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, 10 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_ID.c b/source/blender/makesrna/intern/rna_ID.c
index 194c3e8d18e..e4692d32338 100644
--- a/source/blender/makesrna/intern/rna_ID.c
+++ b/source/blender/makesrna/intern/rna_ID.c
@@ -486,6 +486,16 @@ static void rna_def_ID(BlenderRNA *brna)
 	RNA_def_property_flag(prop, PROP_LIB_EXCEPTION);
 	RNA_def_property_ui_text(prop, "Tag", "Tools can use this to tag data (initial state is undefined)");
 
+	prop= RNA_def_property(srna, "is_updated", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flag", LIB_ID_RECALC);
+	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+	RNA_def_property_ui_text(prop, "Is Updated", "Datablock is tagged for recalculation");
+
+	prop= RNA_def_property(srna, "is_updated_data", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flag", LIB_ID_RECALC_DATA);
+	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+	RNA_def_property_ui_text(prop, "Is Updated Data", "Datablock data is tagged for recalculation");
+
 	prop= RNA_def_property(srna, "library", PROP_POINTER, PROP_NONE);
 	RNA_def_property_pointer_sdna(prop, NULL, "lib");
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);