Depsgraph/Python: callbacks and properties to detect datablock changes

* Adds two new python handlers: scene_update_pre() and scene_update_post()
  These run before and after Blender does a scene update on making modifications
  to the scene.
* Datablocks now have an is_updated property. This will be set to true in the
  above callbacks if the datablock was tagged to be updated. This works for the
  most common datablocks used for rendering: object, material, world, lamsp,
  texture, mesh, curve.
* Datablock collections also have an is_updated property. If this is set, it
  means one datablock of this type was added, removed or modified. It's also
  useful as a quick check to avoid looping over all datablocks.
* RenderEngine.view_update() can also check these properties, for interactive
  viewport rendering.

http://wiki.blender.org/index.php/Dev:2.6/Source/Render/UpdateAPI

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_depsgraph.h b/source/blender/blenkernel/BKE_depsgraph.h
index 59b7712a5a4..0b0637fb42a 100644
--- a/source/blender/blenkernel/BKE_depsgraph.h
+++ b/source/blender/blenkernel/BKE_depsgraph.h
@@ -120,6 +120,12 @@ void	DAG_ids_flush_update(struct Main *bmain, int time);
 void	DAG_id_tag_update(struct ID *id, short flag);
 		/* flush all tagged updates */
 void	DAG_ids_flush_tagged(struct Main *bmain);
+		/* check and clear ID recalc flags */
+void	DAG_ids_check_recalc(struct Main *bmain);
+void	DAG_ids_clear_recalc(struct Main *bmain);
+		/* test if any of this id type is tagged for update */
+void	DAG_id_type_tag(struct Main *bmain, short idtype);
+int		DAG_id_type_tagged(struct Main *bmain, short idtype);
 
 		/* (re)-create dependency graph for armature pose */
 void	DAG_pose_sort(struct Object *ob);