/*
 * ***** 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) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */
#ifndef __BKE_SUBSURF_H__
#define __BKE_SUBSURF_H__

/** \file BKE_subsurf.h
 *  \ingroup bke
 */

/* struct DerivedMesh is used directly */
#include "BKE_DerivedMesh.h"

struct CCGElem;
struct DMFlagMat;
struct DMGridAdjacency;
struct DerivedMesh;
struct MeshElemMap;
struct Mesh;
struct MPoly;
struct Object;
struct PBVH;
struct SubsurfModifierData;
struct CCGEdge;
struct CCGFace;
struct CCGVert;
struct EdgeHash;
struct PBVH;

/**************************** External *****************************/

typedef enum {
	SUBSURF_USE_RENDER_PARAMS = 1,
	SUBSURF_IS_FINAL_CALC = 2,
	SUBSURF_FOR_EDIT_MODE = 4,
	SUBSURF_IN_EDIT_MODE = 8,
	SUBSURF_ALLOC_PAINT_MASK = 16,
	SUBSURF_USE_GPU_BACKEND = 32,
} SubsurfFlags;

struct DerivedMesh *subsurf_make_derived_from_derived(
        struct DerivedMesh *dm,
        struct SubsurfModifierData *smd,
        float (*vertCos)[3],
        SubsurfFlags flags);

void subsurf_calculate_limit_positions(struct Mesh *me, float (*r_positions)[3]);

/* get gridsize from 'level', level must be greater than zero */
int BKE_ccg_gridsize(int level);

/* x/y grid coordinates at 'low_level' can be multiplied by the result
 * of this function to convert to grid coordinates at 'high_level' */
int BKE_ccg_factor(int low_level, int high_level);

void subsurf_copy_grid_hidden(struct DerivedMesh *dm,
                              const struct MPoly *mpoly,
                              struct MVert *mvert,
                              const struct MDisps *mdisps);

void subsurf_copy_grid_paint_mask(struct DerivedMesh *dm,
                                  const struct MPoly *mpoly, float *paint_mask,
                                  const struct GridPaintMask *grid_paint_mask);

bool subsurf_has_edges(struct DerivedMesh *dm);
bool subsurf_has_faces(struct DerivedMesh *dm);

typedef enum MultiresModifiedFlags {
	/* indicates the grids have been sculpted on, so MDisps
	 * have to be updated */
	MULTIRES_COORDS_MODIFIED = 1,
	/* indicates elements have been hidden or unhidden */
	MULTIRES_HIDDEN_MODIFIED = 2
} MultiresModifiedFlags;

/**************************** Internal *****************************/

typedef struct CCGDerivedMesh {
	DerivedMesh dm;

	struct CCGSubSurf *ss;
	int freeSS;
	int drawInteriorEdges, useSubsurfUv, useGpuBackend;

	struct {int startVert; struct CCGVert *vert; } *vertMap;
	struct {int startVert; int startEdge; struct CCGEdge *edge; } *edgeMap;
	struct {int startVert; int startEdge;
		    int startFace; struct CCGFace *face; } *faceMap;

	short *edgeFlags;
	struct DMFlagMat *faceFlags;

	int *reverseFaceMap;

	struct PBVH *pbvh;

	struct MeshElemMap *pmap;
	int *pmap_mem;

	struct CCGElem **gridData;
	int *gridOffset;
	struct CCGFace **gridFaces;
	struct DMFlagMat *gridFlagMats;
	unsigned int **gridHidden;
	/* Elements in arrays above. */
	unsigned int numGrid;

	struct {
		struct MultiresModifierData *mmd;
		int local_mmd;

		int lvl, totlvl;
		float (*orco)[3];

		struct Object *ob;
		MultiresModifiedFlags modified_flags;
	} multires;

	struct EdgeHash *ehash;
} CCGDerivedMesh;

#ifdef WITH_OPENSUBDIV
/* TODO(sergey): Not really ideal place, but we don't currently have better one. */
void BKE_subsurf_osd_init(void);
void BKE_subsurf_free_unused_buffers(void);
void BKE_subsurf_osd_cleanup(void);
#endif

#endif