Step 3 of #6916. Dehaze, Clarity and Texture run as fragment passes
(box, minimum and guided filters) around step 2's Shadows and
Highlights, so every setting but Detail develops on the GPU with one
readback.
- algo: camera_raw::spatial resolves Dehaze, Clarity and Texture per
frame; develop builds them the same way (130 output hashes unchanged,
same speed). PerPixel gains the three stages, per_pixel() refuses only
Detail, and Whites/Blacks are measured after any spatial stage.
- gpu: camera_raw_filters.wgsl; the tone frame's pyramid is made on
demand; plans record four segments around the main shader's passes.
Dehaze's light uses two exact selections (cutoff value, then cutoff
index among its ties). Its <=768 px copy comes from the CPU
(Dehaze::cells, develop's own code), cached per source and white
balance: on WARP the GPU's copy split CPU ties at the cutoff and moved
the light by 5.7e-3.
- GPU vs CPU at most 7.6e-5 (Vulkan, DX12, WARP), tolerance 1/4096.
858x572: Dehaze +40 6.0 ms vs 29 ms, Clarity +50 3.5 vs 16 ms,
Texture +50 3.4 vs 10 ms, everything 19 ms vs 650-690 ms (Vulkan).
Part of #6916.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
fjamespriceandClaude Opus 5.5
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