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

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.53 by schorsch, Mon Jul 21 22:30:19 2003 UTC vs.
Revision 2.103 by greg, Tue Nov 1 20:39:39 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 14 \| Line 12 \| static const char RCSid[] = "$Id$";
12		#include "platform.h"
13		#include "ray.h"
14		#include "otypes.h"
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 23 \| Line 23 \| static const char RCSid[] = "$Id$";
23
24		extern char shm_boundary; / memory sharing boundary */
25
26	<	#define MAXASET 511 /* maximum number of elements in ambient set */
26	>	#ifndef MAXASET
27	>	#define MAXASET 4095 /* maximum number of elements in ambient set */
28	>	#endif
29		OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */
30
31		double maxarad; /* maximum ambient radius */
#	Line 36 \| 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 48 \| 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 73 \| Line 76 \| *static long lastpos = -1; / last flush position /*
76		#define AMBFLUSH (BUFSIZ/AMBVALSIZ)
77
78		#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL))
76	–	#define freeav(av) free((void *)av);
79
80	<	static void initambfile(), avsave(), avinsert(), sortambvals(), unloadatree();
81	<	static int avlmemi();
82	<	static AMBVAL *avstore();
80	>	static void initambfile(int creat);
81	>	static void avsave(AMBVAL *av);
82	>	static AMBVAL avstore(AMBVAL aval);
83	>	static AMBTREE *newambtree(void);
84	>	static void freeambtree(AMBTREE *atp);
85	>
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);
93	>	static int avlmemi(AMBVAL *avaddr);
94	>	static void sortambvals(int always);
95	>
96		#ifdef F_SETLKW
97	<	static void aflock();
97	>	static void aflock(int typ);
98		#endif
99
100
101		void
102	<	setambres(ar) /* set ambient resolution */
103	<	int ar;
102	>	setambres( /* set ambient resolution */
103	>	int ar
104	>	)
105		{
106		ambres = ar < 0 ? 0 : ar; /* may be done already */
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		void
125	<	setambacc(newa) /* set ambient accuracy */
126	<	double newa;
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		void
141	<	setambient() /* initialize calculation */
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 143 \| Line 161 \| *setambient() / 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 157 \| Line 175 \| *setambient() / initialize calculation /*
175		return; /* avoid ambsync() */
176		}
177		/* align file pointer */
178	<	pos += (long)nambvals*AMBVALSIZ;
179	<	flen = lseek(fileno(ambfp), (off_t)0L, 2);
180	<	if (flen != pos) {
178	>	lastpos += (long)nambvals*AMBVALSIZ;
179	>	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
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 */
169	<	ftruncate(fileno(ambfp), (off_t)pos);
170	<	#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		void
203	<	ambdone() /* close ambient file and free memory */
203	>	ambdone(void) /* close ambient file and free memory */
204		{
205		if (ambfp != NULL) { /* close ambient file */
206		ambsync();
#	Line 194 \| Line 213 \| *ambdone() / 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 207 \| Line 226 \| *ambdone() / close ambient file and free memory /*
226
227
228		void
229	<	ambnotify(obj) /* record new modifier */
230	<	OBJECT obj;
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 234 \| Line 254 \| OBJECT obj;
254		}
255		}
256
257	+	/********** THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD *************/
258
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	<	ambient(acol, r, nrm) /* compute ambient component for ray */
272	<	COLOR acol;
273	<	register RAY *r;
274	<	FVECT nrm;
271	>	multambient( /* compute ambient component & multiply by coef. */
272	>	COLOR aval,
273	>	RAY *r,
274	>	FVECT nrm
275	>	)
276		{
277		static int rdepth = 0; /* ambient recursion */
278	+	COLOR acol, caustic;
279	+	int i, 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 255 \| Line 302 \| FVECT nrm;
302		goto dumbamb;
303
304		if (ambacc <= FTINY) { /* no ambient storage */
305	+	FVECT uvd[2];
306	+	float dgrad[2], *dgp = NULL;
307	+
308	+	if (nrm != r->ron && DOT(nrm,r->ron) < 0.9999)
309	+	dgp = dgrad; /* compute rotational grad. */
310	+	copycolor(acol, aval);
311		rdepth++;
312	+	ok = doambient(acol, r, r->rweight,
313	+	uvd, NULL, NULL, dgp, NULL);
314	+	rdepth--;
315	+	if (!ok)
316	+	goto dumbamb;
317	+	if ((ok > 0) & (dgp != NULL)) { /* apply texture */
318	+	FVECT v1;
319	+	VCROSS(v1, r->ron, nrm);
320	+	d = 1.0;
321	+	for (i = 3; i--; )
322	+	d += v1[i] * (dgp[0]uvd[0][i] + dgp[1]uvd[1][i]);
323	+	if (d >= 0.05)
324	+	scalecolor(acol, d);
325	+	}
326	+	copycolor(aval, acol);
327	+
328	+	/* PMAP: add in caustic */
329	+	addcolor(aval, caustic);
330	+	return;
331	+	}
332	+
333	+	if (tracktime) /* sort to minimize thrashing */
334	+	sortambvals(0);
335	+	/* interpolate ambient value */
336	+	setcolor(acol, 0.0, 0.0, 0.0);
337	+	d = sumambient(acol, r, nrm, rdepth,
338	+	&atrunk, thescene.cuorg, thescene.cusize);
339	+
340	+	if (d > FTINY) {
341	+	d = 1.0/d;
342	+	scalecolor(acol, d);
343	+	multcolor(aval, acol);
344	+
345	+	/* PMAP: add in caustic */
346	+	addcolor(aval, caustic);
347	+	return;
348	+	}
349	+
350	+	rdepth++; /* need to cache new value */
351	+	ok = makeambient(acol, r, nrm, rdepth-1);
352	+	rdepth--;
353	+
354	+	if (ok) {
355	+	multcolor(aval, acol); /* computed new value */
356	+
357	+	/* PMAP: add in caustic */
358	+	addcolor(aval, caustic);
359	+	return;
360	+	}
361	+
362	+	dumbamb: /* return global value */
363	+	if ((ambvwt <= 0) \| (navsum == 0)) {
364	+	multcolor(aval, ambval);
365	+
366	+	/* PMAP: add in caustic */
367	+	addcolor(aval, caustic);
368	+	return;
369	+	}
370	+
371	+	l = bright(ambval); /* average in computations */
372	+	if (l > FTINY) {
373	+	d = (log(l)*(double)ambvwt + avsum) /
374	+	(double)(ambvwt + navsum);
375	+	d = exp(d) / l;
376	+	scalecolor(aval, d);
377	+	multcolor(aval, ambval); /* apply color of ambval */
378	+	} else {
379	+	d = exp( avsum / (double)navsum );
380	+	scalecolor(aval, d); /* neutral color */
381	+	}
382	+	}
383	+
384	+
385	+	/* Plug a potential leak where ambient cache value is occluded */
386	+	static int
387	+	plugaleak(RAY r, AMBVAL ap, FVECT anorm, double ang)
388	+	{
389	+	const double cost70sq = 0.1169778; /* cos(70deg)^2 */
390	+	RAY rtst;
391	+	FVECT vdif;
392	+	double normdot, ndotd, nadotd;
393	+	double a, b, c, t[2];
394	+
395	+	ang += 2.PI(ang < 0); /* check direction flags */
396	+	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
397	+	return(0);
398	+	/*
399	+	* Generate test ray, targeting 20 degrees above sample point plane
400	+	* along surface normal from cache position. This should be high
401	+	* enough to miss local geometry we don't really care about.
402	+	*/
403	+	VSUB(vdif, ap->pos, r->rop);
404	+	normdot = DOT(anorm, r->ron);
405	+	ndotd = DOT(vdif, r->ron);
406	+	nadotd = DOT(vdif, anorm);
407	+	a = normdot*normdot - cost70sq;
408	+	b = 2.0(normdotndotd - nadotd*cost70sq);
409	+	c = ndotdndotd - DOT(vdif,vdif)cost70sq;
410	+	if (quadratic(t, a, b, c) != 2)
411	+	return(1); /* should rarely happen */
412	+	if (t[1] <= FTINY)
413	+	return(0); /* should fail behind test */
414	+	rayorigin(&rtst, SHADOW, r, NULL);
415	+	VSUM(rtst.rdir, vdif, anorm, t[1]); /* further dist. > plane */
416	+	rtst.rmax = normalize(rtst.rdir); /* short ray test */
417	+	while (localhit(&rtst, &thescene)) { /* check for occluder */
418	+	if (rtst.ro->omod != OVOID &&
419	+	(rtst.clipset == NULL \|\|
420	+	!inset(rtst.clipset, rtst.ro->omod)))
421	+	return(1); /* plug light leak */
422	+	VCOPY(rtst.rorg, rtst.rop); /* skip invisible surface */
423	+	rtst.rmax -= rtst.rot;
424	+	rayclear(&rtst);
425	+	}
426	+	return(0); /* seems we're OK */
427	+	}
428	+
429	+
430	+	static double
431	+	sumambient( /* get interpolated ambient value */
432	+	COLOR acol,
433	+	RAY *r,
434	+	FVECT rn,
435	+	int al,
436	+	AMBTREE *at,
437	+	FVECT c0,
438	+	double s
439	+	)
440	+	{ /* initial limit is 10 degrees plus ambacc radians */
441	+	const double minangle = 10.0 * PI/180.;
442	+	double maxangle = minangle + ambacc;
443	+	double wsum = 0.0;
444	+	FVECT ck0;
445	+	int i, j;
446	+	AMBVAL *av;
447	+
448	+	if (at->kid != NULL) { /* sum children first */
449	+	s *= 0.5;
450	+	for (i = 0; i < 8; i++) {
451	+	for (j = 0; j < 3; j++) {
452	+	ck0[j] = c0[j];
453	+	if (1<<j & i)
454	+	ck0[j] += s;
455	+	if (r->rop[j] < ck0[j] - OCTSCALE*s)
456	+	break;
457	+	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
458	+	break;
459	+	}
460	+	if (j == 3)
461	+	wsum += sumambient(acol, r, rn, al,
462	+	at->kid+i, ck0, s);
463	+	}
464	+	/* good enough? */
465	+	if (wsum >= 0.05 && s > minarad*10.0)
466	+	return(wsum);
467	+	}
468	+	/* adjust maximum angle */
469	+	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
470	+	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
471	+	/* sum this node */
472	+	for (av = at->alist; av != NULL; av = av->next) {
473	+	double u, v, d, delta_r2, delta_t2;
474	+	COLOR ct;
475	+	FVECT uvw[3];
476	+	/* record access */
477	+	if (tracktime)
478	+	av->latick = ambclock;
479	+	/*
480	+	* Ambient level test
481	+	*/
482	+	if (av->lvl > al \|\| /* list sorted, so this works */
483	+	(av->lvl == al) & (av->weight < 0.9*r->rweight))
484	+	break;
485	+	/*
486	+	* Direction test using unperturbed normal
487	+	*/
488	+	decodedir(uvw[2], av->ndir);
489	+	d = DOT(uvw[2], r->ron);
490	+	if (d <= 0.0) /* >= 90 degrees */
491	+	continue;
492	+	delta_r2 = 2.0 - 2.0d; / approx. radians^2 */
493	+	if (delta_r2 >= maxangle*maxangle)
494	+	continue;
495	+	/*
496	+	* Modified ray behind test
497	+	*/
498	+	VSUB(ck0, r->rop, av->pos);
499	+	d = DOT(ck0, uvw[2]);
500	+	if (d < -minarad*ambacc-.001)
501	+	continue;
502	+	d /= av->rad[0];
503	+	delta_t2 = d*d;
504	+	if (delta_t2 >= ambacc*ambacc)
505	+	continue;
506	+	/*
507	+	* Elliptical radii test based on Hessian
508	+	*/
509	+	decodedir(uvw[0], av->udir);
510	+	VCROSS(uvw[1], uvw[2], uvw[0]);
511	+	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
512	+	delta_t2 += d*d;
513	+	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
514	+	delta_t2 += d*d;
515	+	if (delta_t2 >= ambacc*ambacc)
516	+	continue;
517	+	/*
518	+	* Test for potential light leak
519	+	*/
520	+	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
521	+	continue;
522	+	/*
523	+	* Extrapolate value and compute final weight (hat function)
524	+	*/
525	+	if (!extambient(ct, av, r->rop, rn, uvw))
526	+	continue;
527	+	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
528	+	tfunc(ambacc, sqrt(delta_t2), 0.0);
529	+	scalecolor(ct, d);
530	+	addcolor(acol, ct);
531	+	wsum += d;
532	+	}
533	+	return(wsum);
534	+	}
535	+
536	+
537	+	static int
538	+	makeambient( /* make a new ambient value for storage */
539	+	COLOR acol,
540	+	RAY *r,
541	+	FVECT rn,
542	+	int al
543	+	)
544	+	{
545	+	AMBVAL amb;
546	+	FVECT uvw[3];
547	+	int i;
548	+
549	+	amb.weight = 1.0; /* compute weight */
550	+	for (i = al; i-- > 0; )
551	+	amb.weight *= AVGREFL;
552	+	if (r->rweight < 0.1amb.weight) / heuristic override */
553	+	amb.weight = 1.25*r->rweight;
554	+	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
555	+	/* compute ambient */
556	+	i = doambient(acol, r, amb.weight,
557	+	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
558	+	scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */
559	+	if (i <= 0 \|\| amb.rad[0] <= FTINY) /* no Hessian or zero radius */
560	+	return(i);
561	+	/* store value */
562	+	VCOPY(amb.pos, r->rop);
563	+	amb.ndir = encodedir(r->ron);
564	+	amb.udir = encodedir(uvw[0]);
565	+	amb.lvl = al;
566	+	copycolor(amb.val, acol);
567	+	/* insert into tree */
568	+	avsave(&amb); /* and save to file */
569	+	if (rn != r->ron) { /* texture */
570	+	VCOPY(uvw[2], r->ron);
571	+	extambient(acol, &amb, r->rop, rn, uvw);
572	+	}
573	+	return(1);
574	+	}
575	+
576	+
577	+	static int
578	+	extambient( /* extrapolate value at pv, nv */
579	+	COLOR cr,
580	+	AMBVAL *ap,
581	+	FVECT pv,
582	+	FVECT nv,
583	+	FVECT uvw[3]
584	+	)
585	+	{
586	+	const double min_d = 0.05;
587	+	static FVECT my_uvw[3];
588	+	FVECT v1;
589	+	int i;
590	+	double d = 1.0; /* zeroeth order */
591	+
592	+	if (uvw == NULL) { /* need local coordinates? */
593	+	decodedir(my_uvw[2], ap->ndir);
594	+	decodedir(my_uvw[0], ap->udir);
595	+	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
596	+	uvw = my_uvw;
597	+	}
598	+	for (i = 3; i--; ) /* gradient due to translation */
599	+	d += (pv[i] - ap->pos[i]) *
600	+	(ap->gpos[0]uvw[0][i] + ap->gpos[1]uvw[1][i]);
601	+
602	+	VCROSS(v1, uvw[2], nv); /* gradient due to rotation */
603	+	for (i = 3; i--; )
604	+	d += v1[i] * (ap->gdir[0]uvw[0][i] + ap->gdir[1]uvw[1][i]);
605	+
606	+	if (d < min_d) /* should not use if we can avoid it */
607	+	d = min_d;
608	+	copycolor(cr, ap->val);
609	+	scalecolor(cr, d);
610	+	return(d > min_d);
611	+	}
612	+
613	+
614	+	static void
615	+	avinsert( /* insert ambient value in our tree */
616	+	AMBVAL *av
617	+	)
618	+	{
619	+	AMBTREE *at;
620	+	AMBVAL *ap;
621	+	AMBVAL avh;
622	+	FVECT ck0;
623	+	double s;
624	+	int branch;
625	+	int i;
626	+
627	+	if (av->rad[0] <= FTINY)
628	+	error(CONSISTENCY, "zero ambient radius in avinsert");
629	+	at = &atrunk;
630	+	VCOPY(ck0, thescene.cuorg);
631	+	s = thescene.cusize;
632	+	while (s(OCTSCALE/2) > av->rad[1]ambacc) {
633	+	if (at->kid == NULL)
634	+	if ((at->kid = newambtree()) == NULL)
635	+	error(SYSTEM, "out of memory in avinsert");
636	+	s *= 0.5;
637	+	branch = 0;
638	+	for (i = 0; i < 3; i++)
639	+	if (av->pos[i] > ck0[i] + s) {
640	+	ck0[i] += s;
641	+	branch \|= 1 << i;
642	+	}
643	+	at = at->kid + branch;
644	+	}
645	+	avh.next = at->alist; /* order by increasing level */
646	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
647	+	if ( ap->next->lvl > av->lvl \|\|
648	+	(ap->next->lvl == av->lvl) &
649	+	(ap->next->weight <= av->weight) )
650	+	break;
651	+	av->next = ap->next;
652	+	ap->next = (AMBVAL*)av;
653	+	at->alist = avh.next;
654	+	}
655	+
656	+
657	+	#else /* ! NEWAMB */
658	+
659	+	static double sumambient(COLOR acol, RAY *r, FVECT rn, int al,
660	+	AMBTREE *at, FVECT c0, double s);
661	+	static double makeambient(COLOR acol, RAY *r, FVECT rn, int al);
662	+	static void extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
663	+
664	+
665	+	void
666	+	multambient( /* compute ambient component & multiply by coef. */
667	+	COLOR aval,
668	+	RAY *r,
669	+	FVECT nrm
670	+	)
671	+	{
672	+	static int rdepth = 0; /* ambient recursion */
673	+	COLOR acol, caustic;
674	+	double d, l;
675	+
676	+	/* PMAP: Factor in ambient from global photon map (if enabled) and return
677	+	* as all ambient components accounted for */
678	+	if (ambPmap(aval, r, rdepth))
679	+	return;
680	+
681	+	/* PMAP: Otherwise factor in ambient from caustic photon map
682	+	* (ambPmapCaustic() returns zero if caustic photons disabled) and
683	+	* continue with RADIANCE ambient calculation */
684	+	copycolor(caustic, aval);
685	+	ambPmapCaustic(caustic, r, rdepth);
686	+
687	+	if (ambdiv <= 0) /* no ambient calculation */
688	+	goto dumbamb;
689	+	/* check number of bounces */
690	+	if (rdepth >= ambounce)
691	+	goto dumbamb;
692	+	/* check ambient list */
693	+	if (ambincl != -1 && r->ro != NULL &&
694	+	ambincl != inset(ambset, r->ro->omod))
695	+	goto dumbamb;
696	+
697	+	if (ambacc <= FTINY) { /* no ambient storage */
698	+	copycolor(acol, aval);
699	+	rdepth++;
700		d = doambient(acol, r, r->rweight, NULL, NULL);
701		rdepth--;
702		if (d <= FTINY)
703		goto dumbamb;
704	+	copycolor(aval, acol);
705	+
706	+	/* PMAP: add in caustic */
707	+	addcolor(aval, caustic);
708		return;
709		}
710
711		if (tracktime) /* sort to minimize thrashing */
712		sortambvals(0);
713	<	/* get ambient value */
713	>	/* interpolate ambient value */
714		setcolor(acol, 0.0, 0.0, 0.0);
715		d = sumambient(acol, r, nrm, rdepth,
716		&atrunk, thescene.cuorg, thescene.cusize);
717	+
718		if (d > FTINY) {
719	<	scalecolor(acol, 1.0/d);
719	>	d = 1.0/d;
720	>	scalecolor(acol, d);
721	>	multcolor(aval, acol);
722	>
723	>	/* PMAP: add in caustic */
724	>	addcolor(aval, caustic);
725		return;
726		}
727	+
728		rdepth++; /* need to cache new value */
729		d = makeambient(acol, r, nrm, rdepth-1);
730		rdepth--;
731	<	if (d > FTINY)
731	>
732	>	if (d > FTINY) {
733	>	multcolor(aval, acol); /* got new value */
734	>
735	>	/* PMAP: add in caustic */
736	>	addcolor(aval, caustic);
737		return;
738	+	}
739	+
740		dumbamb: /* return global value */
741	<	copycolor(acol, ambval);
742	<	if (ambvwt <= 0 \| navsum == 0)
741	>	if ((ambvwt <= 0) \| (navsum == 0)) {
742	>	multcolor(aval, ambval);
743	>
744	>	/* PMAP: add in caustic */
745	>	addcolor(aval, caustic);
746		return;
747	+	}
748	+
749		l = bright(ambval); /* average in computations */
750		if (l > FTINY) {
751		d = (log(l)*(double)ambvwt + avsum) /
752		(double)(ambvwt + navsum);
753		d = exp(d) / l;
754	<	scalecolor(acol, d); /* apply color of ambval */
754	>	scalecolor(aval, d);
755	>	multcolor(aval, ambval); /* apply color of ambval */
756		} else {
757		d = exp( avsum / (double)navsum );
758	<	setcolor(acol, d, d, d); /* neutral color */
758	>	scalecolor(aval, d); /* neutral color */
759		}
760		}
761
762
763	<	double
764	<	sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */
765	<	COLOR acol;
766	<	register RAY *r;
767	<	FVECT rn;
768	<	int al;
769	<	AMBTREE *at;
770	<	FVECT c0;
771	<	double s;
763	>	static double
764	>	sumambient( /* get interpolated ambient value */
765	>	COLOR acol,
766	>	RAY *r,
767	>	FVECT rn,
768	>	int al,
769	>	AMBTREE *at,
770	>	FVECT c0,
771	>	double s
772	>	)
773		{
774		double d, e1, e2, wt, wsum;
775		COLOR ct;
776		FVECT ck0;
777		int i;
778	<	register int j;
779	<	register AMBVAL *av;
778	>	int j;
779	>	AMBVAL *av;
780
781		wsum = 0.0;
782		/* do this node */
#	Line 321 \| Line 787 \| double s;
787		/*
788		* Ambient level test.
789		*/
790	<	if (av->lvl > al) /* list sorted, so this works */
790	>	if (av->lvl > al \|\| /* list sorted, so this works */
791	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
792		break;
326	–	if (av->weight < r->rweight-FTINY)
327	–	continue;
793		/*
794		* Ambient radius test.
795		*/
796	<	d = av->pos[0] - r->rop[0];
797	<	e1 = d * d;
333	<	d = av->pos[1] - r->rop[1];
334	<	e1 += d * d;
335	<	d = av->pos[2] - r->rop[2];
336	<	e1 += d * d;
337	<	e1 /= av->rad * av->rad;
796	>	VSUB(ck0, av->pos, r->rop);
797	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
798		if (e1 > ambaccambacc1.21)
799		continue;
800		/*
#	Line 351 \| Line 811 \| double s;
811		}
812		}
813		e2 = (1.0 - d) * r->rweight;
814	<	if (e2 < 0.0) e2 = 0.0;
815	<	if (e1 + e2 > ambaccambacc1.21)
814	>	if (e2 < 0.0)
815	>	e2 = 0.0;
816	>	else if (e1 + e2 > ambaccambacc1.21)
817		continue;
818		/*
819		* Ray behind test.
#	Line 402 \| Line 863 \| double s;
863		break;
864		}
865		if (j == 3)
866	<	wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s);
866	>	wsum += sumambient(acol, r, rn, al,
867	>	at->kid+i, ck0, s);
868		}
869		return(wsum);
870		}
871
872
873	<	double
874	<	makeambient(acol, r, rn, al) /* make a new ambient value */
875	<	COLOR acol;
876	<	register RAY *r;
877	<	FVECT rn;
878	<	int al;
873	>	static double
874	>	makeambient( /* make a new ambient value for storage */
875	>	COLOR acol,
876	>	RAY *r,
877	>	FVECT rn,
878	>	int al
879	>	)
880		{
881		AMBVAL amb;
882		FVECT gp, gd;
883	<	/* compute weight */
884	<	amb.weight = pow(AVGREFL, (double)al);
885	<	if (r->rweight < 0.1amb.weight) / heuristic */
886	<	amb.weight = r->rweight;
883	>	int i;
884	>
885	>	amb.weight = 1.0; /* compute weight */
886	>	for (i = al; i-- > 0; )
887	>	amb.weight *= AVGREFL;
888	>	if (r->rweight < 0.1amb.weight) / heuristic override */
889	>	amb.weight = 1.25*r->rweight;
890	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
891		/* compute ambient */
892		amb.rad = doambient(acol, r, amb.weight, gp, gd);
893	<	if (amb.rad <= FTINY)
893	>	if (amb.rad <= FTINY) {
894	>	setcolor(acol, 0.0, 0.0, 0.0);
895		return(0.0);
896	<	/* store it */
896	>	}
897	>	scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */
898	>	/* store value */
899		VCOPY(amb.pos, r->rop);
900		VCOPY(amb.dir, r->ron);
901		amb.lvl = al;
#	Line 440 \| Line 910 \| int al;
910		}
911
912
913	<	void
914	<	extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */
915	<	COLOR cr;
916	<	register AMBVAL *ap;
917	<	FVECT pv, nv;
913	>	static void
914	>	extambient( /* extrapolate value at pv, nv */
915	>	COLOR cr,
916	>	AMBVAL *ap,
917	>	FVECT pv,
918	>	FVECT nv
919	>	)
920		{
921		FVECT v1;
922	<	register int i;
922	>	int i;
923		double d;
924
925		d = 1.0; /* zeroeth order */
#	Line 467 \| Line 939 \| FVECT pv, nv;
939
940
941		static void
942	<	initambfile(creat) /* initialize ambient file */
943	<	int creat;
942	>	avinsert( /* insert ambient value in our tree */
943	>	AMBVAL *av
944	>	)
945		{
946	+	AMBTREE *at;
947	+	AMBVAL *ap;
948	+	AMBVAL avh;
949	+	FVECT ck0;
950	+	double s;
951	+	int branch;
952	+	int i;
953	+
954	+	if (av->rad <= FTINY)
955	+	error(CONSISTENCY, "zero ambient radius in avinsert");
956	+	at = &atrunk;
957	+	VCOPY(ck0, thescene.cuorg);
958	+	s = thescene.cusize;
959	+	while (s(OCTSCALE/2) > av->radambacc) {
960	+	if (at->kid == NULL)
961	+	if ((at->kid = newambtree()) == NULL)
962	+	error(SYSTEM, "out of memory in avinsert");
963	+	s *= 0.5;
964	+	branch = 0;
965	+	for (i = 0; i < 3; i++)
966	+	if (av->pos[i] > ck0[i] + s) {
967	+	ck0[i] += s;
968	+	branch \|= 1 << i;
969	+	}
970	+	at = at->kid + branch;
971	+	}
972	+	avh.next = at->alist; /* order by increasing level */
973	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
974	+	if ( ap->next->lvl > av->lvl \|\|
975	+	(ap->next->lvl == av->lvl) &
976	+	(ap->next->weight <= av->weight) )
977	+	break;
978	+	av->next = ap->next;
979	+	ap->next = (AMBVAL*)av;
980	+	at->alist = avh.next;
981	+	}
982	+
983	+	#endif /* ! NEWAMB */
984	+
985	+	/*********** FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS *************/
986	+
987	+	static void
988	+	initambfile( /* initialize ambient file */
989	+	int cre8
990	+	)
991	+	{
992		extern char progname, octname;
993		static char *mybuf = NULL;
994
995		#ifdef F_SETLKW
996	<	aflock(creat ? F_WRLCK : F_RDLCK);
996	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
997		#endif
998		SET_FILE_BINARY(ambfp);
999		if (mybuf == NULL)
1000		mybuf = (char *)bmalloc(BUFSIZ+8);
1001		setbuf(ambfp, mybuf);
1002	<	if (creat) { /* new file */
1002	>	if (cre8) { /* new file */
1003		newheader("RADIANCE", ambfp);
1004		fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
1005		progname, colval(ambval,RED),
#	Line 489 \| Line 1008 \| int creat;
1008		fprintf(ambfp, "-ad %d -as %d -ar %d ",
1009		ambdiv, ambssamp, ambres);
1010		if (octname != NULL)
1011	<	printargs(1, &octname, ambfp);
1012	<	else
494	<	fputc('\n', ambfp);
1011	>	fputs(octname, ambfp);
1012	>	fputc('\n', ambfp);
1013		fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1014		fputnow(ambfp);
1015		fputformat(AMBFMT, ambfp);
1016	<	putc('\n', ambfp);
1016	>	fputc('\n', ambfp);
1017		putambmagic(ambfp);
1018		} else if (checkheader(ambfp, AMBFMT, NULL) < 0 \|\| !hasambmagic(ambfp))
1019		error(USER, "bad ambient file");
#	Line 503 \| Line 1021 \| int creat;
1021
1022
1023		static void
1024	<	avsave(av) /* insert and save an ambient value */
1025	<	AMBVAL *av;
1024	>	avsave( /* insert and save an ambient value */
1025	>	AMBVAL *av
1026	>	)
1027		{
1028	<	avinsert(avstore(av));
1028	>	avstore(av);
1029		if (ambfp == NULL)
1030		return;
1031		if (writambval(av, ambfp) < 0)
#	Line 521 \| Line 1040 \| writerr:
1040
1041
1042		static AMBVAL *
1043	<	avstore(aval) /* allocate memory and store aval */
1044	<	register AMBVAL *aval;
1043	>	avstore( /* allocate memory and save aval */
1044	>	AMBVAL *aval
1045	>	)
1046		{
1047	<	register AMBVAL *av;
1047	>	AMBVAL *av;
1048		double d;
1049
1050		if ((av = newambval()) == NULL)
#	Line 538 \| Line 1058 \| *register AMBVAL aval;**
1058		avsum += log(d);
1059		navsum++;
1060		}
1061	+	avinsert(av); /* insert in our cache tree */
1062		return(av);
1063		}
1064
#	Line 548 \| Line 1069 \| *static AMBTREE atfreelist = NULL; /* free ambient tr**
1069
1070
1071		static AMBTREE *
1072	<	newambtree() /* allocate 8 ambient tree structs */
1072	>	newambtree(void) /* allocate 8 ambient tree structs */
1073		{
1074	<	register AMBTREE atp, upperlim;
1074	>	AMBTREE atp, upperlim;
1075
1076		if (atfreelist == NULL) { /* get more nodes */
1077		atfreelist = (AMBTREE )malloc(ATALLOCSZ8*sizeof(AMBTREE));
#	Line 564 \| Line 1085 \| *newambtree() / allocate 8 ambient tree structs /*
1085		}
1086		atp = atfreelist;
1087		atfreelist = atp->kid;
1088	<	memset((char )atp, '\0', 8sizeof(AMBTREE));
1088	>	memset(atp, 0, 8*sizeof(AMBTREE));
1089		return(atp);
1090		}
1091
1092
1093		static void
1094	<	freeambtree(atp) /* free 8 ambient tree structs */
1095	<	AMBTREE *atp;
1094	>	freeambtree( /* free 8 ambient tree structs */
1095	>	AMBTREE *atp
1096	>	)
1097		{
1098		atp->kid = atfreelist;
1099		atfreelist = atp;
#	Line 579 \| Line 1101 \| *AMBTREE atp;**
1101
1102
1103		static void
1104	<	avinsert(av) /* insert ambient value in our tree */
1105	<	register AMBVAL *av;
1104	>	unloadatree( /* unload an ambient value tree */
1105	>	AMBTREE *at,
1106	>	unloadtf_t *f
1107	>	)
1108		{
1109	<	register AMBTREE *at;
1110	<	register AMBVAL *ap;
587	<	AMBVAL avh;
588	<	FVECT ck0;
589	<	double s;
590	<	int branch;
591	<	register int i;
592	<
593	<	if (av->rad <= FTINY)
594	<	error(CONSISTENCY, "zero ambient radius in avinsert");
595	<	at = &atrunk;
596	<	VCOPY(ck0, thescene.cuorg);
597	<	s = thescene.cusize;
598	<	while (s(OCTSCALE/2) > av->radambacc) {
599	<	if (at->kid == NULL)
600	<	if ((at->kid = newambtree()) == NULL)
601	<	error(SYSTEM, "out of memory in avinsert");
602	<	s *= 0.5;
603	<	branch = 0;
604	<	for (i = 0; i < 3; i++)
605	<	if (av->pos[i] > ck0[i] + s) {
606	<	ck0[i] += s;
607	<	branch \|= 1 << i;
608	<	}
609	<	at = at->kid + branch;
610	<	}
611	<	avh.next = at->alist; /* order by increasing level */
612	<	for (ap = &avh; ap->next != NULL; ap = ap->next)
613	<	if (ap->next->lvl >= av->lvl)
614	<	break;
615	<	av->next = ap->next;
616	<	ap->next = av;
617	<	at->alist = avh.next;
618	<	}
619	<
620	<
621	<	static void
622	<	unloadatree(at, f) /* unload an ambient value tree */
623	<	register AMBTREE *at;
624	<	void (*f)();
625	<	{
626	<	register AMBVAL *av;
627	<	register int i;
1109	>	AMBVAL *av;
1110	>	int i;
1111		/* transfer values at this node */
1112		for (av = at->alist; av != NULL; av = at->alist) {
1113		at->alist = av->next;
1114	+	av->next = NULL;
1115		(*f)(av);
1116		}
1117		if (at->kid == NULL)
#	Line 646 \| Line 1130 \| static struct avl {
1130		static AMBVAL *avlist2; / memory positions for sorting */
1131		static int i_avlist; /* index for lists */
1132
1133	+	static int alatcmp(const void av1, const void av2);
1134
1135	<	static int
1136	<	av2list(av)
652	<	register AMBVAL *av;
1135	>	static void
1136	>	avfree(AMBVAL *av)
1137		{
1138	+	free(av);
1139	+	}
1140	+
1141	+	static void
1142	+	av2list(
1143	+	AMBVAL *av
1144	+	)
1145	+	{
1146		#ifdef DEBUG
1147		if (i_avlist >= nambvals)
1148		error(CONSISTENCY, "too many ambient values in av2list1");
1149		#endif
1150	<	avlist1[i_avlist].p = avlist2[i_avlist] = av;
1150	>	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1151		avlist1[i_avlist++].t = av->latick;
1152		}
1153
1154
1155		static int
1156	<	alatcmp(av1, av2) /* compare ambient values for MRA */
1157	<	struct avl av1, av2;
1156	>	alatcmp( /* compare ambient values for MRA */
1157	>	const void *av1,
1158	>	const void *av2
1159	>	)
1160		{
1161	<	register long lc = av2->t - av1->t;
1161	>	long lc = ((struct avl )av2)->t - ((struct avl )av1)->t;
1162		return(lc<0 ? -1 : lc>0 ? 1 : 0);
1163		}
1164
#	Line 676 \| Line 1170 \| *struct avl av1, av2;*
1170		* assumes pointers differ by exact struct size increments.
1171		*/
1172		static int
1173	<	aposcmp(avp1, avp2) /* compare ambient value positions */
1174	<	const void avp1, avp2;
1173	>	aposcmp( /* compare ambient value positions */
1174	>	const void *avp1,
1175	>	const void *avp2
1176	>	)
1177		{
1178	<	register long diff = (char const )avp1 - (char * const *)avp2;
1178	>	long diff = (char const )avp1 - (char * const *)avp2;
1179		if (diff < 0)
1180		return(-1);
1181		return(diff > 0);
1182		}
1183
1184	<	#if 1
1184	>
1185		static int
1186	<	avlmemi(avaddr) /* find list position from address */
1187	<	AMBVAL *avaddr;
1186	>	avlmemi( /* find list position from address */
1187	>	AMBVAL *avaddr
1188	>	)
1189		{
1190	<	register AMBVAL **avlpp;
1190	>	AMBVAL **avlpp;
1191
1192	<	avlpp = (AMBVAL *)bsearch((char )&avaddr, (char *)avlist2,
1192	>	avlpp = (AMBVAL **)bsearch(&avaddr, avlist2,
1193		nambvals, sizeof(AMBVAL *), aposcmp);
1194		if (avlpp == NULL)
1195		error(CONSISTENCY, "address not found in avlmemi");
1196		return(avlpp - avlist2);
1197		}
701	–	#else
702	–	#define avlmemi(avaddr) ((AMBVAL *)bsearch((char )&avaddr,(char *)avlist2, \
703	–	nambvals,sizeof(AMBVAL *),aposcmp) - avlist2)
704	–	#endif
1198
1199
1200		static void
1201	<	sortambvals(always) /* resort ambient values */
1202	<	int always;
1201	>	sortambvals( /* resort ambient values */
1202	>	int always
1203	>	)
1204		{
1205		AMBTREE oldatrunk;
1206		AMBVAL tav, tap, pnext;
1207	<	register int i, j;
1207	>	int i, j;
1208		/* see if it's time yet */
1209		if (!always && (ambclock++ < lastsort+sortintvl \|\|
1210		nambvals < SORT_THRESH))
#	Line 739 \| Line 1233 \| int always;
1233		}
1234		if (avlist1 == NULL) { /* no time tracking -- rebuild tree? */
1235		if (avlist2 != NULL)
1236	<	free((void *)avlist2);
1236	>	free(avlist2);
1237		if (always) { /* rebuild without sorting */
1238		oldatrunk = atrunk;
1239		atrunk.alist = NULL;
#	Line 766 \| Line 1260 \| int always;
1260		if (i_avlist < nambvals)
1261		error(CONSISTENCY, "missing ambient values in sortambvals");
1262		#endif
1263	<	qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp);
1264	<	qsort((char )avlist2, nambvals, sizeof(AMBVAL ), aposcmp);
1263	>	qsort(avlist1, nambvals, sizeof(struct avl), alatcmp);
1264	>	qsort(avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1265		for (i = 0; i < nambvals; i++) {
1266		if (avlist1[i].p == NULL)
1267		continue;
#	Line 783 \| Line 1277 \| int always;
1277		avinsert(avlist2[j]);
1278		avlist1[j].p = NULL;
1279		}
1280	<	free((void *)avlist1);
1281	<	free((void *)avlist2);
1280	>	free(avlist1);
1281	>	free(avlist2);
1282		/* compute new sort interval */
1283		sortintvl = ambclock - lastsort;
1284		if (sortintvl >= MAX_SORT_INTVL/2)
#	Line 804 \| Line 1298 \| int always;
1298		#ifdef F_SETLKW
1299
1300		static void
1301	<	aflock(typ) /* lock/unlock ambient file */
1302	<	int typ;
1301	>	aflock( /* lock/unlock ambient file */
1302	>	int typ
1303	>	)
1304		{
1305		static struct flock fls; /* static so initialized to zeroes */
1306
1307	+	if (typ == fls.l_type) /* already called? */
1308	+	return;
1309		fls.l_type = typ;
1310		if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1311		error(SYSTEM, "cannot (un)lock ambient file");
#	Line 816 \| Line 1313 \| int typ;
1313
1314
1315		int
1316	<	ambsync() /* synchronize ambient file */
1316	>	ambsync(void) /* synchronize ambient file */
1317		{
1318		long flen;
1319		AMBVAL avs;
1320	<	register int n;
1320	>	int n;
1321
1322	<	if (nunflshed == 0)
1322	>	if (ambfp == NULL) /* no ambient file? */
1323		return(0);
1324	<	if (lastpos < 0) /* initializing (locked in initambfile) */
1325	<	goto syncend;
829	<	/* gain exclusive access */
830	<	aflock(F_WRLCK);
1324	>	/* gain appropriate access */
1325	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1326		/* see if file has grown */
1327	<	if ((flen = lseek(fileno(ambfp), (off_t)0L, 2)) < 0)
1327	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1328		goto seekerr;
1329	<	if (n = flen - lastpos) { /* file has grown */
1329	>	if ((n = flen - lastpos) > 0) { /* file has grown */
1330		if (ambinp == NULL) { /* use duplicate filedes */
1331		ambinp = fdopen(dup(fileno(ambfp)), "r");
1332		if (ambinp == NULL)
1333		error(SYSTEM, "fdopen failed in ambsync");
1334		}
1335	<	if (fseek(ambinp, lastpos, 0) < 0)
1335	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1336		goto seekerr;
1337		while (n >= AMBVALSIZ) { /* load contributed values */
1338		if (!readambval(&avs, ambinp)) {
#	Line 847 \| Line 1342 \| *ambsync() / synchronize ambient file /*
1342		error(WARNING, errmsg);
1343		break;
1344		}
1345	<	avinsert(avstore(&avs));
1345	>	avstore(&avs);
1346		n -= AMBVALSIZ;
1347		}
1348	+	lastpos = flen - n;
1349		/*** seek always as safety measure
1350		if (n) **/ / alignment */
1351	<	if (lseek(fileno(ambfp), (off_t)(flen-n), 0) < 0)
1351	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1352		goto seekerr;
1353		}
858	–	#ifdef DEBUG
859	–	if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) {
860	–	sprintf(errmsg, "ambient file buffer at %d rather than %d",
861	–	ambfp->_ptr - ambfp->_base,
862	–	nunflshed*AMBVALSIZ);
863	–	error(CONSISTENCY, errmsg);
864	–	}
865	–	#endif
866	–	syncend:
1354		n = fflush(ambfp); /* calls write() at last */
1355	<	if ((lastpos = lseek(fileno(ambfp), (off_t)0L, 1)) < 0)
1355	>	if (n != EOF)
1356	>	lastpos += (long)nunflshed*AMBVALSIZ;
1357	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1358		goto seekerr;
1359	+
1360		aflock(F_UNLCK); /* release file */
1361		nunflshed = 0;
1362		return(n);
1363		seekerr:
1364		error(SYSTEM, "seek failed in ambsync");
1365	+	return -1; /* pro forma return */
1366		}
1367
1368	<	#else
1368	>	#else /* ! F_SETLKW */
1369
1370		int
1371	<	ambsync() /* flush ambient file */
1371	>	ambsync(void) /* flush ambient file */
1372		{
1373	<	if (nunflshed == 0)
1373	>	if (ambfp == NULL)
1374		return(0);
1375		nunflshed = 0;
1376		return(fflush(ambfp));
1377		}
1378
1379	<	#endif
1379	>	#endif /* ! F_SETLKW */

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Comparing ray/src/rt/ambient.c (file contents): Revision 2.53 by schorsch, Mon Jul 21 22:30:19 2003 UTC vs. Revision 2.103 by greg, Tue Nov 1 20:39:39 2016 UTC

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Comparing ray/src/rt/ambient.c (file contents):
Revision 2.53 by schorsch, Mon Jul 21 22:30:19 2003 UTC vs.
Revision 2.103 by greg, Tue Nov 1 20:39:39 2016 UTC