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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 2.85 by greg, Tue May 6 17:15:11 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  avsum = 0.;              /* computed ambient value sum (log) */
56	+	static unsigned int  navsum = 0;        /* number of values in avsum */
57	+	static unsigned int  nambvals = 0;      /* total number of indirect values */
58	+	static unsigned int  nambshare = 0;     /* number of values from file */
59	+	static unsigned long  ambclock = 0;     /* ambient access clock */
60	+	static unsigned long  lastsort = 0;     /* time of last value sort */
61	+	static long  sortintvl = SORT_INTVL;    /* time until next sort */
62	+	static FILE  *ambinp = NULL;            /* auxiliary file for input */
63	+	static long  lastpos = -1;              /* last flush position */
64	+
65	+	#define MAXACLOCK       (1L<<30)        /* clock turnover value */
66	+	/*
67	+	* Track access times unless we are sharing ambient values
68	+	* through memory on a multiprocessor, when we want to avoid
69	+	* claiming our own memory (copy on write).  Go ahead anyway
70	+	* if more than two thirds of our values are unshared.
71	+	* Compile with -Dtracktime=0 to turn this code off.
72	+	*/
73	+	#ifndef tracktime
74	+	#define tracktime       (shm_boundary == NULL || nambvals > 3*nambshare)
75	+	#endif
76	+
77		#define  AMBFLUSH       (BUFSIZ/AMBVALSIZ)
78
79	<	#define  newambval()    (AMBVAL *)bmalloc(sizeof(AMBVAL))
79	>	#define  newambval()    (AMBVAL *)malloc(sizeof(AMBVAL))
80	>	#define  freeav(av)     free((void *)av);
81
82	<	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
82	>	static void initambfile(int creat);
83	>	static void avsave(AMBVAL *av);
84	>	static AMBVAL *avstore(AMBVAL  *aval);
85	>	static AMBTREE *newambtree(void);
86	>	static void freeambtree(AMBTREE  *atp);
87
88	<	extern long  ftell(), lseek();
89	<	static int  initambfile(), avsave(), avinsert(), ambsync();
88	>	typedef void unloadtf_t(AMBVAL *);
89	>	static unloadtf_t avinsert;
90	>	static unloadtf_t av2list;
91	>	static unloadtf_t avfree;
92	>	static void unloadatree(AMBTREE  *at, unloadtf_t *f);
93
94	+	static int aposcmp(const void *avp1, const void *avp2);
95	+	static int avlmemi(AMBVAL *avaddr);
96	+	static void sortambvals(int always);
97
98	<	setambres(ar)                           /* set ambient resolution */
99	<	int  ar;
98	>	#ifdef  F_SETLKW
99	>	static void aflock(int  typ);
100	>	#endif
101	>
102	>
103	>	void
104	>	setambres(                              /* set ambient resolution */
105	>	int  ar
106	>	)
107		{
108	+	ambres = ar < 0 ? 0 : ar;               /* may be done already */
109		/* set min & max radii */
110		if (ar <= 0) {
111	<	minarad = 0.0;
112	<	maxarad = thescene.cusize / 2.0;
111	>	minarad = 0;
112	>	maxarad = thescene.cusize*0.5;
113		} else {
114		minarad = thescene.cusize / ar;
115	<	maxarad = 16.0 * minarad;               /* heuristic */
116	<	if (maxarad > thescene.cusize / 2.0)
117	<	maxarad = thescene.cusize / 2.0;
115	>	maxarad = 64.0 * minarad;               /* heuristic */
116	>	if (maxarad > thescene.cusize*0.5)
117	>	maxarad = thescene.cusize*0.5;
118		}
119	<	if (maxarad <= FTINY)
120	<	maxarad = .001;
119	>	if (minarad <= FTINY)
120	>	minarad = 10.0*FTINY;
121	>	if (maxarad <= minarad)
122	>	maxarad = 64.0 * minarad;
123		}
124
125
126	<	setambient(afile)                       /* initialize calculation */
127	<	char  *afile;
126	>	void
127	>	setambacc(                              /* set ambient accuracy */
128	>	double  newa
129	>	)
130		{
131	<	long  headlen;
131	>	static double   olda;           /* remember previous setting here */
132	>
133	>	newa *= (newa > 0);
134	>	if (fabs(newa - olda) >= .05*(newa + olda)) {
135	>	ambacc = newa;
136	>	if (nambvals > 0)
137	>	sortambvals(1);         /* rebuild tree */
138	>	}
139	>	}
140	>
141	>
142	>	void
143	>	setambient(void)                                /* initialize calculation */
144	>	{
145	>	int     readonly = 0;
146	>	long    flen;
147		AMBVAL  amb;
148	+	/* make sure we're fresh */
149	+	ambdone();
150		/* init ambient limits */
151		setambres(ambres);
152	+	setambacc(ambacc);
153	+	if (ambfile == NULL || !ambfile[0])
154	+	return;
155	+	if (ambacc <= FTINY) {
156	+	sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
157	+	ambfile);
158	+	error(WARNING, errmsg);
159	+	return;
160	+	}
161		/* open ambient file */
162	<	if (afile != NULL)
163	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
164	<	initambfile(0);
165	<	headlen = ftell(ambfp);
166	<	while (readambval(&amb, ambfp))
167	<	avinsert(&amb, &atrunk, thescene.cuorg,
168	<	thescene.cusize);
169	<	/* align */
170	<	fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1);
171	<	} else if ((ambfp = fopen(afile, "w+")) != NULL)
172	<	initambfile(1);
173	<	else {
174	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
175	<	afile);
176	<	error(SYSTEM, errmsg);
162	>	if ((ambfp = fopen(ambfile, "r+")) == NULL)
163	>	readonly = (ambfp = fopen(ambfile, "r")) != NULL;
164	>	if (ambfp != NULL) {
165	>	initambfile(0);                 /* file exists */
166	>	lastpos = ftell(ambfp);
167	>	while (readambval(&amb, ambfp))
168	>	avinsert(avstore(&amb));
169	>	nambshare = nambvals;           /* share loaded values */
170	>	if (readonly) {
171	>	sprintf(errmsg,
172	>	"loaded %u values from read-only ambient file",
173	>	nambvals);
174	>	error(WARNING, errmsg);
175	>	fclose(ambfp);          /* close file so no writes */
176	>	ambfp = NULL;
177	>	return;                 /* avoid ambsync() */
178		}
179	+	/* align file pointer */
180	+	lastpos += (long)nambvals*AMBVALSIZ;
181	+	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
182	+	if (flen != lastpos) {
183	+	sprintf(errmsg,
184	+	"ignoring last %ld values in ambient file (corrupted)",
185	+	(flen - lastpos)/AMBVALSIZ);
186	+	error(WARNING, errmsg);
187	+	fseek(ambfp, lastpos, SEEK_SET);
188	+	#ifndef _WIN32 /* XXX we need a replacement for that one */
189	+	ftruncate(fileno(ambfp), (off_t)lastpos);
190	+	#endif
191	+	}
192	+	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
193	+	initambfile(1);                 /* else create new file */
194	+	fflush(ambfp);
195	+	lastpos = ftell(ambfp);
196	+	} else {
197	+	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
198	+	error(SYSTEM, errmsg);
199	+	}
200	+	#ifdef getc_unlocked
201	+	flockfile(ambfp);                       /* application-level lock */
202	+	#endif
203	+	#ifdef  F_SETLKW
204	+	aflock(F_UNLCK);                        /* release file */
205	+	#endif
206		}
207
208
209	<	ambnotify(obj)                  /* record new modifier */
210	<	OBJECT  obj;
209	>	void
210	>	ambdone(void)                   /* close ambient file and free memory */
211		{
212	+	if (ambfp != NULL) {            /* close ambient file */
213	+	ambsync();
214	+	fclose(ambfp);
215	+	ambfp = NULL;
216	+	if (ambinp != NULL) {
217	+	fclose(ambinp);
218	+	ambinp = NULL;
219	+	}
220	+	lastpos = -1;
221	+	}
222	+	/* free ambient tree */
223	+	unloadatree(&atrunk, &avfree);
224	+	/* reset state variables */
225	+	avsum = 0.;
226	+	navsum = 0;
227	+	nambvals = 0;
228	+	nambshare = 0;
229	+	ambclock = 0;
230	+	lastsort = 0;
231	+	sortintvl = SORT_INTVL;
232	+	}
233	+
234	+
235	+	void
236	+	ambnotify(                      /* record new modifier */
237	+	OBJECT  obj
238	+	)
239	+	{
240		static int  hitlimit = 0;
241	<	register OBJREC  *o = objptr(obj);
242	<	register char  **amblp;
241	>	OBJREC   *o;
242	>	char  **amblp;
243
244	+	if (obj == OVOID) {             /* starting over */
245	+	ambset[0] = 0;
246	+	hitlimit = 0;
247	+	return;
248	+	}
249	+	o = objptr(obj);
250		if (hitlimit || !ismodifier(o->otype))
251		return;
252		for (amblp = amblist; *amblp != NULL; amblp++)
#	Line 115 | Line 261 | OBJECT obj;
261		}
262		}
263
264	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
265
266	<	ambient(acol, r)                /* compute ambient component for ray */
267	<	COLOR  acol;
268	<	register RAY  *r;
266	>	#ifdef NEWAMB
267	>
268	>	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
269	>
270	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
271	>	AMBTREE *at, FVECT c0, double s);
272	>	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
273	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
274	>	FVECT uvw[3]);
275	>
276	>	void
277	>	multambient(            /* compute ambient component & multiply by coef. */
278	>	COLOR  aval,
279	>	RAY  *r,
280	>	FVECT  nrm
281	>	)
282		{
283		static int  rdepth = 0;                 /* ambient recursion */
284	<	double  d;
284	>	COLOR   acol;
285	>	int     ok;
286	>	double  d, l;
287
288		if (ambdiv <= 0)                        /* no ambient calculation */
289		goto dumbamb;
#	Line 134 | Line 296 | register RAY  *r;
296		goto dumbamb;
297
298		if (ambacc <= FTINY) {                  /* no ambient storage */
299	+	copycolor(acol, aval);
300		rdepth++;
301	<	d = doambient(acol, r, r->rweight, NULL, NULL);
301	>	ok = doambient(acol, r, r->rweight, NULL, NULL, NULL, NULL);
302		rdepth--;
303	<	if (d == 0.0)
303	>	if (!ok)
304		goto dumbamb;
305	+	copycolor(aval, acol);
306		return;
307		}
308	<	/* get ambient value */
308	>
309	>	if (tracktime)                          /* sort to minimize thrashing */
310	>	sortambvals(0);
311	>	/* interpolate ambient value */
312		setcolor(acol, 0.0, 0.0, 0.0);
313	<	d = sumambient(acol, r, rdepth,
313	>	d = sumambient(acol, r, nrm, rdepth,
314		&atrunk, thescene.cuorg, thescene.cusize);
315	<	if (d > FTINY)
316	<	scalecolor(acol, 1.0/d);
317	<	else {
318	<	d = makeambient(acol, r, rdepth++);
319	<	rdepth--;
315	>	if (d > FTINY) {
316	>	d = 1.0/d;
317	>	scalecolor(acol, d);
318	>	multcolor(aval, acol);
319	>	return;
320		}
321	<	if (d > FTINY)
321	>	rdepth++;                               /* need to cache new value */
322	>	ok = makeambient(acol, r, nrm, rdepth-1);
323	>	rdepth--;
324	>	if (ok) {
325	>	multcolor(aval, acol);          /* computed new value */
326		return;
327	+	}
328		dumbamb:                                        /* return global value */
329	<	copycolor(acol, ambval);
329	>	if ((ambvwt <= 0) | (navsum == 0)) {
330	>	multcolor(aval, ambval);
331	>	return;
332	>	}
333	>	l = bright(ambval);                     /* average in computations */
334	>	if (l > FTINY) {
335	>	d = (log(l)*(double)ambvwt + avsum) /
336	>	(double)(ambvwt + navsum);
337	>	d = exp(d) / l;
338	>	scalecolor(aval, d);
339	>	multcolor(aval, ambval);        /* apply color of ambval */
340	>	} else {
341	>	d = exp( avsum / (double)navsum );
342	>	scalecolor(aval, d);            /* neutral color */
343	>	}
344		}
345
346
347		double
348	<	sumambient(acol, r, al, at, c0, s)      /* get interpolated ambient value */
349	<	COLOR  acol;
350	<	register RAY  *r;
351	<	int  al;
352	<	AMBTREE  *at;
353	<	FVECT  c0;
354	<	double  s;
348	>	sumambient(             /* get interpolated ambient value */
349	>	COLOR  acol,
350	>	RAY  *r,
351	>	FVECT  rn,
352	>	int  al,
353	>	AMBTREE  *at,
354	>	FVECT  c0,
355	>	double  s
356	>	)
357	>	{                       /* initial limit is 10 degrees plus ambacc radians */
358	>	const double    minangle = 10.0 * PI/180.;
359	>	double          maxangle = minangle + ambacc;
360	>	double          wsum = 0.0;
361	>	FVECT           ck0;
362	>	int             i, j;
363	>	AMBVAL          *av;
364	>
365	>	if (at->kid != NULL) {          /* sum children first */
366	>	s *= 0.5;
367	>	for (i = 0; i < 8; i++) {
368	>	for (j = 0; j < 3; j++) {
369	>	ck0[j] = c0[j];
370	>	if (1<<j & i)
371	>	ck0[j] += s;
372	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
373	>	break;
374	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
375	>	break;
376	>	}
377	>	if (j == 3)
378	>	wsum += sumambient(acol, r, rn, al,
379	>	at->kid+i, ck0, s);
380	>	}
381	>	/* good enough? */
382	>	if (wsum >= 0.05 && s > minarad*10.0)
383	>	return(wsum);
384	>	}
385	>	/* adjust maximum angle */
386	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
387	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
388	>	/* sum this node */
389	>	for (av = at->alist; av != NULL; av = av->next) {
390	>	double  d, delta_r2, delta_t2;
391	>	COLOR   ct;
392	>	FVECT   uvw[3];
393	>	/* record access */
394	>	if (tracktime)
395	>	av->latick = ambclock;
396	>	/*
397	>	*  Ambient level test
398	>	*/
399	>	if (av->lvl > al)       /* list sorted, so this works */
400	>	break;
401	>	if (av->weight < 0.9*r->rweight)
402	>	continue;
403	>	/*
404	>	*  Direction test using unperturbed normal
405	>	*/
406	>	decodedir(uvw[2], av->ndir);
407	>	d = DOT(uvw[2], r->ron);
408	>	if (d <= 0.0)           /* >= 90 degrees */
409	>	continue;
410	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
411	>	if (delta_r2 >= maxangle*maxangle)
412	>	continue;
413	>	/*
414	>	*  Modified ray behind test
415	>	*/
416	>	VSUB(ck0, r->rop, av->pos);
417	>	d = DOT(ck0, uvw[2]);
418	>	if (d < -minarad*ambacc-.001)
419	>	continue;
420	>	d /= av->rad[0];
421	>	delta_t2 = d*d;
422	>	if (delta_t2 >= ambacc*ambacc)
423	>	continue;
424	>	/*
425	>	*  Elliptical radii test based on Hessian
426	>	*/
427	>	decodedir(uvw[0], av->udir);
428	>	VCROSS(uvw[1], uvw[2], uvw[0]);
429	>	d = DOT(ck0, uvw[0]) / av->rad[0];
430	>	delta_t2 += d*d;
431	>	d = DOT(ck0, uvw[1]) / av->rad[1];
432	>	delta_t2 += d*d;
433	>	if (delta_t2 >= ambacc*ambacc)
434	>	continue;
435	>	/*
436	>	*  Extrapolate value and compute final weight (hat function)
437	>	*/
438	>	extambient(ct, av, r->rop, rn, uvw);
439	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
440	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
441	>	scalecolor(ct, d);
442	>	addcolor(acol, ct);
443	>	wsum += d;
444	>	}
445	>	return(wsum);
446	>	}
447	>
448	>
449	>	int
450	>	makeambient(            /* make a new ambient value for storage */
451	>	COLOR  acol,
452	>	RAY  *r,
453	>	FVECT  rn,
454	>	int  al
455	>	)
456		{
457	+	AMBVAL  amb;
458	+	FVECT   uvw[3];
459	+	int     i;
460	+
461	+	amb.weight = 1.0;                       /* compute weight */
462	+	for (i = al; i-- > 0; )
463	+	amb.weight *= AVGREFL;
464	+	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
465	+	amb.weight = 1.25*r->rweight;
466	+	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
467	+	/* compute ambient */
468	+	i = doambient(acol, r, amb.weight, uvw, amb.rad, amb.gpos, amb.gdir);
469	+	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
470	+	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
471	+	return(i);
472	+	/* store value */
473	+	VCOPY(amb.pos, r->rop);
474	+	amb.ndir = encodedir(r->ron);
475	+	amb.udir = encodedir(uvw[0]);
476	+	amb.lvl = al;
477	+	copycolor(amb.val, acol);
478	+	/* insert into tree */
479	+	avsave(&amb);                           /* and save to file */
480	+	if (rn != r->ron) {                     /* texture */
481	+	VCOPY(uvw[2], r->ron);
482	+	extambient(acol, &amb, r->rop, rn, uvw);
483	+	}
484	+	return(1);
485	+	}
486	+
487	+
488	+	void
489	+	extambient(             /* extrapolate value at pv, nv */
490	+	COLOR  cr,
491	+	AMBVAL   *ap,
492	+	FVECT  pv,
493	+	FVECT  nv,
494	+	FVECT  uvw[3]
495	+	)
496	+	{
497	+	static FVECT    my_uvw[3];
498	+	FVECT           v1;
499	+	int             i;
500	+	double          d = 1.0;        /* zeroeth order */
501	+
502	+	if (uvw == NULL) {              /* need local coordinates? */
503	+	decodedir(my_uvw[2], ap->ndir);
504	+	decodedir(my_uvw[0], ap->udir);
505	+	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
506	+	uvw = my_uvw;
507	+	}
508	+	for (i = 3; i--; )              /* gradient due to translation */
509	+	d += (pv[i] - ap->pos[i]) *
510	+	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
511	+
512	+	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
513	+	for (i = 3; i--; )
514	+	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
515	+
516	+	if (d <= 0.0) {
517	+	setcolor(cr, 0.0, 0.0, 0.0);
518	+	return;
519	+	}
520	+	copycolor(cr, ap->val);
521	+	scalecolor(cr, d);
522	+	}
523	+
524	+
525	+	static void
526	+	avinsert(                               /* insert ambient value in our tree */
527	+	AMBVAL *av
528	+	)
529	+	{
530	+	AMBTREE  *at;
531	+	AMBVAL  *ap;
532	+	AMBVAL  avh;
533	+	FVECT  ck0;
534	+	double  s;
535	+	int  branch;
536	+	int  i;
537	+
538	+	if (av->rad[0] <= FTINY)
539	+	error(CONSISTENCY, "zero ambient radius in avinsert");
540	+	at = &atrunk;
541	+	VCOPY(ck0, thescene.cuorg);
542	+	s = thescene.cusize;
543	+	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
544	+	if (at->kid == NULL)
545	+	if ((at->kid = newambtree()) == NULL)
546	+	error(SYSTEM, "out of memory in avinsert");
547	+	s *= 0.5;
548	+	branch = 0;
549	+	for (i = 0; i < 3; i++)
550	+	if (av->pos[i] > ck0[i] + s) {
551	+	ck0[i] += s;
552	+	branch |= 1 << i;
553	+	}
554	+	at = at->kid + branch;
555	+	}
556	+	avh.next = at->alist;           /* order by increasing level */
557	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
558	+	if (ap->next->lvl >= av->lvl)
559	+	break;
560	+	av->next = ap->next;
561	+	ap->next = (AMBVAL*)av;
562	+	at->alist = avh.next;
563	+	}
564	+
565	+
566	+	#else /* ! NEWAMB */
567	+
568	+	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
569	+	AMBTREE *at, FVECT c0, double s);
570	+	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
571	+	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
572	+
573	+
574	+	void
575	+	multambient(            /* compute ambient component & multiply by coef. */
576	+	COLOR  aval,
577	+	RAY  *r,
578	+	FVECT  nrm
579	+	)
580	+	{
581	+	static int  rdepth = 0;                 /* ambient recursion */
582	+	COLOR   acol;
583	+	double  d, l;
584	+
585	+	if (ambdiv <= 0)                        /* no ambient calculation */
586	+	goto dumbamb;
587	+	/* check number of bounces */
588	+	if (rdepth >= ambounce)
589	+	goto dumbamb;
590	+	/* check ambient list */
591	+	if (ambincl != -1 && r->ro != NULL &&
592	+	ambincl != inset(ambset, r->ro->omod))
593	+	goto dumbamb;
594	+
595	+	if (ambacc <= FTINY) {                  /* no ambient storage */
596	+	copycolor(acol, aval);
597	+	rdepth++;
598	+	d = doambient(acol, r, r->rweight, NULL, NULL);
599	+	rdepth--;
600	+	if (d <= FTINY)
601	+	goto dumbamb;
602	+	copycolor(aval, acol);
603	+	return;
604	+	}
605	+
606	+	if (tracktime)                          /* sort to minimize thrashing */
607	+	sortambvals(0);
608	+	/* interpolate ambient value */
609	+	setcolor(acol, 0.0, 0.0, 0.0);
610	+	d = sumambient(acol, r, nrm, rdepth,
611	+	&atrunk, thescene.cuorg, thescene.cusize);
612	+	if (d > FTINY) {
613	+	d = 1.0/d;
614	+	scalecolor(acol, d);
615	+	multcolor(aval, acol);
616	+	return;
617	+	}
618	+	rdepth++;                               /* need to cache new value */
619	+	d = makeambient(acol, r, nrm, rdepth-1);
620	+	rdepth--;
621	+	if (d > FTINY) {
622	+	multcolor(aval, acol);          /* got new value */
623	+	return;
624	+	}
625	+	dumbamb:                                        /* return global value */
626	+	if ((ambvwt <= 0) | (navsum == 0)) {
627	+	multcolor(aval, ambval);
628	+	return;
629	+	}
630	+	l = bright(ambval);                     /* average in computations */
631	+	if (l > FTINY) {
632	+	d = (log(l)*(double)ambvwt + avsum) /
633	+	(double)(ambvwt + navsum);
634	+	d = exp(d) / l;
635	+	scalecolor(aval, d);
636	+	multcolor(aval, ambval);        /* apply color of ambval */
637	+	} else {
638	+	d = exp( avsum / (double)navsum );
639	+	scalecolor(aval, d);            /* neutral color */
640	+	}
641	+	}
642	+
643	+
644	+	static double
645	+	sumambient(     /* get interpolated ambient value */
646	+	COLOR  acol,
647	+	RAY  *r,
648	+	FVECT  rn,
649	+	int  al,
650	+	AMBTREE  *at,
651	+	FVECT  c0,
652	+	double  s
653	+	)
654	+	{
655		double  d, e1, e2, wt, wsum;
656		COLOR  ct;
657		FVECT  ck0;
658		int  i;
659	<	register int  j;
660	<	register AMBVAL  *av;
661	<	/* do this node */
659	>	int  j;
660	>	AMBVAL   *av;
661	>
662		wsum = 0.0;
663	+	/* do this node */
664		for (av = at->alist; av != NULL; av = av->next) {
665	+	double  rn_dot = -2.0;
666	+	if (tracktime)
667	+	av->latick = ambclock;
668		/*
669		*  Ambient level test.
670		*/
671	<	if (av->lvl > al || av->weight < r->rweight-FTINY)
671	>	if (av->lvl > al)       /* list sorted, so this works */
672	>	break;
673	>	if (av->weight < 0.9*r->rweight)
674		continue;
675		/*
676		*  Ambient radius test.
677		*/
678	<	e1 = 0.0;
679	<	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;
678	>	VSUB(ck0, av->pos, r->rop);
679	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
680		if (e1 > ambacc*ambacc*1.21)
681		continue;
682		/*
683	<	*  Normal direction test.
683	>	*  Direction test using closest normal.
684		*/
685	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
686	<	if (e2 < 0.0) e2 = 0.0;
687	<	if (e1 + e2 > ambacc*ambacc*1.21)
685	>	d = DOT(av->dir, r->ron);
686	>	if (rn != r->ron) {
687	>	rn_dot = DOT(av->dir, rn);
688	>	if (rn_dot > 1.0-FTINY)
689	>	rn_dot = 1.0-FTINY;
690	>	if (rn_dot >= d-FTINY) {
691	>	d = rn_dot;
692	>	rn_dot = -2.0;
693	>	}
694	>	}
695	>	e2 = (1.0 - d) * r->rweight;
696	>	if (e2 < 0.0)
697	>	e2 = 0.0;
698	>	else if (e1 + e2 > ambacc*ambacc*1.21)
699		continue;
700		/*
701		*  Ray behind test.
#	Line 211 | Line 709 | double s;
709		/*
710		*  Jittering final test reduces image artifacts.
711		*/
712	<	wt = sqrt(e1) + sqrt(e2);
713	<	wt *= .9 + .2*urand(9015+samplendx);
714	<	if (wt > ambacc)
712	>	e1 = sqrt(e1);
713	>	e2 = sqrt(e2);
714	>	wt = e1 + e2;
715	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
716		continue;
717	+	/*
718	+	*  Recompute directional error using perturbed normal
719	+	*/
720	+	if (rn_dot > 0.0) {
721	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
722	+	wt = e1 + e2;
723	+	}
724		if (wt <= 1e-3)
725		wt = 1e3;
726		else
727		wt = 1.0 / wt;
728		wsum += wt;
729	<	extambient(ct, av, r->rop, r->ron);
729	>	extambient(ct, av, r->rop, rn);
730		scalecolor(ct, wt);
731		addcolor(acol, ct);
732		}
#	Line 239 | Line 745 | double s;
745		break;
746		}
747		if (j == 3)
748	<	wsum += sumambient(acol, r, al, at->kid+i, ck0, s);
748	>	wsum += sumambient(acol, r, rn, al,
749	>	at->kid+i, ck0, s);
750		}
751		return(wsum);
752		}
753
754
755	<	double
756	<	makeambient(acol, r, al)        /* make a new ambient value */
757	<	COLOR  acol;
758	<	register RAY  *r;
759	<	int  al;
755	>	static double
756	>	makeambient(            /* make a new ambient value for storage */
757	>	COLOR  acol,
758	>	RAY  *r,
759	>	FVECT  rn,
760	>	int  al
761	>	)
762		{
763		AMBVAL  amb;
764		FVECT   gp, gd;
765	<	/* compute weight */
766	<	amb.weight = pow(AVGREFL, (double)al);
767	<	if (r->rweight < 0.2*amb.weight)        /* heuristic */
768	<	amb.weight = r->rweight;
765	>	int     i;
766	>
767	>	amb.weight = 1.0;                       /* compute weight */
768	>	for (i = al; i-- > 0; )
769	>	amb.weight *= AVGREFL;
770	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
771	>	amb.weight = 1.25*r->rweight;
772	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
773		/* compute ambient */
774		amb.rad = doambient(acol, r, amb.weight, gp, gd);
775	<	if (amb.rad == 0.0)
775	>	if (amb.rad <= FTINY) {
776	>	setcolor(acol, 0.0, 0.0, 0.0);
777		return(0.0);
778	<	/* store it */
778	>	}
779	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
780	>	/* store value */
781		VCOPY(amb.pos, r->rop);
782		VCOPY(amb.dir, r->ron);
783		amb.lvl = al;
#	Line 270 | Line 786 | int  al;
786		VCOPY(amb.gdir, gd);
787		/* insert into tree */
788		avsave(&amb);                           /* and save to file */
789	+	if (rn != r->ron)
790	+	extambient(acol, &amb, r->rop, rn);     /* texture */
791		return(amb.rad);
792		}
793
794
795	<	extambient(cr, ap, pv, nv)              /* extrapolate value at pv, nv */
796	<	COLOR  cr;
797	<	register AMBVAL  *ap;
798	<	FVECT  pv, nv;
795	>	static void
796	>	extambient(             /* extrapolate value at pv, nv */
797	>	COLOR  cr,
798	>	AMBVAL   *ap,
799	>	FVECT  pv,
800	>	FVECT  nv
801	>	)
802		{
803	<	FVECT  v1, v2;
804	<	register int  i;
803	>	FVECT  v1;
804	>	int  i;
805		double  d;
806
807		d = 1.0;                        /* zeroeth order */
#	Line 288 | Line 809 | FVECT  pv, nv;
809		for (i = 0; i < 3; i++)
810		d += ap->gpos[i]*(pv[i]-ap->pos[i]);
811		/* gradient due to rotation */
812	<	VCOPY(v1, ap->dir);
813	<	fcross(v2, v1, nv);
293	<	d += DOT(ap->gdir, v2);
812	>	VCROSS(v1, ap->dir, nv);
813	>	d += DOT(ap->gdir, v1);
814		if (d <= 0.0) {
815		setcolor(cr, 0.0, 0.0, 0.0);
816		return;
#	Line 300 | Line 820 | FVECT  pv, nv;
820		}
821
822
823	<	static
824	<	initambfile(creat)              /* initialize ambient file */
825	<	int  creat;
823	>	static void
824	>	avinsert(                               /* insert ambient value in our tree */
825	>	AMBVAL *av
826	>	)
827		{
828	<	extern char  *progname, *octname, VersionID[];
828	>	AMBTREE  *at;
829	>	AMBVAL  *ap;
830	>	AMBVAL  avh;
831	>	FVECT  ck0;
832	>	double  s;
833	>	int  branch;
834	>	int  i;
835
836	<	#ifdef MSDOS
837	<	setmode(fileno(ambfp), O_BINARY);
836	>	if (av->rad <= FTINY)
837	>	error(CONSISTENCY, "zero ambient radius in avinsert");
838	>	at = &atrunk;
839	>	VCOPY(ck0, thescene.cuorg);
840	>	s = thescene.cusize;
841	>	while (s*(OCTSCALE/2) > av->rad*ambacc) {
842	>	if (at->kid == NULL)
843	>	if ((at->kid = newambtree()) == NULL)
844	>	error(SYSTEM, "out of memory in avinsert");
845	>	s *= 0.5;
846	>	branch = 0;
847	>	for (i = 0; i < 3; i++)
848	>	if (av->pos[i] > ck0[i] + s) {
849	>	ck0[i] += s;
850	>	branch |= 1 << i;
851	>	}
852	>	at = at->kid + branch;
853	>	}
854	>	avh.next = at->alist;           /* order by increasing level */
855	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
856	>	if (ap->next->lvl >= av->lvl)
857	>	break;
858	>	av->next = ap->next;
859	>	ap->next = (AMBVAL*)av;
860	>	at->alist = avh.next;
861	>	}
862	>
863	>	#endif  /* ! NEWAMB */
864	>
865	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
866	>
867	>	static void
868	>	initambfile(            /* initialize ambient file */
869	>	int  cre8
870	>	)
871	>	{
872	>	extern char  *progname, *octname;
873	>	static char  *mybuf = NULL;
874	>
875	>	#ifdef  F_SETLKW
876	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
877		#endif
878	<	setbuf(ambfp, bmalloc(BUFSIZ));
879	<	if (creat) {                    /* new file */
880	<	fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ",
878	>	SET_FILE_BINARY(ambfp);
879	>	if (mybuf == NULL)
880	>	mybuf = (char *)bmalloc(BUFSIZ+8);
881	>	setbuf(ambfp, mybuf);
882	>	if (cre8) {                     /* new file */
883	>	newheader("RADIANCE", ambfp);
884	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
885		progname, colval(ambval,RED),
886		colval(ambval,GRN), colval(ambval,BLU),
887	<	ambounce, ambacc);
888	<	fprintf(ambfp, "-ad %d -as %d -ar %d %s\n",
889	<	ambdiv, ambssamp, ambres,
890	<	octname==NULL ? "" : octname);
887	>	ambvwt, ambounce, ambacc);
888	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
889	>	ambdiv, ambssamp, ambres);
890	>	if (octname != NULL)
891	>	fputs(octname, ambfp);
892	>	fputc('\n', ambfp);
893		fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
894	+	fputnow(ambfp);
895		fputformat(AMBFMT, ambfp);
896	<	putc('\n', ambfp);
896	>	fputc('\n', ambfp);
897		putambmagic(ambfp);
325	–	fflush(ambfp);
326	–	#ifndef  NIX
327	–	sync();                 /* protect against NFS buffering */
328	–	#endif
898		} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
899		error(USER, "bad ambient file");
900		}
901
902
903	<	static
904	<	avsave(av)                              /* insert and save an ambient value */
905	<	AMBVAL  *av;
903	>	static void
904	>	avsave(                         /* insert and save an ambient value */
905	>	AMBVAL  *av
906	>	)
907		{
908	<	static int  nunflshed = 0;
339	<
340	<	avinsert(av, &atrunk, thescene.cuorg, thescene.cusize);
908	>	avinsert(avstore(av));
909		if (ambfp == NULL)
910		return;
911		if (writambval(av, ambfp) < 0)
912		goto writerr;
913	<	if (++nunflshed >= AMBFLUSH) {
913	>	if (++nunflshed >= AMBFLUSH)
914		if (ambsync() == EOF)
915		goto writerr;
348	–	nunflshed = 0;
349	–	}
916		return;
917		writerr:
918	<	error(SYSTEM, "error writing ambient file");
918	>	error(SYSTEM, "error writing to ambient file");
919		}
920
921
922	<	static
923	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
924	<	AMBVAL  *aval;
925	<	register AMBTREE  *at;
360	<	FVECT  c0;
361	<	double  s;
922	>	static AMBVAL *
923	>	avstore(                                /* allocate memory and store aval */
924	>	AMBVAL  *aval
925	>	)
926		{
927	<	FVECT  ck0;
928	<	int  branch;
365	<	register AMBVAL  *av;
366	<	register int  i;
927	>	AMBVAL  *av;
928	>	double  d;
929
930		if ((av = newambval()) == NULL)
931	<	goto memerr;
932	<	copystruct(av, aval);
933	<	VCOPY(ck0, c0);
934	<	while (s*(OCTSCALE/2) > av->rad*ambacc) {
935	<	if (at->kid == NULL)
936	<	if ((at->kid = newambtree()) == NULL)
937	<	goto memerr;
938	<	s *= 0.5;
939	<	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;
931	>	error(SYSTEM, "out of memory in avstore");
932	>	*av = *aval;
933	>	av->latick = ambclock;
934	>	av->next = NULL;
935	>	nambvals++;
936	>	d = bright(av->val);
937	>	if (d > FTINY) {                /* add to log sum for averaging */
938	>	avsum += log(d);
939	>	navsum++;
940		}
941	<	av->next = at->alist;
386	<	at->alist = av;
387	<	return;
388	<	memerr:
389	<	error(SYSTEM, "out of memory in avinsert");
941	>	return(av);
942		}
943
944
945	<	#ifdef  NIX
945	>	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
946
947	<	static
948	<	ambsync()                       /* flush ambient file */
947	>	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
948	>
949	>
950	>	static AMBTREE *
951	>	newambtree(void)                                /* allocate 8 ambient tree structs */
952		{
953	<	return(fflush(ambfp));
953	>	AMBTREE  *atp, *upperlim;
954	>
955	>	if (atfreelist == NULL) {       /* get more nodes */
956	>	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
957	>	if (atfreelist == NULL)
958	>	return(NULL);
959	>	/* link new free list */
960	>	upperlim = atfreelist + 8*(ATALLOCSZ-1);
961	>	for (atp = atfreelist; atp < upperlim; atp += 8)
962	>	atp->kid = atp + 8;
963	>	atp->kid = NULL;
964	>	}
965	>	atp = atfreelist;
966	>	atfreelist = atp->kid;
967	>	memset((char *)atp, '\0', 8*sizeof(AMBTREE));
968	>	return(atp);
969		}
970
401	–	#else
971
972	<	#include  <sys/types.h>
973	<	#include  <sys/stat.h>
972	>	static void
973	>	freeambtree(                    /* free 8 ambient tree structs */
974	>	AMBTREE  *atp
975	>	)
976	>	{
977	>	atp->kid = atfreelist;
978	>	atfreelist = atp;
979	>	}
980
981	<	static
982	<	ambsync()                       /* synchronize ambient file */
981	>
982	>	static void
983	>	unloadatree(                    /* unload an ambient value tree */
984	>	AMBTREE  *at,
985	>	unloadtf_t *f
986	>	)
987		{
988	<	static FILE  *ambinp = NULL;
989	<	struct flock  fls;
990	<	struct stat  sts;
991	<	#define flen    sts.st_size
992	<	AMBVAL  avs;
993	<	long  lastpos;
994	<	register int  n;
995	<	/* gain exclusive access */
996	<	fls.l_type = F_WRLCK;
997	<	fls.l_whence = 0;
998	<	fls.l_start = 0L;
999	<	fls.l_len = 0L;
988	>	AMBVAL  *av;
989	>	int  i;
990	>	/* transfer values at this node */
991	>	for (av = at->alist; av != NULL; av = at->alist) {
992	>	at->alist = av->next;
993	>	(*f)(av);
994	>	}
995	>	if (at->kid == NULL)
996	>	return;
997	>	for (i = 0; i < 8; i++)         /* transfer and free children */
998	>	unloadatree(at->kid+i, f);
999	>	freeambtree(at->kid);
1000	>	at->kid = NULL;
1001	>	}
1002	>
1003	>
1004	>	static struct avl {
1005	>	AMBVAL  *p;
1006	>	unsigned long   t;
1007	>	}       *avlist1;                       /* ambient value list with ticks */
1008	>	static AMBVAL   **avlist2;              /* memory positions for sorting */
1009	>	static int      i_avlist;               /* index for lists */
1010	>
1011	>	static int alatcmp(const void *av1, const void *av2);
1012	>
1013	>	static void
1014	>	avfree(AMBVAL *av)
1015	>	{
1016	>	free(av);
1017	>	}
1018	>
1019	>	static void
1020	>	av2list(
1021	>	AMBVAL *av
1022	>	)
1023	>	{
1024	>	#ifdef DEBUG
1025	>	if (i_avlist >= nambvals)
1026	>	error(CONSISTENCY, "too many ambient values in av2list1");
1027	>	#endif
1028	>	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1029	>	avlist1[i_avlist++].t = av->latick;
1030	>	}
1031	>
1032	>
1033	>	static int
1034	>	alatcmp(                        /* compare ambient values for MRA */
1035	>	const void *av1,
1036	>	const void *av2
1037	>	)
1038	>	{
1039	>	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1040	>	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1041	>	}
1042	>
1043	>
1044	>	/* GW NOTE 2002/10/3:
1045	>	* I used to compare AMBVAL pointers, but found that this was the
1046	>	* cause of a serious consistency error with gcc, since the optimizer
1047	>	* uses some dangerous trick in pointer subtraction that
1048	>	* assumes pointers differ by exact struct size increments.
1049	>	*/
1050	>	static int
1051	>	aposcmp(                        /* compare ambient value positions */
1052	>	const void      *avp1,
1053	>	const void      *avp2
1054	>	)
1055	>	{
1056	>	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1057	>	if (diff < 0)
1058	>	return(-1);
1059	>	return(diff > 0);
1060	>	}
1061	>
1062	>
1063	>	static int
1064	>	avlmemi(                                /* find list position from address */
1065	>	AMBVAL  *avaddr
1066	>	)
1067	>	{
1068	>	AMBVAL  **avlpp;
1069	>
1070	>	avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2,
1071	>	nambvals, sizeof(AMBVAL *), &aposcmp);
1072	>	if (avlpp == NULL)
1073	>	error(CONSISTENCY, "address not found in avlmemi");
1074	>	return(avlpp - avlist2);
1075	>	}
1076	>
1077	>
1078	>	static void
1079	>	sortambvals(                    /* resort ambient values */
1080	>	int     always
1081	>	)
1082	>	{
1083	>	AMBTREE  oldatrunk;
1084	>	AMBVAL  tav, *tap, *pnext;
1085	>	int     i, j;
1086	>	/* see if it's time yet */
1087	>	if (!always && (ambclock++ < lastsort+sortintvl ||
1088	>	nambvals < SORT_THRESH))
1089	>	return;
1090	>	/*
1091	>	* The idea here is to minimize memory thrashing
1092	>	* in VM systems by improving reference locality.
1093	>	* We do this by periodically sorting our stored ambient
1094	>	* values in memory in order of most recently to least
1095	>	* recently accessed.  This ordering was chosen so that new
1096	>	* ambient values (which tend to be less important) go into
1097	>	* higher memory with the infrequently accessed values.
1098	>	*      Since we expect our values to need sorting less
1099	>	* frequently as the process continues, we double our
1100	>	* waiting interval after each call.
1101	>	*      This routine is also called by setambacc() with
1102	>	* the "always" parameter set to 1 so that the ambient
1103	>	* tree will be rebuilt with the new accuracy parameter.
1104	>	*/
1105	>	if (tracktime) {                /* allocate pointer arrays to sort */
1106	>	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1107	>	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1108	>	} else {
1109	>	avlist2 = NULL;
1110	>	avlist1 = NULL;
1111	>	}
1112	>	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1113	>	if (avlist2 != NULL)
1114	>	free((void *)avlist2);
1115	>	if (always) {           /* rebuild without sorting */
1116	>	oldatrunk = atrunk;
1117	>	atrunk.alist = NULL;
1118	>	atrunk.kid = NULL;
1119	>	unloadatree(&oldatrunk, &avinsert);
1120	>	}
1121	>	} else {                        /* sort memory by last access time */
1122	>	/*
1123	>	* Sorting memory is tricky because it isn't contiguous.
1124	>	* We have to sort an array of pointers by MRA and also
1125	>	* by memory position.  We then copy values in "loops"
1126	>	* to minimize memory hits.  Nevertheless, we will visit
1127	>	* everyone at least twice, and this is an expensive process
1128	>	* when we're thrashing, which is when we need to do it.
1129	>	*/
1130	>	#ifdef DEBUG
1131	>	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1132	>	nambvals, ambclock);
1133	>	eputs(errmsg);
1134	>	#endif
1135	>	i_avlist = 0;
1136	>	unloadatree(&atrunk, &av2list); /* empty current tree */
1137	>	#ifdef DEBUG
1138	>	if (i_avlist < nambvals)
1139	>	error(CONSISTENCY, "missing ambient values in sortambvals");
1140	>	#endif
1141	>	qsort((char *)avlist1, nambvals, sizeof(struct avl), &alatcmp);
1142	>	qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), &aposcmp);
1143	>	for (i = 0; i < nambvals; i++) {
1144	>	if (avlist1[i].p == NULL)
1145	>	continue;
1146	>	tap = avlist2[i];
1147	>	tav = *tap;
1148	>	for (j = i; (pnext = avlist1[j].p) != tap;
1149	>	j = avlmemi(pnext)) {
1150	>	*(avlist2[j]) = *pnext;
1151	>	avinsert(avlist2[j]);
1152	>	avlist1[j].p = NULL;
1153	>	}
1154	>	*(avlist2[j]) = tav;
1155	>	avinsert(avlist2[j]);
1156	>	avlist1[j].p = NULL;
1157	>	}
1158	>	free((void *)avlist1);
1159	>	free((void *)avlist2);
1160	>	/* compute new sort interval */
1161	>	sortintvl = ambclock - lastsort;
1162	>	if (sortintvl >= MAX_SORT_INTVL/2)
1163	>	sortintvl = MAX_SORT_INTVL;
1164	>	else
1165	>	sortintvl <<= 1;        /* wait twice as long next */
1166	>	#ifdef DEBUG
1167	>	eputs("done\n");
1168	>	#endif
1169	>	}
1170	>	if (ambclock >= MAXACLOCK)
1171	>	ambclock = MAXACLOCK/2;
1172	>	lastsort = ambclock;
1173	>	}
1174	>
1175	>
1176	>	#ifdef  F_SETLKW
1177	>
1178	>	static void
1179	>	aflock(                 /* lock/unlock ambient file */
1180	>	int  typ
1181	>	)
1182	>	{
1183	>	static struct flock  fls;       /* static so initialized to zeroes */
1184	>
1185	>	if (typ == fls.l_type)          /* already called? */
1186	>	return;
1187	>	fls.l_type = typ;
1188		if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1189	<	error(SYSTEM, "cannot lock ambient file");
1189	>	error(SYSTEM, "cannot (un)lock ambient file");
1190	>	}
1191	>
1192	>
1193	>	int
1194	>	ambsync(void)                   /* synchronize ambient file */
1195	>	{
1196	>	long  flen;
1197	>	AMBVAL  avs;
1198	>	int  n;
1199	>
1200	>	if (ambfp == NULL)      /* no ambient file? */
1201	>	return(0);
1202	>	/* gain appropriate access */
1203	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1204		/* see if file has grown */
1205	<	lastpos = lseek(fileno(ambfp), 0L, 1);  /* get previous position */
1206	<	if (fstat(fileno(ambfp), &sts) < 0)     /* get current length */
1207	<	error(SYSTEM, "cannot stat ambient file");
1208	<	if (n = (flen - lastpos)/AMBVALSIZ) {   /* file has grown */
428	<	if (ambinp == NULL) {           /* use duplicate file */
1205	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1206	>	goto seekerr;
1207	>	if ((n = flen - lastpos) > 0) {         /* file has grown */
1208	>	if (ambinp == NULL) {           /* use duplicate filedes */
1209		ambinp = fdopen(dup(fileno(ambfp)), "r");
1210		if (ambinp == NULL)
1211		error(SYSTEM, "fdopen failed in ambsync");
1212		}
1213	<	while (n--) {                   /* load contributed values */
1214	<	readambval(&avs, ambinp);
1215	<	avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize);
1216	<	}                               /* moves shared file pointer */
1217	<	if (n = (flen - lastpos)%AMBVALSIZ)     /* alignment */
1218	<	lseek(fileno(ambfp), flen-n, 0);
1213	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1214	>	goto seekerr;
1215	>	while (n >= AMBVALSIZ) {        /* load contributed values */
1216	>	if (!readambval(&avs, ambinp)) {
1217	>	sprintf(errmsg,
1218	>	"ambient file \"%s\" corrupted near character %ld",
1219	>	ambfile, flen - n);
1220	>	error(WARNING, errmsg);
1221	>	break;
1222	>	}
1223	>	avinsert(avstore(&avs));
1224	>	n -= AMBVALSIZ;
1225	>	}
1226	>	lastpos = flen - n;
1227	>	/*** seek always as safety measure
1228	>	if (n) ***/                     /* alignment */
1229	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1230	>	goto seekerr;
1231		}
1232		n = fflush(ambfp);                      /* calls write() at last */
1233	<	fls.l_type = F_UNLCK;                   /* release file */
1234	<	fcntl(fileno(ambfp), F_SETLKW, &fls);
1233	>	if (n != EOF)
1234	>	lastpos += (long)nunflshed*AMBVALSIZ;
1235	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1236	>	goto seekerr;
1237	>
1238	>	aflock(F_UNLCK);                        /* release file */
1239	>	nunflshed = 0;
1240		return(n);
1241	+	seekerr:
1242	+	error(SYSTEM, "seek failed in ambsync");
1243	+	return -1; /* pro forma return */
1244		}
1245
1246	<	#endif
1246	>	#else   /* ! F_SETLKW */
1247	>
1248	>	int
1249	>	ambsync(void)                   /* flush ambient file */
1250	>	{
1251	>	if (ambfp == NULL)
1252	>	return(0);
1253	>	nunflshed = 0;
1254	>	return(fflush(ambfp));
1255	>	}
1256	>
1257	>	#endif  /* ! F_SETLKW */

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