i965: Fix primitive restart on Haswell.

Haswell moved the "Cut Index Enable" bit from the INDEX_BUFFER packet to
a new 3DSTATE_VF packet, so we need to emit that.  Also, it requires us
to specify the cut index rather than assuming it's 0xffffffff.

This adds a new Haswell-specific tracked state atom to gen7_atoms.
Normally, we would create a new generation-specific atom list, but since
there's only one difference over Ivybridge so far, I chose to simply
make it return without doing any work on non-Haswell systems.

Fixes five piglit tests:
- general/primitive-restart-DISABLE_VBO
- general/primitive-restart-VBO_COMBINED_VERTEX_AND_INDEX
- general/primitive-restart-VBO_INDEX_ONLY
- general/primitive-restart-VBO_SEPARATE_VERTEX_AND_INDEX
- general/primitive-restart-VBO_VERTEX_ONLY

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_state.h b/src/mesa/drivers/dri/i965/brw_state.h
index a80ee865a9e..99fa088a90f 100644
--- a/src/mesa/drivers/dri/i965/brw_state.h
+++ b/src/mesa/drivers/dri/i965/brw_state.h
@@ -133,6 +133,7 @@ extern const struct brw_tracked_state gen7_wm_constants;
 extern const struct brw_tracked_state gen7_wm_constant_surface;
 extern const struct brw_tracked_state gen7_wm_state;
 extern const struct brw_tracked_state gen7_wm_surfaces;
+extern const struct brw_tracked_state haswell_cut_index;
 
 /* brw_misc_state.c */
 uint32_t