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// Emacs style mode select   -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005 Simon Howard
//
// 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.
//
// DESCRIPTION:
//	Do all the WAD I/O, get map description,
//	set up initial state and misc. LUTs.
//
//-----------------------------------------------------------------------------



#include <math.h>

#include "z_zone.h"

#include "deh_main.h"
#include "i_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"


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];

// haleyjd 08/24/10: [STRIFE] rift spots for player spawning
mapthing_t      riftSpots[MAXRIFTSPOTS];




//
// 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.
    W_ReleaseLumpNum(lump);
}



//
// P_LoadSegs
//
void P_LoadSegs (int lump)
{
    byte*		data;
    int			i;
    mapseg_t*		ml;
    seg_t*		li;
    line_t*		ldef;
    int			linedef;
    int			side;
    int                 sidenum;
	
    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)
        {
            sidenum = ldef->sidenum[side ^ 1];

            // If the sidenum is out of range, this may be a "glass hack"
            // impassible window.  Point at side #0 (this may not be
            // the correct Vanilla behavior; however, it seems to work for
            // OTTAWAU.WAD, which is the one place I've seen this trick
            // used).

            if (sidenum < 0 || sidenum >= numsides)
            {
                sidenum = 0;
            }

            li->backsector = sides[sidenum].sector;
        }
        else
        {
	    li->backsector = 0;
        }
    }
	
    W_ReleaseLumpNum(lump);
}


//
// 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);
    }
	
    W_ReleaseLumpNum(lump);
}



//
// 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;
    }
	
    W_ReleaseLumpNum(lump);
}


//
// 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;
	}
    }
	
    W_ReleaseLumpNum(lump);
}


//
// P_LoadThings
//
// haleyjd 08/24/10: [STRIFE]:
// * Added code to record rift spots
void P_LoadThings (int lump)
{
    byte               *data;
    int			i;
    mapthing_t         *mt;
    mapthing_t          spawnthing;
    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
        // STRIFE-TODO: replace with isregistered stuff
        if (gamemode != commercial)
        {
            switch (SHORT(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. 
        spawnthing.x = SHORT(mt->x);
        spawnthing.y = SHORT(mt->y);
        spawnthing.angle = SHORT(mt->angle);
        spawnthing.type = SHORT(mt->type);
        spawnthing.options = SHORT(mt->options);

        // haleyjd 08/24/2010: Special Strife checks
        if(spawnthing.type >= 118 && spawnthing.type < 128)
        {
            // initialize riftSpots
            int riftSpotNum = spawnthing.type - 118;
            riftSpots[riftSpotNum] = spawnthing;
            riftSpots[riftSpotNum].type = 1;
        }
        else if(spawnthing.type >= 9001 && spawnthing.type < 9011)
        {
            // STRIFE-TODO: mystery array of 90xx objects
        }
        else
            P_SpawnMapThing(&spawnthing);
    }

    W_ReleaseLumpNum(lump);
}


//
// P_LoadLineDefs
// Also counts secret lines for intermissions.
//
void P_LoadLineDefs (int lump)
{
    byte*		data;
    int			i;
    maplinedef_t*	mld;
    line_t*		ld;
    vertex_t*		v1;
    vertex_t*		v2;
	
    numlines = W_LumpLength (lump) / sizeof(maplinedef_t);
    lines = Z_Malloc (numlines*sizeof(line_t),PU_LEVEL,0);	
    memset (lines, 0, numlines*sizeof(line_t));
    data = W_CacheLumpNum (lump,PU_STATIC);
	
    mld = (maplinedef_t *)data;
    ld = lines;
    for (i=0 ; i<numlines ; i++, mld++, ld++)
    {
	ld->flags = SHORT(mld->flags);
	ld->special = SHORT(mld->special);
	ld->tag = SHORT(mld->tag);
	v1 = ld->v1 = &vertexes[SHORT(mld->v1)];
	v2 = ld->v2 = &vertexes[SHORT(mld->v2)];
	ld->dx = v2->x - v1->x;
	ld->dy = v2->y - v1->y;
	
	if (!ld->dx)
	    ld->slopetype = ST_VERTICAL;
	else if (!ld->dy)
	    ld->slopetype = ST_HORIZONTAL;
	else
	{
	    if (FixedDiv (ld->dy , ld->dx) > 0)
		ld->slopetype = ST_POSITIVE;
	    else
		ld->slopetype = ST_NEGATIVE;
	}
		
	if (v1->x < v2->x)
	{
	    ld->bbox[BOXLEFT] = v1->x;
	    ld->bbox[BOXRIGHT] = v2->x;
	}
	else
	{
	    ld->bbox[BOXLEFT] = v2->x;
	    ld->bbox[BOXRIGHT] = v1->x;
	}

	if (v1->y < v2->y)
	{
	    ld->bbox[BOXBOTTOM] = v1->y;
	    ld->bbox[BOXTOP] = v2->y;
	}
	else
	{
	    ld->bbox[BOXBOTTOM] = v2->y;
	    ld->bbox[BOXTOP] = v1->y;
	}

	ld->sidenum[0] = SHORT(mld->sidenum[0]);
	ld->sidenum[1] = SHORT(mld->sidenum[1]);

	if (ld->sidenum[0] != -1)
	    ld->frontsector = sides[ld->sidenum[0]].sector;
	else
	    ld->frontsector = 0;

	if (ld->sidenum[1] != -1)
	    ld->backsector = sides[ld->sidenum[1]].sector;
	else
	    ld->backsector = 0;
    }

    W_ReleaseLumpNum(lump);
}


//
// P_LoadSideDefs
//
void P_LoadSideDefs (int lump)
{
    byte*		data;
    int			i;
    mapsidedef_t*	msd;
    side_t*		sd;
	
    numsides = W_LumpLength (lump) / sizeof(mapsidedef_t);
    sides = Z_Malloc (numsides*sizeof(side_t),PU_LEVEL,0);	
    memset (sides, 0, numsides*sizeof(side_t));
    data = W_CacheLumpNum (lump,PU_STATIC);
	
    msd = (mapsidedef_t *)data;
    sd = sides;
    for (i=0 ; i<numsides ; i++, msd++, sd++)
    {
	sd->textureoffset = SHORT(msd->textureoffset)<<FRACBITS;
	sd->rowoffset = SHORT(msd->rowoffset)<<FRACBITS;
	sd->toptexture = R_TextureNumForName(msd->toptexture);
	sd->bottomtexture = R_TextureNumForName(msd->bottomtexture);
	sd->midtexture = R_TextureNumForName(msd->midtexture);
	sd->sector = &sectors[SHORT(msd->sector)];
    }

    W_ReleaseLumpNum(lump);
}


//
// P_LoadBlockMap
//
void P_LoadBlockMap (int lump)
{
    int i;
    int count;
    int lumplen;

    lumplen = W_LumpLength(lump);
    count = lumplen / 2;
	
    blockmaplump = Z_Malloc(lumplen, PU_LEVEL, NULL);
    W_ReadLump(lump, blockmaplump);
    blockmap = blockmaplump + 4;

    // Swap all short integers to native byte ordering.
  
    for (i=0; i<count; i++)
    {
	blockmaplump[i] = SHORT(blockmaplump[i]);
    }
		
    // Read the header

    bmaporgx = blockmaplump[0]<<FRACBITS;
    bmaporgy = blockmaplump[1]<<FRACBITS;
    bmapwidth = blockmaplump[2];
    bmapheight = blockmaplump[3];
	
    // Clear out mobj chains

    count = sizeof(*blocklinks) * bmapwidth * bmapheight;
    blocklinks = Z_Malloc(count, PU_LEVEL, 0);
    memset(blocklinks, 0, count);
}



//
// P_GroupLines
// Builds sector line lists and subsector sector numbers.
// Finds block bounding boxes for sectors.
//
void P_GroupLines (void)
{
    line_t**		linebuffer;
    int			i;
    int			j;
    int			total;
    line_t*		li;
    sector_t*		sector;
    subsector_t*	ss;
    seg_t*		seg;
    fixed_t		bbox[4];
    int			block;
	
    // look up sector number for each subsector
    ss = subsectors;
    for (i=0 ; i<numsubsectors ; i++, ss++)
    {
	seg = &segs[ss->firstline];
	ss->sector = seg->sidedef->sector;
    }

    // count number of lines in each sector
    li = lines;
    total = 0;
    for (i=0 ; i<numlines ; i++, li++)
    {
	total++;
	li->frontsector->linecount++;

	if (li->backsector && li->backsector != li->frontsector)
	{
	    li->backsector->linecount++;
	    total++;
	}
    }

    // build line tables for each sector	
    linebuffer = Z_Malloc (total*sizeof(line_t *), PU_LEVEL, 0);

    for (i=0; i<numsectors; ++i)
    {
        // Assign the line buffer for this sector

        sectors[i].lines = linebuffer;
        linebuffer += sectors[i].linecount;

        // Reset linecount to zero so in the next stage we can count
        // lines into the list.

        sectors[i].linecount = 0;
    }

    // Assign lines to sectors

    for (i=0; i<numlines; ++i)
    { 
        li = &lines[i];

        if (li->frontsector != NULL)
        {
            sector = li->frontsector;

            sector->lines[sector->linecount] = li;
            ++sector->linecount;
        }

        if (li->backsector != NULL && li->frontsector != li->backsector)
        {
            sector = li->backsector;

            sector->lines[sector->linecount] = li;
            ++sector->linecount;
        }
    }
    
    // Generate bounding boxes for sectors
	
    sector = sectors;
    for (i=0 ; i<numsectors ; i++, sector++)
    {
	M_ClearBox (bbox);

	for (j=0 ; j<sector->linecount; j++)
	{
            li = sector->lines[j];

            M_AddToBox (bbox, li->v1->x, li->v1->y);
            M_AddToBox (bbox, li->v2->x, li->v2->y);
	}

	// set the degenmobj_t to the middle of the bounding box
	sector->soundorg.x = (bbox[BOXRIGHT]+bbox[BOXLEFT])/2;
	sector->soundorg.y = (bbox[BOXTOP]+bbox[BOXBOTTOM])/2;
		
	// adjust bounding box to map blocks
	block = (bbox[BOXTOP]-bmaporgy+MAXRADIUS)>>MAPBLOCKSHIFT;
	block = block >= bmapheight ? bmapheight-1 : block;
	sector->blockbox[BOXTOP]=block;

	block = (bbox[BOXBOTTOM]-bmaporgy-MAXRADIUS)>>MAPBLOCKSHIFT;
	block = block < 0 ? 0 : block;
	sector->blockbox[BOXBOTTOM]=block;

	block = (bbox[BOXRIGHT]-bmaporgx+MAXRADIUS)>>MAPBLOCKSHIFT;
	block = block >= bmapwidth ? bmapwidth-1 : block;
	sector->blockbox[BOXRIGHT]=block;

	block = (bbox[BOXLEFT]-bmaporgx-MAXRADIUS)>>MAPBLOCKSHIFT;
	block = block < 0 ? 0 : block;
	sector->blockbox[BOXLEFT]=block;
    }
	
}


//
// P_SetupLevel
//
void
P_SetupLevel
( int		episode,
  int		map,
  int		playermask,
  skill_t	skill)
{
    int		i;
    char	lumpname[9];
    int		lumpnum;
	
    totalkills = totalitems = totalsecret = wminfo.maxfrags = 0;
    wminfo.partime = 180;
    for (i=0 ; i<MAXPLAYERS ; i++)
    {
        // haleyjd 08/30/10: [STRIFE] Removed secretcount, itemcount
	players[i].killcount = 0;
    }

    // Initial height of PointOfView
    // will be set by player think.
    players[consoleplayer].viewz = 1; 

    // Make sure all sounds are stopped before Z_FreeTags.
    S_Start ();			

    
#if 0 // UNUSED
    if (debugfile)
    {
	Z_FreeTags (PU_LEVEL, INT_MAX);
	Z_FileDumpHeap (debugfile);
    }
    else
#endif
	Z_FreeTags (PU_LEVEL, PU_PURGELEVEL-1);


    // UNUSED W_Profile ();
    P_InitThinkers ();
	   
    // find map name
    if ( gamemode == commercial)
    {
	if (map<10)
	    sprintf (lumpname, DEH_String("map0%i"), map);
	else
	    sprintf (lumpname, DEH_String("map%i"), map);
    }
    else
    {
	lumpname[0] = 'E';
	lumpname[1] = '0' + episode;
	lumpname[2] = 'M';
	lumpname[3] = '0' + map;
	lumpname[4] = 0;
    }

    lumpnum = W_GetNumForName (lumpname);
	
    leveltime = 0;
	
    // note: most of this ordering is important	
    P_LoadBlockMap (lumpnum+ML_BLOCKMAP);
    P_LoadVertexes (lumpnum+ML_VERTEXES);
    P_LoadSectors (lumpnum+ML_SECTORS);
    P_LoadSideDefs (lumpnum+ML_SIDEDEFS);

    P_LoadLineDefs (lumpnum+ML_LINEDEFS);
    P_LoadSubsectors (lumpnum+ML_SSECTORS);
    P_LoadNodes (lumpnum+ML_NODES);
    P_LoadSegs (lumpnum+ML_SEGS);
	
    rejectmatrix = W_CacheLumpNum (lumpnum+ML_REJECT,PU_LEVEL);
    P_GroupLines ();

    bodyqueslot = 0;
    deathmatch_p = deathmatchstarts;
    P_LoadThings (lumpnum+ML_THINGS);
    
    // if deathmatch, randomly spawn the active players
    if (deathmatch)
    {
	for (i=0 ; i<MAXPLAYERS ; i++)
	    if (playeringame[i])
	    {
		players[i].mo = NULL;
		G_DeathMatchSpawnPlayer (i);
	    }
			
    }

    // clear special respawning que
    iquehead = iquetail = 0;		
	
    // set up world state
    P_SpawnSpecials ();
	
    // build subsector connect matrix
    //	UNUSED P_ConnectSubsectors ();

    // preload graphics
    if (precache)
	R_PrecacheLevel ();

    //printf ("free memory: 0x%x\n", Z_FreeMemory());

}



//
// P_Init
//
void P_Init (void)
{
    P_InitSwitchList();
    P_InitPicAnims();
    P_InitTerrainTypes();   // villsa [STRIFE]
    R_InitSprites(sprnames);
}