r_model.c

Go to the documentation of this file.

/*
Copyright (C) 1997-2001 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 "r_local.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;
 
// the inline * models from the current map are kept seperate
model_t mod_inline[MAX_MOD_KNOWN];
 
int     registration_sequence;
int     modfilelen;
 
//===============================================================================
 
 
/*
================
Mod_Modellist_f
================
*/
void Mod_Modellist_f (void)
{
    int     i;
    model_t *mod;
    int     total;
 
    total = 0;
    ri.Con_Printf (PRINT_ALL,"Loaded models:\n");
    for (i=0, mod=mod_known ; i < mod_numknown ; i++, mod++)
    {
        if (!mod->name[0])
            continue;
        ri.Con_Printf (PRINT_ALL, "%8i : %s\n",mod->extradatasize, mod->name);
        total += mod->extradatasize;
    }
    ri.Con_Printf (PRINT_ALL, "Total resident: %i\n", total);
}
 
/*
===============
Mod_Init
===============
*/
void Mod_Init (void)
{
    memset (mod_novis, 0xff, sizeof(mod_novis));
}
 
/*
==================
Mod_ForName
 
Loads in a model for the given name
==================
*/
model_t *Mod_ForName (char *name, qboolean crash)
{
    model_t *mod;
    unsigned *buf;
    int     i;
    
    if (!name[0])
        ri.Sys_Error (ERR_DROP,"Mod_ForName: NULL name");
 
    //
    // inline models are grabbed only from worldmodel
    //
    if (name[0] == '*')
    {
        i = atoi(name+1);
        if (i < 1 || !r_worldmodel || i >= r_worldmodel->numsubmodels)
            ri.Sys_Error (ERR_DROP, "bad inline model number");
        return &mod_inline[i];
    }
 
    //
    // search the currently loaded models
    //
    for (i=0 , mod=mod_known ; i<mod_numknown ; i++, mod++)
        if (!strcmp (mod->name, name) )
            return mod;
            
    //
    // find a free model slot spot
    //
    for (i=0 , mod=mod_known ; i<mod_numknown ; i++, mod++)
    {
        if (!mod->name[0])
            break;  // free spot
    }
    if (i == mod_numknown)
    {
        if (mod_numknown == MAX_MOD_KNOWN)
            ri.Sys_Error (ERR_DROP, "mod_numknown == MAX_MOD_KNOWN");
        mod_numknown++;
    }
    strcpy (mod->name, name);
    
    //
    // load the file
    //
    modfilelen = ri.FS_LoadFile (mod->name, (void **)&buf);
    if (!buf)
    {
        if (crash)
            ri.Sys_Error (ERR_DROP,"Mod_NumForName: %s not found", mod->name);
        memset (mod->name, 0, sizeof(mod->name));
        return NULL;
    }
    
    loadmodel = mod;
 
    //
    // fill it in
    //
 
    // call the apropriate loader
    
    switch (LittleLong(*(unsigned *)buf))
    {
    case IDALIASHEADER:
        loadmodel->extradata = Hunk_Begin (0x200000);
        Mod_LoadAliasModel (mod, buf);
        break;
        
    case IDSPRITEHEADER:
        loadmodel->extradata = Hunk_Begin (0x10000);
        Mod_LoadSpriteModel (mod, buf);
        break;
    
    case IDBSPHEADER:
        loadmodel->extradata = Hunk_Begin (0x1000000);
        Mod_LoadBrushModel (mod, buf);
        break;
 
    default:
        ri.Sys_Error (ERR_DROP,"Mod_NumForName: unknown fileid for %s", mod->name);
        break;
    }
 
    loadmodel->extradatasize = Hunk_End ();
 
    ri.FS_FreeFile (buf);
 
    return mod;
}
 
 
/*
===============
Mod_PointInLeaf
===============
*/
mleaf_t *Mod_PointInLeaf (vec3_t p, model_t *model)
{
    mnode_t     *node;
    float       d;
    mplane_t    *plane;
    
    if (!model || !model->nodes)
        ri.Sys_Error (ERR_DROP, "Mod_PointInLeaf: bad model");
 
    node = model->nodes;
    while (1)
    {
        if (node->contents != -1)
            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->vis->numclusters+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;
}
 
/*
==============
Mod_ClusterPVS
==============
*/
byte *Mod_ClusterPVS (int cluster, model_t *model)
{
    if (cluster == -1 || !model->vis)
        return mod_novis;
    return Mod_DecompressVis ( (byte *)model->vis + model->vis->bitofs[cluster][DVIS_PVS],
        model);
}
 
/*
===============================================================================
 
                    BRUSHMODEL LOADING
 
===============================================================================
*/
 
byte    *mod_base;
 
 
/*
=================
Mod_LoadLighting
 
Converts the 24 bit lighting down to 8 bit
by taking the brightest component
=================
*/
void Mod_LoadLighting (lump_t *l)
{
    int     i, size;
    byte    *in;
 
    if (!l->filelen)
    {
        loadmodel->lightdata = NULL;
        return;
    }
    size = l->filelen/3;
    loadmodel->lightdata = Hunk_Alloc (size);
    in = (void *)(mod_base + l->fileofs);
    for (i=0 ; i<size ; i++, in+=3)
    {
        if (in[0] > in[1] && in[0] > in[2])
            loadmodel->lightdata[i] = in[0];
        else if (in[1] > in[0] && in[1] > in[2])
            loadmodel->lightdata[i] = in[1];
        else
            loadmodel->lightdata[i] = in[2];
    }
}
 
 
int     r_leaftovis[MAX_MAP_LEAFS];
int     r_vistoleaf[MAX_MAP_LEAFS];
int     r_numvisleafs;
 
void    R_NumberLeafs (mnode_t *node)
{
    mleaf_t *leaf;
    int     leafnum;
 
    if (node->contents != -1)
    {
        leaf = (mleaf_t *)node;
        leafnum = leaf - loadmodel->leafs;
        if (leaf->contents & CONTENTS_SOLID)
            return;
        r_leaftovis[leafnum] = r_numvisleafs;
        r_vistoleaf[r_numvisleafs] = leafnum;
        r_numvisleafs++;
        return;
    }
 
    R_NumberLeafs (node->children[0]);
    R_NumberLeafs (node->children[1]);
}
 
 
/*
=================
Mod_LoadVisibility
=================
*/
void Mod_LoadVisibility (lump_t *l)
{
    int     i;
 
    if (!l->filelen)
    {
        loadmodel->vis = NULL;
        return;
    }
    loadmodel->vis = Hunk_Alloc ( l->filelen);  
    memcpy (loadmodel->vis, mod_base + l->fileofs, l->filelen);
 
    loadmodel->vis->numclusters = LittleLong (loadmodel->vis->numclusters);
    for (i=0 ; i<loadmodel->vis->numclusters ; i++)
    {
        loadmodel->vis->bitofs[i][0] = LittleLong (loadmodel->vis->bitofs[i][0]);
        loadmodel->vis->bitofs[i][1] = LittleLong (loadmodel->vis->bitofs[i][1]);
    }
}
 
 
/*
=================
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))
        ri.Sys_Error (ERR_DROP,"MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
    count = l->filelen / sizeof(*in);
    out = Hunk_Alloc ( (count+8)*sizeof(*out));     // extra for skybox
        /*
         * PATCH: eliasm
         *
         * This patch fixes the problem where the games dumped core
         * when changing levels.
         */
        memset( out, 0, (count + 6) * sizeof( *out ) );
        /* END OF PATCH */
 
    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))
        ri.Sys_Error (ERR_DROP,"MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
    count = l->filelen / sizeof(*in);
    out = Hunk_Alloc ( count*sizeof(*out)); 
 
    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]);
        }
        out->headnode = LittleLong (in->headnode);
        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))
        ri.Sys_Error (ERR_DROP,"MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
    count = l->filelen / sizeof(*in);
    out = Hunk_Alloc ( (count + 13) * sizeof(*out));    // extra for skybox
 
    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, *step;
    int     i, j, count;
    float   len1, len2;
    char    name[MAX_QPATH];
    int     next;
 
    in = (void *)(mod_base + l->fileofs);
    if (l->filelen % sizeof(*in))
        ri.Sys_Error (ERR_DROP,"MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
    count = l->filelen / sizeof(*in);
    out = Hunk_Alloc ( (count+6)*sizeof(*out)); // extra for skybox
 
    loadmodel->texinfo = out;
    loadmodel->numtexinfo = count;
 
    for ( i=0 ; i<count ; i++, in++, out++)
    {
        for (j=0 ; j<8 ; j++)
            out->vecs[0][j] = LittleFloat (in->vecs[0][j]);
        len1 = VectorLength (out->vecs[0]);
        len2 = VectorLength (out->vecs[1]);
        len1 = (len1 + len2)/2;
        if (len1 < 0.32)
            out->mipadjust = 4;
        else if (len1 < 0.49)
            out->mipadjust = 3;
        else if (len1 < 0.99)
            out->mipadjust = 2;
        else
            out->mipadjust = 1;
#if 0
        if (len1 + len2 < 0.001)
            out->mipadjust = 1;     // don't crash
        else
            out->mipadjust = 1 / floor( (len1+len2)/2 + 0.1 );
#endif
 
        out->flags = LittleLong (in->flags);
 
        next = LittleLong (in->nexttexinfo);
        if (next > 0)
            out->next = loadmodel->texinfo + next;
                /*
                 * PATCH: eliasm
                 *
                 * This patch fixes the problem where the game
                 * domed core when loading a new level.
                 */
                else {
                  out->next = NULL;
                }
                /* END OF PATCH */
 
        Com_sprintf (name, sizeof(name), "textures/%s.wal", in->texture);
        out->image = R_FindImage (name, it_wall);
        if (!out->image)
        {
            out->image = r_notexture_mip; // texture not found
            out->flags = 0;
        }
    }
 
    // count animation frames
    for (i=0 ; i<count ; i++)
    {
        out = &loadmodel->texinfo[i];
        out->numframes = 1;
        for (step = out->next ; step && step != out ; step=step->next)
            out->numframes++;
    }
}
 
/*
================
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 (s->extents[i] < 16)
            s->extents[i] = 16; // take at least one cache block
        if ( !(tex->flags & (SURF_WARP|SURF_SKY)) && s->extents[i] > 256)
            ri.Sys_Error (ERR_DROP,"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))
        ri.Sys_Error (ERR_DROP,"MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
    count = l->filelen / sizeof(*in);
    out = Hunk_Alloc ( (count+6)*sizeof(*out)); // extra for skybox
 
    loadmodel->surfaces = out;
    loadmodel->numsurfaces = count;
 
    for ( surfnum=0 ; surfnum<count ; surfnum++, in++, out++)
    {
        out->firstedge = LittleLong(in->firstedge);
        out->numedges = LittleShort(in->numedges);      
        if (out->numedges < 3)
            ri.Sys_Error (ERR_DROP,"Surface with %s edges", out->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 is converted from 24 bit on disk to 8 bit
 
        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/3;
        
    // set the drawing flags flag
        
        if (!out->texinfo->image)
            continue;
        if (out->texinfo->flags & SURF_SKY)
        {
            out->flags |= SURF_DRAWSKY;
            continue;
        }
        
        if (out->texinfo->flags & SURF_WARP)
        {
            out->flags |= SURF_DRAWTURB;
            for (i=0 ; i<2 ; i++)
            {
                out->extents[i] = 16384;
                out->texturemins[i] = -8192;
            }
            continue;
        }
//==============
//PGM
        // this marks flowing surfaces as turbulent, but with the new
        // SURF_FLOW flag.
        if (out->texinfo->flags & SURF_FLOWING)
        {
            out->flags |= SURF_DRAWTURB | SURF_FLOW;
            for (i=0 ; i<2 ; i++)
            {
                out->extents[i] = 16384;
                out->texturemins[i] = -8192;
            }
            continue;
        }
//PGM
//==============
    }
}
 
 
/*
=================
Mod_SetParent
=================
*/
void Mod_SetParent (mnode_t *node, mnode_t *parent)
{
    node->parent = parent;
    if (node->contents != -1)
        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))
        ri.Sys_Error (ERR_DROP,"MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
    count = l->filelen / sizeof(*in);
    out = Hunk_Alloc ( count*sizeof(*out)); 
 
    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);
        out->contents = CONTENTS_NODE;  // differentiate from leafs
        
        for (j=0 ; j<2 ; j++)
        {
            p = LittleLong (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;
 
    in = (void *)(mod_base + l->fileofs);
    if (l->filelen % sizeof(*in))
        ri.Sys_Error (ERR_DROP,"MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
    count = l->filelen / sizeof(*in);
    out = Hunk_Alloc ( count*sizeof(*out));
 
    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]);
        }
 
        out->contents = LittleLong(in->contents);
        out->cluster = LittleShort(in->cluster);
        out->area = LittleShort(in->area);
 
        out->firstmarksurface = loadmodel->marksurfaces +
            LittleShort(in->firstleafface);
        out->nummarksurfaces = LittleShort(in->numleaffaces);
    }   
}
 
 
/*
=================
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))
        ri.Sys_Error (ERR_DROP,"MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
    count = l->filelen / sizeof(*in);
    out = Hunk_Alloc ( count*sizeof(*out)); 
 
    loadmodel->marksurfaces = out;
    loadmodel->nummarksurfaces = count;
 
    for ( i=0 ; i<count ; i++)
    {
        j = LittleShort(in[i]);
        if (j >= loadmodel->numsurfaces)
            ri.Sys_Error (ERR_DROP,"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))
        ri.Sys_Error (ERR_DROP,"MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
    count = l->filelen / sizeof(*in);
    out = Hunk_Alloc ( (count+24)*sizeof(*out));    // extra for skybox
 
    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))
        ri.Sys_Error (ERR_DROP,"MOD_LoadBmodel: funny lump size in %s",loadmodel->name);
    count = l->filelen / sizeof(*in);
    out = Hunk_Alloc ( (count+6)*sizeof(*out));     // extra for skybox
    
    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;
    dheader_t   *header;
    dmodel_t    *bm;
    
    loadmodel->type = mod_brush;
    if (loadmodel != mod_known)
        ri.Sys_Error (ERR_DROP, "Loaded a brush model after the world");
    
    header = (dheader_t *)buffer;
 
    i = LittleLong (header->version);
    if (i != BSPVERSION)
        ri.Sys_Error (ERR_DROP,"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_LoadVertexes (&header->lumps[LUMP_VERTEXES]);
    Mod_LoadEdges (&header->lumps[LUMP_EDGES]);
    Mod_LoadSurfedges (&header->lumps[LUMP_SURFEDGES]);
    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_LEAFFACES]);
    Mod_LoadVisibility (&header->lumps[LUMP_VISIBILITY]);
    Mod_LoadLeafs (&header->lumps[LUMP_LEAFS]);
    Mod_LoadNodes (&header->lumps[LUMP_NODES]);
    Mod_LoadSubmodels (&header->lumps[LUMP_MODELS]);
    r_numvisleafs = 0;
    R_NumberLeafs (loadmodel->nodes);
    
//
// set up the submodels
//
    for (i=0 ; i<mod->numsubmodels ; i++)
    {
        model_t *starmod;
 
        bm = &mod->submodels[i];
        starmod = &mod_inline[i];
 
        *starmod = *loadmodel;
        
        starmod->firstmodelsurface = bm->firstface;
        starmod->nummodelsurfaces = bm->numfaces;
        starmod->firstnode = bm->headnode;
        if (starmod->firstnode >= loadmodel->numnodes)
            ri.Sys_Error (ERR_DROP, "Inline model %i has bad firstnode", i);
 
        VectorCopy (bm->maxs, starmod->maxs);
        VectorCopy (bm->mins, starmod->mins);
    
        if (i == 0)
            *loadmodel = *starmod;
    }
 
    R_InitSkyBox ();
}
 
/*
==============================================================================
 
ALIAS MODELS
 
==============================================================================
*/
 
/*
=================
Mod_LoadAliasModel
=================
*/
void Mod_LoadAliasModel (model_t *mod, void *buffer)
{
    int                 i, j;
    dmdl_t              *pinmodel, *pheader;
    dstvert_t           *pinst, *poutst;
    dtriangle_t         *pintri, *pouttri;
    daliasframe_t       *pinframe, *poutframe;
    int                 *pincmd, *poutcmd;
    int                 version;
 
    pinmodel = (dmdl_t *)buffer;
 
    version = LittleLong (pinmodel->version);
    if (version != ALIAS_VERSION)
        ri.Sys_Error (ERR_DROP, "%s has wrong version number (%i should be %i)",
                 mod->name, version, ALIAS_VERSION);
 
    pheader = Hunk_Alloc (LittleLong(pinmodel->ofs_end));
    
    // byte swap the header fields and sanity check
    for (i=0 ; i<sizeof(dmdl_t)/4 ; i++)
        ((int *)pheader)[i] = LittleLong (((int *)buffer)[i]);
 
    if (pheader->skinheight > MAX_LBM_HEIGHT)
        ri.Sys_Error (ERR_DROP, "model %s has a skin taller than %d", mod->name,
                   MAX_LBM_HEIGHT);
 
    if (pheader->num_xyz <= 0)
        ri.Sys_Error (ERR_DROP, "model %s has no vertices", mod->name);
 
    if (pheader->num_xyz > MAX_VERTS)
        ri.Sys_Error (ERR_DROP, "model %s has too many vertices", mod->name);
 
    if (pheader->num_st <= 0)
        ri.Sys_Error (ERR_DROP, "model %s has no st vertices", mod->name);
 
    if (pheader->num_tris <= 0)
        ri.Sys_Error (ERR_DROP, "model %s has no triangles", mod->name);
 
    if (pheader->num_frames <= 0)
        ri.Sys_Error (ERR_DROP, "model %s has no frames", mod->name);
 
//
// load base s and t vertices (not used in gl version)
//
    pinst = (dstvert_t *) ((byte *)pinmodel + pheader->ofs_st);
    poutst = (dstvert_t *) ((byte *)pheader + pheader->ofs_st);
 
    for (i=0 ; i<pheader->num_st ; i++)
    {
        poutst[i].s = LittleShort (pinst[i].s);
        poutst[i].t = LittleShort (pinst[i].t);
    }
 
//
// load triangle lists
//
    pintri = (dtriangle_t *) ((byte *)pinmodel + pheader->ofs_tris);
    pouttri = (dtriangle_t *) ((byte *)pheader + pheader->ofs_tris);
 
    for (i=0 ; i<pheader->num_tris ; i++)
    {
        for (j=0 ; j<3 ; j++)
        {
            pouttri[i].index_xyz[j] = LittleShort (pintri[i].index_xyz[j]);
            pouttri[i].index_st[j] = LittleShort (pintri[i].index_st[j]);
        }
    }
 
//
// load the frames
//
    for (i=0 ; i<pheader->num_frames ; i++)
    {
        pinframe = (daliasframe_t *) ((byte *)pinmodel 
            + pheader->ofs_frames + i * pheader->framesize);
        poutframe = (daliasframe_t *) ((byte *)pheader 
            + pheader->ofs_frames + i * pheader->framesize);
 
        memcpy (poutframe->name, pinframe->name, sizeof(poutframe->name));
        for (j=0 ; j<3 ; j++)
        {
            poutframe->scale[j] = LittleFloat (pinframe->scale[j]);
            poutframe->translate[j] = LittleFloat (pinframe->translate[j]);
        }
        // verts are all 8 bit, so no swapping needed
        memcpy (poutframe->verts, pinframe->verts, 
            pheader->num_xyz*sizeof(dtrivertx_t));
 
    }
 
    mod->type = mod_alias;
 
    //
    // load the glcmds
    //
    pincmd = (int *) ((byte *)pinmodel + pheader->ofs_glcmds);
    poutcmd = (int *) ((byte *)pheader + pheader->ofs_glcmds);
    for (i=0 ; i<pheader->num_glcmds ; i++)
        poutcmd[i] = LittleLong (pincmd[i]);
 
 
    // register all skins
    memcpy ((char *)pheader + pheader->ofs_skins, (char *)pinmodel + pheader->ofs_skins,
        pheader->num_skins*MAX_SKINNAME);
    for (i=0 ; i<pheader->num_skins ; i++)
    {
        mod->skins[i] = R_FindImage ((char *)pheader + pheader->ofs_skins + i*MAX_SKINNAME, it_skin);
    }
}
 
/*
==============================================================================
 
SPRITE MODELS
 
==============================================================================
*/
 
/*
=================
Mod_LoadSpriteModel
=================
*/
void Mod_LoadSpriteModel (model_t *mod, void *buffer)
{
    dsprite_t   *sprin, *sprout;
    int         i;
 
    sprin = (dsprite_t *)buffer;
    sprout = Hunk_Alloc (modfilelen);
 
    sprout->ident = LittleLong (sprin->ident);
    sprout->version = LittleLong (sprin->version);
    sprout->numframes = LittleLong (sprin->numframes);
 
    if (sprout->version != SPRITE_VERSION)
        ri.Sys_Error (ERR_DROP, "%s has wrong version number (%i should be %i)",
                 mod->name, sprout->version, SPRITE_VERSION);
 
    if (sprout->numframes > MAX_MD2SKINS)
        ri.Sys_Error (ERR_DROP, "%s has too many frames (%i > %i)",
                 mod->name, sprout->numframes, MAX_MD2SKINS);
 
    // byte swap everything
    for (i=0 ; i<sprout->numframes ; i++)
    {
        sprout->frames[i].width = LittleLong (sprin->frames[i].width);
        sprout->frames[i].height = LittleLong (sprin->frames[i].height);
        sprout->frames[i].origin_x = LittleLong (sprin->frames[i].origin_x);
        sprout->frames[i].origin_y = LittleLong (sprin->frames[i].origin_y);
        memcpy (sprout->frames[i].name, sprin->frames[i].name, MAX_SKINNAME);
        mod->skins[i] = R_FindImage (sprout->frames[i].name, it_sprite);
    }
 
    mod->type = mod_sprite;
}
 
//=============================================================================
 
/*
@@@@@@@@@@@@@@@@@@@@@
R_BeginRegistration
 
Specifies the model that will be used as the world
@@@@@@@@@@@@@@@@@@@@@
*/
void R_BeginRegistration (char *model)
{
    char    fullname[MAX_QPATH];
    cvar_t  *flushmap;
 
    registration_sequence++;
    r_oldviewcluster = -1;      // force markleafs
    Com_sprintf (fullname, sizeof(fullname), "maps/%s.bsp", model);
 
    D_FlushCaches ();
    // explicitly free the old map if different
    // this guarantees that mod_known[0] is the world map
    flushmap = ri.Cvar_Get ("flushmap", "0", 0);
    if ( strcmp(mod_known[0].name, fullname) || flushmap->value)
        Mod_Free (&mod_known[0]);
    r_worldmodel = R_RegisterModel (fullname);
    R_NewMap ();
}
 
 
/*
@@@@@@@@@@@@@@@@@@@@@
R_RegisterModel
 
@@@@@@@@@@@@@@@@@@@@@
*/
struct model_s *R_RegisterModel (char *name)
{
    model_t *mod;
    int     i;
    dsprite_t   *sprout;
    dmdl_t      *pheader;
 
    mod = Mod_ForName (name, false);
    if (mod)
    {
        mod->registration_sequence = registration_sequence;
 
        // register any images used by the models
        if (mod->type == mod_sprite)
        {
            sprout = (dsprite_t *)mod->extradata;
            for (i=0 ; i<sprout->numframes ; i++)
                mod->skins[i] = R_FindImage (sprout->frames[i].name, it_sprite);
        }
        else if (mod->type == mod_alias)
        {
            pheader = (dmdl_t *)mod->extradata;
            for (i=0 ; i<pheader->num_skins ; i++)
                mod->skins[i] = R_FindImage ((char *)pheader + pheader->ofs_skins + i*MAX_SKINNAME, it_skin);
//PGM
            mod->numframes = pheader->num_frames;
//PGM
        }
        else if (mod->type == mod_brush)
        {
            for (i=0 ; i<mod->numtexinfo ; i++)
                mod->texinfo[i].image->registration_sequence = registration_sequence;
        }
    }
    return mod;
}
 
/*
@@@@@@@@@@@@@@@@@@@@@
R_EndRegistration
 
@@@@@@@@@@@@@@@@@@@@@
*/
void R_EndRegistration (void)
{
    int     i;
    model_t *mod;
 
    for (i=0, mod=mod_known ; i<mod_numknown ; i++, mod++)
    {
        if (!mod->name[0])
            continue;
        if (mod->registration_sequence != registration_sequence)
        {   // don't need this model
            Hunk_Free (mod->extradata);
            memset (mod, 0, sizeof(*mod));
        }
        else
        {   // make sure it is paged in
            Com_PageInMemory (mod->extradata, mod->extradatasize);
        }
    }
 
    R_FreeUnusedImages ();
}
 
 
//=============================================================================
 
/*
================
Mod_Free
================
*/
void Mod_Free (model_t *mod)
{
    Hunk_Free (mod->extradata);
    memset (mod, 0, sizeof(*mod));
}
 
/*
================
Mod_FreeAll
================
*/
void Mod_FreeAll (void)
{
    int     i;
 
    for (i=0 ; i<mod_numknown ; i++)
    {
        if (mod_known[i].extradatasize)
            Mod_Free (&mod_known[i]);
    }
}