mx_mix_surfaceshader.osl

void mx_mix_surfaceshader(surfaceshader fg, surfaceshader bg, float w, output surfaceshader result)
{
    result.bsdf = mix(bg.bsdf, fg.bsdf, w);
    result.edf = mix(bg.edf, fg.edf, w);
    result.opacity = mix(bg.opacity, fg.opacity, w);
}