i965: Fix copy'n'paste issue that made brw->urb.constrained useless.

Also, add a comment explaining what brw->urb.constrained tries to do.

diff --git a/src/mesa/drivers/dri/i965/brw_urb.c b/src/mesa/drivers/dri/i965/brw_urb.c
index 1116ade0a47074598f3608ee6e2b3b2b11a66e29..1a004176de1c1d623535ff4ed614463222d13bd5 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_urb.c
+++ b/src/mesa/drivers/dri/i965/brw_urb.c
@@ -92,9 +92,9 @@ static void recalculate_urb_fence( struct brw_context *brw )
    if (brw->urb.vsize < vsize ||
        brw->urb.sfsize < sfsize ||
        brw->urb.csize < csize ||
-       (brw->urb.constrained && (brw->urb.vsize > brw->urb.vsize ||
-                                brw->urb.sfsize > brw->urb.sfsize ||
-                                brw->urb.csize > brw->urb.csize))) {
+       (brw->urb.constrained && (brw->urb.vsize > vsize ||
+                                brw->urb.sfsize > sfsize ||
+                                brw->urb.csize > csize))) {
       
 
       brw->urb.csize = csize;
@@ -114,6 +114,10 @@ static void recalculate_urb_fence( struct brw_context *brw )
         brw->urb.nr_sf_entries = limits[SF].min_nr_entries;    
         brw->urb.nr_cs_entries = limits[CS].min_nr_entries;    
 
+        /* Mark us as operating with constrained nr_entries, so that next
+         * time we recalculate we'll resize the fences in the hope of
+         * escaping constrained mode and getting back to normal performance.
+         */
         brw->urb.constrained = 1;
         
         if (!check_urb_layout(brw)) {