Jonathan Hamilton ac05d1a593 Do all arbitrary mipmap detection in integer space ...

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.

2018-07-02 09:52:15 -07:00

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