[require]
GLSL >= 1.30

[fragment shader]
uniform int n;
uniform vec4 val, val2;

void main()
{
    vec4 x = val;
    if (n != 1) {
      if (n == 2)
        x.xy = val2.xy;
    } else {
      x = val2;
    }
    gl_FragColor = x;
}

[test]
uniform int n 3
uniform vec4 val 0 1 0 1
uniform vec4 val2 1 0 0 1

draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 1.0