Method get_userdata

src/testrender/simplerend.cpp:253–280

bool
SimpleRenderer::get_userdata (bool derivatives, ustring name, TypeDesc type,
                              ShaderGlobals *sg, void *val)
{
    // Just to illustrate how this works, respect s and t userdata, filled
    // in with the uv coordinates.  In a real renderer, it would probably
    // look up something specific to the primitive, rather than have hard-
    // coded names.

    if (name == u_s && type == TypeDesc::TypeFloat) {
        ((float *)val)[0] = sg->u;
        if (derivatives) {
            ((float *)val)[1] = sg->dudx;
            ((float *)val)[2] = sg->dudy;
        }
        return true;
    }
    if (name == u_t && type == TypeDesc::TypeFloat) {
        ((float *)val)[0] = sg->v;
        if (derivatives) {
            ((float *)val)[1] = sg->dvdx;
            ((float *)val)[2] = sg->dvdy;
        }
        return true;
    }

    return false;
}


bool