ref: 38a17aa05616a0f792b054ba8ed23a9645b76721
dir: /cmodel.c/
// cmodel.c -- model loading
#include <u.h>
#include <libc.h>
#include <stdio.h>
#include "dat.h"
#include "fns.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;
unsigned short firstleafbrush;
unsigned short 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;
unsigned short map_leafbrushes[MAX_MAP_LEAFBRUSHES];
int numcmodels;
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;
qboolean portalopen[MAX_MAP_AREAPORTALS];
cvar_t *map_noareas;
void CM_InitBoxHull (void);
void FloodAreaConnections (void);
int c_pointcontents;
int c_traces, c_brush_traces;
/*
===============================================================================
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))
Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
count = l->filelen / sizeof(*in);
if (count < 1)
Com_Error (ERR_DROP, "Map with no models");
if (count > MAX_MAP_MODELS)
Com_Error (ERR_DROP, "Map has too many models");
numcmodels = count;
for ( i=0 ; i<count ; i++, in++)
{
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))
Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
count = l->filelen / sizeof(*in);
if (count < 1)
Com_Error (ERR_DROP, "Map with no surfaces");
if (count > MAX_MAP_TEXINFO)
Com_Error (ERR_DROP, "Map has too many surfaces");
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))
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");
if (count > MAX_MAP_NODES)
Com_Error (ERR_DROP, "Map has too many nodes");
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))
Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
count = l->filelen / sizeof(*in);
if (count > MAX_MAP_BRUSHES)
Com_Error (ERR_DROP, "Map has too many brushes");
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))
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");
// need to save space for box planes
if (count > MAX_MAP_PLANES)
Com_Error (ERR_DROP, "Map has too many planes");
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)
Com_Error (ERR_DROP, "Map leaf 0 is not CONTENTS_SOLID");
solidleaf = 0;
emptyleaf = -1;
for (i=1 ; i<numleafs ; i++)
{
if (!map_leafs[i].contents)
{
emptyleaf = i;
break;
}
}
if (emptyleaf == -1)
Com_Error (ERR_DROP, "Map does not have an empty leaf");
}
/*
=================
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");
// need to save space for box planes
if (count > MAX_MAP_PLANES)
Com_Error (ERR_DROP, "Map has too many planes");
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)
{
int i;
unsigned short *out;
unsigned short *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 planes");
// need to save space for box planes
if (count > MAX_MAP_LEAFBRUSHES)
Com_Error (ERR_DROP, "Map has too many leafbrushes");
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))
Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
count = l->filelen / sizeof(*in);
// need to save space for box planes
if (count > MAX_MAP_BRUSHSIDES)
Com_Error (ERR_DROP, "Map has too many planes");
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)
Com_Error (ERR_DROP, "Bad brushside texinfo");
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))
Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
count = l->filelen / sizeof(*in);
if (count > MAX_MAP_AREAS)
Com_Error (ERR_DROP, "Map has too many areas");
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)
{
int i;
dareaportal_t *out;
dareaportal_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 > MAX_MAP_AREAS)
Com_Error (ERR_DROP, "Map has too many areas");
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)
Com_Error (ERR_DROP, "Map has too large visibility lump");
memcpy (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)
Com_Error (ERR_DROP, "Map has too large entity lump");
memcpy (map_entitystring, cmod_base + l->fileofs, l->filelen);
}
/*
==================
CM_LoadMap
Loads in the map and all submodels
==================
*/
cmodel_t *CM_LoadMap (char *name, qboolean clientload, unsigned *checksum)
{
unsigned *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));
FloodAreaConnections ();
}
return &map_cmodels[0]; // still have the right version
}
// free old stuff
numplanes = 0;
numnodes = 0;
numleafs = 0;
numcmodels = 0;
numvisibility = 0;
numentitychars = 0;
map_entitystring[0] = 0;
map_name[0] = 0;
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
//
length = FS_LoadFile (name, (void **)&buf);
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)/sizeof(int) ; i++)
((int *)&header)[i] = LittleLong ( ((int *)&header)[i]);
if (header.version != BSPVERSION)
Com_Error (ERR_DROP, "CMod_LoadBrushModel: %s has wrong version number (%i should be %i)"
, name, header.version, BSPVERSION);
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]);
FS_FreeFile (buf);
CM_InitBoxHull ();
memset (portalopen, 0, sizeof(portalopen));
FloodAreaConnections ();
strcpy (map_name, name);
return &map_cmodels[0];
}
/*
==================
CM_InlineModel
==================
*/
cmodel_t *CM_InlineModel (char *name)
{
int num;
if (!name || name[0] != '*')
Com_Error (ERR_DROP, "CM_InlineModel: bad name");
num = atoi (name+1);
if (num < 1 || num >= numcmodels)
Com_Error (ERR_DROP, "CM_InlineModel: bad number");
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)
Com_Error (ERR_DROP, "CM_LeafContents: bad number");
return map_leafs[leafnum].contents;
}
int CM_LeafCluster (int leafnum)
{
if (leafnum < 0 || leafnum >= numleafs)
Com_Error (ERR_DROP, "CM_LeafCluster: bad number");
return map_leafs[leafnum].cluster;
}
int CM_LeafArea (int leafnum)
{
if (leafnum < 0 || leafnum >= numleafs)
Com_Error (ERR_DROP, "CM_LeafArea: bad number");
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)
Com_Error (ERR_DROP, "Not enough room for box tree");
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
Creates a clipping hull for an arbitrary box
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];
}
c_pointcontents++; // optimize counter
return -1 - num;
}
/* call with topnode set to the headnode, returns with topnode set to the first
* node that splits the box */
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)
{
// Com_Printf ("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);
s = BOX_ON_PLANE_SIDE(leaf_mins, leaf_maxs, plane);
if (s == 1)
nodenum = node->children[0];
else if (s == 2)
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;
qboolean 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;
qboolean getout, startout;
float f;
cbrushside_t *side, *leadside;
enterfrac = -1;
leavefrac = 1;
clipplane = NULL;
if (!brush->numsides)
return;
c_brush_traces++;
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]);
}
/*
CM_RecursiveHullCheck (node->children[0], p1f, p2f, p1, p2);
CM_RecursiveHullCheck (node->children[1], p1f, p2f, p1, p2);
return;
*/
// 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
c_traces++; // for statistics, may be zeroed
// 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
==================
*/
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;
qboolean 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
VectorNegate (angles, 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;
}
/*
===============================================================================
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);
Com_DPrintf ("warning: Vis 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;
Com_Error (ERR_DROP, "FloodArea_r: reflooded");
}
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);
}
}
/*
====================
FloodAreaConnections
====================
*/
void 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];
if (area->floodvalid == floodvalid)
continue; // already flooded into
floodnum++;
FloodArea_r (area, floodnum);
}
}
void CM_SetAreaPortalState (int portalnum, qboolean open)
{
if (portalnum > numareaportals)
Com_Error (ERR_DROP, "areaportal > numareaportals");
portalopen[portalnum] = open;
FloodAreaConnections ();
}
qboolean CM_AreasConnected (int area1, int area2)
{
if (map_noareas->value)
return true;
if (area1 > numareas || area2 > numareas)
Com_Error (ERR_DROP, "area > numareas");
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_WritePortalState
Writes the portal state to a savegame file
===================
*/
void CM_WritePortalState (FILE *f)
{
fwrite (portalopen, sizeof(portalopen), 1, f);
}
/*
===================
CM_ReadPortalState
Reads the portal state from a savegame file
and recalculates the area connections
===================
*/
void CM_ReadPortalState (FILE *f)
{
FS_Read (portalopen, sizeof(portalopen), f);
FloodAreaConnections ();
}
/*
=============
CM_HeadnodeVisible
Returns true if any leaf under headnode has a cluster that
is potentially visible
=============
*/
qboolean 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);
}