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softgpu: Allow almost flat rectangles to go fast.

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Improves transform rectangles used in Chains of Olympus, for example on
the title screen.
This commit is contained in:
Unknown W. Brackets 2022-09-10 13:29:40 -07:00
parent 6004d4a459
commit e7d49cd7d0
1 changed files with 12 additions and 4 deletions
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16
GPU/Software/RasterizerRectangle.cpp
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@ -333,10 +333,18 @@ static bool AreCoordsRectangleCompatible(const RasterizerState &state, const Ver
if (!state.throughMode && !(data1.color1 == data0.color1))
return false;
// Do we have to think about perspective correction or slope mip level?
if (state.enableTextures && data1.clippos.w != data0.clippos.w)
return false;
if (state.pixelID.applyFog && data1.fogdepth != data0.fogdepth)
return false;
if (state.enableTextures && data1.clippos.w != data0.clippos.w) {
// If the w is off by less than a factor of 1/512, it should be safe to treat as a rectangle.
static constexpr float halftexel = 0.5f / 512.0f;
if (data1.clippos.w - halftexel > data0.clippos.w || data1.clippos.w + halftexel < data0.clippos.w)
return false;
}
if (state.pixelID.applyFog && data1.fogdepth != data0.fogdepth) {
// Similar to w, this only matters if they're farther apart than 1/255.
static constexpr float foghalfstep = 0.5f / 255.0f;
if (data1.fogdepth - foghalfstep > data0.fogdepth || data1.fogdepth + foghalfstep < data0.fogdepth)
return false;
}
}
return true;
}