evergreen_surface_value_conv_check
r = evergreen_surface_value_conv_check(p, &surf, "cb");
r = evergreen_surface_value_conv_check(p, &surf, "stencil");
r = evergreen_surface_value_conv_check(p, &surf, "depth");
r = evergreen_surface_value_conv_check(p, &surf, "texture");