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

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.14 by greg, Tue Nov 3 21:29:52 1992 UTC vs.
Revision 2.81 by greg, Fri Apr 25 23:04:16 2014 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1992 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	<	*     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"
20	–
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 {
26	<	AMBVAL  *alist;         /* ambient value list */
27	<	struct ambtree  *kid;   /* 8 child nodes */
28	<	}  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 35 | double minarad;                /* minimum ambient radius */
35		static AMBTREE  atrunk;         /* our ambient trunk node */
36
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	+
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	+	#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 *)bmalloc(sizeof(AMBVAL))
80	>	#define  newambval()    (AMBVAL *)malloc(sizeof(AMBVAL))
81	>	#define  freeav(av)     free((void *)av);
82
83	<	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
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	<	extern long  ftell(), lseek();
90	<	static int  initambfile(), avsave(), avinsert(), ambsync();
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	<	setambres(ar)                           /* set ambient resolution */
100	<	int  ar;
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	+	ambres = ar < 0 ? 0 : ar;               /* may be done already */
110		/* set min & max radii */
111		if (ar <= 0) {
112	<	minarad = 0.0;
112	>	minarad = 0;
113		maxarad = thescene.cusize / 2.0;
114		} else {
115		minarad = thescene.cusize / ar;
116	<	maxarad = 16.0 * minarad;               /* heuristic */
116	>	maxarad = 64 * minarad;                 /* heuristic */
117		if (maxarad > thescene.cusize / 2.0)
118		maxarad = thescene.cusize / 2.0;
119		}
120	<	if (maxarad <= FTINY)
121	<	maxarad = .001;
120	>	if (minarad <= FTINY)
121	>	minarad = 10*FTINY;
122	>	if (maxarad <= minarad)
123	>	maxarad = 64 * minarad;
124		}
125
126
127	<	setambient(afile)                       /* initialize calculation */
128	<	char  *afile;
127	>	void
128	>	setambacc(                              /* set ambient accuracy */
129	>	double  newa
130	>	)
131		{
132	<	long  headlen;
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 (afile != NULL)
166	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
167	<	initambfile(0);
168	<	headlen = ftell(ambfp);
169	<	while (readambval(&amb, ambfp))
170	<	avinsert(&amb, &atrunk, thescene.cuorg,
171	<	thescene.cusize);
172	<	/* align */
173	<	fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1);
174	<	} else if ((ambfp = fopen(afile, "w+")) != NULL)
175	<	initambfile(1);
176	<	else {
177	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
178	<	afile);
179	<	error(SYSTEM, errmsg);
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 115 | 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  d;
287	>	COLOR   acol;
288	>	int     ok;
289	>	double  d, l;
290
291		if (ambdiv <= 0)                        /* no ambient calculation */
292		goto dumbamb;
#	Line 134 | Line 299 | register RAY  *r;
299		goto dumbamb;
300
301		if (ambacc <= FTINY) {                  /* no ambient storage */
302	+	copycolor(acol, aval);
303		rdepth++;
304	<	d = doambient(acol, r, r->rweight, NULL, NULL);
304	>	ok = doambient(acol, r, r->rweight, NULL, NULL, NULL, NULL);
305		rdepth--;
306	<	if (d == 0.0)
306	>	if (!ok)
307		goto dumbamb;
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	<	d = sumambient(acol, r, rdepth,
316	>	d = sumambient(acol, r, nrm, rdepth,
317		&atrunk, thescene.cuorg, thescene.cusize);
318	<	if (d > FTINY)
319	<	scalecolor(acol, 1.0/d);
320	<	else {
321	<	d = makeambient(acol, r, rdepth++);
322	<	rdepth--;
318	>	if (d > FTINY) {
319	>	d = 1.0/d;
320	>	scalecolor(acol, d);
321	>	multcolor(aval, acol);
322	>	return;
323		}
324	<	if (d > FTINY)
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	<	copycolor(acol, ambval);
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(acol, r, al, at, c0, s)      /* get interpolated ambient value */
352	<	COLOR  acol;
353	<	register RAY  *r;
354	<	int  al;
355	<	AMBTREE  *at;
356	<	FVECT  c0;
357	<	double  s;
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 10 degrees plus ambacc radians */
361	>	const double    minangle = 10.0 * 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	>	*  Modified ray behind test
395	>	*/
396	>	VSUB(ck0, av->pos, r->rop);
397	>	d = DOT(ck0, uvw[2]);
398	>	if (d < -minarad*qambacc-.001)
399	>	continue;
400	>	d /= av->rad[0];
401	>	delta_t2 = d*d;
402	>	if (delta_t2 >= qambacc*qambacc)
403	>	continue;
404	>	/*
405	>	*  Elliptical radii test based on Hessian
406	>	*/
407	>	decodedir(uvw[0], av->udir);
408	>	VCROSS(uvw[1], uvw[2], uvw[0]);
409	>	d = DOT(ck0, uvw[0]) / av->rad[0];
410	>	delta_t2 += d*d;
411	>	d = DOT(ck0, uvw[1]) / av->rad[1];
412	>	delta_t2 += d*d;
413	>	if (delta_t2 >= qambacc*qambacc)
414	>	continue;
415	>	/*
416	>	*  Extrapolate value and compute final weight (hat function)
417	>	*/
418	>	extambient(ct, av, r->rop, rn, uvw);
419	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
420	>	tfunc(qambacc, sqrt(delta_t2), 0.0);
421	>	scalecolor(ct, d);
422	>	addcolor(acol, ct);
423	>	wsum += d;
424	>	}
425	>	if (at->kid == NULL)
426	>	return(wsum);
427	>	/* sum children */
428	>	s *= 0.5;
429	>	for (i = 0; i < 8; i++) {
430	>	for (j = 0; j < 3; j++) {
431	>	ck0[j] = c0[j];
432	>	if (1<<j & i)
433	>	ck0[j] += s;
434	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
435	>	break;
436	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
437	>	break;
438	>	}
439	>	if (j == 3)
440	>	wsum += sumambient(acol, r, rn, al,
441	>	at->kid+i, ck0, s);
442	>	}
443	>	return(wsum);
444	>	}
445	>
446	>
447	>	int
448	>	makeambient(            /* make a new ambient value for storage */
449	>	COLOR  acol,
450	>	RAY  *r,
451	>	FVECT  rn,
452	>	int  al
453	>	)
454		{
455	+	AMBVAL  amb;
456	+	FVECT   uvw[3];
457	+	int     i;
458	+
459	+	amb.weight = 1.0;                       /* compute weight */
460	+	for (i = al; i-- > 0; )
461	+	amb.weight *= AVGREFL;
462	+	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
463	+	amb.weight = 1.25*r->rweight;
464	+	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
465	+	/* compute ambient */
466	+	i = doambient(acol, r, amb.weight, uvw, amb.rad, amb.gpos, amb.gdir);
467	+	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
468	+	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
469	+	return(i);
470	+	/* store value */
471	+	VCOPY(amb.pos, r->rop);
472	+	amb.ndir = encodedir(r->ron);
473	+	amb.udir = encodedir(uvw[0]);
474	+	amb.lvl = al;
475	+	copycolor(amb.val, acol);
476	+	/* insert into tree */
477	+	avsave(&amb);                           /* and save to file */
478	+	if (rn != r->ron) {                     /* texture */
479	+	VCOPY(uvw[2], r->ron);
480	+	extambient(acol, &amb, r->rop, rn, uvw);
481	+	}
482	+	return(1);
483	+	}
484	+
485	+
486	+	void
487	+	extambient(             /* extrapolate value at pv, nv */
488	+	COLOR  cr,
489	+	AMBVAL   *ap,
490	+	FVECT  pv,
491	+	FVECT  nv,
492	+	FVECT  uvw[3]
493	+	)
494	+	{
495	+	static FVECT    my_uvw[3];
496	+	FVECT           v1;
497	+	int             i;
498	+	double          d = 1.0;        /* zeroeth order */
499	+
500	+	if (uvw == NULL) {              /* need local coordinates? */
501	+	decodedir(my_uvw[2], ap->ndir);
502	+	decodedir(my_uvw[0], ap->udir);
503	+	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
504	+	uvw = my_uvw;
505	+	}
506	+	for (i = 3; i--; )              /* gradient due to translation */
507	+	d += (pv[i] - ap->pos[i]) *
508	+	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
509	+
510	+	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
511	+	for (i = 3; i--; )
512	+	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
513	+
514	+	if (d <= 0.0) {
515	+	setcolor(cr, 0.0, 0.0, 0.0);
516	+	return;
517	+	}
518	+	copycolor(cr, ap->val);
519	+	scalecolor(cr, d);
520	+	}
521	+
522	+
523	+	static void
524	+	avinsert(                               /* insert ambient value in our tree */
525	+	AMBVAL *av
526	+	)
527	+	{
528	+	AMBTREE  *at;
529	+	AMBVAL  *ap;
530	+	AMBVAL  avh;
531	+	FVECT  ck0;
532	+	double  s;
533	+	int  branch;
534	+	int  i;
535	+
536	+	if (av->rad[0] <= FTINY)
537	+	error(CONSISTENCY, "zero ambient radius in avinsert");
538	+	at = &atrunk;
539	+	VCOPY(ck0, thescene.cuorg);
540	+	s = thescene.cusize;
541	+	while (s*(OCTSCALE/2) > av->rad[1]*qambacc) {
542	+	if (at->kid == NULL)
543	+	if ((at->kid = newambtree()) == NULL)
544	+	error(SYSTEM, "out of memory in avinsert");
545	+	s *= 0.5;
546	+	branch = 0;
547	+	for (i = 0; i < 3; i++)
548	+	if (av->pos[i] > ck0[i] + s) {
549	+	ck0[i] += s;
550	+	branch |= 1 << i;
551	+	}
552	+	at = at->kid + branch;
553	+	}
554	+	avh.next = at->alist;           /* order by increasing level */
555	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
556	+	if (ap->next->lvl >= av->lvl)
557	+	break;
558	+	av->next = ap->next;
559	+	ap->next = (AMBVAL*)av;
560	+	at->alist = avh.next;
561	+	}
562	+
563	+
564	+	#else /* ! NEWAMB */
565	+
566	+	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
567	+	AMBTREE *at, FVECT c0, double s);
568	+	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
569	+	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
570	+
571	+
572	+	void
573	+	multambient(            /* compute ambient component & multiply by coef. */
574	+	COLOR  aval,
575	+	RAY  *r,
576	+	FVECT  nrm
577	+	)
578	+	{
579	+	static int  rdepth = 0;                 /* ambient recursion */
580	+	COLOR   acol;
581	+	double  d, l;
582	+
583	+	if (ambdiv <= 0)                        /* no ambient calculation */
584	+	goto dumbamb;
585	+	/* check number of bounces */
586	+	if (rdepth >= ambounce)
587	+	goto dumbamb;
588	+	/* check ambient list */
589	+	if (ambincl != -1 && r->ro != NULL &&
590	+	ambincl != inset(ambset, r->ro->omod))
591	+	goto dumbamb;
592	+
593	+	if (ambacc <= FTINY) {                  /* no ambient storage */
594	+	copycolor(acol, aval);
595	+	rdepth++;
596	+	d = doambient(acol, r, r->rweight, NULL, NULL);
597	+	rdepth--;
598	+	if (d <= FTINY)
599	+	goto dumbamb;
600	+	copycolor(aval, acol);
601	+	return;
602	+	}
603	+
604	+	if (tracktime)                          /* sort to minimize thrashing */
605	+	sortambvals(0);
606	+	/* interpolate ambient value */
607	+	setcolor(acol, 0.0, 0.0, 0.0);
608	+	d = sumambient(acol, r, nrm, rdepth,
609	+	&atrunk, thescene.cuorg, thescene.cusize);
610	+	if (d > FTINY) {
611	+	d = 1.0/d;
612	+	scalecolor(acol, d);
613	+	multcolor(aval, acol);
614	+	return;
615	+	}
616	+	rdepth++;                               /* need to cache new value */
617	+	d = makeambient(acol, r, nrm, rdepth-1);
618	+	rdepth--;
619	+	if (d > FTINY) {
620	+	multcolor(aval, acol);          /* got new value */
621	+	return;
622	+	}
623	+	dumbamb:                                        /* return global value */
624	+	if ((ambvwt <= 0) | (navsum == 0)) {
625	+	multcolor(aval, ambval);
626	+	return;
627	+	}
628	+	l = bright(ambval);                     /* average in computations */
629	+	if (l > FTINY) {
630	+	d = (log(l)*(double)ambvwt + avsum) /
631	+	(double)(ambvwt + navsum);
632	+	d = exp(d) / l;
633	+	scalecolor(aval, d);
634	+	multcolor(aval, ambval);        /* apply color of ambval */
635	+	} else {
636	+	d = exp( avsum / (double)navsum );
637	+	scalecolor(aval, d);            /* neutral color */
638	+	}
639	+	}
640	+
641	+
642	+	static double
643	+	sumambient(     /* get interpolated ambient value */
644	+	COLOR  acol,
645	+	RAY  *r,
646	+	FVECT  rn,
647	+	int  al,
648	+	AMBTREE  *at,
649	+	FVECT  c0,
650	+	double  s
651	+	)
652	+	{
653		double  d, e1, e2, wt, wsum;
654		COLOR  ct;
655		FVECT  ck0;
656		int  i;
657	<	register int  j;
658	<	register AMBVAL  *av;
659	<	/* do this node */
657	>	int  j;
658	>	AMBVAL   *av;
659	>
660		wsum = 0.0;
661	+	/* do this node */
662		for (av = at->alist; av != NULL; av = av->next) {
663	+	double  rn_dot = -2.0;
664	+	if (tracktime)
665	+	av->latick = ambclock;
666		/*
667		*  Ambient level test.
668		*/
669	<	if (av->lvl > al || av->weight < r->rweight-FTINY)
669	>	if (av->lvl > al)       /* list sorted, so this works */
670	>	break;
671	>	if (av->weight < 0.9*r->rweight)
672		continue;
673		/*
674		*  Ambient radius test.
675		*/
676	<	e1 = 0.0;
677	<	for (j = 0; j < 3; j++) {
189	<	d = av->pos[j] - r->rop[j];
190	<	e1 += d * d;
191	<	}
192	<	e1 /= av->rad * av->rad;
676	>	VSUB(ck0, av->pos, r->rop);
677	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
678		if (e1 > ambacc*ambacc*1.21)
679		continue;
680		/*
681	<	*  Normal direction test.
681	>	*  Direction test using closest normal.
682		*/
683	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
684	<	if (e2 < 0.0) e2 = 0.0;
685	<	if (e1 + e2 > ambacc*ambacc*1.21)
683	>	d = DOT(av->dir, r->ron);
684	>	if (rn != r->ron) {
685	>	rn_dot = DOT(av->dir, rn);
686	>	if (rn_dot > 1.0-FTINY)
687	>	rn_dot = 1.0-FTINY;
688	>	if (rn_dot >= d-FTINY) {
689	>	d = rn_dot;
690	>	rn_dot = -2.0;
691	>	}
692	>	}
693	>	e2 = (1.0 - d) * r->rweight;
694	>	if (e2 < 0.0)
695	>	e2 = 0.0;
696	>	else if (e1 + e2 > ambacc*ambacc*1.21)
697		continue;
698		/*
699		*  Ray behind test.
#	Line 211 | Line 707 | double s;
707		/*
708		*  Jittering final test reduces image artifacts.
709		*/
710	<	wt = sqrt(e1) + sqrt(e2);
711	<	wt *= .9 + .2*urand(9015+samplendx);
712	<	if (wt > ambacc)
710	>	e1 = sqrt(e1);
711	>	e2 = sqrt(e2);
712	>	wt = e1 + e2;
713	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
714		continue;
715	+	/*
716	+	*  Recompute directional error using perturbed normal
717	+	*/
718	+	if (rn_dot > 0.0) {
719	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
720	+	wt = e1 + e2;
721	+	}
722		if (wt <= 1e-3)
723		wt = 1e3;
724		else
725		wt = 1.0 / wt;
726		wsum += wt;
727	<	extambient(ct, av, r->rop, r->ron);
727	>	extambient(ct, av, r->rop, rn);
728		scalecolor(ct, wt);
729		addcolor(acol, ct);
730		}
#	Line 239 | Line 743 | double s;
743		break;
744		}
745		if (j == 3)
746	<	wsum += sumambient(acol, r, al, at->kid+i, ck0, s);
746	>	wsum += sumambient(acol, r, rn, al,
747	>	at->kid+i, ck0, s);
748		}
749		return(wsum);
750		}
751
752
753	<	double
754	<	makeambient(acol, r, al)        /* make a new ambient value */
755	<	COLOR  acol;
756	<	register RAY  *r;
757	<	int  al;
753	>	static double
754	>	makeambient(            /* make a new ambient value for storage */
755	>	COLOR  acol,
756	>	RAY  *r,
757	>	FVECT  rn,
758	>	int  al
759	>	)
760		{
761		AMBVAL  amb;
762		FVECT   gp, gd;
763	<	/* compute weight */
764	<	amb.weight = pow(AVGREFL, (double)al);
765	<	if (r->rweight < 0.2*amb.weight)        /* heuristic */
766	<	amb.weight = r->rweight;
763	>	int     i;
764	>
765	>	amb.weight = 1.0;                       /* compute weight */
766	>	for (i = al; i-- > 0; )
767	>	amb.weight *= AVGREFL;
768	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
769	>	amb.weight = 1.25*r->rweight;
770	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
771		/* compute ambient */
772		amb.rad = doambient(acol, r, amb.weight, gp, gd);
773	<	if (amb.rad == 0.0)
773	>	if (amb.rad <= FTINY) {
774	>	setcolor(acol, 0.0, 0.0, 0.0);
775		return(0.0);
776	<	/* store it */
776	>	}
777	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
778	>	/* store value */
779		VCOPY(amb.pos, r->rop);
780		VCOPY(amb.dir, r->ron);
781		amb.lvl = al;
#	Line 270 | Line 784 | int  al;
784		VCOPY(amb.gdir, gd);
785		/* insert into tree */
786		avsave(&amb);                           /* and save to file */
787	+	if (rn != r->ron)
788	+	extambient(acol, &amb, r->rop, rn);     /* texture */
789		return(amb.rad);
790		}
791
792
793	<	extambient(cr, ap, pv, nv)              /* extrapolate value at pv, nv */
794	<	COLOR  cr;
795	<	register AMBVAL  *ap;
796	<	FVECT  pv, nv;
793	>	static void
794	>	extambient(             /* extrapolate value at pv, nv */
795	>	COLOR  cr,
796	>	AMBVAL   *ap,
797	>	FVECT  pv,
798	>	FVECT  nv
799	>	)
800		{
801	<	FVECT  v1, v2;
802	<	register int  i;
801	>	FVECT  v1;
802	>	int  i;
803		double  d;
804
805		d = 1.0;                        /* zeroeth order */
#	Line 288 | Line 807 | FVECT  pv, nv;
807		for (i = 0; i < 3; i++)
808		d += ap->gpos[i]*(pv[i]-ap->pos[i]);
809		/* gradient due to rotation */
810	<	VCOPY(v1, ap->dir);
811	<	fcross(v2, v1, nv);
293	<	d += DOT(ap->gdir, v2);
810	>	VCROSS(v1, ap->dir, nv);
811	>	d += DOT(ap->gdir, v1);
812		if (d <= 0.0) {
813		setcolor(cr, 0.0, 0.0, 0.0);
814		return;
#	Line 300 | Line 818 | FVECT  pv, nv;
818		}
819
820
821	<	static
822	<	initambfile(creat)              /* initialize ambient file */
823	<	int  creat;
821	>	static void
822	>	avinsert(                               /* insert ambient value in our tree */
823	>	AMBVAL *av
824	>	)
825		{
826	<	extern char  *progname, *octname, VersionID[];
826	>	AMBTREE  *at;
827	>	AMBVAL  *ap;
828	>	AMBVAL  avh;
829	>	FVECT  ck0;
830	>	double  s;
831	>	int  branch;
832	>	int  i;
833
834	<	#ifdef MSDOS
835	<	setmode(fileno(ambfp), O_BINARY);
834	>	if (av->rad <= FTINY)
835	>	error(CONSISTENCY, "zero ambient radius in avinsert");
836	>	at = &atrunk;
837	>	VCOPY(ck0, thescene.cuorg);
838	>	s = thescene.cusize;
839	>	while (s*(OCTSCALE/2) > av->rad*ambacc) {
840	>	if (at->kid == NULL)
841	>	if ((at->kid = newambtree()) == NULL)
842	>	error(SYSTEM, "out of memory in avinsert");
843	>	s *= 0.5;
844	>	branch = 0;
845	>	for (i = 0; i < 3; i++)
846	>	if (av->pos[i] > ck0[i] + s) {
847	>	ck0[i] += s;
848	>	branch |= 1 << i;
849	>	}
850	>	at = at->kid + branch;
851	>	}
852	>	avh.next = at->alist;           /* order by increasing level */
853	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
854	>	if (ap->next->lvl >= av->lvl)
855	>	break;
856	>	av->next = ap->next;
857	>	ap->next = (AMBVAL*)av;
858	>	at->alist = avh.next;
859	>	}
860	>
861	>	#endif  /* ! NEWAMB */
862	>
863	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
864	>
865	>	static void
866	>	initambfile(            /* initialize ambient file */
867	>	int  cre8
868	>	)
869	>	{
870	>	extern char  *progname, *octname;
871	>	static char  *mybuf = NULL;
872	>
873	>	#ifdef  F_SETLKW
874	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
875		#endif
876	<	setbuf(ambfp, bmalloc(BUFSIZ));
877	<	if (creat) {                    /* new file */
878	<	fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ",
876	>	SET_FILE_BINARY(ambfp);
877	>	if (mybuf == NULL)
878	>	mybuf = (char *)bmalloc(BUFSIZ+8);
879	>	setbuf(ambfp, mybuf);
880	>	if (cre8) {                     /* new file */
881	>	newheader("RADIANCE", ambfp);
882	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
883		progname, colval(ambval,RED),
884		colval(ambval,GRN), colval(ambval,BLU),
885	<	ambounce, ambacc);
886	<	fprintf(ambfp, "-ad %d -as %d -ar %d %s\n",
887	<	ambdiv, ambssamp, ambres,
888	<	octname==NULL ? "" : octname);
885	>	ambvwt, ambounce, ambacc);
886	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
887	>	ambdiv, ambssamp, ambres);
888	>	if (octname != NULL)
889	>	fputs(octname, ambfp);
890	>	fputc('\n', ambfp);
891		fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
892	+	fputnow(ambfp);
893		fputformat(AMBFMT, ambfp);
894	<	putc('\n', ambfp);
894	>	fputc('\n', ambfp);
895		putambmagic(ambfp);
325	–	fflush(ambfp);
326	–	#ifndef  NIX
327	–	sync();                 /* protect against NFS buffering */
328	–	#endif
896		} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
897		error(USER, "bad ambient file");
898		}
899
900
901	<	static
902	<	avsave(av)                              /* insert and save an ambient value */
903	<	AMBVAL  *av;
901	>	static void
902	>	avsave(                         /* insert and save an ambient value */
903	>	AMBVAL  *av
904	>	)
905		{
906	<	static int  nunflshed = 0;
339	<
340	<	avinsert(av, &atrunk, thescene.cuorg, thescene.cusize);
906	>	avinsert(avstore(av));
907		if (ambfp == NULL)
908		return;
909		if (writambval(av, ambfp) < 0)
910		goto writerr;
911	<	if (++nunflshed >= AMBFLUSH) {
911	>	if (++nunflshed >= AMBFLUSH)
912		if (ambsync() == EOF)
913		goto writerr;
348	–	nunflshed = 0;
349	–	}
914		return;
915		writerr:
916	<	error(SYSTEM, "error writing ambient file");
916	>	error(SYSTEM, "error writing to ambient file");
917		}
918
919
920	<	static
921	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
922	<	AMBVAL  *aval;
923	<	register AMBTREE  *at;
360	<	FVECT  c0;
361	<	double  s;
920	>	static AMBVAL *
921	>	avstore(                                /* allocate memory and store aval */
922	>	AMBVAL  *aval
923	>	)
924		{
925	<	FVECT  ck0;
926	<	int  branch;
365	<	register AMBVAL  *av;
366	<	register int  i;
925	>	AMBVAL  *av;
926	>	double  d;
927
928		if ((av = newambval()) == NULL)
929	<	goto memerr;
930	<	copystruct(av, aval);
931	<	VCOPY(ck0, c0);
932	<	while (s*(OCTSCALE/2) > av->rad*ambacc) {
933	<	if (at->kid == NULL)
934	<	if ((at->kid = newambtree()) == NULL)
935	<	goto memerr;
936	<	s *= 0.5;
937	<	branch = 0;
378	<	for (i = 0; i < 3; i++)
379	<	if (av->pos[i] > ck0[i] + s) {
380	<	ck0[i] += s;
381	<	branch |= 1 << i;
382	<	}
383	<	at = at->kid + branch;
929	>	error(SYSTEM, "out of memory in avstore");
930	>	*av = *aval;
931	>	av->latick = ambclock;
932	>	av->next = NULL;
933	>	nambvals++;
934	>	d = bright(av->val);
935	>	if (d > FTINY) {                /* add to log sum for averaging */
936	>	avsum += log(d);
937	>	navsum++;
938		}
939	<	av->next = at->alist;
386	<	at->alist = av;
387	<	return;
388	<	memerr:
389	<	error(SYSTEM, "out of memory in avinsert");
939	>	return(av);
940		}
941
942
943	<	#ifdef  NIX
943	>	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
944
945	<	static
946	<	ambsync()                       /* flush ambient file */
945	>	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
946	>
947	>
948	>	static AMBTREE *
949	>	newambtree(void)                                /* allocate 8 ambient tree structs */
950		{
951	<	return(fflush(ambfp));
951	>	AMBTREE  *atp, *upperlim;
952	>
953	>	if (atfreelist == NULL) {       /* get more nodes */
954	>	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
955	>	if (atfreelist == NULL)
956	>	return(NULL);
957	>	/* link new free list */
958	>	upperlim = atfreelist + 8*(ATALLOCSZ-1);
959	>	for (atp = atfreelist; atp < upperlim; atp += 8)
960	>	atp->kid = atp + 8;
961	>	atp->kid = NULL;
962	>	}
963	>	atp = atfreelist;
964	>	atfreelist = atp->kid;
965	>	memset((char *)atp, '\0', 8*sizeof(AMBTREE));
966	>	return(atp);
967		}
968
401	–	#else
969
970	<	#include  <sys/types.h>
971	<	#include  <sys/stat.h>
970	>	static void
971	>	freeambtree(                    /* free 8 ambient tree structs */
972	>	AMBTREE  *atp
973	>	)
974	>	{
975	>	atp->kid = atfreelist;
976	>	atfreelist = atp;
977	>	}
978
979	<	static
980	<	ambsync()                       /* synchronize ambient file */
979	>
980	>	static void
981	>	unloadatree(                    /* unload an ambient value tree */
982	>	AMBTREE  *at,
983	>	unloadtf_t *f
984	>	)
985		{
986	<	static FILE  *ambinp = NULL;
987	<	struct flock  fls;
988	<	struct stat  sts;
989	<	#define flen    sts.st_size
990	<	AMBVAL  avs;
991	<	long  lastpos;
992	<	register int  n;
993	<	/* gain exclusive access */
994	<	fls.l_type = F_WRLCK;
995	<	fls.l_whence = 0;
996	<	fls.l_start = 0L;
997	<	fls.l_len = 0L;
986	>	AMBVAL  *av;
987	>	int  i;
988	>	/* transfer values at this node */
989	>	for (av = at->alist; av != NULL; av = at->alist) {
990	>	at->alist = av->next;
991	>	(*f)(av);
992	>	}
993	>	if (at->kid == NULL)
994	>	return;
995	>	for (i = 0; i < 8; i++)         /* transfer and free children */
996	>	unloadatree(at->kid+i, f);
997	>	freeambtree(at->kid);
998	>	at->kid = NULL;
999	>	}
1000	>
1001	>
1002	>	static struct avl {
1003	>	AMBVAL  *p;
1004	>	unsigned long   t;
1005	>	}       *avlist1;                       /* ambient value list with ticks */
1006	>	static AMBVAL   **avlist2;              /* memory positions for sorting */
1007	>	static int      i_avlist;               /* index for lists */
1008	>
1009	>	static int alatcmp(const void *av1, const void *av2);
1010	>
1011	>	static void
1012	>	avfree(AMBVAL *av)
1013	>	{
1014	>	free(av);
1015	>	}
1016	>
1017	>	static void
1018	>	av2list(
1019	>	AMBVAL *av
1020	>	)
1021	>	{
1022	>	#ifdef DEBUG
1023	>	if (i_avlist >= nambvals)
1024	>	error(CONSISTENCY, "too many ambient values in av2list1");
1025	>	#endif
1026	>	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1027	>	avlist1[i_avlist++].t = av->latick;
1028	>	}
1029	>
1030	>
1031	>	static int
1032	>	alatcmp(                        /* compare ambient values for MRA */
1033	>	const void *av1,
1034	>	const void *av2
1035	>	)
1036	>	{
1037	>	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1038	>	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1039	>	}
1040	>
1041	>
1042	>	/* GW NOTE 2002/10/3:
1043	>	* I used to compare AMBVAL pointers, but found that this was the
1044	>	* cause of a serious consistency error with gcc, since the optimizer
1045	>	* uses some dangerous trick in pointer subtraction that
1046	>	* assumes pointers differ by exact struct size increments.
1047	>	*/
1048	>	static int
1049	>	aposcmp(                        /* compare ambient value positions */
1050	>	const void      *avp1,
1051	>	const void      *avp2
1052	>	)
1053	>	{
1054	>	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1055	>	if (diff < 0)
1056	>	return(-1);
1057	>	return(diff > 0);
1058	>	}
1059	>
1060	>
1061	>	static int
1062	>	avlmemi(                                /* find list position from address */
1063	>	AMBVAL  *avaddr
1064	>	)
1065	>	{
1066	>	AMBVAL  **avlpp;
1067	>
1068	>	avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2,
1069	>	nambvals, sizeof(AMBVAL *), &aposcmp);
1070	>	if (avlpp == NULL)
1071	>	error(CONSISTENCY, "address not found in avlmemi");
1072	>	return(avlpp - avlist2);
1073	>	}
1074	>
1075	>
1076	>	static void
1077	>	sortambvals(                    /* resort ambient values */
1078	>	int     always
1079	>	)
1080	>	{
1081	>	AMBTREE  oldatrunk;
1082	>	AMBVAL  tav, *tap, *pnext;
1083	>	int     i, j;
1084	>	/* see if it's time yet */
1085	>	if (!always && (ambclock++ < lastsort+sortintvl ||
1086	>	nambvals < SORT_THRESH))
1087	>	return;
1088	>	/*
1089	>	* The idea here is to minimize memory thrashing
1090	>	* in VM systems by improving reference locality.
1091	>	* We do this by periodically sorting our stored ambient
1092	>	* values in memory in order of most recently to least
1093	>	* recently accessed.  This ordering was chosen so that new
1094	>	* ambient values (which tend to be less important) go into
1095	>	* higher memory with the infrequently accessed values.
1096	>	*      Since we expect our values to need sorting less
1097	>	* frequently as the process continues, we double our
1098	>	* waiting interval after each call.
1099	>	*      This routine is also called by setambacc() with
1100	>	* the "always" parameter set to 1 so that the ambient
1101	>	* tree will be rebuilt with the new accuracy parameter.
1102	>	*/
1103	>	if (tracktime) {                /* allocate pointer arrays to sort */
1104	>	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1105	>	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1106	>	} else {
1107	>	avlist2 = NULL;
1108	>	avlist1 = NULL;
1109	>	}
1110	>	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1111	>	if (avlist2 != NULL)
1112	>	free((void *)avlist2);
1113	>	if (always) {           /* rebuild without sorting */
1114	>	oldatrunk = atrunk;
1115	>	atrunk.alist = NULL;
1116	>	atrunk.kid = NULL;
1117	>	unloadatree(&oldatrunk, &avinsert);
1118	>	}
1119	>	} else {                        /* sort memory by last access time */
1120	>	/*
1121	>	* Sorting memory is tricky because it isn't contiguous.
1122	>	* We have to sort an array of pointers by MRA and also
1123	>	* by memory position.  We then copy values in "loops"
1124	>	* to minimize memory hits.  Nevertheless, we will visit
1125	>	* everyone at least twice, and this is an expensive process
1126	>	* when we're thrashing, which is when we need to do it.
1127	>	*/
1128	>	#ifdef DEBUG
1129	>	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1130	>	nambvals, ambclock);
1131	>	eputs(errmsg);
1132	>	#endif
1133	>	i_avlist = 0;
1134	>	unloadatree(&atrunk, &av2list); /* empty current tree */
1135	>	#ifdef DEBUG
1136	>	if (i_avlist < nambvals)
1137	>	error(CONSISTENCY, "missing ambient values in sortambvals");
1138	>	#endif
1139	>	qsort((char *)avlist1, nambvals, sizeof(struct avl), &alatcmp);
1140	>	qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), &aposcmp);
1141	>	for (i = 0; i < nambvals; i++) {
1142	>	if (avlist1[i].p == NULL)
1143	>	continue;
1144	>	tap = avlist2[i];
1145	>	tav = *tap;
1146	>	for (j = i; (pnext = avlist1[j].p) != tap;
1147	>	j = avlmemi(pnext)) {
1148	>	*(avlist2[j]) = *pnext;
1149	>	avinsert(avlist2[j]);
1150	>	avlist1[j].p = NULL;
1151	>	}
1152	>	*(avlist2[j]) = tav;
1153	>	avinsert(avlist2[j]);
1154	>	avlist1[j].p = NULL;
1155	>	}
1156	>	free((void *)avlist1);
1157	>	free((void *)avlist2);
1158	>	/* compute new sort interval */
1159	>	sortintvl = ambclock - lastsort;
1160	>	if (sortintvl >= MAX_SORT_INTVL/2)
1161	>	sortintvl = MAX_SORT_INTVL;
1162	>	else
1163	>	sortintvl <<= 1;        /* wait twice as long next */
1164	>	#ifdef DEBUG
1165	>	eputs("done\n");
1166	>	#endif
1167	>	}
1168	>	if (ambclock >= MAXACLOCK)
1169	>	ambclock = MAXACLOCK/2;
1170	>	lastsort = ambclock;
1171	>	}
1172	>
1173	>
1174	>	#ifdef  F_SETLKW
1175	>
1176	>	static void
1177	>	aflock(                 /* lock/unlock ambient file */
1178	>	int  typ
1179	>	)
1180	>	{
1181	>	static struct flock  fls;       /* static so initialized to zeroes */
1182	>
1183	>	if (typ == fls.l_type)          /* already called? */
1184	>	return;
1185	>	fls.l_type = typ;
1186		if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1187	<	error(SYSTEM, "cannot lock ambient file");
1187	>	error(SYSTEM, "cannot (un)lock ambient file");
1188	>	}
1189	>
1190	>
1191	>	int
1192	>	ambsync(void)                   /* synchronize ambient file */
1193	>	{
1194	>	long  flen;
1195	>	AMBVAL  avs;
1196	>	int  n;
1197	>
1198	>	if (ambfp == NULL)      /* no ambient file? */
1199	>	return(0);
1200	>	/* gain appropriate access */
1201	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1202		/* see if file has grown */
1203	<	lastpos = lseek(fileno(ambfp), 0L, 1);  /* get previous position */
1204	<	if (fstat(fileno(ambfp), &sts) < 0)     /* get current length */
1205	<	error(SYSTEM, "cannot stat ambient file");
1206	<	if (n = (flen - lastpos)/AMBVALSIZ) {   /* file has grown */
428	<	if (ambinp == NULL) {           /* use duplicate file */
1203	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1204	>	goto seekerr;
1205	>	if ((n = flen - lastpos) > 0) {         /* file has grown */
1206	>	if (ambinp == NULL) {           /* use duplicate filedes */
1207		ambinp = fdopen(dup(fileno(ambfp)), "r");
1208		if (ambinp == NULL)
1209		error(SYSTEM, "fdopen failed in ambsync");
1210		}
1211	<	while (n--) {                   /* load contributed values */
1212	<	readambval(&avs, ambinp);
1213	<	avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize);
1214	<	}                               /* moves shared file pointer */
1215	<	if (n = (flen - lastpos)%AMBVALSIZ)     /* alignment */
1216	<	lseek(fileno(ambfp), flen-n, 0);
1211	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1212	>	goto seekerr;
1213	>	while (n >= AMBVALSIZ) {        /* load contributed values */
1214	>	if (!readambval(&avs, ambinp)) {
1215	>	sprintf(errmsg,
1216	>	"ambient file \"%s\" corrupted near character %ld",
1217	>	ambfile, flen - n);
1218	>	error(WARNING, errmsg);
1219	>	break;
1220	>	}
1221	>	avinsert(avstore(&avs));
1222	>	n -= AMBVALSIZ;
1223	>	}
1224	>	lastpos = flen - n;
1225	>	/*** seek always as safety measure
1226	>	if (n) ***/                     /* alignment */
1227	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1228	>	goto seekerr;
1229		}
1230		n = fflush(ambfp);                      /* calls write() at last */
1231	<	fls.l_type = F_UNLCK;                   /* release file */
1232	<	fcntl(fileno(ambfp), F_SETLKW, &fls);
1231	>	if (n != EOF)
1232	>	lastpos += (long)nunflshed*AMBVALSIZ;
1233	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1234	>	goto seekerr;
1235	>
1236	>	aflock(F_UNLCK);                        /* release file */
1237	>	nunflshed = 0;
1238		return(n);
1239	+	seekerr:
1240	+	error(SYSTEM, "seek failed in ambsync");
1241	+	return -1; /* pro forma return */
1242		}
1243
1244	<	#endif
1244	>	#else   /* ! F_SETLKW */
1245	>
1246	>	int
1247	>	ambsync(void)                   /* flush ambient file */
1248	>	{
1249	>	if (ambfp == NULL)
1250	>	return(0);
1251	>	nunflshed = 0;
1252	>	return(fflush(ambfp));
1253	>	}
1254	>
1255	>	#endif  /* ! F_SETLKW */

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