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_render.c b/src/gallium/drivers/r300/r300_render.c
index 7c4294bc9f..910f5f7113 100644
--- a/src/gallium/drivers/r300/r300_render.c
+++ b/src/gallium/drivers/r300/r300_render.c
@@ -223,7 +223,8 @@ static void r300_prepare_for_rendering(struct r300_context *r300,
 
     /* Emitted in flush. */
     end_dwords += 26; /* emit_query_end */
-    end_dwords += r300->hyperz_state.size; /* emit_hyperz_end */
+    if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
+        end_dwords += r300->hyperz_state.size + 2; /* emit_hyperz_end + zcache flush */
 
     cs_dwords += end_dwords;