public override void BeginDraw(Renderer r)
{
_material = r.GetMaterial("circle");
GL.Enable(EnableCap.Blend);
GL.Disable(EnableCap.Texture2D);
GL.BindTexture(TextureTarget.Texture2D, 0);
_material.Bind();
float cx = X - r.Backgrounds[0].HScroll;
float cy = Y - r.Backgrounds[0].VScroll;
Vector3 p = new Vector3(cx,cy,Radius);
_material.Uniform3("circle", ref p);
Vector2 le = new Vector2(_thickness/2.0f,-_thickness/2.0f-_aawidth);
Vector2 he = new Vector2(_thickness/2.0f+_aawidth,-_thickness/2.0f);
_material.Uniform2("lowedge", ref le);
_material.Uniform2("highedge", ref he);
_material.Color4("color", ref Color);
}
