public unsafe void ProcessVertex(int index, ref RasterizerVertex o)
{
var v = Data[index];
var pos = Vector4.Transform(new Vector4(v.position, 1.0f), ModelViewProjectionMatrix);
o.x = pos.X;
o.y = pos.Y;
o.z = pos.Z;
o.w = pos.W;
o.pvar[0] = v.texcoord.X;
o.pvar[1] = v.texcoord.Y;
}
public unsafe void ProcessVertex(int index, ref RasterizerVertex output)
{
var data = VertexData[index];
output.x = data.x;
output.y = data.y;
output.z = data.z;
output.w = 1.0f;
output.avar[0] = data.r;
output.avar[1] = data.g;
output.avar[2] = data.b;
}
public static unsafe RasterizerVertex InterpolateVertex(RasterizerVertex v0, RasterizerVertex v1, float t, int avarCount, int pvarCount)
{
RasterizerVertex result = new RasterizerVertex();
result.x = v0.x * (1.0f - t) + v1.x * t;
result.y = v0.y * (1.0f - t) + v1.y * t;
result.z = v0.z * (1.0f - t) + v1.z * t;
result.w = v0.w * (1.0f - t) + v1.w * t;
for (int i = 0; i < avarCount; ++i)
{
result.avar[i] = v0.avar[i] * (1.0f - t) + v1.avar[i] * t;
}
for (int i = 0; i < pvarCount; ++i)
{
result.pvar[i] = v0.pvar[i] * (1.0f - t) + v1.pvar[i] * t;
}
return(result);
}
public TriangleEquations(ref RasterizerVertex v0, ref RasterizerVertex v1, ref RasterizerVertex v2, int aVarCount, int pVarCount)
{
e0 = new EdgeEquation();
e1 = new EdgeEquation();
e2 = new EdgeEquation();
z = new ParameterEquation();
invw = new ParameterEquation();
avar = new ParameterEquation[aVarCount];
pvar = new ParameterEquation[pVarCount];
e0.init(ref v1, ref v2);
e1.init(ref v2, ref v0);
e2.init(ref v0, ref v1);
area2 = e0.c + e1.c + e2.c;
// Cull backfacing triangles.
if (area2 <= 0)
{
return;
}
float factor = 1.0f / area2;
z.Init(v0.z, v1.z, v2.z, ref e0, ref e1, ref e2, factor);
float invw0 = 1.0f / v0.w;
float invw1 = 1.0f / v1.w;
float invw2 = 1.0f / v2.w;
invw.Init(invw0, invw1, invw2, ref e0, ref e1, ref e2, factor);
for (int i = 0; i < aVarCount; ++i)
{
avar[i].Init(v0.avar[i], v1.avar[i], v2.avar[i], ref e0, ref e1, ref e2, factor);
}
for (int i = 0; i < pVarCount; ++i)
{
pvar[i].Init(v0.pvar[i] * invw0, v1.pvar[i] * invw1, v2.pvar[i] * invw2, ref e0, ref e1, ref e2, factor);
}
}
