uniform half4 colorGreen, colorRed;

half4 main(float2 coords) {
    float f = colorGreen.g;
    int   i = int(colorGreen.g);
    bool  b = bool(colorGreen.g);

    float f1 = float(f);
    float f2 = float(i);
    float f3 = float(b);
    int   i1 = int(f);
    int   i2 = int(i);
    int   i3 = int(b);
    bool  b1 = bool(f);
    bool  b2 = bool(i);
    bool  b3 = bool(b);

    return  half(f1) + half(f2) + half(f3)  +
            half(i1) + half(i2) + half(i3)  +
            half(b1) + half(b2) + half(b3)  == 9 ? colorGreen : colorRed;
}