Nodes: add Collection socket type

The implementation is pretty much the same as for Object sockets.
The socket color is the one that is used for collections in the outliner.

Part of D9739.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/depsgraph/intern/builder/deg_builder_relations.cc b/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
index 11d34782569..04686823d62 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
+++ b/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
@@ -2316,6 +2316,12 @@ void DepsgraphRelationBuilder::build_nodetree_socket(bNodeSocket *socket)
       build_image(image);
     }
   }
+  else if (socket->type == SOCK_COLLECTION) {
+    Collection *collection = ((bNodeSocketValueCollection *)socket->default_value)->value;
+    if (collection != nullptr) {
+      build_collection(nullptr, nullptr, collection);
+    }
+  }
 }
 
 void DepsgraphRelationBuilder::build_nodetree(bNodeTree *ntree)