perf(runner): pre-light water textures to drop the per-pixel colormap - #22
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Water/lava/slime ('*') surfaces render at a fixed light level (0) with only a
UV warp -- the texture itself never changes. So pre-light each source texture
once through the colormap (cm.LightIndex(0, texel)), cache it by source Pic,
and draw the turbulent fill with cm=nil, which skips the per-pixel colormap
lookup. The baked image is bit-identical (same cm[0][texel]); verified
in-browser (lq_e0m1), the water renders unchanged.
Adds a turbulent-fill benchmark showing the pre-lit path is ~7% faster on a
~250k-px water quad (519us vs 557us). It is a modest win -- the colormap is
one of ~10 per-pixel ops; the dominant cost is the intrinsic sin-LUT warp --
but it is free and zero-risk (no render-package change, no visual change).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Water/lava/slime (
*) surfaces render at a fixed light level (0) with only a UV warp — the texture itself never changes. So pre-light each source texture once through the colormap (cm.LightIndex(0, texel)), cache it by sourcePic, and draw the turbulent fill withcm=nil, skipping the per-pixel colormap lookup.cm[0][texel]); verified in-browser (lq_e0m1) — water renders unchanged.A modest win — the colormap is one of ~10 per-pixel ops; the dominant turbulent cost is the intrinsic sin-LUT warp — but it's free and zero-risk (no render-package change, no visual change). Confirms per-pixel water is near-exhausted like the lightmapped fill; the remaining big lever is overdraw reduction.
🤖 Generated with Claude Code