uniform half4 colorGreen, colorRed;

half4 main(float2 coords) {
    // Basic switch test.
    half4 color;
    switch (int(colorGreen.g)) {
        case 0:
            color = colorRed;
            break;
        case 1:
            color = colorGreen;
            break;
        default:
            color = colorRed;
            break;
    }
    return color;
}