/* 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 #endif #ifdef HAVE_IO_H # include #endif #ifdef HAVE_STRING_H # include #endif #ifdef HAVE_STRINGS_H # include #endif #include #include #include #ifdef HAVE_PTHREAD_H # include #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) { static int count; printf ("%5d / %5d %d\r", count++, numportals * 2, p->nummightsee); fflush (stdout); 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 + 1].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) { VectorNegate (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] > (unsigned) portalclusters || (unsigned) clusternums[1] > (unsigned) 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; VectorNegate (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) { usage (1); Sys_Error ("%s: no bsp file specified.", this_program); } QFS_StripExtension (options.bspfile, options.bspfile); QFS_DefaultExtension (options.bspfile, ".bsp"); f = Qopen (options.bspfile, "rb"); if (!f) Sys_Error ("couldn't open %s for reading.", options.bspfile); bsp = LoadBSPFile (f, Qfilesize (f)); Qclose (f); visdata = dstring_new (); portalfile->size = strlen (options.bspfile) + 1; dstring_adjust (portalfile); QFS_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"); if (!f) Sys_Error ("couldn't open %s for writing.", options.bspfile); WriteBSPFile (bsp, f); Qclose (f); stop = Sys_DoubleTime (); if (options.verbosity >= 0) printf ("%5.1f seconds elapsed\n", stop - start); return 0; }