// cmodel.c -- model loading

#include "cm_local.h"

#ifdef BSPC
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 = (dshader_t *)(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 = (dshader_t *) Z_Malloc( count * sizeof( *cm.shaders ), TAG_BSP, qfalse);
	cm.numShaders = count;

	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 = (dmodel_t *)(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");
	}

	if ( count > MAX_SUBMODELS ) {
		Com_Error( ERR_DROP, "MAX_SUBMODELS (%d) exceeded by %d", MAX_SUBMODELS, count-MAX_SUBMODELS );
	}

	cm.cmodels = (struct cmodel_s *) Z_Malloc( count * sizeof( *cm.cmodels ), TAG_BSP, qtrue );
	cm.numSubModels = count;

	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 = (int *) Z_Malloc( out->leaf.numLeafBrushes * 4, TAG_BSP, qfalse);
		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 = (int *) Z_Malloc( out->leaf.numLeafSurfaces * 4, TAG_BSP, qfalse);
		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 = (dnode_t *)(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 = (cNode_t *) Z_Malloc( count * sizeof( *cm.nodes ), TAG_BSP, qfalse);
	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 = (dbrush_t *)(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 = (cbrush_t *) Z_Malloc( ( BOX_BRUSHES + count ) * sizeof( *cm.brushes ), TAG_BSP, qfalse);
	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;
		//TEMP HACK: for water that cuts vis but is not solid!!!
		if ( cm.shaders[out->shaderNum].surfaceFlags & SURF_SLICK )
		{
			out->contents &= ~CONTENTS_SOLID;
		}

		CM_BoundBrush( out );
	}

}

/*
=================
CMod_LoadLeafs
=================
*/
void CMod_LoadLeafs (lump_t *l)
{
	int			i;
	cLeaf_t		*out;
	dleaf_t 	*in;
	int			count;
	
	in = (dleaf_t *)(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 = (cLeaf_t *) Z_Malloc( ( BOX_LEAFS + count ) * sizeof( *cm.leafs ), TAG_BSP, qfalse);
	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 = (cArea_t *) Z_Malloc( cm.numAreas * sizeof( *cm.areas ), TAG_BSP, qtrue );
	cm.areaPortals = (int *) Z_Malloc( cm.numAreas * cm.numAreas * sizeof( *cm.areaPortals ), TAG_BSP, qtrue );
}

/*
=================
CMod_LoadPlanes
=================
*/
void CMod_LoadPlanes (lump_t *l)
{
	int			i, j;
	cplane_t	*out;
	dplane_t 	*in;
	int			count;
	int			bits;
	
	in = (dplane_t *)(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 = (struct cplane_s *) Z_Malloc( ( BOX_PLANES + count ) * sizeof( *cm.planes ), TAG_BSP, qfalse);
	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 = (int *)(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 = (int *) Z_Malloc( ( BOX_BRUSHES + count ) * sizeof( *cm.leafbrushes ), TAG_BSP, qfalse);
	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 = (int *)(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 = (int *) Z_Malloc( count * sizeof( *cm.leafsurfaces ), TAG_BSP, qfalse);
	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 = (dbrushside_t *)(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 = (cbrushside_t *) Z_Malloc( ( BOX_SIDES + count ) * sizeof( *cm.brushsides ), TAG_BSP, qfalse);
	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 = (char *) Z_Malloc( l->filelen, TAG_BSP, qfalse);
	cm.numEntityChars = l->filelen;
	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 = (unsigned char *) Z_Malloc( cm.clusterBytes, TAG_BSP, qfalse);
		memset( cm.visibility, 255, cm.clusterBytes );
		return;
	}
	buf = cmod_base + l->fileofs;

	cm.vised = qtrue;
	cm.visibility = (unsigned char *) Z_Malloc( len, TAG_BSP, qtrue );
	cm.numClusters = LittleLong( ((int *)buf)[0] );
	cm.clusterBytes = LittleLong( ((int *)buf)[1] );
	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 ) {
	mapVert_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 = (dsurface_t *)(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 = (cPatch_t **) Z_Malloc( cm.numSurfaces * sizeof( cm.surfaces[0] ), TAG_BSP, qtrue );

	dv = (mapVert_t *)(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 = (cPatch_t *) Z_Malloc( sizeof( *patch ), TAG_BSP, qtrue );

		// 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 );
	}
}

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

#ifdef BSPC
/*
==================
CM_FreeMap

Free any loaded map and all submodels
==================
*/
void CM_FreeMap(void) {
	memset( &cm, 0, sizeof( cm ) );
	Hunk_ClearHigh();
	CM_ClearLevelPatches();
}
#endif //BSPC

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 *gpvCachedMapDiskImage = NULL;
char  gsCachedMapDiskImage[MAX_QPATH];
qboolean gbUsingCachedMapDataRightNow = qfalse;	// if true, signifies that you can't delete this at the moment!! (used during z_malloc()-fail recovery attempt)

// called in response to a "devmapbsp blah" or "devmapall blah" command, do NOT use inside CM_Load unless you pass in qtrue
//
// new bool return used to see if anything was freed, used during z_malloc failure re-try
//
qboolean CM_DeleteCachedMap(qboolean bGuaranteedOkToDelete)
{
	qboolean bActuallyFreedSomething = qfalse;

	if (bGuaranteedOkToDelete || !gbUsingCachedMapDataRightNow)
	{
		// dump cached disk image...
		//
		if (gpvCachedMapDiskImage)
		{
			Z_Free(	gpvCachedMapDiskImage );
					gpvCachedMapDiskImage = NULL;

			bActuallyFreedSomething = qtrue;
		}
		gsCachedMapDiskImage[0] = '\0';
		
		// force map loader to ignore cached internal BSP structures for next level CM_LoadMap() call...
		//
		cm.name[0] = '\0';
	}

	return bActuallyFreedSomething;
}

static void CM_LoadMap_Actual( const char *name, qboolean clientload, int *checksum ) {
	const int		*buf;
	int				i;
	dheader_t		header;
	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;
	}

	// if there was a cached disk image but the name was empty (ie ERR_DROP happened) or just doesn't match
	//	the current name, then ditch it...
	//	
	if (gpvCachedMapDiskImage && 
		(gsCachedMapDiskImage[0] == '\0' || strcmp( gsCachedMapDiskImage, name ))
		)
	{
		Z_Free(gpvCachedMapDiskImage);
			   gpvCachedMapDiskImage = NULL;
	   gsCachedMapDiskImage[0] = '\0';
	}

	// if there's a valid map name, and it's the same as last time (respawn?), and it's the server-load, 
	//	then keep the data from last time...
	//
	if (name[0] && !strcmp( cm.name, name ) && !clientload )
	{
		// clear some stuff that needs zeroing...
		//
		cm.floodvalid = 0;
		//NO... don't reset this because the brush checkcounts are cached, 
		//so when you load up, brush checkcounts equal the cm.checkcount 
		//and the trace will be skipped (because everything loads and
		//traces in the same exact order ever time you load the map)
		cm.checkcount++;// = 0;
		memset(cm.areas,		0, cm.numAreas * sizeof( *cm.areas ));
		memset(cm.areaPortals,	0, cm.numAreas * cm.numAreas * sizeof( *cm.areaPortals ));		
	}
	else
	{
		// ... else load map from scratch...
		//
		assert(!clientload);	// logic check. I'm assuming that a client load doesn't get this far?

		// free old stuff
		memset( &cm, 0, sizeof( cm ) );
		CM_ClearLevelPatches();
		Z_TagFree(TAG_BSP);

		if ( !name[0] ) {
			cm.numLeafs = 1;
			cm.numClusters = 1;
			cm.numAreas = 1;
			cm.cmodels = (struct cmodel_s *) Z_Malloc( sizeof( *cm.cmodels ), TAG_BSP, qtrue );
			*checksum = 0;
			return;
		}		

		// load the file into a buffer that we either discard as usual at the bottom, or if we've got enough memory
		//	then keep it long enough to save the renderer re-loading it, then discard it after that.
		//
		fileHandle_t h;
		const int iBSPLen = FS_FOpenFileRead( name, &h, qfalse );
		if(!h)
		{
			Com_Error (ERR_DROP, "Couldn't load %s", name);
			return;
		}
		gsCachedMapDiskImage[0]	= '\0';		// flag that map isn't valid, until name is filled in
		gpvCachedMapDiskImage	= Z_Malloc( iBSPLen, TAG_BSP_DISKIMAGE, qfalse);
		FS_Read(gpvCachedMapDiskImage, iBSPLen, h);
		FS_FCloseFile( h );
		
		buf = (int*) gpvCachedMapDiskImage;	// so the rest of the code works as normal

		// carry on as before...

		last_checksum = LittleLong (Com_BlockChecksum (buf, iBSPLen));		

		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 )
		{
			Z_Free(	gpvCachedMapDiskImage);
					gpvCachedMapDiskImage = NULL;

			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
		//actually we do because the new hunk sys won't allow it
		// actually we DON'T now <g>, if we've got enough ram to keep it for the renderer's disk-load...
		//
		extern qboolean Sys_LowPhysicalMemory();
		if (Sys_LowPhysicalMemory() //|| com_dedicated->integer	// no need to check for dedicated in single-player codebase
			)
		{
			Z_Free(	gpvCachedMapDiskImage );
					gpvCachedMapDiskImage = NULL;
		}
		else
		{
			// ... do nothing, and let the renderer free it after it's finished playing with it...
			//
		}

		CM_InitBoxHull ();
	}

	*checksum = last_checksum;	

	// do this whether or not the map was cached from last load...
	//
	CM_FloodAreaConnections ();

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

// need a wrapper function around this because of multiple returns, need to ensure bool is correct...
//
void CM_LoadMap( const char *name, qboolean clientload, int *checksum )
{
	gbUsingCachedMapDataRightNow = qtrue;	// !!!!!!!!!!!!!!!!!!

		CM_LoadMap_Actual( name, clientload, checksum );

	gbUsingCachedMapDataRightNow = qfalse;	// !!!!!!!!!!!!!!!!!!
}

/*
==================
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 (may need to re-BSP map?)");
	}
	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_HeadnodeForBox

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

int CM_ModelContents( clipHandle_t model ) 
{
	cmodel_t	*cmod;
	int			contents = 0;
	int			i;

	cmod = CM_ClipHandleToModel( model );

	//MCG ADDED - return the contents, too
	if( cmod->leaf.numLeafBrushes )		// check for brush
	{
		int brushNum;
		for ( i = cmod->leaf.firstLeafBrush; i < cmod->leaf.firstLeafBrush+cmod->leaf.numLeafBrushes; i++ )
		{
			brushNum = cm.leafbrushes[i];
			contents |= cm.brushes[brushNum].contents;
		}
	}
	if( cmod->leaf.numLeafSurfaces )	// if not brush, check for patch
	{	
		int surfaceNum;
		for ( i = cmod->leaf.firstLeafSurface; i < cmod->leaf.firstLeafSurface+cmod->leaf.numLeafSurfaces; i++ )
		{
			surfaceNum = cm.leafsurfaces[i];
			if ( cm.surfaces[surfaceNum] != NULL )
			{//HERNH?  How could we have a null surf within our cmod->leaf.numLeafSurfaces?
				contents |= cm.surfaces[surfaceNum]->contents;
			}
		}
	}
	return contents;
}

//support for save/load games
/*
===================
CM_WritePortalState

Writes the portal state to a savegame file
===================
*/
// having to proto this stuff again here is crap, but wtf?...
//
qboolean SG_Append(unsigned long chid, void *data, int length);
int SG_Read(unsigned long chid, void *pvAddress, int iLength, void **ppvAddressPtr = NULL);

void CM_WritePortalState ()
{	
	SG_Append('PRTS', (void *)cm.areaPortals, cm.numAreas * cm.numAreas * sizeof( *cm.areaPortals ));
}

/*
===================
CM_ReadPortalState

Reads the portal state from a savegame file
and recalculates the area connections
===================
*/
void	CM_ReadPortalState ()
{
	SG_Read('PRTS', (void *)cm.areaPortals, cm.numAreas * cm.numAreas * sizeof( *cm.areaPortals ));
	CM_FloodAreaConnections ();
}