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softgpu: Correct alpha blend subtract on negative.

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Oops, we need to subtract signed, but then clamp to unsigned.
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Unknown W. Brackets 2021-11-25 22:06:48 -08:00
parent dad85b97f1
commit ce5ae95854
1 changed files with 2 additions and 2 deletions
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4
GPU/Software/Rasterizer.cpp
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@ -507,7 +507,7 @@ Vec3<int> AlphaBlendingResult(const PixelFuncID &pixelID, const Vec4<int> &sourc
const __m128i df = _mm_add_epi16(_mm_slli_epi16(_mm_packs_epi32(dstfactor.ivec, dstfactor.ivec), 4), half);
const __m128i d = _mm_mulhi_epi16(drgb, df);
return Vec3<int>(_mm_unpacklo_epi16(_mm_subs_epi16(s, d), _mm_setzero_si128()));
return Vec3<int>(_mm_unpacklo_epi16(_mm_max_epi16(_mm_subs_epi16(s, d), _mm_setzero_si128()), _mm_setzero_si128()));
#else
Vec3<int> half = Vec3<int>::AssignToAll(1);
Vec3<int> lhs = ((source.rgb() * 2 + half) * (srcfactor * 2 + half)) / 1024;
@ -529,7 +529,7 @@ Vec3<int> AlphaBlendingResult(const PixelFuncID &pixelID, const Vec4<int> &sourc
const __m128i df = _mm_add_epi16(_mm_slli_epi16(_mm_packs_epi32(dstfactor.ivec, dstfactor.ivec), 4), half);
const __m128i d = _mm_mulhi_epi16(drgb, df);
return Vec3<int>(_mm_unpacklo_epi16(_mm_subs_epi16(d, s), _mm_setzero_si128()));
return Vec3<int>(_mm_unpacklo_epi16(_mm_max_epi16(_mm_subs_epi16(d, s), _mm_setzero_si128()), _mm_setzero_si128()));
#else
Vec3<int> half = Vec3<int>::AssignToAll(1);
Vec3<int> lhs = ((source.rgb() * 2 + half) * (srcfactor * 2 + half)) / 1024;