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PC World Komputer 1996 December
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PCWKCD1296.iso
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sharewar
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quake106
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utils
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vis
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vis.c
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C/C++ Source or Header
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1996-09-12
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964 lines
// vis.c
#include "vis.h"
#define MAX_THREADS 4
int numportals;
int portalleafs;
portal_t *portals;
leaf_t *leafs;
int c_portaltest, c_portalpass, c_portalcheck;
qboolean showgetleaf = true;
int leafon; // the next leaf to be given to a thread to process
#ifdef __alpha
pthread_mutex_t *my_mutex;
#endif
byte *vismap, *vismap_p, *vismap_end; // past visfile
int originalvismapsize;
byte *uncompressed; // [bitbytes*portalleafs]
int bitbytes; // (portalleafs+63)>>3
int bitlongs;
#ifdef __alpha
int numthreads = 4;
#else
int numthreads = 1;
#endif
qboolean fastvis;
qboolean verbose;
int testlevel = 2;
#if 0
void NormalizePlane (plane_t *dp)
{
vec_t ax, ay, az;
if (dp->normal[0] == -1.0)
{
dp->normal[0] = 1.0;
dp->dist = -dp->dist;
return;
}
if (dp->normal[1] == -1.0)
{
dp->normal[1] = 1.0;
dp->dist = -dp->dist;
return;
}
if (dp->normal[2] == -1.0)
{
dp->normal[2] = 1.0;
dp->dist = -dp->dist;
return;
}
ax = fabs(dp->normal[0]);
ay = fabs(dp->normal[1]);
az = fabs(dp->normal[2]);
if (ax >= ay && ax >= az)
{
if (dp->normal[0] < 0)
{
VectorSubtract (vec3_origin, dp->normal, dp->normal);
dp->dist = -dp->dist;
}
return;
}
if (ay >= ax && ay >= az)
{
if (dp->normal[1] < 0)
{
VectorSubtract (vec3_origin, dp->normal, dp->normal);
dp->dist = -dp->dist;
}
return;
}
if (dp->normal[2] < 0)
{
VectorSubtract (vec3_origin, dp->normal, dp->normal);
dp->dist = -dp->dist;
}
}
#endif
void PlaneFromWinding (winding_t *w, plane_t *plane)
{
vec3_t v1, v2;
// calc plane
VectorSubtract (w->points[2], w->points[1], v1);
VectorSubtract (w->points[0], w->points[1], v2);
CrossProduct (v2, v1, plane->normal);
VectorNormalize (plane->normal);
plane->dist = DotProduct (w->points[0], plane->normal);
}
//=============================================================================
/*
==================
NewWinding
==================
*/
winding_t *NewWinding (int points)
{
winding_t *w;
int size;
if (points > MAX_POINTS_ON_WINDING)
Error ("NewWinding: %i points", points);
size = (int)((winding_t *)0)->points[points];
w = malloc (size);
memset (w, 0, size);
return w;
}
void FreeWinding (winding_t *w)
{
if (!w->original)
free (w);
}
void pw(winding_t *w)
{
int i;
for (i=0 ; i<w->numpoints ; i++)
printf ("(%5.1f, %5.1f, %5.1f)\n",w->points[i][0], w->points[i][1],w->points[i][2]);
}
void prl(leaf_t *l)
{
int i;
portal_t *p;
plane_t pl;
for (i=0 ; i<l->numportals ; i++)
{
p = l->portals[i];
pl = p->plane;
printf ("portal %4i to leaf %4i : %7.1f : (%4.1f, %4.1f, %4.1f)\n",(int)(p-portals),p->leaf,pl.dist, pl.normal[0], pl.normal[1], pl.normal[2]);
}
}
/*
==================
CopyWinding
==================
*/
winding_t *CopyWinding (winding_t *w)
{
int size;
winding_t *c;
size = (int)((winding_t *)0)->points[w->numpoints];
c = malloc (size);
memcpy (c, w, size);
c->original = false;
return c;
}
/*
==================
ClipWinding
Clips the winding to the plane, returning the new winding on the positive side
Frees the input winding.
If keepon is true, an exactly on-plane winding will be saved, otherwise
it will be clipped away.
==================
*/
winding_t *ClipWinding (winding_t *in, plane_t *split, qboolean keepon)
{
vec_t dists[MAX_POINTS_ON_WINDING];
int sides[MAX_POINTS_ON_WINDING];
int counts[3];
vec_t dot;
int i, j;
vec_t *p1, *p2;
vec3_t mid;
winding_t *neww;
int maxpts;
counts[0] = counts[1] = counts[2] = 0;
// determine sides for each point
for (i=0 ; i<in->numpoints ; i++)
{
dot = DotProduct (in->points[i], split->normal);
dot -= split->dist;
dists[i] = dot;
if (dot > ON_EPSILON)
sides[i] = SIDE_FRONT;
else if (dot < -ON_EPSILON)
sides[i] = SIDE_BACK;
else
{
sides[i] = SIDE_ON;
}
counts[sides[i]]++;
}
sides[i] = sides[0];
dists[i] = dists[0];
if (keepon && !counts[0] && !counts[1])
return in;
if (!counts[0])
{
FreeWinding (in);
return NULL;
}
if (!counts[1])
return in;
maxpts = in->numpoints+4; // can't use counts[0]+2 because
// of fp grouping errors
neww = NewWinding (maxpts);
for (i=0 ; i<in->numpoints ; i++)
{
p1 = in->points[i];
if (sides[i] == SIDE_ON)
{
VectorCopy (p1, neww->points[neww->numpoints]);
neww->numpoints++;
continue;
}
if (sides[i] == SIDE_FRONT)
{
VectorCopy (p1, neww->points[neww->numpoints]);
neww->numpoints++;
}
if (sides[i+1] == SIDE_ON || sides[i+1] == sides[i])
continue;
// generate a split point
p2 = in->points[(i+1)%in->numpoints];
dot = dists[i] / (dists[i]-dists[i+1]);
for (j=0 ; j<3 ; j++)
{ // avoid round off error when possible
if (split->normal[j] == 1)
mid[j] = split->dist;
else if (split->normal[j] == -1)
mid[j] = -split->dist;
else
mid[j] = p1[j] + dot*(p2[j]-p1[j]);
}
VectorCopy (mid, neww->points[neww->numpoints]);
neww->numpoints++;
}
if (neww->numpoints > maxpts)
Error ("ClipWinding: points exceeded estimate");
// free the original winding
FreeWinding (in);
return neww;
}
//=============================================================================
/*
=============
GetNextPortal
Returns the next portal for a thread to work on
Returns the portals from the least complex, so the later ones can reuse
the earlier information.
=============
*/
portal_t *GetNextPortal (void)
{
int j;
portal_t *p, *tp;
int min;
LOCK;
min = 99999;
p = NULL;
for (j=0, tp = portals ; j<numportals*2 ; j++, tp++)
{
if (tp->nummightsee < min && tp->status == stat_none)
{
min = tp->nummightsee;
p = tp;
}
}
if (p)
p->status = stat_working;
UNLOCK;
return p;
}
/*
==============
LeafThread
==============
*/
#ifdef __alpha
pthread_addr_t LeafThread (pthread_addr_t thread)
#else
void *LeafThread (int thread)
#endif
{
portal_t *p;
//printf ("Begining LeafThread: %i\n",(int)thread);
do
{
p = GetNextPortal ();
if (!p)
break;
PortalFlow (p);
if (verbose)
printf ("portal:%4i mightsee:%4i cansee:%4i\n", (int)(p - portals), p->nummightsee, p->numcansee);
} while (1);
//printf ("Completed LeafThread: %i\n",(int)thread);
return NULL;
}
/*
===============
CompressRow
===============
*/
int CompressRow (byte *vis, byte *dest)
{
int j;
int rep;
int visrow;
byte *dest_p;
dest_p = dest;
visrow = (portalleafs + 7)>>3;
for (j=0 ; j<visrow ; j++)
{
*dest_p++ = vis[j];
if (vis[j])
continue;
rep = 1;
for ( j++; j<visrow ; j++)
if (vis[j] || rep == 255)
break;
else
rep++;
*dest_p++ = rep;
j--;
}
return dest_p - dest;
}
/*
===============
LeafFlow
Builds the entire visibility list for a leaf
===============
*/
int totalvis;
void LeafFlow (int leafnum)
{
leaf_t *leaf;
byte *outbuffer;
byte compressed[MAX_MAP_LEAFS/8];
int i, j;
int numvis;
byte *dest;
portal_t *p;
//
// flow through all portals, collecting visible bits
//
outbuffer = uncompressed + leafnum*bitbytes;
leaf = &leafs[leafnum];
for (i=0 ; i<leaf->numportals ; i++)
{
p = leaf->portals[i];
if (p->status != stat_done)
Error ("portal not done");
for (j=0 ; j<bitbytes ; j++)
outbuffer[j] |= p->visbits[j];
}
if (outbuffer[leafnum>>3] & (1<<(leafnum&7)))
Error ("Leaf portals saw into leaf");
outbuffer[leafnum>>3] |= (1<<(leafnum&7));
numvis = 0;
for (i=0 ; i<portalleafs ; i++)
if (outbuffer[i>>3] & (1<<(i&3)))
numvis++;
//
// compress the bit string
//
if (verbose)
printf ("leaf %4i : %4i visible\n", leafnum, numvis);
totalvis += numvis;
#if 0
i = (portalleafs+7)>>3;
memcpy (compressed, outbuffer, i);
#else
i = CompressRow (outbuffer, compressed);
#endif
dest = vismap_p;
vismap_p += i;
if (vismap_p > vismap_end)
Error ("Vismap expansion overflow");
dleafs[leafnum+1].visofs = dest-vismap; // leaf 0 is a common solid
memcpy (dest, compressed, i);
}
/*
==================
CalcPortalVis
==================
*/
void CalcPortalVis (void)
{
int i;
// fastvis just uses mightsee for a very loose bound
if (fastvis)
{
for (i=0 ; i<numportals*2 ; i++)
{
portals[i].visbits = portals[i].mightsee;
portals[i].status = stat_done;
}
return;
}
leafon = 0;
#ifdef __alpha
{
pthread_t work_threads[MAX_THREADS];
pthread_addr_t status;
pthread_attr_t attrib;
pthread_mutexattr_t mattrib;
int i;
my_mutex = malloc (sizeof(*my_mutex));
if (pthread_mutexattr_create (&mattrib) == -1)
Error ("pthread_mutex_attr_create failed");
if (pthread_mutexattr_setkind_np (&mattrib, MUTEX_FAST_NP) == -1)
Error ("pthread_mutexattr_setkind_np failed");
if (pthread_mutex_init (my_mutex, mattrib) == -1)
Error ("pthread_mutex_init failed");
if (pthread_attr_create (&attrib) == -1)
Error ("pthread_attr_create failed");
if (pthread_attr_setstacksize (&attrib, 0x100000) == -1)
Error ("pthread_attr_setstacksize failed");
for (i=0 ; i<numthreads ; i++)
{
if (pthread_create(&work_threads[i], attrib
, LeafThread, (pthread_addr_t)i) == -1)
Error ("pthread_create failed");
}
for (i=0 ; i<numthreads ; i++)
{
if (pthread_join (work_threads[i], &status) == -1)
Error ("pthread_join failed");
}
if (pthread_mutex_destroy (my_mutex) == -1)
Error ("pthread_mutex_destroy failed");
}
#else
LeafThread (0);
#endif
if (verbose)
{
printf ("portalcheck: %i portaltest: %i portalpass: %i\n",c_portalcheck, c_portaltest, c_portalpass);
printf ("c_vistest: %i c_mighttest: %i\n",c_vistest, c_mighttest);
}
}
/*
==================
CalcVis
==================
*/
void CalcVis (void)
{
int i;
BasePortalVis ();
CalcPortalVis ();
//
// assemble the leaf vis lists by oring and compressing the portal lists
//
for (i=0 ; i<portalleafs ; i++)
LeafFlow (i);
printf ("average leafs visible: %i\n", totalvis / portalleafs);
}
/*
==============================================================================
PASSAGE CALCULATION (not used yet...)
==============================================================================
*/
int count_sep;
qboolean PlaneCompare (plane_t *p1, plane_t *p2)
{
int i;
if ( fabs(p1->dist - p2->dist) > 0.01)
return false;
for (i=0 ; i<3 ; i++)
if ( fabs(p1->normal[i] - p2->normal[i] ) > 0.001)
return false;
return true;
}
sep_t *Findpassages (winding_t *source, winding_t *pass)
{
int i, j, k, l;
plane_t plane;
vec3_t v1, v2;
float d;
double length;
int counts[3];
qboolean fliptest;
sep_t *sep, *list;
list = NULL;
// check all combinations
for (i=0 ; i<source->numpoints ; i++)
{
l = (i+1)%source->numpoints;
VectorSubtract (source->points[l] , source->points[i], v1);
// fing a vertex of pass that makes a plane that puts all of the
// vertexes of pass on the front side and all of the vertexes of
// source on the back side
for (j=0 ; j<pass->numpoints ; j++)
{
VectorSubtract (pass->points[j], source->points[i], v2);
plane.normal[0] = v1[1]*v2[2] - v1[2]*v2[1];
plane.normal[1] = v1[2]*v2[0] - v1[0]*v2[2];
plane.normal[2] = v1[0]*v2[1] - v1[1]*v2[0];
// if points don't make a valid plane, skip it
length = plane.normal[0] * plane.normal[0]
+ plane.normal[1] * plane.normal[1]
+ plane.normal[2] * plane.normal[2];
if (length < ON_EPSILON)
continue;
length = 1/sqrt(length);
plane.normal[0] *= length;
plane.normal[1] *= length;
plane.normal[2] *= length;
plane.dist = DotProduct (pass->points[j], plane.normal);
//
// find out which side of the generated seperating plane has the
// source portal
//
fliptest = false;
for (k=0 ; k<source->numpoints ; k++)
{
if (k == i || k == l)
continue;
d = DotProduct (source->points[k], plane.normal) - plane.dist;
if (d < -ON_EPSILON)
{ // source is on the negative side, so we want all
// pass and target on the positive side
fliptest = false;
break;
}
else if (d > ON_EPSILON)
{ // source is on the positive side, so we want all
// pass and target on the negative side
fliptest = true;
break;
}
}
if (k == source->numpoints)
continue; // planar with source portal
//
// flip the normal if the source portal is backwards
//
if (fliptest)
{
VectorSubtract (vec3_origin, plane.normal, plane.normal);
plane.dist = -plane.dist;
}
//
// if all of the pass portal points are now on the positive side,
// this is the seperating plane
//
counts[0] = counts[1] = counts[2] = 0;
for (k=0 ; k<pass->numpoints ; k++)
{
if (k==j)
continue;
d = DotProduct (pass->points[k], plane.normal) - plane.dist;
if (d < -ON_EPSILON)
break;
else if (d > ON_EPSILON)
counts[0]++;
else
counts[2]++;
}
if (k != pass->numpoints)
continue; // points on negative side, not a seperating plane
if (!counts[0])
continue; // planar with pass portal
//
// save this out
//
count_sep++;
sep = malloc(sizeof(*sep));
sep->next = list;
list = sep;
sep->plane = plane;
}
}
return list;
}
/*
============
CalcPassages
============
*/
void CalcPassages (void)
{
int i, j, k;
int count, count2;
leaf_t *l;
portal_t *p1, *p2;
sep_t *sep;
passage_t *passages;
printf ("building passages...\n");
count = count2 = 0;
for (i=0 ; i<portalleafs ; i++)
{
l = &leafs[i];
for (j=0 ; j<l->numportals ; j++)
{
p1 = l->portals[j];
for (k=0 ; k<l->numportals ; k++)
{
if (k==j)
continue;
count++;
p2 = l->portals[k];
// definately can't see into a coplanar portal
if (PlaneCompare (&p1->plane, &p2->plane) )
continue;
count2++;
sep = Findpassages (p1->winding, p2->winding);
if (!sep)
{
// Error ("No seperating planes found in portal pair");
count_sep++;
sep = malloc(sizeof(*sep));
sep->next = NULL;
sep->plane = p1->plane;
}
passages = malloc(sizeof(*passages));
passages->planes = sep;
passages->from = p1->leaf;
passages->to = p2->leaf;
passages->next = l->passages;
l->passages = passages;
}
}
}
printf ("numpassages: %i (%i)\n", count2, count);
printf ("total passages: %i\n", count_sep);
}
//=============================================================================
/*
============
LoadPortals
============
*/
void LoadPortals (char *name)
{
int i, j;
portal_t *p;
leaf_t *l;
char magic[80];
FILE *f;
int numpoints;
winding_t *w;
int leafnums[2];
plane_t plane;
if (!strcmp(name,"-"))
f = stdin;
else
{
f = fopen(name, "r");
if (!f)
{
printf ("LoadPortals: couldn't read %s\n",name);
printf ("No vising performed.\n");
exit (1);
}
}
if (fscanf (f,"%79s\n%i\n%i\n",magic, &portalleafs, &numportals) != 3)
Error ("LoadPortals: failed to read header");
if (strcmp(magic,PORTALFILE))
Error ("LoadPortals: not a portal file");
printf ("%4i portalleafs\n", portalleafs);
printf ("%4i numportals\n", numportals);
bitbytes = ((portalleafs+63)&~63)>>3;
bitlongs = bitbytes/sizeof(long);
// each file portal is split into two memory portals
portals = malloc(2*numportals*sizeof(portal_t));
memset (portals, 0, 2*numportals*sizeof(portal_t));
leafs = malloc(portalleafs*sizeof(leaf_t));
memset (leafs, 0, portalleafs*sizeof(leaf_t));
originalvismapsize = portalleafs*((portalleafs+7)/8);
vismap = vismap_p = dvisdata;
vismap_end = vismap + MAX_MAP_VISIBILITY;
for (i=0, p=portals ; i<numportals ; i++)
{
if (fscanf (f, "%i %i %i ", &numpoints, &leafnums[0], &leafnums[1])
!= 3)
Error ("LoadPortals: reading portal %i", i);
if (numpoints > MAX_POINTS_ON_WINDING)
Error ("LoadPortals: portal %i has too many points", i);
if ( (unsigned)leafnums[0] > portalleafs
|| (unsigned)leafnums[1] > portalleafs)
Error ("LoadPortals: reading portal %i", i);
w = p->winding = NewWinding (numpoints);
w->original = true;
w->numpoints = numpoints;
for (j=0 ; j<numpoints ; j++)
{
double v[3];
int k;
// scanf into double, then assign to vec_t
if (fscanf (f, "(%lf %lf %lf ) "
, &v[0], &v[1], &v[2]) != 3)
Error ("LoadPortals: reading portal %i", i);
for (k=0 ; k<3 ; k++)
w->points[j][k] = v[k];
}
fscanf (f, "\n");
// calc plane
PlaneFromWinding (w, &plane);
// create forward portal
l = &leafs[leafnums[0]];
if (l->numportals == MAX_PORTALS_ON_LEAF)
Error ("Leaf with too many portals");
l->portals[l->numportals] = p;
l->numportals++;
p->winding = w;
VectorSubtract (vec3_origin, plane.normal, p->plane.normal);
p->plane.dist = -plane.dist;
p->leaf = leafnums[1];
p++;
// create backwards portal
l = &leafs[leafnums[1]];
if (l->numportals == MAX_PORTALS_ON_LEAF)
Error ("Leaf with too many portals");
l->portals[l->numportals] = p;
l->numportals++;
p->winding = w;
p->plane = plane;
p->leaf = leafnums[0];
p++;
}
fclose (f);
}
/*
===========
main
===========
*/
int main (int argc, char **argv)
{
char portalfile[1024];
char source[1024];
int i;
double start, end;
printf ("---- vis ----\n");
for (i=1 ; i<argc ; i++)
{
if (!strcmp(argv[i],"-threads"))
{
numthreads = atoi (argv[i+1]);
i++;
}
else if (!strcmp(argv[i], "-fast"))
{
printf ("fastvis = true\n");
fastvis = true;
}
else if (!strcmp(argv[i], "-level"))
{
testlevel = atoi(argv[i+1]);
printf ("testlevel = %i\n", testlevel);
i++;
}
else if (!strcmp(argv[i], "-v"))
{
printf ("verbose = true\n");
verbose = true;
}
else if (argv[i][0] == '-')
Error ("Unknown option \"%s\"", argv[i]);
else
break;
}
if (i != argc - 1)
Error ("usage: vis [-threads #] [-level 0-4] [-fast] [-v] bspfile");
start = I_FloatTime ();
strcpy (source, argv[i]);
StripExtension (source);
DefaultExtension (source, ".bsp");
LoadBSPFile (source);
strcpy (portalfile, argv[i]);
StripExtension (portalfile);
strcat (portalfile, ".prt");
LoadPortals (portalfile);
uncompressed = malloc(bitbytes*portalleafs);
memset (uncompressed, 0, bitbytes*portalleafs);
// CalcPassages ();
CalcVis ();
printf ("c_chains: %i\n",c_chains);
visdatasize = vismap_p - dvisdata;
printf ("visdatasize:%i compressed from %i\n", visdatasize, originalvismapsize);
CalcAmbientSounds ();
WriteBSPFile (source);
// unlink (portalfile);
end = I_FloatTime ();
printf ("%5.1f seconds elapsed\n", end-start);
return 0;
}