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, 4 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_object_types.h b/source/blender/makesdna/DNA_object_types.h
index eac8b82d6ea..3b09801b4b7 100644
--- a/source/blender/makesdna/DNA_object_types.h
+++ b/source/blender/makesdna/DNA_object_types.h
@@ -28,6 +28,7 @@
 #include "DNA_object_enums.h"
 
 #include "DNA_defs.h"
+#include "DNA_customdata_types.h"
 #include "DNA_listBase.h"
 #include "DNA_ID.h"
 #include "DNA_action_types.h" /* bAnimVizSettings */
@@ -122,13 +123,15 @@ typedef struct LodLevel {
  * TODO(sergey): Consider moving it to more appropriate place. */
 struct ObjectBBoneDeform;
 
+struct CustomData_MeshMasks;
+
 /* Not saved in file! */
 typedef struct Object_Runtime {
 	/**
 	 * The custom data layer mask that was last used
 	 * to calculate mesh_eval and mesh_deform_eval.
 	 */
-	uint64_t last_data_mask;
+	CustomData_MeshMasks last_data_mask;
 
 	/** Did last modifier stack generation need mapping support? */
 	char last_need_mapping;