Added BKE_mesh_new()

This function creates a Mesh struct with a number of vertices/edges/etc.
It allocates the minimal number of CD layers needed.

Currently not yet used, but will be soon in the upcoming
BKE_new_mesh_from_curve_displist().

2 files changed, 38 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_mesh.h b/source/blender/blenkernel/BKE_mesh.h
index afb087ed822..41b2b875d9a 100644
--- a/source/blender/blenkernel/BKE_mesh.h
+++ b/source/blender/blenkernel/BKE_mesh.h
@@ -101,6 +101,7 @@ struct Mesh *BKE_mesh_copy(struct Main *bmain, const struct Mesh *me);
 void BKE_mesh_update_customdata_pointers(struct Mesh *me, const bool do_ensure_tess_cd);
 void BKE_mesh_ensure_skin_customdata(struct Mesh *me);
 
+struct Mesh *BKE_mesh_new(int numVerts, int numEdges, int numTessFaces,int numLoops, int numPolys);
 struct Mesh * BKE_mesh_from_template(
         const struct Mesh *me_src,
         int numVerts, int numEdges, int numTessFaces,
diff --git a/source/blender/blenkernel/intern/mesh.c b/source/blender/blenkernel/intern/mesh.c
index 3163ea6551e..177a8433eab 100644
--- a/source/blender/blenkernel/intern/mesh.c
+++ b/source/blender/blenkernel/intern/mesh.c
@@ -51,6 +51,7 @@
 #include "BKE_main.h"
 #include "BKE_DerivedMesh.h"
 #include "BKE_global.h"
+#include "BKE_idcode.h"
 #include "BKE_mesh.h"
 #include "BKE_mesh_mapping.h"
 #include "BKE_displist.h"
@@ -614,6 +615,42 @@ void BKE_mesh_copy_data(Main *bmain, Mesh *me_dst, const Mesh *me_src, const int
 	}
 }
 
+Mesh *BKE_mesh_new(int numVerts, int numEdges, int numTessFaces,int numLoops, int numPolys)
+{
+	Mesh *mesh = BKE_libblock_alloc(NULL, ID_ME,
+	                                BKE_idcode_to_name(ID_ME),
+	                                LIB_ID_CREATE_NO_MAIN |
+	                                LIB_ID_CREATE_NO_USER_REFCOUNT |
+								    LIB_ID_CREATE_NO_DEG_TAG);
+	BKE_libblock_init_empty(&mesh->id);
+
+	/* don't use CustomData_reset(...); because we dont want to touch customdata */
+	copy_vn_i(mesh->vdata.typemap, CD_NUMTYPES, -1);
+	copy_vn_i(mesh->edata.typemap, CD_NUMTYPES, -1);
+	copy_vn_i(mesh->fdata.typemap, CD_NUMTYPES, -1);
+	copy_vn_i(mesh->ldata.typemap, CD_NUMTYPES, -1);
+	copy_vn_i(mesh->pdata.typemap, CD_NUMTYPES, -1);
+
+	CustomData_add_layer(&mesh->vdata, CD_ORIGINDEX, CD_CALLOC, NULL, numVerts);
+	CustomData_add_layer(&mesh->edata, CD_ORIGINDEX, CD_CALLOC, NULL, numEdges);
+	CustomData_add_layer(&mesh->fdata, CD_ORIGINDEX, CD_CALLOC, NULL, numTessFaces);
+	CustomData_add_layer(&mesh->pdata, CD_ORIGINDEX, CD_CALLOC, NULL, numPolys);
+
+	CustomData_add_layer(&mesh->vdata, CD_MVERT, CD_CALLOC, NULL, numVerts);
+	CustomData_add_layer(&mesh->edata, CD_MEDGE, CD_CALLOC, NULL, numEdges);
+	CustomData_add_layer(&mesh->fdata, CD_MFACE, CD_CALLOC, NULL, numTessFaces);
+	CustomData_add_layer(&mesh->ldata, CD_MLOOP, CD_CALLOC, NULL, numLoops);
+	CustomData_add_layer(&mesh->pdata, CD_MPOLY, CD_CALLOC, NULL, numPolys);
+
+	mesh->mvert = CustomData_get_layer(&mesh->vdata, CD_MVERT);
+	mesh->medge = CustomData_get_layer(&mesh->edata, CD_MEDGE);
+	mesh->mface = CustomData_get_layer(&mesh->fdata, CD_MFACE);
+	mesh->mloop = CustomData_get_layer(&mesh->ldata, CD_MLOOP);
+	mesh->mpoly = CustomData_get_layer(&mesh->pdata, CD_MPOLY);
+
+	return mesh;
+}
+
 static Mesh *mesh_from_template_ex(
         const Mesh *me_src,
         int numVerts, int numEdges, int numTessFaces,