mirror of
https://git.code.sf.net/p/quake/quakeforge
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136 lines
3 KiB
C
136 lines
3 KiB
C
/*
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base-vis.c
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PVS PHS generator tool
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Copyright (C) 1996-1997 Id Software, Inc.
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Copyright (C) 2002 Colin Thompson
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((used)) const char rcsid[] =
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"$Id$";
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#include <getopt.h>
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_IO_H
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# include <io.h>
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include <getopt.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include "QF/bspfile.h"
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#include "QF/cmd.h"
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#include "QF/mathlib.h"
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#include "QF/quakefs.h"
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#include "QF/sys.h"
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#include "vis.h"
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#include "options.h"
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static int clustersee;
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static byte portalsee[MAX_PORTALS];
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/*
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This is a rough first-order aproximation that is used to trivially reject
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some of the final calculations.
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*/
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static void
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SimpleFlood (portal_t *srcportal, int clusternum)
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{
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int i;
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cluster_t *cluster;
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portal_t *portal;
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if (srcportal->mightsee[clusternum >> 3] & (1 << (clusternum & 7)))
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return;
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srcportal->mightsee[clusternum >> 3] |= (1 << (clusternum & 7));
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clustersee++;
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cluster = &clusters[clusternum];
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for (i = 0; i < cluster->numportals; i++) {
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portal = cluster->portals[i];
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if (!portalsee[portal - portals])
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continue;
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SimpleFlood (srcportal, portal->cluster);
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}
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}
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void
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BasePortalVis (void)
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{
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int i, j, k;
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float d;
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portal_t *tp, *portal;
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winding_t *winding;
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for (i = 0, portal = portals; i < numportals * 2; i++, portal++) {
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portal->mightsee = calloc (1, bitbytes);
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memset (portalsee, 0, numportals * 2);
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for (j = 0, tp = portals; j < numportals * 2; j++, tp++) {
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if (j == i)
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continue;
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winding = tp->winding;
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for (k = 0; k < winding->numpoints; k++) {
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d = DotProduct (winding->points[k],
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portal->plane.normal) - portal->plane.dist;
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if (d > ON_EPSILON)
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break;
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}
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if (k == winding->numpoints)
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continue; // no points on front
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winding = portal->winding;
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for (k = 0; k < winding->numpoints; k++) {
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d = DotProduct (winding->points[k],
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tp->plane.normal) - tp->plane.dist;
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if (d < -ON_EPSILON)
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break;
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}
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if (k == winding->numpoints)
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continue; // no points on front
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portalsee[j] = 1;
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}
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clustersee = 0;
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SimpleFlood (portal, portal->cluster);
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portal->nummightsee = clustersee;
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}
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}
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