*/
const struct util_format_description *desc =
util_format_description(resource->data.image_format);
- unsigned i =
+ int i =
util_format_get_first_non_void_channel(resource->data.image_format);
+ assert(i >= 0);
if (desc->channel[i].pure_integer ||
desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT)