/*
 * Copyright (C) 1997-2001 Id Software, Inc.
 * Copyright (C) 2018-2019 Krzysztof Kondrak
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * =======================================================================
 *
 * Header for the model stuff.
 *
 * =======================================================================
 */

#ifndef __VK_MODEL_H__
#define __VK_MODEL_H__

/*

d*_t structures are on-disk representations
m*_t structures are in-memory

*/

/*
==============================================================================

BRUSH MODELS

==============================================================================
*/


//
// in memory representation
//

#define	VERTEXSIZE	7
#define	DEFAULT_LMSHIFT		4

typedef struct vkpoly_s
{
	struct	vkpoly_s	*next;
	struct	vkpoly_s	*chain;
	int		numverts;
	int		flags;			// for SURF_UNDERWATER (not needed anymore?)
	float	verts[4][VERTEXSIZE];	// variable sized (xyz s1t1 s2t2)
} vkpoly_t;

typedef struct msurface_s
{
	int			visframe;		// should be drawn when node is crossed

	cplane_t	*plane;
	int			flags;

	int			firstedge;	// look up in model->surfedges[], negative numbers
	int			numedges;	// are backwards edges

	short		texturemins[2];
	short		extents[2];
	short		lmshift;

	int			light_s, light_t;	// gl lightmap coordinates
	int			dlight_s, dlight_t; // gl lightmap coordinates for dynamic lightmaps

	vkpoly_t	*polys;				// multiple if warped
	struct	msurface_s	*texturechain;
	struct  msurface_s	*lightmapchain;

	mtexinfo_t	*texinfo;

	/* decoupled lm */
	float	lmvecs[2][4];
	float	lmvlen[2];

	/* lighting info */
	int			dlightframe;
	int			dlightbits;

	int			lightmaptexturenum;
	byte		styles[MAXLIGHTMAPS];
	float		cached_light[MAXLIGHTMAPS];	// values currently used in lightmap
	byte		*samples;		// [numstyles*surfsize]
} msurface_t;

/* Whole model */

typedef struct model_s
{
	char		name[MAX_QPATH];

	int			registration_sequence;

	modtype_t	type;
	int			numframes;

	int			flags;

//
// volume occupied by the model graphics
//
	vec3_t		mins, maxs;
	float		radius;

//
// solid volume for clipping
//
	qboolean	clipbox;
	vec3_t		clipmins, clipmaxs;

//
// brush model
//
	int			firstmodelsurface, nummodelsurfaces;
	int			lightmap;		// only for submodels

	int			numsubmodels;
	struct model_s	*submodels;

	int			numplanes;
	cplane_t	*planes;

	int			numleafs;		// number of visible leafs, not counting 0
	mleaf_t		*leafs;

	int			numvertexes;
	mvertex_t	*vertexes;

	int			numedges;
	medge_t		*edges;

	int			numnodes;
	int			firstnode;
	mnode_t		*nodes;

	int			numtexinfo;
	mtexinfo_t	*texinfo;

	int			numsurfaces;
	msurface_t	*surfaces;

	int			numsurfedges;
	int			*surfedges;

	int			nummarksurfaces;
	msurface_t	**marksurfaces;

	dvis_t		*vis;

	byte		*lightdata;

	// for alias models and skins
	image_t		*skins[MAX_MD2SKINS];

	int			extradatasize;
	void		*extradata;

	// submodules
	vec3_t		origin;	// for sounds or lights
} model_t;

void Mod_Init(void);
const byte *Mod_ClusterPVS(int cluster, const model_t *model);

void Mod_Modellist_f(void);

void *Hunk_Begin(int maxsize);
void *Hunk_Alloc(int size);
int Hunk_End(void);
void Hunk_Free(void *base);

void Mod_FreeAll(void);
void	Mod_FreeModelsKnown (void);

#endif
