[require]
GLSL >= 1.10

[vertex shader]
// Pass loop info as uniforms to avoid unrolling
// We test 300 iterations because that's greater than PS3.0's 255 loop
// iteration limit.
uniform int iters;
uniform float step;
uniform float expected;
varying vec4 color;
void main()
{
	float sum = 0.0;
	int i;
	for (i = 0; i < iters; i++) {
		sum += step;
	}
	if (sum == expected) {
		color = vec4(0, 1, 0, 1); // green=good
	} else {
		color = vec4(1, 0, 0, 1); // red=bad
	}
	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}


[fragment shader]
varying vec4 color;
void main()
{
	gl_FragColor = color;
}

[test]
uniform int iters 300
uniform float step 1.0
uniform float expected 300.0
draw rect -1 -1 2 2
probe rgb 1 1  0 1 0