Mesa (master): softpipe: fix depth texture sampling regression

[Brian Paul]

Module: Mesa
Branch: master
Commit: 9d9f8aba0aa51f707ac1d451fb8a89bb95676ab1
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=9d9f8aba0aa51f707ac1d451fb8a89bb95676ab1

Author: Brian Paul <brianp at vmware.com>
Date:   Thu Dec 16 17:38:16 2010 -0700

softpipe: fix depth texture sampling regression

We need to keep using the pipe_get_tile_swizzle() even though there's
no swizzling because we need to explicitly pass in the surface format.

Fixes http://bugs.freedesktop.org/show_bug.cgi?id=32459

---

 src/gallium/drivers/softpipe/sp_tex_tile_cache.c |   26 ++++++++++++++-------
 1 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/src/gallium/drivers/softpipe/sp_tex_tile_cache.c b/src/gallium/drivers/softpipe/sp_tex_tile_cache.c
index e5708a1..6fd324f 100644
--- a/src/gallium/drivers/softpipe/sp_tex_tile_cache.c
+++ b/src/gallium/drivers/softpipe/sp_tex_tile_cache.c
@@ -278,15 +278,23 @@ sp_find_cached_tile_tex(struct softpipe_tex_tile_cache *tc,
          tc->tex_z = addr.bits.z;
       }
 
-      /* get tile from the transfer (view into texture) */
-      pipe_get_tile_rgba(tc->pipe,
-                         tc->tex_trans,
-                         addr.bits.x * TILE_SIZE, 
-                         addr.bits.y * TILE_SIZE,
-                         TILE_SIZE,
-                         TILE_SIZE,
-                         (float *) tile->data.color);
-                         
+      /* get tile from the transfer (view into texture)
+       * Note we're using the swizzle version of this fuction only because
+       * we need to pass the texture cache's format explicitly.
+       */
+      pipe_get_tile_swizzle(tc->pipe,
+			    tc->tex_trans,
+                            addr.bits.x * TILE_SIZE, 
+                            addr.bits.y * TILE_SIZE,
+                            TILE_SIZE,
+                            TILE_SIZE,
+                            PIPE_SWIZZLE_RED,
+                            PIPE_SWIZZLE_GREEN,
+                            PIPE_SWIZZLE_BLUE,
+                            PIPE_SWIZZLE_ALPHA,
+                            tc->format,
+                            (float *) tile->data.color);
+
       tile->addr = addr;
    }