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Use the same logic for lerp bias for color and alpha

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It doesn't make sense for alpha to add the bias ONLY when dividing by 2, while color doesn't apply the bias for divide by 2 only; hardware testing indicates that alpha should have the bias.

This fixes the menus in Mario Kart Wii (https://bugs.dolphin-emu.org/issues/11909) but reintroduces the white rectangle in Fortune Street.

This reverts commit 5aaa5141ed (and several other matching changes elsewhere).
This commit is contained in:
Pokechu22 2022-01-24 22:05:31 -08:00
parent b4c7f2b1e8
commit 0327e6acb4
3 changed files with 25 additions and 21 deletions
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2
Source/Core/VideoBackends/Software/Tev.cpp
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@ -297,7 +297,7 @@ void Tev::DrawAlphaRegular(const TevStageCombiner::AlphaCombiner& ac, const Inpu
s32 temp = InputReg.a * (256 - c) + (InputReg.b * c);
temp <<= m_ScaleLShiftLUT[u32(ac.scale.Value())];
temp += (ac.scale != TevScale::Divide2) ? 0 : (ac.op == TevOp::Sub) ? 127 : 128;
temp += (ac.scale == TevScale::Divide2) ? 0 : (ac.op == TevOp::Sub) ? 127 : 128;
temp = ac.op == TevOp::Sub ? (-temp >> 8) : (temp >> 8);
s32 result =