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GPU5: Video Limiter on the GPU compositor (#30)

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Move Video Limiter from CPU (crates/render/src/vfx/color.rs) to the GPU
compositor (filmcraft_render::gpufx::FxOp, crates/gpu/src/fx.rs, crates/gpu/src/fx.wgsl).
Parity matches CPU reference within 9.28e-6 across all axis modes, clip levels,
compressions, and gamut warning color.

🤖 Written by agy (Antigravity Agent, Gemini 3.8 Flash)
This commit is contained in:
Manuel Camacho
2026-10-09 06:18:17 -07:00
parent d2b608605e
commit ab334b2adf
8 changed files with 249 additions and 84 deletions
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docs/architecture.md
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@@ -283,7 +283,7 @@ file ──► codecs (MP4/MOV, MKV, audio) demux + decode, GOP-aware see
Balance, Leave Color, Change to Color, Color Pass, Color Replace, Channel Mix, ASC CDL, Gamma
Correction, Levels, Extract, Invert, Posterize, Alpha Adjust, Gaussian Blur and Directional Blur
(and their legacy aliases), Camera Blur, Sharpen, Unsharp Mask, Crop, Edge Feather, Transform,
Horizontal / Vertical Flip, Mirror, Offset and Vignette. When every enabled effect of a media clip is in
Horizontal / Vertical Flip, Mirror, Offset, Vignette and Video Limiter. When every enabled effect of a media clip is in
that set (unmasked, with finite parameters, and no Transform shrinking the picture below half
size, which the CPU pre-filters), the plan hands the GPU the clip's source with
the effects' parameters evaluated at that time: the source is drawn into an `Rgba32Float`