[Mesa-dev] [PATCH] st/mesa: don't load state parameters if there are none

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

Out of 7063 shaders from my shader-db:
- 6564 (93%) shaders don't have any state parameters.
- 347 (5%) shaders have 1 state parameter for WPOS lowering.
- The remaining 2% have more state parameters, usually matrices.
---
 src/mesa/state_tracker/st_atom_constbuf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/mesa/state_tracker/st_atom_constbuf.c b/src/mesa/state_tracker/st_atom_constbuf.c
index acaa85d..20f8b3d 100644
--- a/src/mesa/state_tracker/st_atom_constbuf.c
+++ b/src/mesa/state_tracker/st_atom_constbuf.c
@@ -73,7 +73,8 @@ void st_upload_constants( struct st_context *st,
        * the parameters list are explicitly set by the user with glUniform,
        * glProgramParameter(), etc.
        */
-      _mesa_load_state_parameters(st->ctx, params);
+      if (params->StateFlags)
+         _mesa_load_state_parameters(st->ctx, params);
 
       /* We always need to get a new buffer, to keep the drivers simple and
        * avoid gratuitous rendering synchronization.
-- 
2.1.4