pan/bi: Handle nir_tex_src_lod

We need to emit some lowering code to convert it to the 8:8 format
expected by the hardware.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7081>
1 file changed