softgpu: Optimize rectangle sampling/blending used in bloom #16094
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This happens in Ridge Racer, and we can entirely skip the color test.
Sometimes the vertex color or alpha can allow us to optimize away some multiplication.
Sometimes used by blends used purely to multiply the source color by something, usually prep for bloom.
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These are fairly small gains but they help us skip steps in larger draws and bloom situations. Only gives a percent or so, but I think worth it.
-[Unknown]