[Mesa-dev] [PATCH] i965: Don't flag BRW_NEW_SURFACES unless some push constants are dirty.

[Kenneth Graunke]

Due to a gaffe on my part, we were re-emitting all binding table entries
on every single draw call.  The push_constant_packets atom listens to
BRW_NEW_DRAW_CALL, but skips emitting 3DSTATE_CONSTANT_XS for each stage
unless stage_state->push_constants_dirty is true.  However, it flagged
BRW_NEW_SURFACES unconditionally at the end, by mistake.

Instead, it should only flag it if we actually emit 3DSTATE_CONSTANT_XS
for a stage.  We can move it a few lines up, inside the loop - the early
continues will skip over it if push constants aren't dirty for a stage.

With INTEL_NO_HW=1 set, improves performance of GFXBench5 gl_driver_2
on Apollolake at 1280x720 by 1.01122% +/- 0.470723% (n=35).
---
 src/mesa/drivers/dri/i965/genX_state_upload.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/genX_state_upload.c b/src/mesa/drivers/dri/i965/genX_state_upload.c
index 98f69522de5..b7a6cd73619 100644
--- a/src/mesa/drivers/dri/i965/genX_state_upload.c
+++ b/src/mesa/drivers/dri/i965/genX_state_upload.c
@@ -3117,9 +3117,8 @@ genX(upload_push_constant_packets)(struct brw_context *brw)
       }
 
       stage_state->push_constants_dirty = false;
+      brw->ctx.NewDriverState |= GEN_GEN >= 9 ? BRW_NEW_SURFACES : 0;
    }
-
-   brw->ctx.NewDriverState |= GEN_GEN >= 9 ? BRW_NEW_SURFACES : 0;
 }
 
 const struct brw_tracked_state genX(push_constant_packets) = {
-- 
2.14.3