llvmpipe: Treat state changes systematically.

That is:
- check for no op
- update/flush draw module
- update bound state and mark it as dirty

In particular flushing the draw module is important since it may contain
unflushed primitives which would otherwise be draw with wrong state.

1 files changed, 8 insertions, 4 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_state_vs.c b/src/gallium/drivers/llvmpipe/lp_state_vs.c
index 8a761648e7..884e3878e6 100644
--- a/src/gallium/drivers/llvmpipe/lp_state_vs.c
+++ b/src/gallium/drivers/llvmpipe/lp_state_vs.c
@@ -70,14 +70,18 @@ fail:
 
 
 void
-llvmpipe_bind_vs_state(struct pipe_context *pipe, void *vs)
+llvmpipe_bind_vs_state(struct pipe_context *pipe, void *_vs)
 {
    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
+   const struct lp_vertex_shader *vs = (const struct lp_vertex_shader *)_vs;
 
-   llvmpipe->vs = (const struct lp_vertex_shader *)vs;
+   if (llvmpipe->vs == vs)
+      return;
 
-   draw_bind_vertex_shader(llvmpipe->draw,
-                           (llvmpipe->vs ? llvmpipe->vs->draw_data : NULL));
+   draw_bind_vertex_shader(llvmpipe->draw, 
+                           vs ? vs->draw_data : NULL);
+
+   llvmpipe->vs = vs;
 
    llvmpipe->dirty |= LP_NEW_VS;
 }