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Fix issues with software clipping:

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* fixed max screen Y calculation. It fixes bug in Top Gear Overdrive, #2450
* fixed typo in rasterise().
This commit is contained in:
Sergey Lipskiy 2021-03-02 21:44:07 +07:00
parent e07b09b4d0
commit 92c9bd8408
1 changed files with 13 additions and 7 deletions
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20
src/SoftwareRender.cpp
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@ -360,17 +360,21 @@ f32 renderAndDrawTriangles(const SPVertex *_pVertices,
int dzdx = calcDzDx(pVtxClip);
vertexi vdraw[3];
for (u32 k = 0; k < 3; ++k) {
for (u32 k = 0; k < 3; ++k) {
const u32 idx = clockwise ? k : 3 - k - 1;
maxY = std::max(maxY, pVtxClip[idx].y);
vdraw[k].x = floatToFixed16(pVtxClip[idx].x);
vdraw[k].y = floatToFixed16(pVtxClip[idx].y);
vdraw[k].z = floatToFixed16(pVtxClip[idx].z);
}
const u32 idx = clockwise ? k : 3 - k - 1;
maxY = std::max(maxY, pVtxClip[idx].y);
vdraw[k].x = floatToFixed16(pVtxClip[idx].x);
vdraw[k].y = floatToFixed16(pVtxClip[idx].y);
vdraw[k].z = floatToFixed16(pVtxClip[idx].z);
}
Rasterize(vdraw, 3, dzdx);
};
auto calcMaxY = [&maxY](const vertexclip* pVtxClip)
{
for (u32 k = 0; k < 3; ++k)
maxY = std::max(maxY, pVtxClip[k].y);
};
for (u32 i = 0; i < _numElements; i += 3) {
u32 orbits = 0;
u32 modify = 0;
@ -402,6 +406,8 @@ f32 renderAndDrawTriangles(const SPVertex *_pVertices,
if (needResterise)
rasterise(vclip, clockwise);
else
calcMaxY(vclip);
} else {
assert(modify == 0);
// No screen space coordinates, so use clipping in homogeneous space.