aiden/video-shader-toys
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Shader test past
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Aiden
2026-05-12 02:08:48 +10:00
parent e0ca548ef5
commit 4ea829af85
11 changed files with 534 additions and 7 deletions
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20
apps/RenderCadenceCompositor/README.md
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@@ -37,6 +37,8 @@ Included now:
- async PBO readback
- latest-N system-memory frame exchange
- rendered-frame warmup
- background Slang compile of `shaders/happy-accident`
- render-thread-only GL commit once compiled shader source is ready
- compact telemetry
- non-GL frame-exchange tests
@@ -85,7 +87,7 @@ Press Enter to stop.
The app prints one line per second:
```text
renderFps=59.9 scheduleFps=59.9 free=7 completed=1 scheduled=4 completedPollMisses=0 scheduleFailures=0 completions=119 late=0 dropped=0 decklinkBuffered=4 scheduleCallMs=0.0
renderFps=59.9 scheduleFps=59.9 free=7 completed=1 scheduled=4 completedPollMisses=0 scheduleFailures=0 completions=119 late=0 dropped=0 shaderCommitted=1 shaderFailures=0 decklinkBuffered=4 scheduleCallMs=0.0
```
Healthy first-run signs:
@@ -97,9 +99,25 @@ Healthy first-run signs:
- `decklinkBuffered` stays near 4 when available
- `late` and `dropped` do not increase continuously
- `scheduleFailures` does not increase
- `shaderCommitted` becomes `1` after the background Happy Accident compile completes
- `shaderFailures` remains `0`
`completedPollMisses` means the DeckLink scheduling thread woke up before a completed frame was available. It is not a DeckLink playout underrun by itself. Treat it as healthy polling noise when `scheduled`, `decklinkBuffered`, `late`, `dropped`, and `scheduleFailures` remain stable.
## Runtime Slang Shader Test
On startup the app begins compiling `shaders/happy-accident` on a background thread.
The render thread keeps drawing the simple motion renderer while Slang compiles. It only attempts the OpenGL shader compile/link once a complete GLSL fragment shader is ready. If either the Slang build or GL commit fails, the app keeps rendering the simple motion fallback.
Successful handoff signs:
- console prints `Runtime shader committed: happy-accident`
- telemetry shows `shaderCommitted=1`
- output changes from the simple motion pattern to the Happy Accident shader
- render/schedule cadence remains near 60 fps during and after the handoff
- DeckLink buffer remains stable
## Baseline Result
Date: 2026-05-12