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fix: Rebuild gsplat work buffer render targets for runtime-added streams - #9876
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…at runtime GSplatWorkBuffer.syncWithFormat() compared the streams' format version before and after its own sync. GSplatStreams.getTexture() also syncs, so when a texture was fetched by name after a stream was added, the streams were already up to date and the render targets were never rebuilt. The new stream then had a texture but no attachment, and the copy pass never wrote it. Track the version the render targets were built for and rebuild whenever it is behind. Extracted from #9873. Co-authored-by: Donovan Hutchence <slimbuck7@gmail.com>
Build size reportThis PR changes the size of the minified bundles.
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No active review issues are recorded for the fix to render-target attachments for runtime-added gsplat streams.
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What changed in this PR
Fixes missing render-target attachments for runtime-added gsplat streams on the GPU-sort path, including when a texture lookup has already synchronized the streams.
Changes:
- Tracks the stream version used to create render targets and rebuilds them when it changes.
- Adds regression tests for runtime-added streams, both with and without a preceding
getTexture()call.
| File | Description |
|---|---|
test/scene/gsplat-unified/gsplat-work-buffer.test.mjs |
Tests that runtime-added streams receive render-target attachments. |
src/scene/gsplat-unified/gsplat-work-buffer.js |
Tracks render-target versions independently of stream synchronization. |
Review effort: Balanced
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mvaligursky
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Oct 30, 2026
The fix landed separately in playcanvas#9876 with its own test.
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Fixes a gsplat work buffer bug where a stream added at runtime never got a render target attachment, so the copy pass never wrote it. Extracted from #9873.
Changes:
GSplatWorkBuffer.syncWithFormat()compared the streams' format version before and after its own sync.GSplatStreams.getTexture()also syncs the streams, so when a renderer fetched a texture by name after the stream was added, the streams were already up to date and the render targets were never rebuilt. The new stream then had a texture but no attachment. This affects any extra stream added at runtime (app.scene.gsplat.format.addExtraStreams()) on the GPU-sort path.test/scene/gsplat-unified/gsplat-work-buffer.test.mjs.