[Mesa-dev] [PATCH] st/mesa: avoid vertex texture update for 0 case

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

If we had no vertex textures previously and we have none now,
don't bother doing the enables dance.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 src/mesa/state_tracker/st_atom_texture.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/src/mesa/state_tracker/st_atom_texture.c b/src/mesa/state_tracker/st_atom_texture.c
index 88e6128..1b82283 100644
--- a/src/mesa/state_tracker/st_atom_texture.c
+++ b/src/mesa/state_tracker/st_atom_texture.c
@@ -260,6 +260,9 @@ update_vertex_textures(struct st_context *st)
    struct gl_vertex_program *vprog = ctx->VertexProgram._Current;
    GLuint su;
 
+   if (!vprog->Base.SamplersUsed && st->state.num_vertex_textures == 0)
+	return;
+
    st->state.num_vertex_textures = 0;
 
    /* loop over sampler units (aka tex image units) */
-- 
1.7.6.5