struct Color {
    half red;
    half green;
    half blue;
    half alpha;
};

half4 helper() {
    Color c;
    c.red   = 0.0;
    c.green = 1.0;
    c.blue  = 0.0;
    c.alpha = 1.0;
    return half4(c.red, c.green, c.blue, c.alpha);
}

half4 main(float2 coords) {
    return helper();
}