public override void Render()
{
arg12CommonArea.Clear();
arg2Area.Clear();
for (int i = 0; i < 4; i++)
{
arg12CommonArea.Add(rect[i] * Arg1Transform);
arg2Area.Add(rect[i] * Arg2Transform);
}
arg1RemainedAreaCount = 0;
var clockwiseOrder = AreVectorsClockwiseOrdered(arg2Area[0], arg2Area[1], arg2Area[2]);
for (int i = 0; i < 4; i++)
{
int j = (i < 3) ? i + 1 : 0;
var v1 = clockwiseOrder ? arg2Area[j] : arg2Area[i];
var v2 = clockwiseOrder ? arg2Area[i] : arg2Area[j];
if (Operation == ImageCombinerOperation.Multiply)
{
SplitPolygon(arg12CommonArea, splitResult1, splitResult2, v1, v2);
Toolbox.Swap(ref arg12CommonArea, ref splitResult1);
}
else if (Operation == ImageCombinerOperation.CutOut)
{
SplitPolygon(arg12CommonArea, splitResult1, splitResult2, v1, v2);
Toolbox.Swap(ref arg12CommonArea, ref splitResult1);
if (splitResult2.Count > 0)
{
Toolbox.Swap(ref splitResult2, ref arg1RemainedAreas[arg1RemainedAreaCount++]);
if (splitResult2 == null)
{
splitResult2 = new Polygon();
}
}
}
else
{
throw new InvalidOperationException();
}
}
// Following matrices transform vertices into texture coordinates.
var uvTransform1 = Arg1Transform.CalcInversed() * Arg1UVTransform;
var uvTransform2 = Arg2Transform.CalcInversed() * Arg2UVTransform;
Renderer.Transform1 = LocalToWorldTransform;
if (Operation == ImageCombinerOperation.Multiply)
{
PrepareVertices(arg12CommonArea);
Renderer.DrawTriangleFan(Arg1Texture, Arg2Texture, Arg12CommonMaterial, vertices, arg12CommonArea.Count);
}
else
{
for (int i = 0; i < arg1RemainedAreaCount; i++)
{
PrepareVertices(arg1RemainedAreas[i]);
Renderer.DrawTriangleFan(Arg1Texture, null, Arg1Material, vertices, arg1RemainedAreas[i].Count);
}
PrepareVertices(arg12CommonArea);
Renderer.DrawTriangleFan(Arg1Texture, Arg2Texture, Arg12CommonMaterial, vertices, arg12CommonArea.Count);
}
void PrepareVertices(Polygon polygon)
{
for (int i = 0; i < polygon.Count; i++)
{
vertices[i].Pos = polygon[i];
vertices[i].Color = Color;
var uv1 = polygon[i] * uvTransform1;
var uv2 = polygon[i] * uvTransform2;
vertices[i].UV1 = uv1;
vertices[i].UV2 = uv2;
}
}
}