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quakeforge/tools/qfvis/source/qfvis.c

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/*
vis.c
PVS/PHS generation tool
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 2002 Colin Thompson
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((unused)) const char rcsid[] =
"$Id$";
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_IO_H
# include <io.h>
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <getopt.h>
#include <errno.h>
#include <stdlib.h>
#ifdef HAVE_PTHREAD_H
# include <pthread.h>
#endif
#include "QF/cmd.h"
#include "QF/bspfile.h"
#include "QF/dstring.h"
#include "QF/mathlib.h"
#include "QF/qtypes.h"
#include "QF/quakefs.h"
#include "QF/sys.h"
#include "vis.h"
#include "options.h"
#define MAX_THREADS 4
#ifdef HAVE_PTHREAD_H
pthread_mutex_t *my_mutex;
#endif
bsp_t *bsp;
options_t options;
int c_chains;
int c_mighttest;
int c_portaltest;
int c_portalpass;
int c_portalcheck;
int c_vistest;
int numportals;
int portalclusters;
int numrealleafs;
int originalvismapsize;
int totalvis;
int count_sep;
int bitbytes; // (portalleafs + 63)>>3
int bitlongs;
int bitbytes_l; // (numrealleafs + 63)>>3
portal_t *portals;
cluster_t *clusters;
dstring_t *visdata;
byte *uncompressed; // [bitbytes * portalleafs]
int *leafcluster; // leaf to cluster mappings as read from .prt file
static void
PlaneFromWinding (winding_t *winding, plane_t *plane)
{
vec3_t v1, v2;
// calc plane
VectorSubtract (winding->points[2], winding->points[1], v1);
VectorSubtract (winding->points[0], winding->points[1], v2);
CrossProduct (v2, v1, plane->normal);
_VectorNormalize (plane->normal);
plane->dist = DotProduct (winding->points[0], plane->normal);
}
winding_t *
NewWinding (int points)
{
winding_t *winding;
int size;
if (points > MAX_POINTS_ON_WINDING)
Sys_Error ("NewWinding: %i points", points);
size = (long) ((winding_t *) 0)->points[points];
winding = calloc (1, size);
return winding;
}
void
FreeWinding (winding_t *winding)
{
if (!winding->original)
free (winding);
}
winding_t *
CopyWinding (winding_t *winding)
{
int size;
winding_t *copy;
size = (long) ((winding_t *) 0)->points[winding->numpoints];
copy = malloc (size);
memcpy (copy, winding, size);
copy->original = false;
return copy;
}
/*
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)
{
int maxpts, i, j;
int sides[MAX_POINTS_ON_WINDING];
int counts[3];
vec_t dists[MAX_POINTS_ON_WINDING];
vec_t dot;
vec_t *p1, *p2;
vec3_t mid;
winding_t *neww;
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)
Sys_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.
*/
static 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_selected;
UNLOCK;
return p;
}
static void *
LeafThread (void *thread)
{
portal_t *portal;
do {
portal = GetNextPortal ();
if (!portal)
break;
PortalFlow (portal);
if (options.verbosity > 0)
printf ("portal:%4i mightsee:%4i cansee:%4i\n",
(int) (portal - portals),
portal->nummightsee,
portal->numcansee);
} while (1);
return NULL;
}
static int
CompressRow (byte *vis, byte *dest)
{
int j;
int rep;
int visrow;
byte *dest_p;
dest_p = dest;
visrow = (numrealleafs + 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;
}
static void
ClusterFlowExpand (byte *src, byte *dest)
{
int i, j;
for (j = 1, i = 0; i < numrealleafs; i++) {
if (src[leafcluster[i] >> 3] & (1 << (leafcluster[i] & 7)))
*dest |= j;
j <<= 1;
if (j == 256) {
j = 1;
dest++;
}
}
}
/*
ClusterFlow
Builds the entire visibility list for a cluster
*/
void
ClusterFlow (int clusternum)
{
byte *outbuffer;
byte compressed[MAX_MAP_LEAFS / 8];
int numvis, i, j;
cluster_t *cluster;
portal_t *portal;
outbuffer = uncompressed + clusternum * bitbytes_l;
cluster = &clusters[clusternum];
// flow through all portals, collecting visible bits
memset (compressed, 0, sizeof (compressed));
for (i = 0; i < cluster->numportals; i++) {
portal = cluster->portals[i];
if (portal->status != stat_done)
Sys_Error ("portal not done");
for (j = 0; j < bitbytes; j++)
compressed[j] |= portal->visbits[j];
}
if (compressed[clusternum >> 3] & (1 << (clusternum & 7)))
Sys_Error ("Cluster portals saw into cluster");
compressed[clusternum >> 3] |= (1 << (clusternum & 7));
numvis = 0;
for (i = 0; i < portalclusters; i++)
if (compressed[i >> 3] & (1 << (i & 3)))
numvis++;
// expand to cluster->leaf PVS
ClusterFlowExpand (compressed, outbuffer);
// compress the bit string
if (options.verbosity > 0)
printf ("cluster %4i : %4i visible\n", clusternum, numvis);
totalvis += numvis;
i = CompressRow (outbuffer, compressed);
cluster->visofs = visdata->size;
dstring_append (visdata, compressed, i);
}
static void
CalcPortalVis (void)
{
long i;
// fastvis just uses mightsee for a very loose bound
if (options.minimal) {
for (i = 0; i < numportals * 2; i++) {
portals[i].visbits = portals[i].mightsee;
portals[i].status = stat_done;
}
return;
}
#ifdef HAVE_PTHREAD_H
{
pthread_t work_threads[MAX_THREADS];
void *status;
pthread_attr_t attrib;
if (options.threads > 1) {
my_mutex = malloc (sizeof (*my_mutex));
if (pthread_mutex_init (my_mutex, 0) == -1)
Sys_Error ("pthread_mutex_init failed");
if (pthread_attr_init (&attrib) == -1)
Sys_Error ("pthread_attr_create failed");
if (pthread_attr_setstacksize (&attrib, 0x100000) == -1)
Sys_Error ("pthread_attr_setstacksize failed");
for (i = 0; i < options.threads; i++) {
if (pthread_create (&work_threads[i], &attrib, LeafThread,
(void *) i) == -1)
Sys_Error ("pthread_create failed");
}
for (i = 0; i < options.threads; i++) {
if (pthread_join (work_threads[i], &status) == -1)
Sys_Error ("pthread_join failed");
}
if (pthread_mutex_destroy (my_mutex) == -1)
Sys_Error ("pthread_mutex_destroy failed");
} else {
LeafThread (0);
}
}
#else
LeafThread (0);
#endif
if (options.verbosity > 0) {
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);
}
}
static void
CalcVis (void)
{
int i;
BasePortalVis ();
CalcPortalVis ();
// assemble the leaf vis lists by oring and compressing the portal lists
for (i = 0; i < portalclusters; i++)
ClusterFlow (i);
for (i = 0; i < numrealleafs; i++) {
bsp->leafs[i].visofs = clusters[leafcluster[i]].visofs;
}
if (options.verbosity >= 0)
printf ("average clusters visible: %i\n", totalvis / portalclusters);
}
#if 0
static 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;
}
static sep_t *
FindPassages (winding_t *source, winding_t *pass)
{
double length;
float d;
int counts[3];
int i, j, k, l;
plane_t plane;
qboolean fliptest;
sep_t *sep, *list;
vec3_t v1, v2;
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);
// find 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;
}
static void
CalcPassages (void)
{
int count, count2, i, j, k;
leaf_t *leaf;
portal_t *p1, *p2;
sep_t *sep;
passage_t *passages;
if (options.verbosity >= 0)
printf ("building passages...\n");
count = count2 = 0;
for (i = 0; i < portalleafs; i++) {
leaf = &leafs[i];
for (j = 0; j < leaf->numportals; j++) {
p1 = leaf->portals[j];
for (k = 0; k < leaf->numportals; k++) {
if (k == j)
continue;
count++;
p2 = leaf->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) {
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 = leaf->passages;
leaf->passages = passages;
}
}
}
if (options.verbosity >= 0) {
printf ("numpassages: %i (%i)\n", count2, count);
printf ("total passages: %i\n", count_sep);
}
}
#endif
static void
LoadPortals (char *name)
{
char magic[80];
FILE *f;
int clusternums[2];
int numpoints, i, j;
cluster_t *cluster;
plane_t plane;
portal_t *portal;
winding_t *winding;
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%i\n", magic, &portalclusters, &numportals,
&numrealleafs) != 4)
Sys_Error ("LoadPortals: failed to read header");
if (strcmp (magic, PORTALFILE))
Sys_Error ("LoadPortals: not a portal file");
if (options.verbosity >= 0) {
printf ("%4i portalclusters\n", portalclusters);
printf ("%4i numportals\n", numportals);
printf ("%4i numrealleafs\n", numrealleafs);
}
bitbytes = ((portalclusters + 63) & ~63) >> 3;
bitlongs = bitbytes / sizeof (long);
bitbytes_l = ((numrealleafs + 63) & ~63) >> 3;
// each file portal is split into two memory portals, one for each
// direction
portals = calloc (2 * numportals, sizeof (portal_t));
clusters = calloc (portalclusters, sizeof (cluster_t));
originalvismapsize = numrealleafs * ((numrealleafs + 7) / 8);
for (i = 0, portal = portals; i < numportals; i++) {
if (fscanf (f, "%i %i %i ", &numpoints, &clusternums[0],
&clusternums[1]) != 3)
Sys_Error ("LoadPortals: reading portal %i", i);
if (numpoints > MAX_POINTS_ON_WINDING)
Sys_Error ("LoadPortals: portal %i has too many points", i);
if ((unsigned) clusternums[0] > portalclusters
|| (unsigned) clusternums[1] > portalclusters)
Sys_Error ("LoadPortals: reading portal %i", i);
winding = portal->winding = NewWinding (numpoints);
winding->original = true;
winding->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)
Sys_Error ("LoadPortals: reading portal %i", i);
for (k = 0; k < 3; k++)
winding->points[j][k] = v[k];
}
fscanf (f, "\n");
// calc plane
PlaneFromWinding (winding, &plane);
// create forward portal
cluster = &clusters[clusternums[0]];
if (cluster->numportals == MAX_PORTALS_ON_CLUSTER)
Sys_Error ("Cluster with too many portals");
cluster->portals[cluster->numportals] = portal;
cluster->numportals++;
portal->winding = winding;
VectorSubtract (vec3_origin, plane.normal, portal->plane.normal);
portal->plane.dist = -plane.dist;
portal->cluster = clusternums[1];
portal++;
// create backwards portal
cluster = &clusters[clusternums[1]];
if (cluster->numportals == MAX_PORTALS_ON_CLUSTER)
Sys_Error ("Cluster with too many portals");
cluster->portals[cluster->numportals] = portal;
cluster->numportals++;
portal->winding = winding;
portal->plane = plane;
portal->cluster = clusternums[0];
portal++;
}
leafcluster = calloc (numrealleafs, sizeof (int));
for (i = 0; i < numrealleafs; i++)
if (fscanf (f, "%i\n", &leafcluster[i]) != 1)
Sys_Error ("LoadPortals: parse error in leaf->cluster mappings");
fclose (f);
}
int
main (int argc, char **argv)
{
double start, stop;
dstring_t *portalfile = dstring_new ();
QFile *f;
start = Sys_DoubleTime ();
this_program = argv[0];
DecodeArgs (argc, argv);
if (!options.bspfile) {
Sys_Error ("%s: no bsp file specified.", this_program);
usage (1);
}
COM_StripExtension (options.bspfile, options.bspfile);
COM_DefaultExtension (options.bspfile, ".bsp");
f = Qopen (options.bspfile, "rb");
bsp = LoadBSPFile (f, Qfilesize (f));
Qclose (f);
visdata = dstring_new ();
portalfile->size = strlen (options.bspfile) + 1;
dstring_adjust (portalfile);
COM_StripExtension (options.bspfile, portalfile->str);
dstring_appendstr (portalfile, ".prt");
LoadPortals (portalfile->str);
uncompressed = calloc (bitbytes_l, portalclusters);
CalcVis ();
if (options.verbosity >= 0)
printf ("c_chains: %i%s\n", c_chains,
options.threads > 1 ? " (not reliable)" :"");
BSP_AddVisibility (bsp, visdata->str, visdata->size);
if (options.verbosity >= 0)
printf ("visdatasize:%i compressed from %i\n", bsp->visdatasize,
originalvismapsize);
CalcAmbientSounds ();
f = Qopen (options.bspfile, "wb");
WriteBSPFile (bsp, f);
Qclose (f);
stop = Sys_DoubleTime ();
if (options.verbosity >= 0)
printf ("%5.1f seconds elapsed\n", stop - start);
return 0;
}
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