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GPU: Convert alphamask to FF/00 for 5551.

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When masking via uniform, we don't care about the lower bits of alpha.
Games often use 7F / 80 to control writes of FF/00.
This commit is contained in:
Unknown W. Brackets 2022-11-12 17:30:00 -08:00
parent 945288f4b5
commit 98758573e3
1 changed files with 9 additions and 0 deletions
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9
GPU/Common/GPUStateUtils.cpp
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@ -1070,6 +1070,15 @@ static void ConvertMaskState(GenericMaskState &maskState, bool shaderBitOpsSuppo
maskState.channelMask &= ~8;
maskState.uniformMask &= ~0xFF000000;
}
// For 5551, only the top alpha bit matters. We might even want to swizzle 4444.
// Alpha should correctly read as 255 from a 5551 texture.
if (gstate.FrameBufFormat() == GE_FORMAT_5551) {
if ((maskState.uniformMask & 0x80000000) != 0)
maskState.uniformMask |= 0xFF000000;
else
maskState.uniformMask &= ~0xFF000000;
}
}
// Called even if AlphaBlendEnable == false - it also deals with stencil-related blend state.