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docs: mark Phase 3c (raster GPU cache bound) done

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Skyler Lehmkuhl 2026-06-20 19:15:23 -04:00
parent 17d7395229
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STREAMING_TO_DISK_PLAN.md
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@ -348,11 +348,13 @@ clone). Not worth 64 edits. Start at 3a.
rows via `media_exists` (no data loss) and walks all layers to match load.
*(Refinement deferred: count budget → byte budget for 4K resolution-robustness.)*
### 3c. Bound the GPU cache
`raster_layer_cache` (`gpu_brush.rs:1051`, `HashMap<Uuid,CanvasPair>`, Rgba16Float ping-pong
≈ `w·h·16`/entry, **unbounded**) → evict textures for keyframes outside every layer's window
(drive from the same pass) / LRU byte budget. Export `raster_cache` (`video_exporter.rs:85`) lives
one export — bound trivially. (Vello `ImageCache` is image *assets* → Phase 4.)
### 3c. Bound the GPU cache **[DONE for raster_layer_cache]**
`raster_layer_cache` (`gpu_brush.rs`, `HashMap<Uuid,CanvasPair>`, Rgba16Float ping-pong
≈ `w·h·16`/entry, was **unbounded**) → recency LRU (`RASTER_LAYER_CACHE_MAX = 12`) in
`ensure_layer_texture`: bump-to-most-recent + evict oldest; shown frames protected. F3 overlay
now shows tracked VRAM (raster cache MB + count). *(Refinements: count→byte budget; raise/headroom
if >12 raster layers are visible at once. Export `raster_cache` lives one export — fine. Vello
`ImageCache` is image *assets* → Phase 4.)*
### 3d. Undo memory
`RasterStrokeAction`/`RasterFillAction` hold `buffer_before`+`buffer_after` full frames