/*
Copyright (C) 1996-1997 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// models.c -- model loading and caching

// models are the only shared resource between a client and server running
// on the same machine.

#include "qwsvdef.h"

model_t *loadmodel;
char  loadname[32]; // for hunk tags

void Mod_LoadSpriteModel (model_t *mod, void *buffer);
void Mod_LoadBrushModel (model_t *mod, void *buffer);
void Mod_LoadAliasModel (model_t *mod, void *buffer);
model_t *Mod_LoadModel (model_t *mod, qboolean crash);

byte  mod_novis[MAX_MAP_LEAFS/8];

#define MAX_MOD_KNOWN 256
model_t mod_known[MAX_MOD_KNOWN];
int   mod_numknown;

texture_t r_notexture_mip;

unsigned *model_checksum;

/*
===============
Mod_Init
===============
*/
void Mod_Init (void)
{
  memset (mod_novis, 0xff, sizeof(mod_novis));
}

/*
===============
Mod_PointInLeaf
===============
*/
mleaf_t *Mod_PointInLeaf (vec3_t p, model_t *model)
{
  mnode_t   *node;
  float   d;
  mplane_t  *plane;
  
  if (!model || !model->nodes)
    SV_Error ("Mod_PointInLeaf: bad model");

  node = model->nodes;
  while (1)
  {
    if (node->contents < 0)
      return (mleaf_t *)node;
    plane = node->plane;
    d = DotProduct (p,plane->normal) - plane->dist;
    if (d > 0)
      node = node->children[0];
    else
      node = node->children[1];
  }
  
  return NULL;  // never reached
}


/*
===================
Mod_DecompressVis
===================
*/
byte *Mod_DecompressVis (byte *in, model_t *model)
{
  static byte decompressed[MAX_MAP_LEAFS/8];
  int   c;
  byte  *out;
  int   row;

  row = (model->numleafs+7)>>3; 
  out = decompressed;

#if 0
  memcpy (out, in, row);
#else
  if (!in)
  { // no vis info, so make all visible
    while (row)
    {
      *out++ = 0xff;
      row--;
    }
    return decompressed;    
  }

  do
  {
    if (*in)
    {
      *out++ = *in++;
      continue;
    }
  
    c = in[1];
    in += 2;
    while (c)
    {
      *out++ = 0;
      c--;
    }
  } while (out - decompressed < row);
#endif
  
  return decompressed;
}

byte *Mod_LeafPVS (mleaf_t *leaf, model_t *model)
{
  if (leaf == model->leafs)
    return mod_novis;
  return Mod_DecompressVis (leaf->compressed_vis, model);
}

/*
===================
Mod_ClearAll
===================
*/
void Mod_ClearAll (void)
{
  int   i;
  model_t *mod;
  
  for (i=0 , mod=mod_known ; i<mod_numknown ; i++, mod++)
    if (mod->type != mod_alias)
      mod->needload = true;
}

/*
==================
Mod_FindName

==================
*/
model_t *Mod_FindName (char *name)
{
  int   i;
  model_t *mod;
  
  if (!name[0])
    SV_Error ("Mod_ForName: NULL name");
    
//
// search the currently loaded models
//
  for (i=0 , mod=mod_known ; i<mod_numknown ; i++, mod++)
    if (!strcmp (mod->name, name) )
      break;
      
  if (i == mod_numknown)
  {
    if (mod_numknown == MAX_MOD_KNOWN)
      SV_Error ("mod_numknown == MAX_MOD_KNOWN");
    strcpy (mod->name, name);
    mod->needload = true;
    mod_numknown++;
  }

  return mod;
}


/*
==================
Mod_LoadModel

Loads a model into the cache
==================
*/
model_t *Mod_LoadModel (model_t *mod, qboolean crash)
{
  void  *d;
  unsigned *buf;
  byte  stackbuf[1024];   // avoid dirtying the cache heap

  if (!mod->needload)
  {
    if (mod->type == mod_alias)
    {
      d = Cache_Check (&mod->cache);
      if (d)
        return mod;
    }
    else
      return mod;   // not cached at all
  }
  
//
// load the file
//
  buf = (unsigned *)COM_LoadStackFile (mod->name, stackbuf, sizeof(stackbuf));
  if (!buf)
  {
    if (crash)
      SV_Error ("Mod_NumForName: %s not found", mod->name);
    return NULL;
  }
  
//
// allocate a new model
//
  COM_FileBase (mod->name, loadname);
  
  loadmodel = mod;

//
// fill it in
//

// call the apropriate loader
  mod->needload = false;
  
  Mod_LoadBrushModel (mod, buf);

  return mod;
}

/*
==================
Mod_ForName

Loads in a model for the given name
==================
*/
model_t *Mod_ForName (char *name, qboolean crash)
{
  model_t *mod;
  
  mod = Mod_FindName (name);
  
  return Mod_LoadModel (mod, crash);
}


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

          BRUSHMODEL LOADING

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

byte  *mod_base;


/*
=================
Mod_LoadTextures
=================
*/
void Mod_LoadTextures (lump_t *l)
{
  int   i, j, pixels, num, max, altmax;
  miptex_t  *mt;
  texture_t *tx, *tx2;
  texture_t *anims[10];
  texture_t *altanims[10];
  dmiptexlump_t *m;

  if (!l->filelen)
  {
    loadmodel->textures = NULL;
    return;
  }
  m = (dmiptexlump_t *)(mod_base + l->fileofs);
  
  m->nummiptex = LittleLong (m->nummiptex);
  
  loadmodel->numtextures = m->nummiptex;
  loadmodel->textures = Hunk_AllocName (m->nummiptex * sizeof(*loadmodel->textures) , loadname);

  for (i=0 ; i<m->nummiptex ; i++)
  {
    m->dataofs[i] = LittleLong(m->dataofs[i]);
    if (m->dataofs[i] == -1)
      continue;
    mt = (miptex_t *)((byte *)m + m->dataofs[i]);
    mt->width = LittleLong (mt->width);
    mt->height = LittleLong (mt->height);
    for (j=0 ; j<MIPLEVELS ; j++)
      mt->offsets[j] = LittleLong (mt->offsets[j]);
    
    if ( (mt->width & 15) || (mt->height & 15) )
      SV_Error ("Texture %s is not 16 aligned", mt->name);
    pixels = mt->width*mt->height/64*85;
    tx = Hunk_AllocName (sizeof(texture_t) +pixels, loadname );
    loadmodel->textures[i] = tx;

    memcpy (tx->name, mt->name, sizeof(tx->name));
    tx->width = mt->width;
    tx->height = mt->height;
    for (j=0 ; j<MIPLEVELS ; j++)
      tx->offsets[j] = mt->offsets[j] + sizeof(texture_t) - sizeof(miptex_t);
    // the pixels immediately follow the structures
    memcpy ( tx+1, mt+1, pixels);
  }

//
// sequence the animations
//
  for (i=0 ; i<m->nummiptex ; i++)
  {
    tx = loadmodel->textures[i];
    if (!tx || tx->name[0] != '+')
      continue;
    if (tx->anim_next)
      continue; // allready sequenced

  // find the number of frames in the animation
    memset (anims, 0, sizeof(anims));
    memset (altanims, 0, sizeof(altanims));

    max = tx->name[1];
    altmax = 0;
    if (max >= 'a' && max <= 'z')
      max -= 'a' - 'A';
    if (max >= '0' && max <= '9')
    {
      max -= '0';
      altmax = 0;
      anims[max] = tx;
      max++;
    }
    else if (max >= 'A' && max <= 'J')
    {
      altmax = max - 'A';
      max = 0;
      altanims[altmax] = tx;
      altmax++;
    }
    else
      SV_Error ("Bad animating texture %s", tx->name);

    for (j=i+1 ; j<m->nummiptex ; j++)
    {
      tx2 = loadmodel->textures[j];
      if (!tx2 || tx2->name[0] != '+')
        continue;
      if (strcmp (tx2->name+2, tx->name+2))
        continue;

      num = tx2->name[1];
      if (num >= 'a' && num <= 'z')
        num -= 'a' - 'A';
      if (num >= '0' && num <= '9')
      {
        num -= '0';
        anims[num] = tx2;
        if (num+1 > max)
          max = num + 1;
      }
      else if (num >= 'A' && num <= 'J')
      {
        num = num - 'A';
        altanims[num] = tx2;
        if (num+1 > altmax)
          altmax = num+1;
      }
      else
        SV_Error ("Bad animating texture %s", tx->name);
    }
    
#define ANIM_CYCLE  2
  // link them all together
    for (j=0 ; j<max ; j++)
    {
      tx2 = anims[j];
      if (!tx2)
        SV_Error ("Missing frame %i of %s",j, tx->name);
      tx2->anim_total = max * ANIM_CYCLE;
      tx2->anim_min = j * ANIM_CYCLE;
      tx2->anim_max = (j+1) * ANIM_CYCLE;
      tx2->anim_next = anims[ (j+1)%max ];
      if (altmax)
        tx2->alternate_anims = altanims[0];
    }
    for (j=0 ; j<altmax ; j++)
    {
      tx2 = altanims[j];
      if (!tx2)
        SV_Error ("Missing frame %i of %s",j, tx->name);
      tx2->anim_total = altmax * ANIM_CYCLE;
      tx2->anim_min = j * ANIM_CYCLE;
      tx2->anim_max = (j+1) * ANIM_CYCLE;
      tx2->anim_next = altanims[ (j+1)%altmax ];
      if (max)
        tx2->alternate_anims = anims[0];
    }
  }
}

/*
=================
Mod_LoadLighting
=================
*/
void Mod_LoadLighting (lump_t *l)
{
  if (!l->filelen)
  {
    loadmodel->lightdata = NULL;
    return;
  }
  loadmodel->lightdata = Hunk_AllocName ( l->filelen, loadname);  
  memcpy (loadmodel->lightdata, mod_base + l->fileofs, l->filelen);
}


/*
=================
Mod_LoadVisibility
=================
*/
void Mod_LoadVisibility (lump_t *l)
{
  if (!l->filelen)
  {
    loadmodel->visdata = NULL;
    return;
  }
  loadmodel->visdata = Hunk_AllocName ( l->filelen, loadname);  
  memcpy (loadmodel->visdata, mod_base + l->fileofs, l->filelen);
}


/*
=================
Mod_LoadEntities
=================
*/
void Mod_LoadEntities (lump_t *l)
{
  if (!l->filelen)
  {
    loadmodel->entities = NULL;
    return;
  }
  loadmodel->entities = Hunk_AllocName ( l->filelen, loadname); 
  memcpy (loadmodel->entities, mod_base + l->fileofs, l->filelen);
}


/*
=================
Mod_LoadVertexes
=================
*/
void Mod_LoadVertexes (lump_t *l)
{
  dvertex_t *in;
  mvertex_t *out;
  int     i, count;

  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( count*sizeof(*out), loadname); 

  loadmodel->vertexes = out;
  loadmodel->numvertexes = count;

  for ( i=0 ; i<count ; i++, in++, out++)
  {
    out->position[0] = LittleFloat (in->point[0]);
    out->position[1] = LittleFloat (in->point[1]);
    out->position[2] = LittleFloat (in->point[2]);
  }
}

/*
=================
Mod_LoadSubmodels
=================
*/
void Mod_LoadSubmodels (lump_t *l)
{
  dmodel_t  *in;
  dmodel_t  *out;
  int     i, j, count;

  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( count*sizeof(*out), loadname); 

  loadmodel->submodels = out;
  loadmodel->numsubmodels = count;

  for ( i=0 ; i<count ; i++, in++, out++)
  {
    for (j=0 ; j<3 ; j++)
    { // spread the mins / maxs by a pixel
      out->mins[j] = LittleFloat (in->mins[j]) - 1;
      out->maxs[j] = LittleFloat (in->maxs[j]) + 1;
      out->origin[j] = LittleFloat (in->origin[j]);
    }
    for (j=0 ; j<MAX_MAP_HULLS ; j++)
      out->headnode[j] = LittleLong (in->headnode[j]);
    out->visleafs = LittleLong (in->visleafs);
    out->firstface = LittleLong (in->firstface);
    out->numfaces = LittleLong (in->numfaces);
  }
}

/*
=================
Mod_LoadEdges
=================
*/
void Mod_LoadEdges (lump_t *l)
{
  dedge_t *in;
  medge_t *out;
  int   i, count;

  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( (count + 1) * sizeof(*out), loadname); 

  loadmodel->edges = out;
  loadmodel->numedges = count;

  for ( i=0 ; i<count ; i++, in++, out++)
  {
    out->v[0] = (unsigned short)LittleShort(in->v[0]);
    out->v[1] = (unsigned short)LittleShort(in->v[1]);
  }
}

/*
=================
Mod_LoadTexinfo
=================
*/
void Mod_LoadTexinfo (lump_t *l)
{
  texinfo_t *in;
  mtexinfo_t *out;
  int   i, j, count;
  int   miptex;
  float len1, len2;

  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( count*sizeof(*out), loadname); 

  loadmodel->texinfo = out;
  loadmodel->numtexinfo = count;

  for ( i=0 ; i<count ; i++, in++, out++)
  {
#if 0
    for (j=0 ; j<8 ; j++)
      out->vecs[0][j] = LittleFloat (in->vecs[0][j]);
    len1 = Length (in->vecs[0]);
    len2 = Length (in->vecs[1]);
#else
    for (j=0 ; j<4 ; j++) {
      out->vecs[0][j] = LittleFloat (in->vecs[0][j]);
      out->vecs[1][j] = LittleFloat (in->vecs[1][j]);
    }
    len1 = Length (out->vecs[0]);
    len2 = Length (out->vecs[1]);
#endif
    if (len1 + len2 < 2 /*0.001*/)
      out->mipadjust = 1;
    else
      out->mipadjust = 1 / floor( (len1+len2)/2 );

    miptex = LittleLong (in->miptex);
    out->flags = LittleLong (in->flags);
  
    if (!loadmodel->textures)
    {
      out->texture = &r_notexture_mip;  // checkerboard texture
      out->flags = 0;
    }
    else
    {
      if (miptex >= loadmodel->numtextures)
        SV_Error ("miptex >= loadmodel->numtextures");
      out->texture = loadmodel->textures[miptex];
      if (!out->texture)
      {
        out->texture = &r_notexture_mip; // texture not found
        out->flags = 0;
      }
    }
  }
}

/*
================
CalcSurfaceExtents

Fills in s->texturemins[] and s->extents[]
================
*/
void CalcSurfaceExtents (msurface_t *s)
{
  float mins[2], maxs[2], val;
  int   i,j, e;
  mvertex_t *v;
  mtexinfo_t  *tex;
  int   bmins[2], bmaxs[2];

  mins[0] = mins[1] = 999999;
  maxs[0] = maxs[1] = -99999;

  tex = s->texinfo;
  
  for (i=0 ; i<s->numedges ; i++)
  {
    e = loadmodel->surfedges[s->firstedge+i];
    if (e >= 0)
      v = &loadmodel->vertexes[loadmodel->edges[e].v[0]];
    else
      v = &loadmodel->vertexes[loadmodel->edges[-e].v[1]];
    
    for (j=0 ; j<2 ; j++)
    {
      val = v->position[0] * tex->vecs[j][0] + 
        v->position[1] * tex->vecs[j][1] +
        v->position[2] * tex->vecs[j][2] +
        tex->vecs[j][3];
      if (val < mins[j])
        mins[j] = val;
      if (val > maxs[j])
        maxs[j] = val;
    }
  }

  for (i=0 ; i<2 ; i++)
  { 
    bmins[i] = floor(mins[i]/16);
    bmaxs[i] = ceil(maxs[i]/16);

    s->texturemins[i] = bmins[i] * 16;
    s->extents[i] = (bmaxs[i] - bmins[i]) * 16;
    if ( !(tex->flags & TEX_SPECIAL) && s->extents[i] > 256)
      SV_Error ("Bad surface extents");
  }
}


/*
=================
Mod_LoadFaces
=================
*/
void Mod_LoadFaces (lump_t *l)
{
  dface_t   *in;
  msurface_t  *out;
  int     i, count, surfnum;
  int     planenum, side;

  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( count*sizeof(*out), loadname); 

  loadmodel->surfaces = out;
  loadmodel->numsurfaces = count;

  for ( surfnum=0 ; surfnum<count ; surfnum++, in++, out++)
  {
    out->firstedge = LittleLong(in->firstedge);
    out->numedges = LittleShort(in->numedges);    
    out->flags = 0;

    planenum = LittleShort(in->planenum);
    side = LittleShort(in->side);
    if (side)
      out->flags |= SURF_PLANEBACK;     

    out->plane = loadmodel->planes + planenum;

    out->texinfo = loadmodel->texinfo + LittleShort (in->texinfo);

    CalcSurfaceExtents (out);
        
  // lighting info

    for (i=0 ; i<MAXLIGHTMAPS ; i++)
      out->styles[i] = in->styles[i];
    i = LittleLong(in->lightofs);
    if (i == -1)
      out->samples = NULL;
    else
      out->samples = loadmodel->lightdata + i;
    
  // set the drawing flags flag
    
    if (!Q_strncmp(out->texinfo->texture->name,"sky",3))  // sky
    {
      out->flags |= (SURF_DRAWSKY | SURF_DRAWTILED);
      continue;
    }
    
    if (!Q_strncmp(out->texinfo->texture->name,"*",1))    // turbulent
    {
      out->flags |= (SURF_DRAWTURB | SURF_DRAWTILED);
      for (i=0 ; i<2 ; i++)
      {
        out->extents[i] = 16384;
        out->texturemins[i] = -8192;
      }
      continue;
    }
  }
}


/*
=================
Mod_SetParent
=================
*/
void Mod_SetParent (mnode_t *node, mnode_t *parent)
{
  node->parent = parent;
  if (node->contents < 0)
    return;
  Mod_SetParent (node->children[0], node);
  Mod_SetParent (node->children[1], node);
}

/*
=================
Mod_LoadNodes
=================
*/
void Mod_LoadNodes (lump_t *l)
{
  int     i, j, count, p;
  dnode_t   *in;
  mnode_t   *out;

  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( count*sizeof(*out), loadname); 

  loadmodel->nodes = out;
  loadmodel->numnodes = count;

  for ( i=0 ; i<count ; i++, in++, out++)
  {
    for (j=0 ; j<3 ; j++)
    {
      out->minmaxs[j] = LittleShort (in->mins[j]);
      out->minmaxs[3+j] = LittleShort (in->maxs[j]);
    }
  
    p = LittleLong(in->planenum);
    out->plane = loadmodel->planes + p;

    out->firstsurface = LittleShort (in->firstface);
    out->numsurfaces = LittleShort (in->numfaces);
    
    for (j=0 ; j<2 ; j++)
    {
      p = LittleShort (in->children[j]);
      if (p >= 0)
        out->children[j] = loadmodel->nodes + p;
      else
        out->children[j] = (mnode_t *)(loadmodel->leafs + (-1 - p));
    }
  }
  
  Mod_SetParent (loadmodel->nodes, NULL); // sets nodes and leafs
}

/*
=================
Mod_LoadLeafs
=================
*/
void Mod_LoadLeafs (lump_t *l)
{
  dleaf_t   *in;
  mleaf_t   *out;
  int     i, j, count, p;

  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( count*sizeof(*out), loadname); 

  loadmodel->leafs = out;
  loadmodel->numleafs = count;

  for ( i=0 ; i<count ; i++, in++, out++)
  {
    for (j=0 ; j<3 ; j++)
    {
      out->minmaxs[j] = LittleShort (in->mins[j]);
      out->minmaxs[3+j] = LittleShort (in->maxs[j]);
    }

    p = LittleLong(in->contents);
    out->contents = p;

    out->firstmarksurface = loadmodel->marksurfaces +
      LittleShort(in->firstmarksurface);
    out->nummarksurfaces = LittleShort(in->nummarksurfaces);
    
    p = LittleLong(in->visofs);
    if (p == -1)
      out->compressed_vis = NULL;
    else
      out->compressed_vis = loadmodel->visdata + p;
    out->efrags = NULL;
    
    for (j=0 ; j<4 ; j++)
      out->ambient_sound_level[j] = in->ambient_level[j];
  } 
}

/*
=================
Mod_LoadClipnodes
=================
*/
void Mod_LoadClipnodes (lump_t *l)
{
  dclipnode_t *in, *out;
  int     i, count;
  hull_t    *hull;

  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( count*sizeof(*out), loadname); 

  loadmodel->clipnodes = out;
  loadmodel->numclipnodes = count;

  hull = &loadmodel->hulls[1];
  hull->clipnodes = out;
  hull->firstclipnode = 0;
  hull->lastclipnode = count-1;
  hull->planes = loadmodel->planes;
  hull->clip_mins[0] = -16;
  hull->clip_mins[1] = -16;
  hull->clip_mins[2] = -24;
  hull->clip_maxs[0] = 16;
  hull->clip_maxs[1] = 16;
  hull->clip_maxs[2] = 32;

  hull = &loadmodel->hulls[2];
  hull->clipnodes = out;
  hull->firstclipnode = 0;
  hull->lastclipnode = count-1;
  hull->planes = loadmodel->planes;
  hull->clip_mins[0] = -32;
  hull->clip_mins[1] = -32;
  hull->clip_mins[2] = -24;
  hull->clip_maxs[0] = 32;
  hull->clip_maxs[1] = 32;
  hull->clip_maxs[2] = 64;

  for (i=0 ; i<count ; i++, out++, in++)
  {
    out->planenum = LittleLong(in->planenum);
    out->children[0] = LittleShort(in->children[0]);
    out->children[1] = LittleShort(in->children[1]);
  }
}

/*
=================
Mod_MakeHull0

Deplicate the drawing hull structure as a clipping hull
=================
*/
void Mod_MakeHull0 (void)
{
  mnode_t   *in, *child;
  dclipnode_t *out;
  int     i, j, count;
  hull_t    *hull;
  
  hull = &loadmodel->hulls[0];  
  
  in = loadmodel->nodes;
  count = loadmodel->numnodes;
  out = Hunk_AllocName ( count*sizeof(*out), loadname); 

  hull->clipnodes = out;
  hull->firstclipnode = 0;
  hull->lastclipnode = count-1;
  hull->planes = loadmodel->planes;

  for (i=0 ; i<count ; i++, out++, in++)
  {
    out->planenum = in->plane - loadmodel->planes;
    for (j=0 ; j<2 ; j++)
    {
      child = in->children[j];
      if (child->contents < 0)
        out->children[j] = child->contents;
      else
        out->children[j] = child - loadmodel->nodes;
    }
  }
}

/*
=================
Mod_LoadMarksurfaces
=================
*/
void Mod_LoadMarksurfaces (lump_t *l)
{ 
  int   i, j, count;
  short   *in;
  msurface_t **out;
  
  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( count*sizeof(*out), loadname); 

  loadmodel->marksurfaces = out;
  loadmodel->nummarksurfaces = count;

  for ( i=0 ; i<count ; i++)
  {
    j = LittleShort(in[i]);
    if (j >= loadmodel->numsurfaces)
      SV_Error ("Mod_ParseMarksurfaces: bad surface number");
    out[i] = loadmodel->surfaces + j;
  }
}

/*
=================
Mod_LoadSurfedges
=================
*/
void Mod_LoadSurfedges (lump_t *l)
{ 
  int   i, count;
  int   *in, *out;
  
  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( count*sizeof(*out), loadname); 

  loadmodel->surfedges = out;
  loadmodel->numsurfedges = count;

  for ( i=0 ; i<count ; i++)
    out[i] = LittleLong (in[i]);
}

/*
=================
Mod_LoadPlanes
=================
*/
void Mod_LoadPlanes (lump_t *l)
{
  int     i, j;
  mplane_t  *out;
  dplane_t  *in;
  int     count;
  int     bits;
  
  in = (void *)(mod_base + l->fileofs);
  if (l->filelen % sizeof(*in))
    SV_Error ("MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
  count = l->filelen / sizeof(*in);
  out = Hunk_AllocName ( count*2*sizeof(*out), loadname); 
  
  loadmodel->planes = out;
  loadmodel->numplanes = count;

  for ( i=0 ; i<count ; i++, in++, out++)
  {
    bits = 0;
    for (j=0 ; j<3 ; j++)
    {
      out->normal[j] = LittleFloat (in->normal[j]);
      if (out->normal[j] < 0)
        bits |= 1<<j;
    }

    out->dist = LittleFloat (in->dist);
    out->type = LittleLong (in->type);
    out->signbits = bits;
  }
}


/*
=================
Mod_LoadBrushModel
=================
*/
void Mod_LoadBrushModel (model_t *mod, void *buffer)
{
  int     i, j;
  dheader_t *header;
  dmodel_t  *bm;
  
  loadmodel->type = mod_brush;
  
  header = (dheader_t *)buffer;

  i = LittleLong (header->version);
  if (i != BSPVERSION)
    SV_Error ("Mod_LoadBrushModel: %s has wrong version number (%i should be %i)", mod->name, i, BSPVERSION);

// swap all the lumps
  mod_base = (byte *)header;

  for (i=0 ; i<sizeof(dheader_t)/4 ; i++)
    ((int *)header)[i] = LittleLong ( ((int *)header)[i]);

// load into heap

  mod->checksum = 0;
  mod->checksum2 = 0;

  // checksum all of the map, except for entities
  for (i = 0; i < HEADER_LUMPS; i++) {
    if (i == LUMP_ENTITIES)
      continue;
    mod->checksum ^= LittleLong(Com_BlockChecksum(mod_base + header->lumps[i].fileofs, 
      header->lumps[i].filelen));

    if (i == LUMP_VISIBILITY || i == LUMP_LEAFS || i == LUMP_NODES)
      continue;
    mod->checksum2 ^= LittleLong(Com_BlockChecksum(mod_base + header->lumps[i].fileofs, 
      header->lumps[i].filelen));
  }

  Mod_LoadVertexes (&header->lumps[LUMP_VERTEXES]);
  Mod_LoadEdges (&header->lumps[LUMP_EDGES]);
  Mod_LoadSurfedges (&header->lumps[LUMP_SURFEDGES]);
  Mod_LoadTextures (&header->lumps[LUMP_TEXTURES]);
  Mod_LoadLighting (&header->lumps[LUMP_LIGHTING]);
  Mod_LoadPlanes (&header->lumps[LUMP_PLANES]);
  Mod_LoadTexinfo (&header->lumps[LUMP_TEXINFO]);
  Mod_LoadFaces (&header->lumps[LUMP_FACES]);
  Mod_LoadMarksurfaces (&header->lumps[LUMP_MARKSURFACES]);
  Mod_LoadVisibility (&header->lumps[LUMP_VISIBILITY]);
  Mod_LoadLeafs (&header->lumps[LUMP_LEAFS]);
  Mod_LoadNodes (&header->lumps[LUMP_NODES]);
  Mod_LoadClipnodes (&header->lumps[LUMP_CLIPNODES]);
  Mod_LoadEntities (&header->lumps[LUMP_ENTITIES]);
  Mod_LoadSubmodels (&header->lumps[LUMP_MODELS]);

  Mod_MakeHull0 ();
  
  mod->numframes = 2;   // regular and alternate animation
  
//
// set up the submodels (FIXME: this is confusing)
//
  for (i=0 ; i<mod->numsubmodels ; i++)
  {
    bm = &mod->submodels[i];

    mod->hulls[0].firstclipnode = bm->headnode[0];
    for (j=1 ; j<MAX_MAP_HULLS ; j++)
    {
      mod->hulls[j].firstclipnode = bm->headnode[j];
      mod->hulls[j].lastclipnode = mod->numclipnodes-1;
    }
    
    mod->firstmodelsurface = bm->firstface;
    mod->nummodelsurfaces = bm->numfaces;
    
    VectorCopy (bm->maxs, mod->maxs);
    VectorCopy (bm->mins, mod->mins);
  
    mod->numleafs = bm->visleafs;

    if (i < mod->numsubmodels-1)
    { // duplicate the basic information
      char  name[10];

      sprintf (name, "*%i", i+1);
      loadmodel = Mod_FindName (name);
      *loadmodel = *mod;
      strcpy (loadmodel->name, name);
      mod = loadmodel;
    }
  }
}