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3D: fix culling. fixes #86. watch out for any missing polygons elsewhere.

This commit is contained in:
StapleButter 2017-07-24 01:06:08 +02:00
parent 51d29c8804
commit 4a899ebe3f
1 changed files with 6 additions and 3 deletions
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9
src/GPU3D.cpp
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@ -645,9 +645,12 @@ void SubmitPolygon()
v0 = &TempVertexBuffer[0];
v1 = &TempVertexBuffer[1];
v2 = &TempVertexBuffer[2];
normalX = ((s64)v0->Position[1] * v2->Position[3]) - ((s64)v0->Position[3] * v2->Position[1]);
normalY = ((s64)v0->Position[3] * v2->Position[0]) - ((s64)v0->Position[0] * v2->Position[3]);
normalZ = ((s64)v0->Position[0] * v2->Position[1]) - ((s64)v0->Position[1] * v2->Position[0]);
normalX = ((s64)(v0->Position[1]-v1->Position[1]) * (v2->Position[3]-v1->Position[3]))
- ((s64)(v0->Position[3]-v1->Position[3]) * (v2->Position[1]-v1->Position[1]));
normalY = ((s64)(v0->Position[3]-v1->Position[3]) * (v2->Position[0]-v1->Position[0]))
- ((s64)(v0->Position[0]-v1->Position[0]) * (v2->Position[3]-v1->Position[3]));
normalZ = ((s64)(v0->Position[0]-v1->Position[0]) * (v2->Position[1]-v1->Position[1]))
- ((s64)(v0->Position[1]-v1->Position[1]) * (v2->Position[0]-v1->Position[0]));
while ((((normalX>>31) ^ (normalX>>63)) != 0) ||
(((normalY>>31) ^ (normalY>>63)) != 0) ||