Mesa (master): i965: Accelerate depth textures with border color.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 7216679c1998b49ff5b08e6b43f8d5779415bf54
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7216679c1998b49ff5b08e6b43f8d5779415bf54

Author: Eric Anholt <eric at anholt.net>
Date:   Thu Oct  9 11:45:58 2008 -0700

i965: Accelerate depth textures with border color.

The fallback was introduced to fix bug #16697, but made the test it was
fixing run excessively long.

---

 src/mesa/drivers/dri/i965/brw_fallback.c         |    5 +----
 src/mesa/drivers/dri/i965/brw_wm_sampler_state.c |   21 +++++++++++++++++++--
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fallback.c b/src/mesa/drivers/dri/i965/brw_fallback.c
index 2f6b7fe..4ea660a 100644
--- a/src/mesa/drivers/dri/i965/brw_fallback.c
+++ b/src/mesa/drivers/dri/i965/brw_fallback.c
@@ -74,10 +74,7 @@ static GLboolean do_check_fallback(struct brw_context *brw)
       if (texUnit->_ReallyEnabled) {
 	 struct intel_texture_object *intelObj = intel_texture_object(texUnit->_Current);
 	 struct gl_texture_image *texImage = intelObj->base.Image[0][intelObj->firstLevel];
-	 if (texImage->Border ||
-         ((texImage->_BaseFormat == GL_DEPTH_COMPONENT) &&
-          ((texImage->TexObject->WrapS == GL_CLAMP_TO_BORDER) || 
-           (texImage->TexObject->WrapT == GL_CLAMP_TO_BORDER)))) {
+	 if (texImage->Border) {
 	    DBG("FALLBACK: texture border\n");
 	    return GL_TRUE;
 	 }
diff --git a/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c b/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c
index 977b90a..f12ef47 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c
@@ -229,6 +229,9 @@ brw_wm_sampler_populate_key(struct brw_context *brw,
 	 struct wm_sampler_entry *entry = &key->sampler[unit];
 	 struct gl_texture_unit *texUnit = &brw->attribs.Texture->Unit[unit];
 	 struct gl_texture_object *texObj = texUnit->_Current;
+	 struct intel_texture_object *intelObj = intel_texture_object(texObj);
+	 struct gl_texture_image *firstImage =
+	    texObj->Image[0][intelObj->firstLevel];
 
 	 entry->wrap_r = texObj->WrapR;
 	 entry->wrap_s = texObj->WrapS;
@@ -244,8 +247,22 @@ brw_wm_sampler_populate_key(struct brw_context *brw,
     entry->comparefunc = texObj->CompareFunc;
 
 	 dri_bo_unreference(brw->wm.sdc_bo[unit]);
-	 brw->wm.sdc_bo[unit] = upload_default_color(brw, texObj->BorderColor);
-
+	 if (firstImage->_BaseFormat == GL_DEPTH_COMPONENT) {
+	    float bordercolor[4] = {
+	       texObj->BorderColor[0],
+	       texObj->BorderColor[0],
+	       texObj->BorderColor[0],
+	       texObj->BorderColor[0]
+	    };
+	    /* GL specs that border color for depth textures is taken from the
+	     * R channel, while the hardware uses A.  Spam R into all the
+	     * channels for safety.
+	     */
+	    brw->wm.sdc_bo[unit] = upload_default_color(brw, bordercolor);
+	 } else {
+	    brw->wm.sdc_bo[unit] = upload_default_color(brw,
+							texObj->BorderColor);
+	 }
 	 key->sampler_count = unit + 1;
       }
    }