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, 13 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_customdata_types.h b/source/blender/makesdna/DNA_customdata_types.h
index 4bacfd15751..91412044e0e 100644
--- a/source/blender/makesdna/DNA_customdata_types.h
+++ b/source/blender/makesdna/DNA_customdata_types.h
@@ -190,6 +190,19 @@ typedef enum CustomDataType {
 #define CD_MASK_TESSLOOPNORMAL  (1LL << CD_TESSLOOPNORMAL)
 #define CD_MASK_CUSTOMLOOPNORMAL (1LL << CD_CUSTOMLOOPNORMAL)
 
+/** Data types that may be defined for all mesh elements types. */
+#define CD_MASK_GENERIC_DATA (CD_MASK_PROP_FLT | CD_MASK_PROP_INT | CD_MASK_PROP_STR)
+
+
+typedef struct CustomData_MeshMasks {
+	uint64_t vmask;
+	uint64_t emask;
+	uint64_t fmask;
+	uint64_t pmask;
+	uint64_t lmask;
+} CustomData_MeshMasks;
+
+
 /* CustomData.flag */
 enum {
 	/* Indicates layer should not be copied by CustomData_from_template or CustomData_copy_data */