initial bmesh python api.

corrently allows to create and loop over verts/edges/faces, access selection and selection modes.

this is still WIP, access to face, edge verts is still missing, no access to UV's, no access to editing operations yet.

When the api is ready it will be documented by sphinx like mathutils, blf, aud.

source/blender/python/bmesh/bmesh_py_api.c

@@ -0,0 +1,97 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2011 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Campbell Barton
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/python/generic/blf_py_api.c
+ *  \ingroup pygen
+ *
+ * This file defines the 'bme' bmesh main module.
+ */
+
+#include <Python.h>
+
+#include "bmesh.h"
+
+#include "bmesh_py_types.h"
+
+#include "BLI_utildefines.h"
+
+#include "BKE_tessmesh.h"
+
+#include "DNA_mesh_types.h"
+
+#include "../generic/py_capi_utils.h"
+
+#include "bmesh_py_api.h" /* own include */
+
+PyDoc_STRVAR(bpy_bm_from_mesh_doc,
+".. method:: from_mesh(mesh)\n"
+"\n"
+"   todo.\n"
+);
+
+static PyObject *bpy_bm_from_mesh(PyObject *UNUSED(self), PyObject *value)
+{
+	Mesh *me = PyC_RNA_AsPointer(value, "Mesh");
+
+	/* temp! */
+	if (!me->edit_btmesh) {
+		PyErr_SetString(PyExc_ValueError,
+		                "Mesh is not in editmode");
+		return NULL;
+	}
+
+	return BPy_BMesh_CreatePyObject(me->edit_btmesh->bm);
+}
+
+static struct PyMethodDef BPy_BM_methods[] = {
+	{"from_mesh", (PyCFunction)bpy_bm_from_mesh, METH_O, bpy_bm_from_mesh_doc},
+	{NULL, NULL, 0, NULL}
+};
+
+PyDoc_STRVAR(BPy_BM_doc,
+"This module provides access to blenders bmesh data structures."
+);
+static struct PyModuleDef BPy_BM_module_def = {
+	PyModuleDef_HEAD_INIT,
+	"bme",  /* m_name */
+	BPy_BM_doc,  /* m_doc */
+	0,  /* m_size */
+	BPy_BM_methods,  /* m_methods */
+	NULL,  /* m_reload */
+	NULL,  /* m_traverse */
+	NULL,  /* m_clear */
+	NULL,  /* m_free */
+};
+
+PyObject *BPyInit_bmesh(void)
+{
+	PyObject *submodule;
+
+	BPy_BM_init_types();
+
+	submodule = PyModule_Create(&BPy_BM_module_def);
+
+	return submodule;
+}