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GPU: Avoid a texture offset change in sw transform.

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If we do it this late, it changes the shader, but that is tricky to handle
for all the backends.
This commit is contained in:
Unknown W. Brackets 2020-05-07 23:13:18 -07:00
parent 48980d8786
commit 4d11256807
1 changed files with 11 additions and 3 deletions
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14
GPU/Common/SoftwareTransformCommon.cpp
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@ -501,6 +501,8 @@ void SoftwareTransform(
if (tlOutside || (brOutside && tlAlmostOutside)) {
// This is how far the nearest coord is, so that's where we'll look for the next framebuf.
const u32 prevXOffset = gstate_c.curTextureXOffset;
const u32 prevYOffset = gstate_c.curTextureYOffset;
const u32 yOffset = (int)(gstate_c.curTextureHeight * std::min(transformed[0].v, transformed[1].v));
if (texCache->SetOffsetTexture(yOffset)) {
const float oldWidthFactor = widthFactor;
@ -509,13 +511,19 @@ void SoftwareTransform(
heightFactor = (float)h / (float)gstate_c.curTextureHeight;
// We need to subtract this offset from the Vs to address the new framebuf.
// Note: SetOffsetTexture() will account for any overshoot in yOffset.
const float yDiff = (float)yOffset / (float)h;
const float adjustedYOffset = yOffset + prevYOffset - gstate_c.curTextureYOffset;
const float yDiff = (float)adjustedYOffset / (float)h;
const float adjustedXOffset = prevXOffset - gstate_c.curTextureXOffset;
const float xDiff = (float)adjustedXOffset / (float)w;
for (int index = 0; index < maxIndex; ++index) {
transformed[index].u *= widthFactor / oldWidthFactor;
transformed[index].u = (transformed[index].u / oldWidthFactor - xDiff) * widthFactor;
transformed[index].v = (transformed[index].v / oldHeightFactor - yDiff) * heightFactor;
}
// We undid the offset, so reset. This avoids a different shader.
gstate_c.curTextureXOffset = prevXOffset;
gstate_c.curTextureYOffset = prevYOffset;
result->textureChanged = true;
}
}