Refactor CDData masks, to have one mask per mesh elem type.

We already have different storages for cddata of verts, edges etc.,
'simply' do the same for the mask flags we use all around Blender code
to request some data, or limit some operation to some layers, etc.

Reason we need this is that some cddata types (like Normals) are
actually shared between verts/polys/loops, and we don’t want to generate
clnors everytime we request vnors!

As a side note, this also does final fix to T59338, which was the
trigger for this patch (need to request computed loop normals for
another mesh than evaluated one).

Reviewers: brecht, campbellbarton, sergey

Differential Revision: https://developer.blender.org/D4407

1 files changed, 5 insertions, 3 deletions

diff --git a/source/blender/depsgraph/DEG_depsgraph_query.h b/source/blender/depsgraph/DEG_depsgraph_query.h
index 1e544941e64..11732c55a99 100644
--- a/source/blender/depsgraph/DEG_depsgraph_query.h
+++ b/source/blender/depsgraph/DEG_depsgraph_query.h
@@ -33,6 +33,7 @@ struct ID;
 
 struct BLI_Iterator;
 struct Base;
+struct CustomData_MeshMasks;
 struct Depsgraph;
 struct DupliObject;
 struct ListBase;
@@ -66,9 +67,10 @@ bool DEG_id_type_any_updated(const struct Depsgraph *depsgraph);
 /* Get additional evaluation flags for the given ID. */
 uint32_t DEG_get_eval_flags_for_id(const struct Depsgraph *graph, struct ID *id);
 
-/* Get additional mesh CustomDataMask flags for the given object. */
-uint64_t DEG_get_customdata_mask_for_object(const struct Depsgraph *graph,
-                                            struct Object *object);
+/* Get additional mesh CustomData_MeshMasks flags for the given object. */
+void DEG_get_customdata_mask_for_object(const struct Depsgraph *graph,
+                                        struct Object *object,
+                                        struct CustomData_MeshMasks *r_mask);
 
 /* Get scene the despgraph is created for. */
 struct Scene *DEG_get_evaluated_scene(const struct Depsgraph *graph);