Add Custom Loop Normals.

This is the core code for it, tools (datatransfer and modifier) will come in next commits).
RNA api is already there, though.

See the code for details, but basically, we define, for each 'smooth fan'
(which is a set of adjacent loops around a same vertex that are smooth, i.e. have a single same normal),
a 'loop normal space' (or lnor space), using auto-computed normal and relevant edges, and store
custom normal as two angular factors inside that space. This allows to have custom normals
'following' deformations of the geometry, and to only save two shorts per loop in new clnor CDLayer.

Normal manipulation (editing, mixing, interpolating, etc.) shall always happen with plain 3D vectors normals,
and be converted back into storage format at the end.

Clnor computation has also been threaded (at least for Mesh case, not for BMesh), since the process can
be rather heavy with high poly meshes.

Also, bumping subversion, and fix mess in 2.70 versioning code.

1 files changed, 5 insertions, 2 deletions

diff --git a/source/blender/makesdna/DNA_customdata_types.h b/source/blender/makesdna/DNA_customdata_types.h
index 7fedad2546c..74f5967db13 100644
--- a/source/blender/makesdna/DNA_customdata_types.h
+++ b/source/blender/makesdna/DNA_customdata_types.h
@@ -63,9 +63,10 @@ typedef struct CustomDataExternal {
  * layers, each with a data type (e.g. MTFace, MDeformVert, etc.). */
 typedef struct CustomData {
 	CustomDataLayer *layers;      /* CustomDataLayers, ordered by type */
-	int typemap[41];              /* runtime only! - maps types to indices of first layer of that type,
+	int typemap[42];              /* runtime only! - maps types to indices of first layer of that type,
 	                               * MUST be >= CD_NUMTYPES, but we cant use a define here.
 	                               * Correct size is ensured in CustomData_update_typemap assert() */
+	int pad_i1;
 	int totlayer, maxlayer;       /* number of layers, size of layers array */
 	int totsize;                  /* in editmode, total size of all data layers */
 	struct BLI_mempool *pool;     /* (BMesh Only): Memory pool for allocation of blocks */
@@ -119,8 +120,9 @@ typedef enum CustomDataType {
 	CD_FREESTYLE_FACE   = 38,
 	CD_MLOOPTANGENT     = 39,
 	CD_TESSLOOPNORMAL   = 40,
+	CD_CUSTOMLOOPNORMAL = 41,
 
-	CD_NUMTYPES         = 41
+	CD_NUMTYPES         = 42
 } CustomDataType;
 
 /* Bits for CustomDataMask */
@@ -167,6 +169,7 @@ typedef enum CustomDataType {
 #define CD_MASK_FREESTYLE_FACE	(1LL << CD_FREESTYLE_FACE)
 #define CD_MASK_MLOOPTANGENT    (1LL << CD_MLOOPTANGENT)
 #define CD_MASK_TESSLOOPNORMAL  (1LL << CD_TESSLOOPNORMAL)
+#define CD_MASK_CUSTOMLOOPNORMAL (1LL << CD_CUSTOMLOOPNORMAL)
 
 /* CustomData.flag */
 enum {