[require]
GLSL >= 1.10

[vertex shader]
varying vec4 color;

void main()
{
	if (gl_Vertex.x < 0.0) {
		color = vec4(0.0, 1.0, 0.0, 0.0);
		/* left */
		for (float f = -2.0; f < gl_Vertex.x; f++) {
			if (gl_Vertex.z != f) /* always */
				break;
			color += vec4(1.0, 0.0, 0.0, 0.0);
		}
	} else {
		/* right */
		color = vec4(0.0, 1.0, 0.0, 0.0);
	}

	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}

[fragment shader]
varying vec4 color;

void main()
{
	gl_FragColor = color;
}

[test]
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 0.0