cm_load.c

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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code 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.

Quake III Arena source code 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 Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
// cmodel.c -- model loading

#include "cm_local.h"

#ifdef BSPC

#include "../bspc/l_qfiles.h"

void SetPlaneSignbits (cplane_t *out) {
    int bits, j;

    // for fast box on planeside test
    bits = 0;
    for (j=0 ; j<3 ; j++) {
        if (out->normal[j] < 0) {
            bits |= 1<<j;
        }
    }
    out->signbits = bits;
}
#endif //BSPC

// to allow boxes to be treated as brush models, we allocate
// some extra indexes along with those needed by the map
#define BOX_BRUSHES     1
#define BOX_SIDES       6
#define BOX_LEAFS       2
#define BOX_PLANES      12

#define LL(x) x=LittleLong(x)


clipMap_t   cm;
int         c_pointcontents;
int         c_traces, c_brush_traces, c_patch_traces;


byte        *cmod_base;

#ifndef BSPC
cvar_t      *cm_noAreas;
cvar_t      *cm_noCurves;
cvar_t      *cm_playerCurveClip;
#endif

cmodel_t    box_model;
cplane_t    *box_planes;
cbrush_t    *box_brush;



void    CM_InitBoxHull (void);
void    CM_FloodAreaConnections (void);


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

                    MAP LOADING

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

/*
=================
CMod_LoadShaders
=================
*/
void CMod_LoadShaders( lump_t *l ) {
    dshader_t   *in, *out;
    int         i, count;

    in = (void *)(cmod_base + l->fileofs);
    if (l->filelen % sizeof(*in)) {
        Com_Error (ERR_DROP, "CMod_LoadShaders: funny lump size");
    }
    count = l->filelen / sizeof(*in);

    if (count < 1) {
        Com_Error (ERR_DROP, "Map with no shaders");
    }
    cm.shaders = Hunk_Alloc( count * sizeof( *cm.shaders ), h_high );
    cm.numShaders = count;

    Com_Memcpy( cm.shaders, in, count * sizeof( *cm.shaders ) );

    out = cm.shaders;
    for ( i=0 ; i<count ; i++, in++, out++ ) {
        out->contentFlags = LittleLong( out->contentFlags );
        out->surfaceFlags = LittleLong( out->surfaceFlags );
    }
}


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

    in = (void *)(cmod_base + l->fileofs);
    if (l->filelen % sizeof(*in))
        Com_Error (ERR_DROP, "CMod_LoadSubmodels: funny lump size");
    count = l->filelen / sizeof(*in);

    if (count < 1)
        Com_Error (ERR_DROP, "Map with no models");
    cm.cmodels = Hunk_Alloc( count * sizeof( *cm.cmodels ), h_high );
    cm.numSubModels = count;

    if ( count > MAX_SUBMODELS ) {
        Com_Error( ERR_DROP, "MAX_SUBMODELS exceeded" );
    }

    for ( i=0 ; i<count ; i++, in++, out++)
    {
        out = &cm.cmodels[i];

        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;
        }

        if ( i == 0 ) {
            continue;   // world model doesn't need other info
        }

        // make a "leaf" just to hold the model's brushes and surfaces
        out->leaf.numLeafBrushes = LittleLong( in->numBrushes );
        indexes = Hunk_Alloc( out->leaf.numLeafBrushes * 4, h_high );
        out->leaf.firstLeafBrush = indexes - cm.leafbrushes;
        for ( j = 0 ; j < out->leaf.numLeafBrushes ; j++ ) {
            indexes[j] = LittleLong( in->firstBrush ) + j;
        }

        out->leaf.numLeafSurfaces = LittleLong( in->numSurfaces );
        indexes = Hunk_Alloc( out->leaf.numLeafSurfaces * 4, h_high );
        out->leaf.firstLeafSurface = indexes - cm.leafsurfaces;
        for ( j = 0 ; j < out->leaf.numLeafSurfaces ; j++ ) {
            indexes[j] = LittleLong( in->firstSurface ) + j;
        }
    }
}


/*
=================
CMod_LoadNodes

=================
*/
void CMod_LoadNodes( lump_t *l ) {
    dnode_t     *in;
    int         child;
    cNode_t     *out;
    int         i, j, count;
    
    in = (void *)(cmod_base + l->fileofs);
    if (l->filelen % sizeof(*in))
        Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
    count = l->filelen / sizeof(*in);

    if (count < 1)
        Com_Error (ERR_DROP, "Map has no nodes");
    cm.nodes = Hunk_Alloc( count * sizeof( *cm.nodes ), h_high );
    cm.numNodes = count;

    out = cm.nodes;

    for (i=0 ; i<count ; i++, out++, in++)
    {
        out->plane = cm.planes + LittleLong( in->planeNum );
        for (j=0 ; j<2 ; j++)
        {
            child = LittleLong (in->children[j]);
            out->children[j] = child;
        }
    }

}

/*
=================
CM_BoundBrush

=================
*/
void CM_BoundBrush( cbrush_t *b ) {
    b->bounds[0][0] = -b->sides[0].plane->dist;
    b->bounds[1][0] = b->sides[1].plane->dist;

    b->bounds[0][1] = -b->sides[2].plane->dist;
    b->bounds[1][1] = b->sides[3].plane->dist;

    b->bounds[0][2] = -b->sides[4].plane->dist;
    b->bounds[1][2] = b->sides[5].plane->dist;
}


/*
=================
CMod_LoadBrushes

=================
*/
void CMod_LoadBrushes( lump_t *l ) {
    dbrush_t    *in;
    cbrush_t    *out;
    int         i, count;

    in = (void *)(cmod_base + l->fileofs);
    if (l->filelen % sizeof(*in)) {
        Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
    }
    count = l->filelen / sizeof(*in);

    cm.brushes = Hunk_Alloc( ( BOX_BRUSHES + count ) * sizeof( *cm.brushes ), h_high );
    cm.numBrushes = count;

    out = cm.brushes;

    for ( i=0 ; i<count ; i++, out++, in++ ) {
        out->sides = cm.brushsides + LittleLong(in->firstSide);
        out->numsides = LittleLong(in->numSides);

        out->shaderNum = LittleLong( in->shaderNum );
        if ( out->shaderNum < 0 || out->shaderNum >= cm.numShaders ) {
            Com_Error( ERR_DROP, "CMod_LoadBrushes: bad shaderNum: %i", out->shaderNum );
        }
        out->contents = cm.shaders[out->shaderNum].contentFlags;

        CM_BoundBrush( out );
    }

}

/*
=================
CMod_LoadLeafs
=================
*/
void CMod_LoadLeafs (lump_t *l)
{
    int         i;
    cLeaf_t     *out;
    dleaf_t     *in;
    int         count;
    
    in = (void *)(cmod_base + l->fileofs);
    if (l->filelen % sizeof(*in))
        Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
    count = l->filelen / sizeof(*in);

    if (count < 1)
        Com_Error (ERR_DROP, "Map with no leafs");

    cm.leafs = Hunk_Alloc( ( BOX_LEAFS + count ) * sizeof( *cm.leafs ), h_high );
    cm.numLeafs = count;

    out = cm.leafs; 
    for ( i=0 ; i<count ; i++, in++, out++)
    {
        out->cluster = LittleLong (in->cluster);
        out->area = LittleLong (in->area);
        out->firstLeafBrush = LittleLong (in->firstLeafBrush);
        out->numLeafBrushes = LittleLong (in->numLeafBrushes);
        out->firstLeafSurface = LittleLong (in->firstLeafSurface);
        out->numLeafSurfaces = LittleLong (in->numLeafSurfaces);

        if (out->cluster >= cm.numClusters)
            cm.numClusters = out->cluster + 1;
        if (out->area >= cm.numAreas)
            cm.numAreas = out->area + 1;
    }

    cm.areas = Hunk_Alloc( cm.numAreas * sizeof( *cm.areas ), h_high );
    cm.areaPortals = Hunk_Alloc( cm.numAreas * cm.numAreas * sizeof( *cm.areaPortals ), h_high );
}

/*
=================
CMod_LoadPlanes
=================
*/
void CMod_LoadPlanes (lump_t *l)
{
    int         i, j;
    cplane_t    *out;
    dplane_t    *in;
    int         count;
    int         bits;
    
    in = (void *)(cmod_base + l->fileofs);
    if (l->filelen % sizeof(*in))
        Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
    count = l->filelen / sizeof(*in);

    if (count < 1)
        Com_Error (ERR_DROP, "Map with no planes");
    cm.planes = Hunk_Alloc( ( BOX_PLANES + count ) * sizeof( *cm.planes ), h_high );
    cm.numPlanes = count;

    out = cm.planes;    

    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 = PlaneTypeForNormal( out->normal );
        out->signbits = bits;
    }
}

/*
=================
CMod_LoadLeafBrushes
=================
*/
void CMod_LoadLeafBrushes (lump_t *l)
{
    int         i;
    int         *out;
    int         *in;
    int         count;
    
    in = (void *)(cmod_base + l->fileofs);
    if (l->filelen % sizeof(*in))
        Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
    count = l->filelen / sizeof(*in);

    cm.leafbrushes = Hunk_Alloc( (count + BOX_BRUSHES) * sizeof( *cm.leafbrushes ), h_high );
    cm.numLeafBrushes = count;

    out = cm.leafbrushes;

    for ( i=0 ; i<count ; i++, in++, out++) {
        *out = LittleLong (*in);
    }
}

/*
=================
CMod_LoadLeafSurfaces
=================
*/
void CMod_LoadLeafSurfaces( lump_t *l )
{
    int         i;
    int         *out;
    int         *in;
    int         count;
    
    in = (void *)(cmod_base + l->fileofs);
    if (l->filelen % sizeof(*in))
        Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
    count = l->filelen / sizeof(*in);

    cm.leafsurfaces = Hunk_Alloc( count * sizeof( *cm.leafsurfaces ), h_high );
    cm.numLeafSurfaces = count;

    out = cm.leafsurfaces;

    for ( i=0 ; i<count ; i++, in++, out++) {
        *out = LittleLong (*in);
    }
}

/*
=================
CMod_LoadBrushSides
=================
*/
void CMod_LoadBrushSides (lump_t *l)
{
    int             i;
    cbrushside_t    *out;
    dbrushside_t    *in;
    int             count;
    int             num;

    in = (void *)(cmod_base + l->fileofs);
    if ( l->filelen % sizeof(*in) ) {
        Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
    }
    count = l->filelen / sizeof(*in);

    cm.brushsides = Hunk_Alloc( ( BOX_SIDES + count ) * sizeof( *cm.brushsides ), h_high );
    cm.numBrushSides = count;

    out = cm.brushsides;    

    for ( i=0 ; i<count ; i++, in++, out++) {
        num = LittleLong( in->planeNum );
        out->plane = &cm.planes[num];
        out->shaderNum = LittleLong( in->shaderNum );
        if ( out->shaderNum < 0 || out->shaderNum >= cm.numShaders ) {
            Com_Error( ERR_DROP, "CMod_LoadBrushSides: bad shaderNum: %i", out->shaderNum );
        }
        out->surfaceFlags = cm.shaders[out->shaderNum].surfaceFlags;
    }
}


/*
=================
CMod_LoadEntityString
=================
*/
void CMod_LoadEntityString( lump_t *l ) {
    cm.entityString = Hunk_Alloc( l->filelen, h_high );
    cm.numEntityChars = l->filelen;
    Com_Memcpy (cm.entityString, cmod_base + l->fileofs, l->filelen);
}

/*
=================
CMod_LoadVisibility
=================
*/
#define VIS_HEADER  8
void CMod_LoadVisibility( lump_t *l ) {
    int     len;
    byte    *buf;

    len = l->filelen;
    if ( !len ) {
        cm.clusterBytes = ( cm.numClusters + 31 ) & ~31;
        cm.visibility = Hunk_Alloc( cm.clusterBytes, h_high );
        Com_Memset( cm.visibility, 255, cm.clusterBytes );
        return;
    }
    buf = cmod_base + l->fileofs;

    cm.vised = qtrue;
    cm.visibility = Hunk_Alloc( len, h_high );
    cm.numClusters = LittleLong( ((int *)buf)[0] );
    cm.clusterBytes = LittleLong( ((int *)buf)[1] );
    Com_Memcpy (cm.visibility, buf + VIS_HEADER, len - VIS_HEADER );
}

//==================================================================


/*
=================
CMod_LoadPatches
=================
*/
#define MAX_PATCH_VERTS     1024
void CMod_LoadPatches( lump_t *surfs, lump_t *verts ) {
    drawVert_t  *dv, *dv_p;
    dsurface_t  *in;
    int         count;
    int         i, j;
    int         c;
    cPatch_t    *patch;
    vec3_t      points[MAX_PATCH_VERTS];
    int         width, height;
    int         shaderNum;

    in = (void *)(cmod_base + surfs->fileofs);
    if (surfs->filelen % sizeof(*in))
        Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
    cm.numSurfaces = count = surfs->filelen / sizeof(*in);
    cm.surfaces = Hunk_Alloc( cm.numSurfaces * sizeof( cm.surfaces[0] ), h_high );

    dv = (void *)(cmod_base + verts->fileofs);
    if (verts->filelen % sizeof(*dv))
        Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");

    // scan through all the surfaces, but only load patches,
    // not planar faces
    for ( i = 0 ; i < count ; i++, in++ ) {
        if ( LittleLong( in->surfaceType ) != MST_PATCH ) {
            continue;       // ignore other surfaces
        }
        // FIXME: check for non-colliding patches

        cm.surfaces[ i ] = patch = Hunk_Alloc( sizeof( *patch ), h_high );

        // load the full drawverts onto the stack
        width = LittleLong( in->patchWidth );
        height = LittleLong( in->patchHeight );
        c = width * height;
        if ( c > MAX_PATCH_VERTS ) {
            Com_Error( ERR_DROP, "ParseMesh: MAX_PATCH_VERTS" );
        }

        dv_p = dv + LittleLong( in->firstVert );
        for ( j = 0 ; j < c ; j++, dv_p++ ) {
            points[j][0] = LittleFloat( dv_p->xyz[0] );
            points[j][1] = LittleFloat( dv_p->xyz[1] );
            points[j][2] = LittleFloat( dv_p->xyz[2] );
        }

        shaderNum = LittleLong( in->shaderNum );
        patch->contents = cm.shaders[shaderNum].contentFlags;
        patch->surfaceFlags = cm.shaders[shaderNum].surfaceFlags;

        // create the internal facet structure
        patch->pc = CM_GeneratePatchCollide( width, height, points );
    }
}

//==================================================================

unsigned CM_LumpChecksum(lump_t *lump) {
    return LittleLong (Com_BlockChecksum (cmod_base + lump->fileofs, lump->filelen));
}

unsigned CM_Checksum(dheader_t *header) {
    unsigned checksums[16];
    checksums[0] = CM_LumpChecksum(&header->lumps[LUMP_SHADERS]);
    checksums[1] = CM_LumpChecksum(&header->lumps[LUMP_LEAFS]);
    checksums[2] = CM_LumpChecksum(&header->lumps[LUMP_LEAFBRUSHES]);
    checksums[3] = CM_LumpChecksum(&header->lumps[LUMP_LEAFSURFACES]);
    checksums[4] = CM_LumpChecksum(&header->lumps[LUMP_PLANES]);
    checksums[5] = CM_LumpChecksum(&header->lumps[LUMP_BRUSHSIDES]);
    checksums[6] = CM_LumpChecksum(&header->lumps[LUMP_BRUSHES]);
    checksums[7] = CM_LumpChecksum(&header->lumps[LUMP_MODELS]);
    checksums[8] = CM_LumpChecksum(&header->lumps[LUMP_NODES]);
    checksums[9] = CM_LumpChecksum(&header->lumps[LUMP_SURFACES]);
    checksums[10] = CM_LumpChecksum(&header->lumps[LUMP_DRAWVERTS]);

    return LittleLong(Com_BlockChecksum(checksums, 11 * 4));
}

/*
==================
CM_LoadMap

Loads in the map and all submodels
==================
*/
void CM_LoadMap( const char *name, qboolean clientload, int *checksum ) {
    int             *buf;
    int             i;
    dheader_t       header;
    int             length;
    static unsigned last_checksum;

    if ( !name || !name[0] ) {
        Com_Error( ERR_DROP, "CM_LoadMap: NULL name" );
    }

#ifndef BSPC
    cm_noAreas = Cvar_Get ("cm_noAreas", "0", CVAR_CHEAT);
    cm_noCurves = Cvar_Get ("cm_noCurves", "0", CVAR_CHEAT);
    cm_playerCurveClip = Cvar_Get ("cm_playerCurveClip", "1", CVAR_ARCHIVE|CVAR_CHEAT );
#endif
    Com_DPrintf( "CM_LoadMap( %s, %i )\n", name, clientload );

    if ( !strcmp( cm.name, name ) && clientload ) {
        *checksum = last_checksum;
        return;
    }

    // free old stuff
    Com_Memset( &cm, 0, sizeof( cm ) );
    CM_ClearLevelPatches();

    if ( !name[0] ) {
        cm.numLeafs = 1;
        cm.numClusters = 1;
        cm.numAreas = 1;
        cm.cmodels = Hunk_Alloc( sizeof( *cm.cmodels ), h_high );
        *checksum = 0;
        return;
    }

    //
    // load the file
    //
#ifndef BSPC
    length = FS_ReadFile( name, (void **)&buf );
#else
    length = LoadQuakeFile((quakefile_t *) name, (void **)&buf);
#endif

    if ( !buf ) {
        Com_Error (ERR_DROP, "Couldn't load %s", name);
    }

    last_checksum = LittleLong (Com_BlockChecksum (buf, length));
    *checksum = last_checksum;

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

    if ( header.version != BSP_VERSION ) {
        Com_Error (ERR_DROP, "CM_LoadMap: %s has wrong version number (%i should be %i)"
        , name, header.version, BSP_VERSION );
    }

    cmod_base = (byte *)buf;

    // load into heap
    CMod_LoadShaders( &header.lumps[LUMP_SHADERS] );
    CMod_LoadLeafs (&header.lumps[LUMP_LEAFS]);
    CMod_LoadLeafBrushes (&header.lumps[LUMP_LEAFBRUSHES]);
    CMod_LoadLeafSurfaces (&header.lumps[LUMP_LEAFSURFACES]);
    CMod_LoadPlanes (&header.lumps[LUMP_PLANES]);
    CMod_LoadBrushSides (&header.lumps[LUMP_BRUSHSIDES]);
    CMod_LoadBrushes (&header.lumps[LUMP_BRUSHES]);
    CMod_LoadSubmodels (&header.lumps[LUMP_MODELS]);
    CMod_LoadNodes (&header.lumps[LUMP_NODES]);
    CMod_LoadEntityString (&header.lumps[LUMP_ENTITIES]);
    CMod_LoadVisibility( &header.lumps[LUMP_VISIBILITY] );
    CMod_LoadPatches( &header.lumps[LUMP_SURFACES], &header.lumps[LUMP_DRAWVERTS] );

    // we are NOT freeing the file, because it is cached for the ref
    FS_FreeFile (buf);

    CM_InitBoxHull ();

    CM_FloodAreaConnections ();

    // allow this to be cached if it is loaded by the server
    if ( !clientload ) {
        Q_strncpyz( cm.name, name, sizeof( cm.name ) );
    }
}

/*
==================
CM_ClearMap
==================
*/
void CM_ClearMap( void ) {
    Com_Memset( &cm, 0, sizeof( cm ) );
    CM_ClearLevelPatches();
}

/*
==================
CM_ClipHandleToModel
==================
*/
cmodel_t    *CM_ClipHandleToModel( clipHandle_t handle ) {
    if ( handle < 0 ) {
        Com_Error( ERR_DROP, "CM_ClipHandleToModel: bad handle %i", handle );
    }
    if ( handle < cm.numSubModels ) {
        return &cm.cmodels[handle];
    }
    if ( handle == BOX_MODEL_HANDLE ) {
        return &box_model;
    }
    if ( handle < MAX_SUBMODELS ) {
        Com_Error( ERR_DROP, "CM_ClipHandleToModel: bad handle %i < %i < %i", 
            cm.numSubModels, handle, MAX_SUBMODELS );
    }
    Com_Error( ERR_DROP, "CM_ClipHandleToModel: bad handle %i", handle + MAX_SUBMODELS );

    return NULL;

}

/*
==================
CM_InlineModel
==================
*/
clipHandle_t    CM_InlineModel( int index ) {
    if ( index < 0 || index >= cm.numSubModels ) {
        Com_Error (ERR_DROP, "CM_InlineModel: bad number");
    }
    return index;
}

int     CM_NumClusters( void ) {
    return cm.numClusters;
}

int     CM_NumInlineModels( void ) {
    return cm.numSubModels;
}

char    *CM_EntityString( void ) {
    return cm.entityString;
}

int     CM_LeafCluster( int leafnum ) {
    if (leafnum < 0 || leafnum >= cm.numLeafs) {
        Com_Error (ERR_DROP, "CM_LeafCluster: bad number");
    }
    return cm.leafs[leafnum].cluster;
}

int     CM_LeafArea( int leafnum ) {
    if ( leafnum < 0 || leafnum >= cm.numLeafs ) {
        Com_Error (ERR_DROP, "CM_LeafArea: bad number");
    }
    return cm.leafs[leafnum].area;
}

//=======================================================================


/*
===================
CM_InitBoxHull

Set up the planes and nodes so that the six floats of a bounding box
can just be stored out and get a proper clipping hull structure.
===================
*/
void CM_InitBoxHull (void)
{
    int         i;
    int         side;
    cplane_t    *p;
    cbrushside_t    *s;

    box_planes = &cm.planes[cm.numPlanes];

    box_brush = &cm.brushes[cm.numBrushes];
    box_brush->numsides = 6;
    box_brush->sides = cm.brushsides + cm.numBrushSides;
    box_brush->contents = CONTENTS_BODY;

    box_model.leaf.numLeafBrushes = 1;
//  box_model.leaf.firstLeafBrush = cm.numBrushes;
    box_model.leaf.firstLeafBrush = cm.numLeafBrushes;
    cm.leafbrushes[cm.numLeafBrushes] = cm.numBrushes;

    for (i=0 ; i<6 ; i++)
    {
        side = i&1;

        // brush sides
        s = &cm.brushsides[cm.numBrushSides+i];
        s->plane =  cm.planes + (cm.numPlanes+i*2+side);
        s->surfaceFlags = 0;

        // planes
        p = &box_planes[i*2];
        p->type = i>>1;
        p->signbits = 0;
        VectorClear (p->normal);
        p->normal[i>>1] = 1;

        p = &box_planes[i*2+1];
        p->type = 3 + (i>>1);
        p->signbits = 0;
        VectorClear (p->normal);
        p->normal[i>>1] = -1;

        SetPlaneSignbits( p );
    }   
}

/*
===================
CM_TempBoxModel

To keep everything totally uniform, bounding boxes are turned into small
BSP trees instead of being compared directly.
Capsules are handled differently though.
===================
*/
clipHandle_t CM_TempBoxModel( const vec3_t mins, const vec3_t maxs, int capsule ) {

    VectorCopy( mins, box_model.mins );
    VectorCopy( maxs, box_model.maxs );

    if ( capsule ) {
        return CAPSULE_MODEL_HANDLE;
    }

    box_planes[0].dist = maxs[0];
    box_planes[1].dist = -maxs[0];
    box_planes[2].dist = mins[0];
    box_planes[3].dist = -mins[0];
    box_planes[4].dist = maxs[1];
    box_planes[5].dist = -maxs[1];
    box_planes[6].dist = mins[1];
    box_planes[7].dist = -mins[1];
    box_planes[8].dist = maxs[2];
    box_planes[9].dist = -maxs[2];
    box_planes[10].dist = mins[2];
    box_planes[11].dist = -mins[2];

    VectorCopy( mins, box_brush->bounds[0] );
    VectorCopy( maxs, box_brush->bounds[1] );

    return BOX_MODEL_HANDLE;
}

/*
===================
CM_ModelBounds
===================
*/
void CM_ModelBounds( clipHandle_t model, vec3_t mins, vec3_t maxs ) {
    cmodel_t    *cmod;

    cmod = CM_ClipHandleToModel( model );
    VectorCopy( cmod->mins, mins );
    VectorCopy( cmod->maxs, maxs );
}

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