[ViewVC] Diff of: radiance/ray/src/rt/ambient.c

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.59 by greg, Wed May 25 18:06:22 2005 UTC vs.
Revision 2.102 by greg, Sun Apr 24 16:21:32 2016 UTC

#	Line 1 \| Line 1
1	–	#ifndef lint
1		static const char RCSid[] = "$Id$";
3	–	#endif
2		/*
3		* ambient.c - routines dealing with ambient (inter-reflected) component.
4		*
#	Line 17 \| Line 15 \| static const char RCSid[] = "$Id$";
15		#include "resolu.h"
16		#include "ambient.h"
17		#include "random.h"
18	+	#include "pmapamb.h"
19
20		#ifndef OCTSCALE
21		#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */
#	Line 25 \| Line 24 \| static const char RCSid[] = "$Id$";
24		extern char shm_boundary; / memory sharing boundary */
25
26		#ifndef MAXASET
27	<	#define MAXASET 2047 /* maximum number of elements in ambient set */
27	>	#define MAXASET 4095 /* maximum number of elements in ambient set */
28		#endif
29		OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */
30
#	Line 39 \| Line 38 \| *static int nunflshed = 0; / number of unflushed ambi**
38
39		#ifndef SORT_THRESH
40		#ifdef SMLMEM
41	<	#define SORT_THRESH ((3L<<20)/sizeof(AMBVAL))
41	>	#define SORT_THRESH ((16L<<20)/sizeof(AMBVAL))
42		#else
43	<	#define SORT_THRESH ((9L<<20)/sizeof(AMBVAL))
43	>	#define SORT_THRESH ((64L<<20)/sizeof(AMBVAL))
44		#endif
45		#endif
46		#ifndef SORT_INTVL
#	Line 51 \| Line 50 \| *static int nunflshed = 0; / number of unflushed ambi**
50		#define MAX_SORT_INTVL (SORT_INTVL<<6)
51		#endif
52
53	+
54		static double avsum = 0.; /* computed ambient value sum (log) */
55		static unsigned int navsum = 0; /* number of values in avsum */
56		static unsigned int nambvals = 0; /* total number of indirect values */
#	Line 76 \| Line 76 \| *static long lastpos = -1; / last flush position /*
76		#define AMBFLUSH (BUFSIZ/AMBVALSIZ)
77
78		#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL))
79	–	#define freeav(av) free((void *)av);
79
80		static void initambfile(int creat);
81		static void avsave(AMBVAL *av);
#	Line 84 \| Line 83 \| *static AMBVAL avstore(AMBVAL aval);*
83		static AMBTREE *newambtree(void);
84		static void freeambtree(AMBTREE *atp);
85
86	<	typedef void unloadtf_t(void *);
86	>	typedef void unloadtf_t(AMBVAL *);
87		static unloadtf_t avinsert;
88		static unloadtf_t av2list;
89	+	static unloadtf_t avfree;
90		static void unloadatree(AMBTREE at, unloadtf_t f);
91
92		static int aposcmp(const void avp1, const void avp2);
#	Line 98 \| Line 98 \| static void aflock(int typ);
98		#endif
99
100
101	<	extern void
101	>	void
102		setambres( /* set ambient resolution */
103		int ar
104		)
#	Line 107 \| Line 107 \| *setambres( / set ambient resolution /*
107		/* set min & max radii */
108		if (ar <= 0) {
109		minarad = 0;
110	<	maxarad = thescene.cusize / 2.0;
110	>	maxarad = thescene.cusize*0.2;
111		} else {
112		minarad = thescene.cusize / ar;
113	<	maxarad = 64 * minarad; /* heuristic */
114	<	if (maxarad > thescene.cusize / 2.0)
115	<	maxarad = thescene.cusize / 2.0;
113	>	maxarad = 64.0 * minarad; /* heuristic */
114	>	if (maxarad > thescene.cusize*0.2)
115	>	maxarad = thescene.cusize*0.2;
116		}
117		if (minarad <= FTINY)
118	<	minarad = 10*FTINY;
118	>	minarad = 10.0*FTINY;
119		if (maxarad <= minarad)
120	<	maxarad = 64 * minarad;
120	>	maxarad = 64.0 * minarad;
121		}
122
123
124	<	extern void
124	>	void
125		setambacc( /* set ambient accuracy */
126		double newa
127		)
128		{
129	<	double ambdiff;
130	<
131	<	if (newa < 0.0)
132	<	newa = 0.0;
133	<	ambdiff = fabs(newa - ambacc);
134	<	if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0)
135	<	sortambvals(1); /* rebuild tree */
129	>	static double olda; /* remember previous setting here */
130	>
131	>	newa *= (newa > 0);
132	>	if (fabs(newa - olda) >= .05*(newa + olda)) {
133	>	ambacc = newa;
134	>	if (nambvals > 0)
135	>	sortambvals(1); /* rebuild tree */
136	>	}
137		}
138
139
140	<	extern void
140	>	void
141		setambient(void) /* initialize calculation */
142		{
143		int readonly = 0;
144	<	long pos, flen;
144	>	long flen;
145		AMBVAL amb;
146		/* make sure we're fresh */
147		ambdone();
#	Line 160 \| Line 161 \| *setambient(void) / initialize calculation /*
161		readonly = (ambfp = fopen(ambfile, "r")) != NULL;
162		if (ambfp != NULL) {
163		initambfile(0); /* file exists */
164	<	pos = ftell(ambfp);
164	>	lastpos = ftell(ambfp);
165		while (readambval(&amb, ambfp))
166	<	avinsert(avstore(&amb));
166	>	avstore(&amb);
167		nambshare = nambvals; /* share loaded values */
168		if (readonly) {
169		sprintf(errmsg,
#	Line 174 \| Line 175 \| *setambient(void) / initialize calculation /*
175		return; /* avoid ambsync() */
176		}
177		/* align file pointer */
178	<	pos += (long)nambvals*AMBVALSIZ;
178	>	lastpos += (long)nambvals*AMBVALSIZ;
179		flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
180	<	if (flen != pos) {
180	>	if (flen != lastpos) {
181		sprintf(errmsg,
182		"ignoring last %ld values in ambient file (corrupted)",
183	<	(flen - pos)/AMBVALSIZ);
183	>	(flen - lastpos)/AMBVALSIZ);
184		error(WARNING, errmsg);
185	<	fseek(ambfp, pos, 0);
186	<	#ifndef _WIN32 /* XXX we need a replacement for that one */
186	<	ftruncate(fileno(ambfp), (off_t)pos);
187	<	#endif
185	>	fseek(ambfp, lastpos, SEEK_SET);
186	>	ftruncate(fileno(ambfp), (off_t)lastpos);
187		}
188		} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
189		initambfile(1); /* else create new file */
190	+	fflush(ambfp);
191	+	lastpos = ftell(ambfp);
192		} else {
193		sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
194		error(SYSTEM, errmsg);
195		}
196	<	nunflshed++; /* lie */
197	<	ambsync();
196	>	#ifdef F_SETLKW
197	>	aflock(F_UNLCK); /* release file */
198	>	#endif
199		}
200
201
202	<	extern void
202	>	void
203		ambdone(void) /* close ambient file and free memory */
204		{
205		if (ambfp != NULL) { /* close ambient file */
#	Line 211 \| Line 213 \| *ambdone(void) / close ambient file and free memory**
213		lastpos = -1;
214		}
215		/* free ambient tree */
216	<	unloadatree(&atrunk, free);
216	>	unloadatree(&atrunk, avfree);
217		/* reset state variables */
218		avsum = 0.;
219		navsum = 0;
#	Line 223 \| Line 225 \| *ambdone(void) / close ambient file and free memory**
225		}
226
227
228	<	extern void
228	>	void
229		ambnotify( /* record new modifier */
230		OBJECT obj
231		)
232		{
233		static int hitlimit = 0;
234	<	register OBJREC *o;
235	<	register char **amblp;
234	>	OBJREC *o;
235	>	char **amblp;
236
237		if (obj == OVOID) { /* starting over */
238		ambset[0] = 0;
#	Line 252 \| Line 254 \| *ambnotify( / record new modifier /*
254		}
255		}
256
257	+	/********** THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD *************/
258
259	<	extern void
259	>	#ifndef OLDAMB
260	>
261	>	#define tfunc(lwr, x, upr) (((x)-(lwr))/((upr)-(lwr)))
262	>
263	>	static int plugaleak(RAY r, AMBVAL ap, FVECT anorm, double ang);
264	>	static double sumambient(COLOR acol, RAY *r, FVECT rn, int al,
265	>	AMBTREE *at, FVECT c0, double s);
266	>	static int makeambient(COLOR acol, RAY *r, FVECT rn, int al);
267	>	static int extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
268	>	FVECT uvw[3]);
269	>
270	>	void
271		multambient( /* compute ambient component & multiply by coef. */
272		COLOR aval,
273	<	register RAY *r,
273	>	RAY *r,
274		FVECT nrm
275		)
276		{
277		static int rdepth = 0; /* ambient recursion */
278	<	COLOR acol;
278	>	COLOR acol, caustic;
279	>	int ok;
280		double d, l;
281
282	+	/* PMAP: Factor in ambient from photon map, if enabled and ray is
283	+	* ambient. Return as all ambient components accounted for, else
284	+	* continue. */
285	+	if (ambPmap(aval, r, rdepth))
286	+	return;
287	+
288	+	/* PMAP: Factor in specular-diffuse ambient (caustics) from photon
289	+	* map, if enabled and ray is primary, else caustic is zero. Continue
290	+	* with RADIANCE ambient calculation */
291	+	copycolor(caustic, aval);
292	+	ambPmapCaustic(caustic, r, rdepth);
293	+
294		if (ambdiv <= 0) /* no ambient calculation */
295		goto dumbamb;
296		/* check number of bounces */
#	Line 275 \| Line 302 \| *multambient( / compute ambient component & multiply**
302		goto dumbamb;
303
304		if (ambacc <= FTINY) { /* no ambient storage */
305	+	copycolor(acol, aval);
306		rdepth++;
307	<	d = doambient(acol, r, aval, intens(aval)*r->rweight,
308	<	NULL, NULL);
307	>	ok = doambient(acol, r, r->rweight,
308	>	NULL, NULL, NULL, NULL, NULL);
309		rdepth--;
310	<	if (d <= FTINY)
310	>	if (!ok)
311		goto dumbamb;
312	+	copycolor(aval, acol);
313	+
314	+	/* PMAP: add in caustic */
315	+	addcolor(aval, caustic);
316	+	return;
317	+	}
318	+
319	+	if (tracktime) /* sort to minimize thrashing */
320	+	sortambvals(0);
321	+	/* interpolate ambient value */
322	+	setcolor(acol, 0.0, 0.0, 0.0);
323	+	d = sumambient(acol, r, nrm, rdepth,
324	+	&atrunk, thescene.cuorg, thescene.cusize);
325	+
326	+	if (d > FTINY) {
327	+	d = 1.0/d;
328	+	scalecolor(acol, d);
329		multcolor(aval, acol);
330	+
331	+	/* PMAP: add in caustic */
332	+	addcolor(aval, caustic);
333		return;
334		}
335	+
336	+	rdepth++; /* need to cache new value */
337	+	ok = makeambient(acol, r, nrm, rdepth-1);
338	+	rdepth--;
339	+
340	+	if (ok) {
341	+	multcolor(aval, acol); /* computed new value */
342
343	+	/* PMAP: add in caustic */
344	+	addcolor(aval, caustic);
345	+	return;
346	+	}
347	+
348	+	dumbamb: /* return global value */
349	+	if ((ambvwt <= 0) \| (navsum == 0)) {
350	+	multcolor(aval, ambval);
351	+
352	+	/* PMAP: add in caustic */
353	+	addcolor(aval, caustic);
354	+	return;
355	+	}
356	+
357	+	l = bright(ambval); /* average in computations */
358	+	if (l > FTINY) {
359	+	d = (log(l)*(double)ambvwt + avsum) /
360	+	(double)(ambvwt + navsum);
361	+	d = exp(d) / l;
362	+	scalecolor(aval, d);
363	+	multcolor(aval, ambval); /* apply color of ambval */
364	+	} else {
365	+	d = exp( avsum / (double)navsum );
366	+	scalecolor(aval, d); /* neutral color */
367	+	}
368	+	}
369	+
370	+
371	+	/* Plug a potential leak where ambient cache value is occluded */
372	+	static int
373	+	plugaleak(RAY r, AMBVAL ap, FVECT anorm, double ang)
374	+	{
375	+	const double cost70sq = 0.1169778; /* cos(70deg)^2 */
376	+	RAY rtst;
377	+	FVECT vdif;
378	+	double normdot, ndotd, nadotd;
379	+	double a, b, c, t[2];
380	+
381	+	ang += 2.PI(ang < 0); /* check direction flags */
382	+	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
383	+	return(0);
384	+	/*
385	+	* Generate test ray, targeting 20 degrees above sample point plane
386	+	* along surface normal from cache position. This should be high
387	+	* enough to miss local geometry we don't really care about.
388	+	*/
389	+	VSUB(vdif, ap->pos, r->rop);
390	+	normdot = DOT(anorm, r->ron);
391	+	ndotd = DOT(vdif, r->ron);
392	+	nadotd = DOT(vdif, anorm);
393	+	a = normdot*normdot - cost70sq;
394	+	b = 2.0(normdotndotd - nadotd*cost70sq);
395	+	c = ndotdndotd - DOT(vdif,vdif)cost70sq;
396	+	if (quadratic(t, a, b, c) != 2)
397	+	return(1); /* should rarely happen */
398	+	if (t[1] <= FTINY)
399	+	return(0); /* should fail behind test */
400	+	rayorigin(&rtst, SHADOW, r, NULL);
401	+	VSUM(rtst.rdir, vdif, anorm, t[1]); /* further dist. > plane */
402	+	rtst.rmax = normalize(rtst.rdir); /* short ray test */
403	+	while (localhit(&rtst, &thescene)) { /* check for occluder */
404	+	if (rtst.ro->omod != OVOID &&
405	+	(rtst.clipset == NULL \|\|
406	+	!inset(rtst.clipset, rtst.ro->omod)))
407	+	return(1); /* plug light leak */
408	+	VCOPY(rtst.rorg, rtst.rop); /* skip invisible surface */
409	+	rtst.rmax -= rtst.rot;
410	+	rayclear(&rtst);
411	+	}
412	+	return(0); /* seems we're OK */
413	+	}
414	+
415	+
416	+	static double
417	+	sumambient( /* get interpolated ambient value */
418	+	COLOR acol,
419	+	RAY *r,
420	+	FVECT rn,
421	+	int al,
422	+	AMBTREE *at,
423	+	FVECT c0,
424	+	double s
425	+	)
426	+	{ /* initial limit is 10 degrees plus ambacc radians */
427	+	const double minangle = 10.0 * PI/180.;
428	+	double maxangle = minangle + ambacc;
429	+	double wsum = 0.0;
430	+	FVECT ck0;
431	+	int i, j;
432	+	AMBVAL *av;
433	+
434	+	if (at->kid != NULL) { /* sum children first */
435	+	s *= 0.5;
436	+	for (i = 0; i < 8; i++) {
437	+	for (j = 0; j < 3; j++) {
438	+	ck0[j] = c0[j];
439	+	if (1<<j & i)
440	+	ck0[j] += s;
441	+	if (r->rop[j] < ck0[j] - OCTSCALE*s)
442	+	break;
443	+	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
444	+	break;
445	+	}
446	+	if (j == 3)
447	+	wsum += sumambient(acol, r, rn, al,
448	+	at->kid+i, ck0, s);
449	+	}
450	+	/* good enough? */
451	+	if (wsum >= 0.05 && s > minarad*10.0)
452	+	return(wsum);
453	+	}
454	+	/* adjust maximum angle */
455	+	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
456	+	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
457	+	/* sum this node */
458	+	for (av = at->alist; av != NULL; av = av->next) {
459	+	double u, v, d, delta_r2, delta_t2;
460	+	COLOR ct;
461	+	FVECT uvw[3];
462	+	/* record access */
463	+	if (tracktime)
464	+	av->latick = ambclock;
465	+	/*
466	+	* Ambient level test
467	+	*/
468	+	if (av->lvl > al \|\| /* list sorted, so this works */
469	+	(av->lvl == al) & (av->weight < 0.9*r->rweight))
470	+	break;
471	+	/*
472	+	* Direction test using unperturbed normal
473	+	*/
474	+	decodedir(uvw[2], av->ndir);
475	+	d = DOT(uvw[2], r->ron);
476	+	if (d <= 0.0) /* >= 90 degrees */
477	+	continue;
478	+	delta_r2 = 2.0 - 2.0d; / approx. radians^2 */
479	+	if (delta_r2 >= maxangle*maxangle)
480	+	continue;
481	+	/*
482	+	* Modified ray behind test
483	+	*/
484	+	VSUB(ck0, r->rop, av->pos);
485	+	d = DOT(ck0, uvw[2]);
486	+	if (d < -minarad*ambacc-.001)
487	+	continue;
488	+	d /= av->rad[0];
489	+	delta_t2 = d*d;
490	+	if (delta_t2 >= ambacc*ambacc)
491	+	continue;
492	+	/*
493	+	* Elliptical radii test based on Hessian
494	+	*/
495	+	decodedir(uvw[0], av->udir);
496	+	VCROSS(uvw[1], uvw[2], uvw[0]);
497	+	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
498	+	delta_t2 += d*d;
499	+	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
500	+	delta_t2 += d*d;
501	+	if (delta_t2 >= ambacc*ambacc)
502	+	continue;
503	+	/*
504	+	* Test for potential light leak
505	+	*/
506	+	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
507	+	continue;
508	+	/*
509	+	* Extrapolate value and compute final weight (hat function)
510	+	*/
511	+	if (!extambient(ct, av, r->rop, rn, uvw))
512	+	continue;
513	+	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
514	+	tfunc(ambacc, sqrt(delta_t2), 0.0);
515	+	scalecolor(ct, d);
516	+	addcolor(acol, ct);
517	+	wsum += d;
518	+	}
519	+	return(wsum);
520	+	}
521	+
522	+
523	+	static int
524	+	makeambient( /* make a new ambient value for storage */
525	+	COLOR acol,
526	+	RAY *r,
527	+	FVECT rn,
528	+	int al
529	+	)
530	+	{
531	+	AMBVAL amb;
532	+	FVECT uvw[3];
533	+	int i;
534	+
535	+	amb.weight = 1.0; /* compute weight */
536	+	for (i = al; i-- > 0; )
537	+	amb.weight *= AVGREFL;
538	+	if (r->rweight < 0.1amb.weight) / heuristic override */
539	+	amb.weight = 1.25*r->rweight;
540	+	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
541	+	/* compute ambient */
542	+	i = doambient(acol, r, amb.weight,
543	+	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
544	+	scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */
545	+	if (i <= 0 \|\| amb.rad[0] <= FTINY) /* no Hessian or zero radius */
546	+	return(i);
547	+	/* store value */
548	+	VCOPY(amb.pos, r->rop);
549	+	amb.ndir = encodedir(r->ron);
550	+	amb.udir = encodedir(uvw[0]);
551	+	amb.lvl = al;
552	+	copycolor(amb.val, acol);
553	+	/* insert into tree */
554	+	avsave(&amb); /* and save to file */
555	+	if (rn != r->ron) { /* texture */
556	+	VCOPY(uvw[2], r->ron);
557	+	extambient(acol, &amb, r->rop, rn, uvw);
558	+	}
559	+	return(1);
560	+	}
561	+
562	+
563	+	static int
564	+	extambient( /* extrapolate value at pv, nv */
565	+	COLOR cr,
566	+	AMBVAL *ap,
567	+	FVECT pv,
568	+	FVECT nv,
569	+	FVECT uvw[3]
570	+	)
571	+	{
572	+	const double min_d = 0.05;
573	+	static FVECT my_uvw[3];
574	+	FVECT v1;
575	+	int i;
576	+	double d = 1.0; /* zeroeth order */
577	+
578	+	if (uvw == NULL) { /* need local coordinates? */
579	+	decodedir(my_uvw[2], ap->ndir);
580	+	decodedir(my_uvw[0], ap->udir);
581	+	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
582	+	uvw = my_uvw;
583	+	}
584	+	for (i = 3; i--; ) /* gradient due to translation */
585	+	d += (pv[i] - ap->pos[i]) *
586	+	(ap->gpos[0]uvw[0][i] + ap->gpos[1]uvw[1][i]);
587	+
588	+	VCROSS(v1, uvw[2], nv); /* gradient due to rotation */
589	+	for (i = 3; i--; )
590	+	d += v1[i] * (ap->gdir[0]uvw[0][i] + ap->gdir[1]uvw[1][i]);
591	+
592	+	if (d < min_d) /* should not use if we can avoid it */
593	+	d = min_d;
594	+	copycolor(cr, ap->val);
595	+	scalecolor(cr, d);
596	+	return(d > min_d);
597	+	}
598	+
599	+
600	+	static void
601	+	avinsert( /* insert ambient value in our tree */
602	+	AMBVAL *av
603	+	)
604	+	{
605	+	AMBTREE *at;
606	+	AMBVAL *ap;
607	+	AMBVAL avh;
608	+	FVECT ck0;
609	+	double s;
610	+	int branch;
611	+	int i;
612	+
613	+	if (av->rad[0] <= FTINY)
614	+	error(CONSISTENCY, "zero ambient radius in avinsert");
615	+	at = &atrunk;
616	+	VCOPY(ck0, thescene.cuorg);
617	+	s = thescene.cusize;
618	+	while (s(OCTSCALE/2) > av->rad[1]ambacc) {
619	+	if (at->kid == NULL)
620	+	if ((at->kid = newambtree()) == NULL)
621	+	error(SYSTEM, "out of memory in avinsert");
622	+	s *= 0.5;
623	+	branch = 0;
624	+	for (i = 0; i < 3; i++)
625	+	if (av->pos[i] > ck0[i] + s) {
626	+	ck0[i] += s;
627	+	branch \|= 1 << i;
628	+	}
629	+	at = at->kid + branch;
630	+	}
631	+	avh.next = at->alist; /* order by increasing level */
632	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
633	+	if ( ap->next->lvl > av->lvl \|\|
634	+	(ap->next->lvl == av->lvl) &
635	+	(ap->next->weight <= av->weight) )
636	+	break;
637	+	av->next = ap->next;
638	+	ap->next = (AMBVAL*)av;
639	+	at->alist = avh.next;
640	+	}
641	+
642	+
643	+	#else /* ! NEWAMB */
644	+
645	+	static double sumambient(COLOR acol, RAY *r, FVECT rn, int al,
646	+	AMBTREE *at, FVECT c0, double s);
647	+	static double makeambient(COLOR acol, RAY *r, FVECT rn, int al);
648	+	static void extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
649	+
650	+
651	+	void
652	+	multambient( /* compute ambient component & multiply by coef. */
653	+	COLOR aval,
654	+	RAY *r,
655	+	FVECT nrm
656	+	)
657	+	{
658	+	static int rdepth = 0; /* ambient recursion */
659	+	COLOR acol, caustic;
660	+	double d, l;
661	+
662	+	/* PMAP: Factor in ambient from global photon map (if enabled) and return
663	+	* as all ambient components accounted for */
664	+	if (ambPmap(aval, r, rdepth))
665	+	return;
666	+
667	+	/* PMAP: Otherwise factor in ambient from caustic photon map
668	+	* (ambPmapCaustic() returns zero if caustic photons disabled) and
669	+	* continue with RADIANCE ambient calculation */
670	+	copycolor(caustic, aval);
671	+	ambPmapCaustic(caustic, r, rdepth);
672	+
673	+	if (ambdiv <= 0) /* no ambient calculation */
674	+	goto dumbamb;
675	+	/* check number of bounces */
676	+	if (rdepth >= ambounce)
677	+	goto dumbamb;
678	+	/* check ambient list */
679	+	if (ambincl != -1 && r->ro != NULL &&
680	+	ambincl != inset(ambset, r->ro->omod))
681	+	goto dumbamb;
682	+
683	+	if (ambacc <= FTINY) { /* no ambient storage */
684	+	copycolor(acol, aval);
685	+	rdepth++;
686	+	d = doambient(acol, r, r->rweight, NULL, NULL);
687	+	rdepth--;
688	+	if (d <= FTINY)
689	+	goto dumbamb;
690	+	copycolor(aval, acol);
691	+
692	+	/* PMAP: add in caustic */
693	+	addcolor(aval, caustic);
694	+	return;
695	+	}
696	+
697		if (tracktime) /* sort to minimize thrashing */
698		sortambvals(0);
699	<	/* get ambient value */
699	>	/* interpolate ambient value */
700		setcolor(acol, 0.0, 0.0, 0.0);
701	<	d = sumambient(acol, r, intens(aval)*r->rweight, nrm, rdepth,
701	>	d = sumambient(acol, r, nrm, rdepth,
702		&atrunk, thescene.cuorg, thescene.cusize);
703	+
704		if (d > FTINY) {
705	<	scalecolor(acol, 1.0/d);
705	>	d = 1.0/d;
706	>	scalecolor(acol, d);
707		multcolor(aval, acol);
708	+
709	+	/* PMAP: add in caustic */
710	+	addcolor(aval, caustic);
711		return;
712		}
713	+
714		rdepth++; /* need to cache new value */
715	<	d = makeambient(acol, r, aval, nrm, rdepth-1);
715	>	d = makeambient(acol, r, nrm, rdepth-1);
716		rdepth--;
717	+
718		if (d > FTINY) {
719		multcolor(aval, acol); /* got new value */
720	+
721	+	/* PMAP: add in caustic */
722	+	addcolor(aval, caustic);
723		return;
724		}
725	+
726		dumbamb: /* return global value */
727		if ((ambvwt <= 0) \| (navsum == 0)) {
728		multcolor(aval, ambval);
729	+
730	+	/* PMAP: add in caustic */
731	+	addcolor(aval, caustic);
732		return;
733		}
734	+
735		l = bright(ambval); /* average in computations */
736		if (l > FTINY) {
737		d = (log(l)*(double)ambvwt + avsum) /
#	Line 322 \| Line 746 \| *dumbamb: / return global value /*
746		}
747
748
749	<	extern double
749	>	static double
750		sumambient( /* get interpolated ambient value */
751		COLOR acol,
752	<	register RAY *r,
329	<	double rw,
752	>	RAY *r,
753		FVECT rn,
754		int al,
755		AMBTREE *at,
#	Line 338 \| Line 761 \| *sumambient( / get interpolated ambient value /*
761		COLOR ct;
762		FVECT ck0;
763		int i;
764	<	register int j;
765	<	register AMBVAL *av;
764	>	int j;
765	>	AMBVAL *av;
766
767		wsum = 0.0;
768		/* do this node */
#	Line 350 \| Line 773 \| *sumambient( / get interpolated ambient value /*
773		/*
774		* Ambient level test.
775		*/
776	<	if (av->lvl > al) /* list sorted, so this works */
776	>	if (av->lvl > al \|\| /* list sorted, so this works */
777	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
778		break;
355	–	if (av->weight < 0.9*rw)
356	–	continue;
779		/*
780		* Ambient radius test.
781		*/
782	<	d = av->pos[0] - r->rop[0];
783	<	e1 = d * d;
362	<	d = av->pos[1] - r->rop[1];
363	<	e1 += d * d;
364	<	d = av->pos[2] - r->rop[2];
365	<	e1 += d * d;
366	<	e1 /= av->rad * av->rad;
782	>	VSUB(ck0, av->pos, r->rop);
783	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
784		if (e1 > ambaccambacc1.21)
785		continue;
786		/*
#	Line 380 \| Line 797 \| *sumambient( / get interpolated ambient value /*
797		}
798		}
799		e2 = (1.0 - d) * r->rweight;
800	<	if (e2 < 0.0) e2 = 0.0;
801	<	if (e1 + e2 > ambaccambacc1.21)
800	>	if (e2 < 0.0)
801	>	e2 = 0.0;
802	>	else if (e1 + e2 > ambaccambacc1.21)
803		continue;
804		/*
805		* Ray behind test.
#	Line 431 \| Line 849 \| *sumambient( / get interpolated ambient value /*
849		break;
850		}
851		if (j == 3)
852	<	wsum += sumambient(acol, r, rw, rn, al,
852	>	wsum += sumambient(acol, r, rn, al,
853		at->kid+i, ck0, s);
854		}
855		return(wsum);
856		}
857
858
859	<	extern double
860	<	makeambient( /* make a new ambient value */
859	>	static double
860	>	makeambient( /* make a new ambient value for storage */
861		COLOR acol,
862		RAY *r,
445	–	COLOR ac,
863		FVECT rn,
864		int al
865		)
866		{
867		AMBVAL amb;
451	–	double coef;
868		FVECT gp, gd;
869	<	/* compute weight */
870	<	amb.weight = pow(AVGREFL, (double)al);
871	<	coef = intens(ac)*r->rweight;
872	<	if (coef < 0.1amb.weight) / heuristic */
873	<	amb.weight = coef;
869	>	int i;
870	>
871	>	amb.weight = 1.0; /* compute weight */
872	>	for (i = al; i-- > 0; )
873	>	amb.weight *= AVGREFL;
874	>	if (r->rweight < 0.1amb.weight) / heuristic override */
875	>	amb.weight = 1.25*r->rweight;
876	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
877		/* compute ambient */
878	<	amb.rad = doambient(acol, r, ac, amb.weight, gp, gd);
879	<	if (amb.rad <= FTINY)
878	>	amb.rad = doambient(acol, r, amb.weight, gp, gd);
879	>	if (amb.rad <= FTINY) {
880	>	setcolor(acol, 0.0, 0.0, 0.0);
881		return(0.0);
882	<	/* store it */
882	>	}
883	>	scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */
884	>	/* store value */
885		VCOPY(amb.pos, r->rop);
886		VCOPY(amb.dir, r->ron);
887		amb.lvl = al;
#	Line 474 \| Line 896 \| *makeambient( / make a new ambient value /*
896		}
897
898
899	<	extern void
899	>	static void
900		extambient( /* extrapolate value at pv, nv */
901		COLOR cr,
902	<	register AMBVAL *ap,
902	>	AMBVAL *ap,
903		FVECT pv,
904		FVECT nv
905		)
906		{
907		FVECT v1;
908	<	register int i;
908	>	int i;
909		double d;
910
911		d = 1.0; /* zeroeth order */
#	Line 503 \| Line 925 \| *extambient( / extrapolate value at pv, nv /*
925
926
927		static void
928	+	avinsert( /* insert ambient value in our tree */
929	+	AMBVAL *av
930	+	)
931	+	{
932	+	AMBTREE *at;
933	+	AMBVAL *ap;
934	+	AMBVAL avh;
935	+	FVECT ck0;
936	+	double s;
937	+	int branch;
938	+	int i;
939	+
940	+	if (av->rad <= FTINY)
941	+	error(CONSISTENCY, "zero ambient radius in avinsert");
942	+	at = &atrunk;
943	+	VCOPY(ck0, thescene.cuorg);
944	+	s = thescene.cusize;
945	+	while (s(OCTSCALE/2) > av->radambacc) {
946	+	if (at->kid == NULL)
947	+	if ((at->kid = newambtree()) == NULL)
948	+	error(SYSTEM, "out of memory in avinsert");
949	+	s *= 0.5;
950	+	branch = 0;
951	+	for (i = 0; i < 3; i++)
952	+	if (av->pos[i] > ck0[i] + s) {
953	+	ck0[i] += s;
954	+	branch \|= 1 << i;
955	+	}
956	+	at = at->kid + branch;
957	+	}
958	+	avh.next = at->alist; /* order by increasing level */
959	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
960	+	if ( ap->next->lvl > av->lvl \|\|
961	+	(ap->next->lvl == av->lvl) &
962	+	(ap->next->weight <= av->weight) )
963	+	break;
964	+	av->next = ap->next;
965	+	ap->next = (AMBVAL*)av;
966	+	at->alist = avh.next;
967	+	}
968	+
969	+	#endif /* ! NEWAMB */
970	+
971	+	/*********** FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS *************/
972	+
973	+	static void
974		initambfile( /* initialize ambient file */
975	<	int creat
975	>	int cre8
976		)
977		{
978		extern char progname, octname;
979		static char *mybuf = NULL;
980
981		#ifdef F_SETLKW
982	<	aflock(creat ? F_WRLCK : F_RDLCK);
982	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
983		#endif
984		SET_FILE_BINARY(ambfp);
985		if (mybuf == NULL)
986		mybuf = (char *)bmalloc(BUFSIZ+8);
987		setbuf(ambfp, mybuf);
988	<	if (creat) { /* new file */
988	>	if (cre8) { /* new file */
989		newheader("RADIANCE", ambfp);
990		fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
991		progname, colval(ambval,RED),
#	Line 526 \| Line 994 \| *initambfile( / initialize ambient file /*
994		fprintf(ambfp, "-ad %d -as %d -ar %d ",
995		ambdiv, ambssamp, ambres);
996		if (octname != NULL)
997	<	printargs(1, &octname, ambfp);
998	<	else
531	<	fputc('\n', ambfp);
997	>	fputs(octname, ambfp);
998	>	fputc('\n', ambfp);
999		fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1000		fputnow(ambfp);
1001		fputformat(AMBFMT, ambfp);
1002	<	putc('\n', ambfp);
1002	>	fputc('\n', ambfp);
1003		putambmagic(ambfp);
1004		} else if (checkheader(ambfp, AMBFMT, NULL) < 0 \|\| !hasambmagic(ambfp))
1005		error(USER, "bad ambient file");
#	Line 544 \| Line 1011 \| *avsave( / insert and save an ambient value /*
1011		AMBVAL *av
1012		)
1013		{
1014	<	avinsert(avstore(av));
1014	>	avstore(av);
1015		if (ambfp == NULL)
1016		return;
1017		if (writambval(av, ambfp) < 0)
#	Line 559 \| Line 1026 \| writerr:
1026
1027
1028		static AMBVAL *
1029	<	avstore( /* allocate memory and store aval */
1030	<	register AMBVAL *aval
1029	>	avstore( /* allocate memory and save aval */
1030	>	AMBVAL *aval
1031		)
1032		{
1033	<	register AMBVAL *av;
1033	>	AMBVAL *av;
1034		double d;
1035
1036		if ((av = newambval()) == NULL)
#	Line 577 \| Line 1044 \| *avstore( / allocate memory and store aval /*
1044		avsum += log(d);
1045		navsum++;
1046		}
1047	+	avinsert(av); /* insert in our cache tree */
1048		return(av);
1049		}
1050
#	Line 589 \| Line 1057 \| *static AMBTREE atfreelist = NULL; /* free ambient tr**
1057		static AMBTREE *
1058		newambtree(void) /* allocate 8 ambient tree structs */
1059		{
1060	<	register AMBTREE atp, upperlim;
1060	>	AMBTREE atp, upperlim;
1061
1062		if (atfreelist == NULL) { /* get more nodes */
1063		atfreelist = (AMBTREE )malloc(ATALLOCSZ8*sizeof(AMBTREE));
#	Line 603 \| Line 1071 \| *newambtree(void) / allocate 8 ambient tree structs**
1071		}
1072		atp = atfreelist;
1073		atfreelist = atp->kid;
1074	<	memset((char )atp, '\0', 8sizeof(AMBTREE));
1074	>	memset(atp, 0, 8*sizeof(AMBTREE));
1075		return(atp);
1076		}
1077
#	Line 619 \| Line 1087 \| *freeambtree( / free 8 ambient tree structs /*
1087
1088
1089		static void
622	–	avinsert( /* insert ambient value in our tree */
623	–	void *av
624	–	)
625	–	{
626	–	register AMBTREE *at;
627	–	register AMBVAL *ap;
628	–	AMBVAL avh;
629	–	FVECT ck0;
630	–	double s;
631	–	int branch;
632	–	register int i;
633	–
634	–	if (((AMBVAL*)av)->rad <= FTINY)
635	–	error(CONSISTENCY, "zero ambient radius in avinsert");
636	–	at = &atrunk;
637	–	VCOPY(ck0, thescene.cuorg);
638	–	s = thescene.cusize;
639	–	while (s(OCTSCALE/2) > ((AMBVAL)av)->rad*ambacc) {
640	–	if (at->kid == NULL)
641	–	if ((at->kid = newambtree()) == NULL)
642	–	error(SYSTEM, "out of memory in avinsert");
643	–	s *= 0.5;
644	–	branch = 0;
645	–	for (i = 0; i < 3; i++)
646	–	if (((AMBVAL*)av)->pos[i] > ck0[i] + s) {
647	–	ck0[i] += s;
648	–	branch \|= 1 << i;
649	–	}
650	–	at = at->kid + branch;
651	–	}
652	–	avh.next = at->alist; /* order by increasing level */
653	–	for (ap = &avh; ap->next != NULL; ap = ap->next)
654	–	if (ap->next->lvl >= ((AMBVAL*)av)->lvl)
655	–	break;
656	–	((AMBVAL*)av)->next = ap->next;
657	–	ap->next = (AMBVAL*)av;
658	–	at->alist = avh.next;
659	–	}
660	–
661	–
662	–	static void
1090		unloadatree( /* unload an ambient value tree */
1091	<	register AMBTREE *at,
1091	>	AMBTREE *at,
1092		unloadtf_t *f
1093		)
1094		{
1095	<	register AMBVAL *av;
1096	<	register int i;
1095	>	AMBVAL *av;
1096	>	int i;
1097		/* transfer values at this node */
1098		for (av = at->alist; av != NULL; av = at->alist) {
1099		at->alist = av->next;
1100	+	av->next = NULL;
1101		(*f)(av);
1102		}
1103		if (at->kid == NULL)
#	Line 691 \| Line 1119 \| *static int i_avlist; / index for lists /*
1119		static int alatcmp(const void av1, const void av2);
1120
1121		static void
1122	+	avfree(AMBVAL *av)
1123	+	{
1124	+	free(av);
1125	+	}
1126	+
1127	+	static void
1128		av2list(
1129	<	void *av
1129	>	AMBVAL *av
1130		)
1131		{
1132		#ifdef DEBUG
#	Line 700 \| Line 1134 \| av2list(
1134		error(CONSISTENCY, "too many ambient values in av2list1");
1135		#endif
1136		avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1137	<	avlist1[i_avlist++].t = ((AMBVAL*)av)->latick;
1137	>	avlist1[i_avlist++].t = av->latick;
1138		}
1139
1140
#	Line 710 \| Line 1144 \| *alatcmp( / compare ambient values for MRA /*
1144		const void *av2
1145		)
1146		{
1147	<	register long lc = ((struct avl )av2)->t - ((struct avl )av1)->t;
1147	>	long lc = ((struct avl )av2)->t - ((struct avl )av1)->t;
1148		return(lc<0 ? -1 : lc>0 ? 1 : 0);
1149		}
1150
#	Line 727 \| Line 1161 \| *aposcmp( / compare ambient value positions /*
1161		const void *avp2
1162		)
1163		{
1164	<	register long diff = (char const )avp1 - (char * const *)avp2;
1164	>	long diff = (char const )avp1 - (char * const *)avp2;
1165		if (diff < 0)
1166		return(-1);
1167		return(diff > 0);
1168		}
1169
1170	<	#if 1
1170	>
1171		static int
1172		avlmemi( /* find list position from address */
1173		AMBVAL *avaddr
1174		)
1175		{
1176	<	register AMBVAL **avlpp;
1176	>	AMBVAL **avlpp;
1177
1178	<	avlpp = (AMBVAL *)bsearch((char )&avaddr, (char *)avlist2,
1178	>	avlpp = (AMBVAL **)bsearch(&avaddr, avlist2,
1179		nambvals, sizeof(AMBVAL *), aposcmp);
1180		if (avlpp == NULL)
1181		error(CONSISTENCY, "address not found in avlmemi");
1182		return(avlpp - avlist2);
1183		}
750	–	#else
751	–	#define avlmemi(avaddr) ((AMBVAL *)bsearch((char )&avaddr,(char *)avlist2, \
752	–	nambvals,sizeof(AMBVAL *),aposcmp) - avlist2)
753	–	#endif
1184
1185
1186		static void
#	Line 760 \| Line 1190 \| *sortambvals( / resort ambient values /*
1190		{
1191		AMBTREE oldatrunk;
1192		AMBVAL tav, tap, pnext;
1193	<	register int i, j;
1193	>	int i, j;
1194		/* see if it's time yet */
1195		if (!always && (ambclock++ < lastsort+sortintvl \|\|
1196		nambvals < SORT_THRESH))
#	Line 789 \| Line 1219 \| *sortambvals( / resort ambient values /*
1219		}
1220		if (avlist1 == NULL) { /* no time tracking -- rebuild tree? */
1221		if (avlist2 != NULL)
1222	<	free((void *)avlist2);
1222	>	free(avlist2);
1223		if (always) { /* rebuild without sorting */
1224		oldatrunk = atrunk;
1225		atrunk.alist = NULL;
#	Line 816 \| Line 1246 \| *sortambvals( / resort ambient values /*
1246		if (i_avlist < nambvals)
1247		error(CONSISTENCY, "missing ambient values in sortambvals");
1248		#endif
1249	<	qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp);
1250	<	qsort((char )avlist2, nambvals, sizeof(AMBVAL ), aposcmp);
1249	>	qsort(avlist1, nambvals, sizeof(struct avl), alatcmp);
1250	>	qsort(avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1251		for (i = 0; i < nambvals; i++) {
1252		if (avlist1[i].p == NULL)
1253		continue;
#	Line 833 \| Line 1263 \| *sortambvals( / resort ambient values /*
1263		avinsert(avlist2[j]);
1264		avlist1[j].p = NULL;
1265		}
1266	<	free((void *)avlist1);
1267	<	free((void *)avlist2);
1266	>	free(avlist1);
1267	>	free(avlist2);
1268		/* compute new sort interval */
1269		sortintvl = ambclock - lastsort;
1270		if (sortintvl >= MAX_SORT_INTVL/2)
#	Line 860 \| Line 1290 \| *aflock( / lock/unlock ambient file /*
1290		{
1291		static struct flock fls; /* static so initialized to zeroes */
1292
1293	+	if (typ == fls.l_type) /* already called? */
1294	+	return;
1295		fls.l_type = typ;
1296		if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1297		error(SYSTEM, "cannot (un)lock ambient file");
1298		}
1299
1300
1301	<	extern int
1301	>	int
1302		ambsync(void) /* synchronize ambient file */
1303		{
1304		long flen;
1305		AMBVAL avs;
1306	<	register int n;
1306	>	int n;
1307
1308	<	if (nunflshed == 0)
1308	>	if (ambfp == NULL) /* no ambient file? */
1309		return(0);
1310	<	if (lastpos < 0) /* initializing (locked in initambfile) */
1311	<	goto syncend;
880	<	/* gain exclusive access */
881	<	aflock(F_WRLCK);
1310	>	/* gain appropriate access */
1311	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1312		/* see if file has grown */
1313		if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1314		goto seekerr;
1315	<	if ( (n = flen - lastpos) ) { /* file has grown */
1315	>	if ((n = flen - lastpos) > 0) { /* file has grown */
1316		if (ambinp == NULL) { /* use duplicate filedes */
1317		ambinp = fdopen(dup(fileno(ambfp)), "r");
1318		if (ambinp == NULL)
1319		error(SYSTEM, "fdopen failed in ambsync");
1320		}
1321	<	if (fseek(ambinp, lastpos, 0) < 0)
1321	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1322		goto seekerr;
1323		while (n >= AMBVALSIZ) { /* load contributed values */
1324		if (!readambval(&avs, ambinp)) {
#	Line 898 \| Line 1328 \| *ambsync(void) / synchronize ambient file /*
1328		error(WARNING, errmsg);
1329		break;
1330		}
1331	<	avinsert(avstore(&avs));
1331	>	avstore(&avs);
1332		n -= AMBVALSIZ;
1333		}
1334	+	lastpos = flen - n;
1335		/*** seek always as safety measure
1336		if (n) **/ / alignment */
1337	<	if (lseek(fileno(ambfp), (off_t)(flen-n), SEEK_SET) < 0)
1337	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1338		goto seekerr;
1339		}
909	–	#ifdef DEBUG
910	–	if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) {
911	–	sprintf(errmsg, "ambient file buffer at %d rather than %d",
912	–	ambfp->_ptr - ambfp->_base,
913	–	nunflshed*AMBVALSIZ);
914	–	error(CONSISTENCY, errmsg);
915	–	}
916	–	#endif
917	–	syncend:
1340		n = fflush(ambfp); /* calls write() at last */
1341	<	if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1341	>	if (n != EOF)
1342	>	lastpos += (long)nunflshed*AMBVALSIZ;
1343	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1344		goto seekerr;
1345	+
1346		aflock(F_UNLCK); /* release file */
1347		nunflshed = 0;
1348		return(n);
#	Line 926 \| Line 1351 \| seekerr:
1351		return -1; /* pro forma return */
1352		}
1353
1354	<	#else
1354	>	#else /* ! F_SETLKW */
1355
1356	<	extern int
1356	>	int
1357		ambsync(void) /* flush ambient file */
1358		{
1359	<	if (nunflshed == 0)
1359	>	if (ambfp == NULL)
1360		return(0);
1361		nunflshed = 0;
1362		return(fflush(ambfp));
1363		}
1364
1365	<	#endif
1365	>	#endif /* ! F_SETLKW */

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Comparing ray/src/rt/ambient.c (file contents): Revision 2.59 by greg, Wed May 25 18:06:22 2005 UTC vs. Revision 2.102 by greg, Sun Apr 24 16:21:32 2016 UTC

Diff Legend

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.59 by greg, Wed May 25 18:06:22 2005 UTC vs.
Revision 2.102 by greg, Sun Apr 24 16:21:32 2016 UTC