Mesa (master): i965: don't clear resolve map when doing fast depth clears.

[Paul Berry]

Module: Mesa
Branch: master
Commit: 5133bd6585552a5708b294180fa9a561bf7564a6
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=5133bd6585552a5708b294180fa9a561bf7564a6

Author: Paul Berry <stereotype441 at gmail.com>
Date:   Wed Aug 22 08:02:39 2012 -0700

i965: don't clear resolve map when doing fast depth clears.

Previously, when performing a fast depth clear, we would also clear
the miptree's resolve map.  This destroyed important information,
since the resolve map contains information about needed resolves for
all levels and layers of the miptree, whereas a depth clear only
applies to a single level/layer combination at a time.  As a result,
resolves would sometimes fail to occur, leading to incorrect
rendering.

Fixes rendering artifacts with shadow maps in Unigine Heaven and
Unigine Sanctuary.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50270

Reviewed-by: Eric Anholt <eric at anholt.net>
Reviewed-by: Chad Versace <chad.versace at linux.intel.com>

---

 src/mesa/drivers/dri/i965/brw_clear.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_clear.c b/src/mesa/drivers/dri/i965/brw_clear.c
index e56a26a..ce40e52 100644
--- a/src/mesa/drivers/dri/i965/brw_clear.c
+++ b/src/mesa/drivers/dri/i965/brw_clear.c
@@ -193,11 +193,9 @@ brw_fast_clear_depth(struct gl_context *ctx)
       intel_batchbuffer_emit_mi_flush(intel);
    }
 
-   /* Now, the entire HiZ buffer contains data that needs to be resolved to the
-    * entire depth buffer (so any previous resolve records should get tossed
-    * out).
+   /* Now, the HiZ buffer contains data that needs to be resolved to the depth
+    * buffer.
     */
-   intel_resolve_map_clear(&mt->hiz_map);
    intel_renderbuffer_set_needs_depth_resolve(depth_irb);
 
    return true;