// Emacs style mode select   -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// DESCRIPTION:
//	Do all the WAD I/O, get map description,
//	set up initial state and misc. LUTs.
//
//-----------------------------------------------------------------------------

static const char
rcsid[] = "$Id: p_setup.c,v 1.5 1997/02/03 22:45:12 b1 Exp $";


#include <math.h>

#include "z_zone.h"

#include "m_swap.h"
#include "m_bbox.h"

#include "g_game.h"

#include "i_system.h"
#include "w_wad.h"

#include "doomdef.h"
#include "p_local.h"

#include "s_sound.h"

#include "doomstat.h"

char MsgText[256];
void WriteDebug(char *);

void	P_SpawnMapThing (mapthing_t*	mthing);

//
// MAP related Lookup tables.
// Store VERTEXES, LINEDEFS, SIDEDEFS, etc.
//
int		numvertexes;
vertex_t*	vertexes;

int		numsegs;
seg_t*		segs;

int		numsectors;
sector_t*	sectors;

int		numsubsectors;
subsector_t*	subsectors;

int		numnodes;
node_t*		nodes;

int		numlines;
line_t*		lines;

int		numsides;
side_t*		sides;


// BLOCKMAP
// Created from axis aligned bounding box
// of the map, a rectangular array of
// blocks of size ...
// Used to speed up collision detection
// by spatial subdivision in 2D.
//
// Blockmap size.
int		bmapwidth;
int		bmapheight;	// size in mapblocks
short*		blockmap;	// int for larger maps
// offsets in blockmap are from here
short*		blockmaplump;		
// origin of block map
fixed_t		bmaporgx;
fixed_t		bmaporgy;
// for thing chains
mobj_t**	blocklinks;		


// REJECT
// For fast sight rejection.
// Speeds up enemy AI by skipping detailed
//  LineOf Sight calculation.
// Without special effect, this could be
//  used as a PVS lookup as well.
//
byte*		rejectmatrix;


// Maintain single and multi player starting spots.
#define MAX_DEATHMATCH_STARTS	10

mapthing_t	deathmatchstarts[MAX_DEATHMATCH_STARTS];
mapthing_t*	deathmatch_p;
mapthing_t	playerstarts[MAXPLAYERS];





//
// P_LoadVertexes
//
void P_LoadVertexes (int lump)
{
    byte*		data;
    int			i;
    mapvertex_t*	ml;
    vertex_t*		li;

    // Determine number of lumps:
    //  total lump length / vertex record length.
    numvertexes = W_LumpLength (lump) / sizeof(mapvertex_t);

    // Allocate zone memory for buffer.
    vertexes = Z_Malloc (numvertexes*sizeof(vertex_t),PU_LEVEL,0);	

    // Load data into cache.
    data = W_CacheLumpNum (lump,PU_STATIC);
	
    ml = (mapvertex_t *)data;
    li = vertexes;

    // Copy and convert vertex coordinates,
    // internal representation as fixed.
    for (i=0 ; i<numvertexes ; i++, li++, ml++)
    {
	li->x = SHORT(ml->x)<<FRACBITS;
	li->y = SHORT(ml->y)<<FRACBITS;
    }

    // Free buffer memory.
    Z_Free (data);
}



//
// P_LoadSegs
//
void P_LoadSegs (int lump)
{
    byte*		data;
    int			i;
    mapseg_t*		ml;
    seg_t*		li;
    line_t*		ldef;
    int			linedef;
    int			side;
	
    numsegs = W_LumpLength (lump) / sizeof(mapseg_t);
    segs = Z_Malloc (numsegs*sizeof(seg_t),PU_LEVEL,0);	
    memset (segs, 0, numsegs*sizeof(seg_t));
    data = W_CacheLumpNum (lump,PU_STATIC);
	
    ml = (mapseg_t *)data;
    li = segs;
    for (i=0 ; i<numsegs ; i++, li++, ml++)
    {
	li->v1 = &vertexes[SHORT(ml->v1)];
	li->v2 = &vertexes[SHORT(ml->v2)];
					
	li->angle = (SHORT(ml->angle))<<16;
	li->offset = (SHORT(ml->offset))<<16;
	linedef = SHORT(ml->linedef);
	ldef = &lines[linedef];
	li->linedef = ldef;
	side = SHORT(ml->side);
	li->sidedef = &sides[ldef->sidenum[side]];
	li->frontsector = sides[ldef->sidenum[side]].sector;
	if (ldef-> flags & ML_TWOSIDED)
	    li->backsector = sides[ldef->sidenum[side^1]].sector;
	else
	    li->backsector = 0;
    }
	
    Z_Free (data);
}


//
// P_LoadSubsectors
//
void P_LoadSubsectors (int lump)
{
    byte*		data;
    int			i;
    mapsubsector_t*	ms;
    subsector_t*	ss;
	
    numsubsectors = W_LumpLength (lump) / sizeof(mapsubsector_t);
    subsectors = Z_Malloc (numsubsectors*sizeof(subsector_t),PU_LEVEL,0);	
    data = W_CacheLumpNum (lump,PU_STATIC);
	
    ms = (mapsubsector_t *)data;
    memset (subsectors,0, numsubsectors*sizeof(subsector_t));
    ss = subsectors;
    
    for (i=0 ; i<numsubsectors ; i++, ss++, ms++)
    {
	ss->numlines = SHORT(ms->numsegs);
	ss->firstline = SHORT(ms->firstseg);
    }
	
    Z_Free (data);
}



//
// P_LoadSectors
//
void P_LoadSectors (int lump)
{
    byte*		data;
    int			i;
    mapsector_t*	ms;
    sector_t*		ss;
	
    numsectors = W_LumpLength (lump) / sizeof(mapsector_t);
    sectors = Z_Malloc (numsectors*sizeof(sector_t),PU_LEVEL,0);	
    memset (sectors, 0, numsectors*sizeof(sector_t));
    data = W_CacheLumpNum (lump,PU_STATIC);
	
    ms = (mapsector_t *)data;
    ss = sectors;
    for (i=0 ; i<numsectors ; i++, ss++, ms++)
    {
	ss->floorheight = SHORT(ms->floorheight)<<FRACBITS;
	ss->ceilingheight = SHORT(ms->ceilingheight)<<FRACBITS;
	ss->floorpic = R_FlatNumForName(ms->floorpic);
	ss->ceilingpic = R_FlatNumForName(ms->ceilingpic);
	ss->lightlevel = SHORT(ms->lightlevel);
	ss->special = SHORT(ms->special);
	ss->tag = SHORT(ms->tag);
	ss->thinglist = NULL;
    }
	
    Z_Free (data);
}


//
// P_LoadNodes
//
void P_LoadNodes (int lump)
{
    byte*	data;
    int		i;
    int		j;
    int		k;
    mapnode_t*	mn;
    node_t*	no;
	
    numnodes = W_LumpLength (lump) / sizeof(mapnode_t);
    nodes = Z_Malloc (numnodes*sizeof(node_t),PU_LEVEL,0);	
    data = W_CacheLumpNum (lump,PU_STATIC);
	
    mn = (mapnode_t *)data;
    no = nodes;
    
    for (i=0 ; i<numnodes ; i++, no++, mn++)
    {
	no->x = SHORT(mn->x)<<FRACBITS;
	no->y = SHORT(mn->y)<<FRACBITS;
	no->dx = SHORT(mn->dx)<<FRACBITS;
	no->dy = SHORT(mn->dy)<<FRACBITS;
	for (j=0 ; j<2 ; j++)
	{
	    no->children[j] = SHORT(mn->children[j]);
	    for (k=0 ; k<4 ; k++)
		no->bbox[j][k] = SHORT(mn->bbox[j][k])<<FRACBITS;
	}
    }
	
    Z_Free (data);
}


//
// P_LoadThings
//
void P_LoadThings (int lump)
   {
    byte*		data;
    int			i;
    mapthing_t*		mt;
    int			numthings;
    boolean		spawn;

    data = W_CacheLumpNum (lump,PU_STATIC);
    numthings = W_LumpLength (lump) / sizeof(mapthing_t);
	
    mt = (mapthing_t *)data;
    for (i=0 ; i<numthings ; i++, mt++)
       {
        spawn = true;

        // Do not spawn cool, new monsters if !commercial
        if ( gamemode != commercial)
           {
            switch(mt->type)
               {
                case 68:	// Arachnotron
                case 64:	// Archvile
                case 88:	// Boss Brain
                case 89:	// Boss Shooter
                case 69:	// Hell Knight
                case 67:	// Mancubus
                case 71:	// Pain Elemental
                case 65:	// Former Human Commando
                case 66:	// Revenant
                case 84:	// Wolf SS
                     spawn = false;
                     break;
               }
           }
        if (spawn == false)
            break;

        // Do spawn all other stuff. 
        mt->x = SHORT(mt->x);
        mt->y = SHORT(mt->y);
        mt->angle = SHORT(mt->angle);
        mt->type = SHORT(mt->type);
        mt->options = SHORT(mt->options);
	
        P_SpawnMapThing (mt);
       }
	
    Z_Free (data);
   }


//
// P_LoadLineDefs
// Also counts secret lines for intermissions.
//