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

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.50 by schorsch, Thu Jun 5 19:29:34 2003 UTC vs.
Revision 2.100 by greg, Thu Mar 3 22:47:21 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 9 \| Line 7 \| static const char RCSid[] = "$Id$";
7
8		#include "copyright.h"
9
10	+	#include <string.h>
11	+
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 21 \| 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 34 \| 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 46 \| 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 78 \| *static long lastpos = -1; / last flush position /*
78		#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL))
79		#define freeav(av) free((void *)av);
80
81	<	static void initambfile(), avsave(), avinsert(), sortambvals(), unloadatree();
82	<	static int avlmemi();
83	<	static AMBVAL *avstore();
81	>	static void initambfile(int creat);
82	>	static void avsave(AMBVAL *av);
83	>	static AMBVAL avstore(AMBVAL aval);
84	>	static AMBTREE *newambtree(void);
85	>	static void freeambtree(AMBTREE *atp);
86	>
87	>	typedef void unloadtf_t(AMBVAL *);
88	>	static unloadtf_t avinsert;
89	>	static unloadtf_t av2list;
90	>	static unloadtf_t avfree;
91	>	static void unloadatree(AMBTREE at, unloadtf_t f);
92	>
93	>	static int aposcmp(const void avp1, const void avp2);
94	>	static int avlmemi(AMBVAL *avaddr);
95	>	static void sortambvals(int always);
96	>
97		#ifdef F_SETLKW
98	<	static void aflock();
98	>	static void aflock(int typ);
99		#endif
100
101
102		void
103	<	setambres(ar) /* set ambient resolution */
104	<	int ar;
103	>	setambres( /* set ambient resolution */
104	>	int ar
105	>	)
106		{
107		ambres = ar < 0 ? 0 : ar; /* may be done already */
108		/* set min & max radii */
109		if (ar <= 0) {
110		minarad = 0;
111	<	maxarad = thescene.cusize / 2.0;
111	>	maxarad = thescene.cusize*0.2;
112		} else {
113		minarad = thescene.cusize / ar;
114	<	maxarad = 64 * minarad; /* heuristic */
115	<	if (maxarad > thescene.cusize / 2.0)
116	<	maxarad = thescene.cusize / 2.0;
114	>	maxarad = 64.0 * minarad; /* heuristic */
115	>	if (maxarad > thescene.cusize*0.2)
116	>	maxarad = thescene.cusize*0.2;
117		}
118		if (minarad <= FTINY)
119	<	minarad = 10*FTINY;
119	>	minarad = 10.0*FTINY;
120		if (maxarad <= minarad)
121	<	maxarad = 64 * minarad;
121	>	maxarad = 64.0 * minarad;
122		}
123
124
125		void
126	<	setambacc(newa) /* set ambient accuracy */
127	<	double newa;
126	>	setambacc( /* set ambient accuracy */
127	>	double newa
128	>	)
129		{
130	<	double ambdiff;
131	<
132	<	if (newa < 0.0)
133	<	newa = 0.0;
134	<	ambdiff = fabs(newa - ambacc);
135	<	if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0)
136	<	sortambvals(1); /* rebuild tree */
130	>	static double olda; /* remember previous setting here */
131	>
132	>	newa *= (newa > 0);
133	>	if (fabs(newa - olda) >= .05*(newa + olda)) {
134	>	ambacc = newa;
135	>	if (nambvals > 0)
136	>	sortambvals(1); /* rebuild tree */
137	>	}
138		}
139
140
141		void
142	<	setambient() /* initialize calculation */
142	>	setambient(void) /* initialize calculation */
143		{
144		int readonly = 0;
145	<	long pos, flen;
145	>	long flen;
146		AMBVAL amb;
147		/* make sure we're fresh */
148		ambdone();
#	Line 141 \| Line 162 \| *setambient() / initialize calculation /*
162		readonly = (ambfp = fopen(ambfile, "r")) != NULL;
163		if (ambfp != NULL) {
164		initambfile(0); /* file exists */
165	<	pos = ftell(ambfp);
165	>	lastpos = ftell(ambfp);
166		while (readambval(&amb, ambfp))
167	<	avinsert(avstore(&amb));
167	>	avstore(&amb);
168		nambshare = nambvals; /* share loaded values */
169		if (readonly) {
170		sprintf(errmsg,
#	Line 155 \| Line 176 \| *setambient() / initialize calculation /*
176		return; /* avoid ambsync() */
177		}
178		/* align file pointer */
179	<	pos += (long)nambvals*AMBVALSIZ;
180	<	flen = lseek(fileno(ambfp), (off_t)0L, 2);
181	<	if (flen != pos) {
179	>	lastpos += (long)nambvals*AMBVALSIZ;
180	>	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
181	>	if (flen != lastpos) {
182		sprintf(errmsg,
183		"ignoring last %ld values in ambient file (corrupted)",
184	<	(flen - pos)/AMBVALSIZ);
184	>	(flen - lastpos)/AMBVALSIZ);
185		error(WARNING, errmsg);
186	<	fseek(ambfp, pos, 0);
187	<	ftruncate(fileno(ambfp), (off_t)pos);
186	>	fseek(ambfp, lastpos, SEEK_SET);
187	>	#ifndef _WIN32 /* XXX we need a replacement for that one */
188	>	ftruncate(fileno(ambfp), (off_t)lastpos);
189	>	#endif
190		}
191		} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
192		initambfile(1); /* else create new file */
193	+	fflush(ambfp);
194	+	lastpos = ftell(ambfp);
195		} else {
196		sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
197		error(SYSTEM, errmsg);
198		}
199	<	nunflshed++; /* lie */
200	<	ambsync();
199	>	#ifdef F_SETLKW
200	>	aflock(F_UNLCK); /* release file */
201	>	#endif
202		}
203
204
205		void
206	<	ambdone() /* close ambient file and free memory */
206	>	ambdone(void) /* close ambient file and free memory */
207		{
208		if (ambfp != NULL) { /* close ambient file */
209		ambsync();
#	Line 190 \| Line 216 \| *ambdone() / close ambient file and free memory /*
216		lastpos = -1;
217		}
218		/* free ambient tree */
219	<	unloadatree(&atrunk, free);
219	>	unloadatree(&atrunk, avfree);
220		/* reset state variables */
221		avsum = 0.;
222		navsum = 0;
#	Line 203 \| Line 229 \| *ambdone() / close ambient file and free memory /*
229
230
231		void
232	<	ambnotify(obj) /* record new modifier */
233	<	OBJECT obj;
232	>	ambnotify( /* record new modifier */
233	>	OBJECT obj
234	>	)
235		{
236		static int hitlimit = 0;
237	<	register OBJREC *o;
238	<	register char **amblp;
237	>	OBJREC *o;
238	>	char **amblp;
239
240		if (obj == OVOID) { /* starting over */
241		ambset[0] = 0;
#	Line 230 \| Line 257 \| OBJECT obj;
257		}
258		}
259
260	+	/********** THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD *************/
261
262	+	#ifndef OLDAMB
263	+
264	+	#define tfunc(lwr, x, upr) (((x)-(lwr))/((upr)-(lwr)))
265	+
266	+	static int plugaleak(RAY r, AMBVAL ap, FVECT anorm, double ang);
267	+	static double sumambient(COLOR acol, RAY *r, FVECT rn, int al,
268	+	AMBTREE *at, FVECT c0, double s);
269	+	static int makeambient(COLOR acol, RAY *r, FVECT rn, int al);
270	+	static int extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
271	+	FVECT uvw[3]);
272	+
273		void
274	<	ambient(acol, r, nrm) /* compute ambient component for ray */
275	<	COLOR acol;
276	<	register RAY *r;
277	<	FVECT nrm;
274	>	multambient( /* compute ambient component & multiply by coef. */
275	>	COLOR aval,
276	>	RAY *r,
277	>	FVECT nrm
278	>	)
279		{
280		static int rdepth = 0; /* ambient recursion */
281	+	COLOR acol, caustic;
282	+	int ok;
283		double d, l;
284
285	+	/* PMAP: Factor in ambient from photon map, if enabled and ray is
286	+	* ambient. Return as all ambient components accounted for, else
287	+	* continue. */
288	+	if (ambPmap(aval, r, rdepth))
289	+	return;
290	+
291	+	/* PMAP: Factor in specular-diffuse ambient (caustics) from photon
292	+	* map, if enabled and ray is primary, else caustic is zero. Continue
293	+	* with RADIANCE ambient calculation */
294	+	copycolor(caustic, aval);
295	+	ambPmapCaustic(caustic, r, rdepth);
296	+
297		if (ambdiv <= 0) /* no ambient calculation */
298		goto dumbamb;
299		/* check number of bounces */
#	Line 251 \| Line 305 \| FVECT nrm;
305		goto dumbamb;
306
307		if (ambacc <= FTINY) { /* no ambient storage */
308	+	copycolor(acol, aval);
309		rdepth++;
310	+	ok = doambient(acol, r, r->rweight,
311	+	NULL, NULL, NULL, NULL, NULL);
312	+	rdepth--;
313	+	if (!ok)
314	+	goto dumbamb;
315	+	copycolor(aval, acol);
316	+
317	+	/* PMAP: add in caustic */
318	+	addcolor(aval, caustic);
319	+	return;
320	+	}
321	+
322	+	if (tracktime) /* sort to minimize thrashing */
323	+	sortambvals(0);
324	+	/* interpolate ambient value */
325	+	setcolor(acol, 0.0, 0.0, 0.0);
326	+	d = sumambient(acol, r, nrm, rdepth,
327	+	&atrunk, thescene.cuorg, thescene.cusize);
328	+
329	+	if (d > FTINY) {
330	+	d = 1.0/d;
331	+	scalecolor(acol, d);
332	+	multcolor(aval, acol);
333	+
334	+	/* PMAP: add in caustic */
335	+	addcolor(aval, caustic);
336	+	return;
337	+	}
338	+
339	+	rdepth++; /* need to cache new value */
340	+	ok = makeambient(acol, r, nrm, rdepth-1);
341	+	rdepth--;
342	+
343	+	if (ok) {
344	+	multcolor(aval, acol); /* computed new value */
345	+
346	+	/* PMAP: add in caustic */
347	+	addcolor(aval, caustic);
348	+	return;
349	+	}
350	+
351	+	dumbamb: /* return global value */
352	+	if ((ambvwt <= 0) \| (navsum == 0)) {
353	+	multcolor(aval, ambval);
354	+
355	+	/* PMAP: add in caustic */
356	+	addcolor(aval, caustic);
357	+	return;
358	+	}
359	+
360	+	l = bright(ambval); /* average in computations */
361	+	if (l > FTINY) {
362	+	d = (log(l)*(double)ambvwt + avsum) /
363	+	(double)(ambvwt + navsum);
364	+	d = exp(d) / l;
365	+	scalecolor(aval, d);
366	+	multcolor(aval, ambval); /* apply color of ambval */
367	+	} else {
368	+	d = exp( avsum / (double)navsum );
369	+	scalecolor(aval, d); /* neutral color */
370	+	}
371	+	}
372	+
373	+
374	+	/* Plug a potential leak where ambient cache value is occluded */
375	+	static int
376	+	plugaleak(RAY r, AMBVAL ap, FVECT anorm, double ang)
377	+	{
378	+	const double cost70sq = 0.1169778; /* cos(70deg)^2 */
379	+	RAY rtst;
380	+	FVECT vdif;
381	+	double normdot, ndotd, nadotd;
382	+	double a, b, c, t[2];
383	+
384	+	ang += 2.PI(ang < 0); /* check direction flags */
385	+	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
386	+	return(0);
387	+	/*
388	+	* Generate test ray, targeting 20 degrees above sample point plane
389	+	* along surface normal from cache position. This should be high
390	+	* enough to miss local geometry we don't really care about.
391	+	*/
392	+	VSUB(vdif, ap->pos, r->rop);
393	+	normdot = DOT(anorm, r->ron);
394	+	ndotd = DOT(vdif, r->ron);
395	+	nadotd = DOT(vdif, anorm);
396	+	a = normdot*normdot - cost70sq;
397	+	b = 2.0(normdotndotd - nadotd*cost70sq);
398	+	c = ndotdndotd - DOT(vdif,vdif)cost70sq;
399	+	if (quadratic(t, a, b, c) != 2)
400	+	return(1); /* should rarely happen */
401	+	if (t[1] <= FTINY)
402	+	return(0); /* should fail behind test */
403	+	rayorigin(&rtst, SHADOW, r, NULL);
404	+	VSUM(rtst.rdir, vdif, anorm, t[1]); /* further dist. > plane */
405	+	rtst.rmax = normalize(rtst.rdir); /* short ray test */
406	+	while (localhit(&rtst, &thescene)) { /* check for occluder */
407	+	if (rtst.ro->omod != OVOID &&
408	+	(rtst.clipset == NULL \|\|
409	+	!inset(rtst.clipset, rtst.ro->omod)))
410	+	return(1); /* plug light leak */
411	+	VCOPY(rtst.rorg, rtst.rop); /* skip invisible surface */
412	+	rtst.rmax -= rtst.rot;
413	+	rayclear(&rtst);
414	+	}
415	+	return(0); /* seems we're OK */
416	+	}
417	+
418	+
419	+	static double
420	+	sumambient( /* get interpolated ambient value */
421	+	COLOR acol,
422	+	RAY *r,
423	+	FVECT rn,
424	+	int al,
425	+	AMBTREE *at,
426	+	FVECT c0,
427	+	double s
428	+	)
429	+	{ /* initial limit is 10 degrees plus ambacc radians */
430	+	const double minangle = 10.0 * PI/180.;
431	+	double maxangle = minangle + ambacc;
432	+	double wsum = 0.0;
433	+	FVECT ck0;
434	+	int i, j;
435	+	AMBVAL *av;
436	+
437	+	if (at->kid != NULL) { /* sum children first */
438	+	s *= 0.5;
439	+	for (i = 0; i < 8; i++) {
440	+	for (j = 0; j < 3; j++) {
441	+	ck0[j] = c0[j];
442	+	if (1<<j & i)
443	+	ck0[j] += s;
444	+	if (r->rop[j] < ck0[j] - OCTSCALE*s)
445	+	break;
446	+	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
447	+	break;
448	+	}
449	+	if (j == 3)
450	+	wsum += sumambient(acol, r, rn, al,
451	+	at->kid+i, ck0, s);
452	+	}
453	+	/* good enough? */
454	+	if (wsum >= 0.05 && s > minarad*10.0)
455	+	return(wsum);
456	+	}
457	+	/* adjust maximum angle */
458	+	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
459	+	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
460	+	/* sum this node */
461	+	for (av = at->alist; av != NULL; av = av->next) {
462	+	double u, v, d, delta_r2, delta_t2;
463	+	COLOR ct;
464	+	FVECT uvw[3];
465	+	/* record access */
466	+	if (tracktime)
467	+	av->latick = ambclock;
468	+	/*
469	+	* Ambient level test
470	+	*/
471	+	if (av->lvl > al \|\| /* list sorted, so this works */
472	+	(av->lvl == al) & (av->weight < 0.9*r->rweight))
473	+	break;
474	+	/*
475	+	* Direction test using unperturbed normal
476	+	*/
477	+	decodedir(uvw[2], av->ndir);
478	+	d = DOT(uvw[2], r->ron);
479	+	if (d <= 0.0) /* >= 90 degrees */
480	+	continue;
481	+	delta_r2 = 2.0 - 2.0d; / approx. radians^2 */
482	+	if (delta_r2 >= maxangle*maxangle)
483	+	continue;
484	+	/*
485	+	* Modified ray behind test
486	+	*/
487	+	VSUB(ck0, r->rop, av->pos);
488	+	d = DOT(ck0, uvw[2]);
489	+	if (d < -minarad*ambacc-.001)
490	+	continue;
491	+	d /= av->rad[0];
492	+	delta_t2 = d*d;
493	+	if (delta_t2 >= ambacc*ambacc)
494	+	continue;
495	+	/*
496	+	* Elliptical radii test based on Hessian
497	+	*/
498	+	decodedir(uvw[0], av->udir);
499	+	VCROSS(uvw[1], uvw[2], uvw[0]);
500	+	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
501	+	delta_t2 += d*d;
502	+	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
503	+	delta_t2 += d*d;
504	+	if (delta_t2 >= ambacc*ambacc)
505	+	continue;
506	+	/*
507	+	* Test for potential light leak
508	+	*/
509	+	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
510	+	continue;
511	+	/*
512	+	* Extrapolate value and compute final weight (hat function)
513	+	*/
514	+	if (!extambient(ct, av, r->rop, rn, uvw))
515	+	continue;
516	+	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
517	+	tfunc(ambacc, sqrt(delta_t2), 0.0);
518	+	scalecolor(ct, d);
519	+	addcolor(acol, ct);
520	+	wsum += d;
521	+	}
522	+	return(wsum);
523	+	}
524	+
525	+
526	+	static int
527	+	makeambient( /* make a new ambient value for storage */
528	+	COLOR acol,
529	+	RAY *r,
530	+	FVECT rn,
531	+	int al
532	+	)
533	+	{
534	+	AMBVAL amb;
535	+	FVECT uvw[3];
536	+	int i;
537	+
538	+	amb.weight = 1.0; /* compute weight */
539	+	for (i = al; i-- > 0; )
540	+	amb.weight *= AVGREFL;
541	+	if (r->rweight < 0.1amb.weight) / heuristic override */
542	+	amb.weight = 1.25*r->rweight;
543	+	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
544	+	/* compute ambient */
545	+	i = doambient(acol, r, amb.weight,
546	+	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
547	+	scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */
548	+	if (i <= 0 \|\| amb.rad[0] <= FTINY) /* no Hessian or zero radius */
549	+	return(i);
550	+	/* store value */
551	+	VCOPY(amb.pos, r->rop);
552	+	amb.ndir = encodedir(r->ron);
553	+	amb.udir = encodedir(uvw[0]);
554	+	amb.lvl = al;
555	+	copycolor(amb.val, acol);
556	+	/* insert into tree */
557	+	avsave(&amb); /* and save to file */
558	+	if (rn != r->ron) { /* texture */
559	+	VCOPY(uvw[2], r->ron);
560	+	extambient(acol, &amb, r->rop, rn, uvw);
561	+	}
562	+	return(1);
563	+	}
564	+
565	+
566	+	static int
567	+	extambient( /* extrapolate value at pv, nv */
568	+	COLOR cr,
569	+	AMBVAL *ap,
570	+	FVECT pv,
571	+	FVECT nv,
572	+	FVECT uvw[3]
573	+	)
574	+	{
575	+	const double min_d = 0.05;
576	+	static FVECT my_uvw[3];
577	+	FVECT v1;
578	+	int i;
579	+	double d = 1.0; /* zeroeth order */
580	+
581	+	if (uvw == NULL) { /* need local coordinates? */
582	+	decodedir(my_uvw[2], ap->ndir);
583	+	decodedir(my_uvw[0], ap->udir);
584	+	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
585	+	uvw = my_uvw;
586	+	}
587	+	for (i = 3; i--; ) /* gradient due to translation */
588	+	d += (pv[i] - ap->pos[i]) *
589	+	(ap->gpos[0]uvw[0][i] + ap->gpos[1]uvw[1][i]);
590	+
591	+	VCROSS(v1, uvw[2], nv); /* gradient due to rotation */
592	+	for (i = 3; i--; )
593	+	d += v1[i] * (ap->gdir[0]uvw[0][i] + ap->gdir[1]uvw[1][i]);
594	+
595	+	if (d < min_d) /* should not use if we can avoid it */
596	+	d = min_d;
597	+	copycolor(cr, ap->val);
598	+	scalecolor(cr, d);
599	+	return(d > min_d);
600	+	}
601	+
602	+
603	+	static void
604	+	avinsert( /* insert ambient value in our tree */
605	+	AMBVAL *av
606	+	)
607	+	{
608	+	AMBTREE *at;
609	+	AMBVAL *ap;
610	+	AMBVAL avh;
611	+	FVECT ck0;
612	+	double s;
613	+	int branch;
614	+	int i;
615	+
616	+	if (av->rad[0] <= FTINY)
617	+	error(CONSISTENCY, "zero ambient radius in avinsert");
618	+	at = &atrunk;
619	+	VCOPY(ck0, thescene.cuorg);
620	+	s = thescene.cusize;
621	+	while (s(OCTSCALE/2) > av->rad[1]ambacc) {
622	+	if (at->kid == NULL)
623	+	if ((at->kid = newambtree()) == NULL)
624	+	error(SYSTEM, "out of memory in avinsert");
625	+	s *= 0.5;
626	+	branch = 0;
627	+	for (i = 0; i < 3; i++)
628	+	if (av->pos[i] > ck0[i] + s) {
629	+	ck0[i] += s;
630	+	branch \|= 1 << i;
631	+	}
632	+	at = at->kid + branch;
633	+	}
634	+	avh.next = at->alist; /* order by increasing level */
635	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
636	+	if ( ap->next->lvl > av->lvl \|\|
637	+	(ap->next->lvl == av->lvl) &
638	+	(ap->next->weight <= av->weight) )
639	+	break;
640	+	av->next = ap->next;
641	+	ap->next = (AMBVAL*)av;
642	+	at->alist = avh.next;
643	+	}
644	+
645	+
646	+	#else /* ! NEWAMB */
647	+
648	+	static double sumambient(COLOR acol, RAY *r, FVECT rn, int al,
649	+	AMBTREE *at, FVECT c0, double s);
650	+	static double makeambient(COLOR acol, RAY *r, FVECT rn, int al);
651	+	static void extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
652	+
653	+
654	+	void
655	+	multambient( /* compute ambient component & multiply by coef. */
656	+	COLOR aval,
657	+	RAY *r,
658	+	FVECT nrm
659	+	)
660	+	{
661	+	static int rdepth = 0; /* ambient recursion */
662	+	COLOR acol, caustic;
663	+	double d, l;
664	+
665	+	/* PMAP: Factor in ambient from global photon map (if enabled) and return
666	+	* as all ambient components accounted for */
667	+	if (ambPmap(aval, r, rdepth))
668	+	return;
669	+
670	+	/* PMAP: Otherwise factor in ambient from caustic photon map
671	+	* (ambPmapCaustic() returns zero if caustic photons disabled) and
672	+	* continue with RADIANCE ambient calculation */
673	+	copycolor(caustic, aval);
674	+	ambPmapCaustic(caustic, r, rdepth);
675	+
676	+	if (ambdiv <= 0) /* no ambient calculation */
677	+	goto dumbamb;
678	+	/* check number of bounces */
679	+	if (rdepth >= ambounce)
680	+	goto dumbamb;
681	+	/* check ambient list */
682	+	if (ambincl != -1 && r->ro != NULL &&
683	+	ambincl != inset(ambset, r->ro->omod))
684	+	goto dumbamb;
685	+
686	+	if (ambacc <= FTINY) { /* no ambient storage */
687	+	copycolor(acol, aval);
688	+	rdepth++;
689		d = doambient(acol, r, r->rweight, NULL, NULL);
690		rdepth--;
691		if (d <= FTINY)
692		goto dumbamb;
693	+	copycolor(aval, acol);
694	+
695	+	/* PMAP: add in caustic */
696	+	addcolor(aval, caustic);
697		return;
698		}
699
700		if (tracktime) /* sort to minimize thrashing */
701		sortambvals(0);
702	<	/* get ambient value */
702	>	/* interpolate ambient value */
703		setcolor(acol, 0.0, 0.0, 0.0);
704		d = sumambient(acol, r, nrm, rdepth,
705		&atrunk, thescene.cuorg, thescene.cusize);
706	+
707		if (d > FTINY) {
708	<	scalecolor(acol, 1.0/d);
708	>	d = 1.0/d;
709	>	scalecolor(acol, d);
710	>	multcolor(aval, acol);
711	>
712	>	/* PMAP: add in caustic */
713	>	addcolor(aval, caustic);
714		return;
715		}
716	+
717		rdepth++; /* need to cache new value */
718		d = makeambient(acol, r, nrm, rdepth-1);
719		rdepth--;
720	<	if (d > FTINY)
720	>
721	>	if (d > FTINY) {
722	>	multcolor(aval, acol); /* got new value */
723	>
724	>	/* PMAP: add in caustic */
725	>	addcolor(aval, caustic);
726		return;
727	+	}
728	+
729		dumbamb: /* return global value */
730	<	copycolor(acol, ambval);
731	<	if (ambvwt <= 0 \| navsum == 0)
730	>	if ((ambvwt <= 0) \| (navsum == 0)) {
731	>	multcolor(aval, ambval);
732	>
733	>	/* PMAP: add in caustic */
734	>	addcolor(aval, caustic);
735		return;
736	+	}
737	+
738		l = bright(ambval); /* average in computations */
739		if (l > FTINY) {
740		d = (log(l)*(double)ambvwt + avsum) /
741		(double)(ambvwt + navsum);
742		d = exp(d) / l;
743	<	scalecolor(acol, d); /* apply color of ambval */
743	>	scalecolor(aval, d);
744	>	multcolor(aval, ambval); /* apply color of ambval */
745		} else {
746		d = exp( avsum / (double)navsum );
747	<	setcolor(acol, d, d, d); /* neutral color */
747	>	scalecolor(aval, d); /* neutral color */
748		}
749		}
750
751
752	<	double
753	<	sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */
754	<	COLOR acol;
755	<	register RAY *r;
756	<	FVECT rn;
757	<	int al;
758	<	AMBTREE *at;
759	<	FVECT c0;
760	<	double s;
752	>	static double
753	>	sumambient( /* get interpolated ambient value */
754	>	COLOR acol,
755	>	RAY *r,
756	>	FVECT rn,
757	>	int al,
758	>	AMBTREE *at,
759	>	FVECT c0,
760	>	double s
761	>	)
762		{
763		double d, e1, e2, wt, wsum;
764		COLOR ct;
765		FVECT ck0;
766		int i;
767	<	register int j;
768	<	register AMBVAL *av;
767	>	int j;
768	>	AMBVAL *av;
769
770		wsum = 0.0;
771		/* do this node */
#	Line 317 \| Line 776 \| double s;
776		/*
777		* Ambient level test.
778		*/
779	<	if (av->lvl > al) /* list sorted, so this works */
779	>	if (av->lvl > al \|\| /* list sorted, so this works */
780	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
781		break;
322	–	if (av->weight < r->rweight-FTINY)
323	–	continue;
782		/*
783		* Ambient radius test.
784		*/
785	<	d = av->pos[0] - r->rop[0];
786	<	e1 = d * d;
329	<	d = av->pos[1] - r->rop[1];
330	<	e1 += d * d;
331	<	d = av->pos[2] - r->rop[2];
332	<	e1 += d * d;
333	<	e1 /= av->rad * av->rad;
785	>	VSUB(ck0, av->pos, r->rop);
786	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
787		if (e1 > ambaccambacc1.21)
788		continue;
789		/*
#	Line 347 \| Line 800 \| double s;
800		}
801		}
802		e2 = (1.0 - d) * r->rweight;
803	<	if (e2 < 0.0) e2 = 0.0;
804	<	if (e1 + e2 > ambaccambacc1.21)
803	>	if (e2 < 0.0)
804	>	e2 = 0.0;
805	>	else if (e1 + e2 > ambaccambacc1.21)
806		continue;
807		/*
808		* Ray behind test.
#	Line 398 \| Line 852 \| double s;
852		break;
853		}
854		if (j == 3)
855	<	wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s);
855	>	wsum += sumambient(acol, r, rn, al,
856	>	at->kid+i, ck0, s);
857		}
858		return(wsum);
859		}
860
861
862	<	double
863	<	makeambient(acol, r, rn, al) /* make a new ambient value */
864	<	COLOR acol;
865	<	register RAY *r;
866	<	FVECT rn;
867	<	int al;
862	>	static double
863	>	makeambient( /* make a new ambient value for storage */
864	>	COLOR acol,
865	>	RAY *r,
866	>	FVECT rn,
867	>	int al
868	>	)
869		{
870		AMBVAL amb;
871		FVECT gp, gd;
872	<	/* compute weight */
873	<	amb.weight = pow(AVGREFL, (double)al);
874	<	if (r->rweight < 0.1amb.weight) / heuristic */
875	<	amb.weight = r->rweight;
872	>	int i;
873	>
874	>	amb.weight = 1.0; /* compute weight */
875	>	for (i = al; i-- > 0; )
876	>	amb.weight *= AVGREFL;
877	>	if (r->rweight < 0.1amb.weight) / heuristic override */
878	>	amb.weight = 1.25*r->rweight;
879	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
880		/* compute ambient */
881		amb.rad = doambient(acol, r, amb.weight, gp, gd);
882	<	if (amb.rad <= FTINY)
882	>	if (amb.rad <= FTINY) {
883	>	setcolor(acol, 0.0, 0.0, 0.0);
884		return(0.0);
885	<	/* store it */
885	>	}
886	>	scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */
887	>	/* store value */
888		VCOPY(amb.pos, r->rop);
889		VCOPY(amb.dir, r->ron);
890		amb.lvl = al;
#	Line 436 \| Line 899 \| int al;
899		}
900
901
902	<	void
903	<	extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */
904	<	COLOR cr;
905	<	register AMBVAL *ap;
906	<	FVECT pv, nv;
902	>	static void
903	>	extambient( /* extrapolate value at pv, nv */
904	>	COLOR cr,
905	>	AMBVAL *ap,
906	>	FVECT pv,
907	>	FVECT nv
908	>	)
909		{
910		FVECT v1;
911	<	register int i;
911	>	int i;
912		double d;
913
914		d = 1.0; /* zeroeth order */
#	Line 463 \| Line 928 \| FVECT pv, nv;
928
929
930		static void
931	<	initambfile(creat) /* initialize ambient file */
932	<	int creat;
931	>	avinsert( /* insert ambient value in our tree */
932	>	AMBVAL *av
933	>	)
934		{
935	+	AMBTREE *at;
936	+	AMBVAL *ap;
937	+	AMBVAL avh;
938	+	FVECT ck0;
939	+	double s;
940	+	int branch;
941	+	int i;
942	+
943	+	if (av->rad <= FTINY)
944	+	error(CONSISTENCY, "zero ambient radius in avinsert");
945	+	at = &atrunk;
946	+	VCOPY(ck0, thescene.cuorg);
947	+	s = thescene.cusize;
948	+	while (s(OCTSCALE/2) > av->radambacc) {
949	+	if (at->kid == NULL)
950	+	if ((at->kid = newambtree()) == NULL)
951	+	error(SYSTEM, "out of memory in avinsert");
952	+	s *= 0.5;
953	+	branch = 0;
954	+	for (i = 0; i < 3; i++)
955	+	if (av->pos[i] > ck0[i] + s) {
956	+	ck0[i] += s;
957	+	branch \|= 1 << i;
958	+	}
959	+	at = at->kid + branch;
960	+	}
961	+	avh.next = at->alist; /* order by increasing level */
962	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
963	+	if ( ap->next->lvl > av->lvl \|\|
964	+	(ap->next->lvl == av->lvl) &
965	+	(ap->next->weight <= av->weight) )
966	+	break;
967	+	av->next = ap->next;
968	+	ap->next = (AMBVAL*)av;
969	+	at->alist = avh.next;
970	+	}
971	+
972	+	#endif /* ! NEWAMB */
973	+
974	+	/*********** FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS *************/
975	+
976	+	static void
977	+	initambfile( /* initialize ambient file */
978	+	int cre8
979	+	)
980	+	{
981		extern char progname, octname;
982		static char *mybuf = NULL;
983
984		#ifdef F_SETLKW
985	<	aflock(creat ? F_WRLCK : F_RDLCK);
985	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
986		#endif
987		SET_FILE_BINARY(ambfp);
988		if (mybuf == NULL)
989		mybuf = (char *)bmalloc(BUFSIZ+8);
990		setbuf(ambfp, mybuf);
991	<	if (creat) { /* new file */
991	>	if (cre8) { /* new file */
992		newheader("RADIANCE", ambfp);
993		fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
994		progname, colval(ambval,RED),
#	Line 485 \| Line 997 \| int creat;
997		fprintf(ambfp, "-ad %d -as %d -ar %d ",
998		ambdiv, ambssamp, ambres);
999		if (octname != NULL)
1000	<	printargs(1, &octname, ambfp);
1001	<	else
490	<	fputc('\n', ambfp);
1000	>	fputs(octname, ambfp);
1001	>	fputc('\n', ambfp);
1002		fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1003		fputnow(ambfp);
1004		fputformat(AMBFMT, ambfp);
1005	<	putc('\n', ambfp);
1005	>	fputc('\n', ambfp);
1006		putambmagic(ambfp);
1007		} else if (checkheader(ambfp, AMBFMT, NULL) < 0 \|\| !hasambmagic(ambfp))
1008		error(USER, "bad ambient file");
#	Line 499 \| Line 1010 \| int creat;
1010
1011
1012		static void
1013	<	avsave(av) /* insert and save an ambient value */
1014	<	AMBVAL *av;
1013	>	avsave( /* insert and save an ambient value */
1014	>	AMBVAL *av
1015	>	)
1016		{
1017	<	avinsert(avstore(av));
1017	>	avstore(av);
1018		if (ambfp == NULL)
1019		return;
1020		if (writambval(av, ambfp) < 0)
#	Line 517 \| Line 1029 \| writerr:
1029
1030
1031		static AMBVAL *
1032	<	avstore(aval) /* allocate memory and store aval */
1033	<	register AMBVAL *aval;
1032	>	avstore( /* allocate memory and save aval */
1033	>	AMBVAL *aval
1034	>	)
1035		{
1036	<	register AMBVAL *av;
1036	>	AMBVAL *av;
1037		double d;
1038
1039		if ((av = newambval()) == NULL)
1040		error(SYSTEM, "out of memory in avstore");
1041	<	copystruct(av, aval);
1041	>	av = aval;
1042		av->latick = ambclock;
1043		av->next = NULL;
1044		nambvals++;
#	Line 534 \| Line 1047 \| *register AMBVAL aval;**
1047		avsum += log(d);
1048		navsum++;
1049		}
1050	+	avinsert(av); /* insert in our cache tree */
1051		return(av);
1052		}
1053
#	Line 544 \| Line 1058 \| *static AMBTREE atfreelist = NULL; /* free ambient tr**
1058
1059
1060		static AMBTREE *
1061	<	newambtree() /* allocate 8 ambient tree structs */
1061	>	newambtree(void) /* allocate 8 ambient tree structs */
1062		{
1063	<	register AMBTREE atp, upperlim;
1063	>	AMBTREE atp, upperlim;
1064
1065		if (atfreelist == NULL) { /* get more nodes */
1066		atfreelist = (AMBTREE )malloc(ATALLOCSZ8*sizeof(AMBTREE));
#	Line 560 \| Line 1074 \| *newambtree() / allocate 8 ambient tree structs /*
1074		}
1075		atp = atfreelist;
1076		atfreelist = atp->kid;
1077	<	bzero((char )atp, 8sizeof(AMBTREE));
1077	>	memset((char )atp, '\0', 8sizeof(AMBTREE));
1078		return(atp);
1079		}
1080
1081
1082		static void
1083	<	freeambtree(atp) /* free 8 ambient tree structs */
1084	<	AMBTREE *atp;
1083	>	freeambtree( /* free 8 ambient tree structs */
1084	>	AMBTREE *atp
1085	>	)
1086		{
1087		atp->kid = atfreelist;
1088		atfreelist = atp;
#	Line 575 \| Line 1090 \| *AMBTREE atp;**
1090
1091
1092		static void
1093	<	avinsert(av) /* insert ambient value in our tree */
1094	<	register AMBVAL *av;
1093	>	unloadatree( /* unload an ambient value tree */
1094	>	AMBTREE *at,
1095	>	unloadtf_t *f
1096	>	)
1097		{
1098	<	register AMBTREE *at;
1099	<	register AMBVAL *ap;
583	<	AMBVAL avh;
584	<	FVECT ck0;
585	<	double s;
586	<	int branch;
587	<	register int i;
588	<
589	<	if (av->rad <= FTINY)
590	<	error(CONSISTENCY, "zero ambient radius in avinsert");
591	<	at = &atrunk;
592	<	VCOPY(ck0, thescene.cuorg);
593	<	s = thescene.cusize;
594	<	while (s(OCTSCALE/2) > av->radambacc) {
595	<	if (at->kid == NULL)
596	<	if ((at->kid = newambtree()) == NULL)
597	<	error(SYSTEM, "out of memory in avinsert");
598	<	s *= 0.5;
599	<	branch = 0;
600	<	for (i = 0; i < 3; i++)
601	<	if (av->pos[i] > ck0[i] + s) {
602	<	ck0[i] += s;
603	<	branch \|= 1 << i;
604	<	}
605	<	at = at->kid + branch;
606	<	}
607	<	avh.next = at->alist; /* order by increasing level */
608	<	for (ap = &avh; ap->next != NULL; ap = ap->next)
609	<	if (ap->next->lvl >= av->lvl)
610	<	break;
611	<	av->next = ap->next;
612	<	ap->next = av;
613	<	at->alist = avh.next;
614	<	}
615	<
616	<
617	<	static void
618	<	unloadatree(at, f) /* unload an ambient value tree */
619	<	register AMBTREE *at;
620	<	void (*f)();
621	<	{
622	<	register AMBVAL *av;
623	<	register int i;
1098	>	AMBVAL *av;
1099	>	int i;
1100		/* transfer values at this node */
1101		for (av = at->alist; av != NULL; av = at->alist) {
1102		at->alist = av->next;
#	Line 642 \| Line 1118 \| static struct avl {
1118		static AMBVAL *avlist2; / memory positions for sorting */
1119		static int i_avlist; /* index for lists */
1120
1121	+	static int alatcmp(const void av1, const void av2);
1122
1123	<	static int
1124	<	av2list(av)
648	<	register AMBVAL *av;
1123	>	static void
1124	>	avfree(AMBVAL *av)
1125		{
1126	+	free(av);
1127	+	}
1128	+
1129	+	static void
1130	+	av2list(
1131	+	AMBVAL *av
1132	+	)
1133	+	{
1134		#ifdef DEBUG
1135		if (i_avlist >= nambvals)
1136		error(CONSISTENCY, "too many ambient values in av2list1");
1137		#endif
1138	<	avlist1[i_avlist].p = avlist2[i_avlist] = av;
1138	>	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1139		avlist1[i_avlist++].t = av->latick;
1140		}
1141
1142
1143		static int
1144	<	alatcmp(av1, av2) /* compare ambient values for MRA */
1145	<	struct avl av1, av2;
1144	>	alatcmp( /* compare ambient values for MRA */
1145	>	const void *av1,
1146	>	const void *av2
1147	>	)
1148		{
1149	<	register long lc = av2->t - av1->t;
1149	>	long lc = ((struct avl )av2)->t - ((struct avl )av1)->t;
1150		return(lc<0 ? -1 : lc>0 ? 1 : 0);
1151		}
1152
#	Line 672 \| Line 1158 \| *struct avl av1, av2;*
1158		* assumes pointers differ by exact struct size increments.
1159		*/
1160		static int
1161	<	aposcmp(avp1, avp2) /* compare ambient value positions */
1162	<	const void avp1, avp2;
1161	>	aposcmp( /* compare ambient value positions */
1162	>	const void *avp1,
1163	>	const void *avp2
1164	>	)
1165		{
1166	<	register long diff = (char const )avp1 - (char * const *)avp2;
1166	>	long diff = (char const )avp1 - (char * const *)avp2;
1167		if (diff < 0)
1168		return(-1);
1169		return(diff > 0);
1170		}
1171
1172	<	#if 1
1172	>
1173		static int
1174	<	avlmemi(avaddr) /* find list position from address */
1175	<	AMBVAL *avaddr;
1174	>	avlmemi( /* find list position from address */
1175	>	AMBVAL *avaddr
1176	>	)
1177		{
1178	<	register AMBVAL **avlpp;
1178	>	AMBVAL **avlpp;
1179
1180		avlpp = (AMBVAL *)bsearch((char )&avaddr, (char *)avlist2,
1181	<	nambvals, sizeof(AMBVAL *), aposcmp);
1181	>	nambvals, sizeof(AMBVAL *), &aposcmp);
1182		if (avlpp == NULL)
1183		error(CONSISTENCY, "address not found in avlmemi");
1184		return(avlpp - avlist2);
1185		}
697	–	#else
698	–	#define avlmemi(avaddr) ((AMBVAL *)bsearch((char )&avaddr,(char *)avlist2, \
699	–	nambvals,sizeof(AMBVAL *),aposcmp) - avlist2)
700	–	#endif
1186
1187
1188		static void
1189	<	sortambvals(always) /* resort ambient values */
1190	<	int always;
1189	>	sortambvals( /* resort ambient values */
1190	>	int always
1191	>	)
1192		{
1193		AMBTREE oldatrunk;
1194		AMBVAL tav, tap, pnext;
1195	<	register int i, j;
1195	>	int i, j;
1196		/* see if it's time yet */
1197		if (!always && (ambclock++ < lastsort+sortintvl \|\|
1198		nambvals < SORT_THRESH))
#	Line 737 \| Line 1223 \| int always;
1223		if (avlist2 != NULL)
1224		free((void *)avlist2);
1225		if (always) { /* rebuild without sorting */
1226	<	copystruct(&oldatrunk, &atrunk);
1226	>	oldatrunk = atrunk;
1227		atrunk.alist = NULL;
1228		atrunk.kid = NULL;
1229		unloadatree(&oldatrunk, avinsert);
#	Line 768 \| Line 1254 \| int always;
1254		if (avlist1[i].p == NULL)
1255		continue;
1256		tap = avlist2[i];
1257	<	copystruct(&tav, tap);
1257	>	tav = *tap;
1258		for (j = i; (pnext = avlist1[j].p) != tap;
1259		j = avlmemi(pnext)) {
1260	<	copystruct(avlist2[j], pnext);
1260	>	(avlist2[j]) = pnext;
1261		avinsert(avlist2[j]);
1262		avlist1[j].p = NULL;
1263		}
1264	<	copystruct(avlist2[j], &tav);
1264	>	*(avlist2[j]) = tav;
1265		avinsert(avlist2[j]);
1266		avlist1[j].p = NULL;
1267		}
#	Line 800 \| Line 1286 \| int always;
1286		#ifdef F_SETLKW
1287
1288		static void
1289	<	aflock(typ) /* lock/unlock ambient file */
1290	<	int typ;
1289	>	aflock( /* lock/unlock ambient file */
1290	>	int typ
1291	>	)
1292		{
1293		static struct flock fls; /* static so initialized to zeroes */
1294
1295	+	if (typ == fls.l_type) /* already called? */
1296	+	return;
1297		fls.l_type = typ;
1298		if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1299		error(SYSTEM, "cannot (un)lock ambient file");
#	Line 812 \| Line 1301 \| int typ;
1301
1302
1303		int
1304	<	ambsync() /* synchronize ambient file */
1304	>	ambsync(void) /* synchronize ambient file */
1305		{
1306		long flen;
1307		AMBVAL avs;
1308	<	register int n;
1308	>	int n;
1309
1310	<	if (nunflshed == 0)
1310	>	if (ambfp == NULL) /* no ambient file? */
1311		return(0);
1312	<	if (lastpos < 0) /* initializing (locked in initambfile) */
1313	<	goto syncend;
825	<	/* gain exclusive access */
826	<	aflock(F_WRLCK);
1312	>	/* gain appropriate access */
1313	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1314		/* see if file has grown */
1315	<	if ((flen = lseek(fileno(ambfp), (off_t)0L, 2)) < 0)
1315	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1316		goto seekerr;
1317	<	if (n = flen - lastpos) { /* file has grown */
1317	>	if ((n = flen - lastpos) > 0) { /* file has grown */
1318		if (ambinp == NULL) { /* use duplicate filedes */
1319		ambinp = fdopen(dup(fileno(ambfp)), "r");
1320		if (ambinp == NULL)
1321		error(SYSTEM, "fdopen failed in ambsync");
1322		}
1323	<	if (fseek(ambinp, lastpos, 0) < 0)
1323	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1324		goto seekerr;
1325		while (n >= AMBVALSIZ) { /* load contributed values */
1326		if (!readambval(&avs, ambinp)) {
#	Line 843 \| Line 1330 \| *ambsync() / synchronize ambient file /*
1330		error(WARNING, errmsg);
1331		break;
1332		}
1333	<	avinsert(avstore(&avs));
1333	>	avstore(&avs);
1334		n -= AMBVALSIZ;
1335		}
1336	+	lastpos = flen - n;
1337		/*** seek always as safety measure
1338		if (n) **/ / alignment */
1339	<	if (lseek(fileno(ambfp), (off_t)(flen-n), 0) < 0)
1339	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1340		goto seekerr;
1341		}
854	–	#ifdef DEBUG
855	–	if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) {
856	–	sprintf(errmsg, "ambient file buffer at %d rather than %d",
857	–	ambfp->_ptr - ambfp->_base,
858	–	nunflshed*AMBVALSIZ);
859	–	error(CONSISTENCY, errmsg);
860	–	}
861	–	#endif
862	–	syncend:
1342		n = fflush(ambfp); /* calls write() at last */
1343	<	if ((lastpos = lseek(fileno(ambfp), (off_t)0L, 1)) < 0)
1343	>	if (n != EOF)
1344	>	lastpos += (long)nunflshed*AMBVALSIZ;
1345	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1346		goto seekerr;
1347	+
1348		aflock(F_UNLCK); /* release file */
1349		nunflshed = 0;
1350		return(n);
1351		seekerr:
1352		error(SYSTEM, "seek failed in ambsync");
1353	+	return -1; /* pro forma return */
1354		}
1355
1356	<	#else
1356	>	#else /* ! F_SETLKW */
1357
1358		int
1359	<	ambsync() /* flush ambient file */
1359	>	ambsync(void) /* flush ambient file */
1360		{
1361	<	if (nunflshed == 0)
1361	>	if (ambfp == NULL)
1362		return(0);
1363		nunflshed = 0;
1364		return(fflush(ambfp));
1365		}
1366
1367	<	#endif
1367	>	#endif /* ! F_SETLKW */

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Comparing ray/src/rt/ambient.c (file contents): Revision 2.50 by schorsch, Thu Jun 5 19:29:34 2003 UTC vs. Revision 2.100 by greg, Thu Mar 3 22:47:21 2016 UTC

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Comparing ray/src/rt/ambient.c (file contents):
Revision 2.50 by schorsch, Thu Jun 5 19:29:34 2003 UTC vs.
Revision 2.100 by greg, Thu Mar 3 22:47:21 2016 UTC