[Bug 39014] Multiple games render pink artifacts (O2Jam, Stranded II, SpaceRace)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=39014

--- Comment #16 from Stefan Dösinger <stefan at codeweavers.com> ---
Created attachment 52058
  --> https://bugs.winehq.org/attachment.cgi?id=52058
Don't require an exact color key match

The O2Jam problem seems to be a precision issue. The game uses an R5G6B5
texture, and the color key is 31/20/31, which translates to r=1.0, g=20/63,
b=1.0. The rounding of the green value is different between our color key
calculation and the normalization during texture sampling, causing the key not
to match.

The attached patch allows a small mismatch, which seems to fix the game. We
need some tests for this though to make sure we're not matching keys we
shouldn't match, and we need the same change in the ARB and GLSL fixed function
fragment shader.

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