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-rw-r--r--src/mesa/drivers/dri/i965/brw_vs_state.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vs_state.c b/src/mesa/drivers/dri/i965/brw_vs_state.c
index be92313861..c3a7cc247c 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_state.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_state.c
@@ -96,7 +96,14 @@ vs_unit_create_from_key(struct brw_context *brw, struct brw_vs_unit_key *key)
* and those dwords will be written to the second URB handle when we
* brw_urb_WRITE() results.
*/
- vs.thread1.single_program_flow = 0;
+ /* Disable single program flow on Ironlake. We cannot reliably get
+ * all applications working without it. See:
+ * https://bugs.freedesktop.org/show_bug.cgi?id=29172
+ *
+ * The most notable and reliably failing application is the Humus
+ * demo "CelShading"
+ */
+ vs.thread1.single_program_flow = (intel->gen == 5);
if (intel->gen == 5)
vs.thread1.binding_table_entry_count = 0; /* hardware requirement */