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Software: clamp inverse factors to zero.

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Just to make sure we don't end up with negative factors when
adding/subtracting/etc.
This commit is contained in:
Unknown W. Brackets 2015-11-19 06:48:37 -08:00
parent c22953a4b9
commit c90559262b
1 changed files with 5 additions and 5 deletions
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10
GPU/Software/Rasterizer.cpp
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@ -830,14 +830,13 @@ static inline Vec3<int> GetSourceFactor(const Vec4<int>& source, const Vec4<int>
return Vec3<int>::AssignToAll(2 * source.a());
case GE_SRCBLEND_DOUBLEINVSRCALPHA:
return Vec3<int>::AssignToAll(255 - 2 * source.a());
return Vec3<int>::AssignToAll(255 - std::min(2 * source.a(), 255));
case GE_SRCBLEND_DOUBLEDSTALPHA:
return Vec3<int>::AssignToAll(2 * dst.a());
case GE_SRCBLEND_DOUBLEINVDSTALPHA:
// TODO: Clamping?
return Vec3<int>::AssignToAll(255 - 2 * dst.a());
return Vec3<int>::AssignToAll(255 - std::min(2 * dst.a(), 255));
case GE_SRCBLEND_FIXA:
default:
@ -879,13 +878,13 @@ static inline Vec3<int> GetDestFactor(const Vec4<int>& source, const Vec4<int>&
return Vec3<int>::AssignToAll(2 * source.a());
case GE_DSTBLEND_DOUBLEINVSRCALPHA:
return Vec3<int>::AssignToAll(255 - 2 * source.a());
return Vec3<int>::AssignToAll(255 - std::min(2 * source.a(), 255));
case GE_DSTBLEND_DOUBLEDSTALPHA:
return Vec3<int>::AssignToAll(2 * dst.a());
case GE_DSTBLEND_DOUBLEINVDSTALPHA:
return Vec3<int>::AssignToAll(255 - 2 * dst.a());
return Vec3<int>::AssignToAll(255 - std::min(2 * dst.a(), 255));
case GE_DSTBLEND_FIXB:
default:
@ -896,6 +895,7 @@ static inline Vec3<int> GetDestFactor(const Vec4<int>& source, const Vec4<int>&
static inline Vec3<int> AlphaBlendingResult(const Vec4<int> &source, const Vec4<int> &dst)
{
// Note: These factors cannot go below 0, but they can go above 255 when doubling.
Vec3<int> srcfactor = GetSourceFactor(source, dst);
Vec3<int> dstfactor = GetDestFactor(source, dst);