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root/radiance/ray/src/util/glaresrc.c
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Comparing ray/src/util/glaresrc.c (file contents):
Revision 1.13 by greg, Fri Apr 19 17:41:03 1991 UTC vs.
Revision 2.7 by greg, Tue Nov 29 20:45:21 2022 UTC

# Line 1 | Line 1
1 – /* Copyright (c) 1991 Regents of the University of California */
2 –
1   #ifndef lint
2 < static char SCCSid[] = "$SunId$ LBL";
2 > static const char       RCSid[] = "$Id$";
3   #endif
6 –
4   /*
5   * Gather samples and compute glare sources.
6   */
7  
8   #include "glare.h"
9 + #include "linregr.h"
10  
11   #define vcont(vd,vu)    ((vu)-(vd)<=SEPS)
12   #define hcont(s1,s2)    ((s1)->r-(s2)->l>=-SEPS&&(s2)->r-(s1)->l>=-SEPS)
# Line 16 | Line 14 | static char SCCSid[] = "$SunId$ LBL";
14   struct source   *curlist = NULL;        /* current source list */
15   struct source   *donelist = NULL;       /* finished sources */
16  
17 + void    pict_stats(void);
18  
19 < struct srcspan *
20 < newspan(l, r, v, sb)            /* allocate a new source span */
21 < int     l, r, v;
22 < float   *sb;
19 > static struct srcspan * newspan(int     l, int  r, int  v, float        *sb);
20 > static void addindirect(int     h, int  v, double       br);
21 > static void addsrcspan(struct srcspan   *nss);
22 > static void mergesource(struct source   *sp, struct source      *ap);
23 > static void close_sources(int   v);
24 > static void close_allsrcs(void);
25 > static struct srcspan * splitspan(struct srcspan        *sso, double    h, double       v, double       m);
26 > static struct source * splitsource(struct source        *so);
27 > static void donesource(struct source    *sp);
28 > static struct source * findbuddy(struct source  *s, struct source       *l);
29 > static void absorb(struct source        *s);
30 > static void freespans(struct source     *sp);
31 >
32 >
33 > static struct srcspan *
34 > newspan(                /* allocate a new source span */
35 >        int     l,
36 >        int     r,
37 >        int     v,
38 >        float   *sb
39 > )
40   {
41 <        register struct srcspan *ss;
42 <        register int    i;
41 >        struct srcspan  *ss;
42 >        int     i;
43  
44          ss = (struct srcspan *)malloc(sizeof(struct srcspan));
45          if (ss == NULL)
# Line 38 | Line 54 | float  *sb;
54   }
55  
56  
57 < analyze()                       /* analyze our scene */
57 > void
58 > analyze(void)                   /* analyze our scene */
59   {
60          int     h, v;
61          int     left;
# Line 50 | Line 67 | analyze()                      /* analyze our scene */
67          for (v = vsize; v >= -vsize; v--) {
68                  close_sources(v);
69   #ifndef DEBUG
70 <                if (verbose)
70 >                if (verbose) {
71                          fprintf(stderr, "%s: analyzing... %3ld%%\r",
72                                  progname, 100L*(vsize-v)/(2*vsize));
73 +                        fflush(stderr);
74 +                }
75   #endif
76                  getviewspan(v, spanbr);
77                  left = hsize + 1;
# Line 78 | Line 97 | analyze()                      /* analyze our scene */
97                  if (left < h)
98                          addsrcspan(newspan(left,h,v,spanbr));
99          }
100 <        free((char *)spanbr);
100 >        free((void *)spanbr);
101          close_allsrcs();
102   }
103  
104  
105 < addindirect(h, v, br)           /* add brightness to indirect illuminances */
106 < int     h, v;
107 < double  br;
105 > static void
106 > addindirect(            /* add brightness to indirect illuminances */
107 >        int     h,
108 >        int     v,
109 >        double  br
110 > )
111   {
112          double  tanb, d;
113          int     hl;
114 <        register int    i;
114 >        int     i;
115  
116          hl = hlim(v);
117          if (h <= -hl) {                 /* left region */
# Line 131 | Line 153 | double br;
153   }
154  
155  
156 < comp_thresh()                   /* compute glare threshold */
156 > void
157 > comp_thresh(void)                       /* compute glare threshold */
158   {
159          int     h, v;
160          int     nsamps;
# Line 170 | Line 193 | comp_thresh()                  /* compute glare threshold */
193   }
194  
195  
196 < addsrcspan(nss)                 /* add new source span to our list */
197 < struct srcspan  *nss;
196 > static void
197 > addsrcspan(                     /* add new source span to our list */
198 >        struct srcspan  *nss
199 > )
200   {
201          struct source   *last, *cs, *this;
202 <        register struct srcspan *ss;
202 >        struct srcspan  *ss;
203  
204          cs = NULL;
205          for (this = curlist; this != NULL; this = this->next) {
# Line 208 | Line 233 | struct srcspan *nss;
233   }
234  
235  
236 < mergesource(sp, ap)             /* merge source ap into source sp */
237 < struct source   *sp, *ap;
236 > static void
237 > mergesource(            /* merge source ap into source sp */
238 >        struct source   *sp,
239 >        struct source   *ap
240 > )
241   {
242          struct srcspan  head;
243 <        register struct srcspan *alp, *prev, *tp;
243 >        struct srcspan  *alp, *prev, *tp;
244  
245          head.next = sp->first;
246          prev = &head;
# Line 238 | Line 266 | struct source  *sp, *ap;
266                  sp->brt = (sp->brt*sp->dom + ap->brt*ap->dom)
267                                  / (sp->dom + ap->dom);
268          }
269 <        free((char *)ap);
269 >        free((void *)ap);
270   }
271  
272  
273 < close_sources(v)                /* close sources above v */
274 < int     v;
273 > static void
274 > close_sources(          /* close sources above v */
275 >        int     v
276 > )
277   {
278          struct source   head;
279 <        register struct source  *last, *this;
279 >        struct source   *last, *this;
280  
281          head.next = curlist;
282          last = &head;
# Line 261 | Line 291 | int    v;
291   }
292  
293  
294 < close_allsrcs()                 /* done with everything */
294 > static void
295 > close_allsrcs(void)                     /* done with everything */
296   {
297 <        register struct source  *this, *next;
297 >        struct source   *this, *next;
298  
299          this = curlist;
300          while (this != NULL) {
# Line 275 | Line 306 | close_allsrcs()                        /* done with everything */
306   }
307  
308  
309 < donesource(sp)                  /* finished with this source */
310 < register struct source  *sp;
309 > static struct srcspan *
310 > splitspan(              /* divide source span at point */
311 >        struct srcspan  *sso,
312 >        double  h,
313 >        double  v,
314 >        double  m
315 > )
316   {
317 <        FVECT   dthis, dright;
318 <        register struct srcspan *ss;
317 >        struct srcspan  *ssn;
318 >        double  d;
319 >        int     hs;
320 >
321 >        d = h - m*(sso->v - v);
322 >        hs = d < 0. ? d-.5 : d+.5;
323 >        if (sso->l >= hs)
324 >                return(NULL);
325 >        if (sso->r <= hs)
326 >                return(sso);
327 >                                /* need to split it */
328 >        ssn = (struct srcspan *)malloc(sizeof(struct srcspan));
329 >        if (ssn == NULL)
330 >                memerr("source spans in splitspan");
331 >        ssn->brsum = (double)(hs - sso->l)/(sso->r - sso->l) * sso->brsum;
332 >        sso->brsum -= ssn->brsum;
333 >        ssn->v = sso->v;
334 >        ssn->l = sso->l;
335 >        ssn->r = sso->l = hs;
336 >        return(ssn);
337 > }
338 >
339 >
340 > static struct source *
341 > splitsource(                    /* divide source in two if it's big and long */
342 >        struct source   *so
343 > )
344 > {
345 >        LRSUM   lr;
346 >        LRLIN   fit;
347 >        struct srcspan  *ss, *ssn;
348 >        struct srcspan  *ssl, *ssnl, head;
349 >        int     h;
350 >        double  mh, mv;
351 >        struct source   *sn;
352 >
353 >        lrclear(&lr);
354 >        for (ss = so->first; ss != NULL; ss = ss->next)
355 >                for (h = ss->l; h < ss->r; h++)
356 >                        lrpoint(h, ss->v, &lr);
357 >        if ((double)lr.n/(sampdens*sampdens) < SABIG)
358 >                return(NULL);                   /* too small */
359 >        if (lrfit(&fit, &lr) < 0)
360 >                return(NULL);                   /* can't fit a line */
361 >        if (fit.correlation < LCORR && fit.correlation > -LCORR)
362 >                return(NULL);
363 >        if (verbose)
364 >                fprintf(stderr, "%s: splitting large source\n", progname);
365 >        mh = lrxavg(&lr);
366 >        mv = lryavg(&lr);
367 >        sn = (struct source *)malloc(sizeof(struct source));
368 >        if (sn == NULL)
369 >                memerr("source records in splitsource");
370 >        sn->dom = 0.0;
371 >        sn->first = NULL;
372 >        ssnl = NULL;
373 >        head.next = so->first;
374 >        ssl = &head;
375 >        for (ss = so->first; ss != NULL; ssl = ss, ss = ss->next)
376 >                if ((ssn = splitspan(ss, mh, mv, fit.slope)) != NULL) {
377 >                        if (ssn == ss) {        /* remove from old */
378 >                                ssl->next = ss->next;
379 >                                ss = ssl;
380 >                        }
381 >                        if (ssnl == NULL)       /* add to new */
382 >                                sn->first = ssn;
383 >                        else
384 >                                ssnl->next = ssn;
385 >                        ssn->next = NULL;
386 >                        ssnl = ssn;
387 >                }
388 >        so->first = head.next;
389 >        return(sn);
390 > }
391 >
392 >
393 > static void
394 > donesource(                     /* finished with this source */
395 >        struct source   *sp
396 > )
397 > {
398 >        struct source   *newsrc;
399 >        struct srcspan  *ss;
400          int     h, n;
401          double  hsum, vsum, d;
402  
403 +        while ((newsrc = splitsource(sp)) != NULL)      /* split it? */
404 +                donesource(newsrc);
405          sp->dom = 0.0;
406          hsum = vsum = 0.0;
407          sp->brt = 0.0;
# Line 290 | Line 409 | register struct source *sp;
409          for (ss = sp->first; ss != NULL; ss = ss->next) {
410                  sp->brt += ss->brsum;
411                  n += ss->r - ss->l;
412 <                for (h = ss->r-1; h >= ss->l; h--) {
412 >                for (h = ss->l; h < ss->r; h++) {
413                          d = pixsize(h, ss->v);
414                          hsum += d*h;
415                          vsum += d*ss->v;
416                          sp->dom += d;
417                  }
299 –                free((char *)ss);
418          }
419 <        sp->first = NULL;
419 >        freespans(sp);
420 >        if (sp->dom <= FTINY) {         /* must be right at edge of image */
421 >                free((void *)sp);
422 >                return;
423 >        }
424          sp->brt /= (double)n;
425          compdir(sp->dir, (int)(hsum/sp->dom), (int)(vsum/sp->dom));
426          sp->next = donelist;
# Line 311 | Line 433 | register struct source *sp;
433   }
434  
435  
436 < struct source *
437 < findbuddy(s, l)                 /* find close enough source to s in l*/
438 < register struct source  *s, *l;
436 > static struct source *
437 > findbuddy(                      /* find close enough source to s in l*/
438 >        struct source   *s,
439 >        struct source   *l
440 > )
441   {
442          struct source   *bestbuddy = NULL;
443          double  d, r, mindist = MAXBUDDY;
# Line 330 | Line 454 | register struct source *s, *l;
454   }
455  
456  
457 < absorb_specks()                 /* eliminate too-small sources */
457 > void
458 > absorb_specks(void)                     /* eliminate too-small sources */
459   {
460          struct source   head, *buddy;
461 <        register struct source  *last, *this;
461 >        struct source   *last, *this;
462  
463          if (verbose)
464                  fprintf(stderr, "%s: absorbing small sources...\n", progname);
# Line 354 | Line 479 | absorb_specks()                        /* eliminate too-small sources */
479   }
480  
481  
482 < absorb(s)                       /* absorb a source into indirect */
483 < register struct source  *s;
482 > static void
483 > absorb(                 /* absorb a source into indirect */
484 >        struct source   *s
485 > )
486   {
487          FVECT   dir;
488          double  d;
489 <        register int    i;
489 >        int     i;
490  
491          for (i = 0; i < nglardirs; i++) {
492                  spinvector(dir, ourview.vdir, ourview.vup, indirect[i].theta);
# Line 369 | Line 496 | register struct source *s;
496                  indirect[i].sum += d * s->brt;
497                  indirect[i].n += d;
498          }
499 <        for ( ; s->first != NULL; s->first = s->first->next)
500 <                free((char *)s->first);
501 <        free((char *)s);
499 >        freespans(s);
500 >        free((void *)s);
501 > }
502 >
503 >
504 > static void
505 > freespans(                      /* free spans associated with source */
506 >        struct source   *sp
507 > )
508 > {
509 >        struct srcspan  *ss;
510 >
511 >        while ((ss = sp->first) != NULL) {
512 >                sp->first = ss->next;
513 >                free((void *)ss);
514 >        }
515   }

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