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

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.16 by greg, Fri Jan 22 09:51:13 1993 UTC vs.
Revision 2.102 by greg, Sun Apr 24 16:21:32 2016 UTC

#	Line 1 | Line 1
1	<	/* Copyright (c) 1993 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	+	*  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"
18	–
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 {
24	<	AMBVAL  *alist;         /* ambient value list */
25	<	struct ambtree  *kid;   /* 8 child nodes */
26	<	}  AMBTREE;                     /* ambient octree */
24	>	extern char  *shm_boundary;     /* memory sharing boundary */
25
26	<	extern CUBE  thescene;          /* contains space boundaries */
27	<
28	<	#define  MAXASET        511     /* maximum number of elements in ambient set */
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		double  maxarad;                /* maximum ambient radius */
#	Line 35 | Line 33 | double minarad;                /* minimum ambient radius */
33
34		static AMBTREE  atrunk;         /* our ambient trunk node */
35
38	–	static char  *ambfname = NULL;  /* ambient file name */
36		static FILE  *ambfp = NULL;     /* ambient file pointer */
37		static int  nunflshed = 0;      /* number of unflushed ambient values */
38
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	+
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	+	#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 *)bmalloc(sizeof(AMBVAL))
78	>	#define  newambval()    (AMBVAL *)malloc(sizeof(AMBVAL))
79
80	<	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
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	<	extern long  ftell(), lseek();
87	<	static int  initambfile(), avsave(), avinsert();
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	<	setambres(ar)                           /* set ambient resolution */
97	<	int  ar;
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	<	long  headlen;
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 ((ambfname = afile) != NULL) {
161	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
162	<	initambfile(0);
163	<	headlen = ftell(ambfp);
164	<	while (readambval(&amb, ambfp))
165	<	avinsert(&amb, &atrunk, thescene.cuorg,
166	<	thescene.cusize);
167	<	/* align */
168	<	fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1);
169	<	} else if ((ambfp = fopen(afile, "w+")) != NULL)
170	<	initambfile(1);
171	<	else {
172	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
173	<	afile);
174	<	error(SYSTEM, errmsg);
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	<	nunflshed++;    /* lie */
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	>	void
203	>	ambdone(void)                   /* close ambient file and free memory */
204	>	{
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 118 | 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     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 137 | Line 302 | register RAY  *r;
302		goto dumbamb;
303
304		if (ambacc <= FTINY) {                  /* no ambient storage */
305	+	copycolor(acol, aval);
306		rdepth++;
307	<	d = doambient(acol, r, r->rweight, NULL, NULL);
307	>	ok = doambient(acol, r, r->rweight,
308	>	NULL, NULL, NULL, NULL, NULL);
309		rdepth--;
310	<	if (d == 0.0)
310	>	if (!ok)
311		goto dumbamb;
312	+	copycolor(aval, acol);
313	+
314	+	/* PMAP: add in caustic */
315	+	addcolor(aval, caustic);
316		return;
317		}
318	<	/* get ambient value */
318	>
319	>	if (tracktime)                          /* sort to minimize thrashing */
320	>	sortambvals(0);
321	>	/* interpolate ambient value */
322		setcolor(acol, 0.0, 0.0, 0.0);
323	<	d = sumambient(acol, r, rdepth,
323	>	d = sumambient(acol, r, nrm, rdepth,
324		&atrunk, thescene.cuorg, thescene.cusize);
325	<	if (d > FTINY)
326	<	scalecolor(acol, 1.0/d);
327	<	else {
328	<	d = makeambient(acol, r, rdepth++);
325	>
326	>	if (d > FTINY) {
327	>	d = 1.0/d;
328	>	scalecolor(acol, d);
329	>	multcolor(aval, acol);
330	>
331	>	/* PMAP: add in caustic */
332	>	addcolor(aval, caustic);
333	>	return;
334	>	}
335	>
336	>	rdepth++;                               /* need to cache new value */
337	>	ok = makeambient(acol, r, nrm, rdepth-1);
338	>	rdepth--;
339	>
340	>	if (ok) {
341	>	multcolor(aval, acol);          /* computed new value */
342	>
343	>	/* PMAP: add in caustic */
344	>	addcolor(aval, caustic);
345	>	return;
346	>	}
347	>
348	>	dumbamb:                                        /* return global value */
349	>	if ((ambvwt <= 0) | (navsum == 0)) {
350	>	multcolor(aval, ambval);
351	>
352	>	/* PMAP: add in caustic */
353	>	addcolor(aval, caustic);
354	>	return;
355	>	}
356	>
357	>	l = bright(ambval);                     /* average in computations */
358	>	if (l > FTINY) {
359	>	d = (log(l)*(double)ambvwt + avsum) /
360	>	(double)(ambvwt + navsum);
361	>	d = exp(d) / l;
362	>	scalecolor(aval, d);
363	>	multcolor(aval, ambval);        /* apply color of ambval */
364	>	} else {
365	>	d = exp( avsum / (double)navsum );
366	>	scalecolor(aval, d);            /* neutral color */
367	>	}
368	>	}
369	>
370	>
371	>	/* Plug a potential leak where ambient cache value is occluded */
372	>	static int
373	>	plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
374	>	{
375	>	const double    cost70sq = 0.1169778;   /* cos(70deg)^2 */
376	>	RAY             rtst;
377	>	FVECT           vdif;
378	>	double          normdot, ndotd, nadotd;
379	>	double          a, b, c, t[2];
380	>
381	>	ang += 2.*PI*(ang < 0);                 /* check direction flags */
382	>	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
383	>	return(0);
384	>	/*
385	>	* Generate test ray, targeting 20 degrees above sample point plane
386	>	* along surface normal from cache position.  This should be high
387	>	* enough to miss local geometry we don't really care about.
388	>	*/
389	>	VSUB(vdif, ap->pos, r->rop);
390	>	normdot = DOT(anorm, r->ron);
391	>	ndotd = DOT(vdif, r->ron);
392	>	nadotd = DOT(vdif, anorm);
393	>	a = normdot*normdot - cost70sq;
394	>	b = 2.0*(normdot*ndotd - nadotd*cost70sq);
395	>	c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq;
396	>	if (quadratic(t, a, b, c) != 2)
397	>	return(1);                      /* should rarely happen */
398	>	if (t[1] <= FTINY)
399	>	return(0);                      /* should fail behind test */
400	>	rayorigin(&rtst, SHADOW, r, NULL);
401	>	VSUM(rtst.rdir, vdif, anorm, t[1]);     /* further dist. > plane */
402	>	rtst.rmax = normalize(rtst.rdir);       /* short ray test */
403	>	while (localhit(&rtst, &thescene)) {    /* check for occluder */
404	>	if (rtst.ro->omod != OVOID &&
405	>	(rtst.clipset == NULL ||
406	>	!inset(rtst.clipset, rtst.ro->omod)))
407	>	return(1);              /* plug light leak */
408	>	VCOPY(rtst.rorg, rtst.rop);     /* skip invisible surface */
409	>	rtst.rmax -= rtst.rot;
410	>	rayclear(&rtst);
411	>	}
412	>	return(0);                              /* seems we're OK */
413	>	}
414	>
415	>
416	>	static double
417	>	sumambient(             /* get interpolated ambient value */
418	>	COLOR  acol,
419	>	RAY  *r,
420	>	FVECT  rn,
421	>	int  al,
422	>	AMBTREE  *at,
423	>	FVECT  c0,
424	>	double  s
425	>	)
426	>	{                       /* initial limit is 10 degrees plus ambacc radians */
427	>	const double    minangle = 10.0 * PI/180.;
428	>	double          maxangle = minangle + ambacc;
429	>	double          wsum = 0.0;
430	>	FVECT           ck0;
431	>	int             i, j;
432	>	AMBVAL          *av;
433	>
434	>	if (at->kid != NULL) {          /* sum children first */
435	>	s *= 0.5;
436	>	for (i = 0; i < 8; i++) {
437	>	for (j = 0; j < 3; j++) {
438	>	ck0[j] = c0[j];
439	>	if (1<<j & i)
440	>	ck0[j] += s;
441	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
442	>	break;
443	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
444	>	break;
445	>	}
446	>	if (j == 3)
447	>	wsum += sumambient(acol, r, rn, al,
448	>	at->kid+i, ck0, s);
449	>	}
450	>	/* good enough? */
451	>	if (wsum >= 0.05 && s > minarad*10.0)
452	>	return(wsum);
453	>	}
454	>	/* adjust maximum angle */
455	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
456	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
457	>	/* sum this node */
458	>	for (av = at->alist; av != NULL; av = av->next) {
459	>	double  u, v, d, delta_r2, delta_t2;
460	>	COLOR   ct;
461	>	FVECT   uvw[3];
462	>	/* record access */
463	>	if (tracktime)
464	>	av->latick = ambclock;
465	>	/*
466	>	*  Ambient level test
467	>	*/
468	>	if (av->lvl > al ||     /* list sorted, so this works */
469	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
470	>	break;
471	>	/*
472	>	*  Direction test using unperturbed normal
473	>	*/
474	>	decodedir(uvw[2], av->ndir);
475	>	d = DOT(uvw[2], r->ron);
476	>	if (d <= 0.0)           /* >= 90 degrees */
477	>	continue;
478	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
479	>	if (delta_r2 >= maxangle*maxangle)
480	>	continue;
481	>	/*
482	>	*  Modified ray behind test
483	>	*/
484	>	VSUB(ck0, r->rop, av->pos);
485	>	d = DOT(ck0, uvw[2]);
486	>	if (d < -minarad*ambacc-.001)
487	>	continue;
488	>	d /= av->rad[0];
489	>	delta_t2 = d*d;
490	>	if (delta_t2 >= ambacc*ambacc)
491	>	continue;
492	>	/*
493	>	*  Elliptical radii test based on Hessian
494	>	*/
495	>	decodedir(uvw[0], av->udir);
496	>	VCROSS(uvw[1], uvw[2], uvw[0]);
497	>	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
498	>	delta_t2 += d*d;
499	>	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
500	>	delta_t2 += d*d;
501	>	if (delta_t2 >= ambacc*ambacc)
502	>	continue;
503	>	/*
504	>	*  Test for potential light leak
505	>	*/
506	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
507	>	continue;
508	>	/*
509	>	*  Extrapolate value and compute final weight (hat function)
510	>	*/
511	>	if (!extambient(ct, av, r->rop, rn, uvw))
512	>	continue;
513	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
514	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
515	>	scalecolor(ct, d);
516	>	addcolor(acol, ct);
517	>	wsum += d;
518	>	}
519	>	return(wsum);
520	>	}
521	>
522	>
523	>	static int
524	>	makeambient(            /* make a new ambient value for storage */
525	>	COLOR  acol,
526	>	RAY  *r,
527	>	FVECT  rn,
528	>	int  al
529	>	)
530	>	{
531	>	AMBVAL  amb;
532	>	FVECT   uvw[3];
533	>	int     i;
534	>
535	>	amb.weight = 1.0;                       /* compute weight */
536	>	for (i = al; i-- > 0; )
537	>	amb.weight *= AVGREFL;
538	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
539	>	amb.weight = 1.25*r->rweight;
540	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
541	>	/* compute ambient */
542	>	i = doambient(acol, r, amb.weight,
543	>	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
544	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
545	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
546	>	return(i);
547	>	/* store value */
548	>	VCOPY(amb.pos, r->rop);
549	>	amb.ndir = encodedir(r->ron);
550	>	amb.udir = encodedir(uvw[0]);
551	>	amb.lvl = al;
552	>	copycolor(amb.val, acol);
553	>	/* insert into tree */
554	>	avsave(&amb);                           /* and save to file */
555	>	if (rn != r->ron) {                     /* texture */
556	>	VCOPY(uvw[2], r->ron);
557	>	extambient(acol, &amb, r->rop, rn, uvw);
558	>	}
559	>	return(1);
560	>	}
561	>
562	>
563	>	static int
564	>	extambient(             /* extrapolate value at pv, nv */
565	>	COLOR  cr,
566	>	AMBVAL   *ap,
567	>	FVECT  pv,
568	>	FVECT  nv,
569	>	FVECT  uvw[3]
570	>	)
571	>	{
572	>	const double    min_d = 0.05;
573	>	static FVECT    my_uvw[3];
574	>	FVECT           v1;
575	>	int             i;
576	>	double          d = 1.0;        /* zeroeth order */
577	>
578	>	if (uvw == NULL) {              /* need local coordinates? */
579	>	decodedir(my_uvw[2], ap->ndir);
580	>	decodedir(my_uvw[0], ap->udir);
581	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
582	>	uvw = my_uvw;
583	>	}
584	>	for (i = 3; i--; )              /* gradient due to translation */
585	>	d += (pv[i] - ap->pos[i]) *
586	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
587	>
588	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
589	>	for (i = 3; i--; )
590	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
591	>
592	>	if (d < min_d)                  /* should not use if we can avoid it */
593	>	d = min_d;
594	>	copycolor(cr, ap->val);
595	>	scalecolor(cr, d);
596	>	return(d > min_d);
597	>	}
598	>
599	>
600	>	static void
601	>	avinsert(                               /* insert ambient value in our tree */
602	>	AMBVAL *av
603	>	)
604	>	{
605	>	AMBTREE  *at;
606	>	AMBVAL  *ap;
607	>	AMBVAL  avh;
608	>	FVECT  ck0;
609	>	double  s;
610	>	int  branch;
611	>	int  i;
612	>
613	>	if (av->rad[0] <= FTINY)
614	>	error(CONSISTENCY, "zero ambient radius in avinsert");
615	>	at = &atrunk;
616	>	VCOPY(ck0, thescene.cuorg);
617	>	s = thescene.cusize;
618	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
619	>	if (at->kid == NULL)
620	>	if ((at->kid = newambtree()) == NULL)
621	>	error(SYSTEM, "out of memory in avinsert");
622	>	s *= 0.5;
623	>	branch = 0;
624	>	for (i = 0; i < 3; i++)
625	>	if (av->pos[i] > ck0[i] + s) {
626	>	ck0[i] += s;
627	>	branch |= 1 << i;
628	>	}
629	>	at = at->kid + branch;
630	>	}
631	>	avh.next = at->alist;           /* order by increasing level */
632	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
633	>	if ( ap->next->lvl > av->lvl ||
634	>	(ap->next->lvl == av->lvl) &
635	>	(ap->next->weight <= av->weight) )
636	>	break;
637	>	av->next = ap->next;
638	>	ap->next = (AMBVAL*)av;
639	>	at->alist = avh.next;
640	>	}
641	>
642	>
643	>	#else /* ! NEWAMB */
644	>
645	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
646	>	AMBTREE *at, FVECT c0, double s);
647	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
648	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
649	>
650	>
651	>	void
652	>	multambient(            /* compute ambient component & multiply by coef. */
653	>	COLOR  aval,
654	>	RAY  *r,
655	>	FVECT  nrm
656	>	)
657	>	{
658	>	static int  rdepth = 0;                 /* ambient recursion */
659	>	COLOR   acol, caustic;
660	>	double  d, l;
661	>
662	>	/* PMAP: Factor in ambient from global photon map (if enabled) and return
663	>	* as all ambient components accounted for */
664	>	if (ambPmap(aval, r, rdepth))
665	>	return;
666	>
667	>	/* PMAP: Otherwise factor in ambient from caustic photon map
668	>	* (ambPmapCaustic() returns zero if caustic photons disabled) and
669	>	* continue with RADIANCE ambient calculation */
670	>	copycolor(caustic, aval);
671	>	ambPmapCaustic(caustic, r, rdepth);
672	>
673	>	if (ambdiv <= 0)                        /* no ambient calculation */
674	>	goto dumbamb;
675	>	/* check number of bounces */
676	>	if (rdepth >= ambounce)
677	>	goto dumbamb;
678	>	/* check ambient list */
679	>	if (ambincl != -1 && r->ro != NULL &&
680	>	ambincl != inset(ambset, r->ro->omod))
681	>	goto dumbamb;
682	>
683	>	if (ambacc <= FTINY) {                  /* no ambient storage */
684	>	copycolor(acol, aval);
685	>	rdepth++;
686	>	d = doambient(acol, r, r->rweight, NULL, NULL);
687		rdepth--;
688	+	if (d <= FTINY)
689	+	goto dumbamb;
690	+	copycolor(aval, acol);
691	+
692	+	/* PMAP: add in caustic */
693	+	addcolor(aval, caustic);
694	+	return;
695		}
696	<	if (d > FTINY)
696	>
697	>	if (tracktime)                          /* sort to minimize thrashing */
698	>	sortambvals(0);
699	>	/* interpolate ambient value */
700	>	setcolor(acol, 0.0, 0.0, 0.0);
701	>	d = sumambient(acol, r, nrm, rdepth,
702	>	&atrunk, thescene.cuorg, thescene.cusize);
703	>
704	>	if (d > FTINY) {
705	>	d = 1.0/d;
706	>	scalecolor(acol, d);
707	>	multcolor(aval, acol);
708	>
709	>	/* PMAP: add in caustic */
710	>	addcolor(aval, caustic);
711		return;
712	+	}
713	+
714	+	rdepth++;                               /* need to cache new value */
715	+	d = makeambient(acol, r, nrm, rdepth-1);
716	+	rdepth--;
717	+
718	+	if (d > FTINY) {
719	+	multcolor(aval, acol);          /* got new value */
720	+
721	+	/* PMAP: add in caustic */
722	+	addcolor(aval, caustic);
723	+	return;
724	+	}
725	+
726		dumbamb:                                        /* return global value */
727	<	copycolor(acol, ambval);
727	>	if ((ambvwt <= 0) | (navsum == 0)) {
728	>	multcolor(aval, ambval);
729	>
730	>	/* PMAP: add in caustic */
731	>	addcolor(aval, caustic);
732	>	return;
733	>	}
734	>
735	>	l = bright(ambval);                     /* average in computations */
736	>	if (l > FTINY) {
737	>	d = (log(l)*(double)ambvwt + avsum) /
738	>	(double)(ambvwt + navsum);
739	>	d = exp(d) / l;
740	>	scalecolor(aval, d);
741	>	multcolor(aval, ambval);        /* apply color of ambval */
742	>	} else {
743	>	d = exp( avsum / (double)navsum );
744	>	scalecolor(aval, d);            /* neutral color */
745	>	}
746		}
747
748
749	<	double
750	<	sumambient(acol, r, al, at, c0, s)      /* get interpolated ambient value */
751	<	COLOR  acol;
752	<	register RAY  *r;
753	<	int  al;
754	<	AMBTREE  *at;
755	<	FVECT  c0;
756	<	double  s;
749	>	static double
750	>	sumambient(     /* get interpolated ambient value */
751	>	COLOR  acol,
752	>	RAY  *r,
753	>	FVECT  rn,
754	>	int  al,
755	>	AMBTREE  *at,
756	>	FVECT  c0,
757	>	double  s
758	>	)
759		{
760		double  d, e1, e2, wt, wsum;
761		COLOR  ct;
762		FVECT  ck0;
763		int  i;
764	<	register int  j;
765	<	register AMBVAL  *av;
766	<	/* do this node */
764	>	int  j;
765	>	AMBVAL   *av;
766	>
767		wsum = 0.0;
768	+	/* do this node */
769		for (av = at->alist; av != NULL; av = av->next) {
770	+	double  rn_dot = -2.0;
771	+	if (tracktime)
772	+	av->latick = ambclock;
773		/*
774		*  Ambient level test.
775		*/
776	<	if (av->lvl > al || av->weight < r->rweight-FTINY)
777	<	continue;
776	>	if (av->lvl > al ||     /* list sorted, so this works */
777	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
778	>	break;
779		/*
780		*  Ambient radius test.
781		*/
782	<	e1 = 0.0;
783	<	for (j = 0; j < 3; j++) {
192	<	d = av->pos[j] - r->rop[j];
193	<	e1 += d * d;
194	<	}
195	<	e1 /= av->rad * av->rad;
782	>	VSUB(ck0, av->pos, r->rop);
783	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
784		if (e1 > ambacc*ambacc*1.21)
785		continue;
786		/*
787	<	*  Normal direction test.
787	>	*  Direction test using closest normal.
788		*/
789	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
790	<	if (e2 < 0.0) e2 = 0.0;
791	<	if (e1 + e2 > ambacc*ambacc*1.21)
789	>	d = DOT(av->dir, r->ron);
790	>	if (rn != r->ron) {
791	>	rn_dot = DOT(av->dir, rn);
792	>	if (rn_dot > 1.0-FTINY)
793	>	rn_dot = 1.0-FTINY;
794	>	if (rn_dot >= d-FTINY) {
795	>	d = rn_dot;
796	>	rn_dot = -2.0;
797	>	}
798	>	}
799	>	e2 = (1.0 - d) * r->rweight;
800	>	if (e2 < 0.0)
801	>	e2 = 0.0;
802	>	else if (e1 + e2 > ambacc*ambacc*1.21)
803		continue;
804		/*
805		*  Ray behind test.
#	Line 214 | Line 813 | double s;
813		/*
814		*  Jittering final test reduces image artifacts.
815		*/
816	<	wt = sqrt(e1) + sqrt(e2);
817	<	wt *= .9 + .2*urand(9015+samplendx);
818	<	if (wt > ambacc)
816	>	e1 = sqrt(e1);
817	>	e2 = sqrt(e2);
818	>	wt = e1 + e2;
819	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
820		continue;
821	+	/*
822	+	*  Recompute directional error using perturbed normal
823	+	*/
824	+	if (rn_dot > 0.0) {
825	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
826	+	wt = e1 + e2;
827	+	}
828		if (wt <= 1e-3)
829		wt = 1e3;
830		else
831		wt = 1.0 / wt;
832		wsum += wt;
833	<	extambient(ct, av, r->rop, r->ron);
833	>	extambient(ct, av, r->rop, rn);
834		scalecolor(ct, wt);
835		addcolor(acol, ct);
836		}
#	Line 242 | Line 849 | double s;
849		break;
850		}
851		if (j == 3)
852	<	wsum += sumambient(acol, r, al, at->kid+i, ck0, s);
852	>	wsum += sumambient(acol, r, rn, al,
853	>	at->kid+i, ck0, s);
854		}
855		return(wsum);
856		}
857
858
859	<	double
860	<	makeambient(acol, r, al)        /* make a new ambient value */
861	<	COLOR  acol;
862	<	register RAY  *r;
863	<	int  al;
859	>	static double
860	>	makeambient(            /* make a new ambient value for storage */
861	>	COLOR  acol,
862	>	RAY  *r,
863	>	FVECT  rn,
864	>	int  al
865	>	)
866		{
867		AMBVAL  amb;
868		FVECT   gp, gd;
869	<	/* compute weight */
870	<	amb.weight = pow(AVGREFL, (double)al);
871	<	if (r->rweight < 0.2*amb.weight)        /* heuristic */
872	<	amb.weight = r->rweight;
869	>	int     i;
870	>
871	>	amb.weight = 1.0;                       /* compute weight */
872	>	for (i = al; i-- > 0; )
873	>	amb.weight *= AVGREFL;
874	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
875	>	amb.weight = 1.25*r->rweight;
876	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
877		/* compute ambient */
878		amb.rad = doambient(acol, r, amb.weight, gp, gd);
879	<	if (amb.rad == 0.0)
879	>	if (amb.rad <= FTINY) {
880	>	setcolor(acol, 0.0, 0.0, 0.0);
881		return(0.0);
882	<	/* store it */
882	>	}
883	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
884	>	/* store value */
885		VCOPY(amb.pos, r->rop);
886		VCOPY(amb.dir, r->ron);
887		amb.lvl = al;
#	Line 273 | Line 890 | int  al;
890		VCOPY(amb.gdir, gd);
891		/* insert into tree */
892		avsave(&amb);                           /* and save to file */
893	+	if (rn != r->ron)
894	+	extambient(acol, &amb, r->rop, rn);     /* texture */
895		return(amb.rad);
896		}
897
898
899	<	extambient(cr, ap, pv, nv)              /* extrapolate value at pv, nv */
900	<	COLOR  cr;
901	<	register AMBVAL  *ap;
902	<	FVECT  pv, nv;
899	>	static void
900	>	extambient(             /* extrapolate value at pv, nv */
901	>	COLOR  cr,
902	>	AMBVAL   *ap,
903	>	FVECT  pv,
904	>	FVECT  nv
905	>	)
906		{
907	<	FVECT  v1, v2;
908	<	register int  i;
907	>	FVECT  v1;
908	>	int  i;
909		double  d;
910
911		d = 1.0;                        /* zeroeth order */
#	Line 291 | Line 913 | FVECT  pv, nv;
913		for (i = 0; i < 3; i++)
914		d += ap->gpos[i]*(pv[i]-ap->pos[i]);
915		/* gradient due to rotation */
916	<	VCOPY(v1, ap->dir);
917	<	fcross(v2, v1, nv);
296	<	d += DOT(ap->gdir, v2);
916	>	VCROSS(v1, ap->dir, nv);
917	>	d += DOT(ap->gdir, v1);
918		if (d <= 0.0) {
919		setcolor(cr, 0.0, 0.0, 0.0);
920		return;
#	Line 303 | Line 924 | FVECT  pv, nv;
924		}
925
926
927	<	static
928	<	initambfile(creat)              /* initialize ambient file */
929	<	int  creat;
927	>	static void
928	>	avinsert(                               /* insert ambient value in our tree */
929	>	AMBVAL *av
930	>	)
931		{
932	<	extern char  *progname, *octname, VersionID[];
932	>	AMBTREE  *at;
933	>	AMBVAL  *ap;
934	>	AMBVAL  avh;
935	>	FVECT  ck0;
936	>	double  s;
937	>	int  branch;
938	>	int  i;
939
940	<	#ifdef MSDOS
941	<	setmode(fileno(ambfp), O_BINARY);
940	>	if (av->rad <= FTINY)
941	>	error(CONSISTENCY, "zero ambient radius in avinsert");
942	>	at = &atrunk;
943	>	VCOPY(ck0, thescene.cuorg);
944	>	s = thescene.cusize;
945	>	while (s*(OCTSCALE/2) > av->rad*ambacc) {
946	>	if (at->kid == NULL)
947	>	if ((at->kid = newambtree()) == NULL)
948	>	error(SYSTEM, "out of memory in avinsert");
949	>	s *= 0.5;
950	>	branch = 0;
951	>	for (i = 0; i < 3; i++)
952	>	if (av->pos[i] > ck0[i] + s) {
953	>	ck0[i] += s;
954	>	branch |= 1 << i;
955	>	}
956	>	at = at->kid + branch;
957	>	}
958	>	avh.next = at->alist;           /* order by increasing level */
959	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
960	>	if ( ap->next->lvl > av->lvl ||
961	>	(ap->next->lvl == av->lvl) &
962	>	(ap->next->weight <= av->weight) )
963	>	break;
964	>	av->next = ap->next;
965	>	ap->next = (AMBVAL*)av;
966	>	at->alist = avh.next;
967	>	}
968	>
969	>	#endif  /* ! NEWAMB */
970	>
971	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
972	>
973	>	static void
974	>	initambfile(            /* initialize ambient file */
975	>	int  cre8
976	>	)
977	>	{
978	>	extern char  *progname, *octname;
979	>	static char  *mybuf = NULL;
980	>
981	>	#ifdef  F_SETLKW
982	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
983		#endif
984	<	setbuf(ambfp, bmalloc(BUFSIZ));
985	<	if (creat) {                    /* new file */
986	<	fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ",
984	>	SET_FILE_BINARY(ambfp);
985	>	if (mybuf == NULL)
986	>	mybuf = (char *)bmalloc(BUFSIZ+8);
987	>	setbuf(ambfp, mybuf);
988	>	if (cre8) {                     /* new file */
989	>	newheader("RADIANCE", ambfp);
990	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
991		progname, colval(ambval,RED),
992		colval(ambval,GRN), colval(ambval,BLU),
993	<	ambounce, ambacc);
994	<	fprintf(ambfp, "-ad %d -as %d -ar %d %s\n",
995	<	ambdiv, ambssamp, ambres,
996	<	octname==NULL ? "" : octname);
993	>	ambvwt, ambounce, ambacc);
994	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
995	>	ambdiv, ambssamp, ambres);
996	>	if (octname != NULL)
997	>	fputs(octname, ambfp);
998	>	fputc('\n', ambfp);
999		fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1000	+	fputnow(ambfp);
1001		fputformat(AMBFMT, ambfp);
1002	<	putc('\n', ambfp);
1002	>	fputc('\n', ambfp);
1003		putambmagic(ambfp);
1004	<	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) {
1005	<	sprintf(errmsg, "bad ambient file \"%s\"", ambfname);
330	<	error(USER, errmsg);
331	<	}
1004	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
1005	>	error(USER, "bad ambient file");
1006		}
1007
1008
1009	<	static
1010	<	avsave(av)                              /* insert and save an ambient value */
1011	<	AMBVAL  *av;
1009	>	static void
1010	>	avsave(                         /* insert and save an ambient value */
1011	>	AMBVAL  *av
1012	>	)
1013		{
1014	<	avinsert(av, &atrunk, thescene.cuorg, thescene.cusize);
1014	>	avstore(av);
1015		if (ambfp == NULL)
1016		return;
1017		if (writambval(av, ambfp) < 0)
#	Line 346 | Line 1021 | AMBVAL *av;
1021		goto writerr;
1022		return;
1023		writerr:
1024	<	sprintf(errmsg, "error writing ambient file \"%s\"", ambfname);
350	<	error(SYSTEM, errmsg);
1024	>	error(SYSTEM, "error writing to ambient file");
1025		}
1026
1027
1028	<	static
1029	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
1030	<	AMBVAL  *aval;
1031	<	register AMBTREE  *at;
358	<	FVECT  c0;
359	<	double  s;
1028	>	static AMBVAL *
1029	>	avstore(                                /* allocate memory and save aval */
1030	>	AMBVAL  *aval
1031	>	)
1032		{
1033	<	FVECT  ck0;
1034	<	int  branch;
363	<	register AMBVAL  *av;
364	<	register int  i;
1033	>	AMBVAL  *av;
1034	>	double  d;
1035
1036		if ((av = newambval()) == NULL)
1037	<	goto memerr;
1038	<	copystruct(av, aval);
1039	<	VCOPY(ck0, c0);
1040	<	while (s*(OCTSCALE/2) > av->rad*ambacc) {
1041	<	if (at->kid == NULL)
1042	<	if ((at->kid = newambtree()) == NULL)
1043	<	goto memerr;
1044	<	s *= 0.5;
1045	<	branch = 0;
1046	<	for (i = 0; i < 3; i++)
1047	<	if (av->pos[i] > ck0[i] + s) {
1048	<	ck0[i] += s;
1049	<	branch |= 1 << i;
1037	>	error(SYSTEM, "out of memory in avstore");
1038	>	*av = *aval;
1039	>	av->latick = ambclock;
1040	>	av->next = NULL;
1041	>	nambvals++;
1042	>	d = bright(av->val);
1043	>	if (d > FTINY) {                /* add to log sum for averaging */
1044	>	avsum += log(d);
1045	>	navsum++;
1046	>	}
1047	>	avinsert(av);                   /* insert in our cache tree */
1048	>	return(av);
1049	>	}
1050	>
1051	>
1052	>	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
1053	>
1054	>	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
1055	>
1056	>
1057	>	static AMBTREE *
1058	>	newambtree(void)                                /* allocate 8 ambient tree structs */
1059	>	{
1060	>	AMBTREE  *atp, *upperlim;
1061	>
1062	>	if (atfreelist == NULL) {       /* get more nodes */
1063	>	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
1064	>	if (atfreelist == NULL)
1065	>	return(NULL);
1066	>	/* link new free list */
1067	>	upperlim = atfreelist + 8*(ATALLOCSZ-1);
1068	>	for (atp = atfreelist; atp < upperlim; atp += 8)
1069	>	atp->kid = atp + 8;
1070	>	atp->kid = NULL;
1071	>	}
1072	>	atp = atfreelist;
1073	>	atfreelist = atp->kid;
1074	>	memset(atp, 0, 8*sizeof(AMBTREE));
1075	>	return(atp);
1076	>	}
1077	>
1078	>
1079	>	static void
1080	>	freeambtree(                    /* free 8 ambient tree structs */
1081	>	AMBTREE  *atp
1082	>	)
1083	>	{
1084	>	atp->kid = atfreelist;
1085	>	atfreelist = atp;
1086	>	}
1087	>
1088	>
1089	>	static void
1090	>	unloadatree(                    /* unload an ambient value tree */
1091	>	AMBTREE  *at,
1092	>	unloadtf_t *f
1093	>	)
1094	>	{
1095	>	AMBVAL  *av;
1096	>	int  i;
1097	>	/* transfer values at this node */
1098	>	for (av = at->alist; av != NULL; av = at->alist) {
1099	>	at->alist = av->next;
1100	>	av->next = NULL;
1101	>	(*f)(av);
1102	>	}
1103	>	if (at->kid == NULL)
1104	>	return;
1105	>	for (i = 0; i < 8; i++)         /* transfer and free children */
1106	>	unloadatree(at->kid+i, f);
1107	>	freeambtree(at->kid);
1108	>	at->kid = NULL;
1109	>	}
1110	>
1111	>
1112	>	static struct avl {
1113	>	AMBVAL  *p;
1114	>	unsigned long   t;
1115	>	}       *avlist1;                       /* ambient value list with ticks */
1116	>	static AMBVAL   **avlist2;              /* memory positions for sorting */
1117	>	static int      i_avlist;               /* index for lists */
1118	>
1119	>	static int alatcmp(const void *av1, const void *av2);
1120	>
1121	>	static void
1122	>	avfree(AMBVAL *av)
1123	>	{
1124	>	free(av);
1125	>	}
1126	>
1127	>	static void
1128	>	av2list(
1129	>	AMBVAL *av
1130	>	)
1131	>	{
1132	>	#ifdef DEBUG
1133	>	if (i_avlist >= nambvals)
1134	>	error(CONSISTENCY, "too many ambient values in av2list1");
1135	>	#endif
1136	>	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1137	>	avlist1[i_avlist++].t = av->latick;
1138	>	}
1139	>
1140	>
1141	>	static int
1142	>	alatcmp(                        /* compare ambient values for MRA */
1143	>	const void *av1,
1144	>	const void *av2
1145	>	)
1146	>	{
1147	>	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1148	>	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1149	>	}
1150	>
1151	>
1152	>	/* GW NOTE 2002/10/3:
1153	>	* I used to compare AMBVAL pointers, but found that this was the
1154	>	* cause of a serious consistency error with gcc, since the optimizer
1155	>	* uses some dangerous trick in pointer subtraction that
1156	>	* assumes pointers differ by exact struct size increments.
1157	>	*/
1158	>	static int
1159	>	aposcmp(                        /* compare ambient value positions */
1160	>	const void      *avp1,
1161	>	const void      *avp2
1162	>	)
1163	>	{
1164	>	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1165	>	if (diff < 0)
1166	>	return(-1);
1167	>	return(diff > 0);
1168	>	}
1169	>
1170	>
1171	>	static int
1172	>	avlmemi(                                /* find list position from address */
1173	>	AMBVAL  *avaddr
1174	>	)
1175	>	{
1176	>	AMBVAL  **avlpp;
1177	>
1178	>	avlpp = (AMBVAL **)bsearch(&avaddr, avlist2,
1179	>	nambvals, sizeof(AMBVAL *), aposcmp);
1180	>	if (avlpp == NULL)
1181	>	error(CONSISTENCY, "address not found in avlmemi");
1182	>	return(avlpp - avlist2);
1183	>	}
1184	>
1185	>
1186	>	static void
1187	>	sortambvals(                    /* resort ambient values */
1188	>	int     always
1189	>	)
1190	>	{
1191	>	AMBTREE  oldatrunk;
1192	>	AMBVAL  tav, *tap, *pnext;
1193	>	int     i, j;
1194	>	/* see if it's time yet */
1195	>	if (!always && (ambclock++ < lastsort+sortintvl ||
1196	>	nambvals < SORT_THRESH))
1197	>	return;
1198	>	/*
1199	>	* The idea here is to minimize memory thrashing
1200	>	* in VM systems by improving reference locality.
1201	>	* We do this by periodically sorting our stored ambient
1202	>	* values in memory in order of most recently to least
1203	>	* recently accessed.  This ordering was chosen so that new
1204	>	* ambient values (which tend to be less important) go into
1205	>	* higher memory with the infrequently accessed values.
1206	>	*      Since we expect our values to need sorting less
1207	>	* frequently as the process continues, we double our
1208	>	* waiting interval after each call.
1209	>	*      This routine is also called by setambacc() with
1210	>	* the "always" parameter set to 1 so that the ambient
1211	>	* tree will be rebuilt with the new accuracy parameter.
1212	>	*/
1213	>	if (tracktime) {                /* allocate pointer arrays to sort */
1214	>	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1215	>	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1216	>	} else {
1217	>	avlist2 = NULL;
1218	>	avlist1 = NULL;
1219	>	}
1220	>	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1221	>	if (avlist2 != NULL)
1222	>	free(avlist2);
1223	>	if (always) {           /* rebuild without sorting */
1224	>	oldatrunk = atrunk;
1225	>	atrunk.alist = NULL;
1226	>	atrunk.kid = NULL;
1227	>	unloadatree(&oldatrunk, avinsert);
1228	>	}
1229	>	} else {                        /* sort memory by last access time */
1230	>	/*
1231	>	* Sorting memory is tricky because it isn't contiguous.
1232	>	* We have to sort an array of pointers by MRA and also
1233	>	* by memory position.  We then copy values in "loops"
1234	>	* to minimize memory hits.  Nevertheless, we will visit
1235	>	* everyone at least twice, and this is an expensive process
1236	>	* when we're thrashing, which is when we need to do it.
1237	>	*/
1238	>	#ifdef DEBUG
1239	>	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1240	>	nambvals, ambclock);
1241	>	eputs(errmsg);
1242	>	#endif
1243	>	i_avlist = 0;
1244	>	unloadatree(&atrunk, av2list);  /* empty current tree */
1245	>	#ifdef DEBUG
1246	>	if (i_avlist < nambvals)
1247	>	error(CONSISTENCY, "missing ambient values in sortambvals");
1248	>	#endif
1249	>	qsort(avlist1, nambvals, sizeof(struct avl), alatcmp);
1250	>	qsort(avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1251	>	for (i = 0; i < nambvals; i++) {
1252	>	if (avlist1[i].p == NULL)
1253	>	continue;
1254	>	tap = avlist2[i];
1255	>	tav = *tap;
1256	>	for (j = i; (pnext = avlist1[j].p) != tap;
1257	>	j = avlmemi(pnext)) {
1258	>	*(avlist2[j]) = *pnext;
1259	>	avinsert(avlist2[j]);
1260	>	avlist1[j].p = NULL;
1261		}
1262	<	at = at->kid + branch;
1262	>	*(avlist2[j]) = tav;
1263	>	avinsert(avlist2[j]);
1264	>	avlist1[j].p = NULL;
1265	>	}
1266	>	free(avlist1);
1267	>	free(avlist2);
1268	>	/* compute new sort interval */
1269	>	sortintvl = ambclock - lastsort;
1270	>	if (sortintvl >= MAX_SORT_INTVL/2)
1271	>	sortintvl = MAX_SORT_INTVL;
1272	>	else
1273	>	sortintvl <<= 1;        /* wait twice as long next */
1274	>	#ifdef DEBUG
1275	>	eputs("done\n");
1276	>	#endif
1277		}
1278	<	av->next = at->alist;
1279	<	at->alist = av;
1280	<	return;
386	<	memerr:
387	<	error(SYSTEM, "out of memory in avinsert");
1278	>	if (ambclock >= MAXACLOCK)
1279	>	ambclock = MAXACLOCK/2;
1280	>	lastsort = ambclock;
1281		}
1282
1283
1284	<	#ifdef  NIX
1284	>	#ifdef  F_SETLKW
1285
1286	<	int
1287	<	ambsync()                       /* flush ambient file */
1286	>	static void
1287	>	aflock(                 /* lock/unlock ambient file */
1288	>	int  typ
1289	>	)
1290		{
1291	<	if (nunflshed == 0)
1292	<	return(0);
1293	<	nunflshed = 0;
1294	<	return(fflush(ambfp));
1291	>	static struct flock  fls;       /* static so initialized to zeroes */
1292	>
1293	>	if (typ == fls.l_type)          /* already called? */
1294	>	return;
1295	>	fls.l_type = typ;
1296	>	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1297	>	error(SYSTEM, "cannot (un)lock ambient file");
1298		}
1299
402	–	#else
1300
1301		int
1302	<	ambsync()                       /* synchronize ambient file */
1302	>	ambsync(void)                   /* synchronize ambient file */
1303		{
407	–	static FILE  *ambinp = NULL;
408	–	static long  lastpos = -1;
409	–	struct flock  fls;
1304		long  flen;
1305		AMBVAL  avs;
1306	<	register int  n;
1306	>	int  n;
1307
1308	<	if (nunflshed == 0)
1308	>	if (ambfp == NULL)      /* no ambient file? */
1309		return(0);
1310	<	/* gain exclusive access */
1311	<	fls.l_type = F_WRLCK;
418	<	fls.l_whence = 0;
419	<	fls.l_start = 0L;
420	<	fls.l_len = 0L;
421	<	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
422	<	error(SYSTEM, "cannot lock ambient file");
423	<	if (lastpos < 0)        /* initializing */
424	<	goto syncend;
1310	>	/* gain appropriate access */
1311	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1312		/* see if file has grown */
1313	<	if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0)
1314	<	error(SYSTEM, "cannot seek on ambient file");
1315	<	if (n = flen - lastpos) {               /* file has grown */
1316	<	if (ambinp == NULL) {
1317	<	ambinp = fopen(ambfname, "r");
1313	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1314	>	goto seekerr;
1315	>	if ((n = flen - lastpos) > 0) {         /* file has grown */
1316	>	if (ambinp == NULL) {           /* use duplicate filedes */
1317	>	ambinp = fdopen(dup(fileno(ambfp)), "r");
1318		if (ambinp == NULL)
1319	<	error(SYSTEM, "fopen failed in ambsync");
1319	>	error(SYSTEM, "fdopen failed in ambsync");
1320		}
1321	<	if (fseek(ambinp, lastpos, 0) < 0)
1322	<	error(SYSTEM, "fseek failed in ambsync");
1321	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1322	>	goto seekerr;
1323		while (n >= AMBVALSIZ) {        /* load contributed values */
1324	<	readambval(&avs, ambinp);
1325	<	avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize);
1324	>	if (!readambval(&avs, ambinp)) {
1325	>	sprintf(errmsg,
1326	>	"ambient file \"%s\" corrupted near character %ld",
1327	>	ambfile, flen - n);
1328	>	error(WARNING, errmsg);
1329	>	break;
1330	>	}
1331	>	avstore(&avs);
1332		n -= AMBVALSIZ;
1333		}
1334	<	if (n)                          /* alignment */
1335	<	lseek(fileno(ambfp), flen-n, 0);
1334	>	lastpos = flen - n;
1335	>	/*** seek always as safety measure
1336	>	if (n) ***/                     /* alignment */
1337	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1338	>	goto seekerr;
1339		}
444	–	syncend:
1340		n = fflush(ambfp);                      /* calls write() at last */
1341	<	lastpos = lseek(fileno(ambfp), 0L, 1);
1342	<	fls.l_type = F_UNLCK;                   /* release file */
1343	<	fcntl(fileno(ambfp), F_SETLKW, &fls);
1341	>	if (n != EOF)
1342	>	lastpos += (long)nunflshed*AMBVALSIZ;
1343	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1344	>	goto seekerr;
1345	>
1346	>	aflock(F_UNLCK);                        /* release file */
1347		nunflshed = 0;
1348		return(n);
1349	+	seekerr:
1350	+	error(SYSTEM, "seek failed in ambsync");
1351	+	return -1; /* pro forma return */
1352		}
1353
1354	<	#endif
1354	>	#else   /* ! F_SETLKW */
1355	>
1356	>	int
1357	>	ambsync(void)                   /* flush ambient file */
1358	>	{
1359	>	if (ambfp == NULL)
1360	>	return(0);
1361	>	nunflshed = 0;
1362	>	return(fflush(ambfp));
1363	>	}
1364	>
1365	>	#endif  /* ! F_SETLKW */

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