mesa: Enable true refcounting for NullBufferObj.
This object can be shared with another context, so we cannot just
delete it when the owning context is being destroyed.
Ensuring that buffer objects are properly refcounted guarantees
NullBufferObj is destroyed when all references to it are removed.
diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index fccce51..591aa11 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -955,6 +955,7 @@
_mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
_mesa_free_attrib_data(ctx);
+ _mesa_free_buffer_objects(ctx);
_mesa_free_lighting_data( ctx );
_mesa_free_eval_data( ctx );
_mesa_free_texture_data( ctx );
@@ -974,6 +975,7 @@
#if FEATURE_ARB_pixel_buffer_object
_mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj, NULL);
_mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj, NULL);
+ _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj, NULL);
#endif
#if FEATURE_ARB_vertex_buffer_object