uniform half4 colorRed, colorGreen;

half4 main(float2 coords) {
    half4 color = colorRed;

    const int three = 3;
    const int3 vecFour = int3(4);
    switch (int(colorGreen.g)) {
        case vecFour.000x.y:      break;                     // case 0
        case int4(1, 2, 3, 4).x:  color = colorGreen; break; // case 1
        case int(max(-5.5, 2.0)): break;                     // case 2
        case three:               break;                     // case 3
        case vecFour.yz01.x:      break;                     // case 4
        case 2 * 3 - 1:           break;                     // case 5
        default:                  break;
    }

    return color;
}