Quite a large one this time... but now we have:

Edges in Mesh
- adds automatic when you use creases. For other situations; call the
  void make_edges(Mesh *me) in mesh.c. Of course, once in editmode the
  edges are automatically recreated.
- in F9 buttons you can add/remove edges too
- both for Mesh and DisplistMesh, so it speeds up drawing quite some in
  wireframe
- render for edges can't work... edges have no material nor tface nor col..
  so here still the faces are rendered in wire

Creases in Subsurf
- based on the code by Chris McFarlen
- main changes is that now edges are used, saving quite some data in file
- use SHIFT+E in editmode to set edges-sharpness. values go from 0-1
- in F9 buttons you can set draw-crease mode. It draws now blended from
  wire color to edge-select color (as provided in Theme)

Known issue: setting sharpness on 1 cube (subdiv 2) gives weird results
with some values... Chris, can you check?

Further; code cleanups, changing 0 in NULL when needed, no warnings, etc etc

3 files changed, 42 insertions, 28 deletions

diff --git a/source/blender/makesdna/DNA_curve_types.h b/source/blender/makesdna/DNA_curve_types.h
index 734b0904102..2caff861bc1 100644
--- a/source/blender/makesdna/DNA_curve_types.h
+++ b/source/blender/makesdna/DNA_curve_types.h
@@ -181,7 +181,7 @@ typedef struct IpoCurve {
 #define CU_FLUSH		3
 
 /* flag (nurb) */
-#define CU_SMOOTH		ME_SMOOTH
+#define CU_SMOOTH		1
 
 /* type (nurb) */
 #define CU_POLY			0
diff --git a/source/blender/makesdna/DNA_mesh_types.h b/source/blender/makesdna/DNA_mesh_types.h
index b80bdf62b2c..674c144923d 100644
--- a/source/blender/makesdna/DNA_mesh_types.h
+++ b/source/blender/makesdna/DNA_mesh_types.h
@@ -39,6 +39,7 @@ struct Ipo;
 struct Key;
 struct Material;
 struct MVert;
+struct MEdge;
 struct MCol;
 struct MSticky;
 struct Mesh;
@@ -69,6 +70,7 @@ typedef struct Mesh {
 
 	void *mface, *dface, *tface;
 	struct MVert *mvert;
+	struct MEdge *medge;
 	struct MDeformVert *dvert;	/* __NLA */
 	struct MCol *mcol;
 	struct MSticky *msticky;
@@ -78,20 +80,21 @@ typedef struct Mesh {
 	struct OcInfo *oc;		/* not written in file */
 	void *sumohandle;
 
-	int totvert, totface;
-
+	int totvert, totedge, totface;
 	int texflag;
+	
 	float loc[3];
 	float size[3];
 	float rot[3];
 	
 	short smoothresh, flag;
+
 	short subdiv, subdivr, subdivdone;
 	short totcol;
 	short subsurftype; 
 	short reserved1;	/* Padding */
 
-	float cubemapsize, rtf;
+	float cubemapsize;
 
 } Mesh;
 
@@ -117,25 +120,6 @@ typedef struct Mesh {
 #define ME_CC_SUBSURF 		0
 #define ME_SIMPLE_SUBSURF 	1
 
-/* puno = vertexnormal (mface) */
-#define ME_FLIPV1		1
-#define ME_FLIPV2		2
-#define ME_FLIPV3		4
-#define ME_FLIPV4		8
-#define ME_PROJXY		16
-#define ME_PROJXZ		32
-#define ME_PROJYZ		64
-
-/* edcode (mface) */
-#define ME_V1V2			1
-#define ME_V2V3			2
-#define ME_V3V1			4
-#define ME_V3V4			4
-#define ME_V4V1			8
-
-/* flag (mface) */
-#define ME_SMOOTH		1
-
 
 #define TF_DYNAMIC		1
 /* #define TF_INVISIBLE	2 */
@@ -169,11 +153,6 @@ typedef struct Mesh {
 #define TF_ALPHA	2
 #define TF_SUB		3
 
-/* mvert->flag (1=select) */
-#define ME_SPHERETEST	2
-#define ME_SPHERETEMP	4
-#define ME_HIDE			16
-
 #define MESH_MAX_VERTS 2000000000L
 
 #endif
diff --git a/source/blender/makesdna/DNA_meshdata_types.h b/source/blender/makesdna/DNA_meshdata_types.h
index 5eaba97fc63..04de27f58b0 100644
--- a/source/blender/makesdna/DNA_meshdata_types.h
+++ b/source/blender/makesdna/DNA_meshdata_types.h
@@ -40,6 +40,12 @@ typedef struct MFace {
 	char edcode, flag;
 } MFace;
 
+typedef struct MEdge {
+	unsigned int v1, v2;
+	char crease, pad;
+	short flag;
+} MEdge;
+
 typedef struct MDeformWeight {
 	int				def_nr;
 	float			weight;
@@ -66,4 +72,33 @@ typedef struct MSticky {
 	float co[2];
 } MSticky;
 
+/* mvert->flag (1=SELECT) */
+#define ME_SPHERETEST	2
+#define ME_SPHERETEMP	4
+#define ME_HIDE			16
+
+/* medge->flag (1=SELECT)*/
+#define ME_EDGEDRAW		2
+
+
+/* puno = vertexnormal (mface) */
+#define ME_FLIPV1		1
+#define ME_FLIPV2		2
+#define ME_FLIPV3		4
+#define ME_FLIPV4		8
+#define ME_PROJXY		16
+#define ME_PROJXZ		32
+#define ME_PROJYZ		64
+
+/* edcode (mface) */
+#define ME_V1V2			1
+#define ME_V2V3			2
+#define ME_V3V1			4
+#define ME_V3V4			4
+#define ME_V4V1			8
+
+/* flag (mface) */
+#define ME_SMOOTH		1
+
+
 #endif