[Bf-blender-cvs] [c0ddbf39c4e] blender2.8: Fix T53646: Blender 2.8 multiple crashes in auto UVs generation

[Sergey Sharybin]

Commit: c0ddbf39c4e175537de89d63be60bd3bc20fbace
Author: Sergey Sharybin
Date:   Wed Jan 24 14:00:49 2018 +0100
Branches: blender2.8
https://developer.blender.org/rBc0ddbf39c4e175537de89d63be60bd3bc20fbace

Fix T53646: Blender 2.8 multiple crashes in auto UVs generation

Make sure scene and view_layer set for depsgraph before running editors
update. This is required since tagging might happen before we created depsgraph.

===================================================================

M	source/blender/depsgraph/intern/depsgraph_tag.cc

===================================================================

diff --git a/source/blender/depsgraph/intern/depsgraph_tag.cc b/source/blender/depsgraph/intern/depsgraph_tag.cc
index f63a4c90427..38f43f5720b 100644
--- a/source/blender/depsgraph/intern/depsgraph_tag.cc
+++ b/source/blender/depsgraph/intern/depsgraph_tag.cc
@@ -379,6 +379,20 @@ void deg_graph_id_tag_update(Main *bmain, Depsgraph *graph, ID *id, int flag)
 	id_tag_update_ntree_special(bmain, graph, id, flag);
 }
 
+/* TODO(sergey): Consider storing scene and view layer at depsgraph allocation
+ * time.
+ */
+void deg_ensure_scene_view_layer(Depsgraph *graph,
+                                 Scene *scene,
+                                 ViewLayer *view_layer)
+{
+	if (!graph->need_update) {
+		return;
+	}
+	graph->scene = scene;
+	graph->view_layer = view_layer;
+}
+
 void deg_id_tag_update(Main *bmain, ID *id, int flag)
 {
 	deg_graph_id_tag_update(bmain, NULL, id, flag);
@@ -389,6 +403,11 @@ void deg_id_tag_update(Main *bmain, ID *id, int flag)
 			                                             view_layer,
 			                                             false);
 			if (depsgraph != NULL) {
+				/* Make sure depsgraph is pointing to a correct scene and
+				 * view layer. This is mainly required in cases when depsgraph
+				 * was not built yet.
+				 */
+				deg_ensure_scene_view_layer(depsgraph, scene, view_layer);
 				deg_graph_id_tag_update(bmain, depsgraph, id, flag);
 			}
 		}