initial merge of bmesh customdata layer code into trunk, ifdef'd out for now with USE_BMESH_FORWARD_COMPAT.

source/blender/blenkernel/intern/customdata.c

@@ -867,6 +867,30 @@ static const LayerTypeInfo LAYERTYPEINFO[CD_NUMTYPES] = {
 	{sizeof(float)*3, "", 0, NULL, NULL, NULL, NULL, NULL, NULL},
 	/* 24: CD_RECAST */
 	{sizeof(MRecast), "MRecast", 1,"Recast",NULL,NULL,NULL,NULL}
+
+#ifdef USE_BMESH_FORWARD_COMPAT
+	,
+/* BMESH ONLY */
+	/* 25: CD_MPOLY */
+	{sizeof(MPoly), "MPoly", 1, "NGon Face", NULL, NULL, NULL, NULL, NULL},
+	/* 26: CD_MLOOP */
+	{sizeof(MLoop), "MLoop", 1, "NGon Face-Vertex", NULL, NULL, NULL, NULL, NULL},
+	/* 27: CD_SHAPE_KEYINDEX */
+	{sizeof(int), "", 0, NULL, NULL, NULL, NULL, NULL, NULL},
+	/* 28: CD_SHAPEKEY */
+	{sizeof(float)*3, "", 0, "ShapeKey", NULL, NULL, layerInterp_shapekey},
+	/* 29: CD_BWEIGHT */
+	{sizeof(float), "", 0, "BevelWeight", NULL, NULL, layerInterp_bweight},
+	/* 30: CD_CREASE */
+	{sizeof(float), "", 0, "SubSurfCrease", NULL, NULL, layerInterp_bweight},
+	/* 31: CD_WEIGHT_MLOOPCOL */
+	{sizeof(MLoopCol), "MLoopCol", 1, "WeightLoopCol", NULL, NULL, layerInterp_mloopcol, NULL,
+	 layerDefault_mloopcol, layerEqual_mloopcol, layerMultiply_mloopcol, layerInitMinMax_mloopcol,
+	 layerAdd_mloopcol, layerDoMinMax_mloopcol, layerCopyValue_mloopcol},
+/* END BMESH ONLY */
+
+#endif /* USE_BMESH_FORWARD_COMPAT */
+
 };
 
 static const char *LAYERTYPENAMES[CD_NUMTYPES] = {
@@ -875,6 +899,13 @@ static const char *LAYERTYPENAMES[CD_NUMTYPES] = {
 	/* 10-14 */ "CDMFloatProperty", "CDMIntProperty","CDMStringProperty", "CDOrigSpace", "CDOrco",
 	/* 15-19 */ "CDMTexPoly", "CDMLoopUV", "CDMloopCol", "CDTangent", "CDMDisps",
 	/* 20-24 */"CDWeightMCol", "CDIDMCol", "CDTextureMCol", "CDClothOrco", "CDMRecast"
+
+#ifdef USE_BMESH_FORWARD_COMPAT
+	,
+	/* 25-29 */ "CDMPoly", "CDMLoop", "CDShapeKeyIndex", "CDShapeKey", "CDBevelWeight",
+	/* 30-31 */ "CDSubSurfCrease", "CDWeightLoopCol"
+
+#endif /* USE_BMESH_FORWARD_COMPAT */
 };
 
 const CustomDataMask CD_MASK_BAREMESH =

source/blender/makesdna/DNA_customdata_types.h

@@ -29,6 +29,7 @@
  *  \ingroup DNA
  */
 
+
 #ifndef DNA_CUSTOMDATA_TYPES_H
 #define DNA_CUSTOMDATA_TYPES_H
 
@@ -36,6 +37,8 @@
 extern "C" {
 #endif
 
+#include "DNA_defs.h" /* USE_BMESH_FORWARD_COMPAT */
+
 /** descriptor and storage for a custom data layer */
 typedef struct CustomDataLayer {
 	int type;       /* type of data in layer */
@@ -94,8 +97,27 @@ typedef struct CustomData {
 #define CD_TEXTURE_MCOL	22
 #define CD_CLOTH_ORCO	23
 #define CD_RECAST		24
+
+#ifdef USE_BMESH_FORWARD_COMPAT
+
+/* BMESH ONLY START */
+#define CD_MPOLY		25
+#define CD_MLOOP		26
+#define CD_SHAPE_KEYINDEX	27
+#define CD_SHAPEKEY		28
+#define CD_BWEIGHT		29
+#define CD_CREASE		30
+#define CD_WEIGHT_MLOOPCOL	31
+/* BMESH ONLY END */
+
+#define CD_NUMTYPES		32
+
+#else
+
 #define CD_NUMTYPES		25
 
+#endif
+
 /* Bits for CustomDataMask */
 #define CD_MASK_MVERT		(1 << CD_MVERT)
 #define CD_MASK_MSTICKY		(1 << CD_MSTICKY)
@@ -121,6 +143,20 @@ typedef struct CustomData {
 #define CD_MASK_CLOTH_ORCO	(1 << CD_CLOTH_ORCO)
 #define CD_MASK_RECAST		(1 << CD_RECAST)
 
+#ifdef USE_BMESH_FORWARD_COMPAT
+
+/* BMESH ONLY START */
+#define CD_MASK_MPOLY		(1 << CD_MPOLY)
+#define CD_MASK_MLOOP		(1 << CD_MLOOP)
+#define CD_MASK_SHAPE_KEYINDEX	(1 << CD_SHAPE_KEYINDEX)
+#define CD_MASK_SHAPEKEY	(1 << CD_SHAPEKEY)
+#define CD_MASK_BWEIGHT		(1 << CD_BWEIGHT)
+#define CD_MASK_CREASE		(1 << CD_CREASE)
+#define CD_MASK_WEIGHT_MLOOPCOL (1 << CD_WEIGHT_MLOOPCOL)
+/* BMESH ONLY END */
+
+#endif
+
 /* CustomData.flag */
 
 /* indicates layer should not be copied by CustomData_from_template or

source/blender/makesdna/DNA_defs.h

@@ -45,4 +45,6 @@
 /* hrmf, we need a better include then this */
 #include "../blenloader/BLO_sys_types.h" /* needed for int64_t only! */
 
+// #define USE_BMESH_FORWARD_COMPAT
+
 #endif /* DNA_DEFS_H */

source/blender/makesdna/DNA_mesh_types.h

@@ -36,6 +36,8 @@
 #include "DNA_ID.h"
 #include "DNA_customdata_types.h"
 
+#include "DNA_defs.h" /* USE_BMESH_FORWARD_COMPAT */
+
 struct DerivedMesh;
 struct Ipo;
 struct Key;

source/blender/makesdna/DNA_meshdata_types.h

@@ -72,6 +72,27 @@ typedef struct MCol {
 	char a, r, g, b;	
 } MCol;
 
+#ifdef USE_BMESH_FORWARD_COMPAT
+
+/*new face structure, replaces MFace, which is now
+  only used for storing tesselations.*/
+typedef struct MPoly {
+	/* offset into loop array and number of loops in the face */
+	int loopstart;
+	int totloop; /* keep signed since we need to subtract when getting the previous loop */
+	short mat_nr;
+	char flag, pad;
+} MPoly;
+
+/*the e here is because we want to move away from
+  relying on edge hashes.*/
+typedef struct MLoop {
+	unsigned int v; /*vertex index*/
+	unsigned int e; /*edge index*/
+} MLoop;
+
+#endif /* USE_BMESH_FORWARD_COMPAT */
+
 /*bmesh custom data stuff*/
 typedef struct MTexPoly {
 	struct Image *tpage;