varying vec2 uv;

void main() {
	if(abs(uv.x - 0.5) > 0.25)
		if(abs(abs(uv.x - 0.5)-0.25) * 2.0 > 0.5 - abs(uv.y - 0.5))
			discard;
	gl_FragColor = gl_Color;
}