+ /* If we have enough clip URB entries to run two threads, do so.
+ */
+ if (key->nr_urb_entries >= 10) {
+ /* Half of the URB entries go to each thread, and it has to be an
+ * even number.
+ */
+ assert(key->nr_urb_entries % 2 == 0);
+
+ /* Although up to 16 concurrent Clip threads are allowed on IGDNG,
+ * only 2 threads can output VUEs at a time.
+ */
+ if (BRW_IS_IGDNG(brw))
+ clip.thread4.max_threads = 16 - 1;
+ else
+ clip.thread4.max_threads = 2 - 1;
+ } else {
+ assert(key->nr_urb_entries >= 5);
+ clip.thread4.max_threads = 1 - 1;
+ }
+
+ if (INTEL_DEBUG & DEBUG_SINGLE_THREAD)
+ clip.thread4.max_threads = 0;