/blender-2.63a/source/blender/blenkernel/intern/subsurf_ccg.c

/*
 * ***** 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) 2005 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/blenkernel/intern/subsurf_ccg.c
 *  \ingroup bke
 */


#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <float.h>

#include "MEM_guardedalloc.h"

#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"

#include "BLI_utildefines.h"
#include "BLI_bitmap.h"
#include "BLI_blenlib.h"
#include "BLI_edgehash.h"
#include "BLI_math.h"
#include "BLI_memarena.h"
#include "BLI_pbvh.h"

#include "BKE_cdderivedmesh.h"
#include "BKE_global.h"
#include "BKE_mesh.h"
#include "BKE_modifier.h"
#include "BKE_multires.h"
#include "BKE_paint.h"
#include "BKE_scene.h"
#include "BKE_subsurf.h"
#include "BKE_tessmesh.h"

#include "PIL_time.h"
#include "BLI_array.h"

#include "GL/glew.h"

#include "GPU_draw.h"
#include "GPU_extensions.h"
#include "GPU_material.h"

#include "CCGSubSurf.h"

extern GLubyte stipple_quarttone[128]; /* glutil.c, bad level data */

static CCGDerivedMesh *getCCGDerivedMesh(CCGSubSurf *ss,
                                         int drawInteriorEdges,
                                         int useSubsurfUv,
                                         DerivedMesh *dm);
static int ccgDM_use_grid_pbvh(CCGDerivedMesh *ccgdm);

///

static void *arena_alloc(CCGAllocatorHDL a, int numBytes)
{
	return BLI_memarena_alloc(a, numBytes);
}

static void *arena_realloc(CCGAllocatorHDL a, void *ptr, int newSize, int oldSize)
{
	void *p2 = BLI_memarena_alloc(a, newSize);
	if (ptr) {
		memcpy(p2, ptr, oldSize);
	}
	return p2;
}

static void arena_free(CCGAllocatorHDL UNUSED(a), void *UNUSED(ptr))
{
	/* do nothing */
}

static void arena_release(CCGAllocatorHDL a)
{
	BLI_memarena_free(a);
}

typedef enum {
	CCG_USE_AGING = 1,
	CCG_USE_ARENA = 2,
	CCG_CALC_NORMALS = 4
} CCGFlags;

static CCGSubSurf *_getSubSurf(CCGSubSurf *prevSS, int subdivLevels, CCGFlags flags)
{
	CCGMeshIFC ifc;
	CCGSubSurf *ccgSS;
	int useAging = !!(flags & CCG_USE_AGING);
	int useArena = flags & CCG_USE_ARENA;

	/* subdivLevels==0 is not allowed */
	subdivLevels = MAX2(subdivLevels, 1);

	if (prevSS) {
		int oldUseAging;

		ccgSubSurf_getUseAgeCounts(prevSS, &oldUseAging, NULL, NULL, NULL);

		if (oldUseAging != useAging) {
			ccgSubSurf_free(prevSS);
		}
		else {
			ccgSubSurf_setSubdivisionLevels(prevSS, subdivLevels);

			return prevSS;
		}
	}

	if (useAging) {
		ifc.vertUserSize = ifc.edgeUserSize = ifc.faceUserSize = 12;
	}
	else {
		ifc.vertUserSize = ifc.edgeUserSize = ifc.faceUserSize = 8;
	}
	ifc.vertDataSize = sizeof(float) * (flags & CCG_CALC_NORMALS ? 6 : 3);

	if (useArena) {
		CCGAllocatorIFC allocatorIFC;
		CCGAllocatorHDL allocator = BLI_memarena_new((1 << 16), "subsurf arena");

		allocatorIFC.alloc = arena_alloc;
		allocatorIFC.realloc = arena_realloc;
		allocatorIFC.free = arena_free;
		allocatorIFC.release = arena_release;

		ccgSS = ccgSubSurf_new(&ifc, subdivLevels, &allocatorIFC, allocator);
	}
	else {
		ccgSS = ccgSubSurf_new(&ifc, subdivLevels, NULL, NULL);
	}

	if (useAging) {
		ccgSubSurf_setUseAgeCounts(ccgSS, 1, 8, 8, 8);
	}

	if (flags & CCG_CALC_NORMALS)
		ccgSubSurf_setCalcVertexNormals(ccgSS, 1, offsetof(DMGridData, no));
	else
		ccgSubSurf_setCalcVertexNormals(ccgSS, 0, 0);

	return ccgSS;
}

static int getEdgeIndex(CCGSubSurf *ss, CCGEdge *e, int x, int edgeSize)
{
	CCGVert *v0 = ccgSubSurf_getEdgeVert0(e);
	CCGVert *v1 = ccgSubSurf_getEdgeVert1(e);
	int v0idx = *((int *) ccgSubSurf_getVertUserData(ss, v0));
	int v1idx = *((int *) ccgSubSurf_getVertUserData(ss, v1));
	int edgeBase = *((int *) ccgSubSurf_getEdgeUserData(ss, e));

	if (x == 0) {
		return v0idx;
	}
	else if (x == edgeSize - 1) {
		return v1idx;
	}
	else {
		return edgeBase + x - 1;
	}
}

static int getFaceIndex(CCGSubSurf *ss, CCGFace *f, int S, int x, int y, int edgeSize, int gridSize)
{
	int faceBase = *((int *) ccgSubSurf_getFaceUserData(ss, f));
	int numVerts = ccgSubSurf_getFaceNumVerts(f);

	if (x == gridSize - 1 && y == gridSize - 1) {
		CCGVert *v = ccgSubSurf_getFaceVert(f, S);
		return *((int *) ccgSubSurf_getVertUserData(ss, v));
	}
	else if (x == gridSize - 1) {
		CCGVert *v = ccgSubSurf_getFaceVert(f, S);
		CCGEdge *e = ccgSubSurf_getFaceEdge(f, S);
		int edgeBase = *((int *) ccgSubSurf_getEdgeUserData(ss, e));
		if (v == ccgSubSurf_getEdgeVert0(e)) {
			return edgeBase + (gridSize - 1 - y) - 1;
		}
		else {
			return edgeBase + (edgeSize - 2 - 1) - ((gridSize - 1 - y) - 1);
		}
	}
	else if (y == gridSize - 1) {
		CCGVert *v = ccgSubSurf_getFaceVert(f, S);
		CCGEdge *e = ccgSubSurf_getFaceEdge(f, (S + numVerts - 1) % numVerts);
		int edgeBase = *((int *) ccgSubSurf_getEdgeUserData(ss, e));
		if (v == ccgSubSurf_getEdgeVert0(e)) {
			return edgeBase + (gridSize - 1 - x) - 1;
		}
		else {
			return edgeBase + (edgeSize - 2 - 1) - ((gridSize - 1 - x) - 1);
		}
	}
	else if (x == 0 && y == 0) {
		return faceBase;
	}
	else if (x == 0) {
		S = (S + numVerts - 1) % numVerts;
		return faceBase + 1 + (gridSize - 2) * S + (y - 1);
	}
	else if (y == 0) {
		return faceBase + 1 + (gridSize - 2) * S + (x - 1);
	}
	else {
		return faceBase + 1 + (gridSize - 2) * numVerts + S * (gridSize - 2) * (gridSize - 2) + (y - 1) * (gridSize - 2) + (x - 1);
	}
}

static void get_face_uv_map_vert(UvVertMap *vmap, struct MPoly *mpoly, struct MLoop *ml, int fi, CCGVertHDL *fverts)
{
	UvMapVert *v, *nv;
	int j, nverts = mpoly[fi].totloop;

	for (j = 0; j < nverts; j++) {
		for (nv = v = get_uv_map_vert(vmap, ml[j].v); v; v = v->next) {
			if (v->separate)
				nv = v;
			if (v->f == fi)
				break;
		}

		fverts[j] = SET_INT_IN_POINTER(mpoly[nv->f].loopstart + nv->tfindex);
	}
}

static int ss_sync_from_uv(CCGSubSurf *ss, CCGSubSurf *origss, DerivedMesh *dm, MLoopUV *mloopuv)
{
	MPoly *mpoly = dm->getPolyArray(dm);
	MLoop *mloop = dm->getLoopArray(dm);
	MVert *mvert = dm->getVertArray(dm);
	int totvert = dm->getNumVerts(dm);
	int totface = dm->getNumPolys(dm);
	int i, j, seam;
	UvMapVert *v;
	UvVertMap *vmap;
	float limit[2];
	CCGVertHDL *fverts = NULL;
	BLI_array_declare(fverts);
	EdgeHash *ehash;
	float creaseFactor = (float)ccgSubSurf_getSubdivisionLevels(ss);
	float uv[3] = {0.0f, 0.0f, 0.0f}; /* only first 2 values are written into */

	limit[0] = limit[1] = STD_UV_CONNECT_LIMIT;
	vmap = make_uv_vert_map(mpoly, mloop, mloopuv, totface, totvert, 0, limit);
	if (!vmap)
		return 0;
	
	ccgSubSurf_initFullSync(ss);

	/* create vertices */
	for (i = 0; i < totvert; i++) {
		if (!get_uv_map_vert(vmap, i))
			continue;

		for (v = get_uv_map_vert(vmap, i)->next; v; v = v->next)
			if (v->separate)
				break;

		seam = (v != NULL) || ((mvert + i)->flag & ME_VERT_MERGED);

		for (v = get_uv_map_vert(vmap, i); v; v = v->next) {
			if (v->separate) {
				CCGVert *ssv;
				int loopid = mpoly[v->f].loopstart + v->tfindex;
				CCGVertHDL vhdl = SET_INT_IN_POINTER(loopid);

				copy_v2_v2(uv, mloopuv[loopid].uv);

				ccgSubSurf_syncVert(ss, vhdl, uv, seam, &ssv);
			}
		}
	}

	/* create edges */
	ehash = BLI_edgehash_new();

	for (i = 0; i < totface; i++) {
		MPoly *mp = &((MPoly *) mpoly)[i];
		int nverts = mp->totloop;
		CCGFace *origf = ccgSubSurf_getFace(origss, SET_INT_IN_POINTER(i));
		/* unsigned int *fv = &mp->v1; */
		MLoop *ml = mloop + mp->loopstart;

		BLI_array_empty(fverts);
		BLI_array_growitems(fverts, nverts);

		get_face_uv_map_vert(vmap, mpoly, ml, i, fverts);

		for (j = 0; j < nverts; j++) {
			int v0 = GET_INT_FROM_POINTER(fverts[j]);
			int v1 = GET_INT_FROM_POINTER(fverts[(j + 1) % nverts]);
			MVert *mv0 = mvert + (ml[j].v);
			MVert *mv1 = mvert + (ml[((j + 1) % nverts)].v);

			if (!BLI_edgehash_haskey(ehash, v0, v1)) {
				CCGEdge *e, *orige = ccgSubSurf_getFaceEdge(origf, j);
				CCGEdgeHDL ehdl = SET_INT_IN_POINTER(mp->loopstart + j);
				float crease;

				if ((mv0->flag & mv1->flag) & ME_VERT_MERGED)
					crease = creaseFactor;
				else
					crease = ccgSubSurf_getEdgeCrease(orige);

				ccgSubSurf_syncEdge(ss, ehdl, fverts[j], fverts[(j + 1) % nverts], crease, &e);
				BLI_edgehash_insert(ehash, v0, v1, NULL);
			}
		}
	}

	BLI_edgehash_free(ehash, NULL);

	/* create faces */
	for (i = 0; i < totface; i++) {
		MPoly *mp = &mpoly[i];
		MLoop *ml = &mloop[mp->loopstart];
		int nverts = mp->totloop;
		CCGFace *f;

		BLI_array_empty(fverts);
		BLI_array_growitems(fverts, nverts);

		get_face_uv_map_vert(vmap, mpoly, ml, i, fverts);
		ccgSubSurf_syncFace(ss, SET_INT_IN_POINTER(i), nverts, fverts, &f);
	}

	BLI_array_free(fverts);

	free_uv_vert_map(vmap);
	ccgSubSurf_processSync(ss);

	return 1;
}

static void set_subsurf_uv(CCGSubSurf *ss, DerivedMesh *dm, DerivedMesh *result, int n)
{
	CCGSubSurf *uvss;
	CCGFace **faceMap;
	MTFace *tf;
	MLoopUV *mluv;
	CCGFaceIterator *fi;
	int index, gridSize, gridFaces, /*edgeSize,*/ totface, x, y, S;
	MLoopUV *dmloopuv = CustomData_get_layer_n(&dm->loopData, CD_MLOOPUV, n);
	/* need to update both CD_MTFACE & CD_MLOOPUV, hrmf, we could get away with
	 * just tface except applying the modifier then looses subsurf UV */
	MTFace *tface = CustomData_get_layer_n(&result->faceData, CD_MTFACE, n);
	MLoopUV *mloopuv = CustomData_get_layer_n(&result->loopData, CD_MLOOPUV, n);

	if (!dmloopuv || (!tface && !mloopuv))
		return;

	/* create a CCGSubSurf from uv's */
	uvss = _getSubSurf(NULL, ccgSubSurf_getSubdivisionLevels(ss), CCG_USE_ARENA);

	if (!ss_sync_from_uv(uvss, ss, dm, dmloopuv)) {
		ccgSubSurf_free(uvss);
		return;
	}

	/* get some info from CCGSubSurf */
	totface = ccgSubSurf_getNumFaces(uvss);
	/* edgeSize = ccgSubSurf_getEdgeSize(uvss); */ /*UNUSED*/
	gridSize = ccgSubSurf_getGridSize(uvss);
	gridFaces = gridSize - 1;

	/* make a map from original faces to CCGFaces */
	faceMap = MEM_mallocN(totface * sizeof(*faceMap), "facemapuv");

	fi = ccgSubSurf_getFaceIterator(uvss);
	for (; !ccgFaceIterator_isStopped(fi); ccgFaceIterator_next(fi)) {
		CCGFace *f = ccgFaceIterator_getCurrent(fi);
		faceMap[GET_INT_FROM_POINTER(ccgSubSurf_getFaceFaceHandle(f))] = f;
	}
	ccgFaceIterator_free(fi);

	/* load coordinates from uvss into tface */
	tf = tface;
	mluv = mloopuv;

	for (index = 0; index < totface; index++) {
		CCGFace *f = faceMap[index];
		int numVerts = ccgSubSurf_getFaceNumVerts(f);

		for (S = 0; S < numVerts; S++) {
			float (*faceGridData)[3] = ccgSubSurf_getFaceGridDataArray(uvss, f, S);

			for (y = 0; y < gridFaces; y++) {
				for (x = 0; x < gridFaces; x++) {
					float *a = faceGridData[(y + 0) * gridSize + x + 0];
					float *b = faceGridData[(y + 0) * gridSize + x + 1];
					float *c = faceGridData[(y + 1) * gridSize + x + 1];
					float *d = faceGridData[(y + 1) * gridSize + x + 0];

					if (tf) {
						copy_v2_v2(tf->uv[0], a);
						copy_v2_v2(tf->uv[1], d);
						copy_v2_v2(tf->uv[2], c);
						copy_v2_v2(tf->uv[3], b);
						tf++;
					}

					if (mluv) {
						copy_v2_v2(mluv[0].uv, a);
						copy_v2_v2(mluv[1].uv, d);
						copy_v2_v2(mluv[2].uv, c);
						copy_v2_v2(mluv[3].uv, b);
						mluv += 4;
					}

				}
			}
		}
	}

	ccgSubSurf_free(uvss);
	MEM_freeN(faceMap);
}

/* face weighting */
typedef struct FaceVertWeightEntry {
	FaceVertWeight *weight;
	float *w;
	int valid;
} FaceVertWeightEntry;

typedef struct WeightTable {
	FaceVertWeightEntry *weight_table;
	int len;
} WeightTable;

static float *get_ss_weights(WeightTable *wtable, int gridCuts, int faceLen)
{
	int x, y, i, j;
	float *w, w1, w2, w4, fac, fac2, fx, fy;

	if (wtable->len <= faceLen) {
		void *tmp = MEM_callocN(sizeof(FaceVertWeightEntry) * (faceLen + 1), "weight table alloc 2");
		
		if (wtable->len) {
			memcpy(tmp, wtable->weight_table, sizeof(FaceVertWeightEntry) * wtable->len);
			MEM_freeN(wtable->weight_table);
		}
		
		wtable->weight_table = tmp;
		wtable->len = faceLen + 1;
	}

	if (!wtable->weight_table[faceLen].valid) {
		wtable->weight_table[faceLen].valid = 1;
		wtable->weight_table[faceLen].w = w = MEM_callocN(sizeof(float) * faceLen * faceLen * (gridCuts + 2) * (gridCuts + 2), "weight table alloc");
		fac = 1.0f / (float)faceLen;

		for (i = 0; i < faceLen; i++) {
			for (x = 0; x < gridCuts + 2; x++) {
				for (y = 0; y < gridCuts + 2; y++) {
					fx = 0.5f - (float)x / (float)(gridCuts + 1) / 2.0f;
					fy = 0.5f - (float)y / (float)(gridCuts + 1) / 2.0f;
				
					fac2 = faceLen - 4;
					w1 = (1.0f - fx) * (1.0f - fy) + (-fac2 * fx * fy * fac);
					w2 = (1.0f - fx + fac2 * fx * -fac) * (fy);
					w4 = (fx) * (1.0f - fy + -fac2 * fy * fac);

					fac2 = 1.0f - (w1 + w2 + w4);
					fac2 = fac2 / (float)(faceLen - 3);
					for (j = 0; j < faceLen; j++)
						w[j] = fac2;
					
					w[i] = w1;
					w[(i - 1 + faceLen) % faceLen] = w2;
					w[(i + 1) % faceLen] = w4;

					w += faceLen;
				}
			}
		}
	}

	return wtable->weight_table[faceLen].w;
}

static void free_ss_weights(WeightTable *wtable)
{
	int i;

	for (i = 0; i < wtable->len; i++) {
		if (wtable->weight_table[i].valid)
			MEM_freeN(wtable->weight_table[i].w);
	}
	
	if (wtable->weight_table)
		MEM_freeN(wtable->weight_table);
}

static void ss_sync_from_derivedmesh(CCGSubSurf *ss, DerivedMesh *dm,
                                     float (*vertexCos)[3], int useFlatSubdiv)
{
	float creaseFactor = (float) ccgSubSurf_getSubdivisionLevels(ss);
	CCGVertHDL *fVerts = NULL;
	BLI_array_declare(fVerts);
	MVert *mvert = dm->getVertArray(dm);
	MEdge *medge = dm->getEdgeArray(dm);
	/* MFace *mface = dm->getTessFaceArray(dm); */ /* UNUSED */
	MVert *mv;
	MEdge *me;
	MLoop *mloop = dm->getLoopArray(dm), *ml;
	MPoly *mpoly = dm->getPolyArray(dm), *mp;
	/*MFace *mf;*/ /*UNUSED*/
	int totvert = dm->getNumVerts(dm);
	int totedge = dm->getNumEdges(dm);
	/*int totface = dm->getNumTessFaces(dm);*/ /*UNUSED*/
	/*int totpoly = dm->getNumFaces(dm);*/ /*UNUSED*/
	int i, j;
	int *index;

	ccgSubSurf_initFullSync(ss);

	mv = mvert;
	index = (int *)dm->getVertDataArray(dm, CD_ORIGINDEX);
	for (i = 0; i < totvert; i++, mv++) {
		CCGVert *v;

		if (vertexCos) {
			ccgSubSurf_syncVert(ss, SET_INT_IN_POINTER(i), vertexCos[i], 0, &v);
		}
		else {
			ccgSubSurf_syncVert(ss, SET_INT_IN_POINTER(i), mv->co, 0, &v);
		}

		((int *)ccgSubSurf_getVertUserData(ss, v))[1] = (index) ? *index++ : i;
	}

	me = medge;
	index = (int *)dm->getEdgeDataArray(dm, CD_ORIGINDEX);
	for (i = 0; i < totedge; i++, me++) {
		CCGEdge *e;
		float crease;

		crease = useFlatSubdiv ? creaseFactor :
		         me->crease * creaseFactor / 255.0f;

		ccgSubSurf_syncEdge(ss, SET_INT_IN_POINTER(i), SET_INT_IN_POINTER(me->v1),
		                    SET_INT_IN_POINTER(me->v2), crease, &e);

		((int *)ccgSubSurf_getEdgeUserData(ss, e))[1] = (index) ? *index++ : i;
	}

	mp = mpoly;
	index = DM_get_poly_data_layer(dm, CD_ORIGINDEX);
	for (i = 0; i < dm->numPolyData; i++, mp++) {
		CCGFace *f;

		BLI_array_empty(fVerts);
		BLI_array_growitems(fVerts, mp->totloop);

		ml = mloop + mp->loopstart;
		for (j = 0; j < mp->totloop; j++, ml++) {
			fVerts[j] = SET_INT_IN_POINTER(ml->v);
		}

		/* this is very bad, means mesh is internally inconsistent.
		 * it is not really possible to continue without modifying
		 * other parts of code significantly to handle missing faces.
		 * since this really shouldn't even be possible we just bail.*/
		if (ccgSubSurf_syncFace(ss, SET_INT_IN_POINTER(i), mp->totloop,
		                        fVerts, &f) == eCCGError_InvalidValue) {
			static int hasGivenError = 0;

			if (!hasGivenError) {
				//XXX error("Unrecoverable error in SubSurf calculation,"
				//      " mesh is inconsistent.");

				hasGivenError = 1;
			}

			return;
		}

		((int *)ccgSubSurf_getFaceUserData(ss, f))[1] = (index) ? *index++ : i;
	}

	ccgSubSurf_processSync(ss);

	BLI_array_free(fVerts);
}

/***/

static int ccgDM_getVertMapIndex(CCGSubSurf *ss, CCGVert *v)
{
	return ((int *) ccgSubSurf_getVertUserData(ss, v))[1];
}

static int ccgDM_getEdgeMapIndex(CCGSubSurf *ss, CCGEdge *e)
{
	return ((int *) ccgSubSurf_getEdgeUserData(ss, e))[1];
}

static int ccgDM_getFaceMapIndex(CCGSubSurf *ss, CCGFace *f)
{
	return ((int *) ccgSubSurf_getFaceUserData(ss, f))[1];
}

static void ccgDM_getMinMax(DerivedMesh *dm, float min_r[3], float max_r[3])
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	CCGVertIterator *vi = ccgSubSurf_getVertIterator(ss);
	CCGEdgeIterator *ei = ccgSubSurf_getEdgeIterator(ss);
	CCGFaceIterator *fi = ccgSubSurf_getFaceIterator(ss);
	int i, edgeSize = ccgSubSurf_getEdgeSize(ss);
	int gridSize = ccgSubSurf_getGridSize(ss);

	if (!ccgSubSurf_getNumVerts(ss))
		min_r[0] = min_r[1] = min_r[2] = max_r[0] = max_r[1] = max_r[2] = 0.0;

	for (; !ccgVertIterator_isStopped(vi); ccgVertIterator_next(vi)) {
		CCGVert *v = ccgVertIterator_getCurrent(vi);
		float *co = ccgSubSurf_getVertData(ss, v);

		DO_MINMAX(co, min_r, max_r);
	}

	for (; !ccgEdgeIterator_isStopped(ei); ccgEdgeIterator_next(ei)) {
		CCGEdge *e = ccgEdgeIterator_getCurrent(ei);
		DMGridData *edgeData = ccgSubSurf_getEdgeDataArray(ss, e);

		for (i = 0; i < edgeSize; i++)
			DO_MINMAX(edgeData[i].co, min_r, max_r);
	}

	for (; !ccgFaceIterator_isStopped(fi); ccgFaceIterator_next(fi)) {
		CCGFace *f = ccgFaceIterator_getCurrent(fi);
		int S, x, y, numVerts = ccgSubSurf_getFaceNumVerts(f);

		for (S = 0; S < numVerts; S++) {
			DMGridData *faceGridData = ccgSubSurf_getFaceGridDataArray(ss, f, S);

			for (y = 0; y < gridSize; y++)
				for (x = 0; x < gridSize; x++)
					DO_MINMAX(faceGridData[y * gridSize + x].co, min_r, max_r);
		}
	}

	ccgFaceIterator_free(fi);
	ccgEdgeIterator_free(ei);
	ccgVertIterator_free(vi);
}

static int ccgDM_getNumVerts(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;

	return ccgSubSurf_getNumFinalVerts(ccgdm->ss);
}

static int ccgDM_getNumEdges(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;

	return ccgSubSurf_getNumFinalEdges(ccgdm->ss);
}

static int ccgDM_getNumTessFaces(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;

	return ccgSubSurf_getNumFinalFaces(ccgdm->ss);
}

static int ccgDM_getNumLoops(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;

	/* All subsurf faces are quads */
	return 4 * ccgSubSurf_getNumFinalFaces(ccgdm->ss);
}

static void ccgDM_getFinalVert(DerivedMesh *dm, int vertNum, MVert *mv)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	DMGridData *vd;
	int i;

	memset(mv, 0, sizeof(*mv));

	if ((vertNum < ccgdm->edgeMap[0].startVert) && (ccgSubSurf_getNumFaces(ss) > 0)) {
		/* this vert comes from face data */
		int lastface = ccgSubSurf_getNumFaces(ss) - 1;
		CCGFace *f;
		int x, y, grid, numVerts;
		int offset;
		int gridSize = ccgSubSurf_getGridSize(ss);
		int gridSideVerts;
		int gridInternalVerts;
		int gridSideEnd;
		int gridInternalEnd;

		i = 0;
		while (i < lastface && vertNum >= ccgdm->faceMap[i + 1].startVert)
			++i;

		f = ccgdm->faceMap[i].face;
		numVerts = ccgSubSurf_getFaceNumVerts(f);

		gridSideVerts = gridSize - 2;
		gridInternalVerts = gridSideVerts * gridSideVerts;

		gridSideEnd = 1 + numVerts * gridSideVerts;
		gridInternalEnd = gridSideEnd + numVerts * gridInternalVerts;

		offset = vertNum - ccgdm->faceMap[i].startVert;
		if (offset < 1) {
			vd = ccgSubSurf_getFaceCenterData(f);
			copy_v3_v3(mv->co, vd->co);
			normal_float_to_short_v3(mv->no, vd->no);
		}
		else if (offset < gridSideEnd) {
			offset -= 1;
			grid = offset / gridSideVerts;
			x = offset % gridSideVerts + 1;
			vd = ccgSubSurf_getFaceGridEdgeData(ss, f, grid, x);
			copy_v3_v3(mv->co, vd->co);
			normal_float_to_short_v3(mv->no, vd->no);
		}
		else if (offset < gridInternalEnd) {
			offset -= gridSideEnd;
			grid = offset / gridInternalVerts;
			offset %= gridInternalVerts;
			y = offset / gridSideVerts + 1;
			x = offset % gridSideVerts + 1;
			vd = ccgSubSurf_getFaceGridData(ss, f, grid, x, y);
			copy_v3_v3(mv->co, vd->co);
			normal_float_to_short_v3(mv->no, vd->no);
		}
	}
	else if ((vertNum < ccgdm->vertMap[0].startVert) && (ccgSubSurf_getNumEdges(ss) > 0)) {
		/* this vert comes from edge data */
		CCGEdge *e;
		int lastedge = ccgSubSurf_getNumEdges(ss) - 1;
		int x;

		i = 0;
		while (i < lastedge && vertNum >= ccgdm->edgeMap[i + 1].startVert)
			++i;

		e = ccgdm->edgeMap[i].edge;

		x = vertNum - ccgdm->edgeMap[i].startVert + 1;
		vd = ccgSubSurf_getEdgeData(ss, e, x);
		copy_v3_v3(mv->co, vd->co);
		normal_float_to_short_v3(mv->no, vd->no);
	}
	else {
		/* this vert comes from vert data */
		CCGVert *v;
		i = vertNum - ccgdm->vertMap[0].startVert;

		v = ccgdm->vertMap[i].vert;
		vd = ccgSubSurf_getVertData(ss, v);
		copy_v3_v3(mv->co, vd->co);
		normal_float_to_short_v3(mv->no, vd->no);
	}
}

static void ccgDM_getFinalVertCo(DerivedMesh *dm, int vertNum, float co_r[3])
{
	MVert mvert;

	ccgDM_getFinalVert(dm, vertNum, &mvert);
	copy_v3_v3(co_r, mvert.co);
}

static void ccgDM_getFinalVertNo(DerivedMesh *dm, int vertNum, float no_r[3])
{
	MVert mvert;

	ccgDM_getFinalVert(dm, vertNum, &mvert);
	normal_short_to_float_v3(no_r, mvert.no);
}

static void ccgDM_getFinalEdge(DerivedMesh *dm, int edgeNum, MEdge *med)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int i;

	memset(med, 0, sizeof(*med));

	if (edgeNum < ccgdm->edgeMap[0].startEdge) {
		/* this edge comes from face data */
		int lastface = ccgSubSurf_getNumFaces(ss) - 1;
		CCGFace *f;
		int x, y, grid /*, numVerts*/;
		int offset;
		int gridSize = ccgSubSurf_getGridSize(ss);
		int edgeSize = ccgSubSurf_getEdgeSize(ss);
		int gridSideEdges;
		int gridInternalEdges;

		/* code added in bmesh but works correctly without, commenting - campbell */
#if 0
		int lasti, previ;
		i = lastface;
		lasti = 0;
		while (1) {
			previ = i;
			if (ccgdm->faceMap[i].startEdge >= edgeNum) {
				i -= fabsf(i - lasti) / 2.0f;
			}
			else if (ccgdm->faceMap[i].startEdge < edgeNum) {
				i += fabsf(i - lasti) / 2.0f;
			}
			else {
				break;
			}

			if (i < 0) {
				i = 0;
				break;
			}

			if (i > lastface) {
				i = lastface;
				break;

			}

			if (i == lasti)
				break;

			lasti = previ;
		}

		i = i > 0 ? i - 1 : i;
#endif

		i = 0;
		while (i < lastface && edgeNum >= ccgdm->faceMap[i + 1].startEdge)
			++i;

		f = ccgdm->faceMap[i].face;
		/* numVerts = ccgSubSurf_getFaceNumVerts(f); */ /*UNUSED*/

		gridSideEdges = gridSize - 1;
		gridInternalEdges = (gridSideEdges - 1) * gridSideEdges * 2; 

		offset = edgeNum - ccgdm->faceMap[i].startEdge;
		grid = offset / (gridSideEdges + gridInternalEdges);
		offset %= (gridSideEdges + gridInternalEdges);

		if (offset < gridSideEdges) {
			x = offset;
			med->v1 = getFaceIndex(ss, f, grid, x, 0, edgeSize, gridSize);
			med->v2 = getFaceIndex(ss, f, grid, x + 1, 0, edgeSize, gridSize);
		}
		else {
			offset -= gridSideEdges;
			x = (offset / 2) / gridSideEdges + 1;
			y = (offset / 2) % gridSideEdges;
			if (offset % 2 == 0) {
				med->v1 = getFaceIndex(ss, f, grid, x, y, edgeSize, gridSize);
				med->v2 = getFaceIndex(ss, f, grid, x, y + 1, edgeSize, gridSize);
			}
			else {
				med->v1 = getFaceIndex(ss, f, grid, y, x, edgeSize, gridSize);
				med->v2 = getFaceIndex(ss, f, grid, y + 1, x, edgeSize, gridSize);
			}
		}
	}
	else {
		/* this vert comes from edge data */
		CCGEdge *e;
		int edgeSize = ccgSubSurf_getEdgeSize(ss);
		int x;
		short *edgeFlag;
		unsigned int flags = 0;

		i = (edgeNum - ccgdm->edgeMap[0].startEdge) / (edgeSize - 1);

		e = ccgdm->edgeMap[i].edge;

		if (!ccgSubSurf_getEdgeNumFaces(e)) flags |= ME_LOOSEEDGE;

		x = edgeNum - ccgdm->edgeMap[i].startEdge;

		med->v1 = getEdgeIndex(ss, e, x, edgeSize);
		med->v2 = getEdgeIndex(ss, e, x + 1, edgeSize);

		edgeFlag = (ccgdm->edgeFlags) ? &ccgdm->edgeFlags[i] : NULL;
		if (edgeFlag)
			flags |= (*edgeFlag & (ME_SEAM | ME_SHARP)) | ME_EDGEDRAW | ME_EDGERENDER;
		else
			flags |= ME_EDGEDRAW | ME_EDGERENDER;

		med->flag = flags;
	}
}

static void ccgDM_getFinalFace(DerivedMesh *dm, int faceNum, MFace *mf)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int gridSize = ccgSubSurf_getGridSize(ss);
	int edgeSize = ccgSubSurf_getEdgeSize(ss);
	int gridSideEdges = gridSize - 1;
	int gridFaces = gridSideEdges * gridSideEdges;
	int i;
	CCGFace *f;
	/*int numVerts;*/
	int offset;
	int grid;
	int x, y;
	/*int lastface = ccgSubSurf_getNumFaces(ss) - 1;*/ /*UNUSED*/
	DMFlagMat *faceFlags = ccgdm->faceFlags;

	memset(mf, 0, sizeof(*mf));
	if (faceNum >= ccgdm->dm.numTessFaceData)
		return;

	i = ccgdm->reverseFaceMap[faceNum];

	f = ccgdm->faceMap[i].face;
	/*numVerts = ccgSubSurf_getFaceNumVerts(f);*/ /*UNUSED*/

	offset = faceNum - ccgdm->faceMap[i].startFace;
	grid = offset / gridFaces;
	offset %= gridFaces;
	y = offset / gridSideEdges;
	x = offset % gridSideEdges;

	mf->v1 = getFaceIndex(ss, f, grid, x + 0, y + 0, edgeSize, gridSize);
	mf->v2 = getFaceIndex(ss, f, grid, x + 0, y + 1, edgeSize, gridSize);
	mf->v3 = getFaceIndex(ss, f, grid, x + 1, y + 1, edgeSize, gridSize);
	mf->v4 = getFaceIndex(ss, f, grid, x + 1, y + 0, edgeSize, gridSize);

	if (faceFlags) {
		mf->flag = faceFlags[i].flag;
		mf->mat_nr = faceFlags[i].mat_nr;
	}
	else mf->flag = ME_SMOOTH;
}

/* Translate GridHidden into the ME_HIDE flag for MVerts. Assumes
 * vertices are in the order output by ccgDM_copyFinalVertArray. */
void subsurf_copy_grid_hidden(DerivedMesh *dm, const MPoly *mpoly,
                              MVert *mvert, const MDisps *mdisps)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;
	CCGSubSurf *ss = ccgdm->ss;
	int level = ccgSubSurf_getSubdivisionLevels(ss);
	int gridSize = ccgSubSurf_getGridSize(ss);
	int edgeSize = ccgSubSurf_getEdgeSize(ss);
	int totface = ccgSubSurf_getNumFaces(ss);
	int i, j, x, y;
	
	for (i = 0; i < totface; i++) {
		CCGFace *f = ccgdm->faceMap[i].face;

		for (j = 0; j < mpoly[i].totloop; j++) {
			const MDisps *md = &mdisps[mpoly[i].loopstart + j];
			int hidden_gridsize = ccg_gridsize(md->level);
			int factor = ccg_factor(level, md->level);
			
			if (!md->hidden)
				continue;
			
			for (y = 0; y < gridSize; y++) {
				for (x = 0; x < gridSize; x++) {
					int vndx, offset;
					
					vndx = getFaceIndex(ss, f, j, x, y, edgeSize, gridSize);
					offset = (y * factor) * hidden_gridsize + (x * factor);
					if (BLI_BITMAP_GET(md->hidden, offset))
						mvert[vndx].flag |= ME_HIDE;
				}
			}
		}
	}
}

static void ccgDM_copyFinalVertArray(DerivedMesh *dm, MVert *mvert)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	DMGridData *vd;
	int index;
	int totvert, totedge, totface;
	int gridSize = ccgSubSurf_getGridSize(ss);
	int edgeSize = ccgSubSurf_getEdgeSize(ss);
	int i = 0;

	totface = ccgSubSurf_getNumFaces(ss);
	for (index = 0; index < totface; index++) {
		CCGFace *f = ccgdm->faceMap[index].face;
		int x, y, S, numVerts = ccgSubSurf_getFaceNumVerts(f);

		vd = ccgSubSurf_getFaceCenterData(f);
		copy_v3_v3(mvert[i].co, vd->co);
		normal_float_to_short_v3(mvert[i].no, vd->no);
		i++;
		
		for (S = 0; S < numVerts; S++) {
			for (x = 1; x < gridSize - 1; x++, i++) {
				vd = ccgSubSurf_getFaceGridEdgeData(ss, f, S, x);
				copy_v3_v3(mvert[i].co, vd->co);
				normal_float_to_short_v3(mvert[i].no, vd->no);
			}
		}

		for (S = 0; S < numVerts; S++) {
			for (y = 1; y < gridSize - 1; y++) {
				for (x = 1; x < gridSize - 1; x++, i++) {
					vd = ccgSubSurf_getFaceGridData(ss, f, S, x, y);
					copy_v3_v3(mvert[i].co, vd->co);
					normal_float_to_short_v3(mvert[i].no, vd->no);
				}
			}
		}
	}

	totedge = ccgSubSurf_getNumEdges(ss);
	for (index = 0; index < totedge; index++) {
		CCGEdge *e = ccgdm->edgeMap[index].edge;
		int x;

		for (x = 1; x < edgeSize - 1; x++, i++) {
			vd = ccgSubSurf_getEdgeData(ss, e, x);
			copy_v3_v3(mvert[i].co, vd->co);
			/* This gives errors with -debug-fpe
			 * the normals don't seem to be unit length.
			 * this is most likely caused by edges with no
			 * faces which are now zerod out, see comment in:
			 * ccgSubSurf__calcVertNormals(), - campbell */
			normal_float_to_short_v3(mvert[i].no, vd->no);
		}
	}

	totvert = ccgSubSurf_getNumVerts(ss);
	for (index = 0; index < totvert; index++) {
		CCGVert *v = ccgdm->vertMap[index].vert;

		vd = ccgSubSurf_getVertData(ss, v);
		copy_v3_v3(mvert[i].co, vd->co);
		normal_float_to_short_v3(mvert[i].no, vd->no);
		i++;
	}
}

static void ccgDM_copyFinalEdgeArray(DerivedMesh *dm, MEdge *medge)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int index;
	int totedge, totface;
	int gridSize = ccgSubSurf_getGridSize(ss);
	int edgeSize = ccgSubSurf_getEdgeSize(ss);
	int i = 0;
	short *edgeFlags = ccgdm->edgeFlags;

	totface = ccgSubSurf_getNumFaces(ss);
	for (index = 0; index < totface; index++) {
		CCGFace *f = ccgdm->faceMap[index].face;
		int x, y, S, numVerts = ccgSubSurf_getFaceNumVerts(f);

		for (S = 0; S < numVerts; S++) {
			for (x = 0; x < gridSize - 1; x++) {
				MEdge *med = &medge[i];

				if (ccgdm->drawInteriorEdges)
					med->flag = ME_EDGEDRAW | ME_EDGERENDER;
				med->v1 = getFaceIndex(ss, f, S, x, 0, edgeSize, gridSize);
				med->v2 = getFaceIndex(ss, f, S, x + 1, 0, edgeSize, gridSize);
				i++;
			}

			for (x = 1; x < gridSize - 1; x++) {
				for (y = 0; y < gridSize - 1; y++) {
					MEdge *med;

					med = &medge[i];
					if (ccgdm->drawInteriorEdges)
						med->flag = ME_EDGEDRAW | ME_EDGERENDER;
					med->v1 = getFaceIndex(ss, f, S, x, y,
					                       edgeSize, gridSize);
					med->v2 = getFaceIndex(ss, f, S, x, y + 1,
					                       edgeSize, gridSize);
					i++;

					med = &medge[i];
					if (ccgdm->drawInteriorEdges)
						med->flag = ME_EDGEDRAW | ME_EDGERENDER;
					med->v1 = getFaceIndex(ss, f, S, y, x,
					                       edgeSize, gridSize);
					med->v2 = getFaceIndex(ss, f, S, y + 1, x,
					                       edgeSize, gridSize);
					i++;
				}
			}
		}
	}

	totedge = ccgSubSurf_getNumEdges(ss);
	for (index = 0; index < totedge; index++) {
		CCGEdge *e = ccgdm->edgeMap[index].edge;
		unsigned int flags = 0;
		int x;
		int edgeIdx = GET_INT_FROM_POINTER(ccgSubSurf_getEdgeEdgeHandle(e));

		if (!ccgSubSurf_getEdgeNumFaces(e)) flags |= ME_LOOSEEDGE;

		if (edgeFlags) {
			if (edgeIdx != -1) {
				flags |= (edgeFlags[index] & (ME_SEAM | ME_SHARP))
				         | ME_EDGEDRAW | ME_EDGERENDER;
			}
		}
		else {
			flags |= ME_EDGEDRAW | ME_EDGERENDER;
		}

		for (x = 0; x < edgeSize - 1; x++) {
			MEdge *med = &medge[i];
			med->v1 = getEdgeIndex(ss, e, x, edgeSize);
			med->v2 = getEdgeIndex(ss, e, x + 1, edgeSize);
			med->flag = flags;
			i++;
		}
	}
}

static void ccgDM_copyFinalFaceArray(DerivedMesh *dm, MFace *mface)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int index;
	int totface;
	int gridSize = ccgSubSurf_getGridSize(ss);
	int edgeSize = ccgSubSurf_getEdgeSize(ss);
	int i = 0;
	DMFlagMat *faceFlags = ccgdm->faceFlags;

	totface = ccgSubSurf_getNumFaces(ss);
	for (index = 0; index < totface; index++) {
		CCGFace *f = ccgdm->faceMap[index].face;
		int x, y, S, numVerts = ccgSubSurf_getFaceNumVerts(f);
		/* keep types in sync with MFace, avoid many conversions */
		char flag = (faceFlags) ? faceFlags[index].flag : ME_SMOOTH;
		short mat_nr = (faceFlags) ? faceFlags[index].mat_nr : 0;

		for (S = 0; S < numVerts; S++) {
			for (y = 0; y < gridSize - 1; y++) {
				for (x = 0; x < gridSize - 1; x++) {
					MFace *mf = &mface[i];
					mf->v1 = getFaceIndex(ss, f, S, x + 0, y + 0,
					                      edgeSize, gridSize);
					mf->v2 = getFaceIndex(ss, f, S, x + 0, y + 1,
					                      edgeSize, gridSize);
					mf->v3 = getFaceIndex(ss, f, S, x + 1, y + 1,
					                      edgeSize, gridSize);
					mf->v4 = getFaceIndex(ss, f, S, x + 1, y + 0,
					                      edgeSize, gridSize);
					mf->mat_nr = mat_nr;
					mf->flag = flag;

					i++;
				}
			}
		}
	}
}

static void ccgDM_copyFinalLoopArray(DerivedMesh *dm, MLoop *mloop)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int index;
	int totface;
	int gridSize = ccgSubSurf_getGridSize(ss);
	int edgeSize = ccgSubSurf_getEdgeSize(ss);
	int i = 0;
	MLoop *mv;
	/* DMFlagMat *faceFlags = ccgdm->faceFlags; */ /* UNUSED */

	if (!ccgdm->ehash) {
		MEdge *medge;

		ccgdm->ehash = BLI_edgehash_new();
		medge = ccgdm->dm.getEdgeArray((DerivedMesh *)ccgdm);

		for (i = 0; i < ccgdm->dm.numEdgeData; i++) {
			BLI_edgehash_insert(ccgdm->ehash, medge[i].v1, medge[i].v2, SET_INT_IN_POINTER(i));
		}
	}

	totface = ccgSubSurf_getNumFaces(ss);
	mv = mloop;
	for (index = 0; index < totface; index++) {
		CCGFace *f = ccgdm->faceMap[index].face;
		int x, y, S, numVerts = ccgSubSurf_getFaceNumVerts(f);
		/* int flag = (faceFlags)? faceFlags[index*2]: ME_SMOOTH; */ /* UNUSED */
		/* int mat_nr = (faceFlags)? faceFlags[index*2+1]: 0; */ /* UNUSED */

		for (S = 0; S < numVerts; S++) {
			for (y = 0; y < gridSize - 1; y++) {
				for (x = 0; x < gridSize - 1; x++) {
					int v1, v2, v3, v4;

					v1 = getFaceIndex(ss, f, S, x + 0, y + 0,
					                  edgeSize, gridSize);

					v2 = getFaceIndex(ss, f, S, x + 0, y + 1,
					                  edgeSize, gridSize);
					v3 = getFaceIndex(ss, f, S, x + 1, y + 1,
					                  edgeSize, gridSize);
					v4 = getFaceIndex(ss, f, S, x + 1, y + 0,
					                  edgeSize, gridSize);

					mv->v = v1;
					mv->e = GET_INT_FROM_POINTER(BLI_edgehash_lookup(ccgdm->ehash, v1, v2));
					mv++, i++;

					mv->v = v2;
					mv->e = GET_INT_FROM_POINTER(BLI_edgehash_lookup(ccgdm->ehash, v2, v3));
					mv++, i++;

					mv->v = v3;
					mv->e = GET_INT_FROM_POINTER(BLI_edgehash_lookup(ccgdm->ehash, v3, v4));
					mv++, i++;

					mv->v = v4;
					mv->e = GET_INT_FROM_POINTER(BLI_edgehash_lookup(ccgdm->ehash, v4, v1));
					mv++, i++;
				}
			}
		}
	}
}

static void ccgDM_copyFinalPolyArray(DerivedMesh *dm, MPoly *mpoly)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int index;
	int totface;
	int gridSize = ccgSubSurf_getGridSize(ss);
	/* int edgeSize = ccgSubSurf_getEdgeSize(ss); */ /* UNUSED */
	int i = 0, k = 0;
	DMFlagMat *faceFlags = ccgdm->faceFlags;

	totface = ccgSubSurf_getNumFaces(ss);
	for (index = 0; index < totface; index++) {
		CCGFace *f = ccgdm->faceMap[index].face;
		int x, y, S, numVerts = ccgSubSurf_getFaceNumVerts(f);
		int flag = (faceFlags) ? faceFlags[index].flag : ME_SMOOTH;
		int mat_nr = (faceFlags) ? faceFlags[index].mat_nr : 0;

		for (S = 0; S < numVerts; S++) {
			for (y = 0; y < gridSize - 1; y++) {
				for (x = 0; x < gridSize - 1; x++) {
					MPoly *mp = &mpoly[i];

					mp->mat_nr = mat_nr;
					mp->flag = flag;
					mp->loopstart = k;
					mp->totloop = 4;

					k += 4;
					i++;
				}
			}
		}
	}
}

static void ccgdm_getVertCos(DerivedMesh *dm, float (*cos)[3])
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int edgeSize = ccgSubSurf_getEdgeSize(ss);
	int gridSize = ccgSubSurf_getGridSize(ss);
	int i;
	CCGVertIterator *vi;
	CCGEdgeIterator *ei;
	CCGFaceIterator *fi;
	CCGFace **faceMap2;
	CCGEdge **edgeMap2;
	CCGVert **vertMap2;
	int index, totvert, totedge, totface;
	
	totvert = ccgSubSurf_getNumVerts(ss);
	vertMap2 = MEM_mallocN(totvert * sizeof(*vertMap2), "vertmap");
	vi = ccgSubSurf_getVertIterator(ss);
	for (; !ccgVertIterator_isStopped(vi); ccgVertIterator_next(vi)) {
		CCGVert *v = ccgVertIterator_getCurrent(vi);

		vertMap2[GET_INT_FROM_POINTER(ccgSubSurf_getVertVertHandle(v))] = v;
	}
	ccgVertIterator_free(vi);

	totedge = ccgSubSurf_getNumEdges(ss);
	edgeMap2 = MEM_mallocN(totedge * sizeof(*edgeMap2), "edgemap");
	ei = ccgSubSurf_getEdgeIterator(ss);
	for (i = 0; !ccgEdgeIterator_isStopped(ei); i++, ccgEdgeIterator_next(ei)) {
		CCGEdge *e = ccgEdgeIterator_getCurrent(ei);

		edgeMap2[GET_INT_FROM_POINTER(ccgSubSurf_getEdgeEdgeHandle(e))] = e;
	}

	totface = ccgSubSurf_getNumFaces(ss);
	faceMap2 = MEM_mallocN(totface * sizeof(*faceMap2), "facemap");
	fi = ccgSubSurf_getFaceIterator(ss);
	for (; !ccgFaceIterator_isStopped(fi); ccgFaceIterator_next(fi)) {
		CCGFace *f = ccgFaceIterator_getCurrent(fi);

		faceMap2[GET_INT_FROM_POINTER(ccgSubSurf_getFaceFaceHandle(f))] = f;
	}
	ccgFaceIterator_free(fi);

	i = 0;
	for (index = 0; index < totface; index++) {
		CCGFace *f = faceMap2[index];
		int x, y, S, numVerts = ccgSubSurf_getFaceNumVerts(f);

		copy_v3_v3(cos[i++], ccgSubSurf_getFaceCenterData(f));
		
		for (S = 0; S < numVerts; S++) {
			for (x = 1; x < gridSize - 1; x++) {
				copy_v3_v3(cos[i++], ccgSubSurf_getFaceGridEdgeData(ss, f, S, x));
			}
		}

		for (S = 0; S < numVerts; S++) {
			for (y = 1; y < gridSize - 1; y++) {
				for (x = 1; x < gridSize - 1; x++) {
					copy_v3_v3(cos[i++], ccgSubSurf_getFaceGridData(ss, f, S, x, y));
				}
			}
		}
	}

	for (index = 0; index < totedge; index++) {
		CCGEdge *e = edgeMap2[index];
		int x;

		for (x = 1; x < edgeSize - 1; x++) {
			copy_v3_v3(cos[i++], ccgSubSurf_getEdgeData(ss, e, x));
		}
	}

	for (index = 0; index < totvert; index++) {
		CCGVert *v = vertMap2[index];
		copy_v3_v3(cos[i++], ccgSubSurf_getVertData(ss, v));
	}

	MEM_freeN(vertMap2);
	MEM_freeN(edgeMap2);
	MEM_freeN(faceMap2);
}

static void ccgDM_foreachMappedVert(
    DerivedMesh *dm,
    void (*func)(void *userData, int index, const float co[3], const float no_f[3], const short no_s[3]),
    void *userData)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGVertIterator *vi = ccgSubSurf_getVertIterator(ccgdm->ss);

	for (; !ccgVertIterator_isStopped(vi); ccgVertIterator_next(vi)) {
		CCGVert *v = ccgVertIterator_getCurrent(vi);
		DMGridData *vd = ccgSubSurf_getVertData(ccgdm->ss, v);
		int index = ccgDM_getVertMapIndex(ccgdm->ss, v);

		if (index != -1)
			func(userData, index, vd->co, vd->no, NULL);
	}

	ccgVertIterator_free(vi);
}

static void ccgDM_foreachMappedEdge(
    DerivedMesh *dm,
    void (*func)(void *userData, int index, const float v0co[3], const float v1co[3]),
    void *userData)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	CCGEdgeIterator *ei = ccgSubSurf_getEdgeIterator(ss);
	int i, edgeSize = ccgSubSurf_getEdgeSize(ss);

	for (; !ccgEdgeIterator_isStopped(ei); ccgEdgeIterator_next(ei)) {
		CCGEdge *e = ccgEdgeIterator_getCurrent(ei);
		DMGridData *edgeData = ccgSubSurf_getEdgeDataArray(ss, e);
		int index = ccgDM_getEdgeMapIndex(ss, e);

		if (index != -1) {
			for (i = 0; i < edgeSize - 1; i++)
				func(userData, index, edgeData[i].co, edgeData[i + 1].co);
		}
	}

	ccgEdgeIterator_free(ei);
}

static void ccgDM_drawVerts(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int edgeSize = ccgSubSurf_getEdgeSize(ss);
	int gridSize = ccgSubSurf_getGridSize(ss);
	CCGVertIterator *vi;
	CCGEdgeIterator *ei;
	CCGFaceIterator *fi;

	glBegin(GL_POINTS);
	vi = ccgSubSurf_getVertIterator(ss);
	for (; !ccgVertIterator_isStopped(vi); ccgVertIterator_next(vi)) {
		CCGVert *v = ccgVertIterator_getCurrent(vi);
		glVertex3fv(ccgSubSurf_getVertData(ss, v));
	}
	ccgVertIterator_free(vi);

	ei = ccgSubSurf_getEdgeIterator(ss);
	for (; !ccgEdgeIterator_isStopped(ei); ccgEdgeIterator_next(ei)) {
		CCGEdge *e = ccgEdgeIterator_getCurrent(ei);
		int x;

		for (x = 1; x < edgeSize - 1; x++)
			glVertex3fv(ccgSubSurf_getEdgeData(ss, e, x));
	}
	ccgEdgeIterator_free(ei);

	fi = ccgSubSurf_getFaceIterator(ss);
	for (; !ccgFaceIterator_isStopped(fi); ccgFaceIterator_next(fi)) {
		CCGFace *f = ccgFaceIterator_getCurrent(fi);
		int x, y, S, numVerts = ccgSubSurf_getFaceNumVerts(f);

		glVertex3fv(ccgSubSurf_getFaceCenterData(f));
		for (S = 0; S < numVerts; S++)
			for (x = 1; x < gridSize - 1; x++)
				glVertex3fv(ccgSubSurf_getFaceGridEdgeData(ss, f, S, x));
		for (S = 0; S < numVerts; S++)
			for (y = 1; y < gridSize - 1; y++)
				for (x = 1; x < gridSize - 1; x++)
					glVertex3fv(ccgSubSurf_getFaceGridData(ss, f, S, x, y));
	}
	ccgFaceIterator_free(fi);
	glEnd();
}

static void ccgdm_pbvh_update(CCGDerivedMesh *ccgdm)
{
	if (ccgdm->pbvh && ccgDM_use_grid_pbvh(ccgdm)) {
		CCGFace **faces;
		int totface;

		BLI_pbvh_get_grid_updates(ccgdm->pbvh, 1, (void ***)&faces, &totface);
		if (totface) {
			ccgSubSurf_updateFromFaces(ccgdm->ss, 0, faces, totface);
			ccgSubSurf_updateNormals(ccgdm->ss, faces, totface);
			MEM_freeN(faces);
		}
	}
}

static void ccgDM_drawEdges(DerivedMesh *dm, int drawLooseEdges, int drawAllEdges)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int i, j, edgeSize = ccgSubSurf_getEdgeSize(ss);
	int totedge = ccgSubSurf_getNumEdges(ss);
	int gridSize = ccgSubSurf_getGridSize(ss);
	int useAging;

	ccgdm_pbvh_update(ccgdm);

	ccgSubSurf_getUseAgeCounts(ss, &useAging, NULL, NULL, NULL);

	for (j = 0; j < totedge; j++) {
		CCGEdge *e = ccgdm->edgeMap[j].edge;
		DMGridData *edgeData = ccgSubSurf_getEdgeDataArray(ss, e);

		if (!drawLooseEdges && !ccgSubSurf_getEdgeNumFaces(e))
			continue;

		if (!drawAllEdges && ccgdm->edgeFlags && !(ccgdm->edgeFlags[j] & ME_EDGEDRAW))
			continue;

		if (useAging && !(G.f & G_BACKBUFSEL)) {
			int ageCol = 255 - ccgSubSurf_getEdgeAge(ss, e) * 4;
			glColor3ub(0, ageCol > 0 ? ageCol : 0, 0);
		}

		glBegin(GL_LINE_STRIP);
		for (i = 0; i < edgeSize - 1; i++) {
			glVertex3fv(edgeData[i].co);
			glVertex3fv(edgeData[i + 1].co);
		}
		glEnd();
	}

	if (useAging && !(G.f & G_BACKBUFSEL)) {
		glColor3ub(0, 0, 0);
	}

	if (ccgdm->drawInteriorEdges) {
		int totface = ccgSubSurf_getNumFaces(ss);

		for (j = 0; j < totface; j++) {
			CCGFace *f = ccgdm->faceMap[j].face;
			int S, x, y, numVerts = ccgSubSurf_getFaceNumVerts(f);

			for (S = 0; S < numVerts; S++) {
				DMGridData *faceGridData = ccgSubSurf_getFaceGridDataArray(ss, f, S);

				glBegin(GL_LINE_STRIP);
				for (x = 0; x < gridSize; x++)
					glVertex3fv(faceGridData[x].co);
				glEnd();
				for (y = 1; y < gridSize - 1; y++) {
					glBegin(GL_LINE_STRIP);
					for (x = 0; x < gridSize; x++)
						glVertex3fv(faceGridData[y * gridSize + x].co);
					glEnd();
				}
				for (x = 1; x < gridSize - 1; x++) {
					glBegin(GL_LINE_STRIP);
					for (y = 0; y < gridSize; y++)
						glVertex3fv(faceGridData[y * gridSize + x].co);
					glEnd();
				}
			}
		}
	}
}

static void ccgDM_drawLooseEdges(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int totedge = ccgSubSurf_getNumEdges(ss);
	int i, j, edgeSize = ccgSubSurf_getEdgeSize(ss);

	for (j = 0; j < totedge; j++) {
		CCGEdge *e = ccgdm->edgeMap[j].edge;
		DMGridData *edgeData = ccgSubSurf_getEdgeDataArray(ss, e);

		if (!ccgSubSurf_getEdgeNumFaces(e)) {
			glBegin(GL_LINE_STRIP);
			for (i = 0; i < edgeSize - 1; i++) {
				glVertex3fv(edgeData[i].co);
				glVertex3fv(edgeData[i + 1].co);
			}
			glEnd();
		}
	}
}

static void ccgDM_glNormalFast(float *a, float *b, float *c, float *d)
{
	float a_cX = c[0] - a[0], a_cY = c[1] - a[1], a_cZ = c[2] - a[2];
	float b_dX = d[0] - b[0], b_dY = d[1] - b[1], b_dZ = d[2] - b[2];
	float no[3];

	no[0] = b_dY * a_cZ - b_dZ * a_cY;
	no[1] = b_dZ * a_cX - b_dX * a_cZ;
	no[2] = b_dX * a_cY - b_dY * a_cX;

	/* don't normalize, GL_NORMALIZE is enabled */
	glNormal3fv(no);
}

/* Only used by non-editmesh types */
static void ccgDM_drawFacesSolid(DerivedMesh *dm, float (*partial_redraw_planes)[4], int fast, DMSetMaterial setMaterial)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	int gridSize = ccgSubSurf_getGridSize(ss);
	DMFlagMat *faceFlags = ccgdm->faceFlags;
	int step = (fast) ? gridSize - 1 : 1;
	int i, totface = ccgSubSurf_getNumFaces(ss);
	int drawcurrent = 0, matnr = -1, shademodel = -1;

	ccgdm_pbvh_update(ccgdm);

	if (ccgdm->pbvh && ccgdm->multires.mmd && !fast) {
		if (dm->numTessFaceData) {
			BLI_pbvh_draw(ccgdm->pbvh, partial_redraw_planes, NULL, setMaterial);
			glShadeModel(GL_FLAT);
		}

		return;
	}

	for (i = 0; i < totface; i++) {
		CCGFace *f = ccgdm->faceMap[i].face;
		int S, x, y, numVerts = ccgSubSurf_getFaceNumVerts(f);
		int index = GET_INT_FROM_POINTER(ccgSubSurf_getFaceFaceHandle(f));
		int new_matnr, new_shademodel;

		if (faceFlags) {
			new_shademodel = (faceFlags[index].flag & ME_SMOOTH) ? GL_SMOOTH : GL_FLAT;
			new_matnr = faceFlags[index].mat_nr;
		}
		else {
			new_shademodel = GL_SMOOTH;
			new_matnr = 0;
		}
		
		if (shademodel != new_shademodel || matnr != new_matnr) {
			matnr = new_matnr;
			shademodel = new_shademodel;

			drawcurrent = setMaterial(matnr + 1, NULL);

			glShadeModel(shademodel);
		}

		if (!drawcurrent)
			continue;

		for (S = 0; S < numVerts; S++) {
			DMGridData *faceGridData = ccgSubSurf_getFaceGridDataArray(ss, f, S);

			if (shademodel == GL_SMOOTH) {
				for (y = 0; y < gridSize - 1; y += step) {
					glBegin(GL_QUAD_STRIP);
					for (x = 0; x < gridSize; x += step) {
						DMGridData *a = &faceGridData[(y + 0) * gridSize + x];
						DMGridData *b = &faceGridData[(y + step) * gridSize + x];

						glNormal3fv(a->no);
						glVertex3fv(a->co);
						glNormal3fv(b->no);
						glVertex3fv(b->co);
					}
					glEnd();
				}
			}
			else {
				glBegin(GL_QUADS);
				for (y = 0; y < gridSize - 1; y += step) {
					for (x = 0; x < gridSize - 1; x += step) {
						float *a = faceGridData[(y + 0) * gridSize + x].co;
						float *b = faceGridData[(y + 0) * gridSize + x + step].co;
						float *c = faceGridData[(y + step) * gridSize + x + step].co;
						float *d = faceGridData[(y + step) * gridSize + x].co;

						ccgDM_glNormalFast(a, b, c, d);

						glVertex3fv(d);
						glVertex3fv(c);
						glVertex3fv(b);
						glVertex3fv(a);
					}
				}
				glEnd();
			}
		}
	}
}

/* Only used by non-editmesh types */
static void ccgDM_drawMappedFacesGLSL(DerivedMesh *dm,
                                      DMSetMaterial setMaterial,
                                      DMSetDrawOptions setDrawOptions,
                                      void *userData)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	GPUVertexAttribs gattribs;
	DMVertexAttribs attribs = {{{NULL}}};
	/* MTFace *tf = dm->getTessFaceDataArray(dm, CD_MTFACE); */ /* UNUSED */
	int gridSize = ccgSubSurf_getGridSize(ss);
	int gridFaces = gridSize - 1;
	int edgeSize = ccgSubSurf_getEdgeSize(ss);
	DMFlagMat *faceFlags = ccgdm->faceFlags;
	int a, b, i, doDraw, numVerts, matnr, new_matnr, totface;

	ccgdm_pbvh_update(ccgdm);

	doDraw = 0;
	matnr = -1;

#define PASSATTRIB(dx, dy, vert) {                                              \
	if (attribs.totorco) {                                                      \
		index = getFaceIndex(ss, f, S, x + dx, y + dy, edgeSize, gridSize);     \
		glVertexAttrib3fvARB(attribs.orco.glIndex, attribs.orco.array[index]);  \
	}                                                                           \
	for (b = 0; b < attribs.tottface; b++) {                                    \
		MTFace *tf = &attribs.tface[b].array[a];                                \
		glVertexAttrib2fvARB(attribs.tface[b].glIndex, tf->uv[vert]);           \
	}                                                                           \
	for (b = 0; b < attribs.totmcol; b++) {                                     \
		MCol *cp = &attribs.mcol[b].array[a * 4 + vert];                        \
		GLubyte col[4];                                                         \
		col[0] = cp->b; col[1] = cp->g; col[2] = cp->r; col[3] = cp->a;         \
		glVertexAttrib4ubvARB(attribs.mcol[b].glIndex, col);                    \
	}                                                                           \
	if (attribs.tottang) {                                                      \
		float *tang = attribs.tang.array[a * 4 + vert];                         \
		glVertexAttrib4fvARB(attribs.tang.glIndex, tang);                       \
	}                                                                           \
}

	totface = ccgSubSurf_getNumFaces(ss);
	for (a = 0, i = 0; i < totface; i++) {
		CCGFace *f = ccgdm->faceMap[i].face;
		int S, x, y, drawSmooth;
		int index = GET_INT_FROM_POINTER(ccgSubSurf_getFaceFaceHandle(f));
		int origIndex = ccgDM_getFaceMapIndex(ss, f);
		
		numVerts = ccgSubSurf_getFaceNumVerts(f);

		if (faceFlags) {
			drawSmooth = (faceFlags[index].flag & ME_SMOOTH);
			new_matnr = faceFlags[index].mat_nr + 1;
		}
		else {
			drawSmooth = 1;
			new_matnr = 1;
		}

		if (new_matnr != matnr) {
			doDraw = setMaterial(matnr = new_matnr, &gattribs);
			if (doDraw)
				DM_vertex_attributes_from_gpu(dm, &gattribs, &attribs);
		}

		if (!doDraw || (setDrawOptions && (origIndex != ORIGINDEX_NONE) &&
		                (setDrawOptions(userData, origIndex) == DM_DRAW_OPTION_SKIP)))
		{
			a += gridFaces * gridFaces * numVerts;
			continue;
		}

		glShadeModel(drawSmooth ? GL_SMOOTH : GL_FLAT);
		for (S = 0; S < numVerts; S++) {
			DMGridData *faceGridData = ccgSubSurf_getFaceGridDataArray(ss, f, S);
			DMGridData *vda, *vdb;

			if (drawSmooth) {
				for (y = 0; y < gridFaces; y++) {
					glBegin(GL_QUAD_STRIP);
					for (x = 0; x < gridFaces; x++) {
						vda = &faceGridData[(y + 0) * gridSize + x];
						vdb = &faceGridData[(y + 1) * gridSize + x];
						
						PASSATTRIB(0, 0, 0);
						glNormal3fv(vda->no);
						glVertex3fv(vda->co);

						PASSATTRIB(0, 1, 1);
						glNormal3fv(vdb->no);
						glVertex3fv(vdb->co);

						if (x != gridFaces - 1)
							a++;
					}

					vda = &faceGridData[(y + 0) * gridSize + x];
					vdb = &faceGridData[(y + 1) * gridSize + x];

					PASSATTRIB(0, 0, 3);
					glNormal3fv(vda->no);
					glVertex3fv(vda->co);

					PASSATTRIB(0, 1, 2);
					glNormal3fv(vdb->no);
					glVertex3fv(vdb->co);

					glEnd();

					a++;
				}
			}
			else {
				glBegin(GL_QUADS);
				for (y = 0; y < gridFaces; y++) {
					for (x = 0; x < gridFaces; x++) {
						float *aco = faceGridData[(y + 0) * gridSize + x].co;
						float *bco = faceGridData[(y + 0) * gridSize + x + 1].co;
						float *cco = faceGridData[(y + 1) * gridSize + x + 1].co;
						float *dco = faceGridData[(y + 1) * gridSize + x].co;

						ccgDM_glNormalFast(aco, bco, cco, dco);

						PASSATTRIB(0, 1, 1);
						glVertex3fv(dco);
						PASSATTRIB(1, 1, 2);
						glVertex3fv(cco);
						PASSATTRIB(1, 0, 3);
						glVertex3fv(bco);
						PASSATTRIB(0, 0, 0);
						glVertex3fv(aco);
						
						a++;
					}
				}
				glEnd();
			}
		}
	}

#undef PASSATTRIB
}

static void ccgDM_drawFacesGLSL(DerivedMesh *dm, DMSetMaterial setMaterial)
{
	dm->drawMappedFacesGLSL(dm, setMaterial, NULL, NULL);
}

/* Only used by non-editmesh types */
static void ccgDM_drawMappedFacesMat(DerivedMesh *dm, void (*setMaterial)(void *userData, int, void *attribs), int (*setFace)(void *userData, int index), void *userData)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	GPUVertexAttribs gattribs;
	DMVertexAttribs attribs = {{{NULL}}};
	int gridSize = ccgSubSurf_getGridSize(ss);
	int gridFaces = gridSize - 1;
	int edgeSize = ccgSubSurf_getEdgeSize(ss);
	DMFlagMat *faceFlags = ccgdm->faceFlags;
	int a, b, i, numVerts, matnr, new_matnr, totface;

	ccgdm_pbvh_update(ccgdm);

	matnr = -1;

#define PASSATTRIB(dx, dy, vert) {                                              \
	if (attribs.totorco) {                                                      \
		index = getFaceIndex(ss, f, S, x + dx, y + dy, edgeSize, gridSize);     \
		if (attribs.orco.glTexco)                                               \
			glTexCoord3fv(attribs.orco.array[index]);                           \
		else                                                                    \
			glVertexAttrib3fvARB(attribs.orco.glIndex, attribs.orco.array[index]);  \
	}                                                                           \
	for (b = 0; b < attribs.tottface; b++) {                                    \
		MTFace *tf = &attribs.tface[b].array[a];                                \
		if (attribs.tface[b].glTexco)                                           \
			glTexCoord2fv(tf->uv[vert]);                                        \
		else                                                                    \
			glVertexAttrib2fvARB(attribs.tface[b].glIndex, tf->uv[vert]);       \
	}                                                                           \
	for (b = 0; b < attribs.totmcol; b++) {                                     \
		MCol *cp = &attribs.mcol[b].array[a * 4 + vert];                        \
		GLubyte col[4];                                                         \
		col[0] = cp->b; col[1] = cp->g; col[2] = cp->r; col[3] = cp->a;         \
		glVertexAttrib4ubvARB(attribs.mcol[b].glIndex, col);                    \
	}                                                                           \
	if (attribs.tottang) {                                                      \
		float *tang = attribs.tang.array[a * 4 + vert];                         \
		glVertexAttrib4fvARB(attribs.tang.glIndex, tang);                       \
	}                                                                           \
}

	totface = ccgSubSurf_getNumFaces(ss);
	for (a = 0, i = 0; i < totface; i++) {
		CCGFace *f = ccgdm->faceMap[i].face;
		int S, x, y, drawSmooth;
		int index = GET_INT_FROM_POINTER(ccgSubSurf_getFaceFaceHandle(f));
		int origIndex = ccgDM_getFaceMapIndex(ss, f);
		
		numVerts = ccgSubSurf_getFaceNumVerts(f);

		/* get flags */
		if (faceFlags) {
			drawSmooth = (faceFlags[index].flag & ME_SMOOTH);
			new_matnr = faceFlags[index].mat_nr + 1;
		}
		else {
			drawSmooth = 1;
			new_matnr = 1;
		}

		/* material */
		if (new_matnr != matnr) {
			setMaterial(userData, matnr = new_matnr, &gattribs);
			DM_vertex_attributes_from_gpu(dm, &gattribs, &attribs);
		}

		/* face hiding */
		if ((setFace && (origIndex != ORIGINDEX_NONE) && !setFace(userData, origIndex))) {
			a += gridFaces * gridFaces * numVerts;
			continue;
		}

		/* draw face*/
		glShadeModel(drawSmooth ? GL_SMOOTH : GL_FLAT);
		for (S = 0; S < numVerts; S++) {
			DMGridData *faceGridData = ccgSubSurf_getFaceGridDataArray(ss, f, S);
			DMGridData *vda, *vdb;

			if (drawSmooth) {
				for (y = 0; y < gridFaces; y++) {
					glBegin(GL_QUAD_STRIP);
					for (x = 0; x < gridFaces; x++) {
						vda = &faceGridData[(y + 0) * gridSize + x];
						vdb = &faceGridData[(y + 1) * gridSize + x];
						
						PASSATTRIB(0, 0, 0);
						glNormal3fv(vda->no);
						glVertex3fv(vda->co);

						PASSATTRIB(0, 1, 1);
						glNormal3fv(vdb->no);
						glVertex3fv(vdb->co);

						if (x != gridFaces - 1)
							a++;
					}

					vda = &faceGridData[(y + 0) * gridSize + x];
					vdb = &faceGridData[(y + 1) * gridSize + x];

					PASSATTRIB(0, 0, 3);
					glNormal3fv(vda->no);
					glVertex3fv(vda->co);

					PASSATTRIB(0, 1, 2);
					glNormal3fv(vdb->no);
					glVertex3fv(vdb->co);

					glEnd();

					a++;
				}
			}
			else {
				glBegin(GL_QUADS);
				for (y = 0; y < gridFaces; y++) {
					for (x = 0; x < gridFaces; x++) {
						float *aco = faceGridData[(y + 0) * gridSize + x].co;
						float *bco = faceGridData[(y + 0) * gridSize + x + 1].co;
						float *cco = faceGridData[(y + 1) * gridSize + x + 1].co;
						float *dco = faceGridData[(y + 1) * gridSize + x].co;

						ccgDM_glNormalFast(aco, bco, cco, dco);

						PASSATTRIB(0, 1, 1);
						glVertex3fv(dco);
						PASSATTRIB(1, 1, 2);
						glVertex3fv(cco);
						PASSATTRIB(1, 0, 3);
						glVertex3fv(bco);
						PASSATTRIB(0, 0, 0);
						glVertex3fv(aco);
						
						a++;
					}
				}
				glEnd();
			}
		}
	}

#undef PASSATTRIB
}

static void ccgDM_drawFacesTex_common(DerivedMesh *dm,
                                      DMSetDrawOptionsTex drawParams,
                                      DMSetDrawOptions drawParamsMapped,
                                      DMCompareDrawOptions compareDrawOptions,
                                      void *userData)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	MCol *mcol = dm->getTessFaceDataArray(dm, CD_PREVIEW_MCOL);
	MTFace *tf = DM_get_tessface_data_layer(dm, CD_MTFACE);
	DMFlagMat *faceFlags = ccgdm->faceFlags;
	DMDrawOption draw_option;
	int i, totface, gridSize = ccgSubSurf_getGridSize(ss);
	int gridFaces = gridSize - 1;

	(void) compareDrawOptions;

	ccgdm_pbvh_update(ccgdm);

	if (!mcol)
		mcol = dm->getTessFaceDataArray(dm, CD_MCOL);

	if (!mcol)
		mcol = dm->getTessFaceDataArray(dm, CD_TEXTURE_MCOL);

	totface = ccgSubSurf_getNumFaces(ss);
	for (i = 0; i < totface; i++) {
		CCGFace *f = ccgdm->faceMap[i].face;
		int S, x, y, numVerts = ccgSubSurf_getFaceNumVerts(f);
		int drawSmooth, index = ccgDM_getFaceMapIndex(ss, f);
		int origIndex = GET_INT_FROM_POINTER(ccgSubSurf_getFaceFaceHandle(f));
		unsigned char *cp = NULL;
		int mat_nr;

		if (faceFlags) {
			drawSmooth = (faceFlags[origIndex].flag & ME_SMOOTH);
			mat_nr = faceFlags[origIndex].mat_nr;
		}
		else {
			drawSmooth = 1;
			mat_nr = 0;
		}

		if (drawParams)
			draw_option = drawParams(tf, (mcol != NULL), mat_nr);
		else if (index != ORIGINDEX_NONE)
			draw_option = (drawParamsMapped) ? drawParamsMapped(userData, index) : DM_DRAW_OPTION_NORMAL;
		else
			draw_option = GPU_enable_material(mat_nr, NULL) ? DM_DRAW_OPTION_NORMAL : DM_DRAW_OPTION_SKIP;


		if (draw_option == DM_DRAW_OPTION_SKIP) {
			if (tf) tf += gridFaces * gridFaces * numVerts;
			if (mcol) mcol += gridFaces * gridFaces * numVerts * 4;
			continue;
		}

		/* flag 1 == use vertex colors */
		if (mcol) {
			if (draw_option != DM_DRAW_OPTION_NO_MCOL)
				cp = (unsigned char *)mcol;
			mcol += gridFaces * gridFaces * numVerts * 4;
		}

		for (S = 0; S < numVerts; S++) {
			DMGridData *faceGridData = ccgSubSurf_getFaceGridDataArray(ss, f, S);
			DMGridData *a, *b;

			if (drawSmooth) {
				glShadeModel(GL_SMOOTH);
				for (y = 0; y < gridFaces; y++) {
					glBegin(GL_QUAD_STRIP);
					for (x = 0; x < gridFaces; x++) {
						a = &faceGridData[(y + 0) * gridSize + x];
						b = &faceGridData[(y + 1) * gridSize + x];

						if (tf) glTexCoord2fv(tf->uv[0]);
						if (cp) glColor3ub(cp[3], cp[2], cp[1]);
						glNormal3fv(a->no);
						glVertex3fv(a->co);

						if (tf) glTexCoord2fv(tf->uv[1]);
						if (cp) glColor3ub(cp[7], cp[6], cp[5]);
						glNormal3fv(b->no);
						glVertex3fv(b->co);
						
						if (x != gridFaces - 1) {
							if (tf) tf++;
							if (cp) cp += 16;
						}
					}

					a = &faceGridData[(y + 0) * gridSize + x];
					b = &faceGridData[(y + 1) * gridSize + x];

					if (tf) glTexCoord2fv(tf->uv[3]);
					if (cp) glColor3ub(cp[15], cp[14], cp[13]);
					glNormal3fv(a->no);
					glVertex3fv(a->co);

					if (tf) glTexCoord2fv(tf->uv[2]);
					if (cp) glColor3ub(cp[11], cp[10], cp[9]);
					glNormal3fv(b->no);
					glVertex3fv(b->co);

					if (tf) tf++;
					if (cp) cp += 16;

					glEnd();
				}
			}
			else {
				glShadeModel((cp)? GL_SMOOTH: GL_FLAT);
				glBegin(GL_QUADS);
				for (y = 0; y < gridFaces; y++) {
					for (x = 0; x < gridFaces; x++) {
						float *a_co = faceGridData[(y + 0) * gridSize + x].co;
						float *b_co = faceGridData[(y + 0) * gridSize + x + 1].co;
						float *c_co = faceGridData[(y + 1) * gridSize + x + 1].co;
						float *d_co = faceGridData[(y + 1) * gridSize + x].co;

						ccgDM_glNormalFast(a_co, b_co, c_co, d_co);

						if (tf) glTexCoord2fv(tf->uv[1]);
						if (cp) glColor3ub(cp[7], cp[6], cp[5]);
						glVertex3fv(d_co);

						if (tf) glTexCoord2fv(tf->uv[2]);
						if (cp) glColor3ub(cp[11], cp[10], cp[9]);
						glVertex3fv(c_co);

						if (tf) glTexCoord2fv(tf->uv[3]);
						if (cp) glColor3ub(cp[15], cp[14], cp[13]);
						glVertex3fv(b_co);

						if (tf) glTexCoord2fv(tf->uv[0]);
						if (cp) glColor3ub(cp[3], cp[2], cp[1]);
						glVertex3fv(a_co);

						if (tf) tf++;
						if (cp) cp += 16;
					}
				}
				glEnd();
			}
		}
	}
}

static void ccgDM_drawFacesTex(DerivedMesh *dm,
                               DMSetDrawOptionsTex setDrawOptions,
                               DMCompareDrawOptions compareDrawOptions,
                               void *userData)
{
	ccgDM_drawFacesTex_common(dm, setDrawOptions, NULL, compareDrawOptions, userData);
}

static void ccgDM_drawMappedFacesTex(DerivedMesh *dm,
                                     DMSetDrawOptions setDrawOptions,
                                     DMCompareDrawOptions compareDrawOptions,
                                     void *userData)
{
	ccgDM_drawFacesTex_common(dm, NULL, setDrawOptions, compareDrawOptions, userData);
}

static void ccgDM_drawUVEdges(DerivedMesh *dm)
{

	MFace *mf = dm->getTessFaceArray(dm);
	MTFace *tf = DM_get_tessface_data_layer(dm, CD_MTFACE);
	int i;
	
	if (tf) {
		glBegin(GL_LINES);
		for (i = 0; i < dm->numTessFaceData; i++, mf++, tf++) {
			if (!(mf->flag & ME_HIDE)) {
				glVertex2fv(tf->uv[0]);
				glVertex2fv(tf->uv[1]);
	
				glVertex2fv(tf->uv[1]);
				glVertex2fv(tf->uv[2]);
	
				if (!mf->v4) {
					glVertex2fv(tf->uv[2]);
					glVertex2fv(tf->uv[0]);
				}
				else {
					glVertex2fv(tf->uv[2]);
					glVertex2fv(tf->uv[3]);
	
					glVertex2fv(tf->uv[3]);
					glVertex2fv(tf->uv[0]);
				}
			}
		}
		glEnd();
	}
}

static void ccgDM_drawMappedFaces(DerivedMesh *dm,
                                  DMSetDrawOptions setDrawOptions,
                                  DMSetMaterial setMaterial,
                                  DMCompareDrawOptions compareDrawOptions,
                                  void *userData, DMDrawFlag flag)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	MCol *mcol = NULL;
	int i, gridSize = ccgSubSurf_getGridSize(ss);
	DMFlagMat *faceFlags = ccgdm->faceFlags;
	int useColors = flag & DM_DRAW_USE_COLORS;
	int gridFaces = gridSize - 1, totface;

	/* currently unused -- each original face is handled separately */
	(void)compareDrawOptions;

	if (useColors) {
		mcol = dm->getTessFaceDataArray(dm, CD_PREVIEW_MCOL);
		if (!mcol)
			mcol = dm->getTessFaceDataArray(dm, CD_MCOL);
	}

	totface = ccgSubSurf_getNumFaces(ss);
	for (i = 0; i < totface; i++) {
		CCGFace *f = ccgdm->faceMap[i].face;
		int S, x, y, numVerts = ccgSubSurf_getFaceNumVerts(f);
		int drawSmooth, index = ccgDM_getFaceMapIndex(ss, f);
		int origIndex;
		unsigned char *cp = NULL;

		origIndex = GET_INT_FROM_POINTER(ccgSubSurf_getFaceFaceHandle(f));

		if (flag & DM_DRAW_ALWAYS_SMOOTH) drawSmooth = 1;
		else if (faceFlags) drawSmooth = (faceFlags[origIndex].flag & ME_SMOOTH);
		else drawSmooth = 1;

		if (mcol) {
			cp = (unsigned char *)mcol;
			mcol += gridFaces * gridFaces * numVerts * 4;
		}

		{
			DMDrawOption draw_option = DM_DRAW_OPTION_NORMAL;

			if (index == ORIGINDEX_NONE)
				draw_option = setMaterial(faceFlags ? faceFlags[origIndex].mat_nr + 1 : 1, NULL);  /* XXX, no faceFlags no material */
			else if (setDrawOptions)
				draw_option = setDrawOptions(userData, index);

			if (draw_option != DM_DRAW_OPTION_SKIP) {
				if (draw_option == DM_DRAW_OPTION_STIPPLE) {
					glEnable(GL_POLYGON_STIPPLE);
					glPolygonStipple(stipple_quarttone);
				}

				/* no need to set shading mode to flat because
				 *  normals are already used to change shading */
				glShadeModel(GL_SMOOTH);
				
				for (S = 0; S < numVerts; S++) {
					DMGridData *faceGridData = ccgSubSurf_getFaceGridDataArray(ss, f, S);
					if (drawSmooth) {
						for (y = 0; y < gridFaces; y++) {
							DMGridData *a, *b;
							glBegin(GL_QUAD_STRIP);
							for (x = 0; x < gridFaces; x++) {
								a = &faceGridData[(y + 0) * gridSize + x];
								b = &faceGridData[(y + 1) * gridSize + x];
	
								if (cp) glColor3ub(cp[3], cp[2], cp[1]);
								glNormal3fv(a->no);
								glVertex3fv(a->co);
								if (cp) glColor3ub(cp[7], cp[6], cp[5]);
								glNormal3fv(b->no);
								glVertex3fv(b->co);

								if (x != gridFaces - 1) {
									if (cp) cp += 16;
								}
							}

							a = &faceGridData[(y + 0) * gridSize + x];
							b = &faceGridData[(y + 1) * gridSize + x];

							if (cp) glColor3ub(cp[15], cp[14], cp[13]);
							glNormal3fv(a->no);
							glVertex3fv(a->co);
							if (cp) glColor3ub(cp[11], cp[10], cp[9]);
							glNormal3fv(b->no);
							glVertex3fv(b->co);

							if (cp) cp += 16;

							glEnd();
						}
					}
					else {
						glBegin(GL_QUADS);
						for (y = 0; y < gridFaces; y++) {
							for (x = 0; x < gridFaces; x++) {
								float *a = faceGridData[(y + 0) * gridSize + x].co;
								float *b = faceGridData[(y + 0) * gridSize + x + 1].co;
								float *c = faceGridData[(y + 1) * gridSize + x + 1].co;
								float *d = faceGridData[(y + 1) * gridSize + x].co;

								ccgDM_glNormalFast(a, b, c, d);
	
								if (cp) glColor3ub(cp[7], cp[6], cp[5]);
								glVertex3fv(d);
								if (cp) glColor3ub(cp[11], cp[10], cp[9]);
								glVertex3fv(c);
								if (cp) glColor3ub(cp[15], cp[14], cp[13]);
								glVertex3fv(b);
								if (cp) glColor3ub(cp[3], cp[2], cp[1]);
								glVertex3fv(a);

								if (cp) cp += 16;
							}
						}
						glEnd();
					}
				}
				if (draw_option == DM_DRAW_OPTION_STIPPLE)
					glDisable(GL_POLYGON_STIPPLE);
			}
		}
	}
}

static void ccgDM_drawMappedEdges(DerivedMesh *dm,
                                  DMSetDrawOptions setDrawOptions,
                                  void *userData)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	CCGEdgeIterator *ei = ccgSubSurf_getEdgeIterator(ss);
	int i, useAging, edgeSize = ccgSubSurf_getEdgeSize(ss);

	ccgSubSurf_getUseAgeCounts(ss, &useAging, NULL, NULL, NULL);

	for (; !ccgEdgeIterator_isStopped(ei); ccgEdgeIterator_next(ei)) {
		CCGEdge *e = ccgEdgeIterator_getCurrent(ei);
		DMGridData *edgeData = ccgSubSurf_getEdgeDataArray(ss, e);
		int index = ccgDM_getEdgeMapIndex(ss, e);

		glBegin(GL_LINE_STRIP);
		if (index != -1 && (!setDrawOptions || (setDrawOptions(userData, index) != DM_DRAW_OPTION_SKIP))) {
			if (useAging && !(G.f & G_BACKBUFSEL)) {
				int ageCol = 255 - ccgSubSurf_getEdgeAge(ss, e) * 4;
				glColor3ub(0, ageCol > 0 ? ageCol : 0, 0);
			}

			for (i = 0; i < edgeSize - 1; i++) {
				glVertex3fv(edgeData[i].co);
				glVertex3fv(edgeData[i + 1].co);
			}
		}
		glEnd();
	}

	ccgEdgeIterator_free(ei);
}

static void ccgDM_drawMappedEdgesInterp(DerivedMesh *dm,
                                        DMSetDrawOptions setDrawOptions,
                                        DMSetDrawInterpOptions setDrawInterpOptions,
                                        void *userData)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	CCGEdgeIterator *ei = ccgSubSurf_getEdgeIterator(ss);
	int i, useAging, edgeSize = ccgSubSurf_getEdgeSize(ss);

	ccgSubSurf_getUseAgeCounts(ss, &useAging, NULL, NULL, NULL);

	for (; !ccgEdgeIterator_isStopped(ei); ccgEdgeIterator_next(ei)) {
		CCGEdge *e = ccgEdgeIterator_getCurrent(ei);
		DMGridData *edgeData = ccgSubSurf_getEdgeDataArray(ss, e);
		int index = ccgDM_getEdgeMapIndex(ss, e);

		glBegin(GL_LINE_STRIP);
		if (index != -1 && (!setDrawOptions || (setDrawOptions(userData, index) != DM_DRAW_OPTION_SKIP))) {
			for (i = 0; i < edgeSize; i++) {
				setDrawInterpOptions(userData, index, (float) i / (edgeSize - 1));

				if (useAging && !(G.f & G_BACKBUFSEL)) {
					int ageCol = 255 - ccgSubSurf_getEdgeAge(ss, e) * 4;
					glColor3ub(0, ageCol > 0 ? ageCol : 0, 0);
				}

				glVertex3fv(edgeData[i].co);
			}
		}
		glEnd();
	}

	ccgEdgeIterator_free(ei);
}

static void ccgDM_foreachMappedFaceCenter(
    DerivedMesh *dm,
    void (*func)(void *userData, int index, const float co[3], const float no[3]),
    void *userData)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;
	CCGSubSurf *ss = ccgdm->ss;
	CCGFaceIterator *fi = ccgSubSurf_getFaceIterator(ss);

	for (; !ccgFaceIterator_isStopped(fi); ccgFaceIterator_next(fi)) {
		CCGFace *f = ccgFaceIterator_getCurrent(fi);
		int index = ccgDM_getFaceMapIndex(ss, f);

		if (index != -1) {
			/* Face center data normal isn't updated atm. */
			DMGridData *vd = ccgSubSurf_getFaceGridData(ss, f, 0, 0, 0);

			func(userData, index, vd->co, vd->no);
		}
	}

	ccgFaceIterator_free(fi);
}

static void ccgDM_release(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *) dm;

	if (DM_release(dm)) {
		/* Before freeing, need to update the displacement map */
		if (ccgdm->multires.modified_flags) {
			/* Check that mmd still exists */
			if (!ccgdm->multires.local_mmd &&
			    BLI_findindex(&ccgdm->multires.ob->modifiers, ccgdm->multires.mmd) < 0)
				ccgdm->multires.mmd = NULL;
			
			if (ccgdm->multires.mmd) {
				if (ccgdm->multires.modified_flags & MULTIRES_COORDS_MODIFIED)
					multires_modifier_update_mdisps(dm);
				if (ccgdm->multires.modified_flags & MULTIRES_HIDDEN_MODIFIED)
					multires_modifier_update_hidden(dm);
			}
		}

		if (ccgdm->ehash)
			BLI_edgehash_free(ccgdm->ehash, NULL);

		if (ccgdm->reverseFaceMap) MEM_freeN(ccgdm->reverseFaceMap);
		if (ccgdm->gridFaces) MEM_freeN(ccgdm->gridFaces);
		if (ccgdm->gridData) MEM_freeN(ccgdm->gridData);
		if (ccgdm->gridAdjacency) MEM_freeN(ccgdm->gridAdjacency);
		if (ccgdm->gridOffset) MEM_freeN(ccgdm->gridOffset);
		if (ccgdm->gridFlagMats) MEM_freeN(ccgdm->gridFlagMats);
		if (ccgdm->gridHidden) {
			int i, numGrids = dm->getNumGrids(dm);
			for (i = 0; i < numGrids; i++) {
				if (ccgdm->gridHidden[i])
					MEM_freeN(ccgdm->gridHidden[i]);
			}
			MEM_freeN(ccgdm->gridHidden);
		}
		if (ccgdm->freeSS) ccgSubSurf_free(ccgdm->ss);
		if (ccgdm->pmap) MEM_freeN(ccgdm->pmap);
		if (ccgdm->pmap_mem) MEM_freeN(ccgdm->pmap_mem);
		MEM_freeN(ccgdm->edgeFlags);
		MEM_freeN(ccgdm->faceFlags);
		MEM_freeN(ccgdm->vertMap);
		MEM_freeN(ccgdm->edgeMap);
		MEM_freeN(ccgdm->faceMap);
		MEM_freeN(ccgdm);
	}
}

static void ccg_loops_to_corners(CustomData *fdata, CustomData *ldata, 
                                 CustomData *pdata, int loopstart, int findex,  int polyindex,
                                 const int numTex, const int numCol, const int hasPCol, const int hasOrigSpace)
{
	MTFace *texface;
	MTexPoly *texpoly;
	MCol *mcol;
	MLoopCol *mloopcol;
	MLoopUV *mloopuv;
	int i, j;

	for (i = 0; i < numTex; i++) {
		texface = CustomData_get_n(fdata, CD_MTFACE, findex, i);
		texpoly = CustomData_get_n(pdata, CD_MTEXPOLY, polyindex, i);
		
		ME_MTEXFACE_CPY(texface, texpoly);

		mloopuv = CustomData_get_n(ldata, CD_MLOOPUV, loopstart, i);
		for (j = 0; j < 4; j++, mloopuv++) {
			copy_v2_v2(texface->uv[j], mloopuv->uv);
		}
	}

	for (i = 0; i < numCol; i++) {
		mloopcol = CustomData_get_n(ldata, CD_MLOOPCOL, loopstart, i);
		mcol = CustomData_get_n(fdata, CD_MCOL, findex, i);

		for (j = 0; j < 4; j++, mloopcol++) {
			MESH_MLOOPCOL_TO_MCOL(mloopcol, &mcol[j]);
		}
	}
	
	if (hasPCol) {
		mloopcol = CustomData_get(ldata, loopstart, CD_PREVIEW_MLOOPCOL);
		mcol = CustomData_get(fdata, findex, CD_PREVIEW_MCOL);

		for (j = 0; j < 4; j++, mloopcol++) {
			MESH_MLOOPCOL_TO_MCOL(mloopcol, &mcol[j]);
		}
	}

	if (hasOrigSpace) {
		OrigSpaceFace *of = CustomData_get(fdata, findex, CD_ORIGSPACE);
		OrigSpaceLoop *lof;

		lof = CustomData_get(ldata, loopstart, CD_ORIGSPACE_MLOOP);
		for (j = 0; j < 4; j++, lof++) {
			copy_v2_v2(of->uv[j], lof->uv);
		}
	}
}

static void *ccgDM_get_vert_data_layer(DerivedMesh *dm, int type)
{
	if (type == CD_ORIGINDEX) {
		/* create origindex on demand to save memory */
		CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;
		CCGSubSurf *ss = ccgdm->ss;
		int *origindex;
		int a, index, totnone, totorig;

		/* Avoid re-creation if the layer exists already */
		origindex = DM_get_vert_data_layer(dm, CD_ORIGINDEX);
		if (origindex) {
			return origindex;
		}

		DM_add_vert_layer(dm, CD_ORIGINDEX, CD_CALLOC, NULL);
		origindex = DM_get_vert_data_layer(dm, CD_ORIGINDEX);

		totorig = ccgSubSurf_getNumVerts(ss);
		totnone = dm->numVertData - totorig;

		/* original vertices are at the end */
		for (a = 0; a < totnone; a++)
			origindex[a] = ORIGINDEX_NONE;

		for (index = 0; index < totorig; index++, a++) {
			CCGVert *v = ccgdm->vertMap[index].vert;
			origindex[a] = ccgDM_getVertMapIndex(ccgdm->ss, v);
		}

		return origindex;
	}

	return DM_get_vert_data_layer(dm, type);
}

static void *ccgDM_get_edge_data_layer(DerivedMesh *dm, int type)
{
	if (type == CD_ORIGINDEX) {
		/* create origindex on demand to save memory */
		CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;
		CCGSubSurf *ss = ccgdm->ss;
		int *origindex;
		int a, i, index, totnone, totorig, totedge;
		int edgeSize = ccgSubSurf_getEdgeSize(ss);

		/* Avoid re-creation if the layer exists already */
		origindex = DM_get_edge_data_layer(dm, CD_ORIGINDEX);
		if (origindex) {
			return origindex;
		}

		DM_add_edge_layer(dm, CD_ORIGINDEX, CD_CALLOC, NULL);
		origindex = DM_get_edge_data_layer(dm, CD_ORIGINDEX);

		totedge = ccgSubSurf_getNumEdges(ss);
		totorig = totedge * (edgeSize - 1);
		totnone = dm->numEdgeData - totorig;

		/* original edges are at the end */
		for (a = 0; a < totnone; a++)
			origindex[a] = ORIGINDEX_NONE;

		for (index = 0; index < totedge; index++) {
			CCGEdge *e = ccgdm->edgeMap[index].edge;
			int mapIndex = ccgDM_getEdgeMapIndex(ss, e);

			for (i = 0; i < edgeSize - 1; i++, a++)
				origindex[a] = mapIndex;
		}

		return origindex;
	}

	return DM_get_edge_data_layer(dm, type);
}

static void *ccgDM_get_tessface_data_layer(DerivedMesh *dm, int type)
{
	if (type == CD_ORIGINDEX) {
		/* create origindex on demand to save memory */
		CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;
		CCGSubSurf *ss = ccgdm->ss;
		int *origindex;
		int a, i, index, totface;
		int gridFaces = ccgSubSurf_getGridSize(ss) - 1;

		/* Avoid re-creation if the layer exists already */
		origindex = DM_get_tessface_data_layer(dm, CD_ORIGINDEX);
		if (origindex) {
			return origindex;
		}

		DM_add_tessface_layer(dm, CD_ORIGINDEX, CD_CALLOC, NULL);
		origindex = DM_get_tessface_data_layer(dm, CD_ORIGINDEX);

		totface = ccgSubSurf_getNumFaces(ss);

		for (a = 0, index = 0; index < totface; index++) {
			CCGFace *f = ccgdm->faceMap[index].face;
			int numVerts = ccgSubSurf_getFaceNumVerts(f);
			int mapIndex = ccgDM_getFaceMapIndex(ss, f);

			for (i = 0; i < gridFaces * gridFaces * numVerts; i++, a++)
				origindex[a] = mapIndex;
		}

		return origindex;
	}

	return DM_get_tessface_data_layer(dm, type);
}

static void *ccgDM_get_vert_data(DerivedMesh *dm, int index, int type)
{
	if (type == CD_ORIGINDEX) {
		/* ensure creation of CD_ORIGINDEX layer */
		ccgDM_get_vert_data_layer(dm, type);
	}

	return DM_get_vert_data(dm, index, type);
}

static void *ccgDM_get_edge_data(DerivedMesh *dm, int index, int type)
{
	if (type == CD_ORIGINDEX) {
		/* ensure creation of CD_ORIGINDEX layer */
		ccgDM_get_edge_data_layer(dm, type);
	}

	return DM_get_edge_data(dm, index, type);
}

static void *ccgDM_get_tessface_data(DerivedMesh *dm, int index, int type)
{
	if (type == CD_ORIGINDEX) {
		/* ensure creation of CD_ORIGINDEX layer */
		ccgDM_get_tessface_data_layer(dm, type);
	}

	return DM_get_tessface_data(dm, index, type);
}

static int ccgDM_getNumGrids(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;
	int index, numFaces, numGrids;

	numFaces = ccgSubSurf_getNumFaces(ccgdm->ss);
	numGrids = 0;

	for (index = 0; index < numFaces; index++) {
		CCGFace *f = ccgdm->faceMap[index].face;
		numGrids += ccgSubSurf_getFaceNumVerts(f);
	}

	return numGrids;
}

static int ccgDM_getGridSize(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;
	return ccgSubSurf_getGridSize(ccgdm->ss);
}

static int ccgdm_adjacent_grid(int *gridOffset, CCGFace *f, int S, int offset)
{
	CCGFace *adjf;
	CCGEdge *e;
	int i, j = 0, numFaces, fIndex, numEdges = 0;

	e = ccgSubSurf_getFaceEdge(f, S);
	numFaces = ccgSubSurf_getEdgeNumFaces(e);

	if (numFaces != 2)
		return -1;

	for (i = 0; i < numFaces; i++) {
		adjf = ccgSubSurf_getEdgeFace(e, i);

		if (adjf != f) {
			numEdges = ccgSubSurf_getFaceNumVerts(adjf);
			for (j = 0; j < numEdges; j++)
				if (ccgSubSurf_getFaceEdge(adjf, j) == e)
					break;

			if (j != numEdges)
				break;
		}
	}

	if (numEdges == 0)
		return -1;
	
	fIndex = GET_INT_FROM_POINTER(ccgSubSurf_getFaceFaceHandle(adjf));

	return gridOffset[fIndex] + (j + offset) % numEdges;
}

static void ccgdm_create_grids(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;
	CCGSubSurf *ss = ccgdm->ss;
	DMGridData **gridData;
	DMGridAdjacency *gridAdjacency, *adj;
	DMFlagMat *gridFlagMats;
	CCGFace **gridFaces;
	int *gridOffset;
	int index, numFaces, numGrids, S, gIndex /*, gridSize*/;

	if (ccgdm->gridData)
		return;
	
	numGrids = ccgDM_getNumGrids(dm);
	numFaces = ccgSubSurf_getNumFaces(ss);
	/*gridSize = ccgDM_getGridSize(dm);*/  /*UNUSED*/

	/* compute offset into grid array for each face */
	gridOffset = MEM_mallocN(sizeof(int) * numFaces, "ccgdm.gridOffset");

	for (gIndex = 0, index = 0; index < numFaces; index++) {
		CCGFace *f = ccgdm->faceMap[index].face;
		int numVerts = ccgSubSurf_getFaceNumVerts(f);

		gridOffset[index] = gIndex;
		gIndex += numVerts;
	}

	/* compute grid data */
	gridData = MEM_mallocN(sizeof(DMGridData *) * numGrids, "ccgdm.gridData");
	gridAdjacency = MEM_mallocN(sizeof(DMGridAdjacency) * numGrids, "ccgdm.gridAdjacency");
	gridFaces = MEM_mallocN(sizeof(CCGFace *) * numGrids, "ccgdm.gridFaces");
	gridFlagMats = MEM_mallocN(sizeof(DMFlagMat) * numGrids, "ccgdm.gridFlagMats");

	ccgdm->gridHidden = MEM_callocN(sizeof(BLI_bitmap) * numGrids, "ccgdm.gridHidden");

	for (gIndex = 0, index = 0; index < numFaces; index++) {
		CCGFace *f = ccgdm->faceMap[index].face;
		int numVerts = ccgSubSurf_getFaceNumVerts(f);

		for (S = 0; S < numVerts; S++, gIndex++) {
			int prevS = (S - 1 + numVerts) % numVerts;
			int nextS = (S + 1 + numVerts) % numVerts;

			gridData[gIndex] = ccgSubSurf_getFaceGridDataArray(ss, f, S);
			gridFaces[gIndex] = f;
			gridFlagMats[gIndex] = ccgdm->faceFlags[index];

			adj = &gridAdjacency[gIndex];

			adj->index[0] = gIndex - S + nextS;
			adj->rotation[0] = 3;
			adj->index[1] = ccgdm_adjacent_grid(gridOffset, f, prevS, 0);
			adj->rotation[1] = 1;
			adj->index[2] = ccgdm_adjacent_grid(gridOffset, f, S, 1);
			adj->rotation[2] = 3;
			adj->index[3] = gIndex - S + prevS;
			adj->rotation[3] = 1;
		}
	}

	ccgdm->gridData = gridData;
	ccgdm->gridFaces = gridFaces;
	ccgdm->gridAdjacency = gridAdjacency;
	ccgdm->gridOffset = gridOffset;
	ccgdm->gridFlagMats = gridFlagMats;
}

static DMGridData **ccgDM_getGridData(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;

	ccgdm_create_grids(dm);
	return ccgdm->gridData;
}

static DMGridAdjacency *ccgDM_getGridAdjacency(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;

	ccgdm_create_grids(dm);
	return ccgdm->gridAdjacency;
}

static int *ccgDM_getGridOffset(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;

	ccgdm_create_grids(dm);
	return ccgdm->gridOffset;
}

static DMFlagMat *ccgDM_getGridFlagMats(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;
	
	ccgdm_create_grids(dm);
	return ccgdm->gridFlagMats;
}

static BLI_bitmap *ccgDM_getGridHidden(DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;
	
	ccgdm_create_grids(dm);
	return ccgdm->gridHidden;
}

static const MeshElemMap *ccgDM_getPolyMap(Object *ob, DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;

	if (!ccgdm->multires.mmd && !ccgdm->pmap && ob->type == OB_MESH) {
		Mesh *me = ob->data;

		create_vert_poly_map(&ccgdm->pmap, &ccgdm->pmap_mem,
		                     me->mpoly, me->mloop,
		                     me->totvert, me->totpoly, me->totloop);
	}

	return ccgdm->pmap;
}

static int ccgDM_use_grid_pbvh(CCGDerivedMesh *ccgdm)
{
	MultiresModifierData *mmd = ccgdm->multires.mmd;

	/* both of multires and subsurf modifiers are CCG, but
	 * grids should only be used when sculpting on multires */
	if (!mmd)
		return 0;

	return 1;
}

static struct PBVH *ccgDM_getPBVH(Object *ob, DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = (CCGDerivedMesh *)dm;
	int gridSize, numGrids, grid_pbvh;

	if (!ob) {
		ccgdm->pbvh = NULL;
		return NULL;
	}

	if (!ob->sculpt)
		return NULL;

	grid_pbvh = ccgDM_use_grid_pbvh(ccgdm);

	if (ob->sculpt->pbvh) {
		if (grid_pbvh) {
			/* pbvh's grids, gridadj and gridfaces points to data inside ccgdm
			 * but this can be freed on ccgdm release, this updates the pointers
			 * when the ccgdm gets remade, the assumption is that the topology
			 * does not change. */
			ccgdm_create_grids(dm);
			BLI_pbvh_grids_update(ob->sculpt->pbvh, ccgdm->gridData, ccgdm->gridAdjacency, (void **)ccgdm->gridFaces);
		}

		ccgdm->pbvh = ob->sculpt->pbvh;
	}

	if (ccgdm->pbvh)
		return ccgdm->pbvh;

	/* no pbvh exists yet, we need to create one. only in case of multires
	 * we build a pbvh over the modified mesh, in other cases the base mesh
	 * is being sculpted, so we build a pbvh from that. */
	if (grid_pbvh) {
		ccgdm_create_grids(dm);

		gridSize = ccgDM_getGridSize(dm);
		numGrids = ccgDM_getNumGrids(dm);

		ob->sculpt->pbvh = ccgdm->pbvh = BLI_pbvh_new();
		BLI_pbvh_build_grids(ccgdm->pbvh, ccgdm->gridData, ccgdm->gridAdjacency,
		                     numGrids, gridSize, (void **)ccgdm->gridFaces, ccgdm->gridFlagMats, ccgdm->gridHidden);
	}
	else if (ob->type == OB_MESH) {
		Mesh *me = ob->data;
		ob->sculpt->pbvh = ccgdm->pbvh = BLI_pbvh_new();
		BLI_assert(!(me->mface == NULL && me->mpoly != NULL)); /* BMESH ONLY complain if mpoly is valid but not mface */
		BLI_pbvh_build_mesh(ccgdm->pbvh, me->mface, me->mvert,
		                    me->totface, me->totvert);
	}

	return ccgdm->pbvh;
}

static void ccgDM_recalcTessellation(DerivedMesh *UNUSED(dm))
{
	/* Nothing to do: CCG handles creating its own tessfaces */
}

static void ccgDM_calcNormals(DerivedMesh *UNUSED(dm))
{
	/* Nothing to do: CCG calculates normals during drawing */
}

static CCGDerivedMesh *getCCGDerivedMesh(CCGSubSurf *ss,
                                         int drawInteriorEdges,
                                         int useSubsurfUv,
                                         DerivedMesh *dm)
{
	CCGDerivedMesh *ccgdm = MEM_callocN(sizeof(*ccgdm), "ccgdm");
	CCGVertIterator *vi;
	CCGEdgeIterator *ei;
	CCGFaceIterator *fi;
	int index, totvert, totedge, totface;
	int i;
	int vertNum, edgeNum, faceNum;
	int *vertOrigIndex, *faceOrigIndex, *polyOrigIndex, *base_polyOrigIndex; /* *edgeOrigIndex - as yet, unused  */
	short *edgeFlags;
	DMFlagMat *faceFlags;
	int *loopidx = NULL, *vertidx = NULL, *polyidx = NULL;
	BLI_array_declare(loopidx);
	BLI_array_declare(vertidx);
	int loopindex, loopindex2;
	int edgeSize, has_edge_origindex;
	int gridSize;
	int gridFaces, gridCuts;
	/*int gridSideVerts;*/
	int gridSideEdges;
	int numTex, numCol;
	int hasPCol, hasOrigSpace;
	int gridInternalEdges;
	float *w = NULL;
	WeightTable wtable = {0};
	/* MCol *mcol; */ /* UNUSED */
	MEdge *medge = NULL;
	/* MFace *mface = NULL; */
	MPoly *mpoly = NULL;

	DM_from_template(&ccgdm->dm, dm, DM_TYPE_CCGDM,
	                 ccgSubSurf_getNumFinalVerts(ss),
	                 ccgSubSurf_getNumFinalEdges(ss),
	                 ccgSubSurf_getNumFinalFaces(ss),
	                 ccgSubSurf_getNumFinalFaces(ss) * 4,
	                 ccgSubSurf_getNumFinalFaces(ss));

	CustomData_free_layer_active(&ccgdm->dm.polyData, CD_NORMAL,
	                             ccgdm->dm.numPolyData);
	
	numTex = CustomData_number_of_layers(&ccgdm->dm.loopData, CD_MLOOPUV);
	numCol = CustomData_number_of_layers(&ccgdm->dm.loopData, CD_MLOOPCOL);
	hasPCol = CustomData_has_layer(&ccgdm->dm.loopData, CD_PREVIEW_MLOOPCOL);
	hasOrigSpace = CustomData_has_layer(&ccgdm->dm.loopData, CD_ORIGSPACE_MLOOP);
	
	if (
	    (numTex && CustomData_number_of_layers(&ccgdm->dm.faceData, CD_MTFACE) != numTex)  ||
	    (numCol && CustomData_number_of_layers(&ccgdm->dm.faceData, CD_MCOL) != numCol)    ||
	    (hasPCol && !CustomData_has_layer(&ccgdm->dm.faceData, CD_PREVIEW_MCOL))            ||
	    (hasOrigSpace && !CustomData_has_layer(&ccgdm->dm.faceData, CD_ORIGSPACE)) )
	{
		CustomData_from_bmeshpoly(&ccgdm->dm.faceData,
		                          &ccgdm->dm.polyData,
		                          &ccgdm->dm.loopData,
		                          ccgSubSurf_getNumFinalFaces(ss));
	}

	/* We absolutely need that layer, else it's no valid tessellated data! */
	polyidx = CustomData_add_layer(&ccgdm->dm.faceData, CD_POLYINDEX, CD_CALLOC,
	                               NULL, ccgSubSurf_getNumFinalFaces(ss));

	ccgdm->dm.getMinMax = ccgDM_getMinMax;
	ccgdm->dm.getNumVerts = ccgDM_getNumVerts;
	ccgdm->dm.getNumEdges = ccgDM_getNumEdges;
	ccgdm->dm.getNumTessFaces = ccgDM_getNumTessFaces;
	ccgdm->dm.getNumLoops = ccgDM_getNumLoops;
	/* reuse of ccgDM_getNumTessFaces is intentional here: subsurf polys are just created from tessfaces */
	ccgdm->dm.getNumPolys = ccgDM_getNumTessFaces;

	ccgdm->dm.getNumGrids = ccgDM_getNumGrids;
	ccgdm->dm.getPBVH = ccgDM_getPBVH;

	ccgdm->dm.getVert = ccgDM_getFinalVert;
	ccgdm->dm.getEdge = ccgDM_getFinalEdge;
	ccgdm->dm.getTessFace = ccgDM_getFinalFace;
	ccgdm->dm.getVertCo = ccgDM_getFinalVertCo;
	ccgdm->dm.getVertNo = ccgDM_getFinalVertNo;
	ccgdm->dm.copyVertArray = ccgDM_copyFinalVertArray;
	ccgdm->dm.copyEdgeArray = ccgDM_copyFinalEdgeArray;
	ccgdm->dm.copyTessFaceArray = ccgDM_copyFinalFaceArray;
	ccgdm->dm.copyLoopArray = ccgDM_copyFinalLoopArray;
	ccgdm->dm.copyPolyArray = ccgDM_copyFinalPolyArray;

	ccgdm->dm.getVertData = ccgDM_get_vert_data;
	ccgdm->dm.getEdgeData = ccgDM_get_edge_data;
	ccgdm->dm.getTessFaceData = ccgDM_get_tessface_data;
	ccgdm->dm.getVertDataArray = ccgDM_get_vert_data_layer;
	ccgdm->dm.getEdgeDataArray = ccgDM_get_edge_data_layer;
	ccgdm->dm.getTessFaceDataArray = ccgDM_get_tessface_data_layer;
	ccgdm->dm.getNumGrids = ccgDM_getNumGrids;
	ccgdm->dm.getGridSize = ccgDM_getGridSize;
	ccgdm->dm.getGridData = ccgDM_getGridData;
	ccgdm->dm.getGridAdjacency = ccgDM_getGridAdjacency;
	ccgdm->dm.getGridOffset = ccgDM_getGridOffset;
	ccgdm->dm.getGridFlagMats = ccgDM_getGridFlagMats;
	ccgdm->dm.getGridHidden = ccgDM_getGridHidden;
	ccgdm->dm.getPolyMap = ccgDM_getPolyMap;
	ccgdm->dm.getPBVH = ccgDM_getPBVH;

	ccgdm->dm.getTessFace = ccgDM_getFinalFace;
	ccgdm->dm.copyVertArray = ccgDM_copyFinalVertArray;
	ccgdm->dm.copyEdgeArray = ccgDM_copyFinalEdgeArray;
	ccgdm->dm.copyTessFaceArray = ccgDM_copyFinalFaceArray;

	ccgdm->dm.calcNormals = ccgDM_calcNormals;
	ccgdm->dm.recalcTessellation = ccgDM_recalcTessellation;

	ccgdm->dm.getVertCos = ccgdm_getVertCos;
	ccgdm->dm.foreachMappedVert = ccgDM_foreachMappedVert;
	ccgdm->dm.foreachMappedEdge = ccgDM_foreachMappedEdge;
	ccgdm->dm.foreachMappedFaceCenter = ccgDM_foreachMappedFaceCenter;
	
	ccgdm->dm.drawVerts = ccgDM_drawVerts;
	ccgdm->dm.drawEdges = ccgDM_drawEdges;
	ccgdm->dm.drawLooseEdges = ccgDM_drawLooseEdges;
	ccgdm->dm.drawFacesSolid = ccgDM_drawFacesSolid;
	ccgdm->dm.drawFacesTex = ccgDM_drawFacesTex;
	ccgdm->dm.drawFacesGLSL = ccgDM_drawFacesGLSL;
	ccgdm->dm.drawMappedFaces = ccgDM_drawMappedFaces;
	ccgdm->dm.drawMappedFacesTex = ccgDM_drawMappedFacesTex;
	ccgdm->dm.drawMappedFacesGLSL = ccgDM_drawMappedFacesGLSL;
	ccgdm->dm.drawMappedFacesMat = ccgDM_drawMappedFacesMat;
	ccgdm->dm.drawUVEdges = ccgDM_drawUVEdges;

	ccgdm->dm.drawMappedEdgesInterp = ccgDM_drawMappedEdgesInterp;
	ccgdm->dm.drawMappedEdges = ccgDM_drawMappedEdges;
	
	ccgdm->dm.release = ccgDM_release;
	
	ccgdm->ss = ss;
	ccgdm->drawInteriorEdges = drawInteriorEdges;
	ccgdm->useSubsurfUv = useSubsurfUv;

	totvert = ccgSubSurf_getNumVerts(ss);
	ccgdm->vertMap = MEM_mallocN(totvert * sizeof(*ccgdm->vertMap), "vertMap");
	vi = ccgSubSurf_getVertIterator(ss);
	for (; !ccgVertIterator_isStopped(vi); ccgVertIterator_next(vi)) {
		CCGVert *v = ccgVertIterator_getCurrent(vi);

		ccgdm->vertMap[GET_INT_FROM_POINTER(ccgSubSurf_getVertVertHandle(v))].vert = v;
	}
	ccgVertIterator_free(vi);

	totedge = ccgSubSurf_getNumEdges(ss);
	ccgdm->edgeMap = MEM_mallocN(totedge * sizeof(*ccgdm->edgeMap), "edgeMap");
	ei = ccgSubSurf_getEdgeIterator(ss);
	for (; !ccgEdgeIterator_isStopped(ei); ccgEdgeIterator_next(ei)) {
		CCGEdge *e = ccgEdgeIterator_getCurrent(ei);

		ccgdm->edgeMap[GET_INT_FROM_POINTER(ccgSubSurf_getEdgeEdgeHandle(e))].edge = e;
	}

	totface = ccgSubSurf_getNumFaces(ss);
	ccgdm->faceMap = MEM_mallocN(totface * sizeof(*ccgdm->faceMap), "faceMap");
	fi = ccgSubSurf_getFaceIterator(ss);
	for (; !ccgFaceIterator_isStopped(fi); ccgFaceIterator_next(fi)) {
		CCGFace *f = ccgFaceIterator_getCurrent(fi);

		ccgdm->faceMap[GET_INT_FROM_POINTER(ccgSubSurf_getFaceFaceHandle(f))].face = f;
	}
	ccgFaceIterator_free(fi);

	ccgdm->reverseFaceMap = MEM_callocN(sizeof(int) * ccgSubSurf_getNumFinalFaces(ss), "reverseFaceMap");

	edgeSize = ccgSubSurf_getEdgeSize(ss);
	gridSize = ccgSubSurf_getGridSize(ss);
	gridFaces = gridSize - 1;
	gridCuts = gridSize - 2;
	/*gridInternalVerts = gridSideVerts * gridSideVerts; - as yet, unused */
	gridSideEdges = gridSize - 1;
	gridInternalEdges = (gridSideEdges - 1) * gridSideEdges * 2; 

	vertNum = 0;
	edgeNum = 0;
	faceNum = 0;

	/* mvert = dm->getVertArray(dm); */ /* UNUSED */
	medge = dm->getEdgeArray(dm);
	/* mface = dm->getTessFaceArray(dm); */ /* UNUSED */

	mpoly = CustomData_get_layer(&dm->polyData, CD_MPOLY);
	base_polyOrigIndex = CustomData_get_layer(&dm->polyData, CD_ORIGINDEX);
	
	/*CDDM hack*/
	edgeFlags = ccgdm->edgeFlags = MEM_callocN(sizeof(short) * totedge, "edgeFlags");
	faceFlags = ccgdm->faceFlags = MEM_callocN(sizeof(DMFlagMat) * totface, "faceFlags");

	vertOrigIndex = DM_get_vert_data_layer(&ccgdm->dm, CD_ORIGINDEX);
	/*edgeOrigIndex = DM_get_edge_data_layer(&ccgdm->dm, CD_ORIGINDEX);*/
	faceOrigIndex = DM_get_tessface_data_layer(&ccgdm->dm, CD_ORIGINDEX);

	polyOrigIndex = DM_get_poly_data_layer(&ccgdm->dm, CD_ORIGINDEX);

#if 0
	/* this is not in trunk, can gives problems because colors initialize
	 * as black, just don't do it!, it works fine - campbell */
	if (!CustomData_has_layer(&ccgdm->dm.faceData, CD_MCOL))
		DM_add_tessface_layer(&ccgdm->dm, CD_MCOL, CD_CALLOC, NULL);
	mcol = DM_get_tessface_data_layer(&ccgdm->dm, CD_MCOL);
#endif

	has_edge_origindex = CustomData_has_layer(&ccgdm->dm.edgeData, CD_ORIGINDEX);


	loopindex = loopindex2 = 0; //current loop index
	for (index = 0; index < totface; index++) {
		CCGFace *f = ccgdm->faceMap[index].face;
		int numVerts = ccgSubSurf_getFaceNumVerts(f);
		int numFinalEdges = numVerts * (gridSideEdges + gridInternalEdges);
		int origIndex = GET_INT_FROM_POINTER(ccgSubSurf_getFaceFaceHandle(f));
		int g2_wid = gridCuts + 2;
		float *w2;
		int s, x, y;
		
		w = get_ss_weights(&wtable, gridCuts, numVerts);

		ccgdm->faceMap[index].startVert = vertNum;
		ccgdm->faceMap[index].startEdge = edgeNum;
		ccgdm->faceMap[index].startFace = faceNum;
		
		faceFlags->flag = mpoly ?  mpoly[origIndex].flag : 0;
		faceFlags->mat_nr = mpoly ? mpoly[origIndex].mat_nr : 0;
		faceFlags++;

		origIndex = base_polyOrigIndex ? base_polyOrigIndex[origIndex] : origIndex;

		/* set the face base vert */
		*((int *)ccgSubSurf_getFaceUserData(ss, f)) = vertNum;

		BLI_array_empty(loopidx);
		BLI_array_growitems(loopidx, numVerts);
		for (s = 0; s < numVerts; s++) {
			loopidx[s] = loopindex++;
		}
		
		BLI_array_empty(vertidx);
		BLI_array_growitems(vertidx, numVerts);
		for (s = 0; s < numVerts; s++) {
			CCGVert *v = ccgSubSurf_getFaceVert(f, s);
			vertidx[s] = GET_INT_FROM_POINTER(ccgSubSurf_getVertVertHandle(v));
		}
		

		/*I think this is for interpolating the center vert?*/
		w2 = w; // + numVerts*(g2_wid-1)*(g2_wid-1); //numVerts*((g2_wid-1)*g2_wid+g2_wid-1);
		DM_interp_vert_data(dm, &ccgdm->dm, vertidx, w2,
		                    numVerts, vertNum);
		if (vertOrigIndex) {
			*vertOrigIndex = ORIGINDEX_NONE;
			++vertOrigIndex;
		}

		++vertNum;

		/*interpolate per-vert data*/
		for (s = 0; s < numVerts; s++) {
			for (x = 1; x < gridFaces; x++) {
				w2 = w + s * numVerts * g2_wid * g2_wid + x * numVerts;
				DM_interp_vert_data(dm, &ccgdm->dm, vertidx, w2,
				                    numVerts, vertNum);

				if (vertOrigIndex) {
					*vertOrigIndex = ORIGINDEX_NONE;
					++vertOrigIndex;
				}

				++vertNum;
			}
		}

		/*interpolate per-vert data*/
		for (s = 0; s < numVerts; s++) {
			for (y = 1; y < gridFaces; y++) {
				for (x = 1; x < gridFaces; x++) {
					w2 = w + s * numVerts * g2_wid * g2_wid + (y * g2_wid + x) * numVerts;
					DM_interp_vert_data(dm, &ccgdm->dm, vertidx, w2,
					                    numVerts, vertNum);

					if (vertOrigIndex) {
						*vertOrigIndex = ORIGINDEX_NONE;
						++vertOrigIndex;
					}

					++vertNum;
				}
			}
		}

		if (has_edge_origindex) {
			for (i = 0; i < numFinalEdges; ++i)
				*(int *)DM_get_edge_data(&ccgdm->dm, edgeNum + i,
				                         CD_ORIGINDEX) = ORIGINDEX_NONE;
		}

		for (s = 0; s < numVerts; s++) {
			/*interpolate per-face data*/
			for (y = 0; y < gridFaces; y++) {
				for (x = 0; x < gridFaces; x++) {
					w2 = w + s * numVerts * g2_wid * g2_wid + (y * g2_wid + x) * numVerts;
					CustomData_interp(&dm->loopData, &ccgdm->dm.loopData,
					                  loopidx, w2, NULL, numVerts, loopindex2);
					loopindex2++;

					w2 = w + s * numVerts * g2_wid * g2_wid + ((y + 1) * g2_wid + (x)) * numVerts;
					CustomData_interp(&dm->loopData, &ccgdm->dm.loopData,
					                  loopidx, w2, NULL, numVerts, loopindex2);
					loopindex2++;

					w2 = w + s * numVerts * g2_wid * g2_wid + ((y + 1) * g2_wid + (x + 1)) * numVerts;
					CustomData_interp(&dm->loopData, &ccgdm->dm.loopData,
					                  loopidx, w2, NULL, numVerts, loopindex2);
					loopindex2++;
					
					w2 = w + s * numVerts * g2_wid * g2_wid + ((y) * g2_wid + (x + 1)) * numVerts;
					CustomData_interp(&dm->loopData, &ccgdm->dm.loopData,
					                  loopidx, w2, NULL, numVerts, loopindex2);
					loopindex2++;

					/*copy over poly data, e.g. mtexpoly*/
					CustomData_copy_data(&dm->polyData, &ccgdm->dm.polyData, origIndex, faceNum, 1);

					/*generate tessellated face data used for drawing*/
					ccg_loops_to_corners(&ccgdm->dm.faceData, &ccgdm->dm.loopData,
					                     &ccgdm->dm.polyData, loopindex2 - 4, faceNum, faceNum,
					                     numTex, numCol, hasPCol, hasOrigSpace);
					
					/*set original index data*/
					if (faceOrigIndex) {
						*faceOrigIndex = origIndex;
						faceOrigIndex++;
					}
					if (polyOrigIndex) {
						*polyOrigIndex = origIndex;
						polyOrigIndex++;
					}

					ccgdm->reverseFaceMap[faceNum] = index;

					/* This is a simple one to one mapping, here... */
					polyidx[faceNum] = faceNum;

					faceNum++;
				}
			}
		}

		edgeNum += numFinalEdges;
	}

	for (index = 0; index < totedge; ++index) {
		CCGEdge *e = ccgdm->edgeMap[index].edge;
		int numFinalEdges = edgeSize - 1;
		int mapIndex = ccgDM_getEdgeMapIndex(ss, e);
		int x;
		int vertIdx[2];
		int edgeIdx = GET_INT_FROM_POINTER(ccgSubSurf_getEdgeEdgeHandle(e));

		CCGVert *v;
		v = ccgSubSurf_getEdgeVert0(e);
		vertIdx[0] = GET_INT_FROM_POINTER(ccgSubSurf_getVertVertHandle(v));
		v = ccgSubSurf_getEdgeVert1(e);
		vertIdx[1] = GET_INT_FROM_POINTER(ccgSubSurf_getVertVertHandle(v));

		ccgdm->edgeMap[index].startVert = vertNum;
		ccgdm->edgeMap[index].startEdge = edgeNum;

		if (edgeIdx >= 0 && edgeFlags)
			edgeFlags[edgeIdx] = medge[edgeIdx].flag;

		/* set the edge base vert */
		*((int *)ccgSubSurf_getEdgeUserData(ss, e)) = vertNum;

		for (x = 1; x < edgeSize - 1; x++) {
			float w[2];
			w[1] = (float) x / (edgeSize - 1);
			w[0] = 1 - w[1];
			DM_interp_vert_data(dm, &ccgdm->dm, vertIdx, w, 2, vertNum);
			if (vertOrigIndex) {
				*vertOrigIndex = ORIGINDEX_NONE;
				++vertOrigIndex;
			}
			++vertNum;
		}

		for (i = 0; i < numFinalEdges; ++i) {
			if (has_edge_origindex) {
				*(int *)DM_get_edge_data(&ccgdm->dm, edgeNum + i, CD_ORIGINDEX) = mapIndex;
			}
		}

		edgeNum += numFinalEdges;
	}

	if (useSubsurfUv) {
		CustomData *ldata = &ccgdm->dm.loopData;
		CustomData *dmldata = &dm->loopData;
		int numlayer = CustomData_number_of_layers(ldata, CD_MLOOPUV);
		int dmnumlayer = CustomData_number_of_layers(dmldata, CD_MLOOPUV);

		for (i = 0; i < numlayer && i < dmnumlayer; i++)
			set_subsurf_uv(ss, dm, &ccgdm->dm, i);
	}

	for (index = 0; index < totvert; ++index) {
		CCGVert *v = ccgdm->vertMap[index].vert;
		int mapIndex = ccgDM_getVertMapIndex(ccgdm->ss, v);
		int vertIdx;

		vertIdx = GET_INT_FROM_POINTER(ccgSubSurf_getVertVertHandle(v));

		ccgdm->vertMap[index].startVert = vertNum;

		/* set the vert base vert */
		*((int *) ccgSubSurf_getVertUserData(ss, v)) = vertNum;

		DM_copy_vert_data(dm, &ccgdm->dm, vertIdx, vertNum, 1);

		if (vertOrigIndex) {
			*vertOrigIndex = mapIndex;
			++vertOrigIndex;
		}
		++vertNum;
	}

	ccgdm->dm.numVertData = vertNum;
	ccgdm->dm.numEdgeData = edgeNum;
	ccgdm->dm.numTessFaceData = faceNum;
	ccgdm->dm.numLoopData = loopindex2;
	ccgdm->dm.numPolyData = faceNum;

	/* All tessellated CD layers were updated! */
	ccgdm->dm.dirty &= ~DM_DIRTY_TESS_CDLAYERS;

	BLI_array_free(vertidx);
	BLI_array_free(loopidx);
	free_ss_weights(&wtable);

	return ccgdm;
}

/***/

struct DerivedMesh *subsurf_make_derived_from_derived(
        struct DerivedMesh *dm,
        struct SubsurfModifierData *smd,
        int useRenderParams, float (*vertCos)[3],
        int isFinalCalc, int forEditMode, int inEditMode)
{
	int useSimple = smd->subdivType == ME_SIMPLE_SUBSURF;
	CCGFlags useAging = smd->flags & eSubsurfModifierFlag_DebugIncr ? CCG_USE_AGING : 0;
	int useSubsurfUv = smd->flags & eSubsurfModifierFlag_SubsurfUv;
	int drawInteriorEdges = !(smd->flags & eSubsurfModifierFlag_ControlEdges);
	CCGDerivedMesh *result;

	if (forEditMode) {
		int levels = (smd->modifier.scene) ? get_render_subsurf_level(&smd->modifier.scene->r, smd->levels) : smd->levels;

		smd->emCache = _getSubSurf(smd->emCache, levels, useAging | CCG_CALC_NORMALS);
		ss_sync_from_derivedmesh(smd->emCache, dm, vertCos, useSimple);

		result = getCCGDerivedMesh(smd->emCache,
		                           drawInteriorEdges,
		                           useSubsurfUv, dm);
	}
	else if (useRenderParams) {
		/* Do not use cache in render mode. */
		CCGSubSurf *ss;
		int levels = (smd->modifier.scene) ? get_render_subsurf_level(&smd->modifier.scene->r, smd->renderLevels) : smd->renderLevels;

		if (levels == 0)
			return dm;
		
		ss = _getSubSurf(NULL, levels, CCG_USE_ARENA | CCG_CALC_NORMALS);

		ss_sync_from_derivedmesh(ss, dm, vertCos, useSimple);

		result = getCCGDerivedMesh(ss,
		                           drawInteriorEdges, useSubsurfUv, dm);

		result->freeSS = 1;
	}
	else {
		int useIncremental = (smd->flags & eSubsurfModifierFlag_Incremental);
		int levels = (smd->modifier.scene) ? get_render_subsurf_level(&smd->modifier.scene->r, smd->levels) : smd->levels;
		CCGSubSurf *ss;

		/* It is quite possible there is a much better place to do this. It
		 * depends a bit on how rigorously we expect this function to never
		 * be called in editmode. In semi-theory we could share a single
		 * cache, but the handles used inside and outside editmode are not
		 * the same so we would need some way of converting them. Its probably
		 * not worth the effort. But then why am I even writing this long
		 * comment that no one will read? Hmmm. - zr
		 *
		 * Addendum: we can't really ensure that this is never called in edit
		 * mode, so now we have a parameter to verify it. - brecht
		 */
		if (!inEditMode && smd->emCache) {
			ccgSubSurf_free(smd->emCache);
			smd->emCache = NULL;
		}

		if (useIncremental && isFinalCalc) {
			smd->mCache = ss = _getSubSurf(smd->mCache, levels, useAging | CCG_CALC_NORMALS);

			ss_sync_from_derivedmesh(ss, dm, vertCos, useSimple);

			result = getCCGDerivedMesh(smd->mCache,
			                           drawInteriorEdges,
			                           useSubsurfUv, dm);
		}
		else {
			if (smd->mCache && isFinalCalc) {
				ccgSubSurf_free(smd->mCache);
				smd->mCache = NULL;
			}

			ss = _getSubSurf(NULL, levels, CCG_USE_ARENA | CCG_CALC_NORMALS);
			ss_sync_from_derivedmesh(ss, dm, vertCos, useSimple);

			result = getCCGDerivedMesh(ss, drawInteriorEdges, useSubsurfUv, dm);

			if (isFinalCalc)
				smd->mCache = ss;
			else
				result->freeSS = 1;
		}
	}

	return (DerivedMesh *)result;
}

void subsurf_calculate_limit_positions(Mesh *me, float (*positions_r)[3]) 
{
	/* Finds the subsurf limit positions for the verts in a mesh 
	 * and puts them in an array of floats. Please note that the 
	 * calculated vert positions is incorrect for the verts 
	 * on the boundary of the mesh.
	 */
	CCGSubSurf *ss = _getSubSurf(NULL, 1, CCG_USE_ARENA);
	float edge_sum[3], face_sum[3];
	CCGVertIterator *vi;
	DerivedMesh *dm = CDDM_from_mesh(me, NULL);

	ss_sync_from_derivedmesh(ss, dm, NULL, 0);

	vi = ccgSubSurf_getVertIterator(ss);
	for (; !ccgVertIterator_isStopped(vi); ccgVertIterator_next(vi)) {
		CCGVert *v = ccgVertIterator_getCurrent(vi);
		int idx = GET_INT_FROM_POINTER(ccgSubSurf_getVertVertHandle(v));
		int N = ccgSubSurf_getVertNumEdges(v);
		int numFaces = ccgSubSurf_getVertNumFaces(v);
		float *co;
		int i;

		edge_sum[0] = edge_sum[1] = edge_sum[2] = 0.0;
		face_sum[0] = face_sum[1] = face_sum[2] = 0.0;

		for (i = 0; i < N; i++) {
			CCGEdge *e = ccgSubSurf_getVertEdge(v, i);
			add_v3_v3v3(edge_sum, edge_sum, ccgSubSurf_getEdgeData(ss, e, 1));
		}
		for (i = 0; i < numFaces; i++) {
			CCGFace *f = ccgSubSurf_getVertFace(v, i);
			add_v3_v3(face_sum, ccgSubSurf_getFaceCenterData(f));
		}

		/* ad-hoc correction for boundary vertices, to at least avoid them
		 * moving completely out of place (brecht) */
		if (numFaces && numFaces != N)
			mul_v3_fl(face_sum, (float)N / (float)numFaces);

		co = ccgSubSurf_getVertData(ss, v);
		positions_r[idx][0] = (co[0] * N * N + edge_sum[0] * 4 + face_sum[0]) / (N * (N + 5));
		positions_r[idx][1] = (co[1] * N * N + edge_sum[1] * 4 + face_sum[1]) / (N * (N + 5));
		positions_r[idx][2] = (co[2] * N * N + edge_sum[2] * 4 + face_sum[2]) / (N * (N + 5));
	}
	ccgVertIterator_free(vi);

	ccgSubSurf_free(ss);

	dm->release(dm);
}