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

Comparing ray/src/rt/ambient.c (file contents):
Revision 1.14 by greg, Fri Jun 7 10:04:29 1991 UTC vs.
Revision 2.92 by greg, Fri Nov 21 00:30:11 2014 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1991 Regents of the University of California */
2	–
1		#ifndef lint
2	<	static char SCCSid[] = "$SunId$ LBL";
2	>	static const char       RCSid[] = "$Id$";
3		#endif
6	–
4		/*
5		*  ambient.c - routines dealing with ambient (inter-reflected) component.
6		*
7	<	*  The macro AMBFLUSH (if defined) is the number of ambient values
11	<	*      to wait before flushing to the ambient file.
12	<	*
13	<	*     5/9/86
7	>	*  Declarations of external symbols in ambient.h
8		*/
9
10	<	#include  "ray.h"
10	>	#include "copyright.h"
11
12	<	#include  "octree.h"
12	>	#include <string.h>
13
14	+	#include  "platform.h"
15	+	#include  "ray.h"
16		#include  "otypes.h"
17	<
17	>	#include  "resolu.h"
18		#include  "ambient.h"
23	–
19		#include  "random.h"
20
21	<	#define  OCTSCALE       0.5     /* ceil((valid rad.)/(cube size)) */
21	>	#ifndef  OCTSCALE
22	>	#define  OCTSCALE       1.0     /* ceil((valid rad.)/(cube size)) */
23	>	#endif
24
25	<	typedef struct ambtree {
29	<	AMBVAL  *alist;         /* ambient value list */
30	<	struct ambtree  *kid;   /* 8 child nodes */
31	<	}  AMBTREE;                     /* ambient octree */
25	>	extern char  *shm_boundary;     /* memory sharing boundary */
26
27	<	extern CUBE  thescene;          /* contains space boundaries */
27	>	#ifndef  MAXASET
28	>	#define  MAXASET        4095    /* maximum number of elements in ambient set */
29	>	#endif
30	>	OBJECT  ambset[MAXASET+1]={0};  /* ambient include/exclude set */
31
32	<	#define  MAXASET        511     /* maximum number of elements in ambient set */
33	<	OBJECT  ambset[MAXASET+1]={0};  /* ambient include/exclude set */
32	>	double  maxarad;                /* maximum ambient radius */
33	>	double  minarad;                /* minimum ambient radius */
34
35	<	double  maxarad;                /* maximum ambient radius */
39	<	double  minarad;                /* minimum ambient radius */
35	>	static AMBTREE  atrunk;         /* our ambient trunk node */
36
41	–	static AMBTREE  atrunk;         /* our ambient trunk node */
42	–
37		static FILE  *ambfp = NULL;     /* ambient file pointer */
38	+	static int  nunflshed = 0;      /* number of unflushed ambient values */
39
40	<	#define  newambval()    (AMBVAL *)bmalloc(sizeof(AMBVAL))
40	>	#ifndef SORT_THRESH
41	>	#ifdef SMLMEM
42	>	#define SORT_THRESH     ((16L<<20)/sizeof(AMBVAL))
43	>	#else
44	>	#define SORT_THRESH     ((64L<<20)/sizeof(AMBVAL))
45	>	#endif
46	>	#endif
47	>	#ifndef SORT_INTVL
48	>	#define SORT_INTVL      (SORT_THRESH<<1)
49	>	#endif
50	>	#ifndef MAX_SORT_INTVL
51	>	#define MAX_SORT_INTVL  (SORT_INTVL<<6)
52	>	#endif
53
47	–	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
54
55	+	static double  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	<	setambient(afile)                       /* initialize calculation */
66	<	char  *afile;
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 *)malloc(sizeof(AMBVAL))
80	>	#define  freeav(av)     free((void *)av);
81	>
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	>	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	>	#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	<	long  ftell();
109	<	AMBVAL  amb;
108	>	ambres = ar < 0 ? 0 : ar;               /* may be done already */
109	>	/* set min & max radii */
110	>	if (ar <= 0) {
111	>	minarad = 0;
112	>	maxarad = thescene.cusize*0.2;
113	>	} else {
114	>	minarad = thescene.cusize / ar;
115	>	maxarad = 64.0 * minarad;               /* heuristic */
116	>	if (maxarad > thescene.cusize*0.2)
117	>	maxarad = thescene.cusize*0.2;
118	>	}
119	>	if (minarad <= FTINY)
120	>	minarad = 10.0*FTINY;
121	>	if (maxarad <= minarad)
122	>	maxarad = 64.0 * minarad;
123	>	}
124
56	–	maxarad = thescene.cusize / 2.0;                /* maximum radius */
57	–	/* minimum radius */
58	–	minarad = ambres > 0 ? thescene.cusize/ambres : 0.0;
125
126	<	/* open ambient file */
127	<	if (afile != NULL)
128	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
129	<	while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1)
130	<	avinsert(&amb, &atrunk, thescene.cuorg,
131	<	thescene.cusize);
132	<	/* align */
133	<	fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1);
134	<	} else if ((ambfp = fopen(afile, "w")) == NULL) {
135	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
136	<	afile);
137	<	error(SYSTEM, errmsg);
126	>	void
127	>	setambacc(                              /* set ambient accuracy */
128	>	double  newa
129	>	)
130	>	{
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 ((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	>	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 94 | 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	>	#ifndef OLDAMB
267	>
268	>	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
269	>
270	>	static int      plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang);
271	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
272	>	AMBTREE *at, FVECT c0, double s);
273	>	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
274	>	static int      extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
275	>	FVECT uvw[3]);
276	>
277	>	void
278	>	multambient(            /* compute ambient component & multiply by coef. */
279	>	COLOR  aval,
280	>	RAY  *r,
281	>	FVECT  nrm
282	>	)
283		{
284		static int  rdepth = 0;                 /* ambient recursion */
285	<	double  wsum;
285	>	COLOR   acol;
286	>	int     ok;
287	>	double  d, l;
288
105	–	rdepth++;                               /* increment level */
106	–
289		if (ambdiv <= 0)                        /* no ambient calculation */
290		goto dumbamb;
291		/* check number of bounces */
292	<	if (rdepth > ambounce)
292	>	if (rdepth >= ambounce)
293		goto dumbamb;
294		/* check ambient list */
295		if (ambincl != -1 && r->ro != NULL &&
#	Line 115 | Line 297 | register RAY  *r;
297		goto dumbamb;
298
299		if (ambacc <= FTINY) {                  /* no ambient storage */
300	<	if (doambient(acol, r, NULL, NULL) == 0.0)
300	>	copycolor(acol, aval);
301	>	rdepth++;
302	>	ok = doambient(acol, r, r->rweight,
303	>	NULL, NULL, NULL, NULL, NULL);
304	>	rdepth--;
305	>	if (!ok)
306		goto dumbamb;
307	<	goto done;
307	>	copycolor(aval, acol);
308	>	return;
309		}
310	<	/* get ambient value */
310	>
311	>	if (tracktime)                          /* sort to minimize thrashing */
312	>	sortambvals(0);
313	>	/* interpolate ambient value */
314		setcolor(acol, 0.0, 0.0, 0.0);
315	<	wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize);
316	<	if (wsum > FTINY)
317	<	scalecolor(acol, 1.0/wsum);
318	<	else if (makeambient(acol, r) == 0.0)
315	>	d = sumambient(acol, r, nrm, rdepth,
316	>	&atrunk, thescene.cuorg, thescene.cusize);
317	>	if (d > FTINY) {
318	>	d = 1.0/d;
319	>	scalecolor(acol, d);
320	>	multcolor(aval, acol);
321	>	return;
322	>	}
323	>	rdepth++;                               /* need to cache new value */
324	>	ok = makeambient(acol, r, nrm, rdepth-1);
325	>	rdepth--;
326	>	if (ok) {
327	>	multcolor(aval, acol);          /* computed new value */
328	>	return;
329	>	}
330	>	dumbamb:                                        /* return global value */
331	>	if ((ambvwt <= 0) | (navsum == 0)) {
332	>	multcolor(aval, ambval);
333	>	return;
334	>	}
335	>	l = bright(ambval);                     /* average in computations */
336	>	if (l > FTINY) {
337	>	d = (log(l)*(double)ambvwt + avsum) /
338	>	(double)(ambvwt + navsum);
339	>	d = exp(d) / l;
340	>	scalecolor(aval, d);
341	>	multcolor(aval, ambval);        /* apply color of ambval */
342	>	} else {
343	>	d = exp( avsum / (double)navsum );
344	>	scalecolor(aval, d);            /* neutral color */
345	>	}
346	>	}
347	>
348	>
349	>	/* Plug a potential leak where ambient cache value is occluded */
350	>	static int
351	>	plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
352	>	{
353	>	const double    cost70sq = 0.1169778;   /* cos(70deg)^2 */
354	>	RAY             rtst;
355	>	FVECT           vdif;
356	>	double          normdot, ndotd, nadotd;
357	>	double          a, b, c, t[2];
358	>
359	>	ang += 2.*PI*(ang < 0);                 /* check direction flags */
360	>	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
361	>	return(0);
362	>	/*
363	>	* Generate test ray, targeting 20 degrees above sample point plane
364	>	* along surface normal from cache position.  This should be high
365	>	* enough to miss local geometry we don't really care about.
366	>	*/
367	>	VSUB(vdif, ap->pos, r->rop);
368	>	normdot = DOT(anorm, r->ron);
369	>	ndotd = DOT(vdif, r->ron);
370	>	nadotd = DOT(vdif, anorm);
371	>	a = normdot*normdot - cost70sq;
372	>	b = 2.0*(normdot*ndotd - nadotd*cost70sq);
373	>	c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq;
374	>	if (quadratic(t, a, b, c) != 2)
375	>	return(1);                      /* should rarely happen */
376	>	if (t[1] <= FTINY)
377	>	return(0);                      /* should fail behind test */
378	>	rayorigin(&rtst, SHADOW, r, NULL);
379	>	VSUM(rtst.rdir, vdif, anorm, t[1]);     /* further dist. > plane */
380	>	rtst.rmax = normalize(rtst.rdir);       /* short ray test */
381	>	while (localhit(&rtst, &thescene)) {    /* check for occluder */
382	>	if (rtst.ro->omod != OVOID &&
383	>	(rtst.clipset == NULL ||
384	>	!inset(rtst.clipset, rtst.ro->omod)))
385	>	return(1);              /* plug light leak */
386	>	VCOPY(rtst.rorg, rtst.rop);     /* skip invisible surface */
387	>	rtst.rmax -= rtst.rot;
388	>	rayclear(&rtst);
389	>	}
390	>	return(0);                              /* seems we're OK */
391	>	}
392	>
393	>
394	>	static double
395	>	sumambient(             /* get interpolated ambient value */
396	>	COLOR  acol,
397	>	RAY  *r,
398	>	FVECT  rn,
399	>	int  al,
400	>	AMBTREE  *at,
401	>	FVECT  c0,
402	>	double  s
403	>	)
404	>	{                       /* initial limit is 10 degrees plus ambacc radians */
405	>	const double    minangle = 10.0 * PI/180.;
406	>	double          maxangle = minangle + ambacc;
407	>	double          wsum = 0.0;
408	>	FVECT           ck0;
409	>	int             i, j;
410	>	AMBVAL          *av;
411	>
412	>	if (at->kid != NULL) {          /* sum children first */
413	>	s *= 0.5;
414	>	for (i = 0; i < 8; i++) {
415	>	for (j = 0; j < 3; j++) {
416	>	ck0[j] = c0[j];
417	>	if (1<<j & i)
418	>	ck0[j] += s;
419	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
420	>	break;
421	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
422	>	break;
423	>	}
424	>	if (j == 3)
425	>	wsum += sumambient(acol, r, rn, al,
426	>	at->kid+i, ck0, s);
427	>	}
428	>	/* good enough? */
429	>	if (wsum >= 0.05 && s > minarad*10.0)
430	>	return(wsum);
431	>	}
432	>	/* adjust maximum angle */
433	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
434	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
435	>	/* sum this node */
436	>	for (av = at->alist; av != NULL; av = av->next) {
437	>	double  u, v, d, delta_r2, delta_t2;
438	>	COLOR   ct;
439	>	FVECT   uvw[3];
440	>	/* record access */
441	>	if (tracktime)
442	>	av->latick = ambclock;
443	>	/*
444	>	*  Ambient level test
445	>	*/
446	>	if (av->lvl > al ||     /* list sorted, so this works */
447	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
448	>	break;
449	>	/*
450	>	*  Direction test using unperturbed normal
451	>	*/
452	>	decodedir(uvw[2], av->ndir);
453	>	d = DOT(uvw[2], r->ron);
454	>	if (d <= 0.0)           /* >= 90 degrees */
455	>	continue;
456	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
457	>	if (delta_r2 >= maxangle*maxangle)
458	>	continue;
459	>	/*
460	>	*  Modified ray behind test
461	>	*/
462	>	VSUB(ck0, r->rop, av->pos);
463	>	d = DOT(ck0, uvw[2]);
464	>	if (d < -minarad*ambacc-.001)
465	>	continue;
466	>	d /= av->rad[0];
467	>	delta_t2 = d*d;
468	>	if (delta_t2 >= ambacc*ambacc)
469	>	continue;
470	>	/*
471	>	*  Elliptical radii test based on Hessian
472	>	*/
473	>	decodedir(uvw[0], av->udir);
474	>	VCROSS(uvw[1], uvw[2], uvw[0]);
475	>	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
476	>	delta_t2 += d*d;
477	>	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
478	>	delta_t2 += d*d;
479	>	if (delta_t2 >= ambacc*ambacc)
480	>	continue;
481	>	/*
482	>	*  Test for potential light leak
483	>	*/
484	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
485	>	continue;
486	>	/*
487	>	*  Extrapolate value and compute final weight (hat function)
488	>	*/
489	>	if (!extambient(ct, av, r->rop, rn, uvw))
490	>	continue;
491	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
492	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
493	>	scalecolor(ct, d);
494	>	addcolor(acol, ct);
495	>	wsum += d;
496	>	}
497	>	return(wsum);
498	>	}
499	>
500	>
501	>	static int
502	>	makeambient(            /* make a new ambient value for storage */
503	>	COLOR  acol,
504	>	RAY  *r,
505	>	FVECT  rn,
506	>	int  al
507	>	)
508	>	{
509	>	AMBVAL  amb;
510	>	FVECT   uvw[3];
511	>	int     i;
512	>
513	>	amb.weight = 1.0;                       /* compute weight */
514	>	for (i = al; i-- > 0; )
515	>	amb.weight *= AVGREFL;
516	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
517	>	amb.weight = 1.25*r->rweight;
518	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
519	>	/* compute ambient */
520	>	i = doambient(acol, r, amb.weight,
521	>	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
522	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
523	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
524	>	return(i);
525	>	/* store value */
526	>	VCOPY(amb.pos, r->rop);
527	>	amb.ndir = encodedir(r->ron);
528	>	amb.udir = encodedir(uvw[0]);
529	>	amb.lvl = al;
530	>	copycolor(amb.val, acol);
531	>	/* insert into tree */
532	>	avsave(&amb);                           /* and save to file */
533	>	if (rn != r->ron) {                     /* texture */
534	>	VCOPY(uvw[2], r->ron);
535	>	extambient(acol, &amb, r->rop, rn, uvw);
536	>	}
537	>	return(1);
538	>	}
539	>
540	>
541	>	static int
542	>	extambient(             /* extrapolate value at pv, nv */
543	>	COLOR  cr,
544	>	AMBVAL   *ap,
545	>	FVECT  pv,
546	>	FVECT  nv,
547	>	FVECT  uvw[3]
548	>	)
549	>	{
550	>	static FVECT    my_uvw[3];
551	>	FVECT           v1;
552	>	int             i;
553	>	double          d = 1.0;        /* zeroeth order */
554	>
555	>	if (uvw == NULL) {              /* need local coordinates? */
556	>	decodedir(my_uvw[2], ap->ndir);
557	>	decodedir(my_uvw[0], ap->udir);
558	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
559	>	uvw = my_uvw;
560	>	}
561	>	for (i = 3; i--; )              /* gradient due to translation */
562	>	d += (pv[i] - ap->pos[i]) *
563	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
564	>
565	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
566	>	for (i = 3; i--; )
567	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
568	>
569	>	if (d <= 0.0) {
570	>	setcolor(cr, 0.0, 0.0, 0.0);
571	>	return(0);              /* should not use if we can avoid it */
572	>	}
573	>	copycolor(cr, ap->val);
574	>	scalecolor(cr, d);
575	>	return(1);
576	>	}
577	>
578	>
579	>	static void
580	>	avinsert(                               /* insert ambient value in our tree */
581	>	AMBVAL *av
582	>	)
583	>	{
584	>	AMBTREE  *at;
585	>	AMBVAL  *ap;
586	>	AMBVAL  avh;
587	>	FVECT  ck0;
588	>	double  s;
589	>	int  branch;
590	>	int  i;
591	>
592	>	if (av->rad[0] <= FTINY)
593	>	error(CONSISTENCY, "zero ambient radius in avinsert");
594	>	at = &atrunk;
595	>	VCOPY(ck0, thescene.cuorg);
596	>	s = thescene.cusize;
597	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
598	>	if (at->kid == NULL)
599	>	if ((at->kid = newambtree()) == NULL)
600	>	error(SYSTEM, "out of memory in avinsert");
601	>	s *= 0.5;
602	>	branch = 0;
603	>	for (i = 0; i < 3; i++)
604	>	if (av->pos[i] > ck0[i] + s) {
605	>	ck0[i] += s;
606	>	branch |= 1 << i;
607	>	}
608	>	at = at->kid + branch;
609	>	}
610	>	avh.next = at->alist;           /* order by increasing level */
611	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
612	>	if ( ap->next->lvl > av->lvl ||
613	>	(ap->next->lvl == av->lvl) &
614	>	(ap->next->weight <= av->weight) )
615	>	break;
616	>	av->next = ap->next;
617	>	ap->next = (AMBVAL*)av;
618	>	at->alist = avh.next;
619	>	}
620	>
621	>
622	>	#else /* ! NEWAMB */
623	>
624	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
625	>	AMBTREE *at, FVECT c0, double s);
626	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
627	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
628	>
629	>
630	>	void
631	>	multambient(            /* compute ambient component & multiply by coef. */
632	>	COLOR  aval,
633	>	RAY  *r,
634	>	FVECT  nrm
635	>	)
636	>	{
637	>	static int  rdepth = 0;                 /* ambient recursion */
638	>	COLOR   acol;
639	>	double  d, l;
640	>
641	>	if (ambdiv <= 0)                        /* no ambient calculation */
642		goto dumbamb;
643	<	goto done;
643	>	/* check number of bounces */
644	>	if (rdepth >= ambounce)
645	>	goto dumbamb;
646	>	/* check ambient list */
647	>	if (ambincl != -1 && r->ro != NULL &&
648	>	ambincl != inset(ambset, r->ro->omod))
649	>	goto dumbamb;
650
651	<	dumbamb:                                        /* return global value */
652	<	copycolor(acol, ambval);
653	<	done:                                           /* must finish here! */
651	>	if (ambacc <= FTINY) {                  /* no ambient storage */
652	>	copycolor(acol, aval);
653	>	rdepth++;
654	>	d = doambient(acol, r, r->rweight, NULL, NULL);
655	>	rdepth--;
656	>	if (d <= FTINY)
657	>	goto dumbamb;
658	>	copycolor(aval, acol);
659	>	return;
660	>	}
661	>
662	>	if (tracktime)                          /* sort to minimize thrashing */
663	>	sortambvals(0);
664	>	/* interpolate ambient value */
665	>	setcolor(acol, 0.0, 0.0, 0.0);
666	>	d = sumambient(acol, r, nrm, rdepth,
667	>	&atrunk, thescene.cuorg, thescene.cusize);
668	>	if (d > FTINY) {
669	>	d = 1.0/d;
670	>	scalecolor(acol, d);
671	>	multcolor(aval, acol);
672	>	return;
673	>	}
674	>	rdepth++;                               /* need to cache new value */
675	>	d = makeambient(acol, r, nrm, rdepth-1);
676		rdepth--;
677	+	if (d > FTINY) {
678	+	multcolor(aval, acol);          /* got new value */
679	+	return;
680	+	}
681	+	dumbamb:                                        /* return global value */
682	+	if ((ambvwt <= 0) | (navsum == 0)) {
683	+	multcolor(aval, ambval);
684	+	return;
685	+	}
686	+	l = bright(ambval);                     /* average in computations */
687	+	if (l > FTINY) {
688	+	d = (log(l)*(double)ambvwt + avsum) /
689	+	(double)(ambvwt + navsum);
690	+	d = exp(d) / l;
691	+	scalecolor(aval, d);
692	+	multcolor(aval, ambval);        /* apply color of ambval */
693	+	} else {
694	+	d = exp( avsum / (double)navsum );
695	+	scalecolor(aval, d);            /* neutral color */
696	+	}
697		}
698
699
700	<	double
701	<	sumambient(acol, r, at, c0, s)          /* get interpolated ambient value */
702	<	COLOR  acol;
703	<	register RAY  *r;
704	<	AMBTREE  *at;
705	<	FVECT  c0;
706	<	double  s;
700	>	static double
701	>	sumambient(     /* get interpolated ambient value */
702	>	COLOR  acol,
703	>	RAY  *r,
704	>	FVECT  rn,
705	>	int  al,
706	>	AMBTREE  *at,
707	>	FVECT  c0,
708	>	double  s
709	>	)
710		{
711	<	extern double  sqrt();
147	<	double  d, e1, e2, wt, wsum;
711	>	double  d, e1, e2, wt, wsum;
712		COLOR  ct;
713		FVECT  ck0;
714		int  i;
715	<	register int  j;
716	<	register AMBVAL  *av;
717	<	/* do this node */
715	>	int  j;
716	>	AMBVAL   *av;
717	>
718		wsum = 0.0;
719	+	/* do this node */
720		for (av = at->alist; av != NULL; av = av->next) {
721	+	double  rn_dot = -2.0;
722	+	if (tracktime)
723	+	av->latick = ambclock;
724		/*
725	<	*  Ray strength test.
725	>	*  Ambient level test.
726		*/
727	<	if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY)
728	<	continue;
727	>	if (av->lvl > al ||     /* list sorted, so this works */
728	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
729	>	break;
730		/*
731		*  Ambient radius test.
732		*/
733	<	e1 = 0.0;
734	<	for (j = 0; j < 3; j++) {
166	<	d = av->pos[j] - r->rop[j];
167	<	e1 += d * d;
168	<	}
169	<	e1 /= av->rad * av->rad;
733	>	VSUB(ck0, av->pos, r->rop);
734	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
735		if (e1 > ambacc*ambacc*1.21)
736		continue;
737		/*
738	<	*  Normal direction test.
738	>	*  Direction test using closest normal.
739		*/
740	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
741	<	if (e2 < 0.0) e2 = 0.0;
742	<	if (e1 + e2 > ambacc*ambacc*1.21)
740	>	d = DOT(av->dir, r->ron);
741	>	if (rn != r->ron) {
742	>	rn_dot = DOT(av->dir, rn);
743	>	if (rn_dot > 1.0-FTINY)
744	>	rn_dot = 1.0-FTINY;
745	>	if (rn_dot >= d-FTINY) {
746	>	d = rn_dot;
747	>	rn_dot = -2.0;
748	>	}
749	>	}
750	>	e2 = (1.0 - d) * r->rweight;
751	>	if (e2 < 0.0)
752	>	e2 = 0.0;
753	>	else if (e1 + e2 > ambacc*ambacc*1.21)
754		continue;
755		/*
756		*  Ray behind test.
#	Line 183 | Line 759 | double  s;
759		for (j = 0; j < 3; j++)
760		d += (r->rop[j] - av->pos[j]) *
761		(av->dir[j] + r->ron[j]);
762	<	if (d*0.5 < -minarad*ambacc)
762	>	if (d*0.5 < -minarad*ambacc-.001)
763		continue;
764		/*
765		*  Jittering final test reduces image artifacts.
766		*/
767	<	wt = sqrt(e1) + sqrt(e2);
768	<	wt *= .9 + .2*frandom();
769	<	if (wt > ambacc)
767	>	e1 = sqrt(e1);
768	>	e2 = sqrt(e2);
769	>	wt = e1 + e2;
770	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
771		continue;
772	+	/*
773	+	*  Recompute directional error using perturbed normal
774	+	*/
775	+	if (rn_dot > 0.0) {
776	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
777	+	wt = e1 + e2;
778	+	}
779		if (wt <= 1e-3)
780		wt = 1e3;
781		else
782		wt = 1.0 / wt;
783		wsum += wt;
784	<	copycolor(ct, av->val);
784	>	extambient(ct, av, r->rop, rn);
785		scalecolor(ct, wt);
786		addcolor(acol, ct);
787		}
#	Line 216 | Line 800 | double  s;
800		break;
801		}
802		if (j == 3)
803	<	wsum += sumambient(acol, r, at->kid+i, ck0, s);
803	>	wsum += sumambient(acol, r, rn, al,
804	>	at->kid+i, ck0, s);
805		}
806		return(wsum);
807		}
808
809
810	<	double
811	<	makeambient(acol, r)            /* make a new ambient value */
812	<	COLOR  acol;
813	<	register RAY  *r;
810	>	static double
811	>	makeambient(            /* make a new ambient value for storage */
812	>	COLOR  acol,
813	>	RAY  *r,
814	>	FVECT  rn,
815	>	int  al
816	>	)
817		{
818	<	AMBVAL  amb;
818	>	AMBVAL  amb;
819		FVECT   gp, gd;
820	+	int     i;
821
822	<	amb.rad = doambient(acol, r, gp, gd);   /* compute ambient */
823	<	if (amb.rad == 0.0)
822	>	amb.weight = 1.0;                       /* compute weight */
823	>	for (i = al; i-- > 0; )
824	>	amb.weight *= AVGREFL;
825	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
826	>	amb.weight = 1.25*r->rweight;
827	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
828	>	/* compute ambient */
829	>	amb.rad = doambient(acol, r, amb.weight, gp, gd);
830	>	if (amb.rad <= FTINY) {
831	>	setcolor(acol, 0.0, 0.0, 0.0);
832		return(0.0);
833	<	/* store it */
833	>	}
834	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
835	>	/* store value */
836		VCOPY(amb.pos, r->rop);
837		VCOPY(amb.dir, r->ron);
838	<	amb.lvl = r->rlvl;
240	<	amb.weight = r->rweight;
838	>	amb.lvl = al;
839		copycolor(amb.val, acol);
840		VCOPY(amb.gpos, gp);
841		VCOPY(amb.gdir, gd);
842		/* insert into tree */
843	<	avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize);
844	<	avsave(&amb);                           /* write to file */
843	>	avsave(&amb);                           /* and save to file */
844	>	if (rn != r->ron)
845	>	extambient(acol, &amb, r->rop, rn);     /* texture */
846		return(amb.rad);
847		}
848
849
850	<	static
851	<	avsave(av)                              /* save an ambient value */
852	<	AMBVAL  *av;
850	>	static void
851	>	extambient(             /* extrapolate value at pv, nv */
852	>	COLOR  cr,
853	>	AMBVAL   *ap,
854	>	FVECT  pv,
855	>	FVECT  nv
856	>	)
857		{
858	<	#ifdef  AMBFLUSH
859	<	static int  nunflshed = 0;
860	<	#endif
861	<	if (ambfp == NULL)
858	>	FVECT  v1;
859	>	int  i;
860	>	double  d;
861	>
862	>	d = 1.0;                        /* zeroeth order */
863	>	/* gradient due to translation */
864	>	for (i = 0; i < 3; i++)
865	>	d += ap->gpos[i]*(pv[i]-ap->pos[i]);
866	>	/* gradient due to rotation */
867	>	VCROSS(v1, ap->dir, nv);
868	>	d += DOT(ap->gdir, v1);
869	>	if (d <= 0.0) {
870	>	setcolor(cr, 0.0, 0.0, 0.0);
871		return;
260	–	if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1)
261	–	goto writerr;
262	–	#ifdef  AMBFLUSH
263	–	if (++nunflshed >= AMBFLUSH) {
264	–	if (fflush(ambfp) == EOF)
265	–	goto writerr;
266	–	nunflshed = 0;
872		}
873	<	#endif
874	<	return;
270	<	writerr:
271	<	error(SYSTEM, "error writing ambient file");
873	>	copycolor(cr, ap->val);
874	>	scalecolor(cr, d);
875		}
876
877
878	<	static
879	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
880	<	AMBVAL  *aval;
881	<	register AMBTREE  *at;
279	<	FVECT  c0;
280	<	double  s;
878	>	static void
879	>	avinsert(                               /* insert ambient value in our tree */
880	>	AMBVAL *av
881	>	)
882		{
883	+	AMBTREE  *at;
884	+	AMBVAL  *ap;
885	+	AMBVAL  avh;
886		FVECT  ck0;
887	+	double  s;
888		int  branch;
889	<	register AMBVAL  *av;
285	<	register int  i;
889	>	int  i;
890
891	<	if ((av = newambval()) == NULL)
892	<	goto memerr;
893	<	copystruct(av, aval);
894	<	VCOPY(ck0, c0);
891	>	if (av->rad <= FTINY)
892	>	error(CONSISTENCY, "zero ambient radius in avinsert");
893	>	at = &atrunk;
894	>	VCOPY(ck0, thescene.cuorg);
895	>	s = thescene.cusize;
896		while (s*(OCTSCALE/2) > av->rad*ambacc) {
897		if (at->kid == NULL)
898		if ((at->kid = newambtree()) == NULL)
899	<	goto memerr;
899	>	error(SYSTEM, "out of memory in avinsert");
900		s *= 0.5;
901		branch = 0;
902		for (i = 0; i < 3; i++)
#	Line 301 | Line 906 | double  s;
906		}
907		at = at->kid + branch;
908		}
909	<	av->next = at->alist;
910	<	at->alist = av;
909	>	avh.next = at->alist;           /* order by increasing level */
910	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
911	>	if ( ap->next->lvl > av->lvl ||
912	>	(ap->next->lvl == av->lvl) &
913	>	(ap->next->weight <= av->weight) )
914	>	break;
915	>	av->next = ap->next;
916	>	ap->next = (AMBVAL*)av;
917	>	at->alist = avh.next;
918	>	}
919	>
920	>	#endif  /* ! NEWAMB */
921	>
922	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
923	>
924	>	static void
925	>	initambfile(            /* initialize ambient file */
926	>	int  cre8
927	>	)
928	>	{
929	>	extern char  *progname, *octname;
930	>	static char  *mybuf = NULL;
931	>
932	>	#ifdef  F_SETLKW
933	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
934	>	#endif
935	>	SET_FILE_BINARY(ambfp);
936	>	if (mybuf == NULL)
937	>	mybuf = (char *)bmalloc(BUFSIZ+8);
938	>	setbuf(ambfp, mybuf);
939	>	if (cre8) {                     /* new file */
940	>	newheader("RADIANCE", ambfp);
941	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
942	>	progname, colval(ambval,RED),
943	>	colval(ambval,GRN), colval(ambval,BLU),
944	>	ambvwt, ambounce, ambacc);
945	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
946	>	ambdiv, ambssamp, ambres);
947	>	if (octname != NULL)
948	>	fputs(octname, ambfp);
949	>	fputc('\n', ambfp);
950	>	fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
951	>	fputnow(ambfp);
952	>	fputformat(AMBFMT, ambfp);
953	>	fputc('\n', ambfp);
954	>	putambmagic(ambfp);
955	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
956	>	error(USER, "bad ambient file");
957	>	}
958	>
959	>
960	>	static void
961	>	avsave(                         /* insert and save an ambient value */
962	>	AMBVAL  *av
963	>	)
964	>	{
965	>	avstore(av);
966	>	if (ambfp == NULL)
967	>	return;
968	>	if (writambval(av, ambfp) < 0)
969	>	goto writerr;
970	>	if (++nunflshed >= AMBFLUSH)
971	>	if (ambsync() == EOF)
972	>	goto writerr;
973		return;
974	<	memerr:
975	<	error(SYSTEM, "out of memory in avinsert");
974	>	writerr:
975	>	error(SYSTEM, "error writing to ambient file");
976		}
977	+
978	+
979	+	static AMBVAL *
980	+	avstore(                                /* allocate memory and save aval */
981	+	AMBVAL  *aval
982	+	)
983	+	{
984	+	AMBVAL  *av;
985	+	double  d;
986	+
987	+	if ((av = newambval()) == NULL)
988	+	error(SYSTEM, "out of memory in avstore");
989	+	*av = *aval;
990	+	av->latick = ambclock;
991	+	av->next = NULL;
992	+	nambvals++;
993	+	d = bright(av->val);
994	+	if (d > FTINY) {                /* add to log sum for averaging */
995	+	avsum += log(d);
996	+	navsum++;
997	+	}
998	+	avinsert(av);                   /* insert in our cache tree */
999	+	return(av);
1000	+	}
1001	+
1002	+
1003	+	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
1004	+
1005	+	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
1006	+
1007	+
1008	+	static AMBTREE *
1009	+	newambtree(void)                                /* allocate 8 ambient tree structs */
1010	+	{
1011	+	AMBTREE  *atp, *upperlim;
1012	+
1013	+	if (atfreelist == NULL) {       /* get more nodes */
1014	+	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
1015	+	if (atfreelist == NULL)
1016	+	return(NULL);
1017	+	/* link new free list */
1018	+	upperlim = atfreelist + 8*(ATALLOCSZ-1);
1019	+	for (atp = atfreelist; atp < upperlim; atp += 8)
1020	+	atp->kid = atp + 8;
1021	+	atp->kid = NULL;
1022	+	}
1023	+	atp = atfreelist;
1024	+	atfreelist = atp->kid;
1025	+	memset((char *)atp, '\0', 8*sizeof(AMBTREE));
1026	+	return(atp);
1027	+	}
1028	+
1029	+
1030	+	static void
1031	+	freeambtree(                    /* free 8 ambient tree structs */
1032	+	AMBTREE  *atp
1033	+	)
1034	+	{
1035	+	atp->kid = atfreelist;
1036	+	atfreelist = atp;
1037	+	}
1038	+
1039	+
1040	+	static void
1041	+	unloadatree(                    /* unload an ambient value tree */
1042	+	AMBTREE  *at,
1043	+	unloadtf_t *f
1044	+	)
1045	+	{
1046	+	AMBVAL  *av;
1047	+	int  i;
1048	+	/* transfer values at this node */
1049	+	for (av = at->alist; av != NULL; av = at->alist) {
1050	+	at->alist = av->next;
1051	+	(*f)(av);
1052	+	}
1053	+	if (at->kid == NULL)
1054	+	return;
1055	+	for (i = 0; i < 8; i++)         /* transfer and free children */
1056	+	unloadatree(at->kid+i, f);
1057	+	freeambtree(at->kid);
1058	+	at->kid = NULL;
1059	+	}
1060	+
1061	+
1062	+	static struct avl {
1063	+	AMBVAL  *p;
1064	+	unsigned long   t;
1065	+	}       *avlist1;                       /* ambient value list with ticks */
1066	+	static AMBVAL   **avlist2;              /* memory positions for sorting */
1067	+	static int      i_avlist;               /* index for lists */
1068	+
1069	+	static int alatcmp(const void *av1, const void *av2);
1070	+
1071	+	static void
1072	+	avfree(AMBVAL *av)
1073	+	{
1074	+	free(av);
1075	+	}
1076	+
1077	+	static void
1078	+	av2list(
1079	+	AMBVAL *av
1080	+	)
1081	+	{
1082	+	#ifdef DEBUG
1083	+	if (i_avlist >= nambvals)
1084	+	error(CONSISTENCY, "too many ambient values in av2list1");
1085	+	#endif
1086	+	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1087	+	avlist1[i_avlist++].t = av->latick;
1088	+	}
1089	+
1090	+
1091	+	static int
1092	+	alatcmp(                        /* compare ambient values for MRA */
1093	+	const void *av1,
1094	+	const void *av2
1095	+	)
1096	+	{
1097	+	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1098	+	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1099	+	}
1100	+
1101	+
1102	+	/* GW NOTE 2002/10/3:
1103	+	* I used to compare AMBVAL pointers, but found that this was the
1104	+	* cause of a serious consistency error with gcc, since the optimizer
1105	+	* uses some dangerous trick in pointer subtraction that
1106	+	* assumes pointers differ by exact struct size increments.
1107	+	*/
1108	+	static int
1109	+	aposcmp(                        /* compare ambient value positions */
1110	+	const void      *avp1,
1111	+	const void      *avp2
1112	+	)
1113	+	{
1114	+	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1115	+	if (diff < 0)
1116	+	return(-1);
1117	+	return(diff > 0);
1118	+	}
1119	+
1120	+
1121	+	static int
1122	+	avlmemi(                                /* find list position from address */
1123	+	AMBVAL  *avaddr
1124	+	)
1125	+	{
1126	+	AMBVAL  **avlpp;
1127	+
1128	+	avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2,
1129	+	nambvals, sizeof(AMBVAL *), &aposcmp);
1130	+	if (avlpp == NULL)
1131	+	error(CONSISTENCY, "address not found in avlmemi");
1132	+	return(avlpp - avlist2);
1133	+	}
1134	+
1135	+
1136	+	static void
1137	+	sortambvals(                    /* resort ambient values */
1138	+	int     always
1139	+	)
1140	+	{
1141	+	AMBTREE  oldatrunk;
1142	+	AMBVAL  tav, *tap, *pnext;
1143	+	int     i, j;
1144	+	/* see if it's time yet */
1145	+	if (!always && (ambclock++ < lastsort+sortintvl ||
1146	+	nambvals < SORT_THRESH))
1147	+	return;
1148	+	/*
1149	+	* The idea here is to minimize memory thrashing
1150	+	* in VM systems by improving reference locality.
1151	+	* We do this by periodically sorting our stored ambient
1152	+	* values in memory in order of most recently to least
1153	+	* recently accessed.  This ordering was chosen so that new
1154	+	* ambient values (which tend to be less important) go into
1155	+	* higher memory with the infrequently accessed values.
1156	+	*      Since we expect our values to need sorting less
1157	+	* frequently as the process continues, we double our
1158	+	* waiting interval after each call.
1159	+	*      This routine is also called by setambacc() with
1160	+	* the "always" parameter set to 1 so that the ambient
1161	+	* tree will be rebuilt with the new accuracy parameter.
1162	+	*/
1163	+	if (tracktime) {                /* allocate pointer arrays to sort */
1164	+	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1165	+	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1166	+	} else {
1167	+	avlist2 = NULL;
1168	+	avlist1 = NULL;
1169	+	}
1170	+	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1171	+	if (avlist2 != NULL)
1172	+	free((void *)avlist2);
1173	+	if (always) {           /* rebuild without sorting */
1174	+	oldatrunk = atrunk;
1175	+	atrunk.alist = NULL;
1176	+	atrunk.kid = NULL;
1177	+	unloadatree(&oldatrunk, &avinsert);
1178	+	}
1179	+	} else {                        /* sort memory by last access time */
1180	+	/*
1181	+	* Sorting memory is tricky because it isn't contiguous.
1182	+	* We have to sort an array of pointers by MRA and also
1183	+	* by memory position.  We then copy values in "loops"
1184	+	* to minimize memory hits.  Nevertheless, we will visit
1185	+	* everyone at least twice, and this is an expensive process
1186	+	* when we're thrashing, which is when we need to do it.
1187	+	*/
1188	+	#ifdef DEBUG
1189	+	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1190	+	nambvals, ambclock);
1191	+	eputs(errmsg);
1192	+	#endif
1193	+	i_avlist = 0;
1194	+	unloadatree(&atrunk, &av2list); /* empty current tree */
1195	+	#ifdef DEBUG
1196	+	if (i_avlist < nambvals)
1197	+	error(CONSISTENCY, "missing ambient values in sortambvals");
1198	+	#endif
1199	+	qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp);
1200	+	qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1201	+	for (i = 0; i < nambvals; i++) {
1202	+	if (avlist1[i].p == NULL)
1203	+	continue;
1204	+	tap = avlist2[i];
1205	+	tav = *tap;
1206	+	for (j = i; (pnext = avlist1[j].p) != tap;
1207	+	j = avlmemi(pnext)) {
1208	+	*(avlist2[j]) = *pnext;
1209	+	avinsert(avlist2[j]);
1210	+	avlist1[j].p = NULL;
1211	+	}
1212	+	*(avlist2[j]) = tav;
1213	+	avinsert(avlist2[j]);
1214	+	avlist1[j].p = NULL;
1215	+	}
1216	+	free((void *)avlist1);
1217	+	free((void *)avlist2);
1218	+	/* compute new sort interval */
1219	+	sortintvl = ambclock - lastsort;
1220	+	if (sortintvl >= MAX_SORT_INTVL/2)
1221	+	sortintvl = MAX_SORT_INTVL;
1222	+	else
1223	+	sortintvl <<= 1;        /* wait twice as long next */
1224	+	#ifdef DEBUG
1225	+	eputs("done\n");
1226	+	#endif
1227	+	}
1228	+	if (ambclock >= MAXACLOCK)
1229	+	ambclock = MAXACLOCK/2;
1230	+	lastsort = ambclock;
1231	+	}
1232	+
1233	+
1234	+	#ifdef  F_SETLKW
1235	+
1236	+	static void
1237	+	aflock(                 /* lock/unlock ambient file */
1238	+	int  typ
1239	+	)
1240	+	{
1241	+	static struct flock  fls;       /* static so initialized to zeroes */
1242	+
1243	+	if (typ == fls.l_type)          /* already called? */
1244	+	return;
1245	+	fls.l_type = typ;
1246	+	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1247	+	error(SYSTEM, "cannot (un)lock ambient file");
1248	+	}
1249	+
1250	+
1251	+	int
1252	+	ambsync(void)                   /* synchronize ambient file */
1253	+	{
1254	+	long  flen;
1255	+	AMBVAL  avs;
1256	+	int  n;
1257	+
1258	+	if (ambfp == NULL)      /* no ambient file? */
1259	+	return(0);
1260	+	/* gain appropriate access */
1261	+	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1262	+	/* see if file has grown */
1263	+	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1264	+	goto seekerr;
1265	+	if ((n = flen - lastpos) > 0) {         /* file has grown */
1266	+	if (ambinp == NULL) {           /* use duplicate filedes */
1267	+	ambinp = fdopen(dup(fileno(ambfp)), "r");
1268	+	if (ambinp == NULL)
1269	+	error(SYSTEM, "fdopen failed in ambsync");
1270	+	}
1271	+	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1272	+	goto seekerr;
1273	+	while (n >= AMBVALSIZ) {        /* load contributed values */
1274	+	if (!readambval(&avs, ambinp)) {
1275	+	sprintf(errmsg,
1276	+	"ambient file \"%s\" corrupted near character %ld",
1277	+	ambfile, flen - n);
1278	+	error(WARNING, errmsg);
1279	+	break;
1280	+	}
1281	+	avstore(&avs);
1282	+	n -= AMBVALSIZ;
1283	+	}
1284	+	lastpos = flen - n;
1285	+	/*** seek always as safety measure
1286	+	if (n) ***/                     /* alignment */
1287	+	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1288	+	goto seekerr;
1289	+	}
1290	+	n = fflush(ambfp);                      /* calls write() at last */
1291	+	if (n != EOF)
1292	+	lastpos += (long)nunflshed*AMBVALSIZ;
1293	+	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1294	+	goto seekerr;
1295	+
1296	+	aflock(F_UNLCK);                        /* release file */
1297	+	nunflshed = 0;
1298	+	return(n);
1299	+	seekerr:
1300	+	error(SYSTEM, "seek failed in ambsync");
1301	+	return -1; /* pro forma return */
1302	+	}
1303	+
1304	+	#else   /* ! F_SETLKW */
1305	+
1306	+	int
1307	+	ambsync(void)                   /* flush ambient file */
1308	+	{
1309	+	if (ambfp == NULL)
1310	+	return(0);
1311	+	nunflshed = 0;
1312	+	return(fflush(ambfp));
1313	+	}
1314	+
1315	+	#endif  /* ! F_SETLKW */

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