[require]
GLSL >= 1.20

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

[fragment shader]
void main()
{
    const float zero = refract(0.0, 0.0, 2.0);
    const vec2 v1 = vec2(-1.0, 0.0);
    const vec2 v2 = vec2(0.70710678, 0.70710678);
    const vec2 r = refract(v1, v2, 0.5);
    gl_FragColor = vec4(r.x + 1.0, r.y + 1.0, zero, 1.0);
}

[test]
draw rect -1 -1 2 2
probe all rgb 0.0885621726633092 0.588562172663309 0