r300g: implement hyper-z support. (v4)

This implements fast Z clear, Z compression, and HiZ support for r300->r500
GPUs.

It also allows cbzb clears when fast Z clears are being used for the ZB.

It requires a kernel with hyper-z support.

Thanks to Marek Olšák <maraeo@gmail.com>, who started this off, and Alex Deucher at AMD for providing lots of hints.

v2:
squashed zmask ram size fix]
squashed r300g/blitter: fix Z readback when compressed]

v3:
rebase around texture changes in master - .1 fix more bits

v4:
migrated to using u_mm in r300_texture to manage hiz/zmask rams consistently
disabled HiZ when using OQ
flush z-cache before turning hyper-z off
update hyper-z state on dsa state change
store depthclearvalue across cbzb clears and replace it afterwards.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gallium/drivers/r300/r300_flush.c b/src/gallium/drivers/r300/r300_flush.c
index fe182b6615..7fed9b5d07 100644
--- a/src/gallium/drivers/r300/r300_flush.c
+++ b/src/gallium/drivers/r300/r300_flush.c
@@ -44,7 +44,8 @@ static void r300_flush(struct pipe_context* pipe,
     u_upload_flush(r300->upload_ib);
 
     if (r300->dirty_hw) {
-        r300_emit_hyperz_end(r300);
+        if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
+            r300_emit_hyperz_end(r300);
         r300_emit_query_end(r300);
 
         r300->flush_counter++;