Pacing problems

apps/LoopThroughWithOpenGLCompositing/gl/OpenGLComposite.cpp

@@ -53,12 +53,17 @@
 
 #include <memory>
 #include <string>
+#include <thread>
 #include <vector>
 
 OpenGLComposite::OpenGLComposite(HWND hWnd, HDC hDC, HGLRC hRC) :
 	hGLWnd(hWnd), hGLDC(hDC), hGLRC(hRC),
 	mDeckLink(std::make_unique<DeckLinkSession>()),
-	mRenderer(std::make_unique<OpenGLRenderer>())
+	mRenderer(std::make_unique<OpenGLRenderer>()),
+	mRuntimePollRunning(false),
+	mRuntimeRegistryChanged(false),
+	mRuntimeReloadRequested(false),
+	mRuntimePollFailed(false)
 {
 	InitializeCriticalSection(&pMutex);
 	mRuntimeHost = std::make_unique<RuntimeHost>();
@@ -79,6 +84,7 @@ OpenGLComposite::OpenGLComposite(HWND hWnd, HDC hDC, HGLRC hRC) :
 
 OpenGLComposite::~OpenGLComposite()
 {
+	StopRuntimePolling();
 	mDeckLink->ReleaseResources();
 	mRenderer->DestroyResources();
 	if (mOscServer)
@@ -284,6 +290,7 @@ bool OpenGLComposite::InitOpenGLState()
 	}
 
 	broadcastRuntimeState();
+	StartRuntimePolling();
 	return true;
 }
 
@@ -305,6 +312,8 @@ bool OpenGLComposite::Start()
 
 bool OpenGLComposite::Stop()
 {
+	StopRuntimePolling();
+
 	if (mOscServer)
 		mOscServer->Stop();
 
@@ -351,10 +360,17 @@ bool OpenGLComposite::ReloadShader()
 
 void OpenGLComposite::renderEffect()
 {
-	PollRuntimeChanges();
+	ProcessRuntimePollResults();
 
 	const bool hasInputSource = mDeckLink->HasInputSource();
-	const std::vector<RuntimeRenderState> layerStates = mRuntimeHost ? mRuntimeHost->GetLayerRenderStates(mDeckLink->InputFrameWidth(), mDeckLink->InputFrameHeight()) : std::vector<RuntimeRenderState>();
+	std::vector<RuntimeRenderState> layerStates;
+	if (mRuntimeHost)
+	{
+		if (mRuntimeHost->TryGetLayerRenderStates(mDeckLink->InputFrameWidth(), mDeckLink->InputFrameHeight(), layerStates))
+			mCachedLayerRenderStates = layerStates;
+		else
+			layerStates = mCachedLayerRenderStates;
+	}
 	const unsigned historyCap = mRuntimeHost ? mRuntimeHost->GetMaxTemporalHistoryFrames() : 0;
 	mRenderPass->Render(
 		hasInputSource,
@@ -370,25 +386,72 @@ void OpenGLComposite::renderEffect()
 		});
 }
 
-bool OpenGLComposite::PollRuntimeChanges()
+void OpenGLComposite::StartRuntimePolling()
+{
+	if (!mRuntimeHost || mRuntimePollRunning.exchange(true))
+		return;
+
+	mRuntimePollThread = std::thread([this]() { RuntimePollLoop(); });
+}
+
+void OpenGLComposite::StopRuntimePolling()
+{
+	if (!mRuntimePollRunning.exchange(false))
+		return;
+
+	if (mRuntimePollThread.joinable())
+		mRuntimePollThread.join();
+}
+
+void OpenGLComposite::RuntimePollLoop()
+{
+	while (mRuntimePollRunning)
+	{
+		bool registryChanged = false;
+		bool reloadRequested = false;
+		std::string runtimeError;
+		if (!mRuntimeHost->PollFileChanges(registryChanged, reloadRequested, runtimeError))
+		{
+			{
+				std::lock_guard<std::mutex> lock(mRuntimePollErrorMutex);
+				mRuntimePollError = runtimeError;
+			}
+			mRuntimePollFailed = true;
+		}
+		else
+		{
+			if (registryChanged)
+				mRuntimeRegistryChanged = true;
+			if (reloadRequested)
+				mRuntimeReloadRequested = true;
+		}
+
+		for (int i = 0; i < 25 && mRuntimePollRunning; ++i)
+			Sleep(10);
+	}
+}
+
+bool OpenGLComposite::ProcessRuntimePollResults()
 {
 	if (!mRuntimeHost)
 		return true;
 
-	bool registryChanged = false;
-	bool reloadRequested = false;
-	std::string runtimeError;
-	if (!mRuntimeHost->PollFileChanges(registryChanged, reloadRequested, runtimeError))
+	if (mRuntimePollFailed.exchange(false))
 	{
+		std::string runtimeError;
+		{
+			std::lock_guard<std::mutex> lock(mRuntimePollErrorMutex);
+			runtimeError = mRuntimePollError;
+		}
 		mRuntimeHost->SetCompileStatus(false, runtimeError);
 		broadcastRuntimeState();
 		return false;
 	}
 
-	if (registryChanged)
+	if (mRuntimeRegistryChanged.exchange(false))
 		broadcastRuntimeState();
 
-	if (!reloadRequested)
+	if (!mRuntimeReloadRequested.exchange(false))
 		return true;
 
 	char compilerErrorMessage[1024] = {};

apps/LoopThroughWithOpenGLCompositing/gl/OpenGLComposite.h

@@ -60,6 +60,9 @@
 #include <functional>
 #include <map>
 #include <memory>
+#include <mutex>
+#include <string>
+#include <thread>
 #include <vector>
 #include <deque>
 
@@ -119,10 +122,21 @@ private:
 	std::unique_ptr<OpenGLShaderPrograms>	mShaderPrograms;
 	std::unique_ptr<ControlServer>			mControlServer;
 	std::unique_ptr<OscServer>				mOscServer;
+	std::thread								mRuntimePollThread;
+	std::atomic<bool>						mRuntimePollRunning;
+	std::atomic<bool>						mRuntimeRegistryChanged;
+	std::atomic<bool>						mRuntimeReloadRequested;
+	std::atomic<bool>						mRuntimePollFailed;
+	std::mutex								mRuntimePollErrorMutex;
+	std::string								mRuntimePollError;
+	std::vector<RuntimeRenderState>			mCachedLayerRenderStates;
 
 	bool InitOpenGLState();
 	void renderEffect();
-	bool PollRuntimeChanges();
+	void StartRuntimePolling();
+	void StopRuntimePolling();
+	void RuntimePollLoop();
+	bool ProcessRuntimePollResults();
 	void broadcastRuntimeState();
 	void resetTemporalHistoryState();
 };

apps/LoopThroughWithOpenGLCompositing/gl/OpenGLDeckLinkBridge.cpp

@@ -52,7 +52,7 @@ void OpenGLDeckLinkBridge::RecordFramePacing(BMDOutputFrameCompletionResult comp
 	else if (completionResult == bmdOutputFrameFlushed)
 		++mFlushedFrameCount;
 
-	mRuntimeHost.SetFramePacingStats(
+	mRuntimeHost.TrySetFramePacingStats(
 		mCompletionIntervalMilliseconds,
 		mSmoothedCompletionIntervalMilliseconds,
 		mMaxCompletionIntervalMilliseconds,
@@ -64,7 +64,7 @@ void OpenGLDeckLinkBridge::RecordFramePacing(BMDOutputFrameCompletionResult comp
 void OpenGLDeckLinkBridge::VideoFrameArrived(IDeckLinkVideoInputFrame* inputFrame, bool hasNoInputSource)
 {
 	mDeckLink.SetInputSourceMissing(hasNoInputSource);
-	mRuntimeHost.SetSignalStatus(!hasNoInputSource, mDeckLink.InputFrameWidth(), mDeckLink.InputFrameHeight(), mDeckLink.InputDisplayModeName());
+	mRuntimeHost.TrySetSignalStatus(!hasNoInputSource, mDeckLink.InputFrameWidth(), mDeckLink.InputFrameHeight(), mDeckLink.InputDisplayModeName());
 
 	if (!mDeckLink.HasInputSource())
 		return;							// don't transfer texture when there's no input
@@ -147,8 +147,8 @@ void OpenGLDeckLinkBridge::PlayoutFrameCompleted(IDeckLinkVideoFrame* completedF
 	const auto renderEndTime = std::chrono::steady_clock::now();
 	const double frameBudgetMilliseconds = mDeckLink.FrameBudgetMilliseconds();
 	const double renderMilliseconds = std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(renderEndTime - renderStartTime).count();
-	mRuntimeHost.SetPerformanceStats(frameBudgetMilliseconds, renderMilliseconds);
-	mRuntimeHost.AdvanceFrame();
+	mRuntimeHost.TrySetPerformanceStats(frameBudgetMilliseconds, renderMilliseconds);
+	mRuntimeHost.TryAdvanceFrame();
 
 	IDeckLinkVideoBuffer* outputVideoFrameBuffer;
 	if (outputVideoFrame->QueryInterface(IID_IDeckLinkVideoBuffer, (void**)&outputVideoFrameBuffer) != S_OK)