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softrend: Add support for culling

This commit is contained in:
Stefanos Kornilios Mitsis Poiitidis 2015-08-05 12:05:58 +02:00 committed by TwistedUmbrella
parent bedd2db7b6
commit fcf273dd11
1 changed files with 21 additions and 3 deletions
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24
core/rend/soft/softrend.cpp
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@ -331,7 +331,7 @@ struct softrend : Renderer
}
//u32 nok,fok;
template <bool alpha_blend>
void Rendtriangle(const Vertex &v1, const Vertex &v2, const Vertex &v3, u32* colorBuffer)
void Rendtriangle(PolyParam* pp, int vertex_offset, const Vertex &v1, const Vertex &v2, const Vertex &v3, u32* colorBuffer)
{
const int stride = 640 * 4;
//Plane equation
@ -351,9 +351,27 @@ struct softrend : Renderer
// Deltas
{
//area: (X1-X3)*(Y2-Y3)-(Y1-Y3)*(X2-X3)
float area = ((X1 - X3)*(Y2 - Y3) - (Y1 - Y3)*(X2 - X3));
if (((X1 - X3)*(Y2 - Y3) - (Y1 - Y3)*(X2 - X3))>0)
if (area>0)
sgn = -1;
if (pp->isp.CullMode != 0) {
float abs_area = fabsf(area);
if (abs_area < FPU_CULL_VAL)
return;
if (pp->isp.CullMode >= 2) {
u32 mode = vertex_offset ^ pp->isp.CullMode & 1;
if (
(mode == 0 && area < 0) ||
(mode == 1 && area > 0)) {
return;
}
}
}
}
const float DX12 = sgn*(X1 - X2);
@ -555,7 +573,7 @@ struct softrend : Renderer
for (int v = 0; v < vertex_count; v++) {
Rendtriangle<alpha_blend>(verts[poly_idx[v]], verts[poly_idx[v + 1]], verts[poly_idx[v + 2]], render_buffer);
Rendtriangle<alpha_blend>(&params[i], v, verts[poly_idx[v]], verts[poly_idx[v + 1]], verts[poly_idx[v + 2]], render_buffer);
}
}
}