GS-hw: Apply clamp/wrap when FBMask enabled #5514
Merged
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Description of Changes
Make sure any clamps (but most importantly 16bit colour masking) gets applied when FBMask is used.
Rationale behind Changes
16 bit colours were incorrectly masked when FBMask was enabled, due to changes in #5471 it kind of made the problem rise to the surface and caused errors on Silent Hill 4, noticeable in the subway.
Suggested Testing Steps
Test games which use 16bit colours (you can usually tell because they use Dithering)