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w is used on hw

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Jaklyy 2024-08-16 15:17:13 -04:00
parent 57d1043699
commit f8589d5566
1 changed files with 18 additions and 8 deletions
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26
src/GPU3D.cpp
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@ -974,31 +974,41 @@ void GPU3D::SubmitPolygon() noexcept
v2 = &TempVertexBuffer[2];
v3 = &TempVertexBuffer[3];
s32 vector[4];
s32 vector[6];
vector[0] = v0->Position[0] - v2->Position[0];
vector[1] = v0->Position[1] - v2->Position[1];
vector[2] = v1->Position[0] - v2->Position[0];
vector[3] = v1->Position[1] - v2->Position[1];
vector[2] = v0->Position[3] - v2->Position[3];
vector[3] = v1->Position[0] - v2->Position[0];
vector[4] = v1->Position[1] - v2->Position[1];
vector[5] = v1->Position[3] - v2->Position[3];
bool facingview;
if ((vector[0] | vector[1]) == 0 || (vector[2] | vector[3]) == 0) [[unlikely]] // if either vector is 0 the polygon is accepted and treated as front facing.
if ((vector[0] | vector[1] | vector[2]) == 0 || (vector[3] | vector[4] | vector[5]) == 0) [[unlikely]] // if either vector is 0 the polygon is accepted and treated as front facing.
{
facingview = true;
}
else
{
// calculate z component of cross product
s64 cross = ((s64)vector[0] * vector[3]) - ((s64)vector[1] * vector[2]);
s64 crossx = ((s64)vector[1] * vector[5]) - ((s64)vector[2] * vector[4]);
s64 crossy = ((s64)vector[2] * vector[3]) - ((s64)vector[0] * vector[5]);
s64 crossz = ((s64)vector[0] * vector[4]) - ((s64)vector[1] * vector[3]);
crossx *= v2->Position[0];
crossy *= v2->Position[1];
crossz *= v2->Position[3];
s64 dot = crossx + crossy + crossz;
// set a flag for the rasterizer used for:
// unwinding vertices
// determining whether slopes are swapped
// the less than depth test's == special case
facingview = (cross >= 0);
facingview = (dot >= 0);
// cull polygon if corresponding render flag isn't set
if (((cross >= 0) && (CurPolygonAttr & (1<<7))) || // front facing
((cross <= 0) && (CurPolygonAttr & (1<<6)))); // back facing
if (((dot >= 0) && (CurPolygonAttr & (1<<7))) || // front facing
((dot <= 0) && (CurPolygonAttr & (1<<6)))); // back facing
else
{
LastStripPolygon = NULL;