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Fix long-standing bug in BC4S / BC5S compression

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This commit is contained in:
Chuck Walbourn 2020-01-13 19:14:01 -08:00
parent 6f53f79328
commit 31ae44771d
1 changed files with 9 additions and 3 deletions
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12
DirectXTex/BC.h
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@ -249,12 +249,18 @@ template <bool bRange> void OptimizeAlpha(float *pX, float *pY, const float *pPo
uint32_t iStep; uint32_t iStep;
if (fDot <= 0.0f) if (fDot <= 0.0f)
iStep = ((6 == cSteps) && (pPoints[iPoint] <= fX * 0.5f)) ? 6u : 0u; {
// D3DX10 / D3DX11 didn't take into account the proper minimum value for the bRange (BC4S/BC5S) case
iStep = ((6 == cSteps) && (pPoints[iPoint] <= (fX + MIN_VALUE) * 0.5f)) ? 6u : 0u;
}
else if (fDot >= fSteps) else if (fDot >= fSteps)
iStep = ((6 == cSteps) && (pPoints[iPoint] >= (fY + 1.0f) * 0.5f)) ? 7u : (cSteps - 1); {
iStep = ((6 == cSteps) && (pPoints[iPoint] >= (fY + MAX_VALUE) * 0.5f)) ? 7u : (cSteps - 1);
}
else else
{
iStep = uint32_t(fDot + 0.5f); iStep = uint32_t(fDot + 0.5f);
}
if (iStep < cSteps) if (iStep < cSteps)
{ {