void SoftwareRasterizer::draw(const F32* verts, U vertCount, U stride, Bool backfaceCulling)
{
ANKI_ASSERT(verts && vertCount > 0 && (vertCount % 3) == 0);
ANKI_ASSERT(stride >= sizeof(F32) * 3 && (stride % sizeof(F32)) == 0);
U floatStride = stride / sizeof(F32);
const F32* vertsEnd = verts + vertCount * floatStride;
while(verts != vertsEnd)
{
// Convert triangle to view space
Array<Vec4, 3> triVspace;
for(U j = 0; j < 3; ++j)
{
triVspace[j] = m_mv * Vec4(verts[0], verts[1], verts[2], 1.0);
verts += floatStride;
}
// Cull if backfacing
if(backfaceCulling)
{
Vec4 norm = (triVspace[1] - triVspace[0]).cross(triVspace[2] - triVspace[1]);
ANKI_ASSERT(norm.w() == 0.0f);
Vec4 eye = triVspace[0].xyz0();
if(norm.dot(eye) >= 0.0f)
{
continue;
}
}
// Clip it
Array<Vec4, 6> clippedTrisVspace;
U clippedCount = 0;
clipTriangle(&triVspace[0], &clippedTrisVspace[0], clippedCount);
if(clippedCount == 0)
{
// Outside view
continue;
}
// Rasterize
Array<Vec4, 3> clip;
for(U j = 0; j < clippedCount; j += 3)
{
for(U k = 0; k < 3; k++)
{
clip[k] = m_p * clippedTrisVspace[j + k].xyz1();
ANKI_ASSERT(clip[k].w() > 0.0f);
}
rasterizeTriangle(&clip[0]);
}
}
}
static void clip(double x1,double y1,double z1,double u1,double v1,double w1, double x2,double y2,double z2,double u2,double v2,double w2, double x3,double y3,double z3,double u3,double v3,double w3) {
//TODO: FIX CLIPPING ERROR
int w1N = w1 < pseudoNear,
w2N = w2 < pseudoNear,
w3N = w3 < pseudoNear;
if(w1N && !w2N && !w3N) {
clipQuad(x1,y1,z1,u1,v1,w1,
x2,y2,z2,u2,v2,w2,
x3,y3,z3,u3,v3,w3);
}
else if(!w1N && w2N && !w3N) {
clipQuad(x2,y2,z2,u2,v2,w2,
x3,y3,z3,u3,v3,w3,
x1,y1,z1,u1,v1,w1);
}
else if(!w1N && !w2N && w3N) {
clipQuad(x3,y3,z3,u3,v3,w3,
x1,y1,z1,u1,v1,w1,
x2,y2,z2,u2,v2,w2);
}
else if(!w1N) {
clipTriangle(x1,y1,z1,u1,v1,w1,
x2,y2,z2,u2,v2,w2,
x3,y3,z3,u3,v3,w3);
}
else if(!w2N) {
clipTriangle(x2,y2,z2,u2,v2,w2,
x3,y3,z3,u3,v3,w3,
x1,y1,z1,u1,v1,w1);
}
else if(!w3N) {
clipTriangle(x3,y3,z3,u3,v3,w3,
x1,y1,z1,u1,v1,w1,
x2,y2,z2,u2,v2,w2);
}
}
