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

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.6 by greg, Thu Jul 16 12:09:08 1992 UTC vs.
Revision 2.96 by rschregle, Wed Jul 29 18:57:03 2015 UTC

#	Line 1 | Line 1
1	<	/* Copyright (c) 1991 Regents of the University of California */
2	<
3	<	#ifndef lint
4	<	static char SCCSid[] = "$SunId$ LBL";
5	<	#endif
6	<
1	>	static const char       RCSid[] = "$Id$";
2		/*
3		*  ambient.c - routines dealing with ambient (inter-reflected) component.
4		*
5	<	*  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
5	>	*  Declarations of external symbols in ambient.h
6		*/
7
8	<	#include  "ray.h"
8	>	#include "copyright.h"
9
10	<	#include  "octree.h"
10	>	#include <string.h>
11
12	+	#include  "platform.h"
13	+	#include  "ray.h"
14		#include  "otypes.h"
15	<
15	>	#include  "resolu.h"
16		#include  "ambient.h"
23	–
17		#include  "random.h"
18	+	#include  "pmapamb.h"
19
20	<	#define  OCTSCALE       0.5     /* ceil((valid rad.)/(cube size)) */
20	>	#ifndef  OCTSCALE
21	>	#define  OCTSCALE       1.0     /* ceil((valid rad.)/(cube size)) */
22	>	#endif
23
24	<	typedef struct ambtree {
29	<	AMBVAL  *alist;         /* ambient value list */
30	<	struct ambtree  *kid;   /* 8 child nodes */
31	<	}  AMBTREE;                     /* ambient octree */
24	>	extern char  *shm_boundary;     /* memory sharing boundary */
25
26	<	extern CUBE  thescene;          /* contains space boundaries */
26	>	#ifndef  MAXASET
27	>	#define  MAXASET        4095    /* maximum number of elements in ambient set */
28	>	#endif
29	>	OBJECT  ambset[MAXASET+1]={0};  /* ambient include/exclude set */
30
31	<	#define  MAXASET        511     /* maximum number of elements in ambient set */
32	<	OBJECT  ambset[MAXASET+1]={0};  /* ambient include/exclude set */
31	>	double  maxarad;                /* maximum ambient radius */
32	>	double  minarad;                /* minimum ambient radius */
33
34	<	double  maxarad;                /* maximum ambient radius */
39	<	double  minarad;                /* minimum ambient radius */
34	>	static AMBTREE  atrunk;         /* our ambient trunk node */
35
41	–	static AMBTREE  atrunk;         /* our ambient trunk node */
42	–
36		static FILE  *ambfp = NULL;     /* ambient file pointer */
37	<	static int  ambheadlen;         /* length of ambient file header */
37	>	static int  nunflshed = 0;      /* number of unflushed ambient values */
38
39	<	#define  AMBFLUSH       (BUFSIZ/AMBVALSIZ)
39	>	#ifndef SORT_THRESH
40	>	#ifdef SMLMEM
41	>	#define SORT_THRESH     ((16L<<20)/sizeof(AMBVAL))
42	>	#else
43	>	#define SORT_THRESH     ((64L<<20)/sizeof(AMBVAL))
44	>	#endif
45	>	#endif
46	>	#ifndef SORT_INTVL
47	>	#define SORT_INTVL      (SORT_THRESH<<1)
48	>	#endif
49	>	#ifndef MAX_SORT_INTVL
50	>	#define MAX_SORT_INTVL  (SORT_INTVL<<6)
51	>	#endif
52
48	–	#define  newambval()    (AMBVAL *)bmalloc(sizeof(AMBVAL))
53
54	<	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
54	>	static double  avsum = 0.;              /* computed ambient value sum (log) */
55	>	static unsigned int  navsum = 0;        /* number of values in avsum */
56	>	static unsigned int  nambvals = 0;      /* total number of indirect values */
57	>	static unsigned int  nambshare = 0;     /* number of values from file */
58	>	static unsigned long  ambclock = 0;     /* ambient access clock */
59	>	static unsigned long  lastsort = 0;     /* time of last value sort */
60	>	static long  sortintvl = SORT_INTVL;    /* time until next sort */
61	>	static FILE  *ambinp = NULL;            /* auxiliary file for input */
62	>	static long  lastpos = -1;              /* last flush position */
63
64	+	#define MAXACLOCK       (1L<<30)        /* clock turnover value */
65	+	/*
66	+	* Track access times unless we are sharing ambient values
67	+	* through memory on a multiprocessor, when we want to avoid
68	+	* claiming our own memory (copy on write).  Go ahead anyway
69	+	* if more than two thirds of our values are unshared.
70	+	* Compile with -Dtracktime=0 to turn this code off.
71	+	*/
72	+	#ifndef tracktime
73	+	#define tracktime       (shm_boundary == NULL || nambvals > 3*nambshare)
74	+	#endif
75
76	<	setambres(ar)                           /* set ambient resolution */
77	<	int  ar;
76	>	#define  AMBFLUSH       (BUFSIZ/AMBVALSIZ)
77	>
78	>	#define  newambval()    (AMBVAL *)malloc(sizeof(AMBVAL))
79	>	#define  freeav(av)     free((void *)av);
80	>
81	>	static void initambfile(int creat);
82	>	static void avsave(AMBVAL *av);
83	>	static AMBVAL *avstore(AMBVAL  *aval);
84	>	static AMBTREE *newambtree(void);
85	>	static void freeambtree(AMBTREE  *atp);
86	>
87	>	typedef void unloadtf_t(AMBVAL *);
88	>	static unloadtf_t avinsert;
89	>	static unloadtf_t av2list;
90	>	static unloadtf_t avfree;
91	>	static void unloadatree(AMBTREE  *at, unloadtf_t *f);
92	>
93	>	static int aposcmp(const void *avp1, const void *avp2);
94	>	static int avlmemi(AMBVAL *avaddr);
95	>	static void sortambvals(int always);
96	>
97	>	#ifdef  F_SETLKW
98	>	static void aflock(int  typ);
99	>	#endif
100	>
101	>
102	>	void
103	>	setambres(                              /* set ambient resolution */
104	>	int  ar
105	>	)
106		{
107	+	ambres = ar < 0 ? 0 : ar;               /* may be done already */
108		/* set min & max radii */
109		if (ar <= 0) {
110	<	minarad = 0.0;
111	<	maxarad = thescene.cusize / 2.0;
110	>	minarad = 0;
111	>	maxarad = thescene.cusize*0.2;
112		} else {
113		minarad = thescene.cusize / ar;
114	<	maxarad = 16.0 * minarad;               /* heuristic */
115	<	if (maxarad > thescene.cusize / 2.0)
116	<	maxarad = thescene.cusize / 2.0;
114	>	maxarad = 64.0 * minarad;               /* heuristic */
115	>	if (maxarad > thescene.cusize*0.2)
116	>	maxarad = thescene.cusize*0.2;
117		}
118	<	if (maxarad <= FTINY)
119	<	maxarad = .001;
118	>	if (minarad <= FTINY)
119	>	minarad = 10.0*FTINY;
120	>	if (maxarad <= minarad)
121	>	maxarad = 64.0 * minarad;
122		}
123
124
125	<	setambient(afile)                       /* initialize calculation */
126	<	char  *afile;
125	>	void
126	>	setambacc(                              /* set ambient accuracy */
127	>	double  newa
128	>	)
129		{
130	<	extern long  ftell();
131	<	AMBVAL  amb;
130	>	static double   olda;           /* remember previous setting here */
131	>
132	>	newa *= (newa > 0);
133	>	if (fabs(newa - olda) >= .05*(newa + olda)) {
134	>	ambacc = newa;
135	>	if (nambvals > 0)
136	>	sortambvals(1);         /* rebuild tree */
137	>	}
138	>	}
139	>
140	>
141	>	void
142	>	setambient(void)                                /* initialize calculation */
143	>	{
144	>	int     readonly = 0;
145	>	long    flen;
146	>	AMBVAL  amb;
147	>	/* make sure we're fresh */
148	>	ambdone();
149		/* init ambient limits */
150		setambres(ambres);
151	+	setambacc(ambacc);
152	+	if (ambfile == NULL || !ambfile[0])
153	+	return;
154	+	if (ambacc <= FTINY) {
155	+	sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
156	+	ambfile);
157	+	error(WARNING, errmsg);
158	+	return;
159	+	}
160		/* open ambient file */
161	<	if (afile != NULL)
162	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
163	<	initambfile(0);
164	<	while (readambval(&amb, ambfp))
165	<	avinsert(&amb, &atrunk, thescene.cuorg,
166	<	thescene.cusize);
167	<	/* align */
168	<	fseek(ambfp, -((ftell(ambfp)-ambheadlen)%AMBVALSIZ), 1);
169	<	} else if ((ambfp = fopen(afile, "w")) != NULL)
170	<	initambfile(1);
171	<	else {
172	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
173	<	afile);
174	<	error(SYSTEM, errmsg);
161	>	if ((ambfp = fopen(ambfile, "r+")) == NULL)
162	>	readonly = (ambfp = fopen(ambfile, "r")) != NULL;
163	>	if (ambfp != NULL) {
164	>	initambfile(0);                 /* file exists */
165	>	lastpos = ftell(ambfp);
166	>	while (readambval(&amb, ambfp))
167	>	avstore(&amb);
168	>	nambshare = nambvals;           /* share loaded values */
169	>	if (readonly) {
170	>	sprintf(errmsg,
171	>	"loaded %u values from read-only ambient file",
172	>	nambvals);
173	>	error(WARNING, errmsg);
174	>	fclose(ambfp);          /* close file so no writes */
175	>	ambfp = NULL;
176	>	return;                 /* avoid ambsync() */
177		}
178	+	/* align file pointer */
179	+	lastpos += (long)nambvals*AMBVALSIZ;
180	+	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
181	+	if (flen != lastpos) {
182	+	sprintf(errmsg,
183	+	"ignoring last %ld values in ambient file (corrupted)",
184	+	(flen - lastpos)/AMBVALSIZ);
185	+	error(WARNING, errmsg);
186	+	fseek(ambfp, lastpos, SEEK_SET);
187	+	#ifndef _WIN32 /* XXX we need a replacement for that one */
188	+	ftruncate(fileno(ambfp), (off_t)lastpos);
189	+	#endif
190	+	}
191	+	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
192	+	initambfile(1);                 /* else create new file */
193	+	fflush(ambfp);
194	+	lastpos = ftell(ambfp);
195	+	} else {
196	+	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
197	+	error(SYSTEM, errmsg);
198	+	}
199	+	#ifdef getc_unlocked
200	+	flockfile(ambfp);                       /* application-level lock */
201	+	#endif
202	+	#ifdef  F_SETLKW
203	+	aflock(F_UNLCK);                        /* release file */
204	+	#endif
205		}
206
207
208	<	initambfile(creat)              /* initialize ambient file */
209	<	int  creat;
208	>	void
209	>	ambdone(void)                   /* close ambient file and free memory */
210		{
211	<	extern char  *progname, *octname;
212	<
213	<	setbuf(ambfp, bmalloc(BUFSIZ));
214	<	if (creat) {                    /* new file */
215	<	fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ",
216	<	progname, colval(ambval,RED),
217	<	colval(ambval,GRN), colval(ambval,BLU),
218	<	ambounce, ambacc);
219	<	fprintf(ambfp, "-ad %d -as %d -ar %d %s\n",
220	<	ambdiv, ambssamp, ambres,
221	<	octname==NULL ? "" : octname);
222	<	fputformat(AMBFMT, ambfp);
223	<	putc('\n', ambfp);
224	<	putambmagic(ambfp);
225	<	fflush(ambfp);
226	<	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
227	<	error(USER, "ambient file format error");
228	<	ambheadlen = ftell(ambfp);
211	>	if (ambfp != NULL) {            /* close ambient file */
212	>	ambsync();
213	>	fclose(ambfp);
214	>	ambfp = NULL;
215	>	if (ambinp != NULL) {
216	>	fclose(ambinp);
217	>	ambinp = NULL;
218	>	}
219	>	lastpos = -1;
220	>	}
221	>	/* free ambient tree */
222	>	unloadatree(&atrunk, &avfree);
223	>	/* reset state variables */
224	>	avsum = 0.;
225	>	navsum = 0;
226	>	nambvals = 0;
227	>	nambshare = 0;
228	>	ambclock = 0;
229	>	lastsort = 0;
230	>	sortintvl = SORT_INTVL;
231		}
232
233
234	<	ambnotify(obj)                  /* record new modifier */
235	<	OBJECT  obj;
234	>	void
235	>	ambnotify(                      /* record new modifier */
236	>	OBJECT  obj
237	>	)
238		{
239		static int  hitlimit = 0;
240	<	register OBJREC  *o = objptr(obj);
241	<	register char  **amblp;
240	>	OBJREC   *o;
241	>	char  **amblp;
242
243	+	if (obj == OVOID) {             /* starting over */
244	+	ambset[0] = 0;
245	+	hitlimit = 0;
246	+	return;
247	+	}
248	+	o = objptr(obj);
249		if (hitlimit || !ismodifier(o->otype))
250		return;
251		for (amblp = amblist; *amblp != NULL; amblp++)
#	Line 139 | Line 260 | OBJECT  obj;
260		}
261		}
262
263	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
264
265	<	ambient(acol, r)                /* compute ambient component for ray */
266	<	COLOR  acol;
267	<	register RAY  *r;
265	>	#ifndef OLDAMB
266	>
267	>	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
268	>
269	>	static int      plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang);
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 int      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, caustic;
285	>	int     ok;
286	>	double  d, l;
287
288	+	/* PMAP: Factor in ambient from photon map, if enabled and ray is
289	+	* ambient. Return as all ambient components accounted for, else
290	+	* continue. */
291	+	if (ambPmap(aval, r, rdepth))
292	+	return;
293	+
294	+	/* PMAP: Factor in specular-diffuse ambient (caustics) from photon
295	+	* map, if enabled and ray is primary, else caustic is zero.  Continue
296	+	* with RADIANCE ambient calculation */
297	+	copycolor(caustic, aval);
298	+	ambPmapCaustic(caustic, r, rdepth);
299	+
300		if (ambdiv <= 0)                        /* no ambient calculation */
301		goto dumbamb;
302		/* check number of bounces */
#	Line 158 | Line 308 | register RAY  *r;
308		goto dumbamb;
309
310		if (ambacc <= FTINY) {                  /* no ambient storage */
311	+	copycolor(acol, aval);
312		rdepth++;
313	<	d = doambient(acol, r, r->rweight, NULL, NULL);
313	>	ok = doambient(acol, r, r->rweight,
314	>	NULL, NULL, NULL, NULL, NULL);
315		rdepth--;
316	<	if (d == 0.0)
316	>	if (!ok)
317		goto dumbamb;
318	+	copycolor(aval, acol);
319	+
320	+	/* PMAP: add in caustic */
321	+	addcolor(aval, caustic);
322		return;
323		}
324	<	/* get ambient value */
324	>
325	>	if (tracktime)                          /* sort to minimize thrashing */
326	>	sortambvals(0);
327	>	/* interpolate ambient value */
328		setcolor(acol, 0.0, 0.0, 0.0);
329	<	d = sumambient(acol, r, rdepth,
329	>	d = sumambient(acol, r, nrm, rdepth,
330		&atrunk, thescene.cuorg, thescene.cusize);
331	<	if (d > FTINY)
332	<	scalecolor(acol, 1.0/d);
333	<	else {
334	<	d = makeambient(acol, r, rdepth++);
331	>
332	>	if (d > FTINY) {
333	>	d = 1.0/d;
334	>	scalecolor(acol, d);
335	>	multcolor(aval, acol);
336	>
337	>	/* PMAP: add in caustic */
338	>	addcolor(aval, caustic);
339	>	return;
340	>	}
341	>
342	>	rdepth++;                               /* need to cache new value */
343	>	ok = makeambient(acol, r, nrm, rdepth-1);
344	>	rdepth--;
345	>
346	>	if (ok) {
347	>	multcolor(aval, acol);          /* computed new value */
348	>
349	>	/* PMAP: add in caustic */
350	>	addcolor(aval, caustic);
351	>	return;
352	>	}
353	>
354	>	dumbamb:                                        /* return global value */
355	>	if ((ambvwt <= 0) | (navsum == 0)) {
356	>	multcolor(aval, ambval);
357	>
358	>	/* PMAP: add in caustic */
359	>	addcolor(aval, caustic);
360	>	return;
361	>	}
362	>
363	>	l = bright(ambval);                     /* average in computations */
364	>	if (l > FTINY) {
365	>	d = (log(l)*(double)ambvwt + avsum) /
366	>	(double)(ambvwt + navsum);
367	>	d = exp(d) / l;
368	>	scalecolor(aval, d);
369	>	multcolor(aval, ambval);        /* apply color of ambval */
370	>	} else {
371	>	d = exp( avsum / (double)navsum );
372	>	scalecolor(aval, d);            /* neutral color */
373	>	}
374	>	}
375	>
376	>
377	>	/* Plug a potential leak where ambient cache value is occluded */
378	>	static int
379	>	plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
380	>	{
381	>	const double    cost70sq = 0.1169778;   /* cos(70deg)^2 */
382	>	RAY             rtst;
383	>	FVECT           vdif;
384	>	double          normdot, ndotd, nadotd;
385	>	double          a, b, c, t[2];
386	>
387	>	ang += 2.*PI*(ang < 0);                 /* check direction flags */
388	>	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
389	>	return(0);
390	>	/*
391	>	* Generate test ray, targeting 20 degrees above sample point plane
392	>	* along surface normal from cache position.  This should be high
393	>	* enough to miss local geometry we don't really care about.
394	>	*/
395	>	VSUB(vdif, ap->pos, r->rop);
396	>	normdot = DOT(anorm, r->ron);
397	>	ndotd = DOT(vdif, r->ron);
398	>	nadotd = DOT(vdif, anorm);
399	>	a = normdot*normdot - cost70sq;
400	>	b = 2.0*(normdot*ndotd - nadotd*cost70sq);
401	>	c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq;
402	>	if (quadratic(t, a, b, c) != 2)
403	>	return(1);                      /* should rarely happen */
404	>	if (t[1] <= FTINY)
405	>	return(0);                      /* should fail behind test */
406	>	rayorigin(&rtst, SHADOW, r, NULL);
407	>	VSUM(rtst.rdir, vdif, anorm, t[1]);     /* further dist. > plane */
408	>	rtst.rmax = normalize(rtst.rdir);       /* short ray test */
409	>	while (localhit(&rtst, &thescene)) {    /* check for occluder */
410	>	if (rtst.ro->omod != OVOID &&
411	>	(rtst.clipset == NULL ||
412	>	!inset(rtst.clipset, rtst.ro->omod)))
413	>	return(1);              /* plug light leak */
414	>	VCOPY(rtst.rorg, rtst.rop);     /* skip invisible surface */
415	>	rtst.rmax -= rtst.rot;
416	>	rayclear(&rtst);
417	>	}
418	>	return(0);                              /* seems we're OK */
419	>	}
420	>
421	>
422	>	static double
423	>	sumambient(             /* get interpolated ambient value */
424	>	COLOR  acol,
425	>	RAY  *r,
426	>	FVECT  rn,
427	>	int  al,
428	>	AMBTREE  *at,
429	>	FVECT  c0,
430	>	double  s
431	>	)
432	>	{                       /* initial limit is 10 degrees plus ambacc radians */
433	>	const double    minangle = 10.0 * PI/180.;
434	>	double          maxangle = minangle + ambacc;
435	>	double          wsum = 0.0;
436	>	FVECT           ck0;
437	>	int             i, j;
438	>	AMBVAL          *av;
439	>
440	>	if (at->kid != NULL) {          /* sum children first */
441	>	s *= 0.5;
442	>	for (i = 0; i < 8; i++) {
443	>	for (j = 0; j < 3; j++) {
444	>	ck0[j] = c0[j];
445	>	if (1<<j & i)
446	>	ck0[j] += s;
447	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
448	>	break;
449	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
450	>	break;
451	>	}
452	>	if (j == 3)
453	>	wsum += sumambient(acol, r, rn, al,
454	>	at->kid+i, ck0, s);
455	>	}
456	>	/* good enough? */
457	>	if (wsum >= 0.05 && s > minarad*10.0)
458	>	return(wsum);
459	>	}
460	>	/* adjust maximum angle */
461	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
462	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
463	>	/* sum this node */
464	>	for (av = at->alist; av != NULL; av = av->next) {
465	>	double  u, v, d, delta_r2, delta_t2;
466	>	COLOR   ct;
467	>	FVECT   uvw[3];
468	>	/* record access */
469	>	if (tracktime)
470	>	av->latick = ambclock;
471	>	/*
472	>	*  Ambient level test
473	>	*/
474	>	if (av->lvl > al ||     /* list sorted, so this works */
475	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
476	>	break;
477	>	/*
478	>	*  Direction test using unperturbed normal
479	>	*/
480	>	decodedir(uvw[2], av->ndir);
481	>	d = DOT(uvw[2], r->ron);
482	>	if (d <= 0.0)           /* >= 90 degrees */
483	>	continue;
484	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
485	>	if (delta_r2 >= maxangle*maxangle)
486	>	continue;
487	>	/*
488	>	*  Modified ray behind test
489	>	*/
490	>	VSUB(ck0, r->rop, av->pos);
491	>	d = DOT(ck0, uvw[2]);
492	>	if (d < -minarad*ambacc-.001)
493	>	continue;
494	>	d /= av->rad[0];
495	>	delta_t2 = d*d;
496	>	if (delta_t2 >= ambacc*ambacc)
497	>	continue;
498	>	/*
499	>	*  Elliptical radii test based on Hessian
500	>	*/
501	>	decodedir(uvw[0], av->udir);
502	>	VCROSS(uvw[1], uvw[2], uvw[0]);
503	>	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
504	>	delta_t2 += d*d;
505	>	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
506	>	delta_t2 += d*d;
507	>	if (delta_t2 >= ambacc*ambacc)
508	>	continue;
509	>	/*
510	>	*  Test for potential light leak
511	>	*/
512	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
513	>	continue;
514	>	/*
515	>	*  Extrapolate value and compute final weight (hat function)
516	>	*/
517	>	if (!extambient(ct, av, r->rop, rn, uvw))
518	>	continue;
519	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
520	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
521	>	scalecolor(ct, d);
522	>	addcolor(acol, ct);
523	>	wsum += d;
524	>	}
525	>	return(wsum);
526	>	}
527	>
528	>
529	>	static int
530	>	makeambient(            /* make a new ambient value for storage */
531	>	COLOR  acol,
532	>	RAY  *r,
533	>	FVECT  rn,
534	>	int  al
535	>	)
536	>	{
537	>	AMBVAL  amb;
538	>	FVECT   uvw[3];
539	>	int     i;
540	>
541	>	amb.weight = 1.0;                       /* compute weight */
542	>	for (i = al; i-- > 0; )
543	>	amb.weight *= AVGREFL;
544	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
545	>	amb.weight = 1.25*r->rweight;
546	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
547	>	/* compute ambient */
548	>	i = doambient(acol, r, amb.weight,
549	>	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
550	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
551	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
552	>	return(i);
553	>	/* store value */
554	>	VCOPY(amb.pos, r->rop);
555	>	amb.ndir = encodedir(r->ron);
556	>	amb.udir = encodedir(uvw[0]);
557	>	amb.lvl = al;
558	>	copycolor(amb.val, acol);
559	>	/* insert into tree */
560	>	avsave(&amb);                           /* and save to file */
561	>	if (rn != r->ron) {                     /* texture */
562	>	VCOPY(uvw[2], r->ron);
563	>	extambient(acol, &amb, r->rop, rn, uvw);
564	>	}
565	>	return(1);
566	>	}
567	>
568	>
569	>	static int
570	>	extambient(             /* extrapolate value at pv, nv */
571	>	COLOR  cr,
572	>	AMBVAL   *ap,
573	>	FVECT  pv,
574	>	FVECT  nv,
575	>	FVECT  uvw[3]
576	>	)
577	>	{
578	>	const double    min_d = 0.05;
579	>	static FVECT    my_uvw[3];
580	>	FVECT           v1;
581	>	int             i;
582	>	double          d = 1.0;        /* zeroeth order */
583	>
584	>	if (uvw == NULL) {              /* need local coordinates? */
585	>	decodedir(my_uvw[2], ap->ndir);
586	>	decodedir(my_uvw[0], ap->udir);
587	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
588	>	uvw = my_uvw;
589	>	}
590	>	for (i = 3; i--; )              /* gradient due to translation */
591	>	d += (pv[i] - ap->pos[i]) *
592	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
593	>
594	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
595	>	for (i = 3; i--; )
596	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
597	>
598	>	if (d < min_d)                  /* should not use if we can avoid it */
599	>	d = min_d;
600	>	copycolor(cr, ap->val);
601	>	scalecolor(cr, d);
602	>	return(d > min_d);
603	>	}
604	>
605	>
606	>	static void
607	>	avinsert(                               /* insert ambient value in our tree */
608	>	AMBVAL *av
609	>	)
610	>	{
611	>	AMBTREE  *at;
612	>	AMBVAL  *ap;
613	>	AMBVAL  avh;
614	>	FVECT  ck0;
615	>	double  s;
616	>	int  branch;
617	>	int  i;
618	>
619	>	if (av->rad[0] <= FTINY)
620	>	error(CONSISTENCY, "zero ambient radius in avinsert");
621	>	at = &atrunk;
622	>	VCOPY(ck0, thescene.cuorg);
623	>	s = thescene.cusize;
624	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
625	>	if (at->kid == NULL)
626	>	if ((at->kid = newambtree()) == NULL)
627	>	error(SYSTEM, "out of memory in avinsert");
628	>	s *= 0.5;
629	>	branch = 0;
630	>	for (i = 0; i < 3; i++)
631	>	if (av->pos[i] > ck0[i] + s) {
632	>	ck0[i] += s;
633	>	branch |= 1 << i;
634	>	}
635	>	at = at->kid + branch;
636	>	}
637	>	avh.next = at->alist;           /* order by increasing level */
638	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
639	>	if ( ap->next->lvl > av->lvl ||
640	>	(ap->next->lvl == av->lvl) &
641	>	(ap->next->weight <= av->weight) )
642	>	break;
643	>	av->next = ap->next;
644	>	ap->next = (AMBVAL*)av;
645	>	at->alist = avh.next;
646	>	}
647	>
648	>
649	>	#else /* ! NEWAMB */
650	>
651	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
652	>	AMBTREE *at, FVECT c0, double s);
653	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
654	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
655	>
656	>
657	>	void
658	>	multambient(            /* compute ambient component & multiply by coef. */
659	>	COLOR  aval,
660	>	RAY  *r,
661	>	FVECT  nrm
662	>	)
663	>	{
664	>	static int  rdepth = 0;                 /* ambient recursion */
665	>	COLOR   acol, caustic;
666	>	double  d, l;
667	>
668	>	/* PMAP: Factor in ambient from global photon map (if enabled) and return
669	>	* as all ambient components accounted for */
670	>	if (ambPmap(aval, r, rdepth))
671	>	return;
672	>
673	>	/* PMAP: Otherwise factor in ambient from caustic photon map
674	>	* (ambPmapCaustic() returns zero if caustic photons disabled) and
675	>	* continue with RADIANCE ambient calculation */
676	>	copycolor(caustic, aval);
677	>	ambPmapCaustic(caustic, r, rdepth);
678	>
679	>	if (ambdiv <= 0)                        /* no ambient calculation */
680	>	goto dumbamb;
681	>	/* check number of bounces */
682	>	if (rdepth >= ambounce)
683	>	goto dumbamb;
684	>	/* check ambient list */
685	>	if (ambincl != -1 && r->ro != NULL &&
686	>	ambincl != inset(ambset, r->ro->omod))
687	>	goto dumbamb;
688	>
689	>	if (ambacc <= FTINY) {                  /* no ambient storage */
690	>	copycolor(acol, aval);
691	>	rdepth++;
692	>	d = doambient(acol, r, r->rweight, NULL, NULL);
693		rdepth--;
694	+	if (d <= FTINY)
695	+	goto dumbamb;
696	+	copycolor(aval, acol);
697	+
698	+	/* PMAP: add in caustic */
699	+	addcolor(aval, caustic);
700	+	return;
701		}
702	<	if (d > FTINY)
702	>
703	>	if (tracktime)                          /* sort to minimize thrashing */
704	>	sortambvals(0);
705	>	/* interpolate ambient value */
706	>	setcolor(acol, 0.0, 0.0, 0.0);
707	>	d = sumambient(acol, r, nrm, rdepth,
708	>	&atrunk, thescene.cuorg, thescene.cusize);
709	>
710	>	if (d > FTINY) {
711	>	d = 1.0/d;
712	>	scalecolor(acol, d);
713	>	multcolor(aval, acol);
714	>
715	>	/* PMAP: add in caustic */
716	>	addcolor(aval, caustic);
717		return;
718	+	}
719	+
720	+	rdepth++;                               /* need to cache new value */
721	+	d = makeambient(acol, r, nrm, rdepth-1);
722	+	rdepth--;
723	+
724	+	if (d > FTINY) {
725	+	multcolor(aval, acol);          /* got new value */
726	+
727	+	/* PMAP: add in caustic */
728	+	addcolor(aval, caustic);
729	+	return;
730	+	}
731	+
732		dumbamb:                                        /* return global value */
733	<	copycolor(acol, ambval);
733	>	if ((ambvwt <= 0) | (navsum == 0)) {
734	>	multcolor(aval, ambval);
735	>
736	>	/* PMAP: add in caustic */
737	>	addcolor(aval, caustic);
738	>	return;
739	>	}
740	>
741	>	l = bright(ambval);                     /* average in computations */
742	>	if (l > FTINY) {
743	>	d = (log(l)*(double)ambvwt + avsum) /
744	>	(double)(ambvwt + navsum);
745	>	d = exp(d) / l;
746	>	scalecolor(aval, d);
747	>	multcolor(aval, ambval);        /* apply color of ambval */
748	>	} else {
749	>	d = exp( avsum / (double)navsum );
750	>	scalecolor(aval, d);            /* neutral color */
751	>	}
752		}
753
754
755	<	double
756	<	sumambient(acol, r, al, at, c0, s)      /* get interpolated ambient value */
757	<	COLOR  acol;
758	<	register RAY  *r;
759	<	int  al;
760	<	AMBTREE  *at;
761	<	FVECT  c0;
762	<	double  s;
755	>	static double
756	>	sumambient(     /* get interpolated ambient value */
757	>	COLOR  acol,
758	>	RAY  *r,
759	>	FVECT  rn,
760	>	int  al,
761	>	AMBTREE  *at,
762	>	FVECT  c0,
763	>	double  s
764	>	)
765		{
766	<	extern double  sqrt();
195	<	double  d, e1, e2, wt, wsum;
766	>	double  d, e1, e2, wt, wsum;
767		COLOR  ct;
768		FVECT  ck0;
769		int  i;
770	<	register int  j;
771	<	register AMBVAL  *av;
772	<	/* do this node */
770	>	int  j;
771	>	AMBVAL   *av;
772	>
773		wsum = 0.0;
774	+	/* do this node */
775		for (av = at->alist; av != NULL; av = av->next) {
776	+	double  rn_dot = -2.0;
777	+	if (tracktime)
778	+	av->latick = ambclock;
779		/*
780		*  Ambient level test.
781		*/
782	<	if (av->lvl > al || av->weight < r->rweight-FTINY)
783	<	continue;
782	>	if (av->lvl > al ||     /* list sorted, so this works */
783	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
784	>	break;
785		/*
786		*  Ambient radius test.
787		*/
788	<	e1 = 0.0;
789	<	for (j = 0; j < 3; j++) {
214	<	d = av->pos[j] - r->rop[j];
215	<	e1 += d * d;
216	<	}
217	<	e1 /= av->rad * av->rad;
788	>	VSUB(ck0, av->pos, r->rop);
789	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
790		if (e1 > ambacc*ambacc*1.21)
791		continue;
792		/*
793	<	*  Normal direction test.
793	>	*  Direction test using closest normal.
794		*/
795	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
796	<	if (e2 < 0.0) e2 = 0.0;
797	<	if (e1 + e2 > ambacc*ambacc*1.21)
795	>	d = DOT(av->dir, r->ron);
796	>	if (rn != r->ron) {
797	>	rn_dot = DOT(av->dir, rn);
798	>	if (rn_dot > 1.0-FTINY)
799	>	rn_dot = 1.0-FTINY;
800	>	if (rn_dot >= d-FTINY) {
801	>	d = rn_dot;
802	>	rn_dot = -2.0;
803	>	}
804	>	}
805	>	e2 = (1.0 - d) * r->rweight;
806	>	if (e2 < 0.0)
807	>	e2 = 0.0;
808	>	else if (e1 + e2 > ambacc*ambacc*1.21)
809		continue;
810		/*
811		*  Ray behind test.
#	Line 236 | Line 819 | double  s;
819		/*
820		*  Jittering final test reduces image artifacts.
821		*/
822	<	wt = sqrt(e1) + sqrt(e2);
823	<	wt *= .9 + .2*urand(9015+samplendx);
824	<	if (wt > ambacc)
822	>	e1 = sqrt(e1);
823	>	e2 = sqrt(e2);
824	>	wt = e1 + e2;
825	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
826		continue;
827	+	/*
828	+	*  Recompute directional error using perturbed normal
829	+	*/
830	+	if (rn_dot > 0.0) {
831	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
832	+	wt = e1 + e2;
833	+	}
834		if (wt <= 1e-3)
835		wt = 1e3;
836		else
837		wt = 1.0 / wt;
838		wsum += wt;
839	<	extambient(ct, av, r->rop, r->ron);
839	>	extambient(ct, av, r->rop, rn);
840		scalecolor(ct, wt);
841		addcolor(acol, ct);
842		}
#	Line 264 | Line 855 | double  s;
855		break;
856		}
857		if (j == 3)
858	<	wsum += sumambient(acol, r, al, at->kid+i, ck0, s);
858	>	wsum += sumambient(acol, r, rn, al,
859	>	at->kid+i, ck0, s);
860		}
861		return(wsum);
862		}
863
864
865	<	double
866	<	makeambient(acol, r, al)        /* make a new ambient value */
867	<	COLOR  acol;
868	<	register RAY  *r;
869	<	int  al;
865	>	static double
866	>	makeambient(            /* make a new ambient value for storage */
867	>	COLOR  acol,
868	>	RAY  *r,
869	>	FVECT  rn,
870	>	int  al
871	>	)
872		{
873	<	AMBVAL  amb;
873	>	AMBVAL  amb;
874		FVECT   gp, gd;
875	<	/* compute weight */
876	<	amb.weight = pow(AVGREFL, (double)al);
877	<	if (r->rweight < 0.2*amb.weight)        /* heuristic */
878	<	amb.weight = r->rweight;
875	>	int     i;
876	>
877	>	amb.weight = 1.0;                       /* compute weight */
878	>	for (i = al; i-- > 0; )
879	>	amb.weight *= AVGREFL;
880	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
881	>	amb.weight = 1.25*r->rweight;
882	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
883		/* compute ambient */
884		amb.rad = doambient(acol, r, amb.weight, gp, gd);
885	<	if (amb.rad == 0.0)
885	>	if (amb.rad <= FTINY) {
886	>	setcolor(acol, 0.0, 0.0, 0.0);
887		return(0.0);
888	<	/* store it */
888	>	}
889	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
890	>	/* store value */
891		VCOPY(amb.pos, r->rop);
892		VCOPY(amb.dir, r->ron);
893		amb.lvl = al;
#	Line 294 | Line 895 | int  al;
895		VCOPY(amb.gpos, gp);
896		VCOPY(amb.gdir, gd);
897		/* insert into tree */
898	<	avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize);
899	<	avsave(&amb);                           /* write to file */
898	>	avsave(&amb);                           /* and save to file */
899	>	if (rn != r->ron)
900	>	extambient(acol, &amb, r->rop, rn);     /* texture */
901		return(amb.rad);
902		}
903
904
905	<	extambient(cr, ap, pv, nv)              /* extrapolate value at pv, nv */
906	<	COLOR  cr;
907	<	register AMBVAL  *ap;
908	<	FVECT  pv, nv;
905	>	static void
906	>	extambient(             /* extrapolate value at pv, nv */
907	>	COLOR  cr,
908	>	AMBVAL   *ap,
909	>	FVECT  pv,
910	>	FVECT  nv
911	>	)
912		{
913	<	FVECT  v1, v2;
914	<	register int  i;
915	<	double  d;
913	>	FVECT  v1;
914	>	int  i;
915	>	double  d;
916
917		d = 1.0;                        /* zeroeth order */
918		/* gradient due to translation */
919		for (i = 0; i < 3; i++)
920		d += ap->gpos[i]*(pv[i]-ap->pos[i]);
921		/* gradient due to rotation */
922	<	VCOPY(v1, ap->dir);
923	<	fcross(v2, v1, nv);
319	<	d += DOT(ap->gdir, v2);
922	>	VCROSS(v1, ap->dir, nv);
923	>	d += DOT(ap->gdir, v1);
924		if (d <= 0.0) {
925		setcolor(cr, 0.0, 0.0, 0.0);
926		return;
#	Line 326 | Line 930 | FVECT  pv, nv;
930		}
931
932
933	<	static
934	<	avsave(av)                              /* save an ambient value */
935	<	AMBVAL  *av;
933	>	static void
934	>	avinsert(                               /* insert ambient value in our tree */
935	>	AMBVAL *av
936	>	)
937		{
938	<	static int  nunflshed = 0;
939	<
940	<	if (ambfp == NULL)
336	<	return;
337	<	if (writambval(av, ambfp) < 0)
338	<	goto writerr;
339	<	if (++nunflshed >= AMBFLUSH) {
340	<	if (fflush(ambfp) == EOF)
341	<	goto writerr;
342	<	nunflshed = 0;
343	<	}
344	<	return;
345	<	writerr:
346	<	error(SYSTEM, "error writing ambient file");
347	<	}
348	<
349	<
350	<	static
351	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
352	<	AMBVAL  *aval;
353	<	register AMBTREE  *at;
354	<	FVECT  c0;
355	<	double  s;
356	<	{
938	>	AMBTREE  *at;
939	>	AMBVAL  *ap;
940	>	AMBVAL  avh;
941		FVECT  ck0;
942	+	double  s;
943		int  branch;
944	<	register AMBVAL  *av;
360	<	register int  i;
944	>	int  i;
945
946	<	if ((av = newambval()) == NULL)
947	<	goto memerr;
948	<	copystruct(av, aval);
949	<	VCOPY(ck0, c0);
946	>	if (av->rad <= FTINY)
947	>	error(CONSISTENCY, "zero ambient radius in avinsert");
948	>	at = &atrunk;
949	>	VCOPY(ck0, thescene.cuorg);
950	>	s = thescene.cusize;
951		while (s*(OCTSCALE/2) > av->rad*ambacc) {
952		if (at->kid == NULL)
953		if ((at->kid = newambtree()) == NULL)
954	<	goto memerr;
954	>	error(SYSTEM, "out of memory in avinsert");
955		s *= 0.5;
956		branch = 0;
957		for (i = 0; i < 3; i++)
#	Line 376 | Line 961 | double  s;
961		}
962		at = at->kid + branch;
963		}
964	<	av->next = at->alist;
965	<	at->alist = av;
964	>	avh.next = at->alist;           /* order by increasing level */
965	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
966	>	if ( ap->next->lvl > av->lvl ||
967	>	(ap->next->lvl == av->lvl) &
968	>	(ap->next->weight <= av->weight) )
969	>	break;
970	>	av->next = ap->next;
971	>	ap->next = (AMBVAL*)av;
972	>	at->alist = avh.next;
973	>	}
974	>
975	>	#endif  /* ! NEWAMB */
976	>
977	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
978	>
979	>	static void
980	>	initambfile(            /* initialize ambient file */
981	>	int  cre8
982	>	)
983	>	{
984	>	extern char  *progname, *octname;
985	>	static char  *mybuf = NULL;
986	>
987	>	#ifdef  F_SETLKW
988	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
989	>	#endif
990	>	SET_FILE_BINARY(ambfp);
991	>	if (mybuf == NULL)
992	>	mybuf = (char *)bmalloc(BUFSIZ+8);
993	>	setbuf(ambfp, mybuf);
994	>	if (cre8) {                     /* new file */
995	>	newheader("RADIANCE", ambfp);
996	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
997	>	progname, colval(ambval,RED),
998	>	colval(ambval,GRN), colval(ambval,BLU),
999	>	ambvwt, ambounce, ambacc);
1000	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
1001	>	ambdiv, ambssamp, ambres);
1002	>	if (octname != NULL)
1003	>	fputs(octname, ambfp);
1004	>	fputc('\n', ambfp);
1005	>	fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1006	>	fputnow(ambfp);
1007	>	fputformat(AMBFMT, ambfp);
1008	>	fputc('\n', ambfp);
1009	>	putambmagic(ambfp);
1010	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
1011	>	error(USER, "bad ambient file");
1012	>	}
1013	>
1014	>
1015	>	static void
1016	>	avsave(                         /* insert and save an ambient value */
1017	>	AMBVAL  *av
1018	>	)
1019	>	{
1020	>	avstore(av);
1021	>	if (ambfp == NULL)
1022	>	return;
1023	>	if (writambval(av, ambfp) < 0)
1024	>	goto writerr;
1025	>	if (++nunflshed >= AMBFLUSH)
1026	>	if (ambsync() == EOF)
1027	>	goto writerr;
1028		return;
1029	<	memerr:
1030	<	error(SYSTEM, "out of memory in avinsert");
1029	>	writerr:
1030	>	error(SYSTEM, "error writing to ambient file");
1031		}
1032	+
1033	+
1034	+	static AMBVAL *
1035	+	avstore(                                /* allocate memory and save aval */
1036	+	AMBVAL  *aval
1037	+	)
1038	+	{
1039	+	AMBVAL  *av;
1040	+	double  d;
1041	+
1042	+	if ((av = newambval()) == NULL)
1043	+	error(SYSTEM, "out of memory in avstore");
1044	+	*av = *aval;
1045	+	av->latick = ambclock;
1046	+	av->next = NULL;
1047	+	nambvals++;
1048	+	d = bright(av->val);
1049	+	if (d > FTINY) {                /* add to log sum for averaging */
1050	+	avsum += log(d);
1051	+	navsum++;
1052	+	}
1053	+	avinsert(av);                   /* insert in our cache tree */
1054	+	return(av);
1055	+	}
1056	+
1057	+
1058	+	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
1059	+
1060	+	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
1061	+
1062	+
1063	+	static AMBTREE *
1064	+	newambtree(void)                                /* allocate 8 ambient tree structs */
1065	+	{
1066	+	AMBTREE  *atp, *upperlim;
1067	+
1068	+	if (atfreelist == NULL) {       /* get more nodes */
1069	+	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
1070	+	if (atfreelist == NULL)
1071	+	return(NULL);
1072	+	/* link new free list */
1073	+	upperlim = atfreelist + 8*(ATALLOCSZ-1);
1074	+	for (atp = atfreelist; atp < upperlim; atp += 8)
1075	+	atp->kid = atp + 8;
1076	+	atp->kid = NULL;
1077	+	}
1078	+	atp = atfreelist;
1079	+	atfreelist = atp->kid;
1080	+	memset((char *)atp, '\0', 8*sizeof(AMBTREE));
1081	+	return(atp);
1082	+	}
1083	+
1084	+
1085	+	static void
1086	+	freeambtree(                    /* free 8 ambient tree structs */
1087	+	AMBTREE  *atp
1088	+	)
1089	+	{
1090	+	atp->kid = atfreelist;
1091	+	atfreelist = atp;
1092	+	}
1093	+
1094	+
1095	+	static void
1096	+	unloadatree(                    /* unload an ambient value tree */
1097	+	AMBTREE  *at,
1098	+	unloadtf_t *f
1099	+	)
1100	+	{
1101	+	AMBVAL  *av;
1102	+	int  i;
1103	+	/* transfer values at this node */
1104	+	for (av = at->alist; av != NULL; av = at->alist) {
1105	+	at->alist = av->next;
1106	+	(*f)(av);
1107	+	}
1108	+	if (at->kid == NULL)
1109	+	return;
1110	+	for (i = 0; i < 8; i++)         /* transfer and free children */
1111	+	unloadatree(at->kid+i, f);
1112	+	freeambtree(at->kid);
1113	+	at->kid = NULL;
1114	+	}
1115	+
1116	+
1117	+	static struct avl {
1118	+	AMBVAL  *p;
1119	+	unsigned long   t;
1120	+	}       *avlist1;                       /* ambient value list with ticks */
1121	+	static AMBVAL   **avlist2;              /* memory positions for sorting */
1122	+	static int      i_avlist;               /* index for lists */
1123	+
1124	+	static int alatcmp(const void *av1, const void *av2);
1125	+
1126	+	static void
1127	+	avfree(AMBVAL *av)
1128	+	{
1129	+	free(av);
1130	+	}
1131	+
1132	+	static void
1133	+	av2list(
1134	+	AMBVAL *av
1135	+	)
1136	+	{
1137	+	#ifdef DEBUG
1138	+	if (i_avlist >= nambvals)
1139	+	error(CONSISTENCY, "too many ambient values in av2list1");
1140	+	#endif
1141	+	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1142	+	avlist1[i_avlist++].t = av->latick;
1143	+	}
1144	+
1145	+
1146	+	static int
1147	+	alatcmp(                        /* compare ambient values for MRA */
1148	+	const void *av1,
1149	+	const void *av2
1150	+	)
1151	+	{
1152	+	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1153	+	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1154	+	}
1155	+
1156	+
1157	+	/* GW NOTE 2002/10/3:
1158	+	* I used to compare AMBVAL pointers, but found that this was the
1159	+	* cause of a serious consistency error with gcc, since the optimizer
1160	+	* uses some dangerous trick in pointer subtraction that
1161	+	* assumes pointers differ by exact struct size increments.
1162	+	*/
1163	+	static int
1164	+	aposcmp(                        /* compare ambient value positions */
1165	+	const void      *avp1,
1166	+	const void      *avp2
1167	+	)
1168	+	{
1169	+	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1170	+	if (diff < 0)
1171	+	return(-1);
1172	+	return(diff > 0);
1173	+	}
1174	+
1175	+
1176	+	static int
1177	+	avlmemi(                                /* find list position from address */
1178	+	AMBVAL  *avaddr
1179	+	)
1180	+	{
1181	+	AMBVAL  **avlpp;
1182	+
1183	+	avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2,
1184	+	nambvals, sizeof(AMBVAL *), &aposcmp);
1185	+	if (avlpp == NULL)
1186	+	error(CONSISTENCY, "address not found in avlmemi");
1187	+	return(avlpp - avlist2);
1188	+	}
1189	+
1190	+
1191	+	static void
1192	+	sortambvals(                    /* resort ambient values */
1193	+	int     always
1194	+	)
1195	+	{
1196	+	AMBTREE  oldatrunk;
1197	+	AMBVAL  tav, *tap, *pnext;
1198	+	int     i, j;
1199	+	/* see if it's time yet */
1200	+	if (!always && (ambclock++ < lastsort+sortintvl ||
1201	+	nambvals < SORT_THRESH))
1202	+	return;
1203	+	/*
1204	+	* The idea here is to minimize memory thrashing
1205	+	* in VM systems by improving reference locality.
1206	+	* We do this by periodically sorting our stored ambient
1207	+	* values in memory in order of most recently to least
1208	+	* recently accessed.  This ordering was chosen so that new
1209	+	* ambient values (which tend to be less important) go into
1210	+	* higher memory with the infrequently accessed values.
1211	+	*      Since we expect our values to need sorting less
1212	+	* frequently as the process continues, we double our
1213	+	* waiting interval after each call.
1214	+	*      This routine is also called by setambacc() with
1215	+	* the "always" parameter set to 1 so that the ambient
1216	+	* tree will be rebuilt with the new accuracy parameter.
1217	+	*/
1218	+	if (tracktime) {                /* allocate pointer arrays to sort */
1219	+	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1220	+	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1221	+	} else {
1222	+	avlist2 = NULL;
1223	+	avlist1 = NULL;
1224	+	}
1225	+	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1226	+	if (avlist2 != NULL)
1227	+	free((void *)avlist2);
1228	+	if (always) {           /* rebuild without sorting */
1229	+	oldatrunk = atrunk;
1230	+	atrunk.alist = NULL;
1231	+	atrunk.kid = NULL;
1232	+	unloadatree(&oldatrunk, &avinsert);
1233	+	}
1234	+	} else {                        /* sort memory by last access time */
1235	+	/*
1236	+	* Sorting memory is tricky because it isn't contiguous.
1237	+	* We have to sort an array of pointers by MRA and also
1238	+	* by memory position.  We then copy values in "loops"
1239	+	* to minimize memory hits.  Nevertheless, we will visit
1240	+	* everyone at least twice, and this is an expensive process
1241	+	* when we're thrashing, which is when we need to do it.
1242	+	*/
1243	+	#ifdef DEBUG
1244	+	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1245	+	nambvals, ambclock);
1246	+	eputs(errmsg);
1247	+	#endif
1248	+	i_avlist = 0;
1249	+	unloadatree(&atrunk, &av2list); /* empty current tree */
1250	+	#ifdef DEBUG
1251	+	if (i_avlist < nambvals)
1252	+	error(CONSISTENCY, "missing ambient values in sortambvals");
1253	+	#endif
1254	+	qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp);
1255	+	qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1256	+	for (i = 0; i < nambvals; i++) {
1257	+	if (avlist1[i].p == NULL)
1258	+	continue;
1259	+	tap = avlist2[i];
1260	+	tav = *tap;
1261	+	for (j = i; (pnext = avlist1[j].p) != tap;
1262	+	j = avlmemi(pnext)) {
1263	+	*(avlist2[j]) = *pnext;
1264	+	avinsert(avlist2[j]);
1265	+	avlist1[j].p = NULL;
1266	+	}
1267	+	*(avlist2[j]) = tav;
1268	+	avinsert(avlist2[j]);
1269	+	avlist1[j].p = NULL;
1270	+	}
1271	+	free((void *)avlist1);
1272	+	free((void *)avlist2);
1273	+	/* compute new sort interval */
1274	+	sortintvl = ambclock - lastsort;
1275	+	if (sortintvl >= MAX_SORT_INTVL/2)
1276	+	sortintvl = MAX_SORT_INTVL;
1277	+	else
1278	+	sortintvl <<= 1;        /* wait twice as long next */
1279	+	#ifdef DEBUG
1280	+	eputs("done\n");
1281	+	#endif
1282	+	}
1283	+	if (ambclock >= MAXACLOCK)
1284	+	ambclock = MAXACLOCK/2;
1285	+	lastsort = ambclock;
1286	+	}
1287	+
1288	+
1289	+	#ifdef  F_SETLKW
1290	+
1291	+	static void
1292	+	aflock(                 /* lock/unlock ambient file */
1293	+	int  typ
1294	+	)
1295	+	{
1296	+	static struct flock  fls;       /* static so initialized to zeroes */
1297	+
1298	+	if (typ == fls.l_type)          /* already called? */
1299	+	return;
1300	+	fls.l_type = typ;
1301	+	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1302	+	error(SYSTEM, "cannot (un)lock ambient file");
1303	+	}
1304	+
1305	+
1306	+	int
1307	+	ambsync(void)                   /* synchronize ambient file */
1308	+	{
1309	+	long  flen;
1310	+	AMBVAL  avs;
1311	+	int  n;
1312	+
1313	+	if (ambfp == NULL)      /* no ambient file? */
1314	+	return(0);
1315	+	/* gain appropriate access */
1316	+	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1317	+	/* see if file has grown */
1318	+	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1319	+	goto seekerr;
1320	+	if ((n = flen - lastpos) > 0) {         /* file has grown */
1321	+	if (ambinp == NULL) {           /* use duplicate filedes */
1322	+	ambinp = fdopen(dup(fileno(ambfp)), "r");
1323	+	if (ambinp == NULL)
1324	+	error(SYSTEM, "fdopen failed in ambsync");
1325	+	}
1326	+	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1327	+	goto seekerr;
1328	+	while (n >= AMBVALSIZ) {        /* load contributed values */
1329	+	if (!readambval(&avs, ambinp)) {
1330	+	sprintf(errmsg,
1331	+	"ambient file \"%s\" corrupted near character %ld",
1332	+	ambfile, flen - n);
1333	+	error(WARNING, errmsg);
1334	+	break;
1335	+	}
1336	+	avstore(&avs);
1337	+	n -= AMBVALSIZ;
1338	+	}
1339	+	lastpos = flen - n;
1340	+	/*** seek always as safety measure
1341	+	if (n) ***/                     /* alignment */
1342	+	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1343	+	goto seekerr;
1344	+	}
1345	+	n = fflush(ambfp);                      /* calls write() at last */
1346	+	if (n != EOF)
1347	+	lastpos += (long)nunflshed*AMBVALSIZ;
1348	+	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1349	+	goto seekerr;
1350	+
1351	+	aflock(F_UNLCK);                        /* release file */
1352	+	nunflshed = 0;
1353	+	return(n);
1354	+	seekerr:
1355	+	error(SYSTEM, "seek failed in ambsync");
1356	+	return -1; /* pro forma return */
1357	+	}
1358	+
1359	+	#else   /* ! F_SETLKW */
1360	+
1361	+	int
1362	+	ambsync(void)                   /* flush ambient file */
1363	+	{
1364	+	if (ambfp == NULL)
1365	+	return(0);
1366	+	nunflshed = 0;
1367	+	return(fflush(ambfp));
1368	+	}
1369	+
1370	+	#endif  /* ! F_SETLKW */

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