AnimSys Todo: Scene/CompoNode Driver Hacks

Drivers for Scene, World, and Compositing Nodes now "work" (well,
sort-of)! Previously they were strictly restricted to object-
accessible data only; now they can function across the board (give or
take some weak spots).

Although there is still no depsgraph support so that these properties
update properly when their source controls are changed (this will
probably require a lot more work), they can still update under other
circumstances (i.e. frame change and/or manual refresh flushing via
mouse movement, etc.)

As the depsgraph tagging support is lacking, these just get always
executed for now, which might potentially be quite sluggish, though it
is hoped that there are so few of these top-level datablocks with
drivers hooked up that this is barely an issue in practice. At least I
haven't noticed any substantial slowdowns for animation playback, so
it should probably be fine.

1 files changed, 51 insertions, 10 deletions

diff --git a/source/blender/blenkernel/intern/scene.c b/source/blender/blenkernel/intern/scene.c
index 853e9e108d6..95f39db9d6f 100644
--- a/source/blender/blenkernel/intern/scene.c
+++ b/source/blender/blenkernel/intern/scene.c
@@ -945,27 +945,68 @@ float BKE_curframe(Scene *scene)
 	return ctime;
 }
 
+/* drivers support/hacks 
+ * 	- this method is called from scene_update_tagged_recursive(), so gets included in viewport + render
+ *	- these are always run since the depsgraph can't handle non-object data
+ *	- these happen after objects are all done so that we can read in their final transform values,
+ *	  though this means that objects can't refer to scene info for guidance...
+ */
+static void scene_update_drivers(Main *UNUSED(bmain), Scene *scene)
+{
+	float ctime = BKE_curframe(scene);
+	
+	/* scene itself */
+	if (scene->adt && scene->adt->drivers.first) {
+		BKE_animsys_evaluate_animdata(&scene->id, scene->adt, ctime, ADT_RECALC_DRIVERS);
+	}
+	
+	/* world */
+	// TODO: what about world textures? but then those have nodes too...
+	if (scene->world) {
+		ID *wid = (ID *)scene->world;
+		AnimData *adt= BKE_animdata_from_id(wid);
+		
+		if (adt && adt->drivers.first)
+			BKE_animsys_evaluate_animdata(wid, adt, ctime, ADT_RECALC_DRIVERS);
+	}
+	
+	/* nodes */
+	if (scene->nodetree) {
+		ID *nid = (ID *)scene->nodetree;
+		AnimData *adt= BKE_animdata_from_id(nid);
+		
+		if (adt && adt->drivers.first)
+			BKE_animsys_evaluate_animdata(nid, adt, ctime, ADT_RECALC_DRIVERS);
+	}
+}
+
 static void scene_update_tagged_recursive(Main *bmain, Scene *scene, Scene *scene_parent)
 {
 	Base *base;
+	
+	
 	scene->customdata_mask= scene_parent->customdata_mask;
 
 	/* sets first, we allow per definition current scene to have
 	   dependencies on sets, but not the other way around. */
-	if(scene->set)
+	if (scene->set)
 		scene_update_tagged_recursive(bmain, scene->set, scene_parent);
-
-	for(base= scene->base.first; base; base= base->next) {
+	
+	/* scene objects */
+	for (base= scene->base.first; base; base= base->next) {
 		Object *ob= base->object;
-
+		
 		object_handle_update(scene_parent, ob);
-
+		
 		if(ob->dup_group && (ob->transflag & OB_DUPLIGROUP))
 			group_handle_recalc_and_update(scene_parent, ob, ob->dup_group);
 			
 		/* always update layer, so that animating layers works */
 		base->lay= ob->lay;
 	}
+	
+	/* scene drivers... */
+	scene_update_drivers(bmain, scene);
 }
 
 /* this is called in main loop, doing tagged updates before redraw */
@@ -982,14 +1023,14 @@ void scene_update_tagged(Main *bmain, Scene *scene)
 
 	/* recalc scene animation data here (for sequencer) */
 	{
-		float ctime = BKE_curframe(scene); 
 		AnimData *adt= BKE_animdata_from_id(&scene->id);
-
-		if(adt && (adt->recalc & ADT_RECALC_ANIM))
+		float ctime = BKE_curframe(scene);
+		
+		if (adt && (adt->recalc & ADT_RECALC_ANIM))
 			BKE_animsys_evaluate_animdata(&scene->id, adt, ctime, 0);
 	}
-
-	if(scene->physics_settings.quick_cache_step)
+	
+	if (scene->physics_settings.quick_cache_step)
 		BKE_ptcache_quick_cache_all(bmain, scene);
 
 	/* in the future this should handle updates for all datablocks, not