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

Comparing ray/src/rt/ambient.c (file contents):
Revision 1.14 by greg, Fri Jun 7 10:04:29 1991 UTC vs.
Revision 2.79 by greg, Fri Apr 25 00:21:52 2014 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1991 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	<	*  The macro AMBFLUSH (if defined) is the number of ambient values
11	<	*      to wait before flushing to the ambient file.
12	<	*
13	<	*     5/9/86
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"
23	–
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 {
29	<	AMBVAL  *alist;         /* ambient value list */
30	<	struct ambtree  *kid;   /* 8 child nodes */
31	<	}  AMBTREE;                     /* ambient octree */
25	>	extern char  *shm_boundary;     /* memory sharing boundary */
26
27	<	extern CUBE  thescene;          /* contains space boundaries */
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	<	#define  MAXASET        511     /* maximum number of elements in ambient set */
33	<	OBJECT  ambset[MAXASET+1]={0};  /* ambient include/exclude set */
32	>	double  maxarad;                /* maximum ambient radius */
33	>	double  minarad;                /* minimum ambient radius */
34
35	<	double  maxarad;                /* maximum ambient radius */
39	<	double  minarad;                /* minimum ambient radius */
35	>	static AMBTREE  atrunk;         /* our ambient trunk node */
36
41	–	static AMBTREE  atrunk;         /* our ambient trunk node */
42	–
37		static FILE  *ambfp = NULL;     /* ambient file pointer */
38	+	static int  nunflshed = 0;      /* number of unflushed ambient values */
39
40	<	#define  newambval()    (AMBVAL *)bmalloc(sizeof(AMBVAL))
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
47	–	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
54
55	+	static double  qambacc = 0.;            /* ambient accuracy to the 1/4 power */
56	+	static double  avsum = 0.;              /* computed ambient value sum (log) */
57	+	static unsigned int  navsum = 0;        /* number of values in avsum */
58	+	static unsigned int  nambvals = 0;      /* total number of indirect values */
59	+	static unsigned int  nambshare = 0;     /* number of values from file */
60	+	static unsigned long  ambclock = 0;     /* ambient access clock */
61	+	static unsigned long  lastsort = 0;     /* time of last value sort */
62	+	static long  sortintvl = SORT_INTVL;    /* time until next sort */
63	+	static FILE  *ambinp = NULL;            /* auxiliary file for input */
64	+	static long  lastpos = -1;              /* last flush position */
65
66	<	setambient(afile)                       /* initialize calculation */
67	<	char  *afile;
66	>	#define MAXACLOCK       (1L<<30)        /* clock turnover value */
67	>	/*
68	>	* Track access times unless we are sharing ambient values
69	>	* through memory on a multiprocessor, when we want to avoid
70	>	* claiming our own memory (copy on write).  Go ahead anyway
71	>	* if more than two thirds of our values are unshared.
72	>	* Compile with -Dtracktime=0 to turn this code off.
73	>	*/
74	>	#ifndef tracktime
75	>	#define tracktime       (shm_boundary == NULL || nambvals > 3*nambshare)
76	>	#endif
77	>
78	>	#define  AMBFLUSH       (BUFSIZ/AMBVALSIZ)
79	>
80	>	#define  newambval()    (AMBVAL *)malloc(sizeof(AMBVAL))
81	>	#define  freeav(av)     free((void *)av);
82	>
83	>	static void initambfile(int creat);
84	>	static void avsave(AMBVAL *av);
85	>	static AMBVAL *avstore(AMBVAL  *aval);
86	>	static AMBTREE *newambtree(void);
87	>	static void freeambtree(AMBTREE  *atp);
88	>
89	>	typedef void unloadtf_t(AMBVAL *);
90	>	static unloadtf_t avinsert;
91	>	static unloadtf_t av2list;
92	>	static unloadtf_t avfree;
93	>	static void unloadatree(AMBTREE  *at, unloadtf_t *f);
94	>
95	>	static int aposcmp(const void *avp1, const void *avp2);
96	>	static int avlmemi(AMBVAL *avaddr);
97	>	static void sortambvals(int always);
98	>
99	>	#ifdef  F_SETLKW
100	>	static void aflock(int  typ);
101	>	#endif
102	>
103	>
104	>	void
105	>	setambres(                              /* set ambient resolution */
106	>	int  ar
107	>	)
108		{
109	<	long  ftell();
110	<	AMBVAL  amb;
109	>	ambres = ar < 0 ? 0 : ar;               /* may be done already */
110	>	/* set min & max radii */
111	>	if (ar <= 0) {
112	>	minarad = 0;
113	>	maxarad = thescene.cusize / 2.0;
114	>	} else {
115	>	minarad = thescene.cusize / ar;
116	>	maxarad = 64 * minarad;                 /* heuristic */
117	>	if (maxarad > thescene.cusize / 2.0)
118	>	maxarad = thescene.cusize / 2.0;
119	>	}
120	>	if (minarad <= FTINY)
121	>	minarad = 10*FTINY;
122	>	if (maxarad <= minarad)
123	>	maxarad = 64 * minarad;
124	>	}
125
56	–	maxarad = thescene.cusize / 2.0;                /* maximum radius */
57	–	/* minimum radius */
58	–	minarad = ambres > 0 ? thescene.cusize/ambres : 0.0;
126
127	<	/* open ambient file */
128	<	if (afile != NULL)
129	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
130	<	while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1)
131	<	avinsert(&amb, &atrunk, thescene.cuorg,
132	<	thescene.cusize);
133	<	/* align */
134	<	fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1);
135	<	} else if ((ambfp = fopen(afile, "w")) == NULL) {
136	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
137	<	afile);
138	<	error(SYSTEM, errmsg);
127	>	void
128	>	setambacc(                              /* set ambient accuracy */
129	>	double  newa
130	>	)
131	>	{
132	>	double  ambdiff;
133	>
134	>	if (newa < 0.0)
135	>	newa = 0.0;
136	>	ambdiff = fabs(newa - ambacc);
137	>	if (ambdiff >= .01 && (ambacc = newa) > FTINY) {
138	>	qambacc = sqrt(sqrt(ambacc));
139	>	if (nambvals > 0)
140	>	sortambvals(1);         /* rebuild tree */
141	>	}
142	>	}
143	>
144	>
145	>	void
146	>	setambient(void)                                /* initialize calculation */
147	>	{
148	>	int     readonly = 0;
149	>	long    flen;
150	>	AMBVAL  amb;
151	>	/* make sure we're fresh */
152	>	ambdone();
153	>	/* init ambient limits */
154	>	setambres(ambres);
155	>	qambacc = sqrt(sqrt(ambacc *= (ambacc > FTINY)));
156	>	if (ambfile == NULL || !ambfile[0])
157	>	return;
158	>	if (ambacc <= FTINY) {
159	>	sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
160	>	ambfile);
161	>	error(WARNING, errmsg);
162	>	return;
163	>	}
164	>	/* open ambient file */
165	>	if ((ambfp = fopen(ambfile, "r+")) == NULL)
166	>	readonly = (ambfp = fopen(ambfile, "r")) != NULL;
167	>	if (ambfp != NULL) {
168	>	initambfile(0);                 /* file exists */
169	>	lastpos = ftell(ambfp);
170	>	while (readambval(&amb, ambfp))
171	>	avinsert(avstore(&amb));
172	>	nambshare = nambvals;           /* share loaded values */
173	>	if (readonly) {
174	>	sprintf(errmsg,
175	>	"loaded %u values from read-only ambient file",
176	>	nambvals);
177	>	error(WARNING, errmsg);
178	>	fclose(ambfp);          /* close file so no writes */
179	>	ambfp = NULL;
180	>	return;                 /* avoid ambsync() */
181		}
182	+	/* align file pointer */
183	+	lastpos += (long)nambvals*AMBVALSIZ;
184	+	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
185	+	if (flen != lastpos) {
186	+	sprintf(errmsg,
187	+	"ignoring last %ld values in ambient file (corrupted)",
188	+	(flen - lastpos)/AMBVALSIZ);
189	+	error(WARNING, errmsg);
190	+	fseek(ambfp, lastpos, SEEK_SET);
191	+	#ifndef _WIN32 /* XXX we need a replacement for that one */
192	+	ftruncate(fileno(ambfp), (off_t)lastpos);
193	+	#endif
194	+	}
195	+	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
196	+	initambfile(1);                 /* else create new file */
197	+	fflush(ambfp);
198	+	lastpos = ftell(ambfp);
199	+	} else {
200	+	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
201	+	error(SYSTEM, errmsg);
202	+	}
203	+	#ifdef getc_unlocked
204	+	flockfile(ambfp);                       /* application-level lock */
205	+	#endif
206	+	#ifdef  F_SETLKW
207	+	aflock(F_UNLCK);                        /* release file */
208	+	#endif
209		}
210
211
212	<	ambnotify(obj)                  /* record new modifier */
213	<	OBJECT  obj;
212	>	void
213	>	ambdone(void)                   /* close ambient file and free memory */
214		{
215	+	if (ambfp != NULL) {            /* close ambient file */
216	+	ambsync();
217	+	fclose(ambfp);
218	+	ambfp = NULL;
219	+	if (ambinp != NULL) {
220	+	fclose(ambinp);
221	+	ambinp = NULL;
222	+	}
223	+	lastpos = -1;
224	+	}
225	+	/* free ambient tree */
226	+	unloadatree(&atrunk, &avfree);
227	+	/* reset state variables */
228	+	avsum = 0.;
229	+	navsum = 0;
230	+	nambvals = 0;
231	+	nambshare = 0;
232	+	ambclock = 0;
233	+	lastsort = 0;
234	+	sortintvl = SORT_INTVL;
235	+	}
236	+
237	+
238	+	void
239	+	ambnotify(                      /* record new modifier */
240	+	OBJECT  obj
241	+	)
242	+	{
243		static int  hitlimit = 0;
244	<	register OBJREC  *o = objptr(obj);
245	<	register char  **amblp;
244	>	OBJREC   *o;
245	>	char  **amblp;
246
247	+	if (obj == OVOID) {             /* starting over */
248	+	ambset[0] = 0;
249	+	hitlimit = 0;
250	+	return;
251	+	}
252	+	o = objptr(obj);
253		if (hitlimit || !ismodifier(o->otype))
254		return;
255		for (amblp = amblist; *amblp != NULL; amblp++)
#	Line 94 | Line 264 | OBJECT  obj;
264		}
265		}
266
267	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
268
269	<	ambient(acol, r)                /* compute ambient component for ray */
270	<	COLOR  acol;
271	<	register RAY  *r;
269	>	#ifdef NEWAMB
270	>
271	>	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
272	>
273	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
274	>	AMBTREE *at, FVECT c0, double s);
275	>	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
276	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
277	>	FVECT uvw[3]);
278	>
279	>	void
280	>	multambient(            /* compute ambient component & multiply by coef. */
281	>	COLOR  aval,
282	>	RAY  *r,
283	>	FVECT  nrm
284	>	)
285		{
286		static int  rdepth = 0;                 /* ambient recursion */
287	<	double  wsum;
287	>	COLOR   acol;
288	>	int     ok;
289	>	double  d, l;
290
105	–	rdepth++;                               /* increment level */
106	–
291		if (ambdiv <= 0)                        /* no ambient calculation */
292		goto dumbamb;
293		/* check number of bounces */
294	<	if (rdepth > ambounce)
294	>	if (rdepth >= ambounce)
295		goto dumbamb;
296		/* check ambient list */
297		if (ambincl != -1 && r->ro != NULL &&
#	Line 115 | Line 299 | register RAY  *r;
299		goto dumbamb;
300
301		if (ambacc <= FTINY) {                  /* no ambient storage */
302	<	if (doambient(acol, r, NULL, NULL) == 0.0)
302	>	copycolor(acol, aval);
303	>	rdepth++;
304	>	ok = doambient(acol, r, r->rweight, NULL, NULL, NULL, NULL);
305	>	rdepth--;
306	>	if (!ok)
307		goto dumbamb;
308	<	goto done;
308	>	copycolor(aval, acol);
309	>	return;
310		}
311	<	/* get ambient value */
311	>
312	>	if (tracktime)                          /* sort to minimize thrashing */
313	>	sortambvals(0);
314	>	/* interpolate ambient value */
315		setcolor(acol, 0.0, 0.0, 0.0);
316	<	wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize);
317	<	if (wsum > FTINY)
318	<	scalecolor(acol, 1.0/wsum);
319	<	else if (makeambient(acol, r) == 0.0)
316	>	d = sumambient(acol, r, nrm, rdepth,
317	>	&atrunk, thescene.cuorg, thescene.cusize);
318	>	if (d > FTINY) {
319	>	d = 1.0/d;
320	>	scalecolor(acol, d);
321	>	multcolor(aval, acol);
322	>	return;
323	>	}
324	>	rdepth++;                               /* need to cache new value */
325	>	ok = makeambient(acol, r, nrm, rdepth-1);
326	>	rdepth--;
327	>	if (ok) {
328	>	multcolor(aval, acol);          /* computed new value */
329	>	return;
330	>	}
331	>	dumbamb:                                        /* return global value */
332	>	if ((ambvwt <= 0) | (navsum == 0)) {
333	>	multcolor(aval, ambval);
334	>	return;
335	>	}
336	>	l = bright(ambval);                     /* average in computations */
337	>	if (l > FTINY) {
338	>	d = (log(l)*(double)ambvwt + avsum) /
339	>	(double)(ambvwt + navsum);
340	>	d = exp(d) / l;
341	>	scalecolor(aval, d);
342	>	multcolor(aval, ambval);        /* apply color of ambval */
343	>	} else {
344	>	d = exp( avsum / (double)navsum );
345	>	scalecolor(aval, d);            /* neutral color */
346	>	}
347	>	}
348	>
349	>
350	>	double
351	>	sumambient(             /* get interpolated ambient value */
352	>	COLOR  acol,
353	>	RAY  *r,
354	>	FVECT  rn,
355	>	int  al,
356	>	AMBTREE  *at,
357	>	FVECT  c0,
358	>	double  s
359	>	)
360	>	{                       /* initial limit is 5 degrees plus ambacc radians */
361	>	const double    minangle = 5.0 * PI/180.;
362	>	const double    maxangle = (minangle+ambacc-PI/2.)*pow(r->rweight,0.13)
363	>	+ PI/2.;
364	>	double          wsum = 0.0;
365	>	FVECT           ck0;
366	>	int             i, j;
367	>	AMBVAL          *av;
368	>	/* sum this node */
369	>	for (av = at->alist; av != NULL; av = av->next) {
370	>	double  d, delta_r2, delta_t2;
371	>	COLOR   ct;
372	>	FVECT   uvw[3];
373	>	/* record access */
374	>	if (tracktime)
375	>	av->latick = ambclock;
376	>	/*
377	>	*  Ambient level test
378	>	*/
379	>	if (av->lvl > al)       /* list sorted, so this works */
380	>	break;
381	>	if (av->weight < 0.9*r->rweight)
382	>	continue;
383	>	/*
384	>	*  Direction test using unperturbed normal
385	>	*/
386	>	decodedir(uvw[2], av->ndir);
387	>	d = DOT(uvw[2], r->ron);
388	>	if (d <= 0.0)           /* >= 90 degrees */
389	>	continue;
390	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
391	>	if (delta_r2 >= maxangle*maxangle)
392	>	continue;
393	>	/*
394	>	*  Elliptical radii test based on Hessian
395	>	*/
396	>	decodedir(uvw[0], av->udir);
397	>	VCROSS(uvw[1], uvw[2], uvw[0]);
398	>	VSUB(ck0, av->pos, r->rop);
399	>	d = DOT(ck0, uvw[0]) / av->rad[0];
400	>	delta_t2 = d*d;
401	>	d = DOT(ck0, uvw[1]) / av->rad[1];
402	>	delta_t2 += d*d;
403	>	if (delta_t2 >= qambacc*qambacc)
404	>	continue;
405	>	/*
406	>	*  Intersection behind test
407	>	*/
408	>	d = 0.0;
409	>	for (j = 0; j < 3; j++)
410	>	d += (r->rop[j] - av->pos[j])*(uvw[2][j] + r->ron[j]);
411	>	if (d*0.5 < -minarad*qambacc-.001)
412	>	continue;
413	>	/*
414	>	*  Extrapolate value and compute final weight (hat function)
415	>	*/
416	>	extambient(ct, av, r->rop, rn, uvw);
417	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
418	>	tfunc(qambacc, sqrt(delta_t2), 0.0);
419	>	scalecolor(ct, d);
420	>	addcolor(acol, ct);
421	>	wsum += d;
422	>	}
423	>	if (at->kid == NULL)
424	>	return(wsum);
425	>	/* sum children */
426	>	s *= 0.5;
427	>	for (i = 0; i < 8; i++) {
428	>	for (j = 0; j < 3; j++) {
429	>	ck0[j] = c0[j];
430	>	if (1<<j & i)
431	>	ck0[j] += s;
432	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
433	>	break;
434	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
435	>	break;
436	>	}
437	>	if (j == 3)
438	>	wsum += sumambient(acol, r, rn, al,
439	>	at->kid+i, ck0, s);
440	>	}
441	>	return(wsum);
442	>	}
443	>
444	>
445	>	int
446	>	makeambient(            /* make a new ambient value for storage */
447	>	COLOR  acol,
448	>	RAY  *r,
449	>	FVECT  rn,
450	>	int  al
451	>	)
452	>	{
453	>	AMBVAL  amb;
454	>	FVECT   uvw[3];
455	>	int     i;
456	>
457	>	amb.weight = 1.0;                       /* compute weight */
458	>	for (i = al; i-- > 0; )
459	>	amb.weight *= AVGREFL;
460	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
461	>	amb.weight = 1.25*r->rweight;
462	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
463	>	/* compute ambient */
464	>	i = doambient(acol, r, amb.weight, uvw, amb.rad, amb.gpos, amb.gdir);
465	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
466	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
467	>	return(i);
468	>	/* store value */
469	>	VCOPY(amb.pos, r->rop);
470	>	amb.ndir = encodedir(r->ron);
471	>	amb.udir = encodedir(uvw[0]);
472	>	amb.lvl = al;
473	>	copycolor(amb.val, acol);
474	>	/* insert into tree */
475	>	avsave(&amb);                           /* and save to file */
476	>	if (rn != r->ron) {                     /* texture */
477	>	VCOPY(uvw[2], r->ron);
478	>	extambient(acol, &amb, r->rop, rn, uvw);
479	>	}
480	>	return(1);
481	>	}
482	>
483	>
484	>	void
485	>	extambient(             /* extrapolate value at pv, nv */
486	>	COLOR  cr,
487	>	AMBVAL   *ap,
488	>	FVECT  pv,
489	>	FVECT  nv,
490	>	FVECT  uvw[3]
491	>	)
492	>	{
493	>	static FVECT    my_uvw[3];
494	>	FVECT           v1;
495	>	int             i;
496	>	double          d = 1.0;        /* zeroeth order */
497	>
498	>	if (uvw == NULL) {              /* need local coordinates? */
499	>	decodedir(my_uvw[2], ap->ndir);
500	>	decodedir(my_uvw[0], ap->udir);
501	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
502	>	uvw = my_uvw;
503	>	}
504	>	for (i = 3; i--; )              /* gradient due to translation */
505	>	d += (pv[i] - ap->pos[i]) *
506	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
507	>
508	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
509	>	for (i = 3; i--; )
510	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
511	>
512	>	if (d <= 0.0) {
513	>	setcolor(cr, 0.0, 0.0, 0.0);
514	>	return;
515	>	}
516	>	copycolor(cr, ap->val);
517	>	scalecolor(cr, d);
518	>	}
519	>
520	>
521	>	static void
522	>	avinsert(                               /* insert ambient value in our tree */
523	>	AMBVAL *av
524	>	)
525	>	{
526	>	AMBTREE  *at;
527	>	AMBVAL  *ap;
528	>	AMBVAL  avh;
529	>	FVECT  ck0;
530	>	double  s;
531	>	int  branch;
532	>	int  i;
533	>
534	>	if (av->rad[0] <= FTINY)
535	>	error(CONSISTENCY, "zero ambient radius in avinsert");
536	>	at = &atrunk;
537	>	VCOPY(ck0, thescene.cuorg);
538	>	s = thescene.cusize;
539	>	while (s*(OCTSCALE/2) > av->rad[1]*qambacc) {
540	>	if (at->kid == NULL)
541	>	if ((at->kid = newambtree()) == NULL)
542	>	error(SYSTEM, "out of memory in avinsert");
543	>	s *= 0.5;
544	>	branch = 0;
545	>	for (i = 0; i < 3; i++)
546	>	if (av->pos[i] > ck0[i] + s) {
547	>	ck0[i] += s;
548	>	branch |= 1 << i;
549	>	}
550	>	at = at->kid + branch;
551	>	}
552	>	avh.next = at->alist;           /* order by increasing level */
553	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
554	>	if (ap->next->lvl >= av->lvl)
555	>	break;
556	>	av->next = ap->next;
557	>	ap->next = (AMBVAL*)av;
558	>	at->alist = avh.next;
559	>	}
560	>
561	>
562	>	#else /* ! NEWAMB */
563	>
564	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
565	>	AMBTREE *at, FVECT c0, double s);
566	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
567	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
568	>
569	>
570	>	void
571	>	multambient(            /* compute ambient component & multiply by coef. */
572	>	COLOR  aval,
573	>	RAY  *r,
574	>	FVECT  nrm
575	>	)
576	>	{
577	>	static int  rdepth = 0;                 /* ambient recursion */
578	>	COLOR   acol;
579	>	double  d, l;
580	>
581	>	if (ambdiv <= 0)                        /* no ambient calculation */
582		goto dumbamb;
583	<	goto done;
583	>	/* check number of bounces */
584	>	if (rdepth >= ambounce)
585	>	goto dumbamb;
586	>	/* check ambient list */
587	>	if (ambincl != -1 && r->ro != NULL &&
588	>	ambincl != inset(ambset, r->ro->omod))
589	>	goto dumbamb;
590
591	<	dumbamb:                                        /* return global value */
592	<	copycolor(acol, ambval);
593	<	done:                                           /* must finish here! */
591	>	if (ambacc <= FTINY) {                  /* no ambient storage */
592	>	copycolor(acol, aval);
593	>	rdepth++;
594	>	d = doambient(acol, r, r->rweight, NULL, NULL);
595	>	rdepth--;
596	>	if (d <= FTINY)
597	>	goto dumbamb;
598	>	copycolor(aval, acol);
599	>	return;
600	>	}
601	>
602	>	if (tracktime)                          /* sort to minimize thrashing */
603	>	sortambvals(0);
604	>	/* interpolate ambient value */
605	>	setcolor(acol, 0.0, 0.0, 0.0);
606	>	d = sumambient(acol, r, nrm, rdepth,
607	>	&atrunk, thescene.cuorg, thescene.cusize);
608	>	if (d > FTINY) {
609	>	d = 1.0/d;
610	>	scalecolor(acol, d);
611	>	multcolor(aval, acol);
612	>	return;
613	>	}
614	>	rdepth++;                               /* need to cache new value */
615	>	d = makeambient(acol, r, nrm, rdepth-1);
616		rdepth--;
617	+	if (d > FTINY) {
618	+	multcolor(aval, acol);          /* got new value */
619	+	return;
620	+	}
621	+	dumbamb:                                        /* return global value */
622	+	if ((ambvwt <= 0) | (navsum == 0)) {
623	+	multcolor(aval, ambval);
624	+	return;
625	+	}
626	+	l = bright(ambval);                     /* average in computations */
627	+	if (l > FTINY) {
628	+	d = (log(l)*(double)ambvwt + avsum) /
629	+	(double)(ambvwt + navsum);
630	+	d = exp(d) / l;
631	+	scalecolor(aval, d);
632	+	multcolor(aval, ambval);        /* apply color of ambval */
633	+	} else {
634	+	d = exp( avsum / (double)navsum );
635	+	scalecolor(aval, d);            /* neutral color */
636	+	}
637		}
638
639
640	<	double
641	<	sumambient(acol, r, at, c0, s)          /* get interpolated ambient value */
642	<	COLOR  acol;
643	<	register RAY  *r;
644	<	AMBTREE  *at;
645	<	FVECT  c0;
646	<	double  s;
640	>	static double
641	>	sumambient(     /* get interpolated ambient value */
642	>	COLOR  acol,
643	>	RAY  *r,
644	>	FVECT  rn,
645	>	int  al,
646	>	AMBTREE  *at,
647	>	FVECT  c0,
648	>	double  s
649	>	)
650		{
651	<	extern double  sqrt();
147	<	double  d, e1, e2, wt, wsum;
651	>	double  d, e1, e2, wt, wsum;
652		COLOR  ct;
653		FVECT  ck0;
654		int  i;
655	<	register int  j;
656	<	register AMBVAL  *av;
657	<	/* do this node */
655	>	int  j;
656	>	AMBVAL   *av;
657	>
658		wsum = 0.0;
659	+	/* do this node */
660		for (av = at->alist; av != NULL; av = av->next) {
661	+	double  rn_dot = -2.0;
662	+	if (tracktime)
663	+	av->latick = ambclock;
664		/*
665	<	*  Ray strength test.
665	>	*  Ambient level test.
666		*/
667	<	if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY)
667	>	if (av->lvl > al)       /* list sorted, so this works */
668	>	break;
669	>	if (av->weight < 0.9*r->rweight)
670		continue;
671		/*
672		*  Ambient radius test.
673		*/
674	<	e1 = 0.0;
675	<	for (j = 0; j < 3; j++) {
166	<	d = av->pos[j] - r->rop[j];
167	<	e1 += d * d;
168	<	}
169	<	e1 /= av->rad * av->rad;
674	>	VSUB(ck0, av->pos, r->rop);
675	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
676		if (e1 > ambacc*ambacc*1.21)
677		continue;
678		/*
679	<	*  Normal direction test.
679	>	*  Direction test using closest normal.
680		*/
681	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
682	<	if (e2 < 0.0) e2 = 0.0;
683	<	if (e1 + e2 > ambacc*ambacc*1.21)
681	>	d = DOT(av->dir, r->ron);
682	>	if (rn != r->ron) {
683	>	rn_dot = DOT(av->dir, rn);
684	>	if (rn_dot > 1.0-FTINY)
685	>	rn_dot = 1.0-FTINY;
686	>	if (rn_dot >= d-FTINY) {
687	>	d = rn_dot;
688	>	rn_dot = -2.0;
689	>	}
690	>	}
691	>	e2 = (1.0 - d) * r->rweight;
692	>	if (e2 < 0.0)
693	>	e2 = 0.0;
694	>	else if (e1 + e2 > ambacc*ambacc*1.21)
695		continue;
696		/*
697		*  Ray behind test.
#	Line 183 | Line 700 | double  s;
700		for (j = 0; j < 3; j++)
701		d += (r->rop[j] - av->pos[j]) *
702		(av->dir[j] + r->ron[j]);
703	<	if (d*0.5 < -minarad*ambacc)
703	>	if (d*0.5 < -minarad*ambacc-.001)
704		continue;
705		/*
706		*  Jittering final test reduces image artifacts.
707		*/
708	<	wt = sqrt(e1) + sqrt(e2);
709	<	wt *= .9 + .2*frandom();
710	<	if (wt > ambacc)
708	>	e1 = sqrt(e1);
709	>	e2 = sqrt(e2);
710	>	wt = e1 + e2;
711	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
712		continue;
713	+	/*
714	+	*  Recompute directional error using perturbed normal
715	+	*/
716	+	if (rn_dot > 0.0) {
717	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
718	+	wt = e1 + e2;
719	+	}
720		if (wt <= 1e-3)
721		wt = 1e3;
722		else
723		wt = 1.0 / wt;
724		wsum += wt;
725	<	copycolor(ct, av->val);
725	>	extambient(ct, av, r->rop, rn);
726		scalecolor(ct, wt);
727		addcolor(acol, ct);
728		}
#	Line 216 | Line 741 | double  s;
741		break;
742		}
743		if (j == 3)
744	<	wsum += sumambient(acol, r, at->kid+i, ck0, s);
744	>	wsum += sumambient(acol, r, rn, al,
745	>	at->kid+i, ck0, s);
746		}
747		return(wsum);
748		}
749
750
751	<	double
752	<	makeambient(acol, r)            /* make a new ambient value */
753	<	COLOR  acol;
754	<	register RAY  *r;
751	>	static double
752	>	makeambient(            /* make a new ambient value for storage */
753	>	COLOR  acol,
754	>	RAY  *r,
755	>	FVECT  rn,
756	>	int  al
757	>	)
758		{
759	<	AMBVAL  amb;
759	>	AMBVAL  amb;
760		FVECT   gp, gd;
761	+	int     i;
762
763	<	amb.rad = doambient(acol, r, gp, gd);   /* compute ambient */
764	<	if (amb.rad == 0.0)
763	>	amb.weight = 1.0;                       /* compute weight */
764	>	for (i = al; i-- > 0; )
765	>	amb.weight *= AVGREFL;
766	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
767	>	amb.weight = 1.25*r->rweight;
768	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
769	>	/* compute ambient */
770	>	amb.rad = doambient(acol, r, amb.weight, gp, gd);
771	>	if (amb.rad <= FTINY) {
772	>	setcolor(acol, 0.0, 0.0, 0.0);
773		return(0.0);
774	<	/* store it */
774	>	}
775	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
776	>	/* store value */
777		VCOPY(amb.pos, r->rop);
778		VCOPY(amb.dir, r->ron);
779	<	amb.lvl = r->rlvl;
240	<	amb.weight = r->rweight;
779	>	amb.lvl = al;
780		copycolor(amb.val, acol);
781		VCOPY(amb.gpos, gp);
782		VCOPY(amb.gdir, gd);
783		/* insert into tree */
784	<	avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize);
785	<	avsave(&amb);                           /* write to file */
784	>	avsave(&amb);                           /* and save to file */
785	>	if (rn != r->ron)
786	>	extambient(acol, &amb, r->rop, rn);     /* texture */
787		return(amb.rad);
788		}
789
790
791	<	static
792	<	avsave(av)                              /* save an ambient value */
793	<	AMBVAL  *av;
791	>	static void
792	>	extambient(             /* extrapolate value at pv, nv */
793	>	COLOR  cr,
794	>	AMBVAL   *ap,
795	>	FVECT  pv,
796	>	FVECT  nv
797	>	)
798		{
799	<	#ifdef  AMBFLUSH
800	<	static int  nunflshed = 0;
801	<	#endif
802	<	if (ambfp == NULL)
799	>	FVECT  v1;
800	>	int  i;
801	>	double  d;
802	>
803	>	d = 1.0;                        /* zeroeth order */
804	>	/* gradient due to translation */
805	>	for (i = 0; i < 3; i++)
806	>	d += ap->gpos[i]*(pv[i]-ap->pos[i]);
807	>	/* gradient due to rotation */
808	>	VCROSS(v1, ap->dir, nv);
809	>	d += DOT(ap->gdir, v1);
810	>	if (d <= 0.0) {
811	>	setcolor(cr, 0.0, 0.0, 0.0);
812		return;
260	–	if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1)
261	–	goto writerr;
262	–	#ifdef  AMBFLUSH
263	–	if (++nunflshed >= AMBFLUSH) {
264	–	if (fflush(ambfp) == EOF)
265	–	goto writerr;
266	–	nunflshed = 0;
813		}
814	<	#endif
815	<	return;
270	<	writerr:
271	<	error(SYSTEM, "error writing ambient file");
814	>	copycolor(cr, ap->val);
815	>	scalecolor(cr, d);
816		}
817
818
819	<	static
820	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
821	<	AMBVAL  *aval;
822	<	register AMBTREE  *at;
279	<	FVECT  c0;
280	<	double  s;
819	>	static void
820	>	avinsert(                               /* insert ambient value in our tree */
821	>	AMBVAL *av
822	>	)
823		{
824	+	AMBTREE  *at;
825	+	AMBVAL  *ap;
826	+	AMBVAL  avh;
827		FVECT  ck0;
828	+	double  s;
829		int  branch;
830	<	register AMBVAL  *av;
285	<	register int  i;
830	>	int  i;
831
832	<	if ((av = newambval()) == NULL)
833	<	goto memerr;
834	<	copystruct(av, aval);
835	<	VCOPY(ck0, c0);
832	>	if (av->rad <= FTINY)
833	>	error(CONSISTENCY, "zero ambient radius in avinsert");
834	>	at = &atrunk;
835	>	VCOPY(ck0, thescene.cuorg);
836	>	s = thescene.cusize;
837		while (s*(OCTSCALE/2) > av->rad*ambacc) {
838		if (at->kid == NULL)
839		if ((at->kid = newambtree()) == NULL)
840	<	goto memerr;
840	>	error(SYSTEM, "out of memory in avinsert");
841		s *= 0.5;
842		branch = 0;
843		for (i = 0; i < 3; i++)
#	Line 301 | Line 847 | double  s;
847		}
848		at = at->kid + branch;
849		}
850	<	av->next = at->alist;
851	<	at->alist = av;
850	>	avh.next = at->alist;           /* order by increasing level */
851	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
852	>	if (ap->next->lvl >= av->lvl)
853	>	break;
854	>	av->next = ap->next;
855	>	ap->next = (AMBVAL*)av;
856	>	at->alist = avh.next;
857	>	}
858	>
859	>	#endif  /* ! NEWAMB */
860	>
861	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
862	>
863	>	static void
864	>	initambfile(            /* initialize ambient file */
865	>	int  cre8
866	>	)
867	>	{
868	>	extern char  *progname, *octname;
869	>	static char  *mybuf = NULL;
870	>
871	>	#ifdef  F_SETLKW
872	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
873	>	#endif
874	>	SET_FILE_BINARY(ambfp);
875	>	if (mybuf == NULL)
876	>	mybuf = (char *)bmalloc(BUFSIZ+8);
877	>	setbuf(ambfp, mybuf);
878	>	if (cre8) {                     /* new file */
879	>	newheader("RADIANCE", ambfp);
880	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
881	>	progname, colval(ambval,RED),
882	>	colval(ambval,GRN), colval(ambval,BLU),
883	>	ambvwt, ambounce, ambacc);
884	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
885	>	ambdiv, ambssamp, ambres);
886	>	if (octname != NULL)
887	>	fputs(octname, ambfp);
888	>	fputc('\n', ambfp);
889	>	fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
890	>	fputnow(ambfp);
891	>	fputformat(AMBFMT, ambfp);
892	>	fputc('\n', ambfp);
893	>	putambmagic(ambfp);
894	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
895	>	error(USER, "bad ambient file");
896	>	}
897	>
898	>
899	>	static void
900	>	avsave(                         /* insert and save an ambient value */
901	>	AMBVAL  *av
902	>	)
903	>	{
904	>	avinsert(avstore(av));
905	>	if (ambfp == NULL)
906	>	return;
907	>	if (writambval(av, ambfp) < 0)
908	>	goto writerr;
909	>	if (++nunflshed >= AMBFLUSH)
910	>	if (ambsync() == EOF)
911	>	goto writerr;
912		return;
913	<	memerr:
914	<	error(SYSTEM, "out of memory in avinsert");
913	>	writerr:
914	>	error(SYSTEM, "error writing to ambient file");
915		}
916	+
917	+
918	+	static AMBVAL *
919	+	avstore(                                /* allocate memory and store aval */
920	+	AMBVAL  *aval
921	+	)
922	+	{
923	+	AMBVAL  *av;
924	+	double  d;
925	+
926	+	if ((av = newambval()) == NULL)
927	+	error(SYSTEM, "out of memory in avstore");
928	+	*av = *aval;
929	+	av->latick = ambclock;
930	+	av->next = NULL;
931	+	nambvals++;
932	+	d = bright(av->val);
933	+	if (d > FTINY) {                /* add to log sum for averaging */
934	+	avsum += log(d);
935	+	navsum++;
936	+	}
937	+	return(av);
938	+	}
939	+
940	+
941	+	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
942	+
943	+	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
944	+
945	+
946	+	static AMBTREE *
947	+	newambtree(void)                                /* allocate 8 ambient tree structs */
948	+	{
949	+	AMBTREE  *atp, *upperlim;
950	+
951	+	if (atfreelist == NULL) {       /* get more nodes */
952	+	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
953	+	if (atfreelist == NULL)
954	+	return(NULL);
955	+	/* link new free list */
956	+	upperlim = atfreelist + 8*(ATALLOCSZ-1);
957	+	for (atp = atfreelist; atp < upperlim; atp += 8)
958	+	atp->kid = atp + 8;
959	+	atp->kid = NULL;
960	+	}
961	+	atp = atfreelist;
962	+	atfreelist = atp->kid;
963	+	memset((char *)atp, '\0', 8*sizeof(AMBTREE));
964	+	return(atp);
965	+	}
966	+
967	+
968	+	static void
969	+	freeambtree(                    /* free 8 ambient tree structs */
970	+	AMBTREE  *atp
971	+	)
972	+	{
973	+	atp->kid = atfreelist;
974	+	atfreelist = atp;
975	+	}
976	+
977	+
978	+	static void
979	+	unloadatree(                    /* unload an ambient value tree */
980	+	AMBTREE  *at,
981	+	unloadtf_t *f
982	+	)
983	+	{
984	+	AMBVAL  *av;
985	+	int  i;
986	+	/* transfer values at this node */
987	+	for (av = at->alist; av != NULL; av = at->alist) {
988	+	at->alist = av->next;
989	+	(*f)(av);
990	+	}
991	+	if (at->kid == NULL)
992	+	return;
993	+	for (i = 0; i < 8; i++)         /* transfer and free children */
994	+	unloadatree(at->kid+i, f);
995	+	freeambtree(at->kid);
996	+	at->kid = NULL;
997	+	}
998	+
999	+
1000	+	static struct avl {
1001	+	AMBVAL  *p;
1002	+	unsigned long   t;
1003	+	}       *avlist1;                       /* ambient value list with ticks */
1004	+	static AMBVAL   **avlist2;              /* memory positions for sorting */
1005	+	static int      i_avlist;               /* index for lists */
1006	+
1007	+	static int alatcmp(const void *av1, const void *av2);
1008	+
1009	+	static void
1010	+	avfree(AMBVAL *av)
1011	+	{
1012	+	free(av);
1013	+	}
1014	+
1015	+	static void
1016	+	av2list(
1017	+	AMBVAL *av
1018	+	)
1019	+	{
1020	+	#ifdef DEBUG
1021	+	if (i_avlist >= nambvals)
1022	+	error(CONSISTENCY, "too many ambient values in av2list1");
1023	+	#endif
1024	+	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1025	+	avlist1[i_avlist++].t = av->latick;
1026	+	}
1027	+
1028	+
1029	+	static int
1030	+	alatcmp(                        /* compare ambient values for MRA */
1031	+	const void *av1,
1032	+	const void *av2
1033	+	)
1034	+	{
1035	+	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1036	+	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1037	+	}
1038	+
1039	+
1040	+	/* GW NOTE 2002/10/3:
1041	+	* I used to compare AMBVAL pointers, but found that this was the
1042	+	* cause of a serious consistency error with gcc, since the optimizer
1043	+	* uses some dangerous trick in pointer subtraction that
1044	+	* assumes pointers differ by exact struct size increments.
1045	+	*/
1046	+	static int
1047	+	aposcmp(                        /* compare ambient value positions */
1048	+	const void      *avp1,
1049	+	const void      *avp2
1050	+	)
1051	+	{
1052	+	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1053	+	if (diff < 0)
1054	+	return(-1);
1055	+	return(diff > 0);
1056	+	}
1057	+
1058	+
1059	+	static int
1060	+	avlmemi(                                /* find list position from address */
1061	+	AMBVAL  *avaddr
1062	+	)
1063	+	{
1064	+	AMBVAL  **avlpp;
1065	+
1066	+	avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2,
1067	+	nambvals, sizeof(AMBVAL *), &aposcmp);
1068	+	if (avlpp == NULL)
1069	+	error(CONSISTENCY, "address not found in avlmemi");
1070	+	return(avlpp - avlist2);
1071	+	}
1072	+
1073	+
1074	+	static void
1075	+	sortambvals(                    /* resort ambient values */
1076	+	int     always
1077	+	)
1078	+	{
1079	+	AMBTREE  oldatrunk;
1080	+	AMBVAL  tav, *tap, *pnext;
1081	+	int     i, j;
1082	+	/* see if it's time yet */
1083	+	if (!always && (ambclock++ < lastsort+sortintvl ||
1084	+	nambvals < SORT_THRESH))
1085	+	return;
1086	+	/*
1087	+	* The idea here is to minimize memory thrashing
1088	+	* in VM systems by improving reference locality.
1089	+	* We do this by periodically sorting our stored ambient
1090	+	* values in memory in order of most recently to least
1091	+	* recently accessed.  This ordering was chosen so that new
1092	+	* ambient values (which tend to be less important) go into
1093	+	* higher memory with the infrequently accessed values.
1094	+	*      Since we expect our values to need sorting less
1095	+	* frequently as the process continues, we double our
1096	+	* waiting interval after each call.
1097	+	*      This routine is also called by setambacc() with
1098	+	* the "always" parameter set to 1 so that the ambient
1099	+	* tree will be rebuilt with the new accuracy parameter.
1100	+	*/
1101	+	if (tracktime) {                /* allocate pointer arrays to sort */
1102	+	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1103	+	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1104	+	} else {
1105	+	avlist2 = NULL;
1106	+	avlist1 = NULL;
1107	+	}
1108	+	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1109	+	if (avlist2 != NULL)
1110	+	free((void *)avlist2);
1111	+	if (always) {           /* rebuild without sorting */
1112	+	oldatrunk = atrunk;
1113	+	atrunk.alist = NULL;
1114	+	atrunk.kid = NULL;
1115	+	unloadatree(&oldatrunk, &avinsert);
1116	+	}
1117	+	} else {                        /* sort memory by last access time */
1118	+	/*
1119	+	* Sorting memory is tricky because it isn't contiguous.
1120	+	* We have to sort an array of pointers by MRA and also
1121	+	* by memory position.  We then copy values in "loops"
1122	+	* to minimize memory hits.  Nevertheless, we will visit
1123	+	* everyone at least twice, and this is an expensive process
1124	+	* when we're thrashing, which is when we need to do it.
1125	+	*/
1126	+	#ifdef DEBUG
1127	+	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1128	+	nambvals, ambclock);
1129	+	eputs(errmsg);
1130	+	#endif
1131	+	i_avlist = 0;
1132	+	unloadatree(&atrunk, &av2list); /* empty current tree */
1133	+	#ifdef DEBUG
1134	+	if (i_avlist < nambvals)
1135	+	error(CONSISTENCY, "missing ambient values in sortambvals");
1136	+	#endif
1137	+	qsort((char *)avlist1, nambvals, sizeof(struct avl), &alatcmp);
1138	+	qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), &aposcmp);
1139	+	for (i = 0; i < nambvals; i++) {
1140	+	if (avlist1[i].p == NULL)
1141	+	continue;
1142	+	tap = avlist2[i];
1143	+	tav = *tap;
1144	+	for (j = i; (pnext = avlist1[j].p) != tap;
1145	+	j = avlmemi(pnext)) {
1146	+	*(avlist2[j]) = *pnext;
1147	+	avinsert(avlist2[j]);
1148	+	avlist1[j].p = NULL;
1149	+	}
1150	+	*(avlist2[j]) = tav;
1151	+	avinsert(avlist2[j]);
1152	+	avlist1[j].p = NULL;
1153	+	}
1154	+	free((void *)avlist1);
1155	+	free((void *)avlist2);
1156	+	/* compute new sort interval */
1157	+	sortintvl = ambclock - lastsort;
1158	+	if (sortintvl >= MAX_SORT_INTVL/2)
1159	+	sortintvl = MAX_SORT_INTVL;
1160	+	else
1161	+	sortintvl <<= 1;        /* wait twice as long next */
1162	+	#ifdef DEBUG
1163	+	eputs("done\n");
1164	+	#endif
1165	+	}
1166	+	if (ambclock >= MAXACLOCK)
1167	+	ambclock = MAXACLOCK/2;
1168	+	lastsort = ambclock;
1169	+	}
1170	+
1171	+
1172	+	#ifdef  F_SETLKW
1173	+
1174	+	static void
1175	+	aflock(                 /* lock/unlock ambient file */
1176	+	int  typ
1177	+	)
1178	+	{
1179	+	static struct flock  fls;       /* static so initialized to zeroes */
1180	+
1181	+	if (typ == fls.l_type)          /* already called? */
1182	+	return;
1183	+	fls.l_type = typ;
1184	+	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1185	+	error(SYSTEM, "cannot (un)lock ambient file");
1186	+	}
1187	+
1188	+
1189	+	int
1190	+	ambsync(void)                   /* synchronize ambient file */
1191	+	{
1192	+	long  flen;
1193	+	AMBVAL  avs;
1194	+	int  n;
1195	+
1196	+	if (ambfp == NULL)      /* no ambient file? */
1197	+	return(0);
1198	+	/* gain appropriate access */
1199	+	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1200	+	/* see if file has grown */
1201	+	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1202	+	goto seekerr;
1203	+	if ((n = flen - lastpos) > 0) {         /* file has grown */
1204	+	if (ambinp == NULL) {           /* use duplicate filedes */
1205	+	ambinp = fdopen(dup(fileno(ambfp)), "r");
1206	+	if (ambinp == NULL)
1207	+	error(SYSTEM, "fdopen failed in ambsync");
1208	+	}
1209	+	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1210	+	goto seekerr;
1211	+	while (n >= AMBVALSIZ) {        /* load contributed values */
1212	+	if (!readambval(&avs, ambinp)) {
1213	+	sprintf(errmsg,
1214	+	"ambient file \"%s\" corrupted near character %ld",
1215	+	ambfile, flen - n);
1216	+	error(WARNING, errmsg);
1217	+	break;
1218	+	}
1219	+	avinsert(avstore(&avs));
1220	+	n -= AMBVALSIZ;
1221	+	}
1222	+	lastpos = flen - n;
1223	+	/*** seek always as safety measure
1224	+	if (n) ***/                     /* alignment */
1225	+	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1226	+	goto seekerr;
1227	+	}
1228	+	n = fflush(ambfp);                      /* calls write() at last */
1229	+	if (n != EOF)
1230	+	lastpos += (long)nunflshed*AMBVALSIZ;
1231	+	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1232	+	goto seekerr;
1233	+
1234	+	aflock(F_UNLCK);                        /* release file */
1235	+	nunflshed = 0;
1236	+	return(n);
1237	+	seekerr:
1238	+	error(SYSTEM, "seek failed in ambsync");
1239	+	return -1; /* pro forma return */
1240	+	}
1241	+
1242	+	#else   /* ! F_SETLKW */
1243	+
1244	+	int
1245	+	ambsync(void)                   /* flush ambient file */
1246	+	{
1247	+	if (ambfp == NULL)
1248	+	return(0);
1249	+	nunflshed = 0;
1250	+	return(fflush(ambfp));
1251	+	}
1252	+
1253	+	#endif  /* ! F_SETLKW */

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