private static Vector2[] clip(SimpleConvexPolygon poly1, SimpleConvexPolygon poly2)
{
var clipper = new ConvexPolygonClipper <SimpleConvexPolygon, SimpleConvexPolygon>(ref poly1, ref poly2);
Span <Vector2> buffer = stackalloc Vector2[clipper.GetClipBufferSize()];
return(clipper.Clip(buffer).ToArray());
}
protected void DrawClipped <T>(ref T polygon, TextureGL texture, ColourInfo drawColour, RectangleF?textureRect = null, Action <TexturedVertex2D> vertexAction = null,
Vector2?inflationPercentage = null)
where T : IConvexPolygon
{
var maskingQuad = GLWrapper.CurrentMaskingInfo.ConservativeScreenSpaceQuad;
var clipper = new ConvexPolygonClipper <Quad, T>(ref maskingQuad, ref polygon);
Span <Vector2> buffer = stackalloc Vector2[clipper.GetClipBufferSize()];
Span <Vector2> clippedRegion = clipper.Clip(buffer);
for (int i = 2; i < clippedRegion.Length; i++)
{
DrawTriangle(texture, new Triangle(clippedRegion[0], clippedRegion[i - 1], clippedRegion[i]), drawColour, textureRect, vertexAction, inflationPercentage);
}
}