mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-10 23:32:09 +00:00
453 lines
9.4 KiB
C
453 lines
9.4 KiB
C
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(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. See the
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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 the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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See file, 'COPYING', for details.
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*/
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static const char rcsid[] =
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"$Id$";
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#ifdef HAVE_CONFIG_H
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# include "config.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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#include "QF/sys.h"
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#include "bsp5.h"
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#include "options.h"
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typedef struct wvert_s {
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vec_t t;
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struct wvert_s *prev, *next;
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} wvert_t;
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typedef struct wedge_s {
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struct wedge_s *next;
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vec3_t dir;
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vec3_t origin;
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wvert_t head;
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} wedge_t;
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int numwedges, numwverts;
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int tjuncs;
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int tjuncfaces;
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#define MAXWVERTS 0x20000
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#define MAXWEDGES 0x10000
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wvert_t wverts[MAXWVERTS];
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wedge_t wedges[MAXWEDGES];
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#define NUM_HASH 1024
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wedge_t *wedge_hash[NUM_HASH];
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static vec3_t hash_min, hash_scale;
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static void
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InitHash (vec3_t mins, vec3_t maxs)
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{
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int newsize[2];
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vec3_t size;
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vec_t volume;
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vec_t scale;
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VectorCopy (mins, hash_min);
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VectorSubtract (maxs, mins, size);
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memset (wedge_hash, 0, sizeof (wedge_hash));
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volume = size[0] * size[1];
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scale = sqrt (volume / NUM_HASH);
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newsize[0] = size[0] / scale;
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newsize[1] = size[1] / scale;
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hash_scale[0] = newsize[0] / size[0];
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hash_scale[1] = newsize[1] / size[1];
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hash_scale[2] = newsize[1];
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}
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static unsigned
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HashVec (vec3_t vec)
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{
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unsigned h;
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h = hash_scale[0] * (vec[0] - hash_min[0]) * hash_scale[2]
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+ hash_scale[1] * (vec[1] - hash_min[1]);
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if (h >= NUM_HASH)
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return NUM_HASH - 1;
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return h;
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}
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static void
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CanonicalVector (vec3_t vec)
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{
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_VectorNormalize (vec);
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if (vec[0] > EQUAL_EPSILON)
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return;
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else if (vec[0] < -EQUAL_EPSILON) {
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VectorSubtract (vec3_origin, vec, vec);
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return;
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} else
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vec[0] = 0;
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if (vec[1] > EQUAL_EPSILON)
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return;
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else if (vec[1] < -EQUAL_EPSILON) {
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VectorSubtract (vec3_origin, vec, vec);
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return;
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} else
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vec[1] = 0;
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if (vec[2] > EQUAL_EPSILON)
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return;
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else if (vec[2] < -EQUAL_EPSILON) {
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VectorSubtract (vec3_origin, vec, vec);
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return;
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} else
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vec[2] = 0;
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Sys_Error ("CanonicalVector: degenerate");
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}
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static wedge_t *
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FindEdge (vec3_t p1, vec3_t p2, vec_t *t1, vec_t *t2)
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{
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int h;
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vec3_t dir, origin;
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vec_t temp;
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wedge_t *w;
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VectorSubtract (p2, p1, dir);
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CanonicalVector (dir);
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*t1 = DotProduct (p1, dir);
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*t2 = DotProduct (p2, dir);
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VectorMA (p1, -*t1, dir, origin);
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if (*t1 > *t2) {
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temp = *t1;
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*t1 = *t2;
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*t2 = temp;
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}
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h = HashVec (origin);
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for (w = wedge_hash[h]; w; w = w->next) {
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temp = w->origin[0] - origin[0];
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if (temp < -EQUAL_EPSILON || temp > EQUAL_EPSILON)
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continue;
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temp = w->origin[1] - origin[1];
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if (temp < -EQUAL_EPSILON || temp > EQUAL_EPSILON)
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continue;
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temp = w->origin[2] - origin[2];
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if (temp < -EQUAL_EPSILON || temp > EQUAL_EPSILON)
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continue;
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temp = w->dir[0] - dir[0];
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if (temp < -EQUAL_EPSILON || temp > EQUAL_EPSILON)
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continue;
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temp = w->dir[1] - dir[1];
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if (temp < -EQUAL_EPSILON || temp > EQUAL_EPSILON)
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continue;
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temp = w->dir[2] - dir[2];
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if (temp < -EQUAL_EPSILON || temp > EQUAL_EPSILON)
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continue;
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return w;
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}
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if (numwedges == MAXWEDGES)
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Sys_Error ("FindEdge: numwedges == MAXWEDGES");
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w = &wedges[numwedges];
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numwedges++;
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w->next = wedge_hash[h];
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wedge_hash[h] = w;
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VectorCopy (origin, w->origin);
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VectorCopy (dir, w->dir);
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w->head.next = w->head.prev = &w->head;
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w->head.t = 99999;
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return w;
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}
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#define T_EPSILON 0.01
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static void
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AddVert (wedge_t *w, vec_t t)
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{
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wvert_t *v, *newv;
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v = w->head.next;
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do {
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if (fabs (v->t - t) < T_EPSILON)
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return;
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if (v->t > t)
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break;
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v = v->next;
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} while (1);
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// insert a new wvert before v
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if (numwverts == MAXWVERTS)
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Sys_Error ("AddVert: numwverts == MAXWVERTS");
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newv = &wverts[numwverts];
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numwverts++;
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newv->t = t;
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newv->next = v;
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newv->prev = v->prev;
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v->prev->next = newv;
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v->prev = newv;
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}
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static void
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AddEdge (vec3_t p1, vec3_t p2)
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{
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wedge_t *w;
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vec_t t1, t2;
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w = FindEdge (p1, p2, &t1, &t2);
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AddVert (w, t1);
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AddVert (w, t2);
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}
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static void
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AddFaceEdges (face_t *f)
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{
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int i, j;
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for (i = 0; i < f->numpoints; i++) {
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j = (i + 1) % f->numpoints;
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AddEdge (f->pts[i], f->pts[j]);
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}
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}
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// a specially allocated face that can hold hundreds of edges if needed
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byte superfacebuf[8192];
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face_t *superface = (face_t *) superfacebuf;
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void FixFaceEdges (face_t * f);
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face_t *newlist;
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static void
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SplitFaceForTjunc (face_t *f, face_t *original)
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{
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face_t *new, *chain;
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int firstcorner, lastcorner, i;
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vec3_t dir, test;
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vec_t v;
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chain = NULL;
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do {
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if (f->numpoints <= MAXPOINTS) {
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// the face is now small enough without more cutting so copy it
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// back to the original
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*original = *f;
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original->original = chain;
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original->next = newlist;
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newlist = original;
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return;
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}
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tjuncfaces++;
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restart:
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// find the last corner
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VectorSubtract (f->pts[f->numpoints - 1], f->pts[0], dir);
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_VectorNormalize (dir);
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for (lastcorner = f->numpoints - 1; lastcorner > 0; lastcorner--) {
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VectorSubtract (f->pts[lastcorner - 1], f->pts[lastcorner], test);
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_VectorNormalize (test);
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v = DotProduct (test, dir);
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if (v < 0.9999 || v > 1.00001)
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break;
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}
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// find the first corner
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VectorSubtract (f->pts[1], f->pts[0], dir);
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_VectorNormalize (dir);
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for (firstcorner = 1; firstcorner < f->numpoints - 1; firstcorner++) {
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VectorSubtract (f->pts[firstcorner + 1], f->pts[firstcorner],
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test);
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_VectorNormalize (test);
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v = DotProduct (test, dir);
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if (v < 0.9999 || v > 1.00001)
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break;
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}
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if (firstcorner + 2 >= MAXPOINTS) {
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// rotate the point winding
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VectorCopy (f->pts[0], test);
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for (i = 1; i < f->numpoints; i++)
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VectorCopy (f->pts[i], f->pts[i - 1]);
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VectorCopy (test, f->pts[f->numpoints - 1]);
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goto restart;
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}
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// cut off as big a piece as possible, less than MAXPOINTS, and not
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// past lastcorner
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new = NewFaceFromFace (f);
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if (f->original)
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Sys_Error ("SplitFaceForTjunc: f->original");
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new->original = chain;
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chain = new;
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new->next = newlist;
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newlist = new;
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if (f->numpoints - firstcorner <= MAXPOINTS)
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new->numpoints = firstcorner + 2;
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else if (lastcorner + 2 < MAXPOINTS &&
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f->numpoints - lastcorner <= MAXPOINTS)
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new->numpoints = lastcorner + 2;
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else
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new->numpoints = MAXPOINTS;
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for (i = 0; i < new->numpoints; i++)
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VectorCopy (f->pts[i], new->pts[i]);
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for (i = new->numpoints - 1; i < f->numpoints; i++)
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VectorCopy (f->pts[i], f->pts[i - (new->numpoints - 2)]);
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f->numpoints -= (new->numpoints - 2);
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} while (1);
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}
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void
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FixFaceEdges (face_t *f)
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{
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int i, j, k;
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vec_t t1, t2;
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wedge_t *w;
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wvert_t *v;
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*superface = *f;
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restart:
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for (i = 0; i < superface->numpoints; i++) {
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j = (i + 1) % superface->numpoints;
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w = FindEdge (superface->pts[i], superface->pts[j], &t1, &t2);
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for (v = w->head.next; v->t < t1 + T_EPSILON; v = v->next) {
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}
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if (v->t < t2 - T_EPSILON) {
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tjuncs++;
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// insert a new vertex here
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for (k = superface->numpoints; k > j; k--) {
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VectorCopy (superface->pts[k - 1], superface->pts[k]);
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}
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VectorMA (w->origin, v->t, w->dir, superface->pts[j]);
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superface->numpoints++;
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goto restart;
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}
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}
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if (superface->numpoints <= MAXPOINTS) {
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*f = *superface;
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f->next = newlist;
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newlist = f;
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return;
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}
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// the face needs to be split into multiple faces because of too many edges
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SplitFaceForTjunc (superface, f);
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}
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//============================================================================
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static void
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tjunc_find_r (node_t *node)
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{
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face_t *f;
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if (node->planenum == PLANENUM_LEAF)
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return;
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for (f = node->faces; f; f = f->next)
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AddFaceEdges (f);
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tjunc_find_r (node->children[0]);
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tjunc_find_r (node->children[1]);
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}
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static void
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tjunc_fix_r (node_t *node)
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{
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face_t *next, *f;
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if (node->planenum == PLANENUM_LEAF)
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return;
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newlist = NULL;
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for (f = node->faces; f; f = next) {
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next = f->next;
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FixFaceEdges (f);
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}
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node->faces = newlist;
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tjunc_fix_r (node->children[0]);
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tjunc_fix_r (node->children[1]);
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}
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void
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tjunc (node_t *headnode)
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{
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int i;
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vec3_t maxs, mins;
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qprintf ("---- tjunc ----\n");
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if (options.notjunc)
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return;
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// identify all points on common edges
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// origin points won't allways be inside the map, so extend the hash area
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for (i = 0; i < 3; i++) {
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if (fabs (brushset->maxs[i]) > fabs (brushset->mins[i]))
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maxs[i] = fabs (brushset->maxs[i]);
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else
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maxs[i] = fabs (brushset->mins[i]);
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}
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VectorSubtract (vec3_origin, maxs, mins);
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InitHash (mins, maxs);
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numwedges = numwverts = 0;
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tjunc_find_r (headnode);
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qprintf ("%i world edges %i edge points\n", numwedges, numwverts);
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// add extra vertexes on edges where needed
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tjuncs = tjuncfaces = 0;
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tjunc_fix_r (headnode);
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qprintf ("%i edges added by tjunctions\n", tjuncs);
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qprintf ("%i faces added by tjunctions\n", tjuncfaces);
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}
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