/*
===========================================================================
Copyright (C) 1997-2006 Id Software, Inc.

This file is part of Quake 2 Tools source code.

Quake 2 Tools source code 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.

Quake 2 Tools source code 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 Quake 2 Tools source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

#include "cmdlib.h"
#include "mathlib.h"
#include "scriplib.h"
#include "polylib.h"
#include "threads.h"
#include "bspfile.h"

#define	MAX_BRUSH_SIDES	128
#define	CLIP_EPSILON	0.1

#define	BOGUS_RANGE	8192

#define	TEXINFO_NODE		-1		// side is allready on a node

typedef struct plane_s
{
	vec3_t	normal;
	vec_t	dist;
	int		type;
	struct plane_s	*hash_chain;
} plane_t;

typedef struct
{
	vec_t	shift[2];
	vec_t	rotate;
	vec_t	scale[2];
	char	name[32];
	int		flags;
	int		value;
} brush_texture_t;

typedef struct side_s
{
	int			planenum;
	int			texinfo;
	winding_t	*winding;
	struct side_s	*original;	// bspbrush_t sides will reference the mapbrush_t sides
	int			contents;		// from miptex
	int			surf;			// from miptex
	qboolean	visible;		// choose visble planes first
	qboolean	tested;			// this plane allready checked as a split
	qboolean	bevel;			// don't ever use for bsp splitting
} side_t;

typedef struct brush_s
{
	int		entitynum;
	int		brushnum;

	int		contents;

	vec3_t	mins, maxs;

	int		numsides;
	side_t	*original_sides;
} mapbrush_t;

#define	PLANENUM_LEAF			-1

#define	MAXEDGES		20

typedef struct face_s
{
	struct face_s	*next;		// on node

	// the chain of faces off of a node can be merged or split,
	// but each face_t along the way will remain in the chain
	// until the entire tree is freed
	struct face_s	*merged;	// if set, this face isn't valid anymore
	struct face_s	*split[2];	// if set, this face isn't valid anymore

	struct portal_s	*portal;
	int				texinfo;
	int				planenum;
	int				contents;	// faces in different contents can't merge
	int				outputnumber;
	winding_t		*w;
	int				numpoints;
	qboolean		badstartvert;	// tjunctions cannot be fixed without a midpoint vertex
	int				vertexnums[MAXEDGES];
} face_t;



typedef struct bspbrush_s
{
	struct bspbrush_s	*next;
	vec3_t	mins, maxs;
	int		side, testside;		// side of node during construction
	mapbrush_t	*original;
	int		numsides;
	side_t	sides[6];			// variably sized
} bspbrush_t;



#define	MAX_NODE_BRUSHES	8
typedef struct node_s
{
	// both leafs and nodes
	int				planenum;	// -1 = leaf node
	struct node_s	*parent;
	vec3_t			mins, maxs;	// valid after portalization
	bspbrush_t		*volume;	// one for each leaf/node

	// nodes only
	qboolean		detail_seperator;	// a detail brush caused the split
	side_t			*side;		// the side that created the node
	struct node_s	*children[2];
	face_t			*faces;

	// leafs only
	bspbrush_t		*brushlist;	// fragments of all brushes in this leaf
	int				contents;	// OR of all brush contents
	int				occupied;	// 1 or greater can reach entity
	entity_t		*occupant;	// for leak file testing
	int				cluster;	// for portalfile writing
	int				area;		// for areaportals
	struct portal_s	*portals;	// also on nodes during construction
} node_t;

typedef struct portal_s
{
	plane_t		plane;
	node_t		*onnode;		// NULL = outside box
	node_t		*nodes[2];		// [0] = front side of plane
	struct portal_s	*next[2];
	winding_t	*winding;

	qboolean	sidefound;		// false if ->side hasn't been checked
	side_t		*side;			// NULL = non-visible
	face_t		*face[2];		// output face in bsp file
} portal_t;

typedef struct
{
	node_t		*headnode;
	node_t		outside_node;
	vec3_t		mins, maxs;
} tree_t;

extern	int			entity_num;

extern	plane_t		mapplanes[MAX_MAP_PLANES];
extern	int			nummapplanes;

extern	int			nummapbrushes;
extern	mapbrush_t	mapbrushes[MAX_MAP_BRUSHES];

extern	vec3_t		map_mins, map_maxs;

#define	MAX_MAP_SIDES		(MAX_MAP_BRUSHES*6)

extern	int			nummapbrushsides;
extern	side_t		brushsides[MAX_MAP_SIDES];

extern	qboolean	noprune;
extern	qboolean	nodetail;
extern	qboolean	fulldetail;
extern	qboolean	nomerge;
extern	qboolean	nosubdiv;
extern	qboolean	nowater;
extern	qboolean	noweld;
extern	qboolean	noshare;
extern	qboolean	notjunc;

extern	vec_t		microvolume;

extern	char		outbase[32];

extern	char	source[1024];

void 	LoadMapFile (char *filename);
int		FindFloatPlane (vec3_t normal, vec_t dist);

//=============================================================================

// textures.c

typedef struct
{
	char	name[64];
	int		flags;
	int		value;
	int		contents;
	char	animname[64];
} textureref_t;

#define	MAX_MAP_TEXTURES	1024

extern	textureref_t	textureref[MAX_MAP_TEXTURES];

int	FindMiptex (char *name);

int TexinfoForBrushTexture (plane_t *plane, brush_texture_t *bt, vec3_t origin);

//=============================================================================

void FindGCD (int *v);

mapbrush_t *Brush_LoadEntity (entity_t *ent);
int	PlaneTypeForNormal (vec3_t normal);
qboolean MakeBrushPlanes (mapbrush_t *b);
int		FindIntPlane (int *inormal, int *iorigin);
void	CreateBrush (int brushnum);


//=============================================================================

// draw.c

extern vec3_t	draw_mins, draw_maxs;
extern	qboolean	drawflag;

void Draw_ClearWindow (void);
void DrawWinding (winding_t *w);

void GLS_BeginScene (void);
void GLS_Winding (winding_t *w, int code);
void GLS_EndScene (void);

//=============================================================================

// csg

bspbrush_t *MakeBspBrushList (int startbrush, int endbrush,
		vec3_t clipmins, vec3_t clipmaxs);
bspbrush_t *ChopBrushes (bspbrush_t *head);
bspbrush_t *InitialBrushList (bspbrush_t *list);
bspbrush_t *OptimizedBrushList (bspbrush_t *list);

void WriteBrushMap (char *name, bspbrush_t *list);

//=============================================================================

// brushbsp

void WriteBrushList (char *name, bspbrush_t *brush, qboolean onlyvis);

bspbrush_t *CopyBrush (bspbrush_t *brush);

void SplitBrush (bspbrush_t *brush, int planenum,
	bspbrush_t **front, bspbrush_t **back);

tree_t *AllocTree (void);
node_t *AllocNode (void);
bspbrush_t *AllocBrush (int numsides);
int	CountBrushList (bspbrush_t *brushes);
void FreeBrush (bspbrush_t *brushes);
vec_t BrushVolume (bspbrush_t *brush);

void BoundBrush (bspbrush_t *brush);
void FreeBrushList (bspbrush_t *brushes);

tree_t *BrushBSP (bspbrush_t *brushlist, vec3_t mins, vec3_t maxs);

//=============================================================================

// portals.c

int VisibleContents (int contents);

void MakeHeadnodePortals (tree_t *tree);
void MakeNodePortal (node_t *node);
void SplitNodePortals (node_t *node);

qboolean	Portal_VisFlood (portal_t *p);

qboolean FloodEntities (tree_t *tree);
void FillOutside (node_t *headnode);
void FloodAreas (tree_t *tree);
void MarkVisibleSides (tree_t *tree, int start, int end);
void FreePortal (portal_t *p);
void EmitAreaPortals (node_t *headnode);

void MakeTreePortals (tree_t *tree);

//=============================================================================

// glfile.c

void OutputWinding (winding_t *w, FILE *glview);
void WriteGLView (tree_t *tree, char *source);

//=============================================================================

// leakfile.c

void LeakFile (tree_t *tree);

//=============================================================================

// prtfile.c

void WritePortalFile (tree_t *tree);

//=============================================================================

// writebsp.c

void SetModelNumbers (void);
void SetLightStyles (void);

void BeginBSPFile (void);
void WriteBSP (node_t *headnode);
void EndBSPFile (void);
void BeginModel (void);
void EndModel (void);

//=============================================================================

// faces.c

void MakeFaces (node_t *headnode);
void FixTjuncs (node_t *headnode);
int GetEdge2 (int v1, int v2,  face_t *f);

face_t	*AllocFace (void);
void FreeFace (face_t *f);

void MergeNodeFaces (node_t *node);

//=============================================================================

// tree.c

void FreeTree (tree_t *tree);
void FreeTree_r (node_t *node);
void PrintTree_r (node_t *node, int depth);
void FreeTreePortals_r (node_t *node);
void PruneNodes_r (node_t *node);
void PruneNodes (node_t *node);
