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

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.3 by greg, Wed Mar 4 16:52:13 1992 UTC vs.
Revision 2.98 by greg, Sun Aug 23 00:17:12 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  nunflshed = 0;      /* number of unflushed ambient values */
38
39	<	#define  newambval()    (AMBVAL *)bmalloc(sizeof(AMBVAL))
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
47	–	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
53
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	<	setambres(ar)                           /* set ambient resolution */
65	<	int  ar;
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	>	#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 (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	<	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	<	while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1)
164	<	avinsert(&amb, &atrunk, thescene.cuorg,
165	<	thescene.cusize);
166	<	/* align */
167	<	fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1);
168	<	} else if ((ambfp = fopen(afile, "w")) == NULL) {
169	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
170	<	afile);
171	<	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  F_SETLKW
200	+	aflock(F_UNLCK);                        /* release file */
201	+	#endif
202		}
203
204
205	<	ambnotify(obj)                  /* record new modifier */
206	<	OBJECT  obj;
205	>	void
206	>	ambdone(void)                   /* close ambient file and free memory */
207		{
208	+	if (ambfp != NULL) {            /* close ambient file */
209	+	ambsync();
210	+	fclose(ambfp);
211	+	ambfp = NULL;
212	+	if (ambinp != NULL) {
213	+	fclose(ambinp);
214	+	ambinp = NULL;
215	+	}
216	+	lastpos = -1;
217	+	}
218	+	/* free ambient tree */
219	+	unloadatree(&atrunk, &avfree);
220	+	/* reset state variables */
221	+	avsum = 0.;
222	+	navsum = 0;
223	+	nambvals = 0;
224	+	nambshare = 0;
225	+	ambclock = 0;
226	+	lastsort = 0;
227	+	sortintvl = SORT_INTVL;
228	+	}
229	+
230	+
231	+	void
232	+	ambnotify(                      /* record new modifier */
233	+	OBJECT  obj
234	+	)
235	+	{
236		static int  hitlimit = 0;
237	<	register OBJREC  *o = objptr(obj);
238	<	register char  **amblp;
237	>	OBJREC   *o;
238	>	char  **amblp;
239
240	+	if (obj == OVOID) {             /* starting over */
241	+	ambset[0] = 0;
242	+	hitlimit = 0;
243	+	return;
244	+	}
245	+	o = objptr(obj);
246		if (hitlimit || !ismodifier(o->otype))
247		return;
248		for (amblp = amblist; *amblp != NULL; amblp++)
#	Line 107 | Line 257 | OBJECT  obj;
257		}
258		}
259
260	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
261
262	<	ambient(acol, r)                /* compute ambient component for ray */
263	<	COLOR  acol;
264	<	register RAY  *r;
262	>	#ifndef OLDAMB
263	>
264	>	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
265	>
266	>	static int      plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang);
267	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
268	>	AMBTREE *at, FVECT c0, double s);
269	>	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
270	>	static int      extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
271	>	FVECT uvw[3]);
272	>
273	>	void
274	>	multambient(            /* compute ambient component & multiply by coef. */
275	>	COLOR  aval,
276	>	RAY  *r,
277	>	FVECT  nrm
278	>	)
279		{
280		static int  rdepth = 0;                 /* ambient recursion */
281	<	double  d;
281	>	COLOR   acol, caustic;
282	>	int     ok;
283	>	double  d, l;
284
285	+	/* PMAP: Factor in ambient from photon map, if enabled and ray is
286	+	* ambient. Return as all ambient components accounted for, else
287	+	* continue. */
288	+	if (ambPmap(aval, r, rdepth))
289	+	return;
290	+
291	+	/* PMAP: Factor in specular-diffuse ambient (caustics) from photon
292	+	* map, if enabled and ray is primary, else caustic is zero.  Continue
293	+	* with RADIANCE ambient calculation */
294	+	copycolor(caustic, aval);
295	+	ambPmapCaustic(caustic, r, rdepth);
296	+
297		if (ambdiv <= 0)                        /* no ambient calculation */
298		goto dumbamb;
299		/* check number of bounces */
#	Line 126 | Line 305 | register RAY  *r;
305		goto dumbamb;
306
307		if (ambacc <= FTINY) {                  /* no ambient storage */
308	+	copycolor(acol, aval);
309		rdepth++;
310	<	d = doambient(acol, r, r->rweight, NULL, NULL);
310	>	ok = doambient(acol, r, r->rweight,
311	>	NULL, NULL, NULL, NULL, NULL);
312		rdepth--;
313	<	if (d == 0.0)
313	>	if (!ok)
314		goto dumbamb;
315	+	copycolor(aval, acol);
316	+
317	+	/* PMAP: add in caustic */
318	+	addcolor(aval, caustic);
319		return;
320		}
321	<	/* get ambient value */
321	>
322	>	if (tracktime)                          /* sort to minimize thrashing */
323	>	sortambvals(0);
324	>	/* interpolate ambient value */
325		setcolor(acol, 0.0, 0.0, 0.0);
326	<	d = sumambient(acol, r, rdepth,
326	>	d = sumambient(acol, r, nrm, rdepth,
327		&atrunk, thescene.cuorg, thescene.cusize);
328	<	if (d > FTINY)
329	<	scalecolor(acol, 1.0/d);
330	<	else {
331	<	d = makeambient(acol, r, rdepth++);
328	>
329	>	if (d > FTINY) {
330	>	d = 1.0/d;
331	>	scalecolor(acol, d);
332	>	multcolor(aval, acol);
333	>
334	>	/* PMAP: add in caustic */
335	>	addcolor(aval, caustic);
336	>	return;
337	>	}
338	>
339	>	rdepth++;                               /* need to cache new value */
340	>	ok = makeambient(acol, r, nrm, rdepth-1);
341	>	rdepth--;
342	>
343	>	if (ok) {
344	>	multcolor(aval, acol);          /* computed new value */
345	>
346	>	/* PMAP: add in caustic */
347	>	addcolor(aval, caustic);
348	>	return;
349	>	}
350	>
351	>	dumbamb:                                        /* return global value */
352	>	if ((ambvwt <= 0) | (navsum == 0)) {
353	>	multcolor(aval, ambval);
354	>
355	>	/* PMAP: add in caustic */
356	>	addcolor(aval, caustic);
357	>	return;
358	>	}
359	>
360	>	l = bright(ambval);                     /* average in computations */
361	>	if (l > FTINY) {
362	>	d = (log(l)*(double)ambvwt + avsum) /
363	>	(double)(ambvwt + navsum);
364	>	d = exp(d) / l;
365	>	scalecolor(aval, d);
366	>	multcolor(aval, ambval);        /* apply color of ambval */
367	>	} else {
368	>	d = exp( avsum / (double)navsum );
369	>	scalecolor(aval, d);            /* neutral color */
370	>	}
371	>	}
372	>
373	>
374	>	/* Plug a potential leak where ambient cache value is occluded */
375	>	static int
376	>	plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
377	>	{
378	>	const double    cost70sq = 0.1169778;   /* cos(70deg)^2 */
379	>	RAY             rtst;
380	>	FVECT           vdif;
381	>	double          normdot, ndotd, nadotd;
382	>	double          a, b, c, t[2];
383	>
384	>	ang += 2.*PI*(ang < 0);                 /* check direction flags */
385	>	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
386	>	return(0);
387	>	/*
388	>	* Generate test ray, targeting 20 degrees above sample point plane
389	>	* along surface normal from cache position.  This should be high
390	>	* enough to miss local geometry we don't really care about.
391	>	*/
392	>	VSUB(vdif, ap->pos, r->rop);
393	>	normdot = DOT(anorm, r->ron);
394	>	ndotd = DOT(vdif, r->ron);
395	>	nadotd = DOT(vdif, anorm);
396	>	a = normdot*normdot - cost70sq;
397	>	b = 2.0*(normdot*ndotd - nadotd*cost70sq);
398	>	c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq;
399	>	if (quadratic(t, a, b, c) != 2)
400	>	return(1);                      /* should rarely happen */
401	>	if (t[1] <= FTINY)
402	>	return(0);                      /* should fail behind test */
403	>	rayorigin(&rtst, SHADOW, r, NULL);
404	>	VSUM(rtst.rdir, vdif, anorm, t[1]);     /* further dist. > plane */
405	>	rtst.rmax = normalize(rtst.rdir);       /* short ray test */
406	>	while (localhit(&rtst, &thescene)) {    /* check for occluder */
407	>	if (rtst.ro->omod != OVOID &&
408	>	(rtst.clipset == NULL ||
409	>	!inset(rtst.clipset, rtst.ro->omod)))
410	>	return(1);              /* plug light leak */
411	>	VCOPY(rtst.rorg, rtst.rop);     /* skip invisible surface */
412	>	rtst.rmax -= rtst.rot;
413	>	rayclear(&rtst);
414	>	}
415	>	return(0);                              /* seems we're OK */
416	>	}
417	>
418	>
419	>	static double
420	>	sumambient(             /* get interpolated ambient value */
421	>	COLOR  acol,
422	>	RAY  *r,
423	>	FVECT  rn,
424	>	int  al,
425	>	AMBTREE  *at,
426	>	FVECT  c0,
427	>	double  s
428	>	)
429	>	{                       /* initial limit is 10 degrees plus ambacc radians */
430	>	const double    minangle = 10.0 * PI/180.;
431	>	double          maxangle = minangle + ambacc;
432	>	double          wsum = 0.0;
433	>	FVECT           ck0;
434	>	int             i, j;
435	>	AMBVAL          *av;
436	>
437	>	if (at->kid != NULL) {          /* sum children first */
438	>	s *= 0.5;
439	>	for (i = 0; i < 8; i++) {
440	>	for (j = 0; j < 3; j++) {
441	>	ck0[j] = c0[j];
442	>	if (1<<j & i)
443	>	ck0[j] += s;
444	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
445	>	break;
446	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
447	>	break;
448	>	}
449	>	if (j == 3)
450	>	wsum += sumambient(acol, r, rn, al,
451	>	at->kid+i, ck0, s);
452	>	}
453	>	/* good enough? */
454	>	if (wsum >= 0.05 && s > minarad*10.0)
455	>	return(wsum);
456	>	}
457	>	/* adjust maximum angle */
458	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
459	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
460	>	/* sum this node */
461	>	for (av = at->alist; av != NULL; av = av->next) {
462	>	double  u, v, d, delta_r2, delta_t2;
463	>	COLOR   ct;
464	>	FVECT   uvw[3];
465	>	/* record access */
466	>	if (tracktime)
467	>	av->latick = ambclock;
468	>	/*
469	>	*  Ambient level test
470	>	*/
471	>	if (av->lvl > al ||     /* list sorted, so this works */
472	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
473	>	break;
474	>	/*
475	>	*  Direction test using unperturbed normal
476	>	*/
477	>	decodedir(uvw[2], av->ndir);
478	>	d = DOT(uvw[2], r->ron);
479	>	if (d <= 0.0)           /* >= 90 degrees */
480	>	continue;
481	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
482	>	if (delta_r2 >= maxangle*maxangle)
483	>	continue;
484	>	/*
485	>	*  Modified ray behind test
486	>	*/
487	>	VSUB(ck0, r->rop, av->pos);
488	>	d = DOT(ck0, uvw[2]);
489	>	if (d < -minarad*ambacc-.001)
490	>	continue;
491	>	d /= av->rad[0];
492	>	delta_t2 = d*d;
493	>	if (delta_t2 >= ambacc*ambacc)
494	>	continue;
495	>	/*
496	>	*  Elliptical radii test based on Hessian
497	>	*/
498	>	decodedir(uvw[0], av->udir);
499	>	VCROSS(uvw[1], uvw[2], uvw[0]);
500	>	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
501	>	delta_t2 += d*d;
502	>	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
503	>	delta_t2 += d*d;
504	>	if (delta_t2 >= ambacc*ambacc)
505	>	continue;
506	>	/*
507	>	*  Test for potential light leak
508	>	*/
509	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
510	>	continue;
511	>	/*
512	>	*  Extrapolate value and compute final weight (hat function)
513	>	*/
514	>	if (!extambient(ct, av, r->rop, rn, uvw))
515	>	continue;
516	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
517	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
518	>	scalecolor(ct, d);
519	>	addcolor(acol, ct);
520	>	wsum += d;
521	>	}
522	>	return(wsum);
523	>	}
524	>
525	>
526	>	static int
527	>	makeambient(            /* make a new ambient value for storage */
528	>	COLOR  acol,
529	>	RAY  *r,
530	>	FVECT  rn,
531	>	int  al
532	>	)
533	>	{
534	>	AMBVAL  amb;
535	>	FVECT   uvw[3];
536	>	int     i;
537	>
538	>	amb.weight = 1.0;                       /* compute weight */
539	>	for (i = al; i-- > 0; )
540	>	amb.weight *= AVGREFL;
541	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
542	>	amb.weight = 1.25*r->rweight;
543	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
544	>	/* compute ambient */
545	>	i = doambient(acol, r, amb.weight,
546	>	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
547	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
548	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
549	>	return(i);
550	>	/* store value */
551	>	VCOPY(amb.pos, r->rop);
552	>	amb.ndir = encodedir(r->ron);
553	>	amb.udir = encodedir(uvw[0]);
554	>	amb.lvl = al;
555	>	copycolor(amb.val, acol);
556	>	/* insert into tree */
557	>	avsave(&amb);                           /* and save to file */
558	>	if (rn != r->ron) {                     /* texture */
559	>	VCOPY(uvw[2], r->ron);
560	>	extambient(acol, &amb, r->rop, rn, uvw);
561	>	}
562	>	return(1);
563	>	}
564	>
565	>
566	>	static int
567	>	extambient(             /* extrapolate value at pv, nv */
568	>	COLOR  cr,
569	>	AMBVAL   *ap,
570	>	FVECT  pv,
571	>	FVECT  nv,
572	>	FVECT  uvw[3]
573	>	)
574	>	{
575	>	const double    min_d = 0.05;
576	>	static FVECT    my_uvw[3];
577	>	FVECT           v1;
578	>	int             i;
579	>	double          d = 1.0;        /* zeroeth order */
580	>
581	>	if (uvw == NULL) {              /* need local coordinates? */
582	>	decodedir(my_uvw[2], ap->ndir);
583	>	decodedir(my_uvw[0], ap->udir);
584	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
585	>	uvw = my_uvw;
586	>	}
587	>	for (i = 3; i--; )              /* gradient due to translation */
588	>	d += (pv[i] - ap->pos[i]) *
589	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
590	>
591	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
592	>	for (i = 3; i--; )
593	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
594	>
595	>	if (d < min_d)                  /* should not use if we can avoid it */
596	>	d = min_d;
597	>	copycolor(cr, ap->val);
598	>	scalecolor(cr, d);
599	>	return(d > min_d);
600	>	}
601	>
602	>
603	>	static void
604	>	avinsert(                               /* insert ambient value in our tree */
605	>	AMBVAL *av
606	>	)
607	>	{
608	>	AMBTREE  *at;
609	>	AMBVAL  *ap;
610	>	AMBVAL  avh;
611	>	FVECT  ck0;
612	>	double  s;
613	>	int  branch;
614	>	int  i;
615	>
616	>	if (av->rad[0] <= FTINY)
617	>	error(CONSISTENCY, "zero ambient radius in avinsert");
618	>	at = &atrunk;
619	>	VCOPY(ck0, thescene.cuorg);
620	>	s = thescene.cusize;
621	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
622	>	if (at->kid == NULL)
623	>	if ((at->kid = newambtree()) == NULL)
624	>	error(SYSTEM, "out of memory in avinsert");
625	>	s *= 0.5;
626	>	branch = 0;
627	>	for (i = 0; i < 3; i++)
628	>	if (av->pos[i] > ck0[i] + s) {
629	>	ck0[i] += s;
630	>	branch |= 1 << i;
631	>	}
632	>	at = at->kid + branch;
633	>	}
634	>	avh.next = at->alist;           /* order by increasing level */
635	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
636	>	if ( ap->next->lvl > av->lvl ||
637	>	(ap->next->lvl == av->lvl) &
638	>	(ap->next->weight <= av->weight) )
639	>	break;
640	>	av->next = ap->next;
641	>	ap->next = (AMBVAL*)av;
642	>	at->alist = avh.next;
643	>	}
644	>
645	>
646	>	#else /* ! NEWAMB */
647	>
648	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
649	>	AMBTREE *at, FVECT c0, double s);
650	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
651	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
652	>
653	>
654	>	void
655	>	multambient(            /* compute ambient component & multiply by coef. */
656	>	COLOR  aval,
657	>	RAY  *r,
658	>	FVECT  nrm
659	>	)
660	>	{
661	>	static int  rdepth = 0;                 /* ambient recursion */
662	>	COLOR   acol, caustic;
663	>	double  d, l;
664	>
665	>	/* PMAP: Factor in ambient from global photon map (if enabled) and return
666	>	* as all ambient components accounted for */
667	>	if (ambPmap(aval, r, rdepth))
668	>	return;
669	>
670	>	/* PMAP: Otherwise factor in ambient from caustic photon map
671	>	* (ambPmapCaustic() returns zero if caustic photons disabled) and
672	>	* continue with RADIANCE ambient calculation */
673	>	copycolor(caustic, aval);
674	>	ambPmapCaustic(caustic, r, rdepth);
675	>
676	>	if (ambdiv <= 0)                        /* no ambient calculation */
677	>	goto dumbamb;
678	>	/* check number of bounces */
679	>	if (rdepth >= ambounce)
680	>	goto dumbamb;
681	>	/* check ambient list */
682	>	if (ambincl != -1 && r->ro != NULL &&
683	>	ambincl != inset(ambset, r->ro->omod))
684	>	goto dumbamb;
685	>
686	>	if (ambacc <= FTINY) {                  /* no ambient storage */
687	>	copycolor(acol, aval);
688	>	rdepth++;
689	>	d = doambient(acol, r, r->rweight, NULL, NULL);
690		rdepth--;
691	+	if (d <= FTINY)
692	+	goto dumbamb;
693	+	copycolor(aval, acol);
694	+
695	+	/* PMAP: add in caustic */
696	+	addcolor(aval, caustic);
697	+	return;
698		}
699	<	if (d > FTINY)
699	>
700	>	if (tracktime)                          /* sort to minimize thrashing */
701	>	sortambvals(0);
702	>	/* interpolate ambient value */
703	>	setcolor(acol, 0.0, 0.0, 0.0);
704	>	d = sumambient(acol, r, nrm, rdepth,
705	>	&atrunk, thescene.cuorg, thescene.cusize);
706	>
707	>	if (d > FTINY) {
708	>	d = 1.0/d;
709	>	scalecolor(acol, d);
710	>	multcolor(aval, acol);
711	>
712	>	/* PMAP: add in caustic */
713	>	addcolor(aval, caustic);
714		return;
715	+	}
716	+
717	+	rdepth++;                               /* need to cache new value */
718	+	d = makeambient(acol, r, nrm, rdepth-1);
719	+	rdepth--;
720	+
721	+	if (d > FTINY) {
722	+	multcolor(aval, acol);          /* got new value */
723	+
724	+	/* PMAP: add in caustic */
725	+	addcolor(aval, caustic);
726	+	return;
727	+	}
728	+
729		dumbamb:                                        /* return global value */
730	<	copycolor(acol, ambval);
730	>	if ((ambvwt <= 0) | (navsum == 0)) {
731	>	multcolor(aval, ambval);
732	>
733	>	/* PMAP: add in caustic */
734	>	addcolor(aval, caustic);
735	>	return;
736	>	}
737	>
738	>	l = bright(ambval);                     /* average in computations */
739	>	if (l > FTINY) {
740	>	d = (log(l)*(double)ambvwt + avsum) /
741	>	(double)(ambvwt + navsum);
742	>	d = exp(d) / l;
743	>	scalecolor(aval, d);
744	>	multcolor(aval, ambval);        /* apply color of ambval */
745	>	} else {
746	>	d = exp( avsum / (double)navsum );
747	>	scalecolor(aval, d);            /* neutral color */
748	>	}
749		}
750
751
752	<	double
753	<	sumambient(acol, r, al, at, c0, s)      /* get interpolated ambient value */
754	<	COLOR  acol;
755	<	register RAY  *r;
756	<	int  al;
757	<	AMBTREE  *at;
758	<	FVECT  c0;
759	<	double  s;
752	>	static double
753	>	sumambient(     /* get interpolated ambient value */
754	>	COLOR  acol,
755	>	RAY  *r,
756	>	FVECT  rn,
757	>	int  al,
758	>	AMBTREE  *at,
759	>	FVECT  c0,
760	>	double  s
761	>	)
762		{
763	<	extern double  sqrt();
163	<	double  d, e1, e2, wt, wsum;
763	>	double  d, e1, e2, wt, wsum;
764		COLOR  ct;
765		FVECT  ck0;
766		int  i;
767	<	register int  j;
768	<	register AMBVAL  *av;
769	<	/* do this node */
767	>	int  j;
768	>	AMBVAL   *av;
769	>
770		wsum = 0.0;
771	+	/* do this node */
772		for (av = at->alist; av != NULL; av = av->next) {
773	+	double  rn_dot = -2.0;
774	+	if (tracktime)
775	+	av->latick = ambclock;
776		/*
777		*  Ambient level test.
778		*/
779	<	if (av->lvl > al || av->weight < r->rweight-FTINY)
780	<	continue;
779	>	if (av->lvl > al ||     /* list sorted, so this works */
780	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
781	>	break;
782		/*
783		*  Ambient radius test.
784		*/
785	<	e1 = 0.0;
786	<	for (j = 0; j < 3; j++) {
182	<	d = av->pos[j] - r->rop[j];
183	<	e1 += d * d;
184	<	}
185	<	e1 /= av->rad * av->rad;
785	>	VSUB(ck0, av->pos, r->rop);
786	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
787		if (e1 > ambacc*ambacc*1.21)
788		continue;
789		/*
790	<	*  Normal direction test.
790	>	*  Direction test using closest normal.
791		*/
792	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
793	<	if (e2 < 0.0) e2 = 0.0;
794	<	if (e1 + e2 > ambacc*ambacc*1.21)
792	>	d = DOT(av->dir, r->ron);
793	>	if (rn != r->ron) {
794	>	rn_dot = DOT(av->dir, rn);
795	>	if (rn_dot > 1.0-FTINY)
796	>	rn_dot = 1.0-FTINY;
797	>	if (rn_dot >= d-FTINY) {
798	>	d = rn_dot;
799	>	rn_dot = -2.0;
800	>	}
801	>	}
802	>	e2 = (1.0 - d) * r->rweight;
803	>	if (e2 < 0.0)
804	>	e2 = 0.0;
805	>	else if (e1 + e2 > ambacc*ambacc*1.21)
806		continue;
807		/*
808		*  Ray behind test.
#	Line 204 | Line 816 | double  s;
816		/*
817		*  Jittering final test reduces image artifacts.
818		*/
819	<	wt = sqrt(e1) + sqrt(e2);
820	<	wt *= .9 + .2*urand(9015+samplendx);
821	<	if (wt > ambacc)
819	>	e1 = sqrt(e1);
820	>	e2 = sqrt(e2);
821	>	wt = e1 + e2;
822	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
823		continue;
824	+	/*
825	+	*  Recompute directional error using perturbed normal
826	+	*/
827	+	if (rn_dot > 0.0) {
828	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
829	+	wt = e1 + e2;
830	+	}
831		if (wt <= 1e-3)
832		wt = 1e3;
833		else
834		wt = 1.0 / wt;
835		wsum += wt;
836	<	extambient(ct, av, r->rop, r->ron);
836	>	extambient(ct, av, r->rop, rn);
837		scalecolor(ct, wt);
838		addcolor(acol, ct);
839		}
#	Line 232 | Line 852 | double  s;
852		break;
853		}
854		if (j == 3)
855	<	wsum += sumambient(acol, r, al, at->kid+i, ck0, s);
855	>	wsum += sumambient(acol, r, rn, al,
856	>	at->kid+i, ck0, s);
857		}
858		return(wsum);
859		}
860
861
862	<	double
863	<	makeambient(acol, r, al)        /* make a new ambient value */
864	<	COLOR  acol;
865	<	register RAY  *r;
866	<	int  al;
862	>	static double
863	>	makeambient(            /* make a new ambient value for storage */
864	>	COLOR  acol,
865	>	RAY  *r,
866	>	FVECT  rn,
867	>	int  al
868	>	)
869		{
870	<	AMBVAL  amb;
870	>	AMBVAL  amb;
871		FVECT   gp, gd;
872	<	/* compute weight */
873	<	amb.weight = pow(AVGREFL, (double)al);
874	<	if (r->rweight < 0.2*amb.weight)        /* heuristic */
875	<	amb.weight = r->rweight;
872	>	int     i;
873	>
874	>	amb.weight = 1.0;                       /* compute weight */
875	>	for (i = al; i-- > 0; )
876	>	amb.weight *= AVGREFL;
877	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
878	>	amb.weight = 1.25*r->rweight;
879	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
880		/* compute ambient */
881		amb.rad = doambient(acol, r, amb.weight, gp, gd);
882	<	if (amb.rad == 0.0)
882	>	if (amb.rad <= FTINY) {
883	>	setcolor(acol, 0.0, 0.0, 0.0);
884		return(0.0);
885	<	/* store it */
885	>	}
886	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
887	>	/* store value */
888		VCOPY(amb.pos, r->rop);
889		VCOPY(amb.dir, r->ron);
890		amb.lvl = al;
#	Line 262 | Line 892 | int  al;
892		VCOPY(amb.gpos, gp);
893		VCOPY(amb.gdir, gd);
894		/* insert into tree */
895	<	avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize);
896	<	avsave(&amb);                           /* write to file */
895	>	avsave(&amb);                           /* and save to file */
896	>	if (rn != r->ron)
897	>	extambient(acol, &amb, r->rop, rn);     /* texture */
898		return(amb.rad);
899		}
900
901
902	<	extambient(cr, ap, pv, nv)              /* extrapolate value at pv, nv */
903	<	COLOR  cr;
904	<	register AMBVAL  *ap;
905	<	FVECT  pv, nv;
902	>	static void
903	>	extambient(             /* extrapolate value at pv, nv */
904	>	COLOR  cr,
905	>	AMBVAL   *ap,
906	>	FVECT  pv,
907	>	FVECT  nv
908	>	)
909		{
910	<	FVECT  v1, v2;
911	<	register int  i;
912	<	double  d;
910	>	FVECT  v1;
911	>	int  i;
912	>	double  d;
913
914		d = 1.0;                        /* zeroeth order */
915		/* gradient due to translation */
916		for (i = 0; i < 3; i++)
917		d += ap->gpos[i]*(pv[i]-ap->pos[i]);
918		/* gradient due to rotation */
919	<	VCOPY(v1, ap->dir);
920	<	fcross(v2, v1, nv);
287	<	d += DOT(ap->gdir, v2);
919	>	VCROSS(v1, ap->dir, nv);
920	>	d += DOT(ap->gdir, v1);
921		if (d <= 0.0) {
922		setcolor(cr, 0.0, 0.0, 0.0);
923		return;
#	Line 294 | Line 927 | FVECT  pv, nv;
927		}
928
929
930	<	static
931	<	avsave(av)                              /* save an ambient value */
932	<	AMBVAL  *av;
930	>	static void
931	>	avinsert(                               /* insert ambient value in our tree */
932	>	AMBVAL *av
933	>	)
934		{
935	<	#ifdef  AMBFLUSH
936	<	static int  nunflshed = 0;
937	<	#endif
304	<	if (ambfp == NULL)
305	<	return;
306	<	if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1)
307	<	goto writerr;
308	<	#ifdef  AMBFLUSH
309	<	if (++nunflshed >= AMBFLUSH) {
310	<	if (fflush(ambfp) == EOF)
311	<	goto writerr;
312	<	nunflshed = 0;
313	<	}
314	<	#endif
315	<	return;
316	<	writerr:
317	<	error(SYSTEM, "error writing ambient file");
318	<	}
319	<
320	<
321	<	static
322	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
323	<	AMBVAL  *aval;
324	<	register AMBTREE  *at;
325	<	FVECT  c0;
326	<	double  s;
327	<	{
935	>	AMBTREE  *at;
936	>	AMBVAL  *ap;
937	>	AMBVAL  avh;
938		FVECT  ck0;
939	+	double  s;
940		int  branch;
941	<	register AMBVAL  *av;
331	<	register int  i;
941	>	int  i;
942
943	<	if ((av = newambval()) == NULL)
944	<	goto memerr;
945	<	copystruct(av, aval);
946	<	VCOPY(ck0, c0);
943	>	if (av->rad <= FTINY)
944	>	error(CONSISTENCY, "zero ambient radius in avinsert");
945	>	at = &atrunk;
946	>	VCOPY(ck0, thescene.cuorg);
947	>	s = thescene.cusize;
948		while (s*(OCTSCALE/2) > av->rad*ambacc) {
949		if (at->kid == NULL)
950		if ((at->kid = newambtree()) == NULL)
951	<	goto memerr;
951	>	error(SYSTEM, "out of memory in avinsert");
952		s *= 0.5;
953		branch = 0;
954		for (i = 0; i < 3; i++)
#	Line 347 | Line 958 | double  s;
958		}
959		at = at->kid + branch;
960		}
961	<	av->next = at->alist;
962	<	at->alist = av;
961	>	avh.next = at->alist;           /* order by increasing level */
962	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
963	>	if ( ap->next->lvl > av->lvl ||
964	>	(ap->next->lvl == av->lvl) &
965	>	(ap->next->weight <= av->weight) )
966	>	break;
967	>	av->next = ap->next;
968	>	ap->next = (AMBVAL*)av;
969	>	at->alist = avh.next;
970	>	}
971	>
972	>	#endif  /* ! NEWAMB */
973	>
974	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
975	>
976	>	static void
977	>	initambfile(            /* initialize ambient file */
978	>	int  cre8
979	>	)
980	>	{
981	>	extern char  *progname, *octname;
982	>	static char  *mybuf = NULL;
983	>
984	>	#ifdef  F_SETLKW
985	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
986	>	#endif
987	>	SET_FILE_BINARY(ambfp);
988	>	if (mybuf == NULL)
989	>	mybuf = (char *)bmalloc(BUFSIZ+8);
990	>	setbuf(ambfp, mybuf);
991	>	if (cre8) {                     /* new file */
992	>	newheader("RADIANCE", ambfp);
993	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
994	>	progname, colval(ambval,RED),
995	>	colval(ambval,GRN), colval(ambval,BLU),
996	>	ambvwt, ambounce, ambacc);
997	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
998	>	ambdiv, ambssamp, ambres);
999	>	if (octname != NULL)
1000	>	fputs(octname, ambfp);
1001	>	fputc('\n', ambfp);
1002	>	fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1003	>	fputnow(ambfp);
1004	>	fputformat(AMBFMT, ambfp);
1005	>	fputc('\n', ambfp);
1006	>	putambmagic(ambfp);
1007	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
1008	>	error(USER, "bad ambient file");
1009	>	}
1010	>
1011	>
1012	>	static void
1013	>	avsave(                         /* insert and save an ambient value */
1014	>	AMBVAL  *av
1015	>	)
1016	>	{
1017	>	avstore(av);
1018	>	if (ambfp == NULL)
1019	>	return;
1020	>	if (writambval(av, ambfp) < 0)
1021	>	goto writerr;
1022	>	if (++nunflshed >= AMBFLUSH)
1023	>	if (ambsync() == EOF)
1024	>	goto writerr;
1025		return;
1026	<	memerr:
1027	<	error(SYSTEM, "out of memory in avinsert");
1026	>	writerr:
1027	>	error(SYSTEM, "error writing to ambient file");
1028		}
1029	+
1030	+
1031	+	static AMBVAL *
1032	+	avstore(                                /* allocate memory and save aval */
1033	+	AMBVAL  *aval
1034	+	)
1035	+	{
1036	+	AMBVAL  *av;
1037	+	double  d;
1038	+
1039	+	if ((av = newambval()) == NULL)
1040	+	error(SYSTEM, "out of memory in avstore");
1041	+	*av = *aval;
1042	+	av->latick = ambclock;
1043	+	av->next = NULL;
1044	+	nambvals++;
1045	+	d = bright(av->val);
1046	+	if (d > FTINY) {                /* add to log sum for averaging */
1047	+	avsum += log(d);
1048	+	navsum++;
1049	+	}
1050	+	avinsert(av);                   /* insert in our cache tree */
1051	+	return(av);
1052	+	}
1053	+
1054	+
1055	+	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
1056	+
1057	+	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
1058	+
1059	+
1060	+	static AMBTREE *
1061	+	newambtree(void)                                /* allocate 8 ambient tree structs */
1062	+	{
1063	+	AMBTREE  *atp, *upperlim;
1064	+
1065	+	if (atfreelist == NULL) {       /* get more nodes */
1066	+	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
1067	+	if (atfreelist == NULL)
1068	+	return(NULL);
1069	+	/* link new free list */
1070	+	upperlim = atfreelist + 8*(ATALLOCSZ-1);
1071	+	for (atp = atfreelist; atp < upperlim; atp += 8)
1072	+	atp->kid = atp + 8;
1073	+	atp->kid = NULL;
1074	+	}
1075	+	atp = atfreelist;
1076	+	atfreelist = atp->kid;
1077	+	memset((char *)atp, '\0', 8*sizeof(AMBTREE));
1078	+	return(atp);
1079	+	}
1080	+
1081	+
1082	+	static void
1083	+	freeambtree(                    /* free 8 ambient tree structs */
1084	+	AMBTREE  *atp
1085	+	)
1086	+	{
1087	+	atp->kid = atfreelist;
1088	+	atfreelist = atp;
1089	+	}
1090	+
1091	+
1092	+	static void
1093	+	unloadatree(                    /* unload an ambient value tree */
1094	+	AMBTREE  *at,
1095	+	unloadtf_t *f
1096	+	)
1097	+	{
1098	+	AMBVAL  *av;
1099	+	int  i;
1100	+	/* transfer values at this node */
1101	+	for (av = at->alist; av != NULL; av = at->alist) {
1102	+	at->alist = av->next;
1103	+	(*f)(av);
1104	+	}
1105	+	if (at->kid == NULL)
1106	+	return;
1107	+	for (i = 0; i < 8; i++)         /* transfer and free children */
1108	+	unloadatree(at->kid+i, f);
1109	+	freeambtree(at->kid);
1110	+	at->kid = NULL;
1111	+	}
1112	+
1113	+
1114	+	static struct avl {
1115	+	AMBVAL  *p;
1116	+	unsigned long   t;
1117	+	}       *avlist1;                       /* ambient value list with ticks */
1118	+	static AMBVAL   **avlist2;              /* memory positions for sorting */
1119	+	static int      i_avlist;               /* index for lists */
1120	+
1121	+	static int alatcmp(const void *av1, const void *av2);
1122	+
1123	+	static void
1124	+	avfree(AMBVAL *av)
1125	+	{
1126	+	free(av);
1127	+	}
1128	+
1129	+	static void
1130	+	av2list(
1131	+	AMBVAL *av
1132	+	)
1133	+	{
1134	+	#ifdef DEBUG
1135	+	if (i_avlist >= nambvals)
1136	+	error(CONSISTENCY, "too many ambient values in av2list1");
1137	+	#endif
1138	+	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1139	+	avlist1[i_avlist++].t = av->latick;
1140	+	}
1141	+
1142	+
1143	+	static int
1144	+	alatcmp(                        /* compare ambient values for MRA */
1145	+	const void *av1,
1146	+	const void *av2
1147	+	)
1148	+	{
1149	+	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1150	+	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1151	+	}
1152	+
1153	+
1154	+	/* GW NOTE 2002/10/3:
1155	+	* I used to compare AMBVAL pointers, but found that this was the
1156	+	* cause of a serious consistency error with gcc, since the optimizer
1157	+	* uses some dangerous trick in pointer subtraction that
1158	+	* assumes pointers differ by exact struct size increments.
1159	+	*/
1160	+	static int
1161	+	aposcmp(                        /* compare ambient value positions */
1162	+	const void      *avp1,
1163	+	const void      *avp2
1164	+	)
1165	+	{
1166	+	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1167	+	if (diff < 0)
1168	+	return(-1);
1169	+	return(diff > 0);
1170	+	}
1171	+
1172	+
1173	+	static int
1174	+	avlmemi(                                /* find list position from address */
1175	+	AMBVAL  *avaddr
1176	+	)
1177	+	{
1178	+	AMBVAL  **avlpp;
1179	+
1180	+	avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2,
1181	+	nambvals, sizeof(AMBVAL *), &aposcmp);
1182	+	if (avlpp == NULL)
1183	+	error(CONSISTENCY, "address not found in avlmemi");
1184	+	return(avlpp - avlist2);
1185	+	}
1186	+
1187	+
1188	+	static void
1189	+	sortambvals(                    /* resort ambient values */
1190	+	int     always
1191	+	)
1192	+	{
1193	+	AMBTREE  oldatrunk;
1194	+	AMBVAL  tav, *tap, *pnext;
1195	+	int     i, j;
1196	+	/* see if it's time yet */
1197	+	if (!always && (ambclock++ < lastsort+sortintvl ||
1198	+	nambvals < SORT_THRESH))
1199	+	return;
1200	+	/*
1201	+	* The idea here is to minimize memory thrashing
1202	+	* in VM systems by improving reference locality.
1203	+	* We do this by periodically sorting our stored ambient
1204	+	* values in memory in order of most recently to least
1205	+	* recently accessed.  This ordering was chosen so that new
1206	+	* ambient values (which tend to be less important) go into
1207	+	* higher memory with the infrequently accessed values.
1208	+	*      Since we expect our values to need sorting less
1209	+	* frequently as the process continues, we double our
1210	+	* waiting interval after each call.
1211	+	*      This routine is also called by setambacc() with
1212	+	* the "always" parameter set to 1 so that the ambient
1213	+	* tree will be rebuilt with the new accuracy parameter.
1214	+	*/
1215	+	if (tracktime) {                /* allocate pointer arrays to sort */
1216	+	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1217	+	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1218	+	} else {
1219	+	avlist2 = NULL;
1220	+	avlist1 = NULL;
1221	+	}
1222	+	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1223	+	if (avlist2 != NULL)
1224	+	free((void *)avlist2);
1225	+	if (always) {           /* rebuild without sorting */
1226	+	oldatrunk = atrunk;
1227	+	atrunk.alist = NULL;
1228	+	atrunk.kid = NULL;
1229	+	unloadatree(&oldatrunk, &avinsert);
1230	+	}
1231	+	} else {                        /* sort memory by last access time */
1232	+	/*
1233	+	* Sorting memory is tricky because it isn't contiguous.
1234	+	* We have to sort an array of pointers by MRA and also
1235	+	* by memory position.  We then copy values in "loops"
1236	+	* to minimize memory hits.  Nevertheless, we will visit
1237	+	* everyone at least twice, and this is an expensive process
1238	+	* when we're thrashing, which is when we need to do it.
1239	+	*/
1240	+	#ifdef DEBUG
1241	+	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1242	+	nambvals, ambclock);
1243	+	eputs(errmsg);
1244	+	#endif
1245	+	i_avlist = 0;
1246	+	unloadatree(&atrunk, &av2list); /* empty current tree */
1247	+	#ifdef DEBUG
1248	+	if (i_avlist < nambvals)
1249	+	error(CONSISTENCY, "missing ambient values in sortambvals");
1250	+	#endif
1251	+	qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp);
1252	+	qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1253	+	for (i = 0; i < nambvals; i++) {
1254	+	if (avlist1[i].p == NULL)
1255	+	continue;
1256	+	tap = avlist2[i];
1257	+	tav = *tap;
1258	+	for (j = i; (pnext = avlist1[j].p) != tap;
1259	+	j = avlmemi(pnext)) {
1260	+	*(avlist2[j]) = *pnext;
1261	+	avinsert(avlist2[j]);
1262	+	avlist1[j].p = NULL;
1263	+	}
1264	+	*(avlist2[j]) = tav;
1265	+	avinsert(avlist2[j]);
1266	+	avlist1[j].p = NULL;
1267	+	}
1268	+	free((void *)avlist1);
1269	+	free((void *)avlist2);
1270	+	/* compute new sort interval */
1271	+	sortintvl = ambclock - lastsort;
1272	+	if (sortintvl >= MAX_SORT_INTVL/2)
1273	+	sortintvl = MAX_SORT_INTVL;
1274	+	else
1275	+	sortintvl <<= 1;        /* wait twice as long next */
1276	+	#ifdef DEBUG
1277	+	eputs("done\n");
1278	+	#endif
1279	+	}
1280	+	if (ambclock >= MAXACLOCK)
1281	+	ambclock = MAXACLOCK/2;
1282	+	lastsort = ambclock;
1283	+	}
1284	+
1285	+
1286	+	#ifdef  F_SETLKW
1287	+
1288	+	static void
1289	+	aflock(                 /* lock/unlock ambient file */
1290	+	int  typ
1291	+	)
1292	+	{
1293	+	static struct flock  fls;       /* static so initialized to zeroes */
1294	+
1295	+	if (typ == fls.l_type)          /* already called? */
1296	+	return;
1297	+	fls.l_type = typ;
1298	+	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1299	+	error(SYSTEM, "cannot (un)lock ambient file");
1300	+	}
1301	+
1302	+
1303	+	int
1304	+	ambsync(void)                   /* synchronize ambient file */
1305	+	{
1306	+	long  flen;
1307	+	AMBVAL  avs;
1308	+	int  n;
1309	+
1310	+	if (ambfp == NULL)      /* no ambient file? */
1311	+	return(0);
1312	+	/* gain appropriate access */
1313	+	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1314	+	/* see if file has grown */
1315	+	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1316	+	goto seekerr;
1317	+	if ((n = flen - lastpos) > 0) {         /* file has grown */
1318	+	if (ambinp == NULL) {           /* use duplicate filedes */
1319	+	ambinp = fdopen(dup(fileno(ambfp)), "r");
1320	+	if (ambinp == NULL)
1321	+	error(SYSTEM, "fdopen failed in ambsync");
1322	+	}
1323	+	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1324	+	goto seekerr;
1325	+	while (n >= AMBVALSIZ) {        /* load contributed values */
1326	+	if (!readambval(&avs, ambinp)) {
1327	+	sprintf(errmsg,
1328	+	"ambient file \"%s\" corrupted near character %ld",
1329	+	ambfile, flen - n);
1330	+	error(WARNING, errmsg);
1331	+	break;
1332	+	}
1333	+	avstore(&avs);
1334	+	n -= AMBVALSIZ;
1335	+	}
1336	+	lastpos = flen - n;
1337	+	/*** seek always as safety measure
1338	+	if (n) ***/                     /* alignment */
1339	+	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1340	+	goto seekerr;
1341	+	}
1342	+	n = fflush(ambfp);                      /* calls write() at last */
1343	+	if (n != EOF)
1344	+	lastpos += (long)nunflshed*AMBVALSIZ;
1345	+	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1346	+	goto seekerr;
1347	+
1348	+	aflock(F_UNLCK);                        /* release file */
1349	+	nunflshed = 0;
1350	+	return(n);
1351	+	seekerr:
1352	+	error(SYSTEM, "seek failed in ambsync");
1353	+	return -1; /* pro forma return */
1354	+	}
1355	+
1356	+	#else   /* ! F_SETLKW */
1357	+
1358	+	int
1359	+	ambsync(void)                   /* flush ambient file */
1360	+	{
1361	+	if (ambfp == NULL)
1362	+	return(0);
1363	+	nunflshed = 0;
1364	+	return(fflush(ambfp));
1365	+	}
1366	+
1367	+	#endif  /* ! F_SETLKW */

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