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

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.
===========================================================================
*/

#include "cmdlib.h"
#include "mathlib.h"
#include "bspfile.h"

#define	MAX_PORTALS	32768

#define	PORTALFILE	"PRT1"

#define	ON_EPSILON	0.1

typedef struct
{
	vec3_t		normal;
	float		dist;
} plane_t;

#define MAX_POINTS_ON_WINDING	64
#define	MAX_POINTS_ON_FIXED_WINDING	12

typedef struct
{
	qboolean	original;			// don't free, it's part of the portal
	int		numpoints;
	vec3_t	points[MAX_POINTS_ON_FIXED_WINDING];			// variable sized
} winding_t;

winding_t	*NewWinding (int points);
void		FreeWinding (winding_t *w);
winding_t	*CopyWinding (winding_t *w);


typedef enum {stat_none, stat_working, stat_done} vstatus_t;
typedef struct
{
	plane_t		plane;	// normal pointing into neighbor
	int			leaf;	// neighbor

	vec3_t		origin;	// for fast clip testing
	float		radius;

	winding_t	*winding;
	vstatus_t	status;
	byte		*portalfront;	// [portals], preliminary
	byte		*portalflood;	// [portals], intermediate
	byte		*portalvis;		// [portals], final

	int			nummightsee;	// bit count on portalflood for sort
} portal_t;

typedef struct seperating_plane_s
{
	struct seperating_plane_s *next;
	plane_t		plane;		// from portal is on positive side
} sep_t;


typedef struct passage_s
{
	struct passage_s	*next;
	int			from, to;		// leaf numbers
	sep_t				*planes;
} passage_t;

#define	MAX_PORTALS_ON_LEAF		128
typedef struct leaf_s
{
	int			numportals;
	passage_t	*passages;
	portal_t	*portals[MAX_PORTALS_ON_LEAF];
} leaf_t;


typedef struct pstack_s
{
	byte		mightsee[MAX_PORTALS/8];		// bit string
	struct pstack_s	*next;
	leaf_t		*leaf;
	portal_t	*portal;	// portal exiting
	winding_t	*source;
	winding_t	*pass;

	winding_t	windings[3];	// source, pass, temp in any order
	int			freewindings[3];

	plane_t		portalplane;
} pstack_t;

typedef struct
{
	portal_t	*base;
	int			c_chains;
	pstack_t	pstack_head;
} threaddata_t;



extern	int			numportals;
extern	int			portalclusters;

extern	portal_t	*portals;
extern	leaf_t		*leafs;

extern	int			c_portaltest, c_portalpass, c_portalcheck;
extern	int			c_portalskip, c_leafskip;
extern	int			c_vistest, c_mighttest;
extern	int			c_chains;

extern	byte	*vismap, *vismap_p, *vismap_end;	// past visfile

extern	byte		*uncompressed;

extern	int		leafbytes, leaflongs;
extern	int		portalbytes, portallongs;


void LeafFlow (int leafnum);


void BasePortalVis (int portalnum);
void BetterPortalVis (int portalnum);
void PortalFlow (int portalnum);

extern	portal_t	*sorted_portals[MAX_MAP_PORTALS*2];

int CountBits (byte *bits, int numbits);
