i965/blorp: Add fields brw_blorp_mip_info::level,layer

The new fields define the 2D miptree slice to be used. A following patch
will pass the new fields through to intel_miptree_slice_has_hiz().

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>
2 files changed