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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 2.104 by greg, Fri Jan 27 22:00:49 2017 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	>
80	>	static void initambfile(int creat);
81	>	static void avsave(AMBVAL *av);
82	>	static AMBVAL *avstore(AMBVAL  *aval);
83	>	static AMBTREE *newambtree(void);
84	>	static void freeambtree(AMBTREE  *atp);
85	>
86	>	typedef void unloadtf_t(AMBVAL *);
87	>	static unloadtf_t avinsert;
88	>	static unloadtf_t av2list;
89	>	static unloadtf_t avfree;
90	>	static void unloadatree(AMBTREE  *at, unloadtf_t *f);
91	>
92	>	static int aposcmp(const void *avp1, const void *avp2);
93	>	static int avlmemi(AMBVAL *avaddr);
94	>	static void sortambvals(int always);
95	>
96	>	#ifdef  F_SETLKW
97	>	static void aflock(int  typ);
98	>	#endif
99	>
100	>
101	>	void
102	>	setambres(                              /* set ambient resolution */
103	>	int  ar
104	>	)
105		{
106	+	ambres = ar < 0 ? 0 : ar;               /* may be done already */
107		/* set min & max radii */
108		if (ar <= 0) {
109	<	minarad = 0.0;
110	<	maxarad = thescene.cusize / 2.0;
109	>	minarad = 0;
110	>	maxarad = thescene.cusize*0.2;
111		} else {
112		minarad = thescene.cusize / ar;
113	<	maxarad = 16.0 * minarad;               /* heuristic */
114	<	if (maxarad > thescene.cusize / 2.0)
115	<	maxarad = thescene.cusize / 2.0;
113	>	maxarad = 64.0 * minarad;               /* heuristic */
114	>	if (maxarad > thescene.cusize*0.2)
115	>	maxarad = thescene.cusize*0.2;
116		}
117	<	if (maxarad <= FTINY)
118	<	maxarad = .001;
117	>	if (minarad <= FTINY)
118	>	minarad = 10.0*FTINY;
119	>	if (maxarad <= minarad)
120	>	maxarad = 64.0 * minarad;
121		}
122
123
124	<	setambient(afile)                       /* initialize calculation */
125	<	char  *afile;
124	>	void
125	>	setambacc(                              /* set ambient accuracy */
126	>	double  newa
127	>	)
128		{
129	<	extern long  ftell();
130	<	AMBVAL  amb;
129	>	static double   olda;           /* remember previous setting here */
130	>
131	>	newa *= (newa > 0);
132	>	if (fabs(newa - olda) >= .05*(newa + olda)) {
133	>	ambacc = newa;
134	>	if (nambvals > 0)
135	>	sortambvals(1);         /* rebuild tree */
136	>	}
137	>	}
138	>
139	>
140	>	void
141	>	setambient(void)                                /* initialize calculation */
142	>	{
143	>	int     readonly = 0;
144	>	long    flen;
145	>	AMBVAL  amb;
146	>	/* make sure we're fresh */
147	>	ambdone();
148		/* init ambient limits */
149		setambres(ambres);
150	+	setambacc(ambacc);
151	+	if (ambfile == NULL || !ambfile[0])
152	+	return;
153	+	if (ambacc <= FTINY) {
154	+	sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
155	+	ambfile);
156	+	error(WARNING, errmsg);
157	+	return;
158	+	}
159		/* open ambient file */
160	<	if (afile != NULL)
161	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
162	<	initambfile(0);
163	<	while (readambval(&amb, ambfp))
164	<	avinsert(&amb, &atrunk, thescene.cuorg,
165	<	thescene.cusize);
166	<	/* align */
167	<	fseek(ambfp, -((ftell(ambfp)-ambheadlen)%AMBVALSIZ), 1);
168	<	} else if ((ambfp = fopen(afile, "w")) != NULL)
169	<	initambfile(1);
170	<	else {
171	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
172	<	afile);
173	<	error(SYSTEM, errmsg);
160	>	if ((ambfp = fopen(ambfile, "r+")) == NULL)
161	>	readonly = (ambfp = fopen(ambfile, "r")) != NULL;
162	>	if (ambfp != NULL) {
163	>	initambfile(0);                 /* file exists */
164	>	lastpos = ftell(ambfp);
165	>	while (readambval(&amb, ambfp))
166	>	avstore(&amb);
167	>	nambshare = nambvals;           /* share loaded values */
168	>	if (readonly) {
169	>	sprintf(errmsg,
170	>	"loaded %u values from read-only ambient file",
171	>	nambvals);
172	>	error(WARNING, errmsg);
173	>	fclose(ambfp);          /* close file so no writes */
174	>	ambfp = NULL;
175	>	return;                 /* avoid ambsync() */
176		}
177	+	/* align file pointer */
178	+	lastpos += (long)nambvals*AMBVALSIZ;
179	+	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
180	+	if (flen != lastpos) {
181	+	sprintf(errmsg,
182	+	"ignoring last %ld values in ambient file (corrupted)",
183	+	(flen - lastpos)/AMBVALSIZ);
184	+	error(WARNING, errmsg);
185	+	fseek(ambfp, lastpos, SEEK_SET);
186	+	ftruncate(fileno(ambfp), (off_t)lastpos);
187	+	}
188	+	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
189	+	initambfile(1);                 /* else create new file */
190	+	fflush(ambfp);
191	+	lastpos = ftell(ambfp);
192	+	} else {
193	+	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
194	+	error(SYSTEM, errmsg);
195	+	}
196	+	#ifdef  F_SETLKW
197	+	aflock(F_UNLCK);                        /* release file */
198	+	#endif
199		}
200
201
202	<	initambfile(creat)              /* initialize ambient file */
203	<	int  creat;
202	>	void
203	>	ambdone(void)                   /* close ambient file and free memory */
204		{
205	<	extern char  *progname, *octname;
206	<
207	<	setbuf(ambfp, bmalloc(BUFSIZ));
208	<	if (creat) {                    /* new file */
209	<	fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ",
210	<	progname, colval(ambval,RED),
211	<	colval(ambval,GRN), colval(ambval,BLU),
212	<	ambounce, ambacc);
213	<	fprintf(ambfp, "-ad %d -as %d -ar %d %s\n",
214	<	ambdiv, ambssamp, ambres,
215	<	octname==NULL ? "" : octname);
216	<	fputformat(AMBFMT, ambfp);
217	<	putc('\n', ambfp);
218	<	putambmagic(ambfp);
219	<	fflush(ambfp);
220	<	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
221	<	error(USER, "ambient file format error");
222	<	ambheadlen = ftell(ambfp);
205	>	if (ambfp != NULL) {            /* close ambient file */
206	>	ambsync();
207	>	fclose(ambfp);
208	>	ambfp = NULL;
209	>	if (ambinp != NULL) {
210	>	fclose(ambinp);
211	>	ambinp = NULL;
212	>	}
213	>	lastpos = -1;
214	>	}
215	>	/* free ambient tree */
216	>	unloadatree(&atrunk, avfree);
217	>	/* reset state variables */
218	>	avsum = 0.;
219	>	navsum = 0;
220	>	nambvals = 0;
221	>	nambshare = 0;
222	>	ambclock = 0;
223	>	lastsort = 0;
224	>	sortintvl = SORT_INTVL;
225		}
226
227
228	<	ambnotify(obj)                  /* record new modifier */
229	<	OBJECT  obj;
228	>	void
229	>	ambnotify(                      /* record new modifier */
230	>	OBJECT  obj
231	>	)
232		{
233		static int  hitlimit = 0;
234	<	register OBJREC  *o = objptr(obj);
235	<	register char  **amblp;
234	>	OBJREC   *o;
235	>	char  **amblp;
236
237	+	if (obj == OVOID) {             /* starting over */
238	+	ambset[0] = 0;
239	+	hitlimit = 0;
240	+	return;
241	+	}
242	+	o = objptr(obj);
243		if (hitlimit || !ismodifier(o->otype))
244		return;
245		for (amblp = amblist; *amblp != NULL; amblp++)
#	Line 139 | Line 254 | OBJECT  obj;
254		}
255		}
256
257	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
258
259	<	ambient(acol, r)                /* compute ambient component for ray */
260	<	COLOR  acol;
261	<	register RAY  *r;
259	>	#ifndef OLDAMB
260	>
261	>	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
262	>
263	>	static int      plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang);
264	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
265	>	AMBTREE *at, FVECT c0, double s);
266	>	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
267	>	static int      extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
268	>	FVECT uvw[3]);
269	>
270	>	void
271	>	multambient(            /* compute ambient component & multiply by coef. */
272	>	COLOR  aval,
273	>	RAY  *r,
274	>	FVECT  nrm
275	>	)
276		{
277		static int  rdepth = 0;                 /* ambient recursion */
278	<	double  d;
278	>	COLOR   acol, caustic;
279	>	int     i, ok;
280	>	double  d, l;
281
282	+	/* PMAP: Factor in ambient from photon map, if enabled and ray is
283	+	* ambient. Return as all ambient components accounted for, else
284	+	* continue. */
285	+	if (ambPmap(aval, r, rdepth))
286	+	return;
287	+
288	+	/* PMAP: Factor in specular-diffuse ambient (caustics) from photon
289	+	* map, if enabled and ray is primary, else caustic is zero.  Continue
290	+	* with RADIANCE ambient calculation */
291	+	copycolor(caustic, aval);
292	+	ambPmapCaustic(caustic, r, rdepth);
293	+
294		if (ambdiv <= 0)                        /* no ambient calculation */
295		goto dumbamb;
296		/* check number of bounces */
#	Line 158 | Line 302 | register RAY  *r;
302		goto dumbamb;
303
304		if (ambacc <= FTINY) {                  /* no ambient storage */
305	+	FVECT   uvd[2];
306	+	float   dgrad[2], *dgp = NULL;
307	+
308	+	if (nrm != r->ron && DOT(nrm,r->ron) < 0.9999)
309	+	dgp = dgrad;            /* compute rotational grad. */
310	+	copycolor(acol, aval);
311		rdepth++;
312	<	d = doambient(acol, r, r->rweight, NULL, NULL);
312	>	ok = doambient(acol, r, r->rweight,
313	>	uvd, NULL, NULL, dgp, NULL);
314		rdepth--;
315	<	if (d == 0.0)
315	>	if (!ok)
316		goto dumbamb;
317	+	if ((ok > 0) & (dgp != NULL)) { /* apply texture */
318	+	FVECT   v1;
319	+	VCROSS(v1, r->ron, nrm);
320	+	d = 1.0;
321	+	for (i = 3; i--; )
322	+	d += v1[i] * (dgp[0]*uvd[0][i] + dgp[1]*uvd[1][i]);
323	+	if (d >= 0.05)
324	+	scalecolor(acol, d);
325	+	}
326	+	copycolor(aval, acol);
327	+
328	+	/* PMAP: add in caustic */
329	+	addcolor(aval, caustic);
330		return;
331		}
332	<	/* get ambient value */
332	>
333	>	if (tracktime)                          /* sort to minimize thrashing */
334	>	sortambvals(0);
335	>	/* interpolate ambient value */
336		setcolor(acol, 0.0, 0.0, 0.0);
337	<	d = sumambient(acol, r, rdepth,
337	>	d = sumambient(acol, r, nrm, rdepth,
338		&atrunk, thescene.cuorg, thescene.cusize);
339	<	if (d > FTINY)
340	<	scalecolor(acol, 1.0/d);
341	<	else {
342	<	d = makeambient(acol, r, rdepth++);
339	>
340	>	if (d > FTINY) {
341	>	d = 1.0/d;
342	>	scalecolor(acol, d);
343	>	multcolor(aval, acol);
344	>
345	>	/* PMAP: add in caustic */
346	>	addcolor(aval, caustic);
347	>	return;
348	>	}
349	>
350	>	rdepth++;                               /* need to cache new value */
351	>	ok = makeambient(acol, r, nrm, rdepth-1);
352	>	rdepth--;
353	>
354	>	if (ok) {
355	>	multcolor(aval, acol);          /* computed new value */
356	>
357	>	/* PMAP: add in caustic */
358	>	addcolor(aval, caustic);
359	>	return;
360	>	}
361	>
362	>	dumbamb:                                        /* return global value */
363	>	if ((ambvwt <= 0) | (navsum == 0)) {
364	>	multcolor(aval, ambval);
365	>
366	>	/* PMAP: add in caustic */
367	>	addcolor(aval, caustic);
368	>	return;
369	>	}
370	>
371	>	l = bright(ambval);                     /* average in computations */
372	>	if (l > FTINY) {
373	>	d = (log(l)*(double)ambvwt + avsum) /
374	>	(double)(ambvwt + navsum);
375	>	d = exp(d) / l;
376	>	scalecolor(aval, d);
377	>	multcolor(aval, ambval);        /* apply color of ambval */
378	>	} else {
379	>	d = exp( avsum / (double)navsum );
380	>	scalecolor(aval, d);            /* neutral color */
381	>	}
382	>	}
383	>
384	>
385	>	/* Plug a potential leak where ambient cache value is occluded */
386	>	static int
387	>	plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
388	>	{
389	>	const double    cost70sq = 0.1169778;   /* cos(70deg)^2 */
390	>	RAY             rtst;
391	>	FVECT           vdif;
392	>	double          normdot, ndotd, nadotd;
393	>	double          a, b, c, t[2];
394	>
395	>	ang += 2.*PI*(ang < 0);                 /* check direction flags */
396	>	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
397	>	return(0);
398	>	/*
399	>	* Generate test ray, targeting 20 degrees above sample point plane
400	>	* along surface normal from cache position.  This should be high
401	>	* enough to miss local geometry we don't really care about.
402	>	*/
403	>	VSUB(vdif, ap->pos, r->rop);
404	>	normdot = DOT(anorm, r->ron);
405	>	ndotd = DOT(vdif, r->ron);
406	>	nadotd = DOT(vdif, anorm);
407	>	a = normdot*normdot - cost70sq;
408	>	b = 2.0*(normdot*ndotd - nadotd*cost70sq);
409	>	c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq;
410	>	if (quadratic(t, a, b, c) != 2)
411	>	return(1);                      /* should rarely happen */
412	>	if (t[1] <= FTINY)
413	>	return(0);                      /* should fail behind test */
414	>	rayorigin(&rtst, SHADOW, r, NULL);
415	>	VSUM(rtst.rdir, vdif, anorm, t[1]);     /* further dist. > plane */
416	>	rtst.rmax = normalize(rtst.rdir);       /* short ray test */
417	>	while (localhit(&rtst, &thescene)) {    /* check for occluder */
418	>	if (rtst.ro->omod != OVOID &&
419	>	(rtst.clipset == NULL ||
420	>	!inset(rtst.clipset, rtst.ro->omod)))
421	>	return(1);              /* plug light leak */
422	>	VCOPY(rtst.rorg, rtst.rop);     /* skip invisible surface */
423	>	rtst.rmax -= rtst.rot;
424	>	rayclear(&rtst);
425	>	}
426	>	return(0);                              /* seems we're OK */
427	>	}
428	>
429	>
430	>	static double
431	>	sumambient(             /* get interpolated ambient value */
432	>	COLOR  acol,
433	>	RAY  *r,
434	>	FVECT  rn,
435	>	int  al,
436	>	AMBTREE  *at,
437	>	FVECT  c0,
438	>	double  s
439	>	)
440	>	{                       /* initial limit is 10 degrees plus ambacc radians */
441	>	const double    minangle = 10.0 * PI/180.;
442	>	double          maxangle = minangle + ambacc;
443	>	double          wsum = 0.0;
444	>	FVECT           ck0;
445	>	int             i, j;
446	>	AMBVAL          *av;
447	>
448	>	if (at->kid != NULL) {          /* sum children first */
449	>	s *= 0.5;
450	>	for (i = 0; i < 8; i++) {
451	>	for (j = 0; j < 3; j++) {
452	>	ck0[j] = c0[j];
453	>	if (1<<j & i)
454	>	ck0[j] += s;
455	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
456	>	break;
457	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
458	>	break;
459	>	}
460	>	if (j == 3)
461	>	wsum += sumambient(acol, r, rn, al,
462	>	at->kid+i, ck0, s);
463	>	}
464	>	/* good enough? */
465	>	if (wsum >= 0.05 && s > minarad*10.0)
466	>	return(wsum);
467	>	}
468	>	/* adjust maximum angle */
469	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
470	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
471	>	/* sum this node */
472	>	for (av = at->alist; av != NULL; av = av->next) {
473	>	double  u, v, d, delta_r2, delta_t2;
474	>	COLOR   ct;
475	>	FVECT   uvw[3];
476	>	/* record access */
477	>	if (tracktime)
478	>	av->latick = ambclock;
479	>	/*
480	>	*  Ambient level test
481	>	*/
482	>	if (av->lvl > al ||     /* list sorted, so this works */
483	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
484	>	break;
485	>	/*
486	>	*  Direction test using unperturbed normal
487	>	*/
488	>	decodedir(uvw[2], av->ndir);
489	>	d = DOT(uvw[2], r->ron);
490	>	if (d <= 0.0)           /* >= 90 degrees */
491	>	continue;
492	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
493	>	if (delta_r2 >= maxangle*maxangle)
494	>	continue;
495	>	/*
496	>	*  Modified ray behind test
497	>	*/
498	>	VSUB(ck0, r->rop, av->pos);
499	>	d = DOT(ck0, uvw[2]);
500	>	if (d < -minarad*ambacc-.001)
501	>	continue;
502	>	d /= av->rad[0];
503	>	delta_t2 = d*d;
504	>	if (delta_t2 >= ambacc*ambacc)
505	>	continue;
506	>	/*
507	>	*  Elliptical radii test based on Hessian
508	>	*/
509	>	decodedir(uvw[0], av->udir);
510	>	VCROSS(uvw[1], uvw[2], uvw[0]);
511	>	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
512	>	delta_t2 += d*d;
513	>	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
514	>	delta_t2 += d*d;
515	>	if (delta_t2 >= ambacc*ambacc)
516	>	continue;
517	>	/*
518	>	*  Test for potential light leak
519	>	*/
520	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
521	>	continue;
522	>	/*
523	>	*  Extrapolate value and compute final weight (hat function)
524	>	*/
525	>	if (!extambient(ct, av, r->rop, rn, uvw))
526	>	continue;
527	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
528	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
529	>	scalecolor(ct, d);
530	>	addcolor(acol, ct);
531	>	wsum += d;
532	>	}
533	>	return(wsum);
534	>	}
535	>
536	>
537	>	static int
538	>	makeambient(            /* make a new ambient value for storage */
539	>	COLOR  acol,
540	>	RAY  *r,
541	>	FVECT  rn,
542	>	int  al
543	>	)
544	>	{
545	>	AMBVAL  amb;
546	>	FVECT   uvw[3];
547	>	int     i;
548	>
549	>	amb.weight = 1.0;                       /* compute weight */
550	>	for (i = al; i-- > 0; )
551	>	amb.weight *= AVGREFL;
552	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
553	>	amb.weight = 1.25*r->rweight;
554	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
555	>	/* compute ambient */
556	>	i = doambient(acol, r, amb.weight,
557	>	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
558	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
559	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
560	>	return(i);
561	>	/* store value */
562	>	VCOPY(amb.pos, r->rop);
563	>	amb.ndir = encodedir(r->ron);
564	>	amb.udir = encodedir(uvw[0]);
565	>	amb.lvl = al;
566	>	copycolor(amb.val, acol);
567	>	/* insert into tree */
568	>	avsave(&amb);                           /* and save to file */
569	>	if (rn != r->ron) {                     /* texture */
570	>	VCOPY(uvw[2], r->ron);
571	>	extambient(acol, &amb, r->rop, rn, uvw);
572	>	}
573	>	return(1);
574	>	}
575	>
576	>
577	>	static int
578	>	extambient(             /* extrapolate value at pv, nv */
579	>	COLOR  cr,
580	>	AMBVAL   *ap,
581	>	FVECT  pv,
582	>	FVECT  nv,
583	>	FVECT  uvw[3]
584	>	)
585	>	{
586	>	const double    min_d = 0.05;
587	>	static FVECT    my_uvw[3];
588	>	FVECT           v1;
589	>	int             i;
590	>	double          d = 1.0;        /* zeroeth order */
591	>
592	>	if (uvw == NULL) {              /* need local coordinates? */
593	>	decodedir(my_uvw[2], ap->ndir);
594	>	decodedir(my_uvw[0], ap->udir);
595	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
596	>	uvw = my_uvw;
597	>	}
598	>	for (i = 3; i--; )              /* gradient due to translation */
599	>	d += (pv[i] - ap->pos[i]) *
600	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
601	>
602	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
603	>	for (i = 3; i--; )
604	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
605	>
606	>	if (d < min_d)                  /* should not use if we can avoid it */
607	>	d = min_d;
608	>	copycolor(cr, ap->val);
609	>	scalecolor(cr, d);
610	>	return(d > min_d);
611	>	}
612	>
613	>
614	>	static void
615	>	avinsert(                               /* insert ambient value in our tree */
616	>	AMBVAL *av
617	>	)
618	>	{
619	>	AMBTREE  *at;
620	>	AMBVAL  *ap;
621	>	AMBVAL  avh;
622	>	FVECT  ck0;
623	>	double  s;
624	>	int  branch;
625	>	int  i;
626	>
627	>	if (av->rad[0] <= FTINY)
628	>	error(CONSISTENCY, "zero ambient radius in avinsert");
629	>	at = &atrunk;
630	>	VCOPY(ck0, thescene.cuorg);
631	>	s = thescene.cusize;
632	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
633	>	if (at->kid == NULL)
634	>	if ((at->kid = newambtree()) == NULL)
635	>	error(SYSTEM, "out of memory in avinsert");
636	>	s *= 0.5;
637	>	branch = 0;
638	>	for (i = 0; i < 3; i++)
639	>	if (av->pos[i] > ck0[i] + s) {
640	>	ck0[i] += s;
641	>	branch |= 1 << i;
642	>	}
643	>	at = at->kid + branch;
644	>	}
645	>	avh.next = at->alist;           /* order by increasing level */
646	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
647	>	if ( ap->next->lvl > av->lvl ||
648	>	(ap->next->lvl == av->lvl) &
649	>	(ap->next->weight <= av->weight) )
650	>	break;
651	>	av->next = ap->next;
652	>	ap->next = (AMBVAL*)av;
653	>	at->alist = avh.next;
654	>	}
655	>
656	>
657	>	#else /* ! NEWAMB */
658	>
659	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
660	>	AMBTREE *at, FVECT c0, double s);
661	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
662	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
663	>
664	>
665	>	void
666	>	multambient(            /* compute ambient component & multiply by coef. */
667	>	COLOR  aval,
668	>	RAY  *r,
669	>	FVECT  nrm
670	>	)
671	>	{
672	>	static int  rdepth = 0;                 /* ambient recursion */
673	>	COLOR   acol, caustic;
674	>	double  d, l;
675	>
676	>	/* PMAP: Factor in ambient from global photon map (if enabled) and return
677	>	* as all ambient components accounted for */
678	>	if (ambPmap(aval, r, rdepth))
679	>	return;
680	>
681	>	/* PMAP: Otherwise factor in ambient from caustic photon map
682	>	* (ambPmapCaustic() returns zero if caustic photons disabled) and
683	>	* continue with RADIANCE ambient calculation */
684	>	copycolor(caustic, aval);
685	>	ambPmapCaustic(caustic, r, rdepth);
686	>
687	>	if (ambdiv <= 0)                        /* no ambient calculation */
688	>	goto dumbamb;
689	>	/* check number of bounces */
690	>	if (rdepth >= ambounce)
691	>	goto dumbamb;
692	>	/* check ambient list */
693	>	if (ambincl != -1 && r->ro != NULL &&
694	>	ambincl != inset(ambset, r->ro->omod))
695	>	goto dumbamb;
696	>
697	>	if (ambacc <= FTINY) {                  /* no ambient storage */
698	>	copycolor(acol, aval);
699	>	rdepth++;
700	>	d = doambient(acol, r, r->rweight, NULL, NULL);
701		rdepth--;
702	+	if (d <= FTINY)
703	+	goto dumbamb;
704	+	copycolor(aval, acol);
705	+
706	+	/* PMAP: add in caustic */
707	+	addcolor(aval, caustic);
708	+	return;
709		}
710	<	if (d > FTINY)
710	>
711	>	if (tracktime)                          /* sort to minimize thrashing */
712	>	sortambvals(0);
713	>	/* interpolate ambient value */
714	>	setcolor(acol, 0.0, 0.0, 0.0);
715	>	d = sumambient(acol, r, nrm, rdepth,
716	>	&atrunk, thescene.cuorg, thescene.cusize);
717	>
718	>	if (d > FTINY) {
719	>	d = 1.0/d;
720	>	scalecolor(acol, d);
721	>	multcolor(aval, acol);
722	>
723	>	/* PMAP: add in caustic */
724	>	addcolor(aval, caustic);
725		return;
726	+	}
727	+
728	+	rdepth++;                               /* need to cache new value */
729	+	d = makeambient(acol, r, nrm, rdepth-1);
730	+	rdepth--;
731	+
732	+	if (d > FTINY) {
733	+	multcolor(aval, acol);          /* got new value */
734	+
735	+	/* PMAP: add in caustic */
736	+	addcolor(aval, caustic);
737	+	return;
738	+	}
739	+
740		dumbamb:                                        /* return global value */
741	<	copycolor(acol, ambval);
741	>	if ((ambvwt <= 0) | (navsum == 0)) {
742	>	multcolor(aval, ambval);
743	>
744	>	/* PMAP: add in caustic */
745	>	addcolor(aval, caustic);
746	>	return;
747	>	}
748	>
749	>	l = bright(ambval);                     /* average in computations */
750	>	if (l > FTINY) {
751	>	d = (log(l)*(double)ambvwt + avsum) /
752	>	(double)(ambvwt + navsum);
753	>	d = exp(d) / l;
754	>	scalecolor(aval, d);
755	>	multcolor(aval, ambval);        /* apply color of ambval */
756	>	} else {
757	>	d = exp( avsum / (double)navsum );
758	>	scalecolor(aval, d);            /* neutral color */
759	>	}
760		}
761
762
763	<	double
764	<	sumambient(acol, r, al, at, c0, s)      /* get interpolated ambient value */
765	<	COLOR  acol;
766	<	register RAY  *r;
767	<	int  al;
768	<	AMBTREE  *at;
769	<	FVECT  c0;
770	<	double  s;
763	>	static double
764	>	sumambient(     /* get interpolated ambient value */
765	>	COLOR  acol,
766	>	RAY  *r,
767	>	FVECT  rn,
768	>	int  al,
769	>	AMBTREE  *at,
770	>	FVECT  c0,
771	>	double  s
772	>	)
773		{
774	<	extern double  sqrt();
195	<	double  d, e1, e2, wt, wsum;
774	>	double  d, e1, e2, wt, wsum;
775		COLOR  ct;
776		FVECT  ck0;
777		int  i;
778	<	register int  j;
779	<	register AMBVAL  *av;
780	<	/* do this node */
778	>	int  j;
779	>	AMBVAL   *av;
780	>
781		wsum = 0.0;
782	+	/* do this node */
783		for (av = at->alist; av != NULL; av = av->next) {
784	+	double  rn_dot = -2.0;
785	+	if (tracktime)
786	+	av->latick = ambclock;
787		/*
788		*  Ambient level test.
789		*/
790	<	if (av->lvl > al || av->weight < r->rweight-FTINY)
791	<	continue;
790	>	if (av->lvl > al ||     /* list sorted, so this works */
791	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
792	>	break;
793		/*
794		*  Ambient radius test.
795		*/
796	<	e1 = 0.0;
797	<	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;
796	>	VSUB(ck0, av->pos, r->rop);
797	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
798		if (e1 > ambacc*ambacc*1.21)
799		continue;
800		/*
801	<	*  Normal direction test.
801	>	*  Direction test using closest normal.
802		*/
803	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
804	<	if (e2 < 0.0) e2 = 0.0;
805	<	if (e1 + e2 > ambacc*ambacc*1.21)
803	>	d = DOT(av->dir, r->ron);
804	>	if (rn != r->ron) {
805	>	rn_dot = DOT(av->dir, rn);
806	>	if (rn_dot > 1.0-FTINY)
807	>	rn_dot = 1.0-FTINY;
808	>	if (rn_dot >= d-FTINY) {
809	>	d = rn_dot;
810	>	rn_dot = -2.0;
811	>	}
812	>	}
813	>	e2 = (1.0 - d) * r->rweight;
814	>	if (e2 < 0.0)
815	>	e2 = 0.0;
816	>	else if (e1 + e2 > ambacc*ambacc*1.21)
817		continue;
818		/*
819		*  Ray behind test.
#	Line 236 | Line 827 | double  s;
827		/*
828		*  Jittering final test reduces image artifacts.
829		*/
830	<	wt = sqrt(e1) + sqrt(e2);
831	<	wt *= .9 + .2*urand(9015+samplendx);
832	<	if (wt > ambacc)
830	>	e1 = sqrt(e1);
831	>	e2 = sqrt(e2);
832	>	wt = e1 + e2;
833	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
834		continue;
835	+	/*
836	+	*  Recompute directional error using perturbed normal
837	+	*/
838	+	if (rn_dot > 0.0) {
839	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
840	+	wt = e1 + e2;
841	+	}
842		if (wt <= 1e-3)
843		wt = 1e3;
844		else
845		wt = 1.0 / wt;
846		wsum += wt;
847	<	extambient(ct, av, r->rop, r->ron);
847	>	extambient(ct, av, r->rop, rn);
848		scalecolor(ct, wt);
849		addcolor(acol, ct);
850		}
#	Line 264 | Line 863 | double  s;
863		break;
864		}
865		if (j == 3)
866	<	wsum += sumambient(acol, r, al, at->kid+i, ck0, s);
866	>	wsum += sumambient(acol, r, rn, al,
867	>	at->kid+i, ck0, s);
868		}
869		return(wsum);
870		}
871
872
873	<	double
874	<	makeambient(acol, r, al)        /* make a new ambient value */
875	<	COLOR  acol;
876	<	register RAY  *r;
877	<	int  al;
873	>	static double
874	>	makeambient(            /* make a new ambient value for storage */
875	>	COLOR  acol,
876	>	RAY  *r,
877	>	FVECT  rn,
878	>	int  al
879	>	)
880		{
881	<	AMBVAL  amb;
881	>	AMBVAL  amb;
882		FVECT   gp, gd;
883	<	/* compute weight */
884	<	amb.weight = pow(AVGREFL, (double)al);
885	<	if (r->rweight < 0.2*amb.weight)        /* heuristic */
886	<	amb.weight = r->rweight;
883	>	int     i;
884	>
885	>	amb.weight = 1.0;                       /* compute weight */
886	>	for (i = al; i-- > 0; )
887	>	amb.weight *= AVGREFL;
888	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
889	>	amb.weight = 1.25*r->rweight;
890	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
891		/* compute ambient */
892		amb.rad = doambient(acol, r, amb.weight, gp, gd);
893	<	if (amb.rad == 0.0)
893	>	if (amb.rad <= FTINY) {
894	>	setcolor(acol, 0.0, 0.0, 0.0);
895		return(0.0);
896	<	/* store it */
896	>	}
897	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
898	>	/* store value */
899		VCOPY(amb.pos, r->rop);
900		VCOPY(amb.dir, r->ron);
901		amb.lvl = al;
#	Line 294 | Line 903 | int  al;
903		VCOPY(amb.gpos, gp);
904		VCOPY(amb.gdir, gd);
905		/* insert into tree */
906	<	avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize);
907	<	avsave(&amb);                           /* write to file */
906	>	avsave(&amb);                           /* and save to file */
907	>	if (rn != r->ron)
908	>	extambient(acol, &amb, r->rop, rn);     /* texture */
909		return(amb.rad);
910		}
911
912
913	<	extambient(cr, ap, pv, nv)              /* extrapolate value at pv, nv */
914	<	COLOR  cr;
915	<	register AMBVAL  *ap;
916	<	FVECT  pv, nv;
913	>	static void
914	>	extambient(             /* extrapolate value at pv, nv */
915	>	COLOR  cr,
916	>	AMBVAL   *ap,
917	>	FVECT  pv,
918	>	FVECT  nv
919	>	)
920		{
921	<	FVECT  v1, v2;
922	<	register int  i;
923	<	double  d;
921	>	FVECT  v1;
922	>	int  i;
923	>	double  d;
924
925		d = 1.0;                        /* zeroeth order */
926		/* gradient due to translation */
927		for (i = 0; i < 3; i++)
928		d += ap->gpos[i]*(pv[i]-ap->pos[i]);
929		/* gradient due to rotation */
930	<	VCOPY(v1, ap->dir);
931	<	fcross(v2, v1, nv);
319	<	d += DOT(ap->gdir, v2);
930	>	VCROSS(v1, ap->dir, nv);
931	>	d += DOT(ap->gdir, v1);
932		if (d <= 0.0) {
933		setcolor(cr, 0.0, 0.0, 0.0);
934		return;
#	Line 326 | Line 938 | FVECT  pv, nv;
938		}
939
940
941	<	static
942	<	avsave(av)                              /* save an ambient value */
943	<	AMBVAL  *av;
941	>	static void
942	>	avinsert(                               /* insert ambient value in our tree */
943	>	AMBVAL *av
944	>	)
945		{
946	<	static int  nunflshed = 0;
947	<
948	<	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	<	{
946	>	AMBTREE  *at;
947	>	AMBVAL  *ap;
948	>	AMBVAL  avh;
949		FVECT  ck0;
950	+	double  s;
951		int  branch;
952	<	register AMBVAL  *av;
360	<	register int  i;
952	>	int  i;
953
954	<	if ((av = newambval()) == NULL)
955	<	goto memerr;
956	<	copystruct(av, aval);
957	<	VCOPY(ck0, c0);
954	>	if (av->rad <= FTINY)
955	>	error(CONSISTENCY, "zero ambient radius in avinsert");
956	>	at = &atrunk;
957	>	VCOPY(ck0, thescene.cuorg);
958	>	s = thescene.cusize;
959		while (s*(OCTSCALE/2) > av->rad*ambacc) {
960		if (at->kid == NULL)
961		if ((at->kid = newambtree()) == NULL)
962	<	goto memerr;
962	>	error(SYSTEM, "out of memory in avinsert");
963		s *= 0.5;
964		branch = 0;
965		for (i = 0; i < 3; i++)
#	Line 376 | Line 969 | double  s;
969		}
970		at = at->kid + branch;
971		}
972	<	av->next = at->alist;
973	<	at->alist = av;
972	>	avh.next = at->alist;           /* order by increasing level */
973	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
974	>	if ( ap->next->lvl > av->lvl ||
975	>	(ap->next->lvl == av->lvl) &
976	>	(ap->next->weight <= av->weight) )
977	>	break;
978	>	av->next = ap->next;
979	>	ap->next = (AMBVAL*)av;
980	>	at->alist = avh.next;
981	>	}
982	>
983	>	#endif  /* ! NEWAMB */
984	>
985	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
986	>
987	>	static void
988	>	initambfile(            /* initialize ambient file */
989	>	int  cre8
990	>	)
991	>	{
992	>	extern char  *progname, *octname;
993	>	static char  *mybuf = NULL;
994	>
995	>	#ifdef  F_SETLKW
996	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
997	>	#endif
998	>	SET_FILE_BINARY(ambfp);
999	>	if (mybuf == NULL)
1000	>	mybuf = (char *)bmalloc(BUFSIZ+8);
1001	>	setbuf(ambfp, mybuf);
1002	>	if (cre8) {                     /* new file */
1003	>	newheader("RADIANCE", ambfp);
1004	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
1005	>	progname, colval(ambval,RED),
1006	>	colval(ambval,GRN), colval(ambval,BLU),
1007	>	ambvwt, ambounce, ambacc);
1008	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
1009	>	ambdiv, ambssamp, ambres);
1010	>	if (octname != NULL)
1011	>	fputs(octname, ambfp);
1012	>	fputc('\n', ambfp);
1013	>	fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1014	>	fputnow(ambfp);
1015	>	fputformat(AMBFMT, ambfp);
1016	>	fputc('\n', ambfp);
1017	>	putambmagic(ambfp);
1018	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
1019	>	error(USER, "bad ambient file");
1020	>	}
1021	>
1022	>
1023	>	static void
1024	>	avsave(                         /* insert and save an ambient value */
1025	>	AMBVAL  *av
1026	>	)
1027	>	{
1028	>	avstore(av);
1029	>	if (ambfp == NULL)
1030	>	return;
1031	>	if (writambval(av, ambfp) < 0)
1032	>	goto writerr;
1033	>	if (++nunflshed >= AMBFLUSH)
1034	>	if (ambsync() == EOF)
1035	>	goto writerr;
1036		return;
1037	<	memerr:
1038	<	error(SYSTEM, "out of memory in avinsert");
1037	>	writerr:
1038	>	error(SYSTEM, "error writing to ambient file");
1039		}
1040	+
1041	+
1042	+	static AMBVAL *
1043	+	avstore(                                /* allocate memory and save aval */
1044	+	AMBVAL  *aval
1045	+	)
1046	+	{
1047	+	AMBVAL  *av;
1048	+	double  d;
1049	+
1050	+	if ((av = newambval()) == NULL)
1051	+	error(SYSTEM, "out of memory in avstore");
1052	+	*av = *aval;
1053	+	av->latick = ambclock;
1054	+	av->next = NULL;
1055	+	nambvals++;
1056	+	d = bright(av->val);
1057	+	if (d > FTINY) {                /* add to log sum for averaging */
1058	+	avsum += log(d);
1059	+	navsum++;
1060	+	}
1061	+	avinsert(av);                   /* insert in our cache tree */
1062	+	return(av);
1063	+	}
1064	+
1065	+
1066	+	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
1067	+
1068	+	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
1069	+
1070	+
1071	+	static AMBTREE *
1072	+	newambtree(void)                                /* allocate 8 ambient tree structs */
1073	+	{
1074	+	AMBTREE  *atp, *upperlim;
1075	+
1076	+	if (atfreelist == NULL) {       /* get more nodes */
1077	+	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
1078	+	if (atfreelist == NULL)
1079	+	return(NULL);
1080	+	/* link new free list */
1081	+	upperlim = atfreelist + 8*(ATALLOCSZ-1);
1082	+	for (atp = atfreelist; atp < upperlim; atp += 8)
1083	+	atp->kid = atp + 8;
1084	+	atp->kid = NULL;
1085	+	}
1086	+	atp = atfreelist;
1087	+	atfreelist = atp->kid;
1088	+	memset(atp, 0, 8*sizeof(AMBTREE));
1089	+	return(atp);
1090	+	}
1091	+
1092	+
1093	+	static void
1094	+	freeambtree(                    /* free 8 ambient tree structs */
1095	+	AMBTREE  *atp
1096	+	)
1097	+	{
1098	+	atp->kid = atfreelist;
1099	+	atfreelist = atp;
1100	+	}
1101	+
1102	+
1103	+	static void
1104	+	unloadatree(                    /* unload an ambient value tree */
1105	+	AMBTREE  *at,
1106	+	unloadtf_t *f
1107	+	)
1108	+	{
1109	+	AMBVAL  *av;
1110	+	int  i;
1111	+	/* transfer values at this node */
1112	+	for (av = at->alist; av != NULL; av = at->alist) {
1113	+	at->alist = av->next;
1114	+	av->next = NULL;
1115	+	(*f)(av);
1116	+	}
1117	+	if (at->kid == NULL)
1118	+	return;
1119	+	for (i = 0; i < 8; i++)         /* transfer and free children */
1120	+	unloadatree(at->kid+i, f);
1121	+	freeambtree(at->kid);
1122	+	at->kid = NULL;
1123	+	}
1124	+
1125	+
1126	+	static struct avl {
1127	+	AMBVAL  *p;
1128	+	unsigned long   t;
1129	+	}       *avlist1;                       /* ambient value list with ticks */
1130	+	static AMBVAL   **avlist2;              /* memory positions for sorting */
1131	+	static int      i_avlist;               /* index for lists */
1132	+
1133	+	static int alatcmp(const void *av1, const void *av2);
1134	+
1135	+	static void
1136	+	avfree(AMBVAL *av)
1137	+	{
1138	+	free(av);
1139	+	}
1140	+
1141	+	static void
1142	+	av2list(
1143	+	AMBVAL *av
1144	+	)
1145	+	{
1146	+	#ifdef DEBUG
1147	+	if (i_avlist >= nambvals)
1148	+	error(CONSISTENCY, "too many ambient values in av2list1");
1149	+	#endif
1150	+	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1151	+	avlist1[i_avlist++].t = av->latick;
1152	+	}
1153	+
1154	+
1155	+	static int
1156	+	alatcmp(                        /* compare ambient values for MRA */
1157	+	const void *av1,
1158	+	const void *av2
1159	+	)
1160	+	{
1161	+	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1162	+	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1163	+	}
1164	+
1165	+
1166	+	/* GW NOTE 2002/10/3:
1167	+	* I used to compare AMBVAL pointers, but found that this was the
1168	+	* cause of a serious consistency error with gcc, since the optimizer
1169	+	* uses some dangerous trick in pointer subtraction that
1170	+	* assumes pointers differ by exact struct size increments.
1171	+	*/
1172	+	static int
1173	+	aposcmp(                        /* compare ambient value positions */
1174	+	const void      *avp1,
1175	+	const void      *avp2
1176	+	)
1177	+	{
1178	+	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1179	+	if (diff < 0)
1180	+	return(-1);
1181	+	return(diff > 0);
1182	+	}
1183	+
1184	+
1185	+	static int
1186	+	avlmemi(                                /* find list position from address */
1187	+	AMBVAL  *avaddr
1188	+	)
1189	+	{
1190	+	AMBVAL  **avlpp;
1191	+
1192	+	avlpp = (AMBVAL **)bsearch(&avaddr, avlist2,
1193	+	nambvals, sizeof(AMBVAL *), aposcmp);
1194	+	if (avlpp == NULL)
1195	+	error(CONSISTENCY, "address not found in avlmemi");
1196	+	return(avlpp - avlist2);
1197	+	}
1198	+
1199	+
1200	+	static void
1201	+	sortambvals(                    /* resort ambient values */
1202	+	int     always
1203	+	)
1204	+	{
1205	+	AMBTREE  oldatrunk;
1206	+	AMBVAL  tav, *tap, *pnext;
1207	+	int     i, j;
1208	+	/* see if it's time yet */
1209	+	if (!always && (ambclock++ < lastsort+sortintvl ||
1210	+	nambvals < SORT_THRESH))
1211	+	return;
1212	+	/*
1213	+	* The idea here is to minimize memory thrashing
1214	+	* in VM systems by improving reference locality.
1215	+	* We do this by periodically sorting our stored ambient
1216	+	* values in memory in order of most recently to least
1217	+	* recently accessed.  This ordering was chosen so that new
1218	+	* ambient values (which tend to be less important) go into
1219	+	* higher memory with the infrequently accessed values.
1220	+	*      Since we expect our values to need sorting less
1221	+	* frequently as the process continues, we double our
1222	+	* waiting interval after each call.
1223	+	*      This routine is also called by setambacc() with
1224	+	* the "always" parameter set to 1 so that the ambient
1225	+	* tree will be rebuilt with the new accuracy parameter.
1226	+	*/
1227	+	if (tracktime) {                /* allocate pointer arrays to sort */
1228	+	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1229	+	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1230	+	} else {
1231	+	avlist2 = NULL;
1232	+	avlist1 = NULL;
1233	+	}
1234	+	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1235	+	if (avlist2 != NULL)
1236	+	free(avlist2);
1237	+	if (always) {           /* rebuild without sorting */
1238	+	oldatrunk = atrunk;
1239	+	atrunk.alist = NULL;
1240	+	atrunk.kid = NULL;
1241	+	unloadatree(&oldatrunk, avinsert);
1242	+	}
1243	+	} else {                        /* sort memory by last access time */
1244	+	/*
1245	+	* Sorting memory is tricky because it isn't contiguous.
1246	+	* We have to sort an array of pointers by MRA and also
1247	+	* by memory position.  We then copy values in "loops"
1248	+	* to minimize memory hits.  Nevertheless, we will visit
1249	+	* everyone at least twice, and this is an expensive process
1250	+	* when we're thrashing, which is when we need to do it.
1251	+	*/
1252	+	#ifdef DEBUG
1253	+	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1254	+	nambvals, ambclock);
1255	+	eputs(errmsg);
1256	+	#endif
1257	+	i_avlist = 0;
1258	+	unloadatree(&atrunk, av2list);  /* empty current tree */
1259	+	#ifdef DEBUG
1260	+	if (i_avlist < nambvals)
1261	+	error(CONSISTENCY, "missing ambient values in sortambvals");
1262	+	#endif
1263	+	qsort(avlist1, nambvals, sizeof(struct avl), alatcmp);
1264	+	qsort(avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1265	+	for (i = 0; i < nambvals; i++) {
1266	+	if (avlist1[i].p == NULL)
1267	+	continue;
1268	+	tap = avlist2[i];
1269	+	tav = *tap;
1270	+	for (j = i; (pnext = avlist1[j].p) != tap;
1271	+	j = avlmemi(pnext)) {
1272	+	*(avlist2[j]) = *pnext;
1273	+	avinsert(avlist2[j]);
1274	+	avlist1[j].p = NULL;
1275	+	}
1276	+	*(avlist2[j]) = tav;
1277	+	avinsert(avlist2[j]);
1278	+	avlist1[j].p = NULL;
1279	+	}
1280	+	free(avlist1);
1281	+	free(avlist2);
1282	+	/* compute new sort interval */
1283	+	sortintvl = ambclock - lastsort;
1284	+	if (sortintvl >= MAX_SORT_INTVL/2)
1285	+	sortintvl = MAX_SORT_INTVL;
1286	+	else
1287	+	sortintvl <<= 1;        /* wait twice as long next */
1288	+	#ifdef DEBUG
1289	+	eputs("done\n");
1290	+	#endif
1291	+	}
1292	+	if (ambclock >= MAXACLOCK)
1293	+	ambclock = MAXACLOCK/2;
1294	+	lastsort = ambclock;
1295	+	}
1296	+
1297	+
1298	+	#ifdef  F_SETLKW
1299	+
1300	+	static void
1301	+	aflock(                 /* lock/unlock ambient file */
1302	+	int  typ
1303	+	)
1304	+	{
1305	+	static struct flock  fls;       /* static so initialized to zeroes */
1306	+
1307	+	if (typ == fls.l_type)          /* already called? */
1308	+	return;
1309	+	fls.l_type = typ;
1310	+	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1311	+	error(SYSTEM, "cannot (un)lock ambient file");
1312	+	}
1313	+
1314	+
1315	+	int
1316	+	ambsync(void)                   /* synchronize ambient file */
1317	+	{
1318	+	long  flen;
1319	+	AMBVAL  avs;
1320	+	int  n;
1321	+
1322	+	if (ambfp == NULL)      /* no ambient file? */
1323	+	return(0);
1324	+	/* gain appropriate access */
1325	+	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1326	+	/* see if file has grown */
1327	+	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1328	+	goto seekerr;
1329	+	if ((n = flen - lastpos) > 0) {         /* file has grown */
1330	+	if (ambinp == NULL) {           /* get new file pointer */
1331	+	ambinp = fopen(ambfile, "rb");
1332	+	if (ambinp == NULL)
1333	+	error(SYSTEM, "fopen failed in ambsync");
1334	+	}
1335	+	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1336	+	goto seekerr;
1337	+	while (n >= AMBVALSIZ) {        /* load contributed values */
1338	+	if (!readambval(&avs, ambinp)) {
1339	+	sprintf(errmsg,
1340	+	"ambient file \"%s\" corrupted near character %ld",
1341	+	ambfile, flen - n);
1342	+	error(WARNING, errmsg);
1343	+	break;
1344	+	}
1345	+	avstore(&avs);
1346	+	n -= AMBVALSIZ;
1347	+	}
1348	+	lastpos = flen - n;             /* check alignment */
1349	+	if (n && lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1350	+	goto seekerr;
1351	+	}
1352	+	n = fflush(ambfp);                      /* calls write() at last */
1353	+	lastpos += (long)nunflshed*AMBVALSIZ;
1354	+	aflock(F_UNLCK);                        /* release file */
1355	+	nunflshed = 0;
1356	+	return(n);
1357	+	seekerr:
1358	+	error(SYSTEM, "seek failed in ambsync");
1359	+	return(EOF);    /* pro forma return */
1360	+	}
1361	+
1362	+	#else   /* ! F_SETLKW */
1363	+
1364	+	int
1365	+	ambsync(void)                   /* flush ambient file */
1366	+	{
1367	+	if (ambfp == NULL)
1368	+	return(0);
1369	+	nunflshed = 0;
1370	+	return(fflush(ambfp));
1371	+	}
1372	+
1373	+	#endif  /* ! F_SETLKW */

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