Xash3DArchive/engine/cmodel.c

/*
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.

*/
// cmodel.c -- model loading

#include "engine.h"
#include "server.h"
#include "collision.h"

typedef struct
{
	cplane_t	*plane;
	int			children[2];		// negative numbers are leafs
} cnode_t;

typedef struct
{
	cplane_t	*plane;
	mapsurface_t	*surface;
} cbrushside_t;

typedef struct
{
	int		contents;
	int		cluster;
	int		area;
	word		firstleafbrush;
	word		numleafbrushes;
} cleaf_t;

typedef struct
{
	int		contents;
	int		numsides;
	int		firstbrushside;
	int		checkcount;		// to avoid repeated testings
} cbrush_t;

typedef struct
{
	int		numareaportals;
	int		firstareaportal;
	int		floodnum;			// if two areas have equal floodnums, they are connected
	int		floodvalid;
} carea_t;

int			checkcount;

char		map_name[MAX_QPATH];

int			numbrushsides;
cbrushside_t map_brushsides[MAX_MAP_BRUSHSIDES];

int			numtexinfo;
mapsurface_t	map_surfaces[MAX_MAP_TEXINFO];

int	numplanes;
cplane_t	map_planes[MAX_MAP_PLANES+6];		// extra for box hull

int	numnodes;
cnode_t	map_nodes[MAX_MAP_NODES+6];		// extra for box hull

int	numleafs = 1;	// allow leaf funcs to be called without a map
cleaf_t	map_leafs[MAX_MAP_LEAFS];
int	emptyleaf, solidleaf;

int	numleafbrushes;
word	map_leafbrushes[MAX_MAP_LEAFBRUSHES];

int	numcmodels;
int	numsmodels; //numcmodels+numsmodels
cmodel_t	map_cmodels[MAX_MAP_MODELS];

int	numbrushes;
cbrush_t	map_brushes[MAX_MAP_BRUSHES];

int		numvisibility;
byte		map_visibility[MAX_MAP_VISIBILITY];
dvis_t		*map_vis = (dvis_t *)map_visibility;

int		numentitychars;
char		map_entitystring[MAX_MAP_ENTSTRING];

int		numareas = 1;
carea_t		map_areas[MAX_MAP_AREAS];

int		numareaportals;
dareaportal_t	map_areaportals[MAX_MAP_AREAPORTALS];

int		numclusters = 1;

mapsurface_t	nullsurface;

int		floodvalid;

byte	portalopen[MAX_MAP_AREAPORTALS];

cvar_t		*map_noareas;



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

					MAP LOADING

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

byte	*cmod_base;

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

	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in)) Host_Error("MOD_LoadBmodel: funny lump size\n");
	count = l->filelen / sizeof(*in);

	if (count < 1) Host_Error("Map with no models\n");
	if (count > MAX_MAP_MODELS) Host_Error("Map has too many models\n");

	numcmodels = count;

	for ( i=0 ; i<count ; i++, in++, out++)
	{
		out = &map_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;
			out->origin[j] = LittleFloat (in->origin[j]);
		}
		out->headnode = LittleLong (in->headnode);
	}
}


/*
=================
CMod_LoadSurfaces
=================
*/
void CMod_LoadSurfaces (lump_t *l)
{
	texinfo_t		*in;
	mapsurface_t	*out;
	int		i, count;

	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in)) Host_Error("MOD_LoadBmodel: funny lump size\n");
	count = l->filelen / sizeof(*in);

	if (count < 1) Host_Error("Map with no surfaces\n");
	if (count > MAX_MAP_TEXINFO) Host_Error("Map has too many surfaces\n");

	numtexinfo = count;
	out = map_surfaces;

	for ( i=0 ; i<count ; i++, in++, out++)
	{
		strncpy (out->c.name, in->texture, sizeof(out->c.name)-1);
		strncpy (out->rname, in->texture, sizeof(out->rname)-1);
		out->c.flags = LittleLong (in->flags);
		out->c.value = LittleLong (in->value);
	}
}


/*
=================
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)) Host_Error("MOD_LoadBmodel: funny lump size\n");
	count = l->filelen / sizeof(*in);

	if (count < 1) Host_Error("Map has no nodes\n");
	if (count > MAX_MAP_NODES) Host_Error("Map has too many nodes\n");

	out = map_nodes;

	numnodes = count;

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

}

/*
=================
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)) Host_Error("MOD_LoadBmodel: funny lump size\n");
	count = l->filelen / sizeof(*in);

	if (count > MAX_MAP_BRUSHES) Host_Error("Map has too many brushes\n");

	out = map_brushes;
	numbrushes = count;

	for (i = 0; i < count; i++, out++, in++)
	{
		out->firstbrushside = LittleLong(in->firstside);
		out->numsides = LittleLong(in->numsides);
		out->contents = LittleLong(in->contents);
	}

}

/*
=================
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)) Host_Error("MOD_LoadBmodel: funny lump size\n");
	count = l->filelen / sizeof(*in);

	if (count < 1) Host_Error("Map with no leafs\n");
	// need to save space for box planes
	if (count > MAX_MAP_PLANES) Host_Error("Map has too many planes\n");

	out = map_leafs;	
	numleafs = count;
	numclusters = 0;

	for ( i = 0; i < count; i++, in++, out++)
	{
		out->contents = LittleLong (in->contents);
		out->cluster = LittleShort (in->cluster);
		out->area = LittleShort (in->area);
		out->firstleafbrush = LittleShort (in->firstleafbrush);
		out->numleafbrushes = LittleShort (in->numleafbrushes);

		if (out->cluster >= numclusters)
			numclusters = out->cluster + 1;
	}

	if (map_leafs[0].contents != CONTENTS_SOLID)
		Host_Error("Map leaf 0 is not CONTENTS_SOLID\n");

	solidleaf = 0;
	emptyleaf = -1;

	for (i = 1; i < numleafs; i++)
	{
		if (!map_leafs[i].contents)
		{
			emptyleaf = i;
			break;
		}
	}

	if (emptyleaf == -1) Host_Error("Map does not have an empty leaf\n");
}

/*
=================
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)) Host_Error("MOD_LoadBmodel: funny lump size\n");
	count = l->filelen / sizeof(*in);

	if (count < 1) Host_Error("Map with no planes\n");
	// need to save space for box planes
	if (count > MAX_MAP_PLANES) Host_Error("Map has too many planes\n");

	out = map_planes;	
	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;
	}
}

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

	if (count < 1) Host_Error("Map with no planes\n");
	// need to save space for box planes
	if (count > MAX_MAP_LEAFBRUSHES) Host_Error("Map has too many leafbrushes\n");

	out = map_leafbrushes;
	numleafbrushes = count;

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

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

	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in)) Host_Error("MOD_LoadBmodel: funny lump size\n");
	count = l->filelen / sizeof(*in);

	// need to save space for box planes
	if (count > MAX_MAP_BRUSHSIDES) Host_Error("Map has too many planes\n");

	out = map_brushsides;	
	numbrushsides = count;

	for ( i = 0; i < count; i++, in++, out++)
	{
		num = LittleShort (in->planenum);
		out->plane = &map_planes[num];
		j = LittleShort (in->texinfo);
		if (j >= numtexinfo) Host_Error("Bad brushside texinfo\n");
		out->surface = &map_surfaces[j];
	}
}

/*
=================
CMod_LoadAreas
=================
*/
void CMod_LoadAreas (lump_t *l)
{
	int		i;
	carea_t		*out;
	darea_t 		*in;
	int		count;

	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in))
		Host_Error("MOD_LoadBmodel: funny lump size\n");
	count = l->filelen / sizeof(*in);

	if (count > MAX_MAP_AREAS) Host_Error("Map has too many areas\n");

	out = map_areas;
	numareas = count;

	for ( i = 0; i < count; i++, in++, out++)
	{
		out->numareaportals = LittleLong (in->numareaportals);
		out->firstareaportal = LittleLong (in->firstareaportal);
		out->floodvalid = 0;
		out->floodnum = 0;
	}
}

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

	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in))
		Host_Error("MOD_LoadBmodel: funny lump size\n");
	count = l->filelen / sizeof(*in);

	if (count > MAX_MAP_AREAS) Host_Error("Map has too many areas\n");

	out = map_areaportals;
	numareaportals = count;

	for ( i = 0; i < count; i++, in++, out++)
	{
		out->portalnum = LittleLong (in->portalnum);
		out->otherarea = LittleLong (in->otherarea);
	}
}

/*
=================
CMod_LoadVisibility
=================
*/
void CMod_LoadVisibility (lump_t *l)
{
	int		i;

	numvisibility = l->filelen;
	if (l->filelen > MAX_MAP_VISIBILITY) Host_Error("Map has too large visibility lump\n");

	Mem_Copy(map_visibility, cmod_base + l->fileofs, l->filelen);

	map_vis->numclusters = LittleLong (map_vis->numclusters);
	for (i = 0; i < map_vis->numclusters; i++)
	{
		map_vis->bitofs[i][0] = LittleLong (map_vis->bitofs[i][0]);
		map_vis->bitofs[i][1] = LittleLong (map_vis->bitofs[i][1]);
	}
}


/*
=================
CMod_LoadEntityString
=================
*/
void CMod_LoadEntityString (lump_t *l)
{
	numentitychars = l->filelen;
	if (l->filelen > MAX_MAP_ENTSTRING)
		Host_Error("Map has too large entity lump\n");

	Mem_Copy(map_entitystring, cmod_base + l->fileofs, l->filelen);
}



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

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

	map_noareas = Cvar_Get ("map_noareas", "0", 0);

	if(!strcmp(map_name, name) && (clientload || !Cvar_VariableValue ("flushmap")) )
	{
		*checksum = last_checksum;
		if (!clientload)
		{
			memset (portalopen, 0, sizeof(portalopen));
			CM_FloodAreaConnections ();
		}
		return &map_cmodels[0]; // still have the right version
	}

	// free old stuff
	numplanes = 0;
	numnodes = 0;
	numleafs = 0;
	numcmodels = 0;
	numsmodels = 0;
	numvisibility = 0;
	numentitychars = 0;
	map_entitystring[0] = 0;
	map_name[0] = 0;
	pe->FreeBSP();

	if (!name || !name[0])
	{
		numleafs = 1;
		numclusters = 1;
		numareas = 1;
		*checksum = 0;
		return &map_cmodels[0]; // cinematic servers won't have anything at all
	}

	// load the file
	buf = (uint *)FS_LoadFile (name, &length);
	if (!buf) Host_Error("Couldn't load %s\n", 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 != BSPMOD_VERSION)
		Host_Error("CMod_LoadBrushModel: %s has wrong version number (%i should be %i)\n", name, header.version, BSPMOD_VERSION);

	cmod_base = (byte *)buf;

	// load into heap
	CMod_LoadSurfaces (&header.lumps[LUMP_TEXINFO]);
	CMod_LoadLeafs (&header.lumps[LUMP_LEAFS]);
	CMod_LoadLeafBrushes (&header.lumps[LUMP_LEAFBRUSHES]);
	CMod_LoadPlanes (&header.lumps[LUMP_PLANES]);
	CMod_LoadBrushes (&header.lumps[LUMP_BRUSHES]);
	CMod_LoadBrushSides (&header.lumps[LUMP_BRUSHSIDES]);
	CMod_LoadSubmodels (&header.lumps[LUMP_MODELS]);
	CMod_LoadNodes (&header.lumps[LUMP_NODES]);
	CMod_LoadAreas (&header.lumps[LUMP_AREAS]);
	CMod_LoadAreaPortals (&header.lumps[LUMP_AREAPORTALS]);
	CMod_LoadVisibility (&header.lumps[LUMP_VISIBILITY]);
	CMod_LoadEntityString (&header.lumps[LUMP_ENTITIES]);

	pe->LoadBSP( buf ); // create physics collision
	Mem_Free( buf ); // release map buffer

	CM_InitBoxHull ();

	memset(portalopen, 0, sizeof(portalopen));
	CM_FloodAreaConnections ();
	strcpy (map_name, name);

	return &map_cmodels[0];
}

/*
==================
CM_InlineModel
==================
*/
cmodel_t	*CM_InlineModel (char *name)
{
	int num = atoi (name + 1);

	if (num < 1 || num >= numcmodels)
	{
		Msg("CM_InlineModel: bad number %d\n", num );
		return NULL;
	}

	return &map_cmodels[num];
}

int CM_NumClusters (void)
{
	return numclusters;
}

int CM_NumInlineModels (void)
{
	return numcmodels;
}

char *CM_EntityString (void)
{
	return map_entitystring;
}

int CM_LeafContents (int leafnum)
{
	if (leafnum < 0 || leafnum >= numleafs)
		Host_Error("CM_LeafContents: bad number %d\n", leafnum );
	return map_leafs[leafnum].contents;
}

int CM_LeafCluster (int leafnum)
{
	if (leafnum < 0 || leafnum >= numleafs)
		Host_Error("CM_LeafCluster: bad number %d\n", leafnum );
	return map_leafs[leafnum].cluster;
}

int CM_LeafArea (int leafnum)
{
	if (leafnum < 0 || leafnum >= numleafs)
		Host_Error("CM_LeafArea: bad number %d\n", leafnum );
	return map_leafs[leafnum].area;
}

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


cplane_t	*box_planes;
int	box_headnode;
cbrush_t	*box_brush;
cleaf_t	*box_leaf;

/*
===================
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;
	cnode_t		*c;
	cplane_t	*p;
	cbrushside_t	*s;

	box_headnode = numnodes;
	box_planes = &map_planes[numplanes];
	if (numnodes + 6 > MAX_MAP_NODES || numbrushes + 1 > MAX_MAP_BRUSHES || numleafbrushes + 1 > MAX_MAP_LEAFBRUSHES
		|| numbrushsides + 6 > MAX_MAP_BRUSHSIDES || numplanes + 12 > MAX_MAP_PLANES)
		Host_Error("Not enough room for box tree\n");

	box_brush = &map_brushes[numbrushes];
	box_brush->numsides = 6;
	box_brush->firstbrushside = numbrushsides;
	box_brush->contents = CONTENTS_MONSTER;

	box_leaf = &map_leafs[numleafs];
	box_leaf->contents = CONTENTS_MONSTER;
	box_leaf->firstleafbrush = numleafbrushes;
	box_leaf->numleafbrushes = 1;

	map_leafbrushes[numleafbrushes] = numbrushes;

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

		// brush sides
		s = &map_brushsides[numbrushsides+i];
		s->plane = map_planes + (numplanes+i*2+side);
		s->surface = &nullsurface;

		// nodes
		c = &map_nodes[box_headnode+i];
		c->plane = map_planes + (numplanes+i*2);
		c->children[side] = -1 - emptyleaf;
		if (i != 5) c->children[side^1] = box_headnode+i + 1;
		else c->children[side^1] = -1 - numleafs;

		// 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;
	}	
}


/*
===================
CM_HeadnodeForBox

To keep everything totally uniform, bounding boxes are turned into small
BSP trees instead of being compared directly.
===================
*/
int	CM_HeadnodeForBox (vec3_t mins, 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];

	return box_headnode;
}


/*
==================
CM_PointLeafnum_r

==================
*/
int CM_PointLeafnum_r (vec3_t p, int num)
{
	float		d;
	cnode_t		*node;
	cplane_t	*plane;

	while (num >= 0)
	{
		node = map_nodes + num;
		plane = node->plane;
		
		if (plane->type < 3)
			d = p[plane->type] - plane->dist;
		else
			d = DotProduct (plane->normal, p) - plane->dist;
		if (d < 0)
			num = node->children[1];
		else
			num = node->children[0];
	}
	return -1 - num;
}

int CM_PointLeafnum (vec3_t p)
{
	if (!numplanes)
		return 0;		// sound may call this without map loaded
	return CM_PointLeafnum_r (p, 0);
}



/*
=============
CM_BoxLeafnums

Fills in a list of all the leafs touched
=============
*/
int		leaf_count, leaf_maxcount;
int		*leaf_list;
float	*leaf_mins, *leaf_maxs;
int		leaf_topnode;

void CM_BoxLeafnums_r( int nodenum )
{
	cplane_t	*plane;
	cnode_t		*node;
	int		s;

	while (1)
	{
		if (nodenum < 0)
		{
			if (leaf_count >= leaf_maxcount)
			{
//				Msg ("CM_BoxLeafnums_r: overflow\n");
				return;
			}
			leaf_list[leaf_count++] = -1 - nodenum;
			return;
		}
	
		node = &map_nodes[nodenum];
		plane = node->plane;
		s = BoxOnPlaneSide(leaf_mins, leaf_maxs, plane);
		if (s == SIDE_BACK) 
			nodenum = node->children[0];
		else if (s == SIDE_ON)
			nodenum = node->children[1];
		else
		{	// go down both
			if (leaf_topnode == -1)
				leaf_topnode = nodenum;
			CM_BoxLeafnums_r (node->children[0]);
			nodenum = node->children[1];
		}

	}
}

int CM_BoxLeafnums_headnode (vec3_t mins, vec3_t maxs, int *list, int listsize, int headnode, int *topnode)
{
	leaf_list = list;
	leaf_count = 0;
	leaf_maxcount = listsize;
	leaf_mins = mins;
	leaf_maxs = maxs;

	leaf_topnode = -1;

	CM_BoxLeafnums_r (headnode);

	if (topnode)
		*topnode = leaf_topnode;

	return leaf_count;
}

int CM_BoxLeafnums(vec3_t mins, vec3_t maxs, int *list, int listsize, int *topnode)
{
	return CM_BoxLeafnums_headnode (mins, maxs, list, listsize, map_cmodels[0].headnode, topnode);
}



/*
==================
CM_PointContents

==================
*/
int CM_PointContents (vec3_t p, int headnode)
{
	int		l;

	if (!numnodes)	// map not loaded
		return 0;

	l = CM_PointLeafnum_r (p, headnode);

	return map_leafs[l].contents;
}

/*
==================
CM_TransformedPointContents

Handles offseting and rotation of the end points for moving and
rotating entities
==================
*/
int	CM_TransformedPointContents (vec3_t p, int headnode, vec3_t origin, vec3_t angles)
{
	vec3_t		p_l;
	vec3_t		temp;
	vec3_t		forward, right, up;
	int			l;

	// subtract origin offset
	VectorSubtract (p, origin, p_l);

	// rotate start and end into the models frame of reference
	if (headnode != box_headnode && 
	(angles[0] || angles[1] || angles[2]) )
	{
		AngleVectors (angles, forward, right, up);

		VectorCopy (p_l, temp);
		p_l[0] = DotProduct (temp, forward);
		p_l[1] = -DotProduct (temp, right);
		p_l[2] = DotProduct (temp, up);
	}

	l = CM_PointLeafnum_r (p_l, headnode);

	return map_leafs[l].contents;
}


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

BOX TRACING

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

// 1/32 epsilon to keep floating point happy
#define	DIST_EPSILON	(0.03125)

vec3_t	trace_start, trace_end;
vec3_t	trace_mins, trace_maxs;
vec3_t	trace_extents;

trace_t	trace_trace;
int		trace_contents;
bool	trace_ispoint;		// optimized case

/*
================
CM_ClipBoxToBrush
================
*/
void CM_ClipBoxToBrush (vec3_t mins, vec3_t maxs, vec3_t p1, vec3_t p2,
					  trace_t *trace, cbrush_t *brush)
{
	int			i, j;
	cplane_t	*plane, *clipplane;
	float		dist;
	float		enterfrac, leavefrac;
	vec3_t		ofs;
	float		d1, d2;
	bool	getout, startout;
	float		f;
	cbrushside_t	*side, *leadside;

	enterfrac = -1;
	leavefrac = 1;
	clipplane = NULL;

	if (!brush->numsides)
		return;

	getout = false;
	startout = false;
	leadside = NULL;

	for (i=0 ; i<brush->numsides ; i++)
	{
		side = &map_brushsides[brush->firstbrushside+i];
		plane = side->plane;

		// FIXME: special case for axial

		if (!trace_ispoint)
		{	// general box case

			// push the plane out apropriately for mins/maxs

			// FIXME: use signbits into 8 way lookup for each mins/maxs
			for (j=0 ; j<3 ; j++)
			{
				if (plane->normal[j] < 0)
					ofs[j] = maxs[j];
				else
					ofs[j] = mins[j];
			}
			dist = DotProduct (ofs, plane->normal);
			dist = plane->dist - dist;
		}
		else
		{	// special point case
			dist = plane->dist;
		}

		d1 = DotProduct (p1, plane->normal) - dist;
		d2 = DotProduct (p2, plane->normal) - dist;

		if (d2 > 0)
			getout = true;	// endpoint is not in solid
		if (d1 > 0)
			startout = true;

		// if completely in front of face, no intersection
		if (d1 > 0 && d2 >= d1)
			return;

		if (d1 <= 0 && d2 <= 0)
			continue;

		// crosses face
		if (d1 > d2)
		{	// enter
			f = (d1-DIST_EPSILON) / (d1-d2);
			if (f > enterfrac)
			{
				enterfrac = f;
				clipplane = plane;
				leadside = side;
			}
		}
		else
		{	// leave
			f = (d1+DIST_EPSILON) / (d1-d2);
			if (f < leavefrac)
				leavefrac = f;
		}
	}

	if (!startout)
	{	// original point was inside brush
		trace->startsolid = true;
		if (!getout)
			trace->allsolid = true;
		return;
	}
	if (enterfrac < leavefrac)
	{
		if (enterfrac > -1 && enterfrac < trace->fraction)
		{
			if (enterfrac < 0)
				enterfrac = 0;
			trace->fraction = enterfrac;
			trace->plane = *clipplane;
			trace->surface = &(leadside->surface->c);
			trace->contents = brush->contents;
		}
	}
}

/*
================
CM_TestBoxInBrush
================
*/
void CM_TestBoxInBrush (vec3_t mins, vec3_t maxs, vec3_t p1,
					  trace_t *trace, cbrush_t *brush)
{
	int			i, j;
	cplane_t	*plane;
	float		dist;
	vec3_t		ofs;
	float		d1;
	cbrushside_t	*side;

	if (!brush->numsides)
		return;

	for (i=0 ; i<brush->numsides ; i++)
	{
		side = &map_brushsides[brush->firstbrushside+i];
		plane = side->plane;

		// FIXME: special case for axial

		// general box case

		// push the plane out apropriately for mins/maxs

		// FIXME: use signbits into 8 way lookup for each mins/maxs
		for (j=0 ; j<3 ; j++)
		{
			if (plane->normal[j] < 0)
				ofs[j] = maxs[j];
			else
				ofs[j] = mins[j];
		}
		dist = DotProduct (ofs, plane->normal);
		dist = plane->dist - dist;

		d1 = DotProduct (p1, plane->normal) - dist;

		// if completely in front of face, no intersection
		if (d1 > 0)
			return;

	}

	// inside this brush
	trace->startsolid = trace->allsolid = true;
	trace->fraction = 0;
	trace->contents = brush->contents;
}


/*
================
CM_TraceToLeaf
================
*/
void CM_TraceToLeaf (int leafnum)
{
	int			k;
	int			brushnum;
	cleaf_t		*leaf;
	cbrush_t	*b;

	leaf = &map_leafs[leafnum];
	if ( !(leaf->contents & trace_contents))
		return;
	// trace line against all brushes in the leaf
	for (k=0 ; k<leaf->numleafbrushes ; k++)
	{
		brushnum = map_leafbrushes[leaf->firstleafbrush+k];
		b = &map_brushes[brushnum];
		if (b->checkcount == checkcount)
			continue;	// already checked this brush in another leaf
		b->checkcount = checkcount;

		if ( !(b->contents & trace_contents))
			continue;
		CM_ClipBoxToBrush (trace_mins, trace_maxs, trace_start, trace_end, &trace_trace, b);
		if (!trace_trace.fraction)
			return;
	}

}


/*
================
CM_TestInLeaf
================
*/
void CM_TestInLeaf (int leafnum)
{
	int			k;
	int			brushnum;
	cleaf_t		*leaf;
	cbrush_t	*b;

	leaf = &map_leafs[leafnum];
	if ( !(leaf->contents & trace_contents))
		return;
	// trace line against all brushes in the leaf
	for (k=0 ; k<leaf->numleafbrushes ; k++)
	{
		brushnum = map_leafbrushes[leaf->firstleafbrush+k];
		b = &map_brushes[brushnum];
		if (b->checkcount == checkcount)
			continue;	// already checked this brush in another leaf
		b->checkcount = checkcount;

		if ( !(b->contents & trace_contents))
			continue;
		CM_TestBoxInBrush (trace_mins, trace_maxs, trace_start, &trace_trace, b);
		if (!trace_trace.fraction)
			return;
	}

}


/*
==================
CM_RecursiveHullCheck

==================
*/
void CM_RecursiveHullCheck (int num, float p1f, float p2f, vec3_t p1, vec3_t p2)
{
	cnode_t		*node;
	cplane_t	*plane;
	float		t1, t2, offset;
	float		frac, frac2;
	float		idist;
	int			i;
	vec3_t		mid;
	int			side;
	float		midf;

	if (trace_trace.fraction <= p1f)
		return;		// already hit something nearer

	// if < 0, we are in a leaf node
	if (num < 0)
	{
		CM_TraceToLeaf (-1-num);
		return;
	}

	//
	// find the point distances to the seperating plane
	// and the offset for the size of the box
	//
	node = map_nodes + num;
	plane = node->plane;

	if (plane->type < 3)
	{
		t1 = p1[plane->type] - plane->dist;
		t2 = p2[plane->type] - plane->dist;
		offset = trace_extents[plane->type];
	}
	else
	{
		t1 = DotProduct (plane->normal, p1) - plane->dist;
		t2 = DotProduct (plane->normal, p2) - plane->dist;
		if (trace_ispoint)
			offset = 0;
		else
			offset = fabs(trace_extents[0]*plane->normal[0]) +
				fabs(trace_extents[1]*plane->normal[1]) +
				fabs(trace_extents[2]*plane->normal[2]);
	}


#if 0
CM_RecursiveHullCheck (node->children[0], p1f, p2f, p1, p2);
CM_RecursiveHullCheck (node->children[1], p1f, p2f, p1, p2);
return;
#endif

	// see which sides we need to consider
	if (t1 >= offset && t2 >= offset)
	{
		CM_RecursiveHullCheck (node->children[0], p1f, p2f, p1, p2);
		return;
	}
	if (t1 < -offset && t2 < -offset)
	{
		CM_RecursiveHullCheck (node->children[1], p1f, p2f, p1, p2);
		return;
	}

	// put the crosspoint DIST_EPSILON pixels on the near side
	if (t1 < t2)
	{
		idist = 1.0/(t1-t2);
		side = 1;
		frac2 = (t1 + offset + DIST_EPSILON)*idist;
		frac = (t1 - offset + DIST_EPSILON)*idist;
	}
	else if (t1 > t2)
	{
		idist = 1.0/(t1-t2);
		side = 0;
		frac2 = (t1 - offset - DIST_EPSILON)*idist;
		frac = (t1 + offset + DIST_EPSILON)*idist;
	}
	else
	{
		side = 0;
		frac = 1;
		frac2 = 0;
	}

	// move up to the node
	if (frac < 0)
		frac = 0;
	if (frac > 1)
		frac = 1;
		
	midf = p1f + (p2f - p1f)*frac;
	for (i=0 ; i<3 ; i++)
		mid[i] = p1[i] + frac*(p2[i] - p1[i]);

	CM_RecursiveHullCheck (node->children[side], p1f, midf, p1, mid);


	// go past the node
	if (frac2 < 0)
		frac2 = 0;
	if (frac2 > 1)
		frac2 = 1;
		
	midf = p1f + (p2f - p1f)*frac2;
	for (i=0 ; i<3 ; i++)
		mid[i] = p1[i] + frac2*(p2[i] - p1[i]);

	CM_RecursiveHullCheck (node->children[side^1], midf, p2f, mid, p2);
}



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

/*
==================
CM_BoxTrace
==================
*/
trace_t		CM_BoxTrace (vec3_t start, vec3_t end,
						  vec3_t mins, vec3_t maxs,
						  int headnode, int brushmask)
{
	int		i;

	checkcount++;		// for multi-check avoidance

	// fill in a default trace
	memset (&trace_trace, 0, sizeof(trace_trace));
	trace_trace.fraction = 1;
	trace_trace.surface = &(nullsurface.c);

	if (!numnodes)	// map not loaded
		return trace_trace;

	trace_contents = brushmask;
	VectorCopy (start, trace_start);
	VectorCopy (end, trace_end);
	VectorCopy (mins, trace_mins);
	VectorCopy (maxs, trace_maxs);

	//
	// check for position test special case
	//
	if (start[0] == end[0] && start[1] == end[1] && start[2] == end[2])
	{
		int		leafs[1024];
		int		i, numleafs;
		vec3_t	c1, c2;
		int		topnode;

		VectorAdd (start, mins, c1);
		VectorAdd (start, maxs, c2);
		for (i=0 ; i<3 ; i++)
		{
			c1[i] -= 1;
			c2[i] += 1;
		}

		numleafs = CM_BoxLeafnums_headnode (c1, c2, leafs, 1024, headnode, &topnode);
		for (i=0 ; i<numleafs ; i++)
		{
			CM_TestInLeaf (leafs[i]);
			if (trace_trace.allsolid)
				break;
		}
		VectorCopy (start, trace_trace.endpos);
		return trace_trace;
	}

	//
	// check for point special case
	//
	if (mins[0] == 0 && mins[1] == 0 && mins[2] == 0
		&& maxs[0] == 0 && maxs[1] == 0 && maxs[2] == 0)
	{
		trace_ispoint = true;
		VectorClear (trace_extents);
	}
	else
	{
		trace_ispoint = false;
		trace_extents[0] = -mins[0] > maxs[0] ? -mins[0] : maxs[0];
		trace_extents[1] = -mins[1] > maxs[1] ? -mins[1] : maxs[1];
		trace_extents[2] = -mins[2] > maxs[2] ? -mins[2] : maxs[2];
	}

	//
	// general sweeping through world
	//
	CM_RecursiveHullCheck (headnode, 0, 1, start, end);

	if (trace_trace.fraction == 1)
	{
		VectorCopy (end, trace_trace.endpos);
	}
	else
	{
		for (i=0 ; i<3 ; i++)
			trace_trace.endpos[i] = start[i] + trace_trace.fraction * (end[i] - start[i]);
	}
	return trace_trace;
}


/*
==================
CM_TransformedBoxTrace

Handles offseting and rotation of the end points for moving and
rotating entities
==================
*/
#ifdef _WIN32
#pragma optimize( "", off )
#endif


trace_t CM_TransformedBoxTrace (vec3_t start, vec3_t end,
						  vec3_t mins, vec3_t maxs,
						  int headnode, int brushmask,
						  vec3_t origin, vec3_t angles)
{
	trace_t		trace;
	vec3_t		start_l, end_l;
	vec3_t		a;
	vec3_t		forward, right, up;
	vec3_t		temp;
	bool	rotated;

	// subtract origin offset
	VectorSubtract (start, origin, start_l);
	VectorSubtract (end, origin, end_l);

	// rotate start and end into the models frame of reference
	if (headnode != box_headnode && 
	(angles[0] || angles[1] || angles[2]) )
		rotated = true;
	else
		rotated = false;

	if (rotated)
	{
		AngleVectors (angles, forward, right, up);

		VectorCopy (start_l, temp);
		start_l[0] = DotProduct (temp, forward);
		start_l[1] = -DotProduct (temp, right);
		start_l[2] = DotProduct (temp, up);

		VectorCopy (end_l, temp);
		end_l[0] = DotProduct (temp, forward);
		end_l[1] = -DotProduct (temp, right);
		end_l[2] = DotProduct (temp, up);
	}

	// sweep the box through the model
	trace = CM_BoxTrace (start_l, end_l, mins, maxs, headnode, brushmask);

	if (rotated && trace.fraction != 1.0)
	{
		// FIXME: figure out how to do this with existing angles
		VectorCopy( angles, a );
		VectorNegate ( a, a );
		AngleVectors (a, forward, right, up);

		VectorCopy (trace.plane.normal, temp);
		trace.plane.normal[0] = DotProduct (temp, forward);
		trace.plane.normal[1] = -DotProduct (temp, right);
		trace.plane.normal[2] = DotProduct (temp, up);
	}

	trace.endpos[0] = start[0] + trace.fraction * (end[0] - start[0]);
	trace.endpos[1] = start[1] + trace.fraction * (end[1] - start[1]);
	trace.endpos[2] = start[2] + trace.fraction * (end[2] - start[2]);

	return trace;
}

#ifdef _WIN32
#pragma optimize( "", on )
#endif



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

PVS / PHS

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

/*
===================
CM_DecompressVis
===================
*/
void CM_DecompressVis (byte *in, byte *out)
{
	int		c;
	byte	*out_p;
	int		row;

	row = (numclusters+7)>>3;	
	out_p = out;

	if (!in || !numvisibility)
	{	// no vis info, so make all visible
		while (row)
		{
			*out_p++ = 0xff;
			row--;
		}
		return;		
	}

	do
	{
		if (*in)
		{
			*out_p++ = *in++;
			continue;
		}
	
		c = in[1];
		in += 2;
		if ((out_p - out) + c > row)
		{
			c = row - (out_p - out);
			MsgWarn("CM_DecompressVis: decompression overrun\n");
		}
		while (c)
		{
			*out_p++ = 0;
			c--;
		}
	} while (out_p - out < row);
}

byte pvsrow[MAX_MAP_LEAFS/8];
byte phsrow[MAX_MAP_LEAFS/8];

byte *CM_ClusterPVS (int cluster)
{
	if (cluster == -1)
		memset (pvsrow, 0, (numclusters+7)>>3);
	else
		CM_DecompressVis (map_visibility + map_vis->bitofs[cluster][DVIS_PVS], pvsrow);
	return pvsrow;
}

byte *CM_ClusterPHS (int cluster)
{
	if (cluster == -1)
		memset (phsrow, 0, (numclusters+7)>>3);
	else
		CM_DecompressVis (map_visibility + map_vis->bitofs[cluster][DVIS_PHS], phsrow);
	return phsrow;
}


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

AREAPORTALS

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

void FloodArea_r (carea_t *area, int floodnum)
{
	int		i;
	dareaportal_t	*p;

	if (area->floodvalid == floodvalid)
	{
		if (area->floodnum == floodnum) return;
		Host_Error("FloodArea_r: reflooded\n");
	}

	area->floodnum = floodnum;
	area->floodvalid = floodvalid;
	p = &map_areaportals[area->firstareaportal];

	for (i = 0; i < area->numareaportals; i++, p++)
	{
		if (portalopen[p->portalnum])
			FloodArea_r (&map_areas[p->otherarea], floodnum);
	}
}

/*
====================
CM_FloodAreaConnections
====================
*/
void CM_FloodAreaConnections (void)
{
	int		i;
	carea_t	*area;
	int		floodnum;

	// all current floods are now invalid
	floodvalid++;
	floodnum = 0;

	// area 0 is not used
	for (i = 1; i < numareas; i++)
	{
		area = &map_areas[i];

		// already flooded into
		if (area->floodvalid == floodvalid) continue;
		floodnum++;
		FloodArea_r (area, floodnum);
	}
}

void CM_SetAreaPortalState (int portalnum, bool open)
{
	if (portalnum > numareaportals)
		Host_Error("CM_SetAreaPortalState: areaportal > numareaportals\n");

	portalopen[portalnum] = open;
	CM_FloodAreaConnections ();
}

bool CM_AreasConnected (int area1, int area2)
{
	if (map_noareas->value)
		return true;

	if (area1 > numareas || area2 > numareas)
		Host_Error("CM_AreasConnected: area > numareas\n");

	if (map_areas[area1].floodnum == map_areas[area2].floodnum)
		return true;
	return false;
}


/*
=================
CM_WriteAreaBits

Writes a length byte followed by a bit vector of all the areas
that area in the same flood as the area parameter

This is used by the client refreshes to cull visibility
=================
*/
int CM_WriteAreaBits (byte *buffer, int area)
{
	int		i;
	int		floodnum;
	int		bytes;

	bytes = (numareas+7)>>3;

	if (map_noareas->value)
	{	// for debugging, send everything
		memset (buffer, 255, bytes);
	}
	else
	{
		memset (buffer, 0, bytes);

		floodnum = map_areas[area].floodnum;
		for (i=0 ; i<numareas ; i++)
		{
			if (map_areas[i].floodnum == floodnum || !area)
				buffer[i>>3] |= 1<<(i&7);
		}
	}

	return bytes;
}

/*
=============
CM_HeadnodeVisible

Returns true if any leaf under headnode has a cluster that
is potentially visible
=============
*/
bool CM_HeadnodeVisible (int nodenum, byte *visbits)
{
	int		leafnum;
	int		cluster;
	cnode_t	*node;

	if (nodenum < 0)
	{
		leafnum = -1-nodenum;
		cluster = map_leafs[leafnum].cluster;
		if (cluster == -1)
			return false;
		if (visbits[cluster>>3] & (1<<(cluster&7)))
			return true;
		return false;
	}

	node = &map_nodes[nodenum];
	if (CM_HeadnodeVisible(node->children[0], visbits))
		return true;
	return CM_HeadnodeVisible(node->children[1], visbits);
}

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

STUDIO SHARED CMODELS

===============================================================================
*/
#define HULL_PRECISION	4

word hull_table[] = { 0, 4, 8, 16, 18, 24, 28, 30, 32, 40, 48, 54, 56, 60, 64, 72, 80, 112, 120, 128, 140, 176 };
#define NUM_HULL_ROUNDS (sizeof(hull_table) / sizeof(word))

void CM_RoundUpHullSize(vec3_t size, bool down)
{
          int	i, j;
	
	for(i = 0; i < 3; i++)
	{
		bool negative = false;
                    float result, value;

		value = down ? floor(size[i]) : ceil(size[i]);//round it
		if(value < 0) negative = true;
		value = fabs(value);//make positive

		// lookup hull table
		for(j = 0; j < NUM_HULL_ROUNDS; j++)
          	{
			result = value - hull_table[j];
			if(result <= HULL_PRECISION)
			{ 
				result = negative ? -hull_table[j] : hull_table[j];
				break;
			}
		}
		size[i] = result;//copy new value
	}
}

cmodel_t *CM_StudioModel( char *name, edict_t *ent, byte *buffer)
{
	cmodel_t		*out;
	studiohdr_t	*phdr;

	phdr = (studiohdr_t *)buffer;

	if(phdr->version != STUDIO_VERSION)
	{
		MsgWarn("CM_StudioModel: %s has wrong version number (%i should be %i)", phdr->name, phdr->version, STUDIO_VERSION);
		return NULL;
	}

	out = &map_cmodels[numcmodels + numsmodels];
	out->extradata = buffer;
	out->numframes = 0;//reset sprite info
	com.strncpy(out->name, name, sizeof(out->name));
	if(!out->mempool) out->mempool = Mem_AllocPool( out->name );// create pool
	else Mem_EmptyPool( out->mempool );			// clear pool

	// create convex mesh physbuffer
	SV_CreateMeshBuffer( ent, out );

	numsmodels++;
	return out;
}

cmodel_t *CM_SpriteModel( char *name, edict_t *ent, byte *buffer)
{
	cmodel_t		*out;
	dsprite_t		*phdr;

	phdr = (dsprite_t *)buffer;
	
	if(phdr->version != SPRITE_VERSION_HALF && phdr->version != SPRITE_VERSION_XASH)
	{
		MsgWarn("CM_SpriteModel: %s has wrong version number (%i should be %i or %i)\n", name, phdr->version, SPRITE_VERSION_HALF, SPRITE_VERSION_XASH);
		return NULL;
	}
	
	out = &map_cmodels[numcmodels + numsmodels];
	out->numframes = phdr->numframes;
	com.strncpy(out->name, name, sizeof(out->name));
	if(out->mempool) Mem_EmptyPool( out->mempool );	// clear pool
	else out->mempool = Mem_AllocPool( out->name );	// create pool

	out->mins[0] = out->mins[1] = -phdr->width / 2;
	out->maxs[0] = out->maxs[1] = phdr->width / 2;
	out->mins[2] = -phdr->height / 2;
	out->maxs[2] = phdr->height / 2;

	numsmodels++;
	return out;
}

cmodel_t *CM_LoadModel( edict_t *ent )
{
	char		name[MAX_QPATH];
	byte		*buffer;
	cmodel_t		*mod = NULL;
	int		i, max_models = numcmodels + numsmodels;
	int		modelindex = ent->progs.sv->modelindex;

	// check for preloading
	strncpy(name, sv.configstrings[CS_MODELS + modelindex], MAX_QPATH );
	if(name[0] == '*') return CM_InlineModel( name ); // skip bmodels

	for(i = numsmodels; i < max_models; i++ )
          {
		mod = &map_cmodels[i];
		if(!com.strcmp(name, mod->name))
			return mod;
	} 

	// register new model
	if(numcmodels + numsmodels > MAX_MAP_MODELS)
	{
		MsgWarn("CM_LoadModel: MAX_MAP_MODELS limit exceeded\n" );
		return NULL;		
	}
	if(!FS_FileExists( name ))
	{
		MsgWarn("CM_LoadModel: %s not found\n", name );
		return NULL;
	}

	MsgDev(D_NOTE, "CM_LoadModel: load %s\n", name );
	buffer = FS_LoadFile( name, NULL );

	// call the apropriate loader
	switch (LittleLong(*(uint *)buffer))
	{
	case IDSTUDIOHEADER:
		mod = CM_StudioModel( name, ent, buffer );
		break;
	case IDSPRITEHEADER:
		mod = CM_SpriteModel( name, ent, buffer );
		break;
	}
	return mod;
}