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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 1.15 by greg, Tue Apr 30 16:39:39 1991 UTC

# Line 9 | Line 9 | static char SCCSid[] = "$SunId$ LBL";
9   */
10  
11   #include "glare.h"
12 + #include "linregr.h"
13  
14   #define vcont(vd,vu)    ((vu)-(vd)<=SEPS)
15   #define hcont(s1,s2)    ((s1)->r-(s2)->l>=-SEPS&&(s2)->r-(s1)->l>=-SEPS)
# Line 275 | Line 276 | close_allsrcs()                        /* done with everything */
276   }
277  
278  
279 + struct srcspan *
280 + splitspan(sso, h, v, m)         /* divide source span at point */
281 + register struct srcspan *sso;
282 + double  h, v, m;
283 + {
284 +        register struct srcspan *ssn;
285 +        double  d;
286 +        int     hs;
287 +
288 +        d = h - m*(sso->v - v);
289 +        hs = d < 0. ? d-.5 : d+.5;
290 +        if (sso->l >= hs)
291 +                return(NULL);
292 +        if (sso->r <= hs)
293 +                return(sso);
294 +                                /* need to split it */
295 +        ssn = (struct srcspan *)malloc(sizeof(struct srcspan));
296 +        if (ssn == NULL)
297 +                memerr("source spans in splitspan");
298 +        ssn->brsum = (double)(hs - sso->l)/(sso->r - sso->l) * sso->brsum;
299 +        sso->brsum -= ssn->brsum;
300 +        ssn->v = sso->v;
301 +        ssn->l = sso->l;
302 +        ssn->r = sso->l = hs;
303 +        return(ssn);
304 + }
305 +
306 +
307 + struct source *
308 + splitsource(so)                 /* divide source in two if it's big and long */
309 + struct source   *so;
310 + {
311 +        LRSUM   lr;
312 +        LRLIN   fit;
313 +        register struct srcspan *ss, *ssn;
314 +        struct srcspan  *ssl, *ssnl, head;
315 +        int     h;
316 +        double  mh, mv;
317 +        struct source   *sn;
318 +
319 +        lrclear(&lr);
320 +        for (ss = so->first; ss != NULL; ss = ss->next)
321 +                for (h = ss->l; h < ss->r; h++)
322 +                        lrpoint(h, ss->v, &lr);
323 +        if ((double)lr.n/(sampdens*sampdens) < SABIG)
324 +                return(NULL);                   /* too small */
325 +        if (lrfit(&fit, &lr) < 0)
326 +                return(NULL);                   /* can't fit a line */
327 +        if (fit.correlation < LCORR && fit.correlation > -LCORR)
328 +                return(NULL);
329 +        if (verbose)
330 +                fprintf(stderr, "%s: splitting large source\n", progname);
331 +        mh = lrxavg(&lr);
332 +        mv = lryavg(&lr);
333 +        sn = (struct source *)malloc(sizeof(struct source));
334 +        if (sn == NULL)
335 +                memerr("source records in splitsource");
336 +        sn->dom = 0.0;
337 +        sn->first = NULL;
338 +        ssnl = NULL;
339 +        head.next = so->first;
340 +        ssl = &head;
341 +        for (ss = so->first; ss != NULL; ssl = ss, ss = ss->next)
342 +                if ((ssn = splitspan(ss, mh, mv, fit.slope)) != NULL) {
343 +                        if (ssn == ss) {        /* remove from old */
344 +                                ssl->next = ss->next;
345 +                                ss = ssl;
346 +                        }
347 +                        if (ssnl == NULL)       /* add to new */
348 +                                sn->first = ssn;
349 +                        else
350 +                                ssnl->next = ssn;
351 +                        ssn->next = NULL;
352 +                        ssnl = ssn;
353 +                }
354 +        so->first = head.next;
355 +        return(sn);
356 + }
357 +
358 +
359   donesource(sp)                  /* finished with this source */
360   register struct source  *sp;
361   {
362 +        struct source   *newsrc;
363          register struct srcspan *ss;
364          int     h, n;
365          double  hsum, vsum, d;
366  
367 +        while ((newsrc = splitsource(sp)) != NULL)      /* split it? */
368 +                donesource(newsrc);
369          sp->dom = 0.0;
370          hsum = vsum = 0.0;
371          sp->brt = 0.0;
# Line 295 | Line 379 | register struct source *sp;
379                          vsum += d*ss->v;
380                          sp->dom += d;
381                  }
298                free((char *)ss);
382          }
300        sp->first = NULL;
383          sp->brt /= (double)n;
384          compdir(sp->dir, (int)(hsum/sp->dom), (int)(vsum/sp->dom));
385 +        freespans(sp);
386          sp->next = donelist;
387          donelist = sp;
388          if (verbose)
# Line 368 | Line 451 | register struct source *s;
451                  indirect[i].sum += d * s->brt;
452                  indirect[i].n += d;
453          }
454 <        for ( ; s->first != NULL; s->first = s->first->next)
372 <                free((char *)s->first);
454 >        freespans(s);
455          free((char *)s);
456 + }
457 +
458 +
459 + freespans(sp)                   /* free spans associated with source */
460 + struct source   *sp;
461 + {
462 +        register struct srcspan *ss;
463 +
464 +        for (ss = sp->first; ss != NULL; ss = ss->next)
465 +                free((char *)ss);
466 +        sp->first = NULL;
467   }

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