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TexCache: Round DXT5 alpha up.

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This isn't quite right, but it seems better than rounding down.
Experimented with a lower round up value, but none were right - the
weighting must be more complex.
This commit is contained in:
Unknown W. Brackets 2018-11-04 09:31:30 -08:00
parent df200fc3d2
commit bd294f658f
1 changed files with 2 additions and 2 deletions
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4
GPU/Common/TextureDecoder.cpp
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@ -385,13 +385,13 @@ static inline u8 lerp8(const DXT5Block *src, int n) {
// These weights translate alpha1/alpha2 to fixed 8.8 point, pre-divided by 7.
int weight1 = ((7 - n) << 8) / 7;
int weight2 = (n << 8) / 7;
return (u8)((src->alpha1 * weight1 + src->alpha2 * weight2) >> 8);
return (u8)((src->alpha1 * weight1 + src->alpha2 * weight2 + 255) >> 8);
}
static inline u8 lerp6(const DXT5Block *src, int n) {
int weight1 = ((5 - n) << 8) / 5;
int weight2 = (n << 8) / 5;
return (u8)((src->alpha1 * weight1 + src->alpha2 * weight2) >> 8);
return (u8)((src->alpha1 * weight1 + src->alpha2 * weight2 + 255) >> 8);
}
void DXTDecoder::DecodeAlphaDXT5(const DXT5Block *src) {