mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-30 08:00:51 +00:00
253 lines
7.2 KiB
C
253 lines
7.2 KiB
C
/*
|
|
base-vis.c
|
|
|
|
PVS PHS generator 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
|
|
|
|
#include <getopt.h>
|
|
#include <stdlib.h>
|
|
#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 <string.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "QF/bspfile.h"
|
|
#include "QF/cmd.h"
|
|
#include "QF/mathlib.h"
|
|
#include "QF/quakefs.h"
|
|
#include "QF/sys.h"
|
|
|
|
#include "tools/qfvis/include/vis.h"
|
|
#include "tools/qfvis/include/options.h"
|
|
|
|
/*
|
|
This is a rough first-order aproximation that is used to trivially reject
|
|
some of the final calculations.
|
|
*/
|
|
static void
|
|
SimpleFlood (basethread_t *thread, portal_t *srcportal, int clusternum)
|
|
{
|
|
int i;
|
|
cluster_t *cluster;
|
|
portal_t *portal;
|
|
|
|
if (set_is_member (srcportal->mightsee, clusternum))
|
|
return;
|
|
set_add (srcportal->mightsee, clusternum);
|
|
thread->clustersee++;
|
|
|
|
cluster = &clusters[clusternum];
|
|
|
|
for (i = 0; i < cluster->numportals; i++) {
|
|
portal = &cluster->portals[i];
|
|
if (!set_is_member (thread->portalsee, portal - portals))
|
|
continue;
|
|
SimpleFlood (thread, srcportal, portal->cluster);
|
|
}
|
|
}
|
|
|
|
static inline int
|
|
test_sphere (const vspheref_t *sphere, vec4f_t plane)
|
|
{
|
|
#ifdef __SSE3__
|
|
const vec4f_t zero = {};
|
|
float r = sphere->radius;
|
|
vec4f_t eps = { r, r, r, r };
|
|
vec4f_t d = _mm_addsub_ps (zero, dotf (sphere->center, plane));
|
|
vec4i_t c = (d - eps) >= 0;
|
|
|
|
c = (vec4i_t) _mm_hsub_epi32 ((__m128i) c, (__m128i) c);
|
|
return c[0];
|
|
#else
|
|
float d = DotProduct (sphere->center, plane) + plane[3];
|
|
int front = (d >= sphere->radius);
|
|
int back = (d <= -sphere->radius);
|
|
return front - back;
|
|
#endif
|
|
}
|
|
|
|
static int __attribute__ ((pure))
|
|
test_winding_front (const winding_t *winding, vec4f_t plane)
|
|
{
|
|
for (unsigned i = 0; i < winding->numpoints; i++) {
|
|
vec4f_t d = dotf (winding->points[i], plane);
|
|
if (d[0] > ON_EPSILON)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __attribute__ ((pure))
|
|
test_winding_back (const winding_t *winding, vec4f_t plane)
|
|
{
|
|
for (unsigned i = 0; i < winding->numpoints; i++) {
|
|
vec4f_t d = dotf (winding->points[i], plane);
|
|
if (d[0] < -ON_EPSILON)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
PortalBase (basethread_t *thread, portal_t *portal)
|
|
{
|
|
portal_t *tp;
|
|
cluster_t *cluster;
|
|
int tp_side, portal_side;
|
|
|
|
for (cluster = clusters; cluster < clusters + portalclusters; cluster++) {
|
|
int side = test_sphere (&cluster->sphere, portal->plane);
|
|
|
|
if (side < 0) {
|
|
thread->clustertest += cluster->numportals;
|
|
// The cluster is entirely behind the portal's plane, thus every
|
|
// portal in the cluster is also behind the portal's plane and
|
|
// cannot be seen at all.
|
|
thread->clustercull += cluster->numportals;
|
|
} else if (side > 0) {
|
|
// The cluster is entirely in front of the portal's plane, thus
|
|
// every portal in the cluster is also in front of the portal's
|
|
// plane and may be seen. However, as portals are one-way (ie,
|
|
// can see out the portal along its plane normal, but not into
|
|
// the portal against its plane normal), the current portal
|
|
// must be behind the cluster's portal, or straddle its plane,
|
|
// for a cluster's portal to be considered visible.
|
|
thread->clustertest += cluster->numportals;
|
|
for (int i = 0; i < cluster->numportals; i++) {
|
|
tp = cluster->portals + i;
|
|
if (tp == portal) {
|
|
thread->selfcull++;
|
|
continue;
|
|
}
|
|
thread->spheretest++;
|
|
portal_side = test_sphere (&portal->sphere, tp->plane);
|
|
if (portal_side > 0) {
|
|
// The portal definitely is entirely in front of the test
|
|
// portal's plane. (cannot see into a portal from its
|
|
// front side)
|
|
thread->spherecull++;
|
|
} else if (portal_side < 0) {
|
|
// The portal's sphere is behind the test portal's plane,
|
|
// so the portal itself is entirely behind the plane
|
|
// thus the test portal is potentially visible.
|
|
thread->spherepass++;
|
|
set_add (thread->portalsee, tp - portals);
|
|
} else {
|
|
// The portal's sphere straddle's the test portal's
|
|
// plane, so need to do a more refined check.
|
|
thread->windingtest++;
|
|
if (test_winding_back (portal->winding, tp->plane)) {
|
|
// The portal is at least partially behind the test
|
|
// portal's plane, so the test portal is potentially
|
|
// visible.
|
|
thread->windingpass++;
|
|
set_add (thread->portalsee, tp - portals);
|
|
} else {
|
|
thread->windingcull++;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
thread->clustertest += cluster->numportals;
|
|
// The cluster's sphere straddle's the portal's plane, thus each
|
|
// portal in the cluster must be tested individually.
|
|
for (int i = 0; i < cluster->numportals; i++) {
|
|
tp = cluster->portals + i;
|
|
if (tp == portal) {
|
|
thread->selfcull++;
|
|
continue;
|
|
}
|
|
thread->spheretest++;
|
|
// If the target portal is behind the portals's plane, then
|
|
// it can't possibly be seen by the portal.
|
|
//
|
|
// If the portal is in front of the target's plane, then the
|
|
// target is of no interest as it is facing counter to the
|
|
// flow of visibility.
|
|
|
|
// First check using the bounding spheres of the two portals.
|
|
tp_side = test_sphere (&tp->sphere, portal->plane);
|
|
if (tp_side < 0) {
|
|
// The test portal definitely is entirely behind the
|
|
// portal's plane.
|
|
thread->spherecull++;
|
|
continue; // entirely behind
|
|
}
|
|
portal_side = test_sphere (&portal->sphere, tp->plane);
|
|
if (portal_side > 0) {
|
|
// The portal definitely is entirely in front of the
|
|
// test portal's plane. (cannot see into a portal from
|
|
// its front side)
|
|
thread->spherecull++;
|
|
continue; // entirely in front
|
|
}
|
|
if (tp_side > 0 && portal_side < 0) {
|
|
thread->spherepass++;
|
|
set_add (thread->portalsee, tp - portals);
|
|
continue;
|
|
}
|
|
|
|
thread->windingtest++;
|
|
if (tp_side == 0) {
|
|
// The test portal's sphere touches the portal's plane,
|
|
// so do a more refined check.
|
|
if (!test_winding_front (tp->winding, portal->plane)) {
|
|
thread->windingcull++;
|
|
continue;
|
|
}
|
|
}
|
|
if (portal_side == 0) {
|
|
// The portal's sphere touches the test portal's plane,
|
|
// so do a more refined check.
|
|
if (!test_winding_back (portal->winding, tp->plane)) {
|
|
thread->windingcull++;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
thread->windingpass++;
|
|
set_add (thread->portalsee, tp - portals);
|
|
}
|
|
}
|
|
}
|
|
|
|
SimpleFlood (thread, portal, portal->cluster);
|
|
portal->nummightsee = thread->clustersee;
|
|
}
|