public void Draw(RenderComposer composer)
{
// The vertices were taken from a font, and the polygon is huge.
composer.PushModelMatrix(Matrix4x4.CreateScale(0.1f, 0.1f, 1f));
composer.SetStencilTest(true);
composer.StencilWindingStart();
composer.ToggleRenderColor(false);
// Draw all of them together. Winding will take care of the overlap.
var accum = Rectangle.Empty;
for (var i = 0; i < _testPolygon.Length; i++)
{
composer.RenderVertices(_testPolygon[i].Vertices, Color.White);
accum = accum.Union(_testPolygon[i].Bounds2D);
}
composer.StencilWindingEnd();
composer.ToggleRenderColor(true);
// You need one quad which covers the bounds of all the polygons.
// In this case I added the bounding boxes, but you could just draw a screen sized quad.
composer.RenderSprite(accum, Color.Red);
composer.SetStencilTest(false);
composer.PopModelMatrix();
}
protected override bool RenderInternal(RenderComposer c)
{
c.SetStencilTest(true);
c.ToggleRenderColor(false);
c.StencilStartDraw();
c.RenderSprite(this, Color.White);
c.ToggleRenderColor(true);
c.StencilFillIn();
return(base.RenderInternal(c));
}
