i965/cs: Setup surface binding for gl_NumWorkGroups

This will only be setup when the prog_data uses_num_work_groups
boolean is set.

At this point nothing will set uses_num_work_groups, but soon code
will set it when emitting code for the intrinsic that loads
gl_NumWorkGroups.

We can't emit this surface information earlier at the start of the
DispatchCompute* call because we may not have generated the program
yet. Until we generate the program, we don't know if the
gl_NumWorkGroups variable is accessed.

We also can't emit the surface as part of the brw_cs_state atom,
because we might not need the surface if gl_NumWorkGroups is not used
by the program.

Lastly, we cannot emit the surface later (after state upload) in the
DispatchCompute* call, because it needs to be run before the
brw_cs_state atom is emitted, since it changes the surface state.

Signed-off-by: Jordan Justen <[email protected]>
Reviewed-by: Kristian Høgsberg <[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 afce8ad3b27..3b7a4330c7a 100644
--- a/src/mesa/drivers/dri/i965/brw_state.h
+++ b/src/mesa/drivers/dri/i965/brw_state.h
@@ -158,6 +158,7 @@ extern const struct brw_tracked_state gen8_sf_clip_viewport;
 extern const struct brw_tracked_state gen8_vertices;
 extern const struct brw_tracked_state gen8_vf_topology;
 extern const struct brw_tracked_state gen8_vs_state;
+extern const struct brw_tracked_state brw_cs_work_groups_surface;
 
 static inline bool
 brw_state_dirty(struct brw_context *brw, GLuint mesa_flags, uint64_t brw_flags)