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softgpu: Fix a bug in the clipspace->screenspace transformation. Makes polygon clipping work perfectly :)

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Tony Wasserka 2013-06-26 09:34:28 +02:00 committed by neobrain
parent 608fd34b4d
commit f26d66e972
1 changed files with 3 additions and 31 deletions
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34
GPU/Software/TransformUnit.cpp
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@ -50,9 +50,9 @@ ScreenCoords TransformUnit::ClipToScreen(const ClipCoords& coords)
float vpz1 = getFloat24(gstate.viewportz1);
float vpz2 = getFloat24(gstate.viewportz2);
// TODO: Check for invalid parameters (x2 < x1, etc)
ret.x = (coords.x * vpx1 / coords.w + vpx2) / 4095.9375 * 0xFFFF;
ret.y = (coords.y * vpy1 / coords.w + vpy2) / 4096.9375 * 0xFFFF;
ret.z = (coords.z * vpz1 / coords.w + vpz2) / 4096.9375 * 0xFFFF;
ret.x = (coords.x * vpx1 / coords.w + vpx2) * 16; // 16 = 0xFFFF / 4095.9375;
ret.y = (coords.y * vpy1 / coords.w + vpy2) * 16; // 16 = 0xFFFF / 4095.9375;
ret.z = (coords.z * vpz1 / coords.w + vpz2) * 16; // 16 = 0xFFFF / 4095.9375;
return ret;
}
@ -240,37 +240,9 @@ void TransformUnit::SubmitPrimitive(void* vertices, u32 prim_type, int vertex_co
if(indices[i] != SKIP_FLAG)
{
VertexData data[3] = { *Vertices[indices[i]], *Vertices[indices[i+1]], *Vertices[indices[i+2]] };
for (int k = 0; k < 3; ++k)
{
if (data[k].clippos.x == data[k].clippos.w)
{
data[k].clippos.x -= data[k].clippos.w / 50.f;
}
if (data[k].clippos.x == -data[k].clippos.w)
{
data[k].clippos.x += data[k].clippos.w / 50.f;
}
if (data[k].clippos.y == data[k].clippos.w)
{
data[k].clippos.y -= data[k].clippos.w / 50.f;
}
if (data[k].clippos.y == -data[k].clippos.w)
{
data[k].clippos.y += data[k].clippos.w / 50.f;
}
if (data[k].clippos.z == data[k].clippos.w)
{
data[k].clippos.z -= data[k].clippos.w / 50.f;
}
if (data[k].clippos.z == -data[k].clippos.w)
{
data[k].clippos.z += data[k].clippos.w / 50.f;
}
}
data[0].drawpos = DrawingCoords(TransformUnit::ScreenToDrawing(TransformUnit::ClipToScreen(data[0].clippos)));
data[1].drawpos = DrawingCoords(TransformUnit::ScreenToDrawing(TransformUnit::ClipToScreen(data[1].clippos)));
data[2].drawpos = DrawingCoords(TransformUnit::ScreenToDrawing(TransformUnit::ClipToScreen(data[2].clippos)));
Rasterizer::DrawTriangle(data);
}
}