Mesa (7.10): i965: Fix tex_swizzle when depth mode is GL_RED

[Kenneth Graunke]

Module: Mesa
Branch: 7.10
Commit: b8a077cee0f3856d5c3d4468918513515bbd0dcb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b8a077cee0f3856d5c3d4468918513515bbd0dcb

Author: Chad Versace <chad.versace at intel.com>
Date:   Sat Mar 12 17:49:41 2011 -0800

i965: Fix tex_swizzle when depth mode is GL_RED

Change swizzle from (x000) to (x001).

Signed-off-by: Chad Versace <chad.versace at intel.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_wm.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_wm.c b/src/mesa/drivers/dri/i965/brw_wm.c
index 656501b..4f4cd9d 100644
--- a/src/mesa/drivers/dri/i965/brw_wm.c
+++ b/src/mesa/drivers/dri/i965/brw_wm.c
@@ -379,9 +379,10 @@ static void brw_wm_populate_key( struct brw_context *brw,
 	    } else if (t->DepthMode == GL_LUMINANCE) {
 	       swizzles[3] = SWIZZLE_ONE;
 	    } else if (t->DepthMode == GL_RED) {
+	       /* See table 3.23 of the GL 3.0 spec. */
 	       swizzles[1] = SWIZZLE_ZERO;
 	       swizzles[2] = SWIZZLE_ZERO;
-	       swizzles[3] = SWIZZLE_ZERO;
+	       swizzles[3] = SWIZZLE_ONE;
 	    }
 	 }