[PATCH 1/2] i965: Correct check for re-bound buffer in intel_update_image_buffer

[Keith Packard]

The buffer-object is the persistent thing passed through the loader, so when
updating an image buffer, check to see if it is already bound to the provided
bo. The region, on the other hand, is allocated separately for the miptree,
and so will never be the same as that passed back from the loader.

Signed-off-by: Keith Packard <keithp at keithp.com>
---
 src/mesa/drivers/dri/i965/brw_context.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index bee98e3..64ff855 100644
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -1339,10 +1339,21 @@ intel_update_image_buffer(struct brw_context *intel,
 
    unsigned num_samples = rb->Base.Base.NumSamples;
 
-   if (rb->mt &&
-       rb->mt->region &&
-       rb->mt->region == region)
-      return;
+   /* Check and see if we're already bound to the right
+    * buffer object
+    */
+   if (num_samples == 0) {
+       if (rb->mt &&
+           rb->mt->region &&
+           rb->mt->region->bo == region->bo)
+          return;
+   } else {
+       if (rb->mt &&
+           rb->mt->singlesample_mt &&
+           rb->mt->singlesample_mt->region &&
+           rb->mt->singlesample_mt->region->bo == region->bo)
+          return;
+   }
 
    intel_miptree_release(&rb->mt);
    rb->mt = intel_miptree_create_for_image_buffer(intel,
-- 
1.8.4.3