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3D: attempt at fixing culling. players in Madden are no longer full of holes, and that also fixes occasional missing polygons in RaymanDS, and probably others.

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This commit is contained in:
StapleButter
2017-05-03 01:21:39 +02:00
parent ce240f4216
commit 9e622dcc66
2 changed files with 18 additions and 3 deletions
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19
src/GPU3D.cpp
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@ -610,6 +610,8 @@ void SubmitPolygon()
int prev, next;
// culling
// TODO: work out how it works on the real thing
// the normalization part is a wild guess
Vertex *v0, *v1, *v2;
s64 normalX, normalY, normalZ;
@ -618,9 +620,19 @@ 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])) >> 12;
normalY = (((s64)v0->Position[3] * v2->Position[0]) - ((s64)v0->Position[0] * v2->Position[3])) >> 12;
normalZ = (((s64)v0->Position[0] * v2->Position[1]) - ((s64)v0->Position[1] * v2->Position[0])) >> 12;
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]);
while ((((normalX>>31) ^ (normalX>>63)) != 0) ||
(((normalY>>31) ^ (normalY>>63)) != 0) ||
(((normalZ>>31) ^ (normalZ>>63)) != 0))
{
normalX >>= 4;
normalY >>= 4;
normalZ >>= 4;
}
dot = ((s64)v1->Position[0] * normalX) + ((s64)v1->Position[1] * normalY) + ((s64)v1->Position[3] * normalZ);
bool facingview = (dot < 0);
@ -807,6 +819,7 @@ void SubmitPolygon()
// determine bounds of the polygon
// also determine the W shift and normalize W
// TODO: normalization works both ways
// (ie two W's that span 12 bits or less will be brought to 16 bits)
u32 vtop = 0, vbot = 0;
s32 ytop = 192, ybot = 0;