Catch no-op vertex buffers consisting only of vertices which will

also appear in a future buffer.

diff --git a/src/mesa/tnl/t_vtx_exec.c b/src/mesa/tnl/t_vtx_exec.c
index e8700b9..690912d 100644 (file)
--- a/src/mesa/tnl/t_vtx_exec.c
+++ b/src/mesa/tnl/t_vtx_exec.c
@@ -259,28 +259,30 @@ static GLuint _tnl_copy_vertices( GLcontext *ctx )
 void _tnl_flush_vtx( GLcontext *ctx )
 {
    TNLcontext *tnl = TNL_CONTEXT(ctx);
+   GLuint vertex_count = tnl->vtx.initial_counter - tnl->vtx.counter;
 
    if (0)
       _tnl_print_vtx( ctx );
 
-   if (tnl->vtx.prim_count && 
-       tnl->vtx.counter != tnl->vtx.initial_counter) {
+   if (tnl->vtx.prim_count && vertex_count) {
 
       tnl->vtx.copied.nr = _tnl_copy_vertices( ctx ); 
 
-      if (ctx->NewState)
-        _mesa_update_state( ctx );
+      if (tnl->vtx.copied.nr != vertex_count) {
+        if (ctx->NewState)
+           _mesa_update_state( ctx );
       
-      if (tnl->pipeline.build_state_changes)
-        _tnl_validate_pipeline( ctx );
+        if (tnl->pipeline.build_state_changes)
+           _tnl_validate_pipeline( ctx );
 
-      _tnl_vb_bind_vtx( ctx );
+        _tnl_vb_bind_vtx( ctx );
 
-      /* Invalidate all stored data before and after run:
-       */
-      tnl->pipeline.run_input_changes |= tnl->pipeline.inputs;
-      tnl->Driver.RunPipeline( ctx );
-      tnl->pipeline.run_input_changes |= tnl->pipeline.inputs;
+        /* Invalidate all stored data before and after run:
+         */
+        tnl->pipeline.run_input_changes |= tnl->pipeline.inputs;
+        tnl->Driver.RunPipeline( ctx );
+        tnl->pipeline.run_input_changes |= tnl->pipeline.inputs;
+      }
    }
 
    tnl->vtx.prim_count = 0;