[require]
GLSL >= 1.10

[vertex shader]
void main()
{
	gl_Position = gl_Vertex;
}

[fragment shader]
uniform vec4 v;

void main()
{
	gl_FragColor = v;
	if (v.x < 1.0 || v.y > 0.0 || v.z < 1.0)
		return;  // should always return
	gl_FragColor = vec4(1.0) - v;
}

[test]
uniform vec4 v 0 1 0 1

draw rect -1 -1 2 2
probe all rgba 0 1 0 1