i965: Fix occlusion query on sandybridge

Clear target query buffer fixed occlusion query on sandybridge. https://bugs.freedesktop.org/show_bug.cgi?id=32167
2010-12-28 11:03:45 +08:00
parent 59fa8600d8
commit 689aca7822
1 changed files with 6 additions and 0 deletions
@@ -232,6 +232,12 @@ brw_prepare_query_begin(struct brw_context *brw)
      brw->query.bo = NULL;

      brw->query.bo = drm_intel_bo_alloc(intel->bufmgr, "query", 4096, 1);
+
+      /* clear target buffer */
+      drm_intel_bo_map(brw->query.bo, GL_TRUE);
+      memset((char *)brw->query.bo->virtual, 0, 4096);
+      drm_intel_bo_unmap(brw->query.bo);
+
      brw->query.index = 0;
   }