public void DrawBoundingBox(Sprite sprite) { RectangleF rect = sprite.GetBoundingBox(); Gl.glBegin(Gl.GL_LINE_LOOP); { Gl.glVertex2f(rect.Left, rect.Top); Gl.glVertex2f(rect.Right, rect.Top); Gl.glVertex2f(rect.Right, rect.Bottom); Gl.glVertex2f(rect.Left, rect.Bottom); } Gl.glEnd(); }