sksl/shared/SwizzleScalar.sksl

uniform half unknownInput; // 1

half4 main(float2 coords) {
    half4 h4 = unknownInput.xxxx;
    h4 = unknownInput.xx01;
    h4 = unknownInput.0x10;
    h4 = unknownInput.0x0x;

    return h4;
}