The loader extension provides upcalls to get surface state (native
resource and size) into the driver. The driver extension is called by a
kopper-aware loader in preference to __DRI_SWRAST's createNewDrawable.
Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14541>
Adam Jackson