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root/radiance/ray/src/util/glaresrc.c
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Comparing ray/src/util/glaresrc.c (file contents):
Revision 1.14 by greg, Mon Apr 22 08:20:58 1991 UTC vs.
Revision 2.6 by greg, Mon May 29 16:47:54 2006 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 struct srcspan * newspan(int     l, int  r, int  v, float        *sb);
21 > static void addindirect(int     h, int  v, double       br);
22 > static void addsrcspan(struct srcspan   *nss);
23 > static void mergesource(struct source   *sp, struct source      *ap);
24 > static void close_sources(int   v);
25 > static void close_allsrcs(void);
26 > static struct srcspan * splitspan(register struct srcspan       *sso, double    h, double       v, double       m);
27 > static struct source * splitsource(struct source        *so);
28 > static void donesource(register struct source   *sp);
29 > static struct source * findbuddy(register struct source *s, register struct source      *l);
30 > static void absorb(register struct source       *s);
31 > static void freespans(struct source     *sp);
32 >
33 >
34 > static struct srcspan *
35 > newspan(                /* allocate a new source span */
36 >        int     l,
37 >        int     r,
38 >        int     v,
39 >        float   *sb
40 > )
41   {
42          register struct srcspan *ss;
43          register int    i;
# Line 38 | Line 55 | float  *sb;
55   }
56  
57  
58 < analyze()                       /* analyze our scene */
58 > extern void
59 > analyze(void)                   /* analyze our scene */
60   {
61          int     h, v;
62          int     left;
# Line 50 | Line 68 | analyze()                      /* analyze our scene */
68          for (v = vsize; v >= -vsize; v--) {
69                  close_sources(v);
70   #ifndef DEBUG
71 <                if (verbose)
71 >                if (verbose) {
72                          fprintf(stderr, "%s: analyzing... %3ld%%\r",
73                                  progname, 100L*(vsize-v)/(2*vsize));
74 +                        fflush(stderr);
75 +                }
76   #endif
77                  getviewspan(v, spanbr);
78                  left = hsize + 1;
# Line 78 | Line 98 | analyze()                      /* analyze our scene */
98                  if (left < h)
99                          addsrcspan(newspan(left,h,v,spanbr));
100          }
101 <        free((char *)spanbr);
101 >        free((void *)spanbr);
102          close_allsrcs();
103   }
104  
105  
106 < addindirect(h, v, br)           /* add brightness to indirect illuminances */
107 < int     h, v;
108 < double  br;
106 > static void
107 > addindirect(            /* add brightness to indirect illuminances */
108 >        int     h,
109 >        int     v,
110 >        double  br
111 > )
112   {
113          double  tanb, d;
114          int     hl;
# Line 131 | Line 154 | double br;
154   }
155  
156  
157 < comp_thresh()                   /* compute glare threshold */
157 > extern void
158 > comp_thresh(void)                       /* compute glare threshold */
159   {
160          int     h, v;
161          int     nsamps;
# Line 170 | Line 194 | comp_thresh()                  /* compute glare threshold */
194   }
195  
196  
197 < addsrcspan(nss)                 /* add new source span to our list */
198 < struct srcspan  *nss;
197 > static void
198 > addsrcspan(                     /* add new source span to our list */
199 >        struct srcspan  *nss
200 > )
201   {
202          struct source   *last, *cs, *this;
203          register struct srcspan *ss;
# Line 208 | Line 234 | struct srcspan *nss;
234   }
235  
236  
237 < mergesource(sp, ap)             /* merge source ap into source sp */
238 < struct source   *sp, *ap;
237 > static void
238 > mergesource(            /* merge source ap into source sp */
239 >        struct source   *sp,
240 >        struct source   *ap
241 > )
242   {
243          struct srcspan  head;
244          register struct srcspan *alp, *prev, *tp;
# Line 238 | Line 267 | struct source  *sp, *ap;
267                  sp->brt = (sp->brt*sp->dom + ap->brt*ap->dom)
268                                  / (sp->dom + ap->dom);
269          }
270 <        free((char *)ap);
270 >        free((void *)ap);
271   }
272  
273  
274 < close_sources(v)                /* close sources above v */
275 < int     v;
274 > static void
275 > close_sources(          /* close sources above v */
276 >        int     v
277 > )
278   {
279          struct source   head;
280          register struct source  *last, *this;
# Line 261 | Line 292 | int    v;
292   }
293  
294  
295 < close_allsrcs()                 /* done with everything */
295 > static void
296 > close_allsrcs(void)                     /* done with everything */
297   {
298          register struct source  *this, *next;
299  
# Line 275 | Line 307 | close_allsrcs()                        /* done with everything */
307   }
308  
309  
310 < donesource(sp)                  /* finished with this source */
311 < register struct source  *sp;
310 > static struct srcspan *
311 > splitspan(              /* divide source span at point */
312 >        register struct srcspan *sso,
313 >        double  h,
314 >        double  v,
315 >        double  m
316 > )
317   {
318 +        register struct srcspan *ssn;
319 +        double  d;
320 +        int     hs;
321 +
322 +        d = h - m*(sso->v - v);
323 +        hs = d < 0. ? d-.5 : d+.5;
324 +        if (sso->l >= hs)
325 +                return(NULL);
326 +        if (sso->r <= hs)
327 +                return(sso);
328 +                                /* need to split it */
329 +        ssn = (struct srcspan *)malloc(sizeof(struct srcspan));
330 +        if (ssn == NULL)
331 +                memerr("source spans in splitspan");
332 +        ssn->brsum = (double)(hs - sso->l)/(sso->r - sso->l) * sso->brsum;
333 +        sso->brsum -= ssn->brsum;
334 +        ssn->v = sso->v;
335 +        ssn->l = sso->l;
336 +        ssn->r = sso->l = hs;
337 +        return(ssn);
338 + }
339 +
340 +
341 + static struct source *
342 + splitsource(                    /* divide source in two if it's big and long */
343 +        struct source   *so
344 + )
345 + {
346 +        LRSUM   lr;
347 +        LRLIN   fit;
348 +        register struct srcspan *ss, *ssn;
349 +        struct srcspan  *ssl, *ssnl, head;
350 +        int     h;
351 +        double  mh, mv;
352 +        struct source   *sn;
353 +
354 +        lrclear(&lr);
355 +        for (ss = so->first; ss != NULL; ss = ss->next)
356 +                for (h = ss->l; h < ss->r; h++)
357 +                        lrpoint(h, ss->v, &lr);
358 +        if ((double)lr.n/(sampdens*sampdens) < SABIG)
359 +                return(NULL);                   /* too small */
360 +        if (lrfit(&fit, &lr) < 0)
361 +                return(NULL);                   /* can't fit a line */
362 +        if (fit.correlation < LCORR && fit.correlation > -LCORR)
363 +                return(NULL);
364 +        if (verbose)
365 +                fprintf(stderr, "%s: splitting large source\n", progname);
366 +        mh = lrxavg(&lr);
367 +        mv = lryavg(&lr);
368 +        sn = (struct source *)malloc(sizeof(struct source));
369 +        if (sn == NULL)
370 +                memerr("source records in splitsource");
371 +        sn->dom = 0.0;
372 +        sn->first = NULL;
373 +        ssnl = NULL;
374 +        head.next = so->first;
375 +        ssl = &head;
376 +        for (ss = so->first; ss != NULL; ssl = ss, ss = ss->next)
377 +                if ((ssn = splitspan(ss, mh, mv, fit.slope)) != NULL) {
378 +                        if (ssn == ss) {        /* remove from old */
379 +                                ssl->next = ss->next;
380 +                                ss = ssl;
381 +                        }
382 +                        if (ssnl == NULL)       /* add to new */
383 +                                sn->first = ssn;
384 +                        else
385 +                                ssnl->next = ssn;
386 +                        ssn->next = NULL;
387 +                        ssnl = ssn;
388 +                }
389 +        so->first = head.next;
390 +        return(sn);
391 + }
392 +
393 +
394 + static void
395 + donesource(                     /* finished with this source */
396 +        register struct source  *sp
397 + )
398 + {
399 +        struct source   *newsrc;
400          register struct srcspan *ss;
401          int     h, n;
402          double  hsum, vsum, d;
403  
404 +        while ((newsrc = splitsource(sp)) != NULL)      /* split it? */
405 +                donesource(newsrc);
406          sp->dom = 0.0;
407          hsum = vsum = 0.0;
408          sp->brt = 0.0;
# Line 295 | Line 416 | register struct source *sp;
416                          vsum += d*ss->v;
417                          sp->dom += d;
418                  }
298 –                free((char *)ss);
419          }
420 <        sp->first = NULL;
420 >        freespans(sp);
421 >        if (sp->dom <= FTINY) {         /* must be right at edge of image */
422 >                free((void *)sp);
423 >                return;
424 >        }
425          sp->brt /= (double)n;
426          compdir(sp->dir, (int)(hsum/sp->dom), (int)(vsum/sp->dom));
427          sp->next = donelist;
# Line 310 | Line 434 | register struct source *sp;
434   }
435  
436  
437 < struct source *
438 < findbuddy(s, l)                 /* find close enough source to s in l*/
439 < register struct source  *s, *l;
437 > static struct source *
438 > findbuddy(                      /* find close enough source to s in l*/
439 >        register struct source  *s,
440 >        register struct source  *l
441 > )
442   {
443          struct source   *bestbuddy = NULL;
444          double  d, r, mindist = MAXBUDDY;
# Line 329 | Line 455 | register struct source *s, *l;
455   }
456  
457  
458 < absorb_specks()                 /* eliminate too-small sources */
458 > extern void
459 > absorb_specks(void)                     /* eliminate too-small sources */
460   {
461          struct source   head, *buddy;
462          register struct source  *last, *this;
# Line 353 | Line 480 | absorb_specks()                        /* eliminate too-small sources */
480   }
481  
482  
483 < absorb(s)                       /* absorb a source into indirect */
484 < register struct source  *s;
483 > static void
484 > absorb(                 /* absorb a source into indirect */
485 >        register struct source  *s
486 > )
487   {
488          FVECT   dir;
489          double  d;
# Line 368 | Line 497 | register struct source *s;
497                  indirect[i].sum += d * s->brt;
498                  indirect[i].n += d;
499          }
500 <        for ( ; s->first != NULL; s->first = s->first->next)
501 <                free((char *)s->first);
502 <        free((char *)s);
500 >        freespans(s);
501 >        free((void *)s);
502 > }
503 >
504 >
505 > static void
506 > freespans(                      /* free spans associated with source */
507 >        struct source   *sp
508 > )
509 > {
510 >        register struct srcspan *ss;
511 >
512 >        while ((ss = sp->first) != NULL) {
513 >                sp->first = ss->next;
514 >                free((void *)ss);
515 >        }
516   }

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