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ac05d1a593
This no longer converts from sRGB to linear for the reference mip downsample - even if the original mipmap creation tool used an sRGB colorspace (which isn't really guaranteed, and may even change per game), this is a "fast" heuristic that's only an estimate anyway. The average diff is also now stored in a u64, avoiding floating point calculations in the per-pixel hot loop. This should speed up the detection significantly, hopefully fixing jank when loading in new textures.