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VideoCommon: Use avg(color1, color2) for color3 in CMPR textures

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This commit is contained in:
Stenzek
2016-12-11 21:54:21 +10:00
parent 989cdc0929
commit 344f2e57f6
3 changed files with 36 additions and 20 deletions
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10
Source/Core/VideoCommon/TextureDecoder_Generic.cpp
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@ -169,6 +169,7 @@ static void DecodeDXTBlock(u32* dst, const DXTBlock* src, int pitch)
colors[1] = MakeRGBA(red2, green2, blue2, 255);
if (c1 > c2)
{
// Approximation of x/3: 3/8 (1/2 - 1/8)
int blue3 = ((blue2 - blue1) >> 1) - ((blue2 - blue1) >> 3);
int green3 = ((green2 - green1) >> 1) - ((green2 - green1) >> 3);
int red3 = ((red2 - red1) >> 1) - ((red2 - red1) >> 3);
@ -177,9 +178,12 @@ static void DecodeDXTBlock(u32* dst, const DXTBlock* src, int pitch)
}
else
{
colors[2] = MakeRGBA((red1 + red2 + 1) / 2, // Average
(green1 + green2 + 1) / 2, (blue1 + blue2 + 1) / 2, 255);
colors[3] = MakeRGBA(red2, green2, blue2, 0); // Color2 but transparent
// color[3] is the same as color[2] (average of both colors), but transparent.
// This differs from DXT1 where color[3] is transparent black.
colors[2] =
MakeRGBA((red1 + red2 + 1) / 2, (green1 + green2 + 1) / 2, (blue1 + blue2 + 1) / 2, 255);
colors[3] =
MakeRGBA((red1 + red2 + 1) / 2, (green1 + green2 + 1) / 2, (blue1 + blue2 + 1) / 2, 0);
}
for (int y = 0; y < 4; y++)