skia2/resources/sksl/shared/InoutParameters.sksl

uniform half4 colorGreen;

inline void outParameterWrite(out half4 x) {
    x = colorGreen;
}

inline void outParameterWriteIndirect(out half4 c) {
    outParameterWrite(c);
}

inline void inoutParameterWrite(inout half4 x) {
    x *= x;
}

inline void inoutParameterWriteIndirect(inout half4 x) {
    inoutParameterWrite(x);
}

inline void inoutParameterRead(inout half4 x) {
    half4 scratch = x * x;
}

inline void inoutParameterIgnore(inout half4 x) {
    half4 scratch = colorGreen * colorGreen;
}

half4 main(float2 coords) {
    half4 c;

    // These functions write to their `out` param.
    outParameterWrite(c);
    outParameterWriteIndirect(c);
    inoutParameterWrite(c);
    inoutParameterWriteIndirect(c);

    // These functions don't write to their `out` param.
    inoutParameterRead(c);
    inoutParameterIgnore(c);

    return c;
}