freedreno/a3xx: add support for S8 and Z32F_S8

Enables ARB_depth_buffer_float. There is no sampling support for
interleaved Z32F_S8, so we store the two textures separately, one as
Z32F, the other as S8. As a result, we need a lot of additional logic
for restores and transfers.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
10 files changed