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

Comparing ray/src/rt/ambient.c (file contents):
Revision 1.13 by greg, Thu Jun 6 10:48:50 1991 UTC vs.
Revision 2.111 by greg, Thu Nov 18 19:38:21 2021 UTC

#	Line 1 | Line 1
1	<	/* Copyright (c) 1986 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  "otspecial.h"
16	>	#include  "resolu.h"
17	>	#include  "ambient.h"
18		#include  "random.h"
19	+	#include  "pmapamb.h"
20
21	<	#define  OCTSCALE       0.5     /* ceil((valid rad.)/(cube size)) */
21	>	#ifndef  OCTSCALE
22	>	#define  OCTSCALE       1.0     /* ceil((valid rad.)/(cube size)) */
23	>	#endif
24
25	<	extern CUBE  thescene;          /* contains space boundaries */
25	>	extern char  *shm_boundary;     /* memory sharing boundary */
26
27	<	extern COLOR  ambval;           /* global ambient component */
28	<	extern double  ambacc;          /* ambient accuracy */
29	<	extern int  ambres;             /* ambient resolution */
30	<	extern int  ambdiv;             /* number of divisions for calculation */
32	<	extern int  ambssamp;           /* number of super-samples */
33	<	extern int  ambounce;           /* number of ambient bounces */
34	<	extern char  *amblist[];        /* ambient include/exclude list */
35	<	extern int  ambincl;            /* include == 1, exclude == 0 */
27	>	#ifndef  MAXASET
28	>	#define  MAXASET        4095    /* maximum number of elements in ambient set */
29	>	#endif
30	>	OBJECT  ambset[MAXASET+1]={0};  /* ambient include/exclude set */
31
32	<	#define  MAXASET        511     /* maximum number of elements in ambient set */
33	<	OBJECT  ambset[MAXASET+1]={0};  /* ambient include/exclude set */
32	>	double  maxarad;                /* maximum ambient radius */
33	>	double  minarad;                /* minimum ambient radius */
34
35	<	double  maxarad;                /* maximum ambient radius */
41	<	double  minarad;                /* minimum ambient radius */
35	>	static AMBTREE  atrunk;         /* our ambient trunk node */
36
37	<	/*
38	<	* Since we've defined our vectors as float below to save space,
45	<	* watch out for changes in the definitions of VCOPY() and DOT().
46	<	*/
47	<	typedef struct ambval {
48	<	float  pos[3];          /* position in space */
49	<	float  dir[3];          /* normal direction */
50	<	int  lvl;               /* recursion level of parent ray */
51	<	float  weight;          /* weight of parent ray */
52	<	COLOR  val;             /* computed ambient value */
53	<	float  rad;             /* validity radius */
54	<	struct ambval  *next;   /* next in list */
55	<	}  AMBVAL;                      /* ambient value */
37	>	static FILE  *ambfp = NULL;     /* ambient file pointer */
38	>	static int  nunflshed = 0;      /* number of unflushed ambient values */
39
40	<	typedef struct ambtree {
41	<	AMBVAL  *alist;         /* ambient value list */
42	<	struct ambtree  *kid;   /* 8 child nodes */
43	<	}  AMBTREE;                     /* ambient octree */
40	>	#ifndef SORT_THRESH
41	>	#ifdef SMLMEM
42	>	#define SORT_THRESH     ((16L<<20)/sizeof(AMBVAL))
43	>	#else
44	>	#define SORT_THRESH     ((64L<<20)/sizeof(AMBVAL))
45	>	#endif
46	>	#endif
47	>	#ifndef SORT_INTVL
48	>	#define SORT_INTVL      (SORT_THRESH<<1)
49	>	#endif
50	>	#ifndef MAX_SORT_INTVL
51	>	#define MAX_SORT_INTVL  (SORT_INTVL<<6)
52	>	#endif
53
62	–	typedef struct {
63	–	float  k;               /* error contribution per sample */
64	–	COLOR  v;               /* ray sum */
65	–	int  n;                 /* number of samples */
66	–	short  t, p;            /* theta, phi indices */
67	–	}  AMBSAMP;                     /* ambient sample */
54
55	<	static AMBTREE  atrunk;         /* our ambient trunk node */
55	>	static double  avsum = 0.;              /* computed ambient value sum (log) */
56	>	static unsigned int  navsum = 0;        /* number of values in avsum */
57	>	static unsigned int  nambvals = 0;      /* total number of indirect values */
58	>	static unsigned int  nambshare = 0;     /* number of values from file */
59	>	static unsigned long  ambclock = 0;     /* ambient access clock */
60	>	static unsigned long  lastsort = 0;     /* time of last value sort */
61	>	static long  sortintvl = SORT_INTVL;    /* time until next sort */
62	>	static FILE  *ambinp = NULL;            /* auxiliary file for input */
63	>	static long  lastpos = -1;              /* last flush position */
64
65	<	static FILE  *ambfp = NULL;     /* ambient file pointer */
65	>	#define MAXACLOCK       (1L<<30)        /* clock turnover value */
66	>	/*
67	>	* Track access times unless we are sharing ambient values
68	>	* through memory on a multiprocessor, when we want to avoid
69	>	* claiming our own memory (copy on write).  Go ahead anyway
70	>	* if more than two thirds of our values are unshared.
71	>	* Compile with -Dtracktime=0 to turn this code off.
72	>	*/
73	>	#ifndef tracktime
74	>	#define tracktime       (shm_boundary == NULL || nambvals > 3*nambshare)
75	>	#endif
76
77	<	#define  newambval()    (AMBVAL *)bmalloc(sizeof(AMBVAL))
77	>	#define  AMBFLUSH       (BUFSIZ/AMBVALSIZ)
78
79	<	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
79	>	#define  newambval()    (AMBVAL *)malloc(sizeof(AMBVAL))
80
81	<	double  sumambient(), doambient(), makeambient();
81	>	#define  tfunc(lwr, x, upr)     (((x)-(lwr))/((upr)-(lwr)))
82
83	+	static void initambfile(int creat);
84	+	static void avsave(AMBVAL *av);
85	+	static AMBVAL *avstore(AMBVAL  *aval);
86	+	static AMBTREE *newambtree(void);
87	+	static void freeambtree(AMBTREE  *atp);
88
89	<	setambient(afile)                       /* initialize calculation */
90	<	char  *afile;
89	>	typedef void unloadtf_t(AMBVAL *);
90	>	static unloadtf_t avinsert;
91	>	static unloadtf_t av2list;
92	>	static unloadtf_t avfree;
93	>	static void unloadatree(AMBTREE  *at, unloadtf_t *f);
94	>
95	>	static int aposcmp(const void *avp1, const void *avp2);
96	>	static int avlmemi(AMBVAL *avaddr);
97	>	static void sortambvals(int always);
98	>
99	>	static int      plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang);
100	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
101	>	AMBTREE *at, FVECT c0, double s);
102	>	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
103	>	static int      extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
104	>	FVECT uvw[3]);
105	>
106	>	#ifdef  F_SETLKW
107	>	static void aflock(int  typ);
108	>	#endif
109	>
110	>
111	>	void
112	>	setambres(                              /* set ambient resolution */
113	>	int  ar
114	>	)
115		{
116	<	long  ftell();
117	<	AMBVAL  amb;
116	>	ambres = ar < 0 ? 0 : ar;               /* may be done already */
117	>	/* set min & max radii */
118	>	if (ar <= 0) {
119	>	minarad = 0;
120	>	maxarad = thescene.cusize*0.2;
121	>	} else {
122	>	minarad = thescene.cusize / ar;
123	>	maxarad = 64.0 * minarad;               /* heuristic */
124	>	if (maxarad > thescene.cusize*0.2)
125	>	maxarad = thescene.cusize*0.2;
126	>	}
127	>	if (minarad <= FTINY)
128	>	minarad = 10.0*FTINY;
129	>	if (maxarad <= minarad)
130	>	maxarad = 64.0 * minarad;
131	>	}
132
86	–	maxarad = thescene.cusize / 2.0;                /* maximum radius */
87	–	/* minimum radius */
88	–	minarad = ambres > 0 ? thescene.cusize/ambres : 0.0;
133
134	<	/* open ambient file */
135	<	if (afile != NULL)
136	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
137	<	while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1)
138	<	avinsert(&amb, &atrunk, thescene.cuorg,
139	<	thescene.cusize);
140	<	/* align */
141	<	fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1);
142	<	} else if ((ambfp = fopen(afile, "w")) == NULL) {
143	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
144	<	afile);
145	<	error(SYSTEM, errmsg);
134	>	void
135	>	setambacc(                              /* set ambient accuracy */
136	>	double  newa
137	>	)
138	>	{
139	>	static double   olda;           /* remember previous setting here */
140	>
141	>	newa *= (newa > 0);
142	>	if (fabs(newa - olda) >= .05*(newa + olda)) {
143	>	ambacc = newa;
144	>	if (ambacc > FTINY && nambvals > 0)
145	>	sortambvals(1);         /* rebuild tree */
146	>	}
147	>	}
148	>
149	>
150	>	void
151	>	setambient(void)                                /* initialize calculation */
152	>	{
153	>	int     readonly = 0;
154	>	long    flen;
155	>	AMBVAL  amb;
156	>	/* make sure we're fresh */
157	>	ambdone();
158	>	/* init ambient limits */
159	>	setambres(ambres);
160	>	setambacc(ambacc);
161	>	if (ambfile == NULL || !ambfile[0])
162	>	return;
163	>	if (ambacc <= FTINY) {
164	>	sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
165	>	ambfile);
166	>	error(WARNING, errmsg);
167	>	return;
168	>	}
169	>	/* open ambient file */
170	>	if ((ambfp = fopen(ambfile, "r+")) == NULL)
171	>	readonly = (ambfp = fopen(ambfile, "r")) != NULL;
172	>	if (ambfp != NULL) {
173	>	initambfile(0);                 /* file exists */
174	>	lastpos = ftell(ambfp);
175	>	while (readambval(&amb, ambfp))
176	>	avstore(&amb);
177	>	nambshare = nambvals;           /* share loaded values */
178	>	if (readonly) {
179	>	sprintf(errmsg,
180	>	"loaded %u values from read-only ambient file",
181	>	nambvals);
182	>	error(WARNING, errmsg);
183	>	fclose(ambfp);          /* close file so no writes */
184	>	ambfp = NULL;
185	>	return;                 /* avoid ambsync() */
186		}
187	+	/* align file pointer */
188	+	lastpos += (long)nambvals*AMBVALSIZ;
189	+	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
190	+	if (flen != lastpos) {
191	+	sprintf(errmsg,
192	+	"ignoring last %ld values in ambient file (corrupted)",
193	+	(flen - lastpos)/AMBVALSIZ);
194	+	error(WARNING, errmsg);
195	+	fseek(ambfp, lastpos, SEEK_SET);
196	+	ftruncate(fileno(ambfp), (off_t)lastpos);
197	+	}
198	+	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
199	+	initambfile(1);                 /* else create new file */
200	+	fflush(ambfp);
201	+	lastpos = ftell(ambfp);
202	+	} else {
203	+	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
204	+	error(SYSTEM, errmsg);
205	+	}
206	+	#ifdef  F_SETLKW
207	+	aflock(F_UNLCK);                        /* release file */
208	+	#endif
209		}
210
211
212	<	ambnotify(obj)                  /* record new modifier */
213	<	OBJECT  obj;
212	>	void
213	>	ambdone(void)                   /* close ambient file and free memory */
214		{
215	+	if (ambfp != NULL) {            /* close ambient file */
216	+	ambsync();
217	+	fclose(ambfp);
218	+	ambfp = NULL;
219	+	if (ambinp != NULL) {
220	+	fclose(ambinp);
221	+	ambinp = NULL;
222	+	}
223	+	lastpos = -1;
224	+	}
225	+	/* free ambient tree */
226	+	unloadatree(&atrunk, avfree);
227	+	/* reset state variables */
228	+	avsum = 0.;
229	+	navsum = 0;
230	+	nambvals = 0;
231	+	nambshare = 0;
232	+	ambclock = 0;
233	+	lastsort = 0;
234	+	sortintvl = SORT_INTVL;
235	+	}
236	+
237	+
238	+	void
239	+	ambnotify(                      /* record new modifier */
240	+	OBJECT  obj
241	+	)
242	+	{
243		static int  hitlimit = 0;
244	<	register OBJREC  *o = objptr(obj);
245	<	register char  **amblp;
244	>	OBJREC   *o;
245	>	char  **amblp;
246
247	+	if (obj == OVOID) {             /* starting over */
248	+	ambset[0] = 0;
249	+	hitlimit = 0;
250	+	return;
251	+	}
252	+	o = objptr(obj);
253		if (hitlimit || !ismodifier(o->otype))
254		return;
255		for (amblp = amblist; *amblp != NULL; amblp++)
#	Line 125 | Line 265 | OBJECT  obj;
265		}
266
267
268	<	ambient(acol, r)                /* compute ambient component for ray */
269	<	COLOR  acol;
270	<	register RAY  *r;
268	>	void
269	>	multambient(            /* compute ambient component & multiply by coef. */
270	>	COLOR  aval,
271	>	RAY  *r,
272	>	FVECT  nrm
273	>	)
274		{
275	+	static double  logAvgAbsorp = 1;
276		static int  rdepth = 0;                 /* ambient recursion */
277	<	double  wsum;
277	>	COLOR   acol, caustic;
278	>	int     i, ok;
279	>	double  d, l;
280
281	<	rdepth++;                               /* increment level */
281	>	/* PMAP: Factor in ambient from photon map, if enabled and ray is
282	>	* ambient. Return as all ambient components accounted for, else
283	>	* continue. */
284	>	if (ambPmap(aval, r, rdepth))
285	>	return;
286
287	+	if (logAvgAbsorp > 0)                   /* exclude in -aw to avoid growth */
288	+	logAvgAbsorp = log(1.-AVGREFL);
289	+
290	+	/* PMAP: Factor in specular-diffuse ambient (caustics) from photon
291	+	* map, if enabled and ray is primary, else caustic is zero.  Continue
292	+	* with RADIANCE ambient calculation */
293	+	copycolor(caustic, aval);
294	+	ambPmapCaustic(caustic, r, rdepth);
295	+
296		if (ambdiv <= 0)                        /* no ambient calculation */
297		goto dumbamb;
298		/* check number of bounces */
299	<	if (rdepth > ambounce)
299	>	if (rdepth >= ambounce)
300		goto dumbamb;
301		/* check ambient list */
302		if (ambincl != -1 && r->ro != NULL &&
#	Line 145 | Line 304 | register RAY  *r;
304		goto dumbamb;
305
306		if (ambacc <= FTINY) {                  /* no ambient storage */
307	<	if (doambient(acol, r) == 0.0)
307	>	FVECT   uvd[2];
308	>	float   dgrad[2], *dgp = NULL;
309	>
310	>	if (nrm != r->ron && DOT(nrm,r->ron) < 0.9999)
311	>	dgp = dgrad;            /* compute rotational grad. */
312	>	copycolor(acol, aval);
313	>	rdepth++;
314	>	ok = doambient(acol, r, r->rweight,
315	>	uvd, NULL, NULL, dgp, NULL);
316	>	rdepth--;
317	>	if (!ok)
318		goto dumbamb;
319	<	goto done;
319	>	if ((ok > 0) & (dgp != NULL)) { /* apply texture */
320	>	FVECT   v1;
321	>	VCROSS(v1, r->ron, nrm);
322	>	d = 1.0;
323	>	for (i = 3; i--; )
324	>	d += v1[i] * (dgp[0]*uvd[0][i] + dgp[1]*uvd[1][i]);
325	>	if (d >= 0.05)
326	>	scalecolor(acol, d);
327	>	}
328	>	copycolor(aval, acol);
329	>
330	>	/* PMAP: add in caustic */
331	>	addcolor(aval, caustic);
332	>	return;
333		}
334	<	/* get ambient value */
334	>
335	>	if (tracktime)                          /* sort to minimize thrashing */
336	>	sortambvals(0);
337	>	/* interpolate ambient value */
338		setcolor(acol, 0.0, 0.0, 0.0);
339	<	wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize);
340	<	if (wsum > FTINY)
341	<	scalecolor(acol, 1.0/wsum);
342	<	else if (makeambient(acol, r) == 0.0)
343	<	goto dumbamb;
344	<	goto done;
339	>	d = sumambient(acol, r, nrm, rdepth,
340	>	&atrunk, thescene.cuorg, thescene.cusize);
341	>
342	>	if (d > FTINY) {
343	>	d = 1.0/d;
344	>	scalecolor(acol, d);
345	>	multcolor(aval, acol);
346
347	<	dumbamb:                                        /* return global value */
348	<	copycolor(acol, ambval);
349	<	done:                                           /* must finish here! */
347	>	/* PMAP: add in caustic */
348	>	addcolor(aval, caustic);
349	>	return;
350	>	}
351	>
352	>	rdepth++;                               /* need to cache new value */
353	>	ok = makeambient(acol, r, nrm, rdepth-1);
354		rdepth--;
355	+
356	+	if (ok) {
357	+	multcolor(aval, acol);          /* computed new value */
358	+
359	+	/* PMAP: add in caustic */
360	+	addcolor(aval, caustic);
361	+	return;
362	+	}
363	+
364	+	dumbamb:                                        /* return global value */
365	+	if ((ambvwt <= 0) | (navsum == 0)) {
366	+	multcolor(aval, ambval);
367	+
368	+	/* PMAP: add in caustic */
369	+	addcolor(aval, caustic);
370	+	return;
371	+	}
372	+
373	+	l = bright(ambval);                     /* average in computations */
374	+	if (l > FTINY) {
375	+	d = (log(l)*(double)ambvwt + avsum + logAvgAbsorp*navsum) /
376	+	(double)(ambvwt + navsum);
377	+	d = exp(d) / l;
378	+	scalecolor(aval, d);
379	+	multcolor(aval, ambval);        /* apply color of ambval */
380	+	} else {
381	+	d = exp( avsum/(double)navsum + logAvgAbsorp );
382	+	scalecolor(aval, d);            /* neutral color */
383	+	}
384		}
385
386
387	<	double
388	<	sumambient(acol, r, at, c0, s)          /* get interpolated ambient value */
389	<	COLOR  acol;
171	<	register RAY  *r;
172	<	AMBTREE  *at;
173	<	FVECT  c0;
174	<	double  s;
387	>	/* Plug a potential leak where ambient cache value is occluded */
388	>	static int
389	>	plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
390		{
391	<	extern double  sqrt();
392	<	double  d, e1, e2, wt, wsum;
393	<	COLOR  ct;
394	<	FVECT  ck0;
395	<	int  i;
396	<	register int  j;
397	<	register AMBVAL  *av;
398	<	/* do this node */
399	<	wsum = 0.0;
391	>	const double    cost70sq = 0.1169778;   /* cos(70deg)^2 */
392	>	RAY             rtst;
393	>	FVECT           vdif;
394	>	double          normdot, ndotd, nadotd;
395	>	double          a, b, c, t[2];
396	>
397	>	ang += 2.*PI*(ang < 0);                 /* check direction flags */
398	>	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
399	>	return(0);
400	>	/*
401	>	* Generate test ray, targeting 20 degrees above sample point plane
402	>	* along surface normal from cache position.  This should be high
403	>	* enough to miss local geometry we don't really care about.
404	>	*/
405	>	VSUB(vdif, ap->pos, r->rop);
406	>	normdot = DOT(anorm, r->ron);
407	>	ndotd = DOT(vdif, r->ron);
408	>	nadotd = DOT(vdif, anorm);
409	>	a = normdot*normdot - cost70sq;
410	>	b = 2.0*(normdot*ndotd - nadotd*cost70sq);
411	>	c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq;
412	>	if (quadratic(t, a, b, c) != 2)
413	>	return(1);                      /* should rarely happen */
414	>	if (t[1] <= FTINY)
415	>	return(0);                      /* should fail behind test */
416	>	rayorigin(&rtst, SHADOW, r, NULL);
417	>	VSUM(rtst.rdir, vdif, anorm, t[1]);     /* further dist. > plane */
418	>	rtst.rmax = normalize(rtst.rdir);       /* short ray test */
419	>	while (localhit(&rtst, &thescene)) {    /* check for occluder */
420	>	OBJREC  *m = findmaterial(rtst.ro);
421	>	if (m != NULL && !istransp(m->otype) && !isBSDFproxy(m) &&
422	>	(rtst.clipset == NULL ||
423	>	!inset(rtst.clipset, rtst.ro->omod)))
424	>	return(1);              /* plug light leak */
425	>	VCOPY(rtst.rorg, rtst.rop);     /* skip invisible surface */
426	>	rtst.rmax -= rtst.rot;
427	>	rayclear(&rtst);
428	>	}
429	>	return(0);                              /* seems we're OK */
430	>	}
431	>
432	>
433	>	static double
434	>	sumambient(             /* get interpolated ambient value */
435	>	COLOR  acol,
436	>	RAY  *r,
437	>	FVECT  rn,
438	>	int  al,
439	>	AMBTREE  *at,
440	>	FVECT  c0,
441	>	double  s
442	>	)
443	>	{                       /* initial limit is 10 degrees plus ambacc radians */
444	>	const double    minangle = 10.0 * PI/180.;
445	>	double          maxangle = minangle + ambacc;
446	>	double          wsum = 0.0;
447	>	FVECT           ck0;
448	>	int             i, j;
449	>	AMBVAL          *av;
450	>
451	>	if (at->kid != NULL) {          /* sum children first */
452	>	s *= 0.5;
453	>	for (i = 0; i < 8; i++) {
454	>	for (j = 0; j < 3; j++) {
455	>	ck0[j] = c0[j];
456	>	if (1<<j & i)
457	>	ck0[j] += s;
458	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
459	>	break;
460	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
461	>	break;
462	>	}
463	>	if (j == 3)
464	>	wsum += sumambient(acol, r, rn, al,
465	>	at->kid+i, ck0, s);
466	>	}
467	>	/* good enough? */
468	>	if (wsum >= 0.05 && s > minarad*10.0)
469	>	return(wsum);
470	>	}
471	>	/* adjust maximum angle */
472	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
473	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
474	>	/* sum this node */
475		for (av = at->alist; av != NULL; av = av->next) {
476	+	double  u, v, d, delta_r2, delta_t2;
477	+	COLOR   ct;
478	+	FVECT   uvw[3];
479	+	/* record access */
480	+	if (tracktime)
481	+	av->latick = ambclock;
482		/*
483	<	*  Ray strength test.
483	>	*  Ambient level test
484		*/
485	<	if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY)
485	>	if (av->lvl > al ||     /* list sorted, so this works */
486	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
487	>	break;
488	>	/*
489	>	*  Direction test using unperturbed normal
490	>	*/
491	>	decodedir(uvw[2], av->ndir);
492	>	d = DOT(uvw[2], r->ron);
493	>	if (d <= 0.0)           /* >= 90 degrees */
494		continue;
495	+	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
496	+	if (delta_r2 >= maxangle*maxangle)
497	+	continue;
498		/*
499	<	*  Ambient radius test.
499	>	*  Modified ray behind test
500		*/
501	<	e1 = 0.0;
502	<	for (j = 0; j < 3; j++) {
503	<	d = av->pos[j] - r->rop[j];
197	<	e1 += d * d;
198	<	}
199	<	e1 /= av->rad * av->rad;
200	<	if (e1 > ambacc*ambacc*1.21)
501	>	VSUB(ck0, r->rop, av->pos);
502	>	d = DOT(ck0, uvw[2]);
503	>	if (d < -minarad*ambacc-.001)
504		continue;
505	+	d /= av->rad[0];
506	+	delta_t2 = d*d;
507	+	if (delta_t2 >= ambacc*ambacc)
508	+	continue;
509		/*
510	<	*  Normal direction test.
510	>	*  Elliptical radii test based on Hessian
511		*/
512	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
513	<	if (e2 < 0.0) e2 = 0.0;
514	<	if (e1 + e2 > ambacc*ambacc*1.21)
512	>	decodedir(uvw[0], av->udir);
513	>	VCROSS(uvw[1], uvw[2], uvw[0]);
514	>	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
515	>	delta_t2 += d*d;
516	>	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
517	>	delta_t2 += d*d;
518	>	if (delta_t2 >= ambacc*ambacc)
519		continue;
520		/*
521	<	*  Ray behind test.
521	>	*  Test for potential light leak
522		*/
523	<	d = 0.0;
213	<	for (j = 0; j < 3; j++)
214	<	d += (r->rop[j] - av->pos[j]) *
215	<	(av->dir[j] + r->ron[j]);
216	<	if (d*0.5 < -minarad*ambacc)
523	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
524		continue;
525		/*
526	<	*  Jittering final test reduces image artifacts.
526	>	*  Extrapolate value and compute final weight (hat function)
527		*/
528	<	wt = sqrt(e1) + sqrt(e2);
222	<	wt *= .9 + .2*frandom();
223	<	if (wt > ambacc)
528	>	if (!extambient(ct, av, r->rop, rn, uvw))
529		continue;
530	<	if (wt <= 1e-3)
531	<	wt = 1e3;
532	<	else
228	<	wt = 1.0 / wt;
229	<	wsum += wt;
230	<	copycolor(ct, av->val);
231	<	scalecolor(ct, wt);
530	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
531	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
532	>	scalecolor(ct, d);
533		addcolor(acol, ct);
534	+	wsum += d;
535		}
234	–	if (at->kid == NULL)
235	–	return(wsum);
236	–	/* do children */
237	–	s *= 0.5;
238	–	for (i = 0; i < 8; i++) {
239	–	for (j = 0; j < 3; j++) {
240	–	ck0[j] = c0[j];
241	–	if (1<<j & i)
242	–	ck0[j] += s;
243	–	if (r->rop[j] < ck0[j] - OCTSCALE*s)
244	–	break;
245	–	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
246	–	break;
247	–	}
248	–	if (j == 3)
249	–	wsum += sumambient(acol, r, at->kid+i, ck0, s);
250	–	}
536		return(wsum);
537		}
538
539
540	<	double
541	<	makeambient(acol, r)            /* make a new ambient value */
542	<	COLOR  acol;
543	<	register RAY  *r;
540	>	static int
541	>	makeambient(            /* make a new ambient value for storage */
542	>	COLOR  acol,
543	>	RAY  *r,
544	>	FVECT  rn,
545	>	int  al
546	>	)
547		{
548	<	AMBVAL  amb;
548	>	AMBVAL  amb;
549	>	FVECT   uvw[3];
550	>	int     i;
551
552	<	amb.rad = doambient(acol, r);           /* compute ambient */
553	<	if (amb.rad == 0.0)
554	<	return(0.0);
555	<	/* store it */
552	>	amb.weight = 1.0;                       /* compute weight */
553	>	for (i = al; i-- > 0; )
554	>	amb.weight *= AVGREFL;
555	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
556	>	amb.weight = 1.25*r->rweight;
557	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
558	>	/* compute ambient */
559	>	i = doambient(acol, r, amb.weight,
560	>	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
561	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
562	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
563	>	return(i);
564	>	/* store value */
565		VCOPY(amb.pos, r->rop);
566	<	VCOPY(amb.dir, r->ron);
567	<	amb.lvl = r->rlvl;
568	<	amb.weight = r->rweight;
566	>	amb.ndir = encodedir(r->ron);
567	>	amb.udir = encodedir(uvw[0]);
568	>	amb.lvl = al;
569		copycolor(amb.val, acol);
570		/* insert into tree */
571	<	avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize);
572	<	avsave(&amb);                           /* write to file */
573	<	return(amb.rad);
571	>	avsave(&amb);                           /* and save to file */
572	>	if (rn != r->ron) {                     /* texture */
573	>	VCOPY(uvw[2], r->ron);
574	>	extambient(acol, &amb, r->rop, rn, uvw);
575	>	}
576	>	return(1);
577		}
578
579
580	<	double
581	<	doambient(acol, r)                      /* compute ambient component */
582	<	COLOR  acol;
583	<	register RAY  *r;
580	>	static int
581	>	extambient(             /* extrapolate value at pv, nv */
582	>	COLOR  cr,
583	>	AMBVAL   *ap,
584	>	FVECT  pv,
585	>	FVECT  nv,
586	>	FVECT  uvw[3]
587	>	)
588		{
589	<	extern int  ambcmp();
590	<	extern double  sin(), cos(), sqrt();
591	<	int  hlist[4];
592	<	double  phi, xd, yd, zd;
593	<	double  b, b2;
594	<	register AMBSAMP  *div;
289	<	AMBSAMP  dnew;
290	<	RAY  ar;
291	<	FVECT  ux, uy;
292	<	double  arad;
293	<	int  ndivs, nt, np, ns, ne, i, j;
294	<	register int  k;
589	>	const double    min_d = 0.05;
590	>	const double    max_d = 20.;
591	>	static FVECT    my_uvw[3];
592	>	FVECT           v1;
593	>	int             i;
594	>	double          d = 1.0;        /* zeroeth order */
595
596	<	setcolor(acol, 0.0, 0.0, 0.0);
597	<	/* set number of divisions */
598	<	nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5;
599	<	np = 2 * nt;
600	<	ndivs = nt * np;
301	<	/* check first */
302	<	if (ndivs == 0 || rayorigin(&ar, r, AMBIENT, 0.5) < 0)
303	<	return(0.0);
304	<	/* set number of super-samples */
305	<	ns = ambssamp * r->rweight + 0.5;
306	<	if (ns > 0) {
307	<	div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP));
308	<	if (div == NULL)
309	<	error(SYSTEM, "out of memory in doambient");
310	<	} else
311	<	div = NULL;
312	<	/* make axes */
313	<	uy[0] = uy[1] = uy[2] = 0.0;
314	<	for (k = 0; k < 3; k++)
315	<	if (r->ron[k] < 0.6 && r->ron[k] > -0.6)
316	<	break;
317	<	uy[k] = 1.0;
318	<	fcross(ux, r->ron, uy);
319	<	normalize(ux);
320	<	fcross(uy, ux, r->ron);
321	<	/* set up urand */
322	<	hlist[0] = r->rno;
323	<	/* sample divisions */
324	<	arad = 0.0;
325	<	ne = 0;
326	<	for (i = 0; i < nt; i++) {
327	<	hlist[1] = i;
328	<	for (j = 0; j < np; j++) {
329	<	rayorigin(&ar, r, AMBIENT, 0.5);        /* pretested */
330	<	hlist[2] = j;
331	<	hlist[3] = 0;
332	<	zd = sqrt((i+urand(ilhash(hlist,4)))/nt);
333	<	hlist[3] = 1;
334	<	phi = 2.0*PI * (j+urand(ilhash(hlist,4)))/np;
335	<	xd = cos(phi) * zd;
336	<	yd = sin(phi) * zd;
337	<	zd = sqrt(1.0 - zd*zd);
338	<	for (k = 0; k < 3; k++)
339	<	ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k];
340	<	dimlist[ndims++] = i*np + j + 38813;
341	<	rayvalue(&ar);
342	<	ndims--;
343	<	if (ar.rot < FHUGE)
344	<	arad += 1.0 / ar.rot;
345	<	if (div != NULL) {              /* save division */
346	<	div[ne].k = 0.0;
347	<	copycolor(div[ne].v, ar.rcol);
348	<	div[ne].n = 0;
349	<	div[ne].t = i; div[ne].p = j;
350	<	/* sum errors */
351	<	b = bright(ar.rcol);
352	<	if (i > 0) {            /* from above */
353	<	b2 = bright(div[ne-np].v) - b;
354	<	b2 *= b2 * 0.25;
355	<	div[ne].k += b2;
356	<	div[ne].n++;
357	<	div[ne-np].k += b2;
358	<	div[ne-np].n++;
359	<	}
360	<	if (j > 0) {            /* from behind */
361	<	b2 = bright(div[ne-1].v) - b;
362	<	b2 *= b2 * 0.25;
363	<	div[ne].k += b2;
364	<	div[ne].n++;
365	<	div[ne-1].k += b2;
366	<	div[ne-1].n++;
367	<	}
368	<	if (j == np-1) {        /* around */
369	<	b2 = bright(div[ne-(np-1)].v) - b;
370	<	b2 *= b2 * 0.25;
371	<	div[ne].k += b2;
372	<	div[ne].n++;
373	<	div[ne-(np-1)].k += b2;
374	<	div[ne-(np-1)].n++;
375	<	}
376	<	ne++;
377	<	} else
378	<	addcolor(acol, ar.rcol);
379	<	}
596	>	if (uvw == NULL) {              /* need local coordinates? */
597	>	decodedir(my_uvw[2], ap->ndir);
598	>	decodedir(my_uvw[0], ap->udir);
599	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
600	>	uvw = my_uvw;
601		}
602	<	for (k = 0; k < ne; k++) {              /* compute errors */
603	<	if (div[k].n > 1)
604	<	div[k].k /= div[k].n;
384	<	div[k].n = 1;
385	<	}
386	<	/* sort the divisions */
387	<	qsort(div, ne, sizeof(AMBSAMP), ambcmp);
388	<	/* skim excess */
389	<	while (ne > ns) {
390	<	ne--;
391	<	addcolor(acol, div[ne].v);
392	<	}
393	<	/* super-sample */
394	<	for (i = ns; i > 0; i--) {
395	<	rayorigin(&ar, r, AMBIENT, 0.5);        /* pretested */
396	<	hlist[1] = div[0].t;
397	<	hlist[2] = div[0].p;
398	<	hlist[3] = 0;
399	<	zd = sqrt((div[0].t+urand(ilhash(hlist,4)+div[0].n))/nt);
400	<	hlist[3] = 1;
401	<	phi = 2.0*PI * (div[0].p+urand(ilhash(hlist,4)+div[0].n))/np;
402	<	xd = cos(phi) * zd;
403	<	yd = sin(phi) * zd;
404	<	zd = sqrt(1.0 - zd*zd);
405	<	for (k = 0; k < 3; k++)
406	<	ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k];
407	<	dimlist[ndims++] = div[0].t*np + div[0].p + 38813;
408	<	rayvalue(&ar);
409	<	ndims--;
410	<	rayvalue(&ar);
411	<	if (ar.rot < FHUGE)
412	<	arad += 1.0 / ar.rot;
413	<	/* recompute error */
414	<	copycolor(dnew.v, div[0].v);
415	<	addcolor(dnew.v, ar.rcol);
416	<	dnew.n = div[0].n + 1;
417	<	dnew.t = div[0].t; dnew.p = div[0].p;
418	<	b2 = bright(dnew.v)/dnew.n - bright(ar.rcol);
419	<	b2 = b2*b2 + div[0].k*(div[0].n*div[0].n);
420	<	dnew.k = b2/(dnew.n*dnew.n);
421	<	/* reinsert */
422	<	for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++)
423	<	copystruct(&div[k], &div[k+1]);
424	<	copystruct(&div[k], &dnew);
602	>	for (i = 3; i--; )              /* gradient due to translation */
603	>	d += (pv[i] - ap->pos[i]) *
604	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
605
606	<	if (ne >= i) {          /* extract darkest division */
607	<	ne--;
608	<	if (div[ne].n > 1) {
609	<	b = 1.0/div[ne].n;
610	<	scalecolor(div[ne].v, b);
611	<	div[ne].n = 1;
606	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
607	>	for (i = 3; i--; )
608	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
609	>
610	>	if (d < min_d)                  /* clamp min/max scaling */
611	>	d = min_d;
612	>	else if (d > max_d)
613	>	d = max_d;
614	>	copycolor(cr, ap->val);
615	>	scalecolor(cr, d);
616	>	return(d > min_d);
617	>	}
618	>
619	>
620	>	static void
621	>	avinsert(                               /* insert ambient value in our tree */
622	>	AMBVAL *av
623	>	)
624	>	{
625	>	AMBTREE  *at;
626	>	AMBVAL  *ap;
627	>	AMBVAL  avh;
628	>	FVECT  ck0;
629	>	double  s;
630	>	int  branch;
631	>	int  i;
632	>
633	>	if (av->rad[0] <= FTINY)
634	>	error(CONSISTENCY, "zero ambient radius in avinsert");
635	>	at = &atrunk;
636	>	VCOPY(ck0, thescene.cuorg);
637	>	s = thescene.cusize;
638	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
639	>	if (at->kid == NULL)
640	>	if ((at->kid = newambtree()) == NULL)
641	>	error(SYSTEM, "out of memory in avinsert");
642	>	s *= 0.5;
643	>	branch = 0;
644	>	for (i = 0; i < 3; i++)
645	>	if (av->pos[i] > ck0[i] + s) {
646	>	ck0[i] += s;
647	>	branch |= 1 << i;
648		}
649	<	addcolor(acol, div[ne].v);
434	<	}
649	>	at = at->kid + branch;
650		}
651	<	scalecolor(acol, 1.0/ndivs);
652	<	if (arad <= FTINY)
653	<	arad = FHUGE;
654	<	else
655	<	arad = (ndivs+ns) / arad / sqrt(r->rweight);
656	<	if (arad > maxarad)
657	<	arad = maxarad;
658	<	else if (arad < minarad)
659	<	arad = minarad;
445	<	if (div != NULL)
446	<	free((char *)div);
447	<	return(arad);
651	>	avh.next = at->alist;           /* order by increasing level */
652	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
653	>	if ( ap->next->lvl > av->lvl ||
654	>	(ap->next->lvl == av->lvl) &
655	>	(ap->next->weight <= av->weight) )
656	>	break;
657	>	av->next = ap->next;
658	>	ap->next = (AMBVAL*)av;
659	>	at->alist = avh.next;
660		}
661
662
663	<	static int
664	<	ambcmp(d1, d2)                          /* decreasing order */
665	<	AMBSAMP  *d1, *d2;
663	>	static void
664	>	initambfile(            /* initialize ambient file */
665	>	int  cre8
666	>	)
667		{
668	<	if (d1->k < d2->k)
669	<	return(1);
670	<	if (d1->k > d2->k)
671	<	return(-1);
672	<	return(0);
668	>	extern char  *progname, *octname;
669	>	static char  *mybuf = NULL;
670	>
671	>	#ifdef  F_SETLKW
672	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
673	>	#endif
674	>	SET_FILE_BINARY(ambfp);
675	>	if (mybuf == NULL)
676	>	mybuf = (char *)bmalloc(BUFSIZ+8);
677	>	setbuf(ambfp, mybuf);
678	>	if (cre8) {                     /* new file */
679	>	newheader("RADIANCE", ambfp);
680	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
681	>	progname, colval(ambval,RED),
682	>	colval(ambval,GRN), colval(ambval,BLU),
683	>	ambvwt, ambounce, ambacc);
684	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
685	>	ambdiv, ambssamp, ambres);
686	>	if (octname != NULL)
687	>	fputs(octname, ambfp);
688	>	fputc('\n', ambfp);
689	>	fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
690	>	fputnow(ambfp);
691	>	fputformat(AMBFMT, ambfp);
692	>	fputc('\n', ambfp);
693	>	putambmagic(ambfp);
694	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
695	>	error(USER, "bad ambient file");
696		}
697
698
699	<	static
700	<	avsave(av)                              /* save an ambient value */
701	<	AMBVAL  *av;
699	>	static void
700	>	avsave(                         /* insert and save an ambient value */
701	>	AMBVAL  *av
702	>	)
703		{
704	<	#ifdef  AMBFLUSH
468	<	static int  nunflshed = 0;
469	<	#endif
704	>	avstore(av);
705		if (ambfp == NULL)
706		return;
707	<	if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1)
707	>	if (writambval(av, ambfp) < 0)
708		goto writerr;
709	<	#ifdef  AMBFLUSH
710	<	if (++nunflshed >= AMBFLUSH) {
476	<	if (fflush(ambfp) == EOF)
709	>	if (++nunflshed >= AMBFLUSH)
710	>	if (ambsync() == EOF)
711		goto writerr;
478	–	nunflshed = 0;
479	–	}
480	–	#endif
712		return;
713		writerr:
714	<	error(SYSTEM, "error writing ambient file");
714	>	error(SYSTEM, "error writing to ambient file");
715		}
716
717
718	<	static
719	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
720	<	AMBVAL  *aval;
721	<	register AMBTREE  *at;
491	<	FVECT  c0;
492	<	double  s;
718	>	static AMBVAL *
719	>	avstore(                                /* allocate memory and save aval */
720	>	AMBVAL  *aval
721	>	)
722		{
723	<	FVECT  ck0;
724	<	int  branch;
496	<	register AMBVAL  *av;
497	<	register int  i;
723	>	AMBVAL  *av;
724	>	double  d;
725
726		if ((av = newambval()) == NULL)
727	<	goto memerr;
728	<	copystruct(av, aval);
729	<	VCOPY(ck0, c0);
730	<	while (s*(OCTSCALE/2) > av->rad*ambacc) {
731	<	if (at->kid == NULL)
732	<	if ((at->kid = newambtree()) == NULL)
733	<	goto memerr;
734	<	s *= 0.5;
735	<	branch = 0;
736	<	for (i = 0; i < 3; i++)
737	<	if (av->pos[i] > ck0[i] + s) {
738	<	ck0[i] += s;
739	<	branch |= 1 << i;
727	>	error(SYSTEM, "out of memory in avstore");
728	>	*av = *aval;
729	>	av->latick = ambclock;
730	>	av->next = NULL;
731	>	nambvals++;
732	>	d = bright(av->val);
733	>	if (d > FTINY) {                /* add to log sum for averaging */
734	>	avsum += log(d);
735	>	navsum++;
736	>	}
737	>	avinsert(av);                   /* insert in our cache tree */
738	>	return(av);
739	>	}
740	>
741	>
742	>	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
743	>
744	>	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
745	>
746	>
747	>	static AMBTREE *
748	>	newambtree(void)                                /* allocate 8 ambient tree structs */
749	>	{
750	>	AMBTREE  *atp, *upperlim;
751	>
752	>	if (atfreelist == NULL) {       /* get more nodes */
753	>	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
754	>	if (atfreelist == NULL)
755	>	return(NULL);
756	>	/* link new free list */
757	>	upperlim = atfreelist + 8*(ATALLOCSZ-1);
758	>	for (atp = atfreelist; atp < upperlim; atp += 8)
759	>	atp->kid = atp + 8;
760	>	atp->kid = NULL;
761	>	}
762	>	atp = atfreelist;
763	>	atfreelist = atp->kid;
764	>	memset(atp, 0, 8*sizeof(AMBTREE));
765	>	return(atp);
766	>	}
767	>
768	>
769	>	static void
770	>	freeambtree(                    /* free 8 ambient tree structs */
771	>	AMBTREE  *atp
772	>	)
773	>	{
774	>	atp->kid = atfreelist;
775	>	atfreelist = atp;
776	>	}
777	>
778	>
779	>	static void
780	>	unloadatree(                    /* unload an ambient value tree */
781	>	AMBTREE  *at,
782	>	unloadtf_t *f
783	>	)
784	>	{
785	>	AMBVAL  *av;
786	>	int  i;
787	>	/* transfer values at this node */
788	>	for (av = at->alist; av != NULL; av = at->alist) {
789	>	at->alist = av->next;
790	>	av->next = NULL;
791	>	(*f)(av);
792	>	}
793	>	if (at->kid == NULL)
794	>	return;
795	>	for (i = 0; i < 8; i++)         /* transfer and free children */
796	>	unloadatree(at->kid+i, f);
797	>	freeambtree(at->kid);
798	>	at->kid = NULL;
799	>	}
800	>
801	>
802	>	static struct avl {
803	>	AMBVAL  *p;
804	>	unsigned long   t;
805	>	}       *avlist1;                       /* ambient value list with ticks */
806	>	static AMBVAL   **avlist2;              /* memory positions for sorting */
807	>	static int      i_avlist;               /* index for lists */
808	>
809	>	static int alatcmp(const void *av1, const void *av2);
810	>
811	>	static void
812	>	avfree(AMBVAL *av)
813	>	{
814	>	free(av);
815	>	}
816	>
817	>	static void
818	>	av2list(
819	>	AMBVAL *av
820	>	)
821	>	{
822	>	#ifdef DEBUG
823	>	if (i_avlist >= nambvals)
824	>	error(CONSISTENCY, "too many ambient values in av2list1");
825	>	#endif
826	>	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
827	>	avlist1[i_avlist++].t = av->latick;
828	>	}
829	>
830	>
831	>	static int
832	>	alatcmp(                        /* compare ambient values for MRA */
833	>	const void *av1,
834	>	const void *av2
835	>	)
836	>	{
837	>	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
838	>	return(lc<0 ? -1 : lc>0 ? 1 : 0);
839	>	}
840	>
841	>
842	>	/* GW NOTE 2002/10/3:
843	>	* I used to compare AMBVAL pointers, but found that this was the
844	>	* cause of a serious consistency error with gcc, since the optimizer
845	>	* uses some dangerous trick in pointer subtraction that
846	>	* assumes pointers differ by exact struct size increments.
847	>	*/
848	>	static int
849	>	aposcmp(                        /* compare ambient value positions */
850	>	const void      *avp1,
851	>	const void      *avp2
852	>	)
853	>	{
854	>	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
855	>	if (diff < 0)
856	>	return(-1);
857	>	return(diff > 0);
858	>	}
859	>
860	>
861	>	static int
862	>	avlmemi(                                /* find list position from address */
863	>	AMBVAL  *avaddr
864	>	)
865	>	{
866	>	AMBVAL  **avlpp;
867	>
868	>	avlpp = (AMBVAL **)bsearch(&avaddr, avlist2,
869	>	nambvals, sizeof(AMBVAL *), aposcmp);
870	>	if (avlpp == NULL)
871	>	error(CONSISTENCY, "address not found in avlmemi");
872	>	return(avlpp - avlist2);
873	>	}
874	>
875	>
876	>	static void
877	>	sortambvals(                    /* resort ambient values */
878	>	int     always
879	>	)
880	>	{
881	>	AMBTREE  oldatrunk;
882	>	AMBVAL  tav, *tap, *pnext;
883	>	int     i, j;
884	>	/* see if it's time yet */
885	>	if (!always && (ambclock++ < lastsort+sortintvl ||
886	>	nambvals < SORT_THRESH))
887	>	return;
888	>	/*
889	>	* The idea here is to minimize memory thrashing
890	>	* in VM systems by improving reference locality.
891	>	* We do this by periodically sorting our stored ambient
892	>	* values in memory in order of most recently to least
893	>	* recently accessed.  This ordering was chosen so that new
894	>	* ambient values (which tend to be less important) go into
895	>	* higher memory with the infrequently accessed values.
896	>	*      Since we expect our values to need sorting less
897	>	* frequently as the process continues, we double our
898	>	* waiting interval after each call.
899	>	*      This routine is also called by setambacc() with
900	>	* the "always" parameter set to 1 so that the ambient
901	>	* tree will be rebuilt with the new accuracy parameter.
902	>	*/
903	>	if (tracktime) {                /* allocate pointer arrays to sort */
904	>	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
905	>	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
906	>	} else {
907	>	avlist2 = NULL;
908	>	avlist1 = NULL;
909	>	}
910	>	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
911	>	if (avlist2 != NULL)
912	>	free(avlist2);
913	>	if (always) {           /* rebuild without sorting */
914	>	oldatrunk = atrunk;
915	>	atrunk.alist = NULL;
916	>	atrunk.kid = NULL;
917	>	unloadatree(&oldatrunk, avinsert);
918	>	}
919	>	} else {                        /* sort memory by last access time */
920	>	/*
921	>	* Sorting memory is tricky because it isn't contiguous.
922	>	* We have to sort an array of pointers by MRA and also
923	>	* by memory position.  We then copy values in "loops"
924	>	* to minimize memory hits.  Nevertheless, we will visit
925	>	* everyone at least twice, and this is an expensive process
926	>	* when we're thrashing, which is when we need to do it.
927	>	*/
928	>	#ifdef DEBUG
929	>	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
930	>	nambvals, ambclock);
931	>	eputs(errmsg);
932	>	#endif
933	>	i_avlist = 0;
934	>	unloadatree(&atrunk, av2list);  /* empty current tree */
935	>	#ifdef DEBUG
936	>	if (i_avlist < nambvals)
937	>	error(CONSISTENCY, "missing ambient values in sortambvals");
938	>	#endif
939	>	qsort(avlist1, nambvals, sizeof(struct avl), alatcmp);
940	>	qsort(avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
941	>	for (i = 0; i < nambvals; i++) {
942	>	if (avlist1[i].p == NULL)
943	>	continue;
944	>	tap = avlist2[i];
945	>	tav = *tap;
946	>	for (j = i; (pnext = avlist1[j].p) != tap;
947	>	j = avlmemi(pnext)) {
948	>	*(avlist2[j]) = *pnext;
949	>	avinsert(avlist2[j]);
950	>	avlist1[j].p = NULL;
951		}
952	<	at = at->kid + branch;
952	>	*(avlist2[j]) = tav;
953	>	avinsert(avlist2[j]);
954	>	avlist1[j].p = NULL;
955	>	}
956	>	free(avlist1);
957	>	free(avlist2);
958	>	/* compute new sort interval */
959	>	sortintvl = ambclock - lastsort;
960	>	if (sortintvl >= MAX_SORT_INTVL/2)
961	>	sortintvl = MAX_SORT_INTVL;
962	>	else
963	>	sortintvl <<= 1;        /* wait twice as long next */
964	>	#ifdef DEBUG
965	>	eputs("done\n");
966	>	#endif
967		}
968	<	av->next = at->alist;
969	<	at->alist = av;
970	<	return;
519	<	memerr:
520	<	error(SYSTEM, "out of memory in avinsert");
968	>	if (ambclock >= MAXACLOCK)
969	>	ambclock = MAXACLOCK/2;
970	>	lastsort = ambclock;
971		}
972	+
973	+
974	+	#ifdef  F_SETLKW
975	+
976	+	static void
977	+	aflock(                 /* lock/unlock ambient file */
978	+	int  typ
979	+	)
980	+	{
981	+	static struct flock  fls;       /* static so initialized to zeroes */
982	+
983	+	if (typ == fls.l_type)          /* already called? */
984	+	return;
985	+
986	+	fls.l_type = typ;
987	+	do
988	+	if (fcntl(fileno(ambfp), F_SETLKW, &fls) != -1)
989	+	return;
990	+	while (errno == EINTR);
991	+
992	+	error(SYSTEM, "cannot (un)lock ambient file");
993	+	}
994	+
995	+
996	+	int
997	+	ambsync(void)                   /* synchronize ambient file */
998	+	{
999	+	long  flen;
1000	+	AMBVAL  avs;
1001	+	int  n;
1002	+
1003	+	if (ambfp == NULL)      /* no ambient file? */
1004	+	return(0);
1005	+	/* gain appropriate access */
1006	+	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1007	+	/* see if file has grown */
1008	+	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1009	+	goto seekerr;
1010	+	if ((n = flen - lastpos) > 0) {         /* file has grown */
1011	+	if (ambinp == NULL) {           /* get new file pointer */
1012	+	ambinp = fopen(ambfile, "rb");
1013	+	if (ambinp == NULL)
1014	+	error(SYSTEM, "fopen failed in ambsync");
1015	+	}
1016	+	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1017	+	goto seekerr;
1018	+	while (n >= AMBVALSIZ) {        /* load contributed values */
1019	+	if (!readambval(&avs, ambinp)) {
1020	+	sprintf(errmsg,
1021	+	"ambient file \"%s\" corrupted near character %ld",
1022	+	ambfile, flen - n);
1023	+	error(WARNING, errmsg);
1024	+	break;
1025	+	}
1026	+	avstore(&avs);
1027	+	n -= AMBVALSIZ;
1028	+	}
1029	+	lastpos = flen - n;             /* check alignment */
1030	+	if (n && lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1031	+	goto seekerr;
1032	+	}
1033	+	n = fflush(ambfp);                      /* calls write() at last */
1034	+	lastpos += (long)nunflshed*AMBVALSIZ;
1035	+	aflock(F_UNLCK);                        /* release file */
1036	+	nunflshed = 0;
1037	+	return(n);
1038	+	seekerr:
1039	+	error(SYSTEM, "seek failed in ambsync");
1040	+	return(EOF);    /* pro forma return */
1041	+	}
1042	+
1043	+	#else   /* ! F_SETLKW */
1044	+
1045	+	int
1046	+	ambsync(void)                   /* flush ambient file */
1047	+	{
1048	+	if (ambfp == NULL)
1049	+	return(0);
1050	+	nunflshed = 0;
1051	+	return(fflush(ambfp));
1052	+	}
1053	+
1054	+	#endif  /* ! F_SETLKW */

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