Add option to Copy the active view layer, and add an empty view layer

Modify the view layer add operator (and underlying `BKE_view_layer_add`)
to allow for copying the current view layer, as well as adding a new one
but with all LayerCollections disabled by default (this is important for
heavy scenes where currently adding view layers can take a long time due
to enabling every collection by default).

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D6862

1 files changed, 10 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_layer.h b/source/blender/blenkernel/BKE_layer.h
index 19eb40debe6..7059675ec7d 100644
--- a/source/blender/blenkernel/BKE_layer.h
+++ b/source/blender/blenkernel/BKE_layer.h
@@ -44,10 +44,19 @@ struct Scene;
 struct View3D;
 struct ViewLayer;
 
+typedef enum eViewLayerCopyMethod {
+  VIEWLAYER_ADD_NEW = 0,
+  VIEWLAYER_ADD_EMPTY = 1,
+  VIEWLAYER_ADD_COPY = 2,
+} eViewLayerCopyMethod;
+
 struct ViewLayer *BKE_view_layer_default_view(const struct Scene *scene);
 struct ViewLayer *BKE_view_layer_default_render(const struct Scene *scene);
 struct ViewLayer *BKE_view_layer_find(const struct Scene *scene, const char *layer_name);
-struct ViewLayer *BKE_view_layer_add(struct Scene *scene, const char *name);
+struct ViewLayer *BKE_view_layer_add(Scene *scene,
+                                     const char *name,
+                                     ViewLayer *view_layer_source,
+                                     const int type);
 
 /* DEPRECATED */
 struct ViewLayer *BKE_view_layer_context_active_PLACEHOLDER(const struct Scene *scene);