanShaderPackages(std::string& error);
+	std::string ReadTextFile(const std::filesystem::path& path, std::string& error) const;
+	std::vector<std::string> GetStackPresetNamesLocked() const;
+	void MarkRenderStateDirtyLocked();
+	void MarkParameterStateDirtyLocked();
+
+	RenderSnapshotBuilder mRenderSnapshotBuilder;
+	RuntimeConfigStore mConfigStore;
+	ShaderPackageCatalog mShaderCatalog;
+	CommittedLiveState mCommittedLiveState;
+	HealthTelemetry mHealthTelemetry;
+	mutable PersistenceWriter mPersistenceWriter;
+	mutable std::mutex mMutex;
+	bool mReloadRequested;
+	bool mCompileSucceeded;
+	std::string mCompileMessage;
+	double mStartupRandom;
+	unsigned short mServerPort;
+	bool mAutoReloadEnabled;
+	std::chrono::steady_clock::time_point mStartTime;
+	std::chrono::steady_clock::time_point mLastScanTime;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/store/RuntimeStoreReadModels.h

@@ -0,0 +1,55 @@
+#pragma once
+
+#include "HealthTelemetry.h"
+#include "LayerStackStore.h"
+#include "RuntimeConfigStore.h"
+#include "ShaderPackageCatalog.h"
+#include "ShaderTypes.h"
+
+#include <chrono>
+#include <filesystem>
+#include <map>
+#include <string>
+#include <vector>
+
+struct ShaderCompilerInputs
+{
+	std::filesystem::path repoRoot;
+	std::filesystem::path wrapperPath;
+	std::filesystem::path generatedGlslPath;
+	std::filesystem::path patchedGlslPath;
+	unsigned maxTemporalHistoryFrames = 0;
+};
+
+struct RenderTimingSnapshot
+{
+	std::chrono::steady_clock::time_point startTime;
+	double startupRandom = 0.0;
+};
+
+struct CommittedLiveStateReadModel
+{
+	std::vector<LayerStackStore::LayerPersistentState> layers;
+	std::map<std::string, ShaderPackage> packagesById;
+};
+
+struct RenderSnapshotReadModel
+{
+	CommittedLiveStateReadModel committedLiveState;
+	HealthTelemetry::SignalStatusSnapshot signalStatus;
+	RenderTimingSnapshot timing;
+};
+
+struct RuntimeStatePresentationReadModel
+{
+	RuntimeConfigStore::AppConfig config;
+	HealthTelemetry::Snapshot telemetry;
+	LayerStackStore layerStack;
+	ShaderPackageCatalog::Snapshot shaderCatalog;
+	std::vector<ShaderPackageStatus> packageStatuses;
+	std::vector<std::string> stackPresetNames;
+	unsigned short serverPort = 0;
+	bool autoReloadEnabled = false;
+	bool compileSucceeded = false;
+	std::string compileMessage;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/store/ShaderPackageCatalog.cpp

@@ -0,0 +1,127 @@
+#include "ShaderPackageCatalog.h"
+
+#include "ShaderPackageRegistry.h"
+
+bool ShaderPackageCatalog::Scan(const std::filesystem::path& shaderRoot, unsigned maxTemporalHistoryFrames, std::string& error)
+{
+	std::map<std::string, ShaderPackage> packagesById;
+	std::vector<std::string> packageOrder;
+	std::vector<ShaderPackageStatus> packageStatuses;
+
+	ShaderPackageRegistry registry(maxTemporalHistoryFrames);
+	if (!registry.Scan(shaderRoot, packagesById, packageOrder, packageStatuses, error))
+		return false;
+
+	mPackagesById.swap(packagesById);
+	mPackageOrder.swap(packageOrder);
+	mPackageStatuses.swap(packageStatuses);
+	return true;
+}
+
+ShaderPackageCatalog::Snapshot ShaderPackageCatalog::CaptureSnapshot() const
+{
+	Snapshot snapshot;
+	snapshot.packagesById = mPackagesById;
+	snapshot.packageOrder = mPackageOrder;
+	return snapshot;
+}
+
+bool ShaderPackageCatalog::HasCatalogChangedSince(const Snapshot& snapshot) const
+{
+	if (snapshot.packageOrder != mPackageOrder || snapshot.packagesById.size() != mPackagesById.size())
+		return true;
+
+	for (const auto& item : mPackagesById)
+	{
+		auto previous = snapshot.packagesById.find(item.first);
+		if (previous == snapshot.packagesById.end() || !PackagesEquivalent(previous->second, item.second))
+			return true;
+	}
+
+	return false;
+}
+
+bool ShaderPackageCatalog::HasPackageChangedSince(const Snapshot& snapshot, const std::string& shaderId) const
+{
+	auto previous = snapshot.packagesById.find(shaderId);
+	auto current = mPackagesById.find(shaderId);
+	if (previous == snapshot.packagesById.end() || current == mPackagesById.end())
+		return previous != snapshot.packagesById.end() || current != mPackagesById.end();
+
+	return !PackagesEquivalent(previous->second, current->second);
+}
+
+bool ShaderPackageCatalog::HasPackage(const std::string& shaderId) const
+{
+	return mPackagesById.find(shaderId) != mPackagesById.end();
+}
+
+const ShaderPackage* ShaderPackageCatalog::FindPackage(const std::string& shaderId) const
+{
+	auto it = mPackagesById.find(shaderId);
+	return it == mPackagesById.end() ? nullptr : &it->second;
+}
+
+bool ShaderPackageCatalog::CopyPackage(const std::string& shaderId, ShaderPackage& shaderPackage) const
+{
+	const ShaderPackage* package = FindPackage(shaderId);
+	if (!package)
+		return false;
+
+	shaderPackage = *package;
+	return true;
+}
+
+const std::vector<std::string>& ShaderPackageCatalog::PackageOrder() const
+{
+	return mPackageOrder;
+}
+
+const std::vector<ShaderPackageStatus>& ShaderPackageCatalog::PackageStatuses() const
+{
+	return mPackageStatuses;
+}
+
+bool ShaderPackageCatalog::PackagesEquivalent(const ShaderPackage& left, const ShaderPackage& right)
+{
+	return left.shaderWriteTime == right.shaderWriteTime &&
+		left.manifestWriteTime == right.manifestWriteTime &&
+		TextureAssetsEqual(left.textureAssets, right.textureAssets) &&
+		FontAssetsEqual(left.fontAssets, right.fontAssets);
+}
+
+bool ShaderPackageCatalog::TextureAssetsEqual(const std::vector<ShaderTextureAsset>& left, const std::vector<ShaderTextureAsset>& right)
+{
+	if (left.size() != right.size())
+		return false;
+
+	for (std::size_t index = 0; index < left.size(); ++index)
+	{
+		if (left[index].id != right[index].id ||
+			left[index].path != right[index].path ||
+			left[index].writeTime != right[index].writeTime)
+		{
+			return false;
+		}
+	}
+
+	return true;
+}
+
+bool ShaderPackageCatalog::FontAssetsEqual(const std::vector<ShaderFontAsset>& left, const std::vector<ShaderFontAsset>& right)
+{
+	if (left.size() != right.size())
+		return false;
+
+	for (std::size_t index = 0; index < left.size(); ++index)
+	{
+		if (left[index].id != right[index].id ||
+			left[index].path != right[index].path ||
+			left[index].writeTime != right[index].writeTime)
+		{
+			return false;
+		}
+	}
+
+	return true;
+}

apps/LoopThroughWithOpenGLCompositing/runtime/store/ShaderPackageCatalog.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include "ShaderTypes.h"
+
+#include <filesystem>
+#include <map>
+#include <string>
+#include <vector>
+
+class ShaderPackageCatalog
+{
+public:
+	struct Snapshot
+	{
+		std::map<std::string, ShaderPackage> packagesById;
+		std::vector<std::string> packageOrder;
+	};
+
+	bool Scan(const std::filesystem::path& shaderRoot, unsigned maxTemporalHistoryFrames, std::string& error);
+	Snapshot CaptureSnapshot() const;
+	bool HasCatalogChangedSince(const Snapshot& snapshot) const;
+	bool HasPackageChangedSince(const Snapshot& snapshot, const std::string& shaderId) const;
+	bool HasPackage(const std::string& shaderId) const;
+	const ShaderPackage* FindPackage(const std::string& shaderId) const;
+	bool CopyPackage(const std::string& shaderId, ShaderPackage& shaderPackage) const;
+	const std::vector<std::string>& PackageOrder() const;
+	const std::vector<ShaderPackageStatus>& PackageStatuses() const;
+
+private:
+	static bool PackagesEquivalent(const ShaderPackage& left, const ShaderPackage& right);
+	static bool TextureAssetsEqual(const std::vector<ShaderTextureAsset>& left, const std::vector<ShaderTextureAsset>& right);
+	static bool FontAssetsEqual(const std::vector<ShaderFontAsset>& left, const std::vector<ShaderFontAsset>& right);
+
+	std::map<std::string, ShaderPackage> mPackagesById;
+	std::vector<std::string> mPackageOrder;
+	std::vector<ShaderPackageStatus> mPackageStatuses;
+};

apps/LoopThroughWithOpenGLCompositing/runtime/telemetry/HealthTelemetry.cpp

@@ -0,0 +1,500 @@
+#include "stdafx.h"
+#include "HealthTelemetry.h"
+
+void HealthTelemetry::ReportSignalStatus(bool hasSignal, unsigned width, unsigned height, const std::string& modeName)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mSignalStatus.hasSignal = hasSignal;
+	mSignalStatus.width = width;
+	mSignalStatus.height = height;
+	mSignalStatus.modeName = modeName;
+}
+
+bool HealthTelemetry::TryReportSignalStatus(bool hasSignal, unsigned width, unsigned height, const std::string& modeName)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	mSignalStatus.hasSignal = hasSignal;
+	mSignalStatus.width = width;
+	mSignalStatus.height = height;
+	mSignalStatus.modeName = modeName;
+	return true;
+}
+
+void HealthTelemetry::ReportVideoIOStatus(const std::string& backendName, const std::string& modelName,
+	bool supportsInternalKeying, bool supportsExternalKeying, bool keyerInterfaceAvailable,
+	bool externalKeyingRequested, bool externalKeyingActive, const std::string& statusMessage)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mVideoIOStatus.backendName = backendName;
+	mVideoIOStatus.modelName = modelName;
+	mVideoIOStatus.supportsInternalKeying = supportsInternalKeying;
+	mVideoIOStatus.supportsExternalKeying = supportsExternalKeying;
+	mVideoIOStatus.keyerInterfaceAvailable = keyerInterfaceAvailable;
+	mVideoIOStatus.externalKeyingRequested = externalKeyingRequested;
+	mVideoIOStatus.externalKeyingActive = externalKeyingActive;
+	mVideoIOStatus.statusMessage = statusMessage;
+}
+
+bool HealthTelemetry::TryReportVideoIOStatus(const std::string& backendName, const std::string& modelName,
+	bool supportsInternalKeying, bool supportsExternalKeying, bool keyerInterfaceAvailable,
+	bool externalKeyingRequested, bool externalKeyingActive, const std::string& statusMessage)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	mVideoIOStatus.backendName = backendName;
+	mVideoIOStatus.modelName = modelName;
+	mVideoIOStatus.supportsInternalKeying = supportsInternalKeying;
+	mVideoIOStatus.supportsExternalKeying = supportsExternalKeying;
+	mVideoIOStatus.keyerInterfaceAvailable = keyerInterfaceAvailable;
+	mVideoIOStatus.externalKeyingRequested = externalKeyingRequested;
+	mVideoIOStatus.externalKeyingActive = externalKeyingActive;
+	mVideoIOStatus.statusMessage = statusMessage;
+	return true;
+}
+
+void HealthTelemetry::RecordPerformanceStats(double frameBudgetMilliseconds, double renderMilliseconds)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mPerformance.frameBudgetMilliseconds = std::max(frameBudgetMilliseconds, 0.0);
+	mPerformance.renderMilliseconds = std::max(renderMilliseconds, 0.0);
+	if (mPerformance.smoothedRenderMilliseconds <= 0.0)
+		mPerformance.smoothedRenderMilliseconds = mPerformance.renderMilliseconds;
+	else
+		mPerformance.smoothedRenderMilliseconds = mPerformance.smoothedRenderMilliseconds * 0.9 + mPerformance.renderMilliseconds * 0.1;
+}
+
+bool HealthTelemetry::TryRecordPerformanceStats(double frameBudgetMilliseconds, double renderMilliseconds)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	mPerformance.frameBudgetMilliseconds = std::max(frameBudgetMilliseconds, 0.0);
+	mPerformance.renderMilliseconds = std::max(renderMilliseconds, 0.0);
+	if (mPerformance.smoothedRenderMilliseconds <= 0.0)
+		mPerformance.smoothedRenderMilliseconds = mPerformance.renderMilliseconds;
+	else
+		mPerformance.smoothedRenderMilliseconds = mPerformance.smoothedRenderMilliseconds * 0.9 + mPerformance.renderMilliseconds * 0.1;
+	return true;
+}
+
+void HealthTelemetry::RecordFramePacingStats(double completionIntervalMilliseconds, double smoothedCompletionIntervalMilliseconds,
+	double maxCompletionIntervalMilliseconds, uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mPerformance.completionIntervalMilliseconds = std::max(completionIntervalMilliseconds, 0.0);
+	mPerformance.smoothedCompletionIntervalMilliseconds = std::max(smoothedCompletionIntervalMilliseconds, 0.0);
+	mPerformance.maxCompletionIntervalMilliseconds = std::max(maxCompletionIntervalMilliseconds, 0.0);
+	mPerformance.lateFrameCount = lateFrameCount;
+	mPerformance.droppedFrameCount = droppedFrameCount;
+	mPerformance.flushedFrameCount = flushedFrameCount;
+}
+
+bool HealthTelemetry::TryRecordFramePacingStats(double completionIntervalMilliseconds, double smoothedCompletionIntervalMilliseconds,
+	double maxCompletionIntervalMilliseconds, uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	mPerformance.completionIntervalMilliseconds = std::max(completionIntervalMilliseconds, 0.0);
+	mPerformance.smoothedCompletionIntervalMilliseconds = std::max(smoothedCompletionIntervalMilliseconds, 0.0);
+	mPerformance.maxCompletionIntervalMilliseconds = std::max(maxCompletionIntervalMilliseconds, 0.0);
+	mPerformance.lateFrameCount = lateFrameCount;
+	mPerformance.droppedFrameCount = droppedFrameCount;
+	mPerformance.flushedFrameCount = flushedFrameCount;
+	return true;
+}
+
+void HealthTelemetry::RecordRuntimeEventQueueMetrics(const std::string& queueName, std::size_t depth, std::size_t capacity,
+	uint64_t droppedCount, double oldestEventAgeMilliseconds)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mRuntimeEvents.queue.queueName = queueName;
+	mRuntimeEvents.queue.depth = depth;
+	mRuntimeEvents.queue.capacity = capacity;
+	mRuntimeEvents.queue.droppedCount = droppedCount;
+	mRuntimeEvents.queue.oldestEventAgeMilliseconds = std::max(oldestEventAgeMilliseconds, 0.0);
+}
+
+bool HealthTelemetry::TryRecordRuntimeEventQueueMetrics(const std::string& queueName, std::size_t depth, std::size_t capacity,
+	uint64_t droppedCount, double oldestEventAgeMilliseconds)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	mRuntimeEvents.queue.queueName = queueName;
+	mRuntimeEvents.queue.depth = depth;
+	mRuntimeEvents.queue.capacity = capacity;
+	mRuntimeEvents.queue.droppedCount = droppedCount;
+	mRuntimeEvents.queue.oldestEventAgeMilliseconds = std::max(oldestEventAgeMilliseconds, 0.0);
+	return true;
+}
+
+void HealthTelemetry::RecordRuntimeEventDispatchStats(std::size_t dispatchedEvents, std::size_t handlerInvocations,
+	std::size_t handlerFailures, double dispatchDurationMilliseconds)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	++mRuntimeEvents.dispatch.dispatchCallCount;
+	mRuntimeEvents.dispatch.dispatchedEventCount += static_cast<uint64_t>(dispatchedEvents);
+	mRuntimeEvents.dispatch.handlerInvocationCount += static_cast<uint64_t>(handlerInvocations);
+	mRuntimeEvents.dispatch.handlerFailureCount += static_cast<uint64_t>(handlerFailures);
+	mRuntimeEvents.dispatch.lastDispatchDurationMilliseconds = std::max(dispatchDurationMilliseconds, 0.0);
+	mRuntimeEvents.dispatch.maxDispatchDurationMilliseconds = std::max(
+		mRuntimeEvents.dispatch.maxDispatchDurationMilliseconds,
+		mRuntimeEvents.dispatch.lastDispatchDurationMilliseconds);
+}
+
+bool HealthTelemetry::TryRecordRuntimeEventDispatchStats(std::size_t dispatchedEvents, std::size_t handlerInvocations,
+	std::size_t handlerFailures, double dispatchDurationMilliseconds)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	++mRuntimeEvents.dispatch.dispatchCallCount;
+	mRuntimeEvents.dispatch.dispatchedEventCount += static_cast<uint64_t>(dispatchedEvents);
+	mRuntimeEvents.dispatch.handlerInvocationCount += static_cast<uint64_t>(handlerInvocations);
+	mRuntimeEvents.dispatch.handlerFailureCount += static_cast<uint64_t>(handlerFailures);
+	mRuntimeEvents.dispatch.lastDispatchDurationMilliseconds = std::max(dispatchDurationMilliseconds, 0.0);
+	mRuntimeEvents.dispatch.maxDispatchDurationMilliseconds = std::max(
+		mRuntimeEvents.dispatch.maxDispatchDurationMilliseconds,
+		mRuntimeEvents.dispatch.lastDispatchDurationMilliseconds);
+	return true;
+}
+
+void HealthTelemetry::RecordPersistenceWriteResult(bool succeeded, const std::string& targetKind, const std::string& targetPath,
+	const std::string& reason, const std::string& errorMessage, bool newerRequestPending)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (succeeded)
+		++mPersistence.writeSuccessCount;
+	else
+		++mPersistence.writeFailureCount;
+	mPersistence.lastWriteSucceeded = succeeded;
+	mPersistence.unsavedChanges = !succeeded || newerRequestPending;
+	mPersistence.newerRequestPending = newerRequestPending;
+	mPersistence.lastTargetKind = targetKind;
+	mPersistence.lastTargetPath = targetPath;
+	mPersistence.lastReason = reason;
+	mPersistence.lastErrorMessage = errorMessage;
+}
+
+bool HealthTelemetry::TryRecordPersistenceWriteResult(bool succeeded, const std::string& targetKind, const std::string& targetPath,
+	const std::string& reason, const std::string& errorMessage, bool newerRequestPending)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	if (succeeded)
+		++mPersistence.writeSuccessCount;
+	else
+		++mPersistence.writeFailureCount;
+	mPersistence.lastWriteSucceeded = succeeded;
+	mPersistence.unsavedChanges = !succeeded || newerRequestPending;
+	mPersistence.newerRequestPending = newerRequestPending;
+	mPersistence.lastTargetKind = targetKind;
+	mPersistence.lastTargetPath = targetPath;
+	mPersistence.lastReason = reason;
+	mPersistence.lastErrorMessage = errorMessage;
+	return true;
+}
+
+void HealthTelemetry::RecordBackendPlayoutHealth(const std::string& lifecycleState, const std::string& completionResult,
+	std::size_t readyQueueDepth, std::size_t readyQueueCapacity, uint64_t readyQueuePushedCount,
+	std::size_t minReadyQueueDepth, std::size_t maxReadyQueueDepth, uint64_t readyQueueZeroDepthCount,
+	uint64_t readyQueuePoppedCount, uint64_t readyQueueDroppedCount, uint64_t readyQueueUnderrunCount,
+	double outputRenderMilliseconds, double smoothedOutputRenderMilliseconds, double maxOutputRenderMilliseconds,
+	double outputFrameAcquireMilliseconds, double outputFrameRenderRequestMilliseconds, double outputFrameEndAccessMilliseconds,
+	uint64_t completedFrameIndex, uint64_t scheduledFrameIndex, uint64_t scheduledLeadFrames,
+	uint64_t measuredLagFrames, uint64_t catchUpFrames, uint64_t lateStreak, uint64_t dropStreak,
+	uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount,
+	bool degraded, const std::string& statusMessage)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mBackendPlayout.lifecycleState = lifecycleState;
+	mBackendPlayout.completionResult = completionResult;
+	mBackendPlayout.readyQueueDepth = readyQueueDepth;
+	mBackendPlayout.readyQueueCapacity = readyQueueCapacity;
+	mBackendPlayout.minReadyQueueDepth = minReadyQueueDepth;
+	mBackendPlayout.maxReadyQueueDepth = maxReadyQueueDepth;
+	mBackendPlayout.readyQueueZeroDepthCount = readyQueueZeroDepthCount;
+	mBackendPlayout.readyQueuePushedCount = readyQueuePushedCount;
+	mBackendPlayout.readyQueuePoppedCount = readyQueuePoppedCount;
+	mBackendPlayout.readyQueueDroppedCount = readyQueueDroppedCount;
+	mBackendPlayout.readyQueueUnderrunCount = readyQueueUnderrunCount;
+	mBackendPlayout.outputRenderMilliseconds = std::max(outputRenderMilliseconds, 0.0);
+	mBackendPlayout.smoothedOutputRenderMilliseconds = std::max(smoothedOutputRenderMilliseconds, 0.0);
+	mBackendPlayout.maxOutputRenderMilliseconds = std::max(maxOutputRenderMilliseconds, 0.0);
+	mBackendPlayout.outputFrameAcquireMilliseconds = std::max(outputFrameAcquireMilliseconds, 0.0);
+	mBackendPlayout.outputFrameRenderRequestMilliseconds = std::max(outputFrameRenderRequestMilliseconds, 0.0);
+	mBackendPlayout.outputFrameEndAccessMilliseconds = std::max(outputFrameEndAccessMilliseconds, 0.0);
+	mBackendPlayout.completedFrameIndex = completedFrameIndex;
+	mBackendPlayout.scheduledFrameIndex = scheduledFrameIndex;
+	mBackendPlayout.scheduledLeadFrames = scheduledLeadFrames;
+	mBackendPlayout.measuredLagFrames = measuredLagFrames;
+	mBackendPlayout.catchUpFrames = catchUpFrames;
+	mBackendPlayout.lateStreak = lateStreak;
+	mBackendPlayout.dropStreak = dropStreak;
+	mBackendPlayout.lateFrameCount = lateFrameCount;
+	mBackendPlayout.droppedFrameCount = droppedFrameCount;
+	mBackendPlayout.flushedFrameCount = flushedFrameCount;
+	mBackendPlayout.degraded = degraded;
+	mBackendPlayout.statusMessage = statusMessage;
+}
+
+bool HealthTelemetry::TryRecordBackendPlayoutHealth(const std::string& lifecycleState, const std::string& completionResult,
+	std::size_t readyQueueDepth, std::size_t readyQueueCapacity, uint64_t readyQueuePushedCount,
+	std::size_t minReadyQueueDepth, std::size_t maxReadyQueueDepth, uint64_t readyQueueZeroDepthCount,
+	uint64_t readyQueuePoppedCount, uint64_t readyQueueDroppedCount, uint64_t readyQueueUnderrunCount,
+	double outputRenderMilliseconds, double smoothedOutputRenderMilliseconds, double maxOutputRenderMilliseconds,
+	double outputFrameAcquireMilliseconds, double outputFrameRenderRequestMilliseconds, double outputFrameEndAccessMilliseconds,
+	uint64_t completedFrameIndex, uint64_t scheduledFrameIndex, uint64_t scheduledLeadFrames,
+	uint64_t measuredLagFrames, uint64_t catchUpFrames, uint64_t lateStreak, uint64_t dropStreak,
+	uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount,
+	bool degraded, const std::string& statusMessage)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	mBackendPlayout.lifecycleState = lifecycleState;
+	mBackendPlayout.completionResult = completionResult;
+	mBackendPlayout.readyQueueDepth = readyQueueDepth;
+	mBackendPlayout.readyQueueCapacity = readyQueueCapacity;
+	mBackendPlayout.minReadyQueueDepth = minReadyQueueDepth;
+	mBackendPlayout.maxReadyQueueDepth = maxReadyQueueDepth;
+	mBackendPlayout.readyQueueZeroDepthCount = readyQueueZeroDepthCount;
+	mBackendPlayout.readyQueuePushedCount = readyQueuePushedCount;
+	mBackendPlayout.readyQueuePoppedCount = readyQueuePoppedCount;
+	mBackendPlayout.readyQueueDroppedCount = readyQueueDroppedCount;
+	mBackendPlayout.readyQueueUnderrunCount = readyQueueUnderrunCount;
+	mBackendPlayout.outputRenderMilliseconds = std::max(outputRenderMilliseconds, 0.0);
+	mBackendPlayout.smoothedOutputRenderMilliseconds = std::max(smoothedOutputRenderMilliseconds, 0.0);
+	mBackendPlayout.maxOutputRenderMilliseconds = std::max(maxOutputRenderMilliseconds, 0.0);
+	mBackendPlayout.outputFrameAcquireMilliseconds = std::max(outputFrameAcquireMilliseconds, 0.0);
+	mBackendPlayout.outputFrameRenderRequestMilliseconds = std::max(outputFrameRenderRequestMilliseconds, 0.0);
+	mBackendPlayout.outputFrameEndAccessMilliseconds = std::max(outputFrameEndAccessMilliseconds, 0.0);
+	mBackendPlayout.completedFrameIndex = completedFrameIndex;
+	mBackendPlayout.scheduledFrameIndex = scheduledFrameIndex;
+	mBackendPlayout.scheduledLeadFrames = scheduledLeadFrames;
+	mBackendPlayout.measuredLagFrames = measuredLagFrames;
+	mBackendPlayout.catchUpFrames = catchUpFrames;
+	mBackendPlayout.lateStreak = lateStreak;
+	mBackendPlayout.dropStreak = dropStreak;
+	mBackendPlayout.lateFrameCount = lateFrameCount;
+	mBackendPlayout.droppedFrameCount = droppedFrameCount;
+	mBackendPlayout.flushedFrameCount = flushedFrameCount;
+	mBackendPlayout.degraded = degraded;
+	mBackendPlayout.statusMessage = statusMessage;
+	return true;
+}
+
+void HealthTelemetry::RecordOutputRenderQueueWait(double queueWaitMilliseconds)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mBackendPlayout.outputRenderQueueWaitMilliseconds = std::max(queueWaitMilliseconds, 0.0);
+}
+
+bool HealthTelemetry::TryRecordOutputRenderQueueWait(double queueWaitMilliseconds)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	mBackendPlayout.outputRenderQueueWaitMilliseconds = std::max(queueWaitMilliseconds, 0.0);
+	return true;
+}
+
+void HealthTelemetry::RecordSystemMemoryPlayoutStats(std::size_t freeFrameCount, std::size_t readyFrameCount,
+	std::size_t scheduledFrameCount, uint64_t underrunCount, uint64_t repeatCount, uint64_t dropCount,
+	double frameAgeAtScheduleMilliseconds, double frameAgeAtCompletionMilliseconds)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mBackendPlayout.systemFramePoolFree = freeFrameCount;
+	mBackendPlayout.systemFramePoolReady = readyFrameCount;
+	mBackendPlayout.systemFramePoolScheduled = scheduledFrameCount;
+	mBackendPlayout.systemFrameUnderrunCount = underrunCount;
+	mBackendPlayout.systemFrameRepeatCount = repeatCount;
+	mBackendPlayout.systemFrameDropCount = dropCount;
+	mBackendPlayout.systemFrameAgeAtScheduleMilliseconds = std::max(frameAgeAtScheduleMilliseconds, 0.0);
+	mBackendPlayout.systemFrameAgeAtCompletionMilliseconds = std::max(frameAgeAtCompletionMilliseconds, 0.0);
+}
+
+bool HealthTelemetry::TryRecordSystemMemoryPlayoutStats(std::size_t freeFrameCount, std::size_t readyFrameCount,
+	std::size_t scheduledFrameCount, uint64_t underrunCount, uint64_t repeatCount, uint64_t dropCount,
+	double frameAgeAtScheduleMilliseconds, double frameAgeAtCompletionMilliseconds)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	mBackendPlayout.systemFramePoolFree = freeFrameCount;
+	mBackendPlayout.systemFramePoolReady = readyFrameCount;
+	mBackendPlayout.systemFramePoolScheduled = scheduledFrameCount;
+	mBackendPlayout.systemFrameUnderrunCount = underrunCount;
+	mBackendPlayout.systemFrameRepeatCount = repeatCount;
+	mBackendPlayout.systemFrameDropCount = dropCount;
+	mBackendPlayout.systemFrameAgeAtScheduleMilliseconds = std::max(frameAgeAtScheduleMilliseconds, 0.0);
+	mBackendPlayout.systemFrameAgeAtCompletionMilliseconds = std::max(frameAgeAtCompletionMilliseconds, 0.0);
+	return true;
+}
+
+void HealthTelemetry::RecordDeckLinkBufferTelemetry(bool actualBufferedFramesAvailable, uint64_t actualBufferedFrames,
+	std::size_t targetBufferedFrames, double scheduleCallMilliseconds, uint64_t scheduleFailureCount)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mBackendPlayout.actualDeckLinkBufferedFramesAvailable = actualBufferedFramesAvailable;
+	mBackendPlayout.actualDeckLinkBufferedFrames = actualBufferedFramesAvailable ? actualBufferedFrames : 0;
+	mBackendPlayout.targetDeckLinkBufferedFrames = targetBufferedFrames;
+	mBackendPlayout.deckLinkScheduleCallMilliseconds = std::max(scheduleCallMilliseconds, 0.0);
+	mBackendPlayout.deckLinkScheduleFailureCount = scheduleFailureCount;
+}
+
+bool HealthTelemetry::TryRecordDeckLinkBufferTelemetry(bool actualBufferedFramesAvailable, uint64_t actualBufferedFrames,
+	std::size_t targetBufferedFrames, double scheduleCallMilliseconds, uint64_t scheduleFailureCount)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	mBackendPlayout.actualDeckLinkBufferedFramesAvailable = actualBufferedFramesAvailable;
+	mBackendPlayout.actualDeckLinkBufferedFrames = actualBufferedFramesAvailable ? actualBufferedFrames : 0;
+	mBackendPlayout.targetDeckLinkBufferedFrames = targetBufferedFrames;
+	mBackendPlayout.deckLinkScheduleCallMilliseconds = std::max(scheduleCallMilliseconds, 0.0);
+	mBackendPlayout.deckLinkScheduleFailureCount = scheduleFailureCount;
+	return true;
+}
+
+void HealthTelemetry::RecordOutputRenderPipelineTiming(
+	double drawMilliseconds,
+	double fenceWaitMilliseconds,
+	double mapMilliseconds,
+	double readbackCopyMilliseconds,
+	double cachedCopyMilliseconds,
+	double asyncQueueMilliseconds,
+	double asyncQueueBufferMilliseconds,
+	double asyncQueueSetupMilliseconds,
+	double asyncQueueReadPixelsMilliseconds,
+	double asyncQueueFenceMilliseconds,
+	double syncReadMilliseconds,
+	bool asyncReadbackMissed,
+	bool cachedFallbackUsed,
+	bool syncFallbackUsed)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mBackendPlayout.outputRenderDrawMilliseconds = std::max(drawMilliseconds, 0.0);
+	mBackendPlayout.outputReadbackFenceWaitMilliseconds = std::max(fenceWaitMilliseconds, 0.0);
+	mBackendPlayout.outputReadbackMapMilliseconds = std::max(mapMilliseconds, 0.0);
+	mBackendPlayout.outputReadbackCopyMilliseconds = std::max(readbackCopyMilliseconds, 0.0);
+	mBackendPlayout.outputCachedCopyMilliseconds = std::max(cachedCopyMilliseconds, 0.0);
+	mBackendPlayout.outputAsyncQueueMilliseconds = std::max(asyncQueueMilliseconds, 0.0);
+	mBackendPlayout.outputAsyncQueueBufferMilliseconds = std::max(asyncQueueBufferMilliseconds, 0.0);
+	mBackendPlayout.outputAsyncQueueSetupMilliseconds = std::max(asyncQueueSetupMilliseconds, 0.0);
+	mBackendPlayout.outputAsyncQueueReadPixelsMilliseconds = std::max(asyncQueueReadPixelsMilliseconds, 0.0);
+	mBackendPlayout.outputAsyncQueueFenceMilliseconds = std::max(asyncQueueFenceMilliseconds, 0.0);
+	mBackendPlayout.outputSyncReadMilliseconds = std::max(syncReadMilliseconds, 0.0);
+	if (asyncReadbackMissed)
+		++mBackendPlayout.outputAsyncReadbackMissCount;
+	if (cachedFallbackUsed)
+		++mBackendPlayout.outputCachedFallbackCount;
+	if (syncFallbackUsed)
+		++mBackendPlayout.outputSyncFallbackCount;
+}
+
+bool HealthTelemetry::TryRecordOutputRenderPipelineTiming(
+	double drawMilliseconds,
+	double fenceWaitMilliseconds,
+	double mapMilliseconds,
+	double readbackCopyMilliseconds,
+	double cachedCopyMilliseconds,
+	double asyncQueueMilliseconds,
+	double asyncQueueBufferMilliseconds,
+	double asyncQueueSetupMilliseconds,
+	double asyncQueueReadPixelsMilliseconds,
+	double asyncQueueFenceMilliseconds,
+	double syncReadMilliseconds,
+	bool asyncReadbackMissed,
+	bool cachedFallbackUsed,
+	bool syncFallbackUsed)
+{
+	std::unique_lock<std::mutex> lock(mMutex, std::try_to_lock);
+	if (!lock.owns_lock())
+		return false;
+
+	mBackendPlayout.outputRenderDrawMilliseconds = std::max(drawMilliseconds, 0.0);
+	mBackendPlayout.outputReadbackFenceWaitMilliseconds = std::max(fenceWaitMilliseconds, 0.0);
+	mBackendPlayout.outputReadbackMapMilliseconds = std::max(mapMilliseconds, 0.0);
+	mBackendPlayout.outputReadbackCopyMilliseconds = std::max(readbackCopyMilliseconds, 0.0);
+	mBackendPlayout.outputCachedCopyMilliseconds = std::max(cachedCopyMilliseconds, 0.0);
+	mBackendPlayout.outputAsyncQueueMilliseconds = std::max(asyncQueueMilliseconds, 0.0);
+	mBackendPlayout.outputAsyncQueueBufferMilliseconds = std::max(asyncQueueBufferMilliseconds, 0.0);
+	mBackendPlayout.outputAsyncQueueSetupMilliseconds = std::max(asyncQueueSetupMilliseconds, 0.0);
+	mBackendPlayout.outputAsyncQueueReadPixelsMilliseconds = std::max(asyncQueueReadPixelsMilliseconds, 0.0);
+	mBackendPlayout.outputAsyncQueueFenceMilliseconds = std::max(asyncQueueFenceMilliseconds, 0.0);
+	mBackendPlayout.outputSyncReadMilliseconds = std::max(syncReadMilliseconds, 0.0);
+	if (asyncReadbackMissed)
+		++mBackendPlayout.outputAsyncReadbackMissCount;
+	if (cachedFallbackUsed)
+		++mBackendPlayout.outputCachedFallbackCount;
+	if (syncFallbackUsed)
+		++mBackendPlayout.outputSyncFallbackCount;
+	return true;
+}
+
+HealthTelemetry::SignalStatusSnapshot HealthTelemetry::GetSignalStatusSnapshot() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mSignalStatus;
+}
+
+HealthTelemetry::VideoIOStatusSnapshot HealthTelemetry::GetVideoIOStatusSnapshot() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mVideoIOStatus;
+}
+
+HealthTelemetry::PerformanceSnapshot HealthTelemetry::GetPerformanceSnapshot() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mPerformance;
+}
+
+HealthTelemetry::RuntimeEventMetricsSnapshot HealthTelemetry::GetRuntimeEventMetricsSnapshot() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mRuntimeEvents;
+}
+
+HealthTelemetry::PersistenceSnapshot HealthTelemetry::GetPersistenceSnapshot() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mPersistence;
+}
+
+HealthTelemetry::BackendPlayoutSnapshot HealthTelemetry::GetBackendPlayoutSnapshot() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mBackendPlayout;
+}
+
+HealthTelemetry::Snapshot HealthTelemetry::GetSnapshot() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+
+	Snapshot snapshot;
+	snapshot.signal = mSignalStatus;
+	snapshot.videoIO = mVideoIOStatus;
+	snapshot.performance = mPerformance;
+	snapshot.runtimeEvents = mRuntimeEvents;
+	snapshot.persistence = mPersistence;
+	snapshot.backendPlayout = mBackendPlayout;
+	return snapshot;
+}

apps/LoopThroughWithOpenGLCompositing/runtime/telemetry/HealthTelemetry.h

@@ -0,0 +1,273 @@
+#pragma once
+
+#include <mutex>
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
+// HealthTelemetry owns the current operational status snapshot directly, so
+// callers can report health without sharing runtime-store state.
+class HealthTelemetry
+{
+public:
+	struct SignalStatusSnapshot
+	{
+		bool hasSignal = false;
+		unsigned width = 0;
+		unsigned height = 0;
+		std::string modeName;
+	};
+
+	struct VideoIOStatusSnapshot
+	{
+		std::string backendName = "decklink";
+		std::string modelName;
+		bool supportsInternalKeying = false;
+		bool supportsExternalKeying = false;
+		bool keyerInterfaceAvailable = false;
+		bool externalKeyingRequested = false;
+		bool externalKeyingActive = false;
+		std::string statusMessage;
+	};
+
+	struct PerformanceSnapshot
+	{
+		double frameBudgetMilliseconds = 0.0;
+		double renderMilliseconds = 0.0;
+		double smoothedRenderMilliseconds = 0.0;
+		double completionIntervalMilliseconds = 0.0;
+		double smoothedCompletionIntervalMilliseconds = 0.0;
+		double maxCompletionIntervalMilliseconds = 0.0;
+		uint64_t lateFrameCount = 0;
+		uint64_t droppedFrameCount = 0;
+		uint64_t flushedFrameCount = 0;
+	};
+
+	struct RuntimeEventQueueSnapshot
+	{
+		std::string queueName = "runtime-events";
+		std::size_t depth = 0;
+		std::size_t capacity = 0;
+		uint64_t droppedCount = 0;
+		double oldestEventAgeMilliseconds = 0.0;
+	};
+
+	struct RuntimeEventDispatchSnapshot
+	{
+		uint64_t dispatchCallCount = 0;
+		uint64_t dispatchedEventCount = 0;
+		uint64_t handlerInvocationCount = 0;
+		uint64_t handlerFailureCount = 0;
+		double lastDispatchDurationMilliseconds = 0.0;
+		double maxDispatchDurationMilliseconds = 0.0;
+	};
+
+	struct RuntimeEventMetricsSnapshot
+	{
+		RuntimeEventQueueSnapshot queue;
+		RuntimeEventDispatchSnapshot dispatch;
+	};
+
+	struct PersistenceSnapshot
+	{
+		uint64_t writeSuccessCount = 0;
+		uint64_t writeFailureCount = 0;
+		bool lastWriteSucceeded = true;
+		bool unsavedChanges = false;
+		bool newerRequestPending = false;
+		std::string lastTargetKind;
+		std::string lastTargetPath;
+		std::string lastReason;
+		std::string lastErrorMessage;
+	};
+
+	struct BackendPlayoutSnapshot
+	{
+		std::string lifecycleState = "NotStarted";
+		std::string completionResult = "Unknown";
+		std::size_t readyQueueDepth = 0;
+		std::size_t readyQueueCapacity = 0;
+		std::size_t minReadyQueueDepth = 0;
+		std::size_t maxReadyQueueDepth = 0;
+		uint64_t readyQueueZeroDepthCount = 0;
+		uint64_t readyQueuePushedCount = 0;
+		uint64_t readyQueuePoppedCount = 0;
+		uint64_t readyQueueDroppedCount = 0;
+		uint64_t readyQueueUnderrunCount = 0;
+		std::size_t systemFramePoolFree = 0;
+		std::size_t systemFramePoolReady = 0;
+		std::size_t systemFramePoolScheduled = 0;
+		uint64_t systemFrameUnderrunCount = 0;
+		uint64_t systemFrameRepeatCount = 0;
+		uint64_t systemFrameDropCount = 0;
+		double systemFrameAgeAtScheduleMilliseconds = 0.0;
+		double systemFrameAgeAtCompletionMilliseconds = 0.0;
+		double outputRenderMilliseconds = 0.0;
+		double smoothedOutputRenderMilliseconds = 0.0;
+		double maxOutputRenderMilliseconds = 0.0;
+		double outputFrameAcquireMilliseconds = 0.0;
+		double outputFrameRenderRequestMilliseconds = 0.0;
+		double outputFrameEndAccessMilliseconds = 0.0;
+		double outputRenderQueueWaitMilliseconds = 0.0;
+		double outputRenderDrawMilliseconds = 0.0;
+		double outputReadbackFenceWaitMilliseconds = 0.0;
+		double outputReadbackMapMilliseconds = 0.0;
+		double outputReadbackCopyMilliseconds = 0.0;
+		double outputCachedCopyMilliseconds = 0.0;
+		double outputAsyncQueueMilliseconds = 0.0;
+		double outputAsyncQueueBufferMilliseconds = 0.0;
+		double outputAsyncQueueSetupMilliseconds = 0.0;
+		double outputAsyncQueueReadPixelsMilliseconds = 0.0;
+		double outputAsyncQueueFenceMilliseconds = 0.0;
+		double outputSyncReadMilliseconds = 0.0;
+		uint64_t outputAsyncReadbackMissCount = 0;
+		uint64_t outputCachedFallbackCount = 0;
+		uint64_t outputSyncFallbackCount = 0;
+		uint64_t completedFrameIndex = 0;
+		uint64_t scheduledFrameIndex = 0;
+		uint64_t scheduledLeadFrames = 0;
+		bool actualDeckLinkBufferedFramesAvailable = false;
+		uint64_t actualDeckLinkBufferedFrames = 0;
+		std::size_t targetDeckLinkBufferedFrames = 0;
+		double deckLinkScheduleCallMilliseconds = 0.0;
+		uint64_t deckLinkScheduleFailureCount = 0;
+		uint64_t measuredLagFrames = 0;
+		uint64_t catchUpFrames = 0;
+		uint64_t lateStreak = 0;
+		uint64_t dropStreak = 0;
+		uint64_t lateFrameCount = 0;
+		uint64_t droppedFrameCount = 0;
+		uint64_t flushedFrameCount = 0;
+		bool degraded = false;
+		std::string statusMessage;
+	};
+
+	struct Snapshot
+	{
+		SignalStatusSnapshot signal;
+		VideoIOStatusSnapshot videoIO;
+		PerformanceSnapshot performance;
+		RuntimeEventMetricsSnapshot runtimeEvents;
+		PersistenceSnapshot persistence;
+		BackendPlayoutSnapshot backendPlayout;
+	};
+
+	HealthTelemetry() = default;
+
+	void ReportSignalStatus(bool hasSignal, unsigned width, unsigned height, const std::string& modeName);
+	bool TryReportSignalStatus(bool hasSignal, unsigned width, unsigned height, const std::string& modeName);
+
+	void ReportVideoIOStatus(const std::string& backendName, const std::string& modelName,
+		bool supportsInternalKeying, bool supportsExternalKeying, bool keyerInterfaceAvailable,
+		bool externalKeyingRequested, bool externalKeyingActive, const std::string& statusMessage);
+	bool TryReportVideoIOStatus(const std::string& backendName, const std::string& modelName,
+		bool supportsInternalKeying, bool supportsExternalKeying, bool keyerInterfaceAvailable,
+		bool externalKeyingRequested, bool externalKeyingActive, const std::string& statusMessage);
+
+	void RecordPerformanceStats(double frameBudgetMilliseconds, double renderMilliseconds);
+	bool TryRecordPerformanceStats(double frameBudgetMilliseconds, double renderMilliseconds);
+
+	void RecordFramePacingStats(double completionIntervalMilliseconds, double smoothedCompletionIntervalMilliseconds,
+		double maxCompletionIntervalMilliseconds, uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount);
+	bool TryRecordFramePacingStats(double completionIntervalMilliseconds, double smoothedCompletionIntervalMilliseconds,
+		double maxCompletionIntervalMilliseconds, uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount);
+
+	void RecordRuntimeEventQueueMetrics(const std::string& queueName, std::size_t depth, std::size_t capacity,
+		uint64_t droppedCount, double oldestEventAgeMilliseconds);
+	bool TryRecordRuntimeEventQueueMetrics(const std::string& queueName, std::size_t depth, std::size_t capacity,
+		uint64_t droppedCount, double oldestEventAgeMilliseconds);
+
+	void RecordRuntimeEventDispatchStats(std::size_t dispatchedEvents, std::size_t handlerInvocations,
+		std::size_t handlerFailures, double dispatchDurationMilliseconds);
+	bool TryRecordRuntimeEventDispatchStats(std::size_t dispatchedEvents, std::size_t handlerInvocations,
+		std::size_t handlerFailures, double dispatchDurationMilliseconds);
+
+	void RecordPersistenceWriteResult(bool succeeded, const std::string& targetKind, const std::string& targetPath,
+		const std::string& reason, const std::string& errorMessage, bool newerRequestPending);
+	bool TryRecordPersistenceWriteResult(bool succeeded, const std::string& targetKind, const std::string& targetPath,
+		const std::string& reason, const std::string& errorMessage, bool newerRequestPending);
+
+	void RecordBackendPlayoutHealth(const std::string& lifecycleState, const std::string& completionResult,
+		std::size_t readyQueueDepth, std::size_t readyQueueCapacity, uint64_t readyQueuePushedCount,
+		std::size_t minReadyQueueDepth, std::size_t maxReadyQueueDepth, uint64_t readyQueueZeroDepthCount,
+		uint64_t readyQueuePoppedCount, uint64_t readyQueueDroppedCount, uint64_t readyQueueUnderrunCount,
+		double outputRenderMilliseconds, double smoothedOutputRenderMilliseconds, double maxOutputRenderMilliseconds,
+		double outputFrameAcquireMilliseconds, double outputFrameRenderRequestMilliseconds, double outputFrameEndAccessMilliseconds,
+		uint64_t completedFrameIndex, uint64_t scheduledFrameIndex, uint64_t scheduledLeadFrames,
+		uint64_t measuredLagFrames, uint64_t catchUpFrames, uint64_t lateStreak, uint64_t dropStreak,
+		uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount,
+		bool degraded, const std::string& statusMessage);
+	bool TryRecordBackendPlayoutHealth(const std::string& lifecycleState, const std::string& completionResult,
+		std::size_t readyQueueDepth, std::size_t readyQueueCapacity, uint64_t readyQueuePushedCount,
+		std::size_t minReadyQueueDepth, std::size_t maxReadyQueueDepth, uint64_t readyQueueZeroDepthCount,
+		uint64_t readyQueuePoppedCount, uint64_t readyQueueDroppedCount, uint64_t readyQueueUnderrunCount,
+		double outputRenderMilliseconds, double smoothedOutputRenderMilliseconds, double maxOutputRenderMilliseconds,
+		double outputFrameAcquireMilliseconds, double outputFrameRenderRequestMilliseconds, double outputFrameEndAccessMilliseconds,
+		uint64_t completedFrameIndex, uint64_t scheduledFrameIndex, uint64_t scheduledLeadFrames,
+		uint64_t measuredLagFrames, uint64_t catchUpFrames, uint64_t lateStreak, uint64_t dropStreak,
+		uint64_t lateFrameCount, uint64_t droppedFrameCount, uint64_t flushedFrameCount,
+		bool degraded, const std::string& statusMessage);
+
+	void RecordOutputRenderQueueWait(double queueWaitMilliseconds);
+	bool TryRecordOutputRenderQueueWait(double queueWaitMilliseconds);
+
+	void RecordSystemMemoryPlayoutStats(std::size_t freeFrameCount, std::size_t readyFrameCount,
+		std::size_t scheduledFrameCount, uint64_t underrunCount, uint64_t repeatCount, uint64_t dropCount,
+		double frameAgeAtScheduleMilliseconds, double frameAgeAtCompletionMilliseconds);
+	bool TryRecordSystemMemoryPlayoutStats(std::size_t freeFrameCount, std::size_t readyFrameCount,
+		std::size_t scheduledFrameCount, uint64_t underrunCount, uint64_t repeatCount, uint64_t dropCount,
+		double frameAgeAtScheduleMilliseconds, double frameAgeAtCompletionMilliseconds);
+
+	void RecordDeckLinkBufferTelemetry(bool actualBufferedFramesAvailable, uint64_t actualBufferedFrames,
+		std::size_t targetBufferedFrames, double scheduleCallMilliseconds, uint64_t scheduleFailureCount);
+	bool TryRecordDeckLinkBufferTelemetry(bool actualBufferedFramesAvailable, uint64_t actualBufferedFrames,
+		std::size_t targetBufferedFrames, double scheduleCallMilliseconds, uint64_t scheduleFailureCount);
+
+	void RecordOutputRenderPipelineTiming(
+		double drawMilliseconds,
+		double fenceWaitMilliseconds,
+		double mapMilliseconds,
+		double readbackCopyMilliseconds,
+		double cachedCopyMilliseconds,
+		double asyncQueueMilliseconds,
+		double asyncQueueBufferMilliseconds,
+		double asyncQueueSetupMilliseconds,
+		double asyncQueueReadPixelsMilliseconds,
+		double asyncQueueFenceMilliseconds,
+		double syncReadMilliseconds,
+		bool asyncReadbackMissed,
+		bool cachedFallbackUsed,
+		bool syncFallbackUsed);
+	bool TryRecordOutputRenderPipelineTiming(
+		double drawMilliseconds,
+		double fenceWaitMilliseconds,
+		double mapMilliseconds,
+		double readbackCopyMilliseconds,
+		double cachedCopyMilliseconds,
+		double asyncQueueMilliseconds,
+		double asyncQueueBufferMilliseconds,
+		double asyncQueueSetupMilliseconds,
+		double asyncQueueReadPixelsMilliseconds,
+		double asyncQueueFenceMilliseconds,
+		double syncReadMilliseconds,
+		bool asyncReadbackMissed,
+		bool cachedFallbackUsed,
+		bool syncFallbackUsed);
+
+	SignalStatusSnapshot GetSignalStatusSnapshot() const;
+	VideoIOStatusSnapshot GetVideoIOStatusSnapshot() const;
+	PerformanceSnapshot GetPerformanceSnapshot() const;
+	RuntimeEventMetricsSnapshot GetRuntimeEventMetricsSnapshot() const;
+	PersistenceSnapshot GetPersistenceSnapshot() const;
+	BackendPlayoutSnapshot GetBackendPlayoutSnapshot() const;
+	Snapshot GetSnapshot() const;
+
+private:
+	mutable std::mutex mMutex;
+	SignalStatusSnapshot mSignalStatus;
+	VideoIOStatusSnapshot mVideoIOStatus;
+	PerformanceSnapshot mPerformance;
+	RuntimeEventMetricsSnapshot mRuntimeEvents;
+	PersistenceSnapshot mPersistence;
+	BackendPlayoutSnapshot mBackendPlayout;
+};

apps/LoopThroughWithOpenGLCompositing/videoio/OutputProductionController.cpp

@@ -0,0 +1,89 @@
+#include "OutputProductionController.h"
+
+#include <algorithm>
+
+namespace
+{
+std::size_t ClampReadyLimit(unsigned value, std::size_t capacity)
+{
+	const std::size_t requested = static_cast<std::size_t>(value);
+	if (capacity == 0)
+		return requested;
+	return (std::min)(requested, capacity);
+}
+}
+
+OutputProductionController::OutputProductionController(const VideoPlayoutPolicy& policy) :
+	mPolicy(NormalizeVideoPlayoutPolicy(policy))
+{
+}
+
+void OutputProductionController::Configure(const VideoPlayoutPolicy& policy)
+{
+	mPolicy = NormalizeVideoPlayoutPolicy(policy);
+}
+
+OutputProductionDecision OutputProductionController::Decide(const OutputProductionPressure& pressure) const
+{
+	OutputProductionDecision decision;
+
+	const std::size_t configuredMaxReadyFrames = static_cast<std::size_t>(mPolicy.maxReadyFrames);
+	const std::size_t effectiveMaxReadyFrames = pressure.readyQueueCapacity > 0
+		? (std::min)(configuredMaxReadyFrames, pressure.readyQueueCapacity)
+		: configuredMaxReadyFrames;
+	const std::size_t effectiveTargetReadyFrames = (std::min)(
+		ClampReadyLimit(mPolicy.targetReadyFrames, pressure.readyQueueCapacity),
+		effectiveMaxReadyFrames);
+
+	decision.targetReadyFrames = effectiveTargetReadyFrames;
+	decision.maxReadyFrames = effectiveMaxReadyFrames;
+
+	if (effectiveMaxReadyFrames == 0)
+	{
+		decision.action = OutputProductionAction::Throttle;
+		decision.reason = "no-ready-frame-capacity";
+		return decision;
+	}
+
+	if (pressure.readyQueueDepth >= effectiveMaxReadyFrames)
+	{
+		decision.action = OutputProductionAction::Throttle;
+		decision.reason = "ready-queue-full";
+		return decision;
+	}
+
+	if (pressure.readyQueueDepth < effectiveTargetReadyFrames)
+	{
+		decision.action = OutputProductionAction::Produce;
+		decision.requestedFrames = effectiveTargetReadyFrames - pressure.readyQueueDepth;
+		decision.reason = "ready-queue-below-target";
+		return decision;
+	}
+
+	if ((pressure.lateStreak > 0 || pressure.dropStreak > 0 || pressure.readyQueueUnderrunCount > 0) &&
+		pressure.readyQueueDepth < effectiveMaxReadyFrames)
+	{
+		decision.action = OutputProductionAction::Produce;
+		decision.requestedFrames = 1;
+		decision.reason = "playout-pressure";
+		return decision;
+	}
+
+	decision.action = OutputProductionAction::Wait;
+	decision.reason = "ready-queue-at-target";
+	return decision;
+}
+
+const char* OutputProductionActionName(OutputProductionAction action)
+{
+	switch (action)
+	{
+	case OutputProductionAction::Produce:
+		return "Produce";
+	case OutputProductionAction::Throttle:
+		return "Throttle";
+	case OutputProductionAction::Wait:
+	default:
+		return "Wait";
+	}
+}

apps/LoopThroughWithOpenGLCompositing/videoio/OutputProductionController.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "VideoPlayoutPolicy.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
+enum class OutputProductionAction
+{
+	Produce,
+	Wait,
+	Throttle
+};
+
+struct OutputProductionPressure
+{
+	std::size_t readyQueueDepth = 0;
+	std::size_t readyQueueCapacity = 0;
+	uint64_t readyQueueUnderrunCount = 0;
+	uint64_t lateStreak = 0;
+	uint64_t dropStreak = 0;
+};
+
+struct OutputProductionDecision
+{
+	OutputProductionAction action = OutputProductionAction::Wait;
+	std::size_t requestedFrames = 0;
+	std::size_t targetReadyFrames = 0;
+	std::size_t maxReadyFrames = 0;
+	std::string reason;
+};
+
+class OutputProductionController
+{
+public:
+	explicit OutputProductionController(const VideoPlayoutPolicy& policy = VideoPlayoutPolicy());
+
+	void Configure(const VideoPlayoutPolicy& policy);
+	OutputProductionDecision Decide(const OutputProductionPressure& pressure) const;
+
+private:
+	VideoPlayoutPolicy mPolicy;
+};
+
+const char* OutputProductionActionName(OutputProductionAction action);

apps/LoopThroughWithOpenGLCompositing/videoio/RenderCadenceController.cpp

@@ -0,0 +1,102 @@
+#include "RenderCadenceController.h"
+
+#include <algorithm>
+#include <cmath>
+
+void RenderCadenceController::Configure(Duration targetFrameDuration, TimePoint firstRenderTime, const RenderCadencePolicy& policy)
+{
+	mTargetFrameDuration = IsPositive(targetFrameDuration) ? targetFrameDuration : std::chrono::milliseconds(1);
+	mPolicy = policy;
+	if (mPolicy.skipThresholdFrames < 1.0)
+		mPolicy.skipThresholdFrames = 1.0;
+	Reset(firstRenderTime);
+}
+
+void RenderCadenceController::Reset(TimePoint firstRenderTime)
+{
+	mNextRenderTime = firstRenderTime;
+	mNextFrameIndex = 0;
+	mMetrics = RenderCadenceMetrics();
+}
+
+RenderCadenceDecision RenderCadenceController::Tick(TimePoint now)
+{
+	RenderCadenceDecision decision;
+	decision.frameIndex = mNextFrameIndex;
+	decision.renderTargetTime = mNextRenderTime;
+	decision.nextRenderTime = mNextRenderTime;
+
+	if (now < mNextRenderTime)
+	{
+		decision.action = RenderCadenceAction::Wait;
+		decision.waitDuration = mNextRenderTime - now;
+		decision.reason = "waiting-for-next-render-tick";
+		return decision;
+	}
+
+	const Duration lateness = now - mNextRenderTime;
+	const uint64_t skippedTicks = SkippedTicksForLateness(lateness);
+	if (skippedTicks > 0)
+	{
+		decision.skippedTicks = skippedTicks;
+		decision.frameIndex = mNextFrameIndex + skippedTicks;
+		decision.renderTargetTime = mNextRenderTime + (mTargetFrameDuration * skippedTicks);
+		decision.reason = "late-skip-render-ticks";
+		mMetrics.skippedTickCount += skippedTicks;
+	}
+	else
+	{
+		decision.reason = IsPositive(lateness) ? "late-render-now" : "on-time-render";
+	}
+
+	decision.action = RenderCadenceAction::Render;
+	decision.lateness = now > decision.renderTargetTime
+		? now - decision.renderTargetTime
+		: Duration::zero();
+	mNextFrameIndex = decision.frameIndex + 1;
+	mNextRenderTime = decision.renderTargetTime + mTargetFrameDuration;
+	decision.nextRenderTime = mNextRenderTime;
+
+	++mMetrics.renderedFrameCount;
+	mMetrics.nextFrameIndex = mNextFrameIndex;
+	mMetrics.lastLateness = decision.lateness;
+	if (IsPositive(decision.lateness))
+	{
+		++mMetrics.lateFrameCount;
+		mMetrics.maxLateness = (std::max)(mMetrics.maxLateness, decision.lateness);
+	}
+
+	return decision;
+}
+
+uint64_t RenderCadenceController::SkippedTicksForLateness(Duration lateness) const
+{
+	if (!mPolicy.skipLateTicks || !IsPositive(lateness) || !IsPositive(mTargetFrameDuration))
+		return 0;
+
+	const double lateFrames = static_cast<double>(lateness.count()) / static_cast<double>(mTargetFrameDuration.count());
+	if (lateFrames < mPolicy.skipThresholdFrames)
+		return 0;
+
+	const uint64_t elapsedTicks = static_cast<uint64_t>(std::floor(lateFrames));
+	if (elapsedTicks == 0)
+		return 0;
+	return (std::min)(elapsedTicks, mPolicy.maxSkippedTicksPerDecision);
+}
+
+bool RenderCadenceController::IsPositive(Duration duration)
+{
+	return duration > Duration::zero();
+}
+
+const char* RenderCadenceActionName(RenderCadenceAction action)
+{
+	switch (action)
+	{
+	case RenderCadenceAction::Render:
+		return "Render";
+	case RenderCadenceAction::Wait:
+	default:
+		return "Wait";
+	}
+}

apps/LoopThroughWithOpenGLCompositing/videoio/RenderCadenceController.h

@@ -0,0 +1,68 @@
+#pragma once
+
+#include <chrono>
+#include <cstdint>
+
+enum class RenderCadenceAction
+{
+	Wait,
+	Render
+};
+
+struct RenderCadencePolicy
+{
+	bool skipLateTicks = true;
+	uint64_t maxSkippedTicksPerDecision = 4;
+	double skipThresholdFrames = 2.0;
+};
+
+struct RenderCadenceDecision
+{
+	RenderCadenceAction action = RenderCadenceAction::Wait;
+	uint64_t frameIndex = 0;
+	uint64_t skippedTicks = 0;
+	std::chrono::steady_clock::time_point renderTargetTime;
+	std::chrono::steady_clock::time_point nextRenderTime;
+	std::chrono::steady_clock::duration waitDuration = std::chrono::steady_clock::duration::zero();
+	std::chrono::steady_clock::duration lateness = std::chrono::steady_clock::duration::zero();
+	const char* reason = "waiting-for-next-render-tick";
+};
+
+struct RenderCadenceMetrics
+{
+	uint64_t nextFrameIndex = 0;
+	uint64_t renderedFrameCount = 0;
+	uint64_t skippedTickCount = 0;
+	uint64_t lateFrameCount = 0;
+	std::chrono::steady_clock::duration lastLateness = std::chrono::steady_clock::duration::zero();
+	std::chrono::steady_clock::duration maxLateness = std::chrono::steady_clock::duration::zero();
+};
+
+class RenderCadenceController
+{
+public:
+	using Clock = std::chrono::steady_clock;
+	using TimePoint = Clock::time_point;
+	using Duration = Clock::duration;
+
+	void Configure(Duration targetFrameDuration, TimePoint firstRenderTime, const RenderCadencePolicy& policy = RenderCadencePolicy());
+	void Reset(TimePoint firstRenderTime);
+	RenderCadenceDecision Tick(TimePoint now);
+
+	Duration TargetFrameDuration() const { return mTargetFrameDuration; }
+	TimePoint NextRenderTime() const { return mNextRenderTime; }
+	uint64_t NextFrameIndex() const { return mNextFrameIndex; }
+	const RenderCadenceMetrics& Metrics() const { return mMetrics; }
+
+private:
+	uint64_t SkippedTicksForLateness(Duration lateness) const;
+	static bool IsPositive(Duration duration);
+
+	Duration mTargetFrameDuration = std::chrono::milliseconds(16);
+	TimePoint mNextRenderTime;
+	uint64_t mNextFrameIndex = 0;
+	RenderCadencePolicy mPolicy;
+	RenderCadenceMetrics mMetrics;
+};
+
+const char* RenderCadenceActionName(RenderCadenceAction action);

apps/LoopThroughWithOpenGLCompositing/videoio/RenderOutputQueue.cpp

@@ -0,0 +1,93 @@
+#include "RenderOutputQueue.h"
+
+RenderOutputQueue::RenderOutputQueue(const VideoPlayoutPolicy& policy) :
+	mPolicy(NormalizeVideoPlayoutPolicy(policy))
+{
+}
+
+void RenderOutputQueue::Configure(const VideoPlayoutPolicy& policy)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mPolicy = NormalizeVideoPlayoutPolicy(policy);
+	while (mReadyFrames.size() > CapacityLocked())
+	{
+		ReleaseFrame(mReadyFrames.front());
+		mReadyFrames.pop_front();
+		++mDroppedCount;
+	}
+}
+
+bool RenderOutputQueue::Push(RenderOutputFrame frame)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mReadyFrames.size() >= CapacityLocked())
+	{
+		ReleaseFrame(mReadyFrames.front());
+		mReadyFrames.pop_front();
+		++mDroppedCount;
+	}
+
+	mReadyFrames.push_back(frame);
+	++mPushedCount;
+	return true;
+}
+
+bool RenderOutputQueue::TryPop(RenderOutputFrame& frame)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mReadyFrames.empty())
+	{
+		++mUnderrunCount;
+		return false;
+	}
+
+	frame = mReadyFrames.front();
+	mReadyFrames.pop_front();
+	++mPoppedCount;
+	return true;
+}
+
+bool RenderOutputQueue::DropOldestFrame()
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mReadyFrames.empty())
+		return false;
+
+	ReleaseFrame(mReadyFrames.front());
+	mReadyFrames.pop_front();
+	++mDroppedCount;
+	return true;
+}
+
+void RenderOutputQueue::Clear()
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	for (RenderOutputFrame& frame : mReadyFrames)
+		ReleaseFrame(frame);
+	mReadyFrames.clear();
+}
+
+RenderOutputQueueMetrics RenderOutputQueue::GetMetrics() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	RenderOutputQueueMetrics metrics;
+	metrics.depth = mReadyFrames.size();
+	metrics.capacity = CapacityLocked();
+	metrics.pushedCount = mPushedCount;
+	metrics.poppedCount = mPoppedCount;
+	metrics.droppedCount = mDroppedCount;
+	metrics.underrunCount = mUnderrunCount;
+	return metrics;
+}
+
+std::size_t RenderOutputQueue::CapacityLocked() const
+{
+	return static_cast<std::size_t>(mPolicy.maxReadyFrames);
+}
+
+void RenderOutputQueue::ReleaseFrame(RenderOutputFrame& frame)
+{
+	if (frame.releaseFrame)
+		frame.releaseFrame(frame.frame);
+	frame.releaseFrame = {};
+}

apps/LoopThroughWithOpenGLCompositing/videoio/RenderOutputQueue.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include "VideoIOTypes.h"
+#include "VideoPlayoutPolicy.h"
+
+#include <cstdint>
+#include <deque>
+#include <functional>
+#include <mutex>
+
+struct RenderOutputFrame
+{
+	VideoIOOutputFrame frame;
+	uint64_t frameIndex = 0;
+	bool stale = false;
+	std::function<void(VideoIOOutputFrame& frame)> releaseFrame;
+};
+
+struct RenderOutputQueueMetrics
+{
+	std::size_t depth = 0;
+	std::size_t capacity = 0;
+	uint64_t pushedCount = 0;
+	uint64_t poppedCount = 0;
+	uint64_t droppedCount = 0;
+	uint64_t underrunCount = 0;
+};
+
+class RenderOutputQueue
+{
+public:
+	explicit RenderOutputQueue(const VideoPlayoutPolicy& policy = VideoPlayoutPolicy());
+
+	void Configure(const VideoPlayoutPolicy& policy);
+	bool Push(RenderOutputFrame frame);
+	bool TryPop(RenderOutputFrame& frame);
+	bool DropOldestFrame();
+	void Clear();
+	RenderOutputQueueMetrics GetMetrics() const;
+
+private:
+	std::size_t CapacityLocked() const;
+	static void ReleaseFrame(RenderOutputFrame& frame);
+
+	mutable std::mutex mMutex;
+	VideoPlayoutPolicy mPolicy;
+	std::deque<RenderOutputFrame> mReadyFrames;
+	uint64_t mPushedCount = 0;
+	uint64_t mPoppedCount = 0;
+	uint64_t mDroppedCount = 0;
+	uint64_t mUnderrunCount = 0;
+};

apps/LoopThroughWithOpenGLCompositing/videoio/SystemOutputFramePool.cpp

@@ -0,0 +1,260 @@
+#include "SystemOutputFramePool.h"
+
+#include <algorithm>
+
+namespace
+{
+SystemOutputFramePoolConfig NormalizeConfig(SystemOutputFramePoolConfig config)
+{
+	if (config.rowBytes == 0)
+		config.rowBytes = VideoIORowBytes(config.pixelFormat, config.width);
+	return config;
+}
+}
+
+SystemOutputFramePool::SystemOutputFramePool(const SystemOutputFramePoolConfig& config)
+{
+	Configure(config);
+}
+
+void SystemOutputFramePool::Configure(const SystemOutputFramePoolConfig& config)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mConfig = NormalizeConfig(config);
+	mReadySlots.clear();
+	mSlots.clear();
+	mSlots.resize(mConfig.capacity);
+
+	const std::size_t byteCount = FrameByteCount();
+	for (StoredSlot& slot : mSlots)
+	{
+		slot.bytes.resize(byteCount);
+		slot.state = OutputFrameSlotState::Free;
+		++slot.generation;
+	}
+
+	mAcquireMissCount = 0;
+	mReadyUnderrunCount = 0;
+}
+
+SystemOutputFramePoolConfig SystemOutputFramePool::Config() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mConfig;
+}
+
+bool SystemOutputFramePool::AcquireFreeSlot(OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	for (std::size_t index = 0; index < mSlots.size(); ++index)
+	{
+		if (mSlots[index].state != OutputFrameSlotState::Free)
+			continue;
+
+		mSlots[index].state = OutputFrameSlotState::Rendering;
+		++mSlots[index].generation;
+		FillOutputSlotLocked(index, slot);
+		return true;
+	}
+
+	slot = OutputFrameSlot();
+	++mAcquireMissCount;
+	return false;
+}
+
+bool SystemOutputFramePool::AcquireRenderingSlot(OutputFrameSlot& slot)
+{
+	return AcquireFreeSlot(slot);
+}
+
+bool SystemOutputFramePool::PublishReadySlot(const OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!TransitionSlotLocked(slot, OutputFrameSlotState::Rendering, OutputFrameSlotState::Completed))
+		return false;
+
+	mReadySlots.push_back(slot.index);
+	return true;
+}
+
+bool SystemOutputFramePool::PublishCompletedSlot(const OutputFrameSlot& slot)
+{
+	return PublishReadySlot(slot);
+}
+
+bool SystemOutputFramePool::ConsumeReadySlot(OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	while (!mReadySlots.empty())
+	{
+		const std::size_t index = mReadySlots.front();
+		mReadySlots.pop_front();
+		if (index >= mSlots.size() || mSlots[index].state != OutputFrameSlotState::Completed)
+			continue;
+
+		FillOutputSlotLocked(index, slot);
+		return true;
+	}
+
+	slot = OutputFrameSlot();
+	++mReadyUnderrunCount;
+	return false;
+}
+
+bool SystemOutputFramePool::ConsumeCompletedSlot(OutputFrameSlot& slot)
+{
+	return ConsumeReadySlot(slot);
+}
+
+bool SystemOutputFramePool::MarkScheduled(const OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!IsValidSlotLocked(slot))
+		return false;
+	if (mSlots[slot.index].state != OutputFrameSlotState::Completed)
+		return false;
+
+	RemoveReadyIndexLocked(slot.index);
+	mSlots[slot.index].state = OutputFrameSlotState::Scheduled;
+	return true;
+}
+
+bool SystemOutputFramePool::MarkScheduledByBuffer(void* bytes)
+{
+	if (bytes == nullptr)
+		return false;
+
+	std::lock_guard<std::mutex> lock(mMutex);
+	for (std::size_t index = 0; index < mSlots.size(); ++index)
+	{
+		if (mSlots[index].bytes.empty() || mSlots[index].bytes.data() != bytes)
+			continue;
+		if (mSlots[index].state != OutputFrameSlotState::Completed)
+			return false;
+
+		RemoveReadyIndexLocked(index);
+		mSlots[index].state = OutputFrameSlotState::Scheduled;
+		return true;
+	}
+	return false;
+}
+
+bool SystemOutputFramePool::ReleaseSlot(const OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!IsValidSlotLocked(slot) || mSlots[slot.index].state == OutputFrameSlotState::Free)
+		return false;
+
+	return ReleaseSlotByIndexLocked(slot.index);
+}
+
+bool SystemOutputFramePool::ReleaseScheduledSlot(const OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return TransitionSlotLocked(slot, OutputFrameSlotState::Scheduled, OutputFrameSlotState::Free);
+}
+
+bool SystemOutputFramePool::ReleaseSlotByBuffer(void* bytes)
+{
+	if (bytes == nullptr)
+		return false;
+
+	std::lock_guard<std::mutex> lock(mMutex);
+	for (std::size_t index = 0; index < mSlots.size(); ++index)
+	{
+		if (!mSlots[index].bytes.empty() && mSlots[index].bytes.data() == bytes)
+			return ReleaseSlotByIndexLocked(index);
+	}
+	return false;
+}
+
+void SystemOutputFramePool::Clear()
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mReadySlots.clear();
+	for (StoredSlot& slot : mSlots)
+	{
+		slot.state = OutputFrameSlotState::Free;
+		++slot.generation;
+	}
+}
+
+SystemOutputFramePoolMetrics SystemOutputFramePool::GetMetrics() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	SystemOutputFramePoolMetrics metrics;
+	metrics.capacity = mSlots.size();
+	metrics.readyCount = mReadySlots.size();
+	metrics.acquireMissCount = mAcquireMissCount;
+	metrics.readyUnderrunCount = mReadyUnderrunCount;
+
+	for (const StoredSlot& slot : mSlots)
+	{
+		switch (slot.state)
+		{
+		case OutputFrameSlotState::Free:
+			++metrics.freeCount;
+			break;
+		case OutputFrameSlotState::Rendering:
+			++metrics.renderingCount;
+			++metrics.acquiredCount;
+			break;
+		case OutputFrameSlotState::Completed:
+			++metrics.completedCount;
+			break;
+		case OutputFrameSlotState::Scheduled:
+			++metrics.scheduledCount;
+			break;
+		}
+	}
+
+	return metrics;
+}
+
+bool SystemOutputFramePool::IsValidSlotLocked(const OutputFrameSlot& slot) const
+{
+	return slot.index < mSlots.size() && mSlots[slot.index].generation == slot.generation;
+}
+
+bool SystemOutputFramePool::TransitionSlotLocked(const OutputFrameSlot& slot, OutputFrameSlotState expectedState, OutputFrameSlotState nextState)
+{
+	if (!IsValidSlotLocked(slot) || mSlots[slot.index].state != expectedState)
+		return false;
+
+	mSlots[slot.index].state = nextState;
+	return true;
+}
+
+void SystemOutputFramePool::FillOutputSlotLocked(std::size_t index, OutputFrameSlot& slot)
+{
+	StoredSlot& storedSlot = mSlots[index];
+	slot.index = index;
+	slot.generation = storedSlot.generation;
+	slot.frame.bytes = storedSlot.bytes.empty() ? nullptr : storedSlot.bytes.data();
+	slot.frame.rowBytes = static_cast<long>(mConfig.rowBytes);
+	slot.frame.width = mConfig.width;
+	slot.frame.height = mConfig.height;
+	slot.frame.pixelFormat = mConfig.pixelFormat;
+	slot.frame.nativeFrame = nullptr;
+	slot.frame.nativeBuffer = slot.frame.bytes;
+}
+
+void SystemOutputFramePool::RemoveReadyIndexLocked(std::size_t index)
+{
+	mReadySlots.erase(std::remove(mReadySlots.begin(), mReadySlots.end(), index), mReadySlots.end());
+}
+
+bool SystemOutputFramePool::ReleaseSlotByIndexLocked(std::size_t index)
+{
+	if (index >= mSlots.size() || mSlots[index].state == OutputFrameSlotState::Free)
+		return false;
+
+	RemoveReadyIndexLocked(index);
+	mSlots[index].state = OutputFrameSlotState::Free;
+	return true;
+}
+
+std::size_t SystemOutputFramePool::FrameByteCount() const
+{
+	return static_cast<std::size_t>(mConfig.rowBytes) * static_cast<std::size_t>(mConfig.height);
+}

apps/LoopThroughWithOpenGLCompositing/videoio/SystemOutputFramePool.h

@@ -0,0 +1,94 @@
+#pragma once
+
+#include "VideoIOTypes.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <deque>
+#include <mutex>
+#include <vector>
+
+enum class OutputFrameSlotState
+{
+	Free,
+	Rendering,
+	Completed,
+	Scheduled
+};
+
+struct SystemOutputFramePoolConfig
+{
+	unsigned width = 0;
+	unsigned height = 0;
+	VideoIOPixelFormat pixelFormat = VideoIOPixelFormat::Bgra8;
+	unsigned rowBytes = 0;
+	std::size_t capacity = 0;
+};
+
+struct OutputFrameSlot
+{
+	VideoIOOutputFrame frame;
+	std::size_t index = 0;
+	uint64_t generation = 0;
+};
+
+struct SystemOutputFramePoolMetrics
+{
+	std::size_t capacity = 0;
+	std::size_t freeCount = 0;
+	std::size_t renderingCount = 0;
+	std::size_t completedCount = 0;
+	std::size_t scheduledCount = 0;
+	std::size_t acquiredCount = 0;
+	std::size_t readyCount = 0;
+	std::size_t consumedCount = 0;
+	uint64_t acquireMissCount = 0;
+	uint64_t readyUnderrunCount = 0;
+};
+
+class SystemOutputFramePool
+{
+public:
+	SystemOutputFramePool() = default;
+	explicit SystemOutputFramePool(const SystemOutputFramePoolConfig& config);
+
+	void Configure(const SystemOutputFramePoolConfig& config);
+	SystemOutputFramePoolConfig Config() const;
+
+	bool AcquireFreeSlot(OutputFrameSlot& slot);
+	bool AcquireRenderingSlot(OutputFrameSlot& slot);
+	bool PublishReadySlot(const OutputFrameSlot& slot);
+	bool PublishCompletedSlot(const OutputFrameSlot& slot);
+	bool ConsumeReadySlot(OutputFrameSlot& slot);
+	bool ConsumeCompletedSlot(OutputFrameSlot& slot);
+	bool MarkScheduled(const OutputFrameSlot& slot);
+	bool MarkScheduledByBuffer(void* bytes);
+	bool ReleaseSlot(const OutputFrameSlot& slot);
+	bool ReleaseScheduledSlot(const OutputFrameSlot& slot);
+	bool ReleaseSlotByBuffer(void* bytes);
+	void Clear();
+
+	SystemOutputFramePoolMetrics GetMetrics() const;
+
+private:
+	struct StoredSlot
+	{
+		std::vector<unsigned char> bytes;
+		OutputFrameSlotState state = OutputFrameSlotState::Free;
+		uint64_t generation = 1;
+	};
+
+	bool IsValidSlotLocked(const OutputFrameSlot& slot) const;
+	bool TransitionSlotLocked(const OutputFrameSlot& slot, OutputFrameSlotState expectedState, OutputFrameSlotState nextState);
+	void FillOutputSlotLocked(std::size_t index, OutputFrameSlot& slot);
+	void RemoveReadyIndexLocked(std::size_t index);
+	bool ReleaseSlotByIndexLocked(std::size_t index);
+	std::size_t FrameByteCount() const;
+
+	mutable std::mutex mMutex;
+	SystemOutputFramePoolConfig mConfig;
+	std::vector<StoredSlot> mSlots;
+	std::deque<std::size_t> mReadySlots;
+	uint64_t mAcquireMissCount = 0;
+	uint64_t mReadyUnderrunCount = 0;
+};

apps/LoopThroughWithOpenGLCompositing/videoio/VideoBackend.h

@@ -0,0 +1,158 @@
+#pragma once
+
+#include "OutputProductionController.h"
+#include "RenderCadenceController.h"
+#include "RenderOutputQueue.h"
+#include "SystemOutputFramePool.h"
+#include "VideoBackendLifecycle.h"
+#include "VideoIOTypes.h"
+#include "VideoPlayoutPolicy.h"
+
+#include <chrono>
+#include <condition_variable>
+#include <cstdint>
+#include <deque>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <thread>
+
+class HealthTelemetry;
+class OpenGLVideoIOBridge;
+class RenderEngine;
+class RuntimeEventDispatcher;
+class VideoIODevice;
+
+class VideoBackend
+{
+public:
+	VideoBackend(RenderEngine& renderEngine, HealthTelemetry& healthTelemetry, RuntimeEventDispatcher& runtimeEventDispatcher);
+	~VideoBackend();
+
+	void ReleaseResources();
+	VideoBackendLifecycleState LifecycleState() const;
+	bool DiscoverDevicesAndModes(const VideoFormatSelection& videoModes, std::string& error);
+	bool SelectPreferredFormats(const VideoFormatSelection& videoModes, bool outputAlphaRequired, std::string& error);
+	bool ConfigureInput(const VideoFormat& inputVideoMode, std::string& error);
+	bool ConfigureOutput(const VideoFormat& outputVideoMode, bool externalKeyingEnabled, std::string& error);
+	bool Start();
+	bool Stop();
+
+	const VideoIOState& State() const;
+	VideoIOState& MutableState();
+	bool BeginOutputFrame(VideoIOOutputFrame& frame);
+	void EndOutputFrame(VideoIOOutputFrame& frame);
+	bool ScheduleOutputFrame(const VideoIOOutputFrame& frame);
+	VideoPlayoutRecoveryDecision AccountForCompletionResult(VideoIOCompletionResult result, uint64_t readyQueueDepth);
+	void RecordBackendPlayoutHealth(VideoIOCompletionResult result, const VideoPlayoutRecoveryDecision& recoveryDecision);
+
+	bool HasInputDevice() const;
+	bool HasInputSource() const;
+	unsigned InputFrameWidth() const;
+	unsigned InputFrameHeight() const;
+	unsigned OutputFrameWidth() const;
+	unsigned OutputFrameHeight() const;
+	unsigned CaptureTextureWidth() const;
+	unsigned OutputPackTextureWidth() const;
+	VideoIOPixelFormat InputPixelFormat() const;
+	const std::string& InputDisplayModeName() const;
+	const std::string& OutputModelName() const;
+	bool SupportsInternalKeying() const;
+	bool SupportsExternalKeying() const;
+	bool KeyerInterfaceAvailable() const;
+	bool ExternalKeyingActive() const;
+	const std::string& StatusMessage() const;
+	bool ShouldPrioritizeOutputOverPreview() const;
+	void SetStatusMessage(const std::string& message);
+	void PublishStatus(bool externalKeyingConfigured, const std::string& statusMessage = std::string());
+	void ReportNoInputDeviceSignalStatus();
+
+private:
+	void HandleInputFrame(const VideoIOFrame& frame);
+	void HandleOutputFrameCompletion(const VideoIOCompletion& completion);
+	void StartOutputCompletionWorker();
+	void StopOutputCompletionWorker();
+	void OutputCompletionWorkerMain();
+	void StartOutputProducerWorker();
+	void StopOutputProducerWorker();
+	void OutputProducerWorkerMain();
+	void NotifyOutputProducer();
+	std::chrono::milliseconds OutputProducerWakeInterval() const;
+	void ProcessOutputFrameCompletion(const VideoIOCompletion& completion);
+	std::size_t ProduceReadyOutputFrames(const VideoIOCompletion& completion, std::size_t maxFrames);
+	OutputProductionPressure BuildOutputProductionPressure(const RenderOutputQueueMetrics& metrics) const;
+	bool RenderReadyOutputFrame(const VideoIOState& state, const VideoIOCompletion& completion);
+	std::size_t ScheduleReadyOutputFramesToTarget();
+	bool ScheduleReadyOutputFrame();
+	bool ScheduleBlackUnderrunFrame();
+	void RecordFramePacing(VideoIOCompletionResult completionResult);
+	void RecordReadyQueueDepthSample(const RenderOutputQueueMetrics& metrics);
+	void RecordDeckLinkBufferTelemetry();
+	void RecordSystemMemoryPlayoutStats();
+	void RecordOutputRenderDuration(double renderMilliseconds, double acquireMilliseconds, double renderRequestMilliseconds, double endAccessMilliseconds);
+	bool ApplyLifecycleTransition(VideoBackendLifecycleState state, const std::string& message);
+	bool ApplyLifecycleFailure(const std::string& message);
+	void PublishBackendStateChanged(const std::string& state, const std::string& message);
+	void PublishInputSignalChanged(const VideoIOFrame& frame, const VideoIOState& state);
+	void PublishInputFrameArrived(const VideoIOFrame& frame);
+	void PublishOutputFrameScheduled(const VideoIOOutputFrame& frame);
+	void PublishOutputFrameCompleted(const VideoIOCompletion& completion);
+	void PublishTimingSample(const std::string& subsystem, const std::string& metric, double value, const std::string& unit);
+	static std::string CompletionResultName(VideoIOCompletionResult result);
+	static std::string PixelFormatName(VideoIOPixelFormat pixelFormat);
+
+	HealthTelemetry& mHealthTelemetry;
+	RuntimeEventDispatcher& mRuntimeEventDispatcher;
+	VideoBackendLifecycle mLifecycle;
+	VideoPlayoutPolicy mPlayoutPolicy;
+	OutputProductionController mOutputProductionController;
+	RenderCadenceController mRenderCadenceController;
+	RenderOutputQueue mReadyOutputQueue;
+	SystemOutputFramePool mSystemOutputFramePool;
+	std::unique_ptr<VideoIODevice> mVideoIODevice;
+	std::unique_ptr<OpenGLVideoIOBridge> mBridge;
+	std::mutex mOutputCompletionMutex;
+	std::condition_variable mOutputCompletionCondition;
+	std::deque<VideoIOCompletion> mPendingOutputCompletions;
+	std::thread mOutputCompletionWorker;
+	std::mutex mOutputProducerMutex;
+	std::condition_variable mOutputProducerCondition;
+	std::thread mOutputProducerWorker;
+	VideoIOCompletion mLastOutputProductionCompletion;
+	std::chrono::steady_clock::time_point mLastOutputProductionTime;
+	std::mutex mOutputProductionMutex;
+	std::mutex mOutputSchedulingMutex;
+	mutable std::mutex mOutputMetricsMutex;
+	bool mOutputCompletionWorkerRunning = false;
+	bool mOutputCompletionWorkerStopping = false;
+	bool mOutputProducerWorkerRunning = false;
+	bool mOutputProducerWorkerStopping = false;
+	uint64_t mNextReadyOutputFrameIndex = 0;
+	uint64_t mInputFrameIndex = 0;
+	uint64_t mOutputFrameScheduleIndex = 0;
+	uint64_t mOutputFrameCompletionIndex = 0;
+	bool mHasLastInputSignal = false;
+	bool mLastInputSignal = false;
+	unsigned mLastInputSignalWidth = 0;
+	unsigned mLastInputSignalHeight = 0;
+	std::string mLastInputSignalModeName;
+	std::chrono::steady_clock::time_point mLastPlayoutCompletionTime;
+	double mCompletionIntervalMilliseconds = 0.0;
+	double mSmoothedCompletionIntervalMilliseconds = 0.0;
+	double mMaxCompletionIntervalMilliseconds = 0.0;
+	bool mHasReadyQueueDepthBaseline = false;
+	std::size_t mMinReadyQueueDepth = 0;
+	std::size_t mMaxReadyQueueDepth = 0;
+	uint64_t mReadyQueueZeroDepthCount = 0;
+	double mOutputRenderMilliseconds = 0.0;
+	double mSmoothedOutputRenderMilliseconds = 0.0;
+	double mMaxOutputRenderMilliseconds = 0.0;
+	double mOutputFrameAcquireMilliseconds = 0.0;
+	double mOutputFrameRenderRequestMilliseconds = 0.0;
+	double mOutputFrameEndAccessMilliseconds = 0.0;
+	uint64_t mLastLateStreak = 0;
+	uint64_t mLastDropStreak = 0;
+	uint64_t mLateFrameCount = 0;
+	uint64_t mDroppedFrameCount = 0;
+	uint64_t mFlushedFrameCount = 0;
+};

apps/LoopThroughWithOpenGLCompositing/videoio/VideoBackendLifecycle.cpp

@@ -0,0 +1,123 @@
+#include "VideoBackendLifecycle.h"
+
+VideoBackendLifecycleState VideoBackendLifecycle::State() const
+{
+	return mState;
+}
+
+const std::string& VideoBackendLifecycle::FailureReason() const
+{
+	return mFailureReason;
+}
+
+VideoBackendLifecycleTransition VideoBackendLifecycle::TransitionTo(VideoBackendLifecycleState next, const std::string& reason)
+{
+	VideoBackendLifecycleTransition transition;
+	transition.previous = mState;
+	transition.current = next;
+	transition.reason = reason;
+	transition.accepted = CanTransition(mState, next);
+	if (!transition.accepted)
+	{
+		transition.current = mState;
+		transition.errorMessage = std::string("Invalid video backend lifecycle transition from ") +
+			StateName(mState) + " to " + StateName(next) + ".";
+		return transition;
+	}
+
+	mState = next;
+	transition.current = mState;
+	if (mState != VideoBackendLifecycleState::Failed)
+		mFailureReason.clear();
+	return transition;
+}
+
+VideoBackendLifecycleTransition VideoBackendLifecycle::Fail(const std::string& reason)
+{
+	VideoBackendLifecycleTransition transition = TransitionTo(VideoBackendLifecycleState::Failed, reason);
+	if (transition.accepted)
+		mFailureReason = reason;
+	return transition;
+}
+
+bool VideoBackendLifecycle::CanTransition(VideoBackendLifecycleState current, VideoBackendLifecycleState next)
+{
+	if (current == next)
+		return true;
+
+	switch (current)
+	{
+	case VideoBackendLifecycleState::Uninitialized:
+		return next == VideoBackendLifecycleState::Discovering ||
+			next == VideoBackendLifecycleState::Stopped ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Discovering:
+		return next == VideoBackendLifecycleState::Discovered ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Discovered:
+		return next == VideoBackendLifecycleState::Configuring ||
+			next == VideoBackendLifecycleState::Stopped ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Configuring:
+		return next == VideoBackendLifecycleState::Configured ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Configured:
+		return next == VideoBackendLifecycleState::Prerolling ||
+			next == VideoBackendLifecycleState::Stopped ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Prerolling:
+		return next == VideoBackendLifecycleState::Running ||
+			next == VideoBackendLifecycleState::Stopping ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Running:
+		return next == VideoBackendLifecycleState::Degraded ||
+			next == VideoBackendLifecycleState::Stopping ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Degraded:
+		return next == VideoBackendLifecycleState::Running ||
+			next == VideoBackendLifecycleState::Stopping ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Stopping:
+		return next == VideoBackendLifecycleState::Stopped ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Stopped:
+		return next == VideoBackendLifecycleState::Discovering ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Failed:
+		return next == VideoBackendLifecycleState::Stopped ||
+			next == VideoBackendLifecycleState::Discovering;
+	default:
+		return false;
+	}
+}
+
+const char* VideoBackendLifecycle::StateName(VideoBackendLifecycleState state)
+{
+	switch (state)
+	{
+	case VideoBackendLifecycleState::Uninitialized:
+		return "uninitialized";
+	case VideoBackendLifecycleState::Discovering:
+		return "discovering";
+	case VideoBackendLifecycleState::Discovered:
+		return "discovered";
+	case VideoBackendLifecycleState::Configuring:
+		return "configuring";
+	case VideoBackendLifecycleState::Configured:
+		return "configured";
+	case VideoBackendLifecycleState::Prerolling:
+		return "prerolling";
+	case VideoBackendLifecycleState::Running:
+		return "running";
+	case VideoBackendLifecycleState::Degraded:
+		return "degraded";
+	case VideoBackendLifecycleState::Stopping:
+		return "stopping";
+	case VideoBackendLifecycleState::Stopped:
+		return "stopped";
+	case VideoBackendLifecycleState::Failed:
+		return "failed";
+	default:
+		return "unknown";
+	}
+}