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root/radiance/ray/src/rt/ambient.c

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.17 by greg, Tue Jan 26 09:08:20 1993 UTC vs.
Revision 2.73 by greg, Wed Apr 16 20:32:00 2014 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1993 Regents of the University of California */
2	–
1		#ifndef lint
2	<	static char SCCSid[] = "$SunId$ LBL";
2	>	static const char       RCSid[] = "$Id$";
3		#endif
6	–
4		/*
5		*  ambient.c - routines dealing with ambient (inter-reflected) component.
6	+	*
7	+	*  Declarations of external symbols in ambient.h
8		*/
9
10	<	#include  "ray.h"
10	>	#include "copyright.h"
11
12	<	#include  "octree.h"
12	>	#include <string.h>
13
14	+	#include  "platform.h"
15	+	#include  "ray.h"
16		#include  "otypes.h"
17	<
17	>	#include  "resolu.h"
18		#include  "ambient.h"
18	–
19		#include  "random.h"
20
21	<	#define  OCTSCALE       0.5     /* ceil((valid rad.)/(cube size)) */
21	>	#ifndef  OCTSCALE
22	>	#define  OCTSCALE       1.0     /* ceil((valid rad.)/(cube size)) */
23	>	#endif
24
25	<	typedef struct ambtree {
24	<	AMBVAL  *alist;         /* ambient value list */
25	<	struct ambtree  *kid;   /* 8 child nodes */
26	<	}  AMBTREE;                     /* ambient octree */
25	>	extern char  *shm_boundary;     /* memory sharing boundary */
26
27	<	extern CUBE  thescene;          /* contains space boundaries */
28	<
29	<	#define  MAXASET        511     /* maximum number of elements in ambient set */
27	>	#ifndef  MAXASET
28	>	#define  MAXASET        4095    /* maximum number of elements in ambient set */
29	>	#endif
30		OBJECT  ambset[MAXASET+1]={0};  /* ambient include/exclude set */
31
32		double  maxarad;                /* maximum ambient radius */
#	Line 38 | Line 37 | static AMBTREE atrunk;         /* our ambient trunk node */
37		static FILE  *ambfp = NULL;     /* ambient file pointer */
38		static int  nunflshed = 0;      /* number of unflushed ambient values */
39
40	+	#ifndef SORT_THRESH
41	+	#ifdef SMLMEM
42	+	#define SORT_THRESH     ((16L<<20)/sizeof(AMBVAL))
43	+	#else
44	+	#define SORT_THRESH     ((64L<<20)/sizeof(AMBVAL))
45	+	#endif
46	+	#endif
47	+	#ifndef SORT_INTVL
48	+	#define SORT_INTVL      (SORT_THRESH<<1)
49	+	#endif
50	+	#ifndef MAX_SORT_INTVL
51	+	#define MAX_SORT_INTVL  (SORT_INTVL<<6)
52	+	#endif
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 */
57	+	static unsigned int  nambshare = 0;     /* number of values from file */
58	+	static unsigned long  ambclock = 0;     /* ambient access clock */
59	+	static unsigned long  lastsort = 0;     /* time of last value sort */
60	+	static long  sortintvl = SORT_INTVL;    /* time until next sort */
61	+	static FILE  *ambinp = NULL;            /* auxiliary file for input */
62	+	static long  lastpos = -1;              /* last flush position */
63	+
64	+	#define MAXACLOCK       (1L<<30)        /* clock turnover value */
65	+	/*
66	+	* Track access times unless we are sharing ambient values
67	+	* through memory on a multiprocessor, when we want to avoid
68	+	* claiming our own memory (copy on write).  Go ahead anyway
69	+	* if more than two thirds of our values are unshared.
70	+	* Compile with -Dtracktime=0 to turn this code off.
71	+	*/
72	+	#ifndef tracktime
73	+	#define tracktime       (shm_boundary == NULL || nambvals > 3*nambshare)
74	+	#endif
75	+
76		#define  AMBFLUSH       (BUFSIZ/AMBVALSIZ)
77
78	<	#define  newambval()    (AMBVAL *)bmalloc(sizeof(AMBVAL))
78	>	#define  newambval()    (AMBVAL *)malloc(sizeof(AMBVAL))
79	>	#define  freeav(av)     free((void *)av);
80
81	<	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
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	<	extern long  ftell(), lseek();
88	<	static int  initambfile(), avsave(), avinsert();
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	<	setambres(ar)                           /* set ambient resolution */
98	<	int  ar;
97	>	#ifdef  F_SETLKW
98	>	static void aflock(int  typ);
99	>	#endif
100	>
101	>
102	>	void
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 = 0.0;
110	>	minarad = 0;
111		maxarad = thescene.cusize / 2.0;
112		} else {
113		minarad = thescene.cusize / ar;
114	<	maxarad = 16.0 * minarad;               /* heuristic */
114	>	maxarad = 64 * minarad;                 /* heuristic */
115		if (maxarad > thescene.cusize / 2.0)
116		maxarad = thescene.cusize / 2.0;
117		}
118	<	if (maxarad <= FTINY)
119	<	maxarad = .001;
118	>	if (minarad <= FTINY)
119	>	minarad = 10*FTINY;
120	>	if (maxarad <= minarad)
121	>	maxarad = 64 * minarad;
122		}
123
124
125	<	setambient(afile)                       /* initialize calculation */
126	<	char  *afile;
125	>	void
126	>	setambacc(                              /* set ambient accuracy */
127	>	double  newa
128	>	)
129		{
130	<	long  headlen;
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 */
137	>	}
138	>
139	>
140	>	void
141	>	setambient(void)                                /* initialize calculation */
142	>	{
143	>	int     readonly = 0;
144	>	long    flen;
145		AMBVAL  amb;
146	+	/* make sure we're fresh */
147	+	ambdone();
148		/* init ambient limits */
149		setambres(ambres);
150	+	setambacc(ambacc);
151	+	if (ambfile == NULL || !ambfile[0])
152	+	return;
153	+	if (ambacc <= FTINY) {
154	+	sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
155	+	ambfile);
156	+	error(WARNING, errmsg);
157	+	return;
158	+	}
159		/* open ambient file */
160	<	if (afile != NULL) {
161	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
162	<	initambfile(0);
163	<	headlen = ftell(ambfp);
164	<	while (readambval(&amb, ambfp))
165	<	avinsert(&amb, &atrunk, thescene.cuorg,
166	<	thescene.cusize);
167	<	/* align */
168	<	fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1);
169	<	} else if ((ambfp = fopen(afile, "w+")) != NULL)
170	<	initambfile(1);
171	<	else {
172	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
173	<	afile);
174	<	error(SYSTEM, errmsg);
160	>	if ((ambfp = fopen(ambfile, "r+")) == NULL)
161	>	readonly = (ambfp = fopen(ambfile, "r")) != NULL;
162	>	if (ambfp != NULL) {
163	>	initambfile(0);                 /* file exists */
164	>	lastpos = ftell(ambfp);
165	>	while (readambval(&amb, ambfp))
166	>	avinsert(avstore(&amb));
167	>	nambshare = nambvals;           /* share loaded values */
168	>	if (readonly) {
169	>	sprintf(errmsg,
170	>	"loaded %u values from read-only ambient file",
171	>	nambvals);
172	>	error(WARNING, errmsg);
173	>	fclose(ambfp);          /* close file so no writes */
174	>	ambfp = NULL;
175	>	return;                 /* avoid ambsync() */
176		}
177	<	nunflshed++;    /* lie */
177	>	/* align file pointer */
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 - lastpos)/AMBVALSIZ);
184	>	error(WARNING, errmsg);
185	>	fseek(ambfp, lastpos, SEEK_SET);
186	>	#ifndef _WIN32 /* XXX we need a replacement for that one */
187	>	ftruncate(fileno(ambfp), (off_t)lastpos);
188	>	#endif
189	>	}
190	>	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
191	>	initambfile(1);                 /* else create new file */
192	>	fflush(ambfp);
193	>	lastpos = ftell(ambfp);
194	>	} else {
195	>	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
196	>	error(SYSTEM, errmsg);
197	>	}
198	>	#ifdef getc_unlocked
199	>	flockfile(ambfp);                       /* application-level lock */
200	>	#endif
201	>	#ifdef  F_SETLKW
202	>	aflock(F_UNLCK);                        /* release file */
203	>	#endif
204	>	}
205	>
206	>
207	>	void
208	>	ambdone(void)                   /* close ambient file and free memory */
209	>	{
210	>	if (ambfp != NULL) {            /* close ambient file */
211		ambsync();
212	+	fclose(ambfp);
213	+	ambfp = NULL;
214	+	if (ambinp != NULL) {
215	+	fclose(ambinp);
216	+	ambinp = NULL;
217	+	}
218	+	lastpos = -1;
219		}
220	+	/* free ambient tree */
221	+	unloadatree(&atrunk, &avfree);
222	+	/* reset state variables */
223	+	avsum = 0.;
224	+	navsum = 0;
225	+	nambvals = 0;
226	+	nambshare = 0;
227	+	ambclock = 0;
228	+	lastsort = 0;
229	+	sortintvl = SORT_INTVL;
230		}
231
232
233	<	ambnotify(obj)                  /* record new modifier */
234	<	OBJECT  obj;
233	>	void
234	>	ambnotify(                      /* record new modifier */
235	>	OBJECT  obj
236	>	)
237		{
238		static int  hitlimit = 0;
239	<	register OBJREC  *o = objptr(obj);
240	<	register char  **amblp;
239	>	OBJREC   *o;
240	>	char  **amblp;
241
242	+	if (obj == OVOID) {             /* starting over */
243	+	ambset[0] = 0;
244	+	hitlimit = 0;
245	+	return;
246	+	}
247	+	o = objptr(obj);
248		if (hitlimit || !ismodifier(o->otype))
249		return;
250		for (amblp = amblist; *amblp != NULL; amblp++)
#	Line 117 | Line 259 | OBJECT obj;
259		}
260		}
261
262	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
263
264	<	ambient(acol, r)                /* compute ambient component for ray */
265	<	COLOR  acol;
266	<	register RAY  *r;
264	>	#ifdef NEWAMB
265	>
266	>	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
267	>
268	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
269	>	AMBTREE *at, FVECT c0, double s);
270	>	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
271	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
272	>	FVECT uvw[3]);
273	>
274	>	void
275	>	multambient(            /* compute ambient component & multiply by coef. */
276	>	COLOR  aval,
277	>	RAY  *r,
278	>	FVECT  nrm
279	>	)
280		{
281		static int  rdepth = 0;                 /* ambient recursion */
282	<	double  d;
282	>	COLOR   acol;
283	>	int     ok;
284	>	double  d, l;
285
286		if (ambdiv <= 0)                        /* no ambient calculation */
287		goto dumbamb;
#	Line 136 | Line 294 | register RAY  *r;
294		goto dumbamb;
295
296		if (ambacc <= FTINY) {                  /* no ambient storage */
297	+	copycolor(acol, aval);
298		rdepth++;
299	<	d = doambient(acol, r, r->rweight, NULL, NULL);
299	>	ok = doambient(acol, r, r->rweight, NULL, NULL, NULL, NULL);
300		rdepth--;
301	<	if (d == 0.0)
301	>	if (!ok)
302		goto dumbamb;
303	+	copycolor(aval, acol);
304		return;
305		}
306	<	/* get ambient value */
306	>
307	>	if (tracktime)                          /* sort to minimize thrashing */
308	>	sortambvals(0);
309	>	/* interpolate ambient value */
310		setcolor(acol, 0.0, 0.0, 0.0);
311	<	d = sumambient(acol, r, rdepth,
311	>	d = sumambient(acol, r, nrm, rdepth,
312		&atrunk, thescene.cuorg, thescene.cusize);
313	<	if (d > FTINY)
314	<	scalecolor(acol, 1.0/d);
315	<	else {
316	<	d = makeambient(acol, r, rdepth++);
317	<	rdepth--;
313	>	if (d > FTINY) {
314	>	d = 1.0/d;
315	>	scalecolor(acol, d);
316	>	multcolor(aval, acol);
317	>	return;
318		}
319	<	if (d > FTINY)
319	>	rdepth++;                               /* need to cache new value */
320	>	ok = makeambient(acol, r, nrm, rdepth-1);
321	>	rdepth--;
322	>	if (ok) {
323	>	multcolor(aval, acol);          /* computed new value */
324		return;
325	+	}
326		dumbamb:                                        /* return global value */
327	<	copycolor(acol, ambval);
327	>	if ((ambvwt <= 0) | (navsum == 0)) {
328	>	multcolor(aval, ambval);
329	>	return;
330	>	}
331	>	l = bright(ambval);                     /* average in computations */
332	>	if (l > FTINY) {
333	>	d = (log(l)*(double)ambvwt + avsum) /
334	>	(double)(ambvwt + navsum);
335	>	d = exp(d) / l;
336	>	scalecolor(aval, d);
337	>	multcolor(aval, ambval);        /* apply color of ambval */
338	>	} else {
339	>	d = exp( avsum / (double)navsum );
340	>	scalecolor(aval, d);            /* neutral color */
341	>	}
342		}
343
344
345		double
346	<	sumambient(acol, r, al, at, c0, s)      /* get interpolated ambient value */
347	<	COLOR  acol;
348	<	register RAY  *r;
349	<	int  al;
350	<	AMBTREE  *at;
351	<	FVECT  c0;
352	<	double  s;
346	>	sumambient(             /* get interpolated ambient value */
347	>	COLOR  acol,
348	>	RAY  *r,
349	>	FVECT  rn,
350	>	int  al,
351	>	AMBTREE  *at,
352	>	FVECT  c0,
353	>	double  s
354	>	)
355	>	{                                       /* initial limit is ambacc radians */
356	>	const double    maxangle = (ambacc-PI/2.)*pow(r->rweight,0.13) + PI/2.;
357	>	double          wsum = 0.0;
358	>	FVECT           ck0;
359	>	int             i, j;
360	>	AMBVAL          *av;
361	>	/* sum this node */
362	>	for (av = at->alist; av != NULL; av = av->next) {
363	>	double  d, delta_r2, delta_t2;
364	>	COLOR   ct;
365	>	FVECT   uvw[3];
366	>	/* record access */
367	>	if (tracktime)
368	>	av->latick = ambclock;
369	>	/*
370	>	*  Ambient level test
371	>	*/
372	>	if (av->lvl > al)       /* list sorted, so this works */
373	>	break;
374	>	if (av->weight < 0.9*r->rweight)
375	>	continue;
376	>	/*
377	>	*  Direction test using unperturbed normal
378	>	*/
379	>	decodedir(uvw[2], av->ndir);
380	>	d = DOT(uvw[2], r->ron);
381	>	if (d <= 0.0)           /* >= 90 degrees */
382	>	continue;
383	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
384	>	if (delta_r2 >= maxangle*maxangle)
385	>	continue;
386	>	/*
387	>	*  Elliptical radii test based on Hessian
388	>	*/
389	>	decodedir(uvw[0], av->udir);
390	>	VCROSS(uvw[1], uvw[2], uvw[0]);
391	>	VSUB(ck0, av->pos, r->rop);
392	>	d = DOT(ck0, uvw[0]) / av->rad[0];
393	>	delta_t2 = d*d;
394	>	d = DOT(ck0, uvw[1]) / av->rad[1];
395	>	delta_t2 += d*d;
396	>	if (delta_t2 >= ambacc*ambacc)
397	>	continue;
398	>	/*
399	>	*  Intersection behind test
400	>	*/
401	>	d = 0.0;
402	>	for (j = 0; j < 3; j++)
403	>	d += (r->rop[j] - av->pos[j])*(uvw[2][j] + r->ron[j]);
404	>	if (d*0.5 < -minarad*ambacc-.001)
405	>	continue;
406	>	/*
407	>	*  Extrapolate value and compute final weight (hat function)
408	>	*/
409	>	extambient(ct, av, r->rop, rn, uvw);
410	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
411	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
412	>	scalecolor(ct, d);
413	>	addcolor(acol, ct);
414	>	wsum += d;
415	>	}
416	>	if (at->kid == NULL)
417	>	return(wsum);
418	>	/* sum children */
419	>	s *= 0.5;
420	>	for (i = 0; i < 8; i++) {
421	>	for (j = 0; j < 3; j++) {
422	>	ck0[j] = c0[j];
423	>	if (1<<j & i)
424	>	ck0[j] += s;
425	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
426	>	break;
427	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
428	>	break;
429	>	}
430	>	if (j == 3)
431	>	wsum += sumambient(acol, r, rn, al,
432	>	at->kid+i, ck0, s);
433	>	}
434	>	return(wsum);
435	>	}
436	>
437	>
438	>	int
439	>	makeambient(            /* make a new ambient value for storage */
440	>	COLOR  acol,
441	>	RAY  *r,
442	>	FVECT  rn,
443	>	int  al
444	>	)
445		{
446	+	AMBVAL  amb;
447	+	FVECT   uvw[3];
448	+	int     i;
449	+
450	+	amb.weight = 1.0;                       /* compute weight */
451	+	for (i = al; i-- > 0; )
452	+	amb.weight *= AVGREFL;
453	+	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
454	+	amb.weight = 1.25*r->rweight;
455	+	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
456	+	/* compute ambient */
457	+	i = doambient(acol, r, amb.weight, uvw, amb.rad, amb.gpos, amb.gdir);
458	+	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
459	+	if (i <= 0)                             /* no Hessian => no storage */
460	+	return(i);
461	+	/* store value */
462	+	VCOPY(amb.pos, r->rop);
463	+	amb.ndir = encodedir(r->ron);
464	+	amb.udir = encodedir(uvw[0]);
465	+	amb.lvl = al;
466	+	copycolor(amb.val, acol);
467	+	/* insert into tree */
468	+	avsave(&amb);                           /* and save to file */
469	+	if (rn != r->ron) {                     /* texture */
470	+	VCOPY(uvw[2], r->ron);
471	+	extambient(acol, &amb, r->rop, rn, uvw);
472	+	}
473	+	return(1);
474	+	}
475	+
476	+
477	+	void
478	+	extambient(             /* extrapolate value at pv, nv */
479	+	COLOR  cr,
480	+	AMBVAL   *ap,
481	+	FVECT  pv,
482	+	FVECT  nv,
483	+	FVECT  uvw[3]
484	+	)
485	+	{
486	+	static FVECT    my_uvw[3];
487	+	FVECT           v1;
488	+	int             i;
489	+	double          d = 1.0;        /* zeroeth order */
490	+
491	+	if (uvw == NULL) {              /* need local coordinates? */
492	+	decodedir(my_uvw[2], ap->ndir);
493	+	decodedir(my_uvw[0], ap->udir);
494	+	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
495	+	uvw = my_uvw;
496	+	}
497	+	for (i = 3; i--; )              /* gradient due to translation */
498	+	d += (pv[i] - ap->pos[i]) *
499	+	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
500	+
501	+	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
502	+	for (i = 3; i--; )
503	+	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
504	+
505	+	if (d <= 0.0) {
506	+	setcolor(cr, 0.0, 0.0, 0.0);
507	+	return;
508	+	}
509	+	copycolor(cr, ap->val);
510	+	scalecolor(cr, d);
511	+	}
512	+
513	+
514	+	static void
515	+	avinsert(                               /* insert ambient value in our tree */
516	+	AMBVAL *av
517	+	)
518	+	{
519	+	AMBTREE  *at;
520	+	AMBVAL  *ap;
521	+	AMBVAL  avh;
522	+	FVECT  ck0;
523	+	double  s;
524	+	int  branch;
525	+	int  i;
526	+
527	+	if (av->rad[0] <= FTINY)
528	+	error(CONSISTENCY, "zero ambient radius in avinsert");
529	+	at = &atrunk;
530	+	VCOPY(ck0, thescene.cuorg);
531	+	s = thescene.cusize;
532	+	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
533	+	if (at->kid == NULL)
534	+	if ((at->kid = newambtree()) == NULL)
535	+	error(SYSTEM, "out of memory in avinsert");
536	+	s *= 0.5;
537	+	branch = 0;
538	+	for (i = 0; i < 3; i++)
539	+	if (av->pos[i] > ck0[i] + s) {
540	+	ck0[i] += s;
541	+	branch |= 1 << i;
542	+	}
543	+	at = at->kid + branch;
544	+	}
545	+	avh.next = at->alist;           /* order by increasing level */
546	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
547	+	if (ap->next->lvl >= av->lvl)
548	+	break;
549	+	av->next = ap->next;
550	+	ap->next = (AMBVAL*)av;
551	+	at->alist = avh.next;
552	+	}
553	+
554	+
555	+	#else /* ! NEWAMB */
556	+
557	+	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
558	+	AMBTREE *at, FVECT c0, double s);
559	+	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
560	+	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
561	+
562	+
563	+	void
564	+	multambient(            /* compute ambient component & multiply by coef. */
565	+	COLOR  aval,
566	+	RAY  *r,
567	+	FVECT  nrm
568	+	)
569	+	{
570	+	static int  rdepth = 0;                 /* ambient recursion */
571	+	COLOR   acol;
572	+	double  d, l;
573	+
574	+	if (ambdiv <= 0)                        /* no ambient calculation */
575	+	goto dumbamb;
576	+	/* check number of bounces */
577	+	if (rdepth >= ambounce)
578	+	goto dumbamb;
579	+	/* check ambient list */
580	+	if (ambincl != -1 && r->ro != NULL &&
581	+	ambincl != inset(ambset, r->ro->omod))
582	+	goto dumbamb;
583	+
584	+	if (ambacc <= FTINY) {                  /* no ambient storage */
585	+	copycolor(acol, aval);
586	+	rdepth++;
587	+	d = doambient(acol, r, r->rweight, NULL, NULL);
588	+	rdepth--;
589	+	if (d <= FTINY)
590	+	goto dumbamb;
591	+	copycolor(aval, acol);
592	+	return;
593	+	}
594	+
595	+	if (tracktime)                          /* sort to minimize thrashing */
596	+	sortambvals(0);
597	+	/* interpolate ambient value */
598	+	setcolor(acol, 0.0, 0.0, 0.0);
599	+	d = sumambient(acol, r, nrm, rdepth,
600	+	&atrunk, thescene.cuorg, thescene.cusize);
601	+	if (d > FTINY) {
602	+	d = 1.0/d;
603	+	scalecolor(acol, d);
604	+	multcolor(aval, acol);
605	+	return;
606	+	}
607	+	rdepth++;                               /* need to cache new value */
608	+	d = makeambient(acol, r, nrm, rdepth-1);
609	+	rdepth--;
610	+	if (d > FTINY) {
611	+	multcolor(aval, acol);          /* got new value */
612	+	return;
613	+	}
614	+	dumbamb:                                        /* return global value */
615	+	if ((ambvwt <= 0) | (navsum == 0)) {
616	+	multcolor(aval, ambval);
617	+	return;
618	+	}
619	+	l = bright(ambval);                     /* average in computations */
620	+	if (l > FTINY) {
621	+	d = (log(l)*(double)ambvwt + avsum) /
622	+	(double)(ambvwt + navsum);
623	+	d = exp(d) / l;
624	+	scalecolor(aval, d);
625	+	multcolor(aval, ambval);        /* apply color of ambval */
626	+	} else {
627	+	d = exp( avsum / (double)navsum );
628	+	scalecolor(aval, d);            /* neutral color */
629	+	}
630	+	}
631	+
632	+
633	+	static double
634	+	sumambient(     /* get interpolated ambient value */
635	+	COLOR  acol,
636	+	RAY  *r,
637	+	FVECT  rn,
638	+	int  al,
639	+	AMBTREE  *at,
640	+	FVECT  c0,
641	+	double  s
642	+	)
643	+	{
644		double  d, e1, e2, wt, wsum;
645		COLOR  ct;
646		FVECT  ck0;
647		int  i;
648	<	register int  j;
649	<	register AMBVAL  *av;
650	<	/* do this node */
648	>	int  j;
649	>	AMBVAL   *av;
650	>
651		wsum = 0.0;
652	+	/* do this node */
653		for (av = at->alist; av != NULL; av = av->next) {
654	+	double  rn_dot = -2.0;
655	+	if (tracktime)
656	+	av->latick = ambclock;
657		/*
658		*  Ambient level test.
659		*/
660	<	if (av->lvl > al || av->weight < r->rweight-FTINY)
660	>	if (av->lvl > al)       /* list sorted, so this works */
661	>	break;
662	>	if (av->weight < 0.9*r->rweight)
663		continue;
664		/*
665		*  Ambient radius test.
666		*/
667	<	e1 = 0.0;
668	<	for (j = 0; j < 3; j++) {
191	<	d = av->pos[j] - r->rop[j];
192	<	e1 += d * d;
193	<	}
194	<	e1 /= av->rad * av->rad;
667	>	VSUB(ck0, av->pos, r->rop);
668	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
669		if (e1 > ambacc*ambacc*1.21)
670		continue;
671		/*
672	<	*  Normal direction test.
672	>	*  Direction test using closest normal.
673		*/
674	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
675	<	if (e2 < 0.0) e2 = 0.0;
676	<	if (e1 + e2 > ambacc*ambacc*1.21)
674	>	d = DOT(av->dir, r->ron);
675	>	if (rn != r->ron) {
676	>	rn_dot = DOT(av->dir, rn);
677	>	if (rn_dot > 1.0-FTINY)
678	>	rn_dot = 1.0-FTINY;
679	>	if (rn_dot >= d-FTINY) {
680	>	d = rn_dot;
681	>	rn_dot = -2.0;
682	>	}
683	>	}
684	>	e2 = (1.0 - d) * r->rweight;
685	>	if (e2 < 0.0)
686	>	e2 = 0.0;
687	>	else if (e1 + e2 > ambacc*ambacc*1.21)
688		continue;
689		/*
690		*  Ray behind test.
#	Line 213 | Line 698 | double s;
698		/*
699		*  Jittering final test reduces image artifacts.
700		*/
701	<	wt = sqrt(e1) + sqrt(e2);
702	<	wt *= .9 + .2*urand(9015+samplendx);
703	<	if (wt > ambacc)
701	>	e1 = sqrt(e1);
702	>	e2 = sqrt(e2);
703	>	wt = e1 + e2;
704	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
705		continue;
706	+	/*
707	+	*  Recompute directional error using perturbed normal
708	+	*/
709	+	if (rn_dot > 0.0) {
710	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
711	+	wt = e1 + e2;
712	+	}
713		if (wt <= 1e-3)
714		wt = 1e3;
715		else
716		wt = 1.0 / wt;
717		wsum += wt;
718	<	extambient(ct, av, r->rop, r->ron);
718	>	extambient(ct, av, r->rop, rn);
719		scalecolor(ct, wt);
720		addcolor(acol, ct);
721		}
#	Line 241 | Line 734 | double s;
734		break;
735		}
736		if (j == 3)
737	<	wsum += sumambient(acol, r, al, at->kid+i, ck0, s);
737	>	wsum += sumambient(acol, r, rn, al,
738	>	at->kid+i, ck0, s);
739		}
740		return(wsum);
741		}
742
743
744	<	double
745	<	makeambient(acol, r, al)        /* make a new ambient value */
746	<	COLOR  acol;
747	<	register RAY  *r;
748	<	int  al;
744	>	static double
745	>	makeambient(            /* make a new ambient value for storage */
746	>	COLOR  acol,
747	>	RAY  *r,
748	>	FVECT  rn,
749	>	int  al
750	>	)
751		{
752		AMBVAL  amb;
753		FVECT   gp, gd;
754	<	/* compute weight */
755	<	amb.weight = pow(AVGREFL, (double)al);
756	<	if (r->rweight < 0.2*amb.weight)        /* heuristic */
757	<	amb.weight = r->rweight;
754	>	int     i;
755	>
756	>	amb.weight = 1.0;                       /* compute weight */
757	>	for (i = al; i-- > 0; )
758	>	amb.weight *= AVGREFL;
759	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
760	>	amb.weight = 1.25*r->rweight;
761	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
762		/* compute ambient */
763		amb.rad = doambient(acol, r, amb.weight, gp, gd);
764	<	if (amb.rad == 0.0)
764	>	if (amb.rad <= FTINY) {
765	>	setcolor(acol, 0.0, 0.0, 0.0);
766		return(0.0);
767	<	/* store it */
767	>	}
768	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
769	>	/* store value */
770		VCOPY(amb.pos, r->rop);
771		VCOPY(amb.dir, r->ron);
772		amb.lvl = al;
#	Line 272 | Line 775 | int  al;
775		VCOPY(amb.gdir, gd);
776		/* insert into tree */
777		avsave(&amb);                           /* and save to file */
778	+	if (rn != r->ron)
779	+	extambient(acol, &amb, r->rop, rn);     /* texture */
780		return(amb.rad);
781		}
782
783
784	<	extambient(cr, ap, pv, nv)              /* extrapolate value at pv, nv */
785	<	COLOR  cr;
786	<	register AMBVAL  *ap;
787	<	FVECT  pv, nv;
784	>	static void
785	>	extambient(             /* extrapolate value at pv, nv */
786	>	COLOR  cr,
787	>	AMBVAL   *ap,
788	>	FVECT  pv,
789	>	FVECT  nv
790	>	)
791		{
792	<	FVECT  v1, v2;
793	<	register int  i;
792	>	FVECT  v1;
793	>	int  i;
794		double  d;
795
796		d = 1.0;                        /* zeroeth order */
#	Line 290 | Line 798 | FVECT  pv, nv;
798		for (i = 0; i < 3; i++)
799		d += ap->gpos[i]*(pv[i]-ap->pos[i]);
800		/* gradient due to rotation */
801	<	VCOPY(v1, ap->dir);
802	<	fcross(v2, v1, nv);
295	<	d += DOT(ap->gdir, v2);
801	>	VCROSS(v1, ap->dir, nv);
802	>	d += DOT(ap->gdir, v1);
803		if (d <= 0.0) {
804		setcolor(cr, 0.0, 0.0, 0.0);
805		return;
#	Line 302 | Line 809 | FVECT  pv, nv;
809		}
810
811
812	<	static
813	<	initambfile(creat)              /* initialize ambient file */
814	<	int  creat;
812	>	static void
813	>	avinsert(                               /* insert ambient value in our tree */
814	>	AMBVAL *av
815	>	)
816		{
817	<	extern char  *progname, *octname, VersionID[];
817	>	AMBTREE  *at;
818	>	AMBVAL  *ap;
819	>	AMBVAL  avh;
820	>	FVECT  ck0;
821	>	double  s;
822	>	int  branch;
823	>	int  i;
824
825	<	#ifdef MSDOS
826	<	setmode(fileno(ambfp), O_BINARY);
825	>	if (av->rad <= FTINY)
826	>	error(CONSISTENCY, "zero ambient radius in avinsert");
827	>	at = &atrunk;
828	>	VCOPY(ck0, thescene.cuorg);
829	>	s = thescene.cusize;
830	>	while (s*(OCTSCALE/2) > av->rad*ambacc) {
831	>	if (at->kid == NULL)
832	>	if ((at->kid = newambtree()) == NULL)
833	>	error(SYSTEM, "out of memory in avinsert");
834	>	s *= 0.5;
835	>	branch = 0;
836	>	for (i = 0; i < 3; i++)
837	>	if (av->pos[i] > ck0[i] + s) {
838	>	ck0[i] += s;
839	>	branch |= 1 << i;
840	>	}
841	>	at = at->kid + branch;
842	>	}
843	>	avh.next = at->alist;           /* order by increasing level */
844	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
845	>	if (ap->next->lvl >= av->lvl)
846	>	break;
847	>	av->next = ap->next;
848	>	ap->next = (AMBVAL*)av;
849	>	at->alist = avh.next;
850	>	}
851	>
852	>	#endif  /* ! NEWAMB */
853	>
854	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
855	>
856	>	static void
857	>	initambfile(            /* initialize ambient file */
858	>	int  cre8
859	>	)
860	>	{
861	>	extern char  *progname, *octname;
862	>	static char  *mybuf = NULL;
863	>
864	>	#ifdef  F_SETLKW
865	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
866		#endif
867	<	setbuf(ambfp, bmalloc(BUFSIZ));
868	<	if (creat) {                    /* new file */
869	<	fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ",
867	>	SET_FILE_BINARY(ambfp);
868	>	if (mybuf == NULL)
869	>	mybuf = (char *)bmalloc(BUFSIZ+8);
870	>	setbuf(ambfp, mybuf);
871	>	if (cre8) {                     /* new file */
872	>	newheader("RADIANCE", ambfp);
873	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
874		progname, colval(ambval,RED),
875		colval(ambval,GRN), colval(ambval,BLU),
876	<	ambounce, ambacc);
877	<	fprintf(ambfp, "-ad %d -as %d -ar %d %s\n",
878	<	ambdiv, ambssamp, ambres,
879	<	octname==NULL ? "" : octname);
876	>	ambvwt, ambounce, ambacc);
877	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
878	>	ambdiv, ambssamp, ambres);
879	>	if (octname != NULL)
880	>	fputs(octname, ambfp);
881	>	fputc('\n', ambfp);
882		fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
883	+	fputnow(ambfp);
884		fputformat(AMBFMT, ambfp);
885	<	putc('\n', ambfp);
885	>	fputc('\n', ambfp);
886		putambmagic(ambfp);
887		} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
888		error(USER, "bad ambient file");
889		}
890
891
892	<	static
893	<	avsave(av)                              /* insert and save an ambient value */
894	<	AMBVAL  *av;
892	>	static void
893	>	avsave(                         /* insert and save an ambient value */
894	>	AMBVAL  *av
895	>	)
896		{
897	<	avinsert(av, &atrunk, thescene.cuorg, thescene.cusize);
897	>	avinsert(avstore(av));
898		if (ambfp == NULL)
899		return;
900		if (writambval(av, ambfp) < 0)
#	Line 343 | Line 904 | AMBVAL *av;
904		goto writerr;
905		return;
906		writerr:
907	<	error(SYSTEM, "error writing ambient file");
907	>	error(SYSTEM, "error writing to ambient file");
908		}
909
910
911	<	static
912	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
913	<	AMBVAL  *aval;
914	<	register AMBTREE  *at;
354	<	FVECT  c0;
355	<	double  s;
911	>	static AMBVAL *
912	>	avstore(                                /* allocate memory and store aval */
913	>	AMBVAL  *aval
914	>	)
915		{
916	<	FVECT  ck0;
917	<	int  branch;
359	<	register AMBVAL  *av;
360	<	register int  i;
916	>	AMBVAL  *av;
917	>	double  d;
918
919		if ((av = newambval()) == NULL)
920	<	goto memerr;
921	<	copystruct(av, aval);
922	<	VCOPY(ck0, c0);
923	<	while (s*(OCTSCALE/2) > av->rad*ambacc) {
924	<	if (at->kid == NULL)
925	<	if ((at->kid = newambtree()) == NULL)
926	<	goto memerr;
927	<	s *= 0.5;
928	<	branch = 0;
929	<	for (i = 0; i < 3; i++)
930	<	if (av->pos[i] > ck0[i] + s) {
931	<	ck0[i] += s;
932	<	branch |= 1 << i;
920	>	error(SYSTEM, "out of memory in avstore");
921	>	*av = *aval;
922	>	av->latick = ambclock;
923	>	av->next = NULL;
924	>	nambvals++;
925	>	d = bright(av->val);
926	>	if (d > FTINY) {                /* add to log sum for averaging */
927	>	avsum += log(d);
928	>	navsum++;
929	>	}
930	>	return(av);
931	>	}
932	>
933	>
934	>	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
935	>
936	>	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
937	>
938	>
939	>	static AMBTREE *
940	>	newambtree(void)                                /* allocate 8 ambient tree structs */
941	>	{
942	>	AMBTREE  *atp, *upperlim;
943	>
944	>	if (atfreelist == NULL) {       /* get more nodes */
945	>	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
946	>	if (atfreelist == NULL)
947	>	return(NULL);
948	>	/* link new free list */
949	>	upperlim = atfreelist + 8*(ATALLOCSZ-1);
950	>	for (atp = atfreelist; atp < upperlim; atp += 8)
951	>	atp->kid = atp + 8;
952	>	atp->kid = NULL;
953	>	}
954	>	atp = atfreelist;
955	>	atfreelist = atp->kid;
956	>	memset((char *)atp, '\0', 8*sizeof(AMBTREE));
957	>	return(atp);
958	>	}
959	>
960	>
961	>	static void
962	>	freeambtree(                    /* free 8 ambient tree structs */
963	>	AMBTREE  *atp
964	>	)
965	>	{
966	>	atp->kid = atfreelist;
967	>	atfreelist = atp;
968	>	}
969	>
970	>
971	>	static void
972	>	unloadatree(                    /* unload an ambient value tree */
973	>	AMBTREE  *at,
974	>	unloadtf_t *f
975	>	)
976	>	{
977	>	AMBVAL  *av;
978	>	int  i;
979	>	/* transfer values at this node */
980	>	for (av = at->alist; av != NULL; av = at->alist) {
981	>	at->alist = av->next;
982	>	(*f)(av);
983	>	}
984	>	if (at->kid == NULL)
985	>	return;
986	>	for (i = 0; i < 8; i++)         /* transfer and free children */
987	>	unloadatree(at->kid+i, f);
988	>	freeambtree(at->kid);
989	>	at->kid = NULL;
990	>	}
991	>
992	>
993	>	static struct avl {
994	>	AMBVAL  *p;
995	>	unsigned long   t;
996	>	}       *avlist1;                       /* ambient value list with ticks */
997	>	static AMBVAL   **avlist2;              /* memory positions for sorting */
998	>	static int      i_avlist;               /* index for lists */
999	>
1000	>	static int alatcmp(const void *av1, const void *av2);
1001	>
1002	>	static void
1003	>	avfree(AMBVAL *av)
1004	>	{
1005	>	free(av);
1006	>	}
1007	>
1008	>	static void
1009	>	av2list(
1010	>	AMBVAL *av
1011	>	)
1012	>	{
1013	>	#ifdef DEBUG
1014	>	if (i_avlist >= nambvals)
1015	>	error(CONSISTENCY, "too many ambient values in av2list1");
1016	>	#endif
1017	>	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1018	>	avlist1[i_avlist++].t = av->latick;
1019	>	}
1020	>
1021	>
1022	>	static int
1023	>	alatcmp(                        /* compare ambient values for MRA */
1024	>	const void *av1,
1025	>	const void *av2
1026	>	)
1027	>	{
1028	>	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1029	>	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1030	>	}
1031	>
1032	>
1033	>	/* GW NOTE 2002/10/3:
1034	>	* I used to compare AMBVAL pointers, but found that this was the
1035	>	* cause of a serious consistency error with gcc, since the optimizer
1036	>	* uses some dangerous trick in pointer subtraction that
1037	>	* assumes pointers differ by exact struct size increments.
1038	>	*/
1039	>	static int
1040	>	aposcmp(                        /* compare ambient value positions */
1041	>	const void      *avp1,
1042	>	const void      *avp2
1043	>	)
1044	>	{
1045	>	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1046	>	if (diff < 0)
1047	>	return(-1);
1048	>	return(diff > 0);
1049	>	}
1050	>
1051	>
1052	>	static int
1053	>	avlmemi(                                /* find list position from address */
1054	>	AMBVAL  *avaddr
1055	>	)
1056	>	{
1057	>	AMBVAL  **avlpp;
1058	>
1059	>	avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2,
1060	>	nambvals, sizeof(AMBVAL *), &aposcmp);
1061	>	if (avlpp == NULL)
1062	>	error(CONSISTENCY, "address not found in avlmemi");
1063	>	return(avlpp - avlist2);
1064	>	}
1065	>
1066	>
1067	>	static void
1068	>	sortambvals(                    /* resort ambient values */
1069	>	int     always
1070	>	)
1071	>	{
1072	>	AMBTREE  oldatrunk;
1073	>	AMBVAL  tav, *tap, *pnext;
1074	>	int     i, j;
1075	>	/* see if it's time yet */
1076	>	if (!always && (ambclock++ < lastsort+sortintvl ||
1077	>	nambvals < SORT_THRESH))
1078	>	return;
1079	>	/*
1080	>	* The idea here is to minimize memory thrashing
1081	>	* in VM systems by improving reference locality.
1082	>	* We do this by periodically sorting our stored ambient
1083	>	* values in memory in order of most recently to least
1084	>	* recently accessed.  This ordering was chosen so that new
1085	>	* ambient values (which tend to be less important) go into
1086	>	* higher memory with the infrequently accessed values.
1087	>	*      Since we expect our values to need sorting less
1088	>	* frequently as the process continues, we double our
1089	>	* waiting interval after each call.
1090	>	*      This routine is also called by setambacc() with
1091	>	* the "always" parameter set to 1 so that the ambient
1092	>	* tree will be rebuilt with the new accuracy parameter.
1093	>	*/
1094	>	if (tracktime) {                /* allocate pointer arrays to sort */
1095	>	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1096	>	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1097	>	} else {
1098	>	avlist2 = NULL;
1099	>	avlist1 = NULL;
1100	>	}
1101	>	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1102	>	if (avlist2 != NULL)
1103	>	free((void *)avlist2);
1104	>	if (always) {           /* rebuild without sorting */
1105	>	oldatrunk = atrunk;
1106	>	atrunk.alist = NULL;
1107	>	atrunk.kid = NULL;
1108	>	unloadatree(&oldatrunk, &avinsert);
1109	>	}
1110	>	} else {                        /* sort memory by last access time */
1111	>	/*
1112	>	* Sorting memory is tricky because it isn't contiguous.
1113	>	* We have to sort an array of pointers by MRA and also
1114	>	* by memory position.  We then copy values in "loops"
1115	>	* to minimize memory hits.  Nevertheless, we will visit
1116	>	* everyone at least twice, and this is an expensive process
1117	>	* when we're thrashing, which is when we need to do it.
1118	>	*/
1119	>	#ifdef DEBUG
1120	>	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1121	>	nambvals, ambclock);
1122	>	eputs(errmsg);
1123	>	#endif
1124	>	i_avlist = 0;
1125	>	unloadatree(&atrunk, &av2list); /* empty current tree */
1126	>	#ifdef DEBUG
1127	>	if (i_avlist < nambvals)
1128	>	error(CONSISTENCY, "missing ambient values in sortambvals");
1129	>	#endif
1130	>	qsort((char *)avlist1, nambvals, sizeof(struct avl), &alatcmp);
1131	>	qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), &aposcmp);
1132	>	for (i = 0; i < nambvals; i++) {
1133	>	if (avlist1[i].p == NULL)
1134	>	continue;
1135	>	tap = avlist2[i];
1136	>	tav = *tap;
1137	>	for (j = i; (pnext = avlist1[j].p) != tap;
1138	>	j = avlmemi(pnext)) {
1139	>	*(avlist2[j]) = *pnext;
1140	>	avinsert(avlist2[j]);
1141	>	avlist1[j].p = NULL;
1142		}
1143	<	at = at->kid + branch;
1143	>	*(avlist2[j]) = tav;
1144	>	avinsert(avlist2[j]);
1145	>	avlist1[j].p = NULL;
1146	>	}
1147	>	free((void *)avlist1);
1148	>	free((void *)avlist2);
1149	>	/* compute new sort interval */
1150	>	sortintvl = ambclock - lastsort;
1151	>	if (sortintvl >= MAX_SORT_INTVL/2)
1152	>	sortintvl = MAX_SORT_INTVL;
1153	>	else
1154	>	sortintvl <<= 1;        /* wait twice as long next */
1155	>	#ifdef DEBUG
1156	>	eputs("done\n");
1157	>	#endif
1158		}
1159	<	av->next = at->alist;
1160	<	at->alist = av;
1161	<	return;
382	<	memerr:
383	<	error(SYSTEM, "out of memory in avinsert");
1159	>	if (ambclock >= MAXACLOCK)
1160	>	ambclock = MAXACLOCK/2;
1161	>	lastsort = ambclock;
1162		}
1163
1164
1165	<	#ifdef  NIX
1165	>	#ifdef  F_SETLKW
1166
1167	<	int
1168	<	ambsync()                       /* flush ambient file */
1167	>	static void
1168	>	aflock(                 /* lock/unlock ambient file */
1169	>	int  typ
1170	>	)
1171		{
1172	<	if (nunflshed == 0)
1173	<	return(0);
1174	<	nunflshed = 0;
1175	<	return(fflush(ambfp));
1172	>	static struct flock  fls;       /* static so initialized to zeroes */
1173	>
1174	>	if (typ == fls.l_type)          /* already called? */
1175	>	return;
1176	>	fls.l_type = typ;
1177	>	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1178	>	error(SYSTEM, "cannot (un)lock ambient file");
1179		}
1180
398	–	#else
1181
1182		int
1183	<	ambsync()                       /* synchronize ambient file */
1183	>	ambsync(void)                   /* synchronize ambient file */
1184		{
403	–	static FILE  *ambinp = NULL;
404	–	static long  lastpos = -1;
405	–	struct flock  fls;
1185		long  flen;
1186		AMBVAL  avs;
1187	<	register int  n;
1187	>	int  n;
1188
1189	<	if (nunflshed == 0)
1189	>	if (ambfp == NULL)      /* no ambient file? */
1190		return(0);
1191	<	/* gain exclusive access */
1192	<	fls.l_type = F_WRLCK;
414	<	fls.l_whence = 0;
415	<	fls.l_start = 0L;
416	<	fls.l_len = 0L;
417	<	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
418	<	error(SYSTEM, "cannot lock ambient file");
419	<	if (lastpos < 0)        /* initializing */
420	<	goto syncend;
1191	>	/* gain appropriate access */
1192	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1193		/* see if file has grown */
1194	<	if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0)
1195	<	error(SYSTEM, "cannot seek on ambient file");
1196	<	if (n = flen - lastpos) {               /* file has grown */
1194	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1195	>	goto seekerr;
1196	>	if ((n = flen - lastpos) > 0) {         /* file has grown */
1197		if (ambinp == NULL) {           /* use duplicate filedes */
1198		ambinp = fdopen(dup(fileno(ambfp)), "r");
1199		if (ambinp == NULL)
1200		error(SYSTEM, "fdopen failed in ambsync");
1201		}
1202	<	if (fseek(ambinp, lastpos, 0) < 0)
1203	<	error(SYSTEM, "fseek failed in ambsync");
1202	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1203	>	goto seekerr;
1204		while (n >= AMBVALSIZ) {        /* load contributed values */
1205	<	readambval(&avs, ambinp);
1206	<	avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize);
1205	>	if (!readambval(&avs, ambinp)) {
1206	>	sprintf(errmsg,
1207	>	"ambient file \"%s\" corrupted near character %ld",
1208	>	ambfile, flen - n);
1209	>	error(WARNING, errmsg);
1210	>	break;
1211	>	}
1212	>	avinsert(avstore(&avs));
1213		n -= AMBVALSIZ;
1214		}
1215	<	if (n)                          /* alignment */
1216	<	lseek(fileno(ambfp), flen-n, 0);
1215	>	lastpos = flen - n;
1216	>	/*** seek always as safety measure
1217	>	if (n) ***/                     /* alignment */
1218	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1219	>	goto seekerr;
1220		}
440	–	syncend:
1221		n = fflush(ambfp);                      /* calls write() at last */
1222	<	lastpos = lseek(fileno(ambfp), 0L, 1);
1223	<	fls.l_type = F_UNLCK;                   /* release file */
1224	<	fcntl(fileno(ambfp), F_SETLKW, &fls);
1222	>	if (n != EOF)
1223	>	lastpos += (long)nunflshed*AMBVALSIZ;
1224	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1225	>	goto seekerr;
1226	>
1227	>	aflock(F_UNLCK);                        /* release file */
1228		nunflshed = 0;
1229		return(n);
1230	+	seekerr:
1231	+	error(SYSTEM, "seek failed in ambsync");
1232	+	return -1; /* pro forma return */
1233		}
1234
1235	<	#endif
1235	>	#else   /* ! F_SETLKW */
1236	>
1237	>	int
1238	>	ambsync(void)                   /* flush ambient file */
1239	>	{
1240	>	if (ambfp == NULL)
1241	>	return(0);
1242	>	nunflshed = 0;
1243	>	return(fflush(ambfp));
1244	>	}
1245	>
1246	>	#endif  /* ! F_SETLKW */

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