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

Comparing ray/src/rt/ambient.c (file contents):
Revision 1.4 by greg, Tue May 30 11:06:29 1989 UTC vs.
Revision 2.105 by greg, Tue Jan 9 05:01:15 2018 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	+	#include  "otspecial.h"
16	+	#include  "resolu.h"
17	+	#include  "ambient.h"
18	+	#include  "source.h"
19		#include  "random.h"
20	+	#include  "pmapamb.h"
21
22	<	#define  OCTSCALE       0.5     /* ceil((valid rad.)/(cube size)) */
22	>	#ifndef  OCTSCALE
23	>	#define  OCTSCALE       1.0     /* ceil((valid rad.)/(cube size)) */
24	>	#endif
25
26	<	extern CUBE  thescene;          /* contains space boundaries */
26	>	extern char  *shm_boundary;     /* memory sharing boundary */
27
28	<	extern COLOR  ambval;           /* global ambient component */
29	<	extern double  ambacc;          /* ambient accuracy */
30	<	extern int  ambres;             /* ambient resolution */
31	<	extern int  ambdiv;             /* number of divisions for calculation */
30	<	extern int  ambssamp;           /* number of super-samples */
31	<	extern int  ambounce;           /* number of ambient bounces */
32	<	extern char  *amblist[];        /* ambient include/exclude list */
33	<	extern int  ambincl;            /* include == 1, exclude == 0 */
28	>	#ifndef  MAXASET
29	>	#define  MAXASET        4095    /* maximum number of elements in ambient set */
30	>	#endif
31	>	OBJECT  ambset[MAXASET+1]={0};  /* ambient include/exclude set */
32
33	<	OBJECT  ambset[128];            /* ambient include/exclude set */
33	>	double  maxarad;                /* maximum ambient radius */
34	>	double  minarad;                /* minimum ambient radius */
35
36	<	double  maxarad;                /* maximum ambient radius */
38	<	double  minarad;                /* minimum ambient radius */
36	>	static AMBTREE  atrunk;         /* our ambient trunk node */
37
38	<	typedef struct ambval {
39	<	FVECT  pos;             /* position in space */
42	<	FVECT  dir;             /* normal direction */
43	<	int  lvl;               /* recursion level of parent ray */
44	<	float  weight;          /* weight of parent ray */
45	<	COLOR  val;             /* computed ambient value */
46	<	float  rad;             /* validity radius */
47	<	struct ambval  *next;   /* next in list */
48	<	}  AMBVAL;                      /* ambient value */
38	>	static FILE  *ambfp = NULL;     /* ambient file pointer */
39	>	static int  nunflshed = 0;      /* number of unflushed ambient values */
40
41	<	typedef struct ambtree {
42	<	AMBVAL  *alist;         /* ambient value list */
43	<	struct ambtree  *kid;   /* 8 child nodes */
44	<	}  AMBTREE;                     /* ambient octree */
41	>	#ifndef SORT_THRESH
42	>	#ifdef SMLMEM
43	>	#define SORT_THRESH     ((16L<<20)/sizeof(AMBVAL))
44	>	#else
45	>	#define SORT_THRESH     ((64L<<20)/sizeof(AMBVAL))
46	>	#endif
47	>	#endif
48	>	#ifndef SORT_INTVL
49	>	#define SORT_INTVL      (SORT_THRESH<<1)
50	>	#endif
51	>	#ifndef MAX_SORT_INTVL
52	>	#define MAX_SORT_INTVL  (SORT_INTVL<<6)
53	>	#endif
54
55	–	typedef struct {
56	–	float  k;               /* error contribution per sample */
57	–	COLOR  v;               /* ray sum */
58	–	int  n;                 /* number of samples */
59	–	short  t, p;            /* theta, phi indices */
60	–	}  AMBSAMP;                     /* ambient sample */
55
56	<	static AMBTREE  atrunk;         /* our ambient trunk node */
56	>	static double  avsum = 0.;              /* computed ambient value sum (log) */
57	>	static unsigned int  navsum = 0;        /* number of values in avsum */
58	>	static unsigned int  nambvals = 0;      /* total number of indirect values */
59	>	static unsigned int  nambshare = 0;     /* number of values from file */
60	>	static unsigned long  ambclock = 0;     /* ambient access clock */
61	>	static unsigned long  lastsort = 0;     /* time of last value sort */
62	>	static long  sortintvl = SORT_INTVL;    /* time until next sort */
63	>	static FILE  *ambinp = NULL;            /* auxiliary file for input */
64	>	static long  lastpos = -1;              /* last flush position */
65
66	<	static FILE  *ambfp = NULL;     /* ambient file pointer */
66	>	#define MAXACLOCK       (1L<<30)        /* clock turnover value */
67	>	/*
68	>	* Track access times unless we are sharing ambient values
69	>	* through memory on a multiprocessor, when we want to avoid
70	>	* claiming our own memory (copy on write).  Go ahead anyway
71	>	* if more than two thirds of our values are unshared.
72	>	* Compile with -Dtracktime=0 to turn this code off.
73	>	*/
74	>	#ifndef tracktime
75	>	#define tracktime       (shm_boundary == NULL || nambvals > 3*nambshare)
76	>	#endif
77
78	<	#define  newambval()    (AMBVAL *)bmalloc(sizeof(AMBVAL))
78	>	#define  AMBFLUSH       (BUFSIZ/AMBVALSIZ)
79
80	<	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
80	>	#define  newambval()    (AMBVAL *)malloc(sizeof(AMBVAL))
81
82	<	double  sumambient(), doambient(), makeambient();
82	>	static void initambfile(int creat);
83	>	static void avsave(AMBVAL *av);
84	>	static AMBVAL *avstore(AMBVAL  *aval);
85	>	static AMBTREE *newambtree(void);
86	>	static void freeambtree(AMBTREE  *atp);
87
88	+	typedef void unloadtf_t(AMBVAL *);
89	+	static unloadtf_t avinsert;
90	+	static unloadtf_t av2list;
91	+	static unloadtf_t avfree;
92	+	static void unloadatree(AMBTREE  *at, unloadtf_t *f);
93
94	<	setambient(afile)                       /* initialize calculation */
95	<	char  *afile;
94	>	static int aposcmp(const void *avp1, const void *avp2);
95	>	static int avlmemi(AMBVAL *avaddr);
96	>	static void sortambvals(int always);
97	>
98	>	#ifdef  F_SETLKW
99	>	static void aflock(int  typ);
100	>	#endif
101	>
102	>
103	>	void
104	>	setambres(                              /* set ambient resolution */
105	>	int  ar
106	>	)
107		{
108	<	long  ftell();
109	<	char  **amblp;
110	<	OBJECT  obj;
111	<	AMBVAL  amb;
112	<	/* set up ambient set */
113	<	ambset[0] = 0;
114	<	for (amblp = amblist; *amblp != NULL; amblp++) {
115	<	if ((obj = modifier(*amblp)) == OVOID) {
116	<	sprintf(errmsg, "unknown %s modifier \"%s\"",
117	<	ambincl ? "include" : "exclude", *amblp);
108	>	ambres = ar < 0 ? 0 : ar;               /* may be done already */
109	>	/* set min & max radii */
110	>	if (ar <= 0) {
111	>	minarad = 0;
112	>	maxarad = thescene.cusize*0.2;
113	>	} else {
114	>	minarad = thescene.cusize / ar;
115	>	maxarad = 64.0 * minarad;               /* heuristic */
116	>	if (maxarad > thescene.cusize*0.2)
117	>	maxarad = thescene.cusize*0.2;
118	>	}
119	>	if (minarad <= FTINY)
120	>	minarad = 10.0*FTINY;
121	>	if (maxarad <= minarad)
122	>	maxarad = 64.0 * minarad;
123	>	}
124	>
125	>
126	>	void
127	>	setambacc(                              /* set ambient accuracy */
128	>	double  newa
129	>	)
130	>	{
131	>	static double   olda;           /* remember previous setting here */
132	>
133	>	newa *= (newa > 0);
134	>	if (fabs(newa - olda) >= .05*(newa + olda)) {
135	>	ambacc = newa;
136	>	if (nambvals > 0)
137	>	sortambvals(1);         /* rebuild tree */
138	>	}
139	>	}
140	>
141	>
142	>	void
143	>	setambient(void)                                /* initialize calculation */
144	>	{
145	>	int     readonly = 0;
146	>	long    flen;
147	>	AMBVAL  amb;
148	>	/* make sure we're fresh */
149	>	ambdone();
150	>	/* init ambient limits */
151	>	setambres(ambres);
152	>	setambacc(ambacc);
153	>	if (ambfile == NULL || !ambfile[0])
154	>	return;
155	>	if (ambacc <= FTINY) {
156	>	sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
157	>	ambfile);
158	>	error(WARNING, errmsg);
159	>	return;
160	>	}
161	>	/* open ambient file */
162	>	if ((ambfp = fopen(ambfile, "r+")) == NULL)
163	>	readonly = (ambfp = fopen(ambfile, "r")) != NULL;
164	>	if (ambfp != NULL) {
165	>	initambfile(0);                 /* file exists */
166	>	lastpos = ftell(ambfp);
167	>	while (readambval(&amb, ambfp))
168	>	avstore(&amb);
169	>	nambshare = nambvals;           /* share loaded values */
170	>	if (readonly) {
171	>	sprintf(errmsg,
172	>	"loaded %u values from read-only ambient file",
173	>	nambvals);
174		error(WARNING, errmsg);
175	<	continue;
175	>	fclose(ambfp);          /* close file so no writes */
176	>	ambfp = NULL;
177	>	return;                 /* avoid ambsync() */
178		}
179	<	if (!inset(ambset, obj))
180	<	insertelem(ambset, obj);
179	>	/* align file pointer */
180	>	lastpos += (long)nambvals*AMBVALSIZ;
181	>	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
182	>	if (flen != lastpos) {
183	>	sprintf(errmsg,
184	>	"ignoring last %ld values in ambient file (corrupted)",
185	>	(flen - lastpos)/AMBVALSIZ);
186	>	error(WARNING, errmsg);
187	>	fseek(ambfp, lastpos, SEEK_SET);
188	>	ftruncate(fileno(ambfp), (off_t)lastpos);
189	>	}
190	>	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
191	>	initambfile(1);                 /* else create new file */
192	>	fflush(ambfp);
193	>	lastpos = ftell(ambfp);
194	>	} else {
195	>	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
196	>	error(SYSTEM, errmsg);
197		}
198	<	maxarad = thescene.cusize / 2.0;                /* maximum radius */
199	<	/* minimum radius */
200	<	minarad = ambres > 0 ? thescene.cusize/ambres : 0.0;
198	>	#ifdef  F_SETLKW
199	>	aflock(F_UNLCK);                        /* release file */
200	>	#endif
201	>	}
202
203	<	/* open ambient file */
204	<	if (afile != NULL)
205	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
206	<	while (fread(&amb, sizeof(AMBVAL), 1, ambfp) == 1)
207	<	avinsert(&amb, &atrunk, thescene.cuorg,
208	<	thescene.cusize);
209	<	/* align */
210	<	fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1);
211	<	} else if ((ambfp = fopen(afile, "w")) == NULL) {
212	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
213	<	afile);
107	<	error(SYSTEM, errmsg);
203	>
204	>	void
205	>	ambdone(void)                   /* close ambient file and free memory */
206	>	{
207	>	if (ambfp != NULL) {            /* close ambient file */
208	>	ambsync();
209	>	fclose(ambfp);
210	>	ambfp = NULL;
211	>	if (ambinp != NULL) {
212	>	fclose(ambinp);
213	>	ambinp = NULL;
214		}
215	+	lastpos = -1;
216	+	}
217	+	/* free ambient tree */
218	+	unloadatree(&atrunk, avfree);
219	+	/* reset state variables */
220	+	avsum = 0.;
221	+	navsum = 0;
222	+	nambvals = 0;
223	+	nambshare = 0;
224	+	ambclock = 0;
225	+	lastsort = 0;
226	+	sortintvl = SORT_INTVL;
227		}
228
229
230	<	ambient(acol, r)                /* compute ambient component for ray */
231	<	COLOR  acol;
232	<	register RAY  *r;
230	>	void
231	>	ambnotify(                      /* record new modifier */
232	>	OBJECT  obj
233	>	)
234		{
235	+	static int  hitlimit = 0;
236	+	OBJREC   *o;
237	+	char  **amblp;
238	+
239	+	if (obj == OVOID) {             /* starting over */
240	+	ambset[0] = 0;
241	+	hitlimit = 0;
242	+	return;
243	+	}
244	+	o = objptr(obj);
245	+	if (hitlimit || !ismodifier(o->otype))
246	+	return;
247	+	for (amblp = amblist; *amblp != NULL; amblp++)
248	+	if (!strcmp(o->oname, *amblp)) {
249	+	if (ambset[0] >= MAXASET) {
250	+	error(WARNING, "too many modifiers in ambient list");
251	+	hitlimit++;
252	+	return;         /* should this be fatal? */
253	+	}
254	+	insertelem(ambset, obj);
255	+	return;
256	+	}
257	+	}
258	+
259	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
260	+
261	+	#ifndef OLDAMB
262	+
263	+	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
264	+
265	+	static int      plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang);
266	+	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
267	+	AMBTREE *at, FVECT c0, double s);
268	+	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
269	+	static int      extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
270	+	FVECT uvw[3]);
271	+
272	+	void
273	+	multambient(            /* compute ambient component & multiply by coef. */
274	+	COLOR  aval,
275	+	RAY  *r,
276	+	FVECT  nrm
277	+	)
278	+	{
279		static int  rdepth = 0;                 /* ambient recursion */
280	<	double  wsum;
280	>	COLOR   acol, caustic;
281	>	int     i, ok;
282	>	double  d, l;
283
284	<	rdepth++;                               /* increment level */
284	>	/* PMAP: Factor in ambient from photon map, if enabled and ray is
285	>	* ambient. Return as all ambient components accounted for, else
286	>	* continue. */
287	>	if (ambPmap(aval, r, rdepth))
288	>	return;
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 129 | 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	+	/* 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	<	copycolor(acol, ambval);
366	<	done:                                           /* must finish here! */
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) /
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 );
382	>	scalecolor(aval, d);            /* neutral color */
383	>	}
384	>	}
385	>
386	>
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	>	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	>	*  Ambient level test
484	>	*/
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	>	*  Modified ray behind test
500	>	*/
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	>	*  Elliptical radii test based on Hessian
511	>	*/
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	>	*  Test for potential light leak
522	>	*/
523	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
524	>	continue;
525	>	/*
526	>	*  Extrapolate value and compute final weight (hat function)
527	>	*/
528	>	if (!extambient(ct, av, r->rop, rn, uvw))
529	>	continue;
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	>	}
536	>	return(wsum);
537	>	}
538	>
539	>
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;
549	>	FVECT   uvw[3];
550	>	int     i;
551	>
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	>	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	>	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	>	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	>	const double    min_d = 0.05;
590	>	static FVECT    my_uvw[3];
591	>	FVECT           v1;
592	>	int             i;
593	>	double          d = 1.0;        /* zeroeth order */
594	>
595	>	if (uvw == NULL) {              /* need local coordinates? */
596	>	decodedir(my_uvw[2], ap->ndir);
597	>	decodedir(my_uvw[0], ap->udir);
598	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
599	>	uvw = my_uvw;
600	>	}
601	>	for (i = 3; i--; )              /* gradient due to translation */
602	>	d += (pv[i] - ap->pos[i]) *
603	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
604	>
605	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
606	>	for (i = 3; i--; )
607	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
608	>
609	>	if (d < min_d)                  /* should not use if we can avoid it */
610	>	d = min_d;
611	>	copycolor(cr, ap->val);
612	>	scalecolor(cr, d);
613	>	return(d > min_d);
614	>	}
615	>
616	>
617	>	static void
618	>	avinsert(                               /* insert ambient value in our tree */
619	>	AMBVAL *av
620	>	)
621	>	{
622	>	AMBTREE  *at;
623	>	AMBVAL  *ap;
624	>	AMBVAL  avh;
625	>	FVECT  ck0;
626	>	double  s;
627	>	int  branch;
628	>	int  i;
629	>
630	>	if (av->rad[0] <= FTINY)
631	>	error(CONSISTENCY, "zero ambient radius in avinsert");
632	>	at = &atrunk;
633	>	VCOPY(ck0, thescene.cuorg);
634	>	s = thescene.cusize;
635	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
636	>	if (at->kid == NULL)
637	>	if ((at->kid = newambtree()) == NULL)
638	>	error(SYSTEM, "out of memory in avinsert");
639	>	s *= 0.5;
640	>	branch = 0;
641	>	for (i = 0; i < 3; i++)
642	>	if (av->pos[i] > ck0[i] + s) {
643	>	ck0[i] += s;
644	>	branch |= 1 << i;
645	>	}
646	>	at = at->kid + branch;
647	>	}
648	>	avh.next = at->alist;           /* order by increasing level */
649	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
650	>	if ( ap->next->lvl > av->lvl ||
651	>	(ap->next->lvl == av->lvl) &
652	>	(ap->next->weight <= av->weight) )
653	>	break;
654	>	av->next = ap->next;
655	>	ap->next = (AMBVAL*)av;
656	>	at->alist = avh.next;
657	>	}
658	>
659	>
660	>	#else /* ! NEWAMB */
661	>
662	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
663	>	AMBTREE *at, FVECT c0, double s);
664	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
665	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
666	>
667	>
668	>	void
669	>	multambient(            /* compute ambient component & multiply by coef. */
670	>	COLOR  aval,
671	>	RAY  *r,
672	>	FVECT  nrm
673	>	)
674	>	{
675	>	static int  rdepth = 0;                 /* ambient recursion */
676	>	COLOR   acol, caustic;
677	>	double  d, l;
678	>
679	>	/* PMAP: Factor in ambient from global photon map (if enabled) and return
680	>	* as all ambient components accounted for */
681	>	if (ambPmap(aval, r, rdepth))
682	>	return;
683	>
684	>	/* PMAP: Otherwise factor in ambient from caustic photon map
685	>	* (ambPmapCaustic() returns zero if caustic photons disabled) and
686	>	* continue with RADIANCE ambient calculation */
687	>	copycolor(caustic, aval);
688	>	ambPmapCaustic(caustic, r, rdepth);
689	>
690	>	if (ambdiv <= 0)                        /* no ambient calculation */
691	>	goto dumbamb;
692	>	/* check number of bounces */
693	>	if (rdepth >= ambounce)
694	>	goto dumbamb;
695	>	/* check ambient list */
696	>	if (ambincl != -1 && r->ro != NULL &&
697	>	ambincl != inset(ambset, r->ro->omod))
698	>	goto dumbamb;
699	>
700	>	if (ambacc <= FTINY) {                  /* no ambient storage */
701	>	copycolor(acol, aval);
702	>	rdepth++;
703	>	d = doambient(acol, r, r->rweight, NULL, NULL);
704	>	rdepth--;
705	>	if (d <= FTINY)
706	>	goto dumbamb;
707	>	copycolor(aval, acol);
708	>
709	>	/* PMAP: add in caustic */
710	>	addcolor(aval, caustic);
711	>	return;
712	>	}
713	>
714	>	if (tracktime)                          /* sort to minimize thrashing */
715	>	sortambvals(0);
716	>	/* interpolate ambient value */
717	>	setcolor(acol, 0.0, 0.0, 0.0);
718	>	d = sumambient(acol, r, nrm, rdepth,
719	>	&atrunk, thescene.cuorg, thescene.cusize);
720	>
721	>	if (d > FTINY) {
722	>	d = 1.0/d;
723	>	scalecolor(acol, d);
724	>	multcolor(aval, acol);
725	>
726	>	/* PMAP: add in caustic */
727	>	addcolor(aval, caustic);
728	>	return;
729	>	}
730	>
731	>	rdepth++;                               /* need to cache new value */
732	>	d = makeambient(acol, r, nrm, rdepth-1);
733		rdepth--;
734	+
735	+	if (d > FTINY) {
736	+	multcolor(aval, acol);          /* got new value */
737	+
738	+	/* PMAP: add in caustic */
739	+	addcolor(aval, caustic);
740	+	return;
741	+	}
742	+
743	+	dumbamb:                                        /* return global value */
744	+	if ((ambvwt <= 0) | (navsum == 0)) {
745	+	multcolor(aval, ambval);
746	+
747	+	/* PMAP: add in caustic */
748	+	addcolor(aval, caustic);
749	+	return;
750	+	}
751	+
752	+	l = bright(ambval);                     /* average in computations */
753	+	if (l > FTINY) {
754	+	d = (log(l)*(double)ambvwt + avsum) /
755	+	(double)(ambvwt + navsum);
756	+	d = exp(d) / l;
757	+	scalecolor(aval, d);
758	+	multcolor(aval, ambval);        /* apply color of ambval */
759	+	} else {
760	+	d = exp( avsum / (double)navsum );
761	+	scalecolor(aval, d);            /* neutral color */
762	+	}
763		}
764
765
766	<	double
767	<	sumambient(acol, r, at, c0, s)          /* get interpolated ambient value */
768	<	COLOR  acol;
769	<	register RAY  *r;
770	<	AMBTREE  *at;
771	<	FVECT  c0;
772	<	double  s;
766	>	static double
767	>	sumambient(     /* get interpolated ambient value */
768	>	COLOR  acol,
769	>	RAY  *r,
770	>	FVECT  rn,
771	>	int  al,
772	>	AMBTREE  *at,
773	>	FVECT  c0,
774	>	double  s
775	>	)
776		{
777	<	extern double  sqrt();
161	<	double  d, e1, e2, wt, wsum;
777	>	double  d, e1, e2, wt, wsum;
778		COLOR  ct;
779		FVECT  ck0;
780		int  i;
781	<	register int  j;
782	<	register AMBVAL  *av;
783	<	/* do this node */
781	>	int  j;
782	>	AMBVAL   *av;
783	>
784		wsum = 0.0;
785	+	/* do this node */
786		for (av = at->alist; av != NULL; av = av->next) {
787	+	double  rn_dot = -2.0;
788	+	if (tracktime)
789	+	av->latick = ambclock;
790		/*
791	<	*  Ray strength test.
791	>	*  Ambient level test.
792		*/
793	<	if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY)
794	<	continue;
793	>	if (av->lvl > al ||     /* list sorted, so this works */
794	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
795	>	break;
796		/*
797		*  Ambient radius test.
798		*/
799	<	e1 = 0.0;
800	<	for (j = 0; j < 3; j++) {
180	<	d = av->pos[j] - r->rop[j];
181	<	e1 += d * d;
182	<	}
183	<	e1 /= av->rad * av->rad;
799	>	VSUB(ck0, av->pos, r->rop);
800	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
801		if (e1 > ambacc*ambacc*1.21)
802		continue;
803		/*
804	<	*  Normal direction test.
804	>	*  Direction test using closest normal.
805		*/
806	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
807	<	if (e2 < 0.0) e2 = 0.0;
808	<	if (e1 + e2 > ambacc*ambacc*1.21)
806	>	d = DOT(av->dir, r->ron);
807	>	if (rn != r->ron) {
808	>	rn_dot = DOT(av->dir, rn);
809	>	if (rn_dot > 1.0-FTINY)
810	>	rn_dot = 1.0-FTINY;
811	>	if (rn_dot >= d-FTINY) {
812	>	d = rn_dot;
813	>	rn_dot = -2.0;
814	>	}
815	>	}
816	>	e2 = (1.0 - d) * r->rweight;
817	>	if (e2 < 0.0)
818	>	e2 = 0.0;
819	>	else if (e1 + e2 > ambacc*ambacc*1.21)
820		continue;
821		/*
822		*  Ray behind test.
#	Line 197 | Line 825 | double  s;
825		for (j = 0; j < 3; j++)
826		d += (r->rop[j] - av->pos[j]) *
827		(av->dir[j] + r->ron[j]);
828	<	if (d < -minarad)
828	>	if (d*0.5 < -minarad*ambacc-.001)
829		continue;
830		/*
831		*  Jittering final test reduces image artifacts.
832		*/
833	<	wt = sqrt(e1) + sqrt(e2);
834	<	if (wt > ambacc*(0.9 + 0.2*frandom()))
833	>	e1 = sqrt(e1);
834	>	e2 = sqrt(e2);
835	>	wt = e1 + e2;
836	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
837		continue;
838	+	/*
839	+	*  Recompute directional error using perturbed normal
840	+	*/
841	+	if (rn_dot > 0.0) {
842	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
843	+	wt = e1 + e2;
844	+	}
845		if (wt <= 1e-3)
846		wt = 1e3;
847		else
848		wt = 1.0 / wt;
849		wsum += wt;
850	<	copycolor(ct, av->val);
850	>	extambient(ct, av, r->rop, rn);
851		scalecolor(ct, wt);
852		addcolor(acol, ct);
853		}
#	Line 229 | Line 866 | double  s;
866		break;
867		}
868		if (j == 3)
869	<	wsum += sumambient(acol, r, at->kid+i, ck0, s);
869	>	wsum += sumambient(acol, r, rn, al,
870	>	at->kid+i, ck0, s);
871		}
872		return(wsum);
873		}
874
875
876	<	double
877	<	makeambient(acol, r)            /* make a new ambient value */
878	<	COLOR  acol;
879	<	register RAY  *r;
876	>	static double
877	>	makeambient(            /* make a new ambient value for storage */
878	>	COLOR  acol,
879	>	RAY  *r,
880	>	FVECT  rn,
881	>	int  al
882	>	)
883		{
884	<	AMBVAL  amb;
884	>	AMBVAL  amb;
885	>	FVECT   gp, gd;
886	>	int     i;
887
888	<	amb.rad = doambient(acol, r);           /* compute ambient */
889	<	if (amb.rad == 0.0)
888	>	amb.weight = 1.0;                       /* compute weight */
889	>	for (i = al; i-- > 0; )
890	>	amb.weight *= AVGREFL;
891	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
892	>	amb.weight = 1.25*r->rweight;
893	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
894	>	/* compute ambient */
895	>	amb.rad = doambient(acol, r, amb.weight, gp, gd);
896	>	if (amb.rad <= FTINY) {
897	>	setcolor(acol, 0.0, 0.0, 0.0);
898		return(0.0);
899	<	/* store it */
899	>	}
900	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
901	>	/* store value */
902		VCOPY(amb.pos, r->rop);
903		VCOPY(amb.dir, r->ron);
904	<	amb.lvl = r->rlvl;
252	<	amb.weight = r->rweight;
904	>	amb.lvl = al;
905		copycolor(amb.val, acol);
906	+	VCOPY(amb.gpos, gp);
907	+	VCOPY(amb.gdir, gd);
908		/* insert into tree */
909	<	avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize);
910	<	avsave(&amb);                           /* write to file */
909	>	avsave(&amb);                           /* and save to file */
910	>	if (rn != r->ron)
911	>	extambient(acol, &amb, r->rop, rn);     /* texture */
912		return(amb.rad);
913		}
914
915
916	<	double
917	<	doambient(acol, r)                      /* compute ambient component */
918	<	COLOR  acol;
919	<	register RAY  *r;
916	>	static void
917	>	extambient(             /* extrapolate value at pv, nv */
918	>	COLOR  cr,
919	>	AMBVAL   *ap,
920	>	FVECT  pv,
921	>	FVECT  nv
922	>	)
923		{
924	<	extern int  ambcmp();
925	<	extern double  sin(), cos(), sqrt();
926	<	double  phi, xd, yd, zd;
269	<	double  b, b2;
270	<	register AMBSAMP  *div;
271	<	AMBSAMP  dnew;
272	<	RAY  ar;
273	<	FVECT  ux, uy;
274	<	double  arad;
275	<	int  ndivs, nt, np, ns, ne, i, j;
276	<	register int  k;
924	>	FVECT  v1;
925	>	int  i;
926	>	double  d;
927
928	<	setcolor(acol, 0.0, 0.0, 0.0);
929	<	/* set number of divisions */
930	<	nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5;
931	<	np = 2 * nt;
932	<	ndivs = nt * np;
933	<	/* check first */
934	<	if (ndivs == 0 || rayorigin(&ar, r, AMBIENT, 0.5) < 0)
935	<	return(0.0);
936	<	/* set number of super-samples */
937	<	ns = ambssamp * r->rweight + 0.5;
288	<	if (ns > 0) {
289	<	div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP));
290	<	if (div == NULL)
291	<	error(SYSTEM, "out of memory in doambient");
928	>	d = 1.0;                        /* zeroeth order */
929	>	/* gradient due to translation */
930	>	for (i = 0; i < 3; i++)
931	>	d += ap->gpos[i]*(pv[i]-ap->pos[i]);
932	>	/* gradient due to rotation */
933	>	VCROSS(v1, ap->dir, nv);
934	>	d += DOT(ap->gdir, v1);
935	>	if (d <= 0.0) {
936	>	setcolor(cr, 0.0, 0.0, 0.0);
937	>	return;
938		}
939	<	/* make axes */
940	<	uy[0] = uy[1] = uy[2] = 0.0;
941	<	for (k = 0; k < 3; k++)
942	<	if (r->ron[k] < 0.6 && r->ron[k] > -0.6)
939	>	copycolor(cr, ap->val);
940	>	scalecolor(cr, d);
941	>	}
942	>
943	>
944	>	static void
945	>	avinsert(                               /* insert ambient value in our tree */
946	>	AMBVAL *av
947	>	)
948	>	{
949	>	AMBTREE  *at;
950	>	AMBVAL  *ap;
951	>	AMBVAL  avh;
952	>	FVECT  ck0;
953	>	double  s;
954	>	int  branch;
955	>	int  i;
956	>
957	>	if (av->rad <= FTINY)
958	>	error(CONSISTENCY, "zero ambient radius in avinsert");
959	>	at = &atrunk;
960	>	VCOPY(ck0, thescene.cuorg);
961	>	s = thescene.cusize;
962	>	while (s*(OCTSCALE/2) > av->rad*ambacc) {
963	>	if (at->kid == NULL)
964	>	if ((at->kid = newambtree()) == NULL)
965	>	error(SYSTEM, "out of memory in avinsert");
966	>	s *= 0.5;
967	>	branch = 0;
968	>	for (i = 0; i < 3; i++)
969	>	if (av->pos[i] > ck0[i] + s) {
970	>	ck0[i] += s;
971	>	branch |= 1 << i;
972	>	}
973	>	at = at->kid + branch;
974	>	}
975	>	avh.next = at->alist;           /* order by increasing level */
976	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
977	>	if ( ap->next->lvl > av->lvl ||
978	>	(ap->next->lvl == av->lvl) &
979	>	(ap->next->weight <= av->weight) )
980		break;
981	<	uy[k] = 1.0;
982	<	fcross(ux, r->ron, uy);
983	<	normalize(ux);
984	<	fcross(uy, ux, r->ron);
985	<	/* sample divisions */
986	<	arad = 0.0;
987	<	ne = 0;
988	<	for (i = 0; i < nt; i++)
989	<	for (j = 0; j < np; j++) {
990	<	rayorigin(&ar, r, AMBIENT, 0.5);        /* pretested */
991	<	zd = sqrt((i+frandom())/nt);
992	<	phi = 2.0*PI * (j+frandom())/np;
993	<	xd = cos(phi) * zd;
994	<	yd = sin(phi) * zd;
995	<	zd = sqrt(1.0 - zd*zd);
996	<	for (k = 0; k < 3; k++)
997	<	ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k];
998	<	rayvalue(&ar);
999	<	if (ar.rot < FHUGE)
1000	<	arad += 1.0 / ar.rot;
1001	<	if (ns > 0) {                   /* save division */
1002	<	div[ne].k = 0.0;
1003	<	copycolor(div[ne].v, ar.rcol);
1004	<	div[ne].n = 0;
1005	<	div[ne].t = i; div[ne].p = j;
1006	<	/* sum errors */
1007	<	b = bright(ar.rcol);
1008	<	if (i > 0) {            /* from above */
1009	<	b2 = bright(div[ne-np].v) - b;
1010	<	b2 *= b2 * 0.25;
1011	<	div[ne].k += b2;
1012	<	div[ne].n++;
1013	<	div[ne-np].k += b2;
1014	<	div[ne-np].n++;
1015	<	}
1016	<	if (j > 0) {            /* from behind */
1017	<	b2 = bright(div[ne-1].v) - b;
1018	<	b2 *= b2 * 0.25;
1019	<	div[ne].k += b2;
1020	<	div[ne].n++;
1021	<	div[ne-1].k += b2;
1022	<	div[ne-1].n++;
1023	<	}
1024	<	if (j == np-1) {        /* around */
1025	<	b2 = bright(div[ne-(np-1)].v) - b;
1026	<	b2 *= b2 * 0.25;
1027	<	div[ne].k += b2;
1028	<	div[ne].n++;
1029	<	div[ne-(np-1)].k += b2;
1030	<	div[ne-(np-1)].n++;
1031	<	}
1032	<	ne++;
1033	<	} else
1034	<	addcolor(acol, ar.rcol);
1035	<	}
1036	<	for (k = 0; k < ne; k++) {              /* compute errors */
1037	<	if (div[k].n > 1)
1038	<	div[k].k /= div[k].n;
1039	<	div[k].n = 1;
981	>	av->next = ap->next;
982	>	ap->next = (AMBVAL*)av;
983	>	at->alist = avh.next;
984	>	}
985	>
986	>	#endif  /* ! NEWAMB */
987	>
988	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
989	>
990	>	static void
991	>	initambfile(            /* initialize ambient file */
992	>	int  cre8
993	>	)
994	>	{
995	>	extern char  *progname, *octname;
996	>	static char  *mybuf = NULL;
997	>
998	>	#ifdef  F_SETLKW
999	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
1000	>	#endif
1001	>	SET_FILE_BINARY(ambfp);
1002	>	if (mybuf == NULL)
1003	>	mybuf = (char *)bmalloc(BUFSIZ+8);
1004	>	setbuf(ambfp, mybuf);
1005	>	if (cre8) {                     /* new file */
1006	>	newheader("RADIANCE", ambfp);
1007	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
1008	>	progname, colval(ambval,RED),
1009	>	colval(ambval,GRN), colval(ambval,BLU),
1010	>	ambvwt, ambounce, ambacc);
1011	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
1012	>	ambdiv, ambssamp, ambres);
1013	>	if (octname != NULL)
1014	>	fputs(octname, ambfp);
1015	>	fputc('\n', ambfp);
1016	>	fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1017	>	fputnow(ambfp);
1018	>	fputformat(AMBFMT, ambfp);
1019	>	fputc('\n', ambfp);
1020	>	putambmagic(ambfp);
1021	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
1022	>	error(USER, "bad ambient file");
1023	>	}
1024	>
1025	>
1026	>	static void
1027	>	avsave(                         /* insert and save an ambient value */
1028	>	AMBVAL  *av
1029	>	)
1030	>	{
1031	>	avstore(av);
1032	>	if (ambfp == NULL)
1033	>	return;
1034	>	if (writambval(av, ambfp) < 0)
1035	>	goto writerr;
1036	>	if (++nunflshed >= AMBFLUSH)
1037	>	if (ambsync() == EOF)
1038	>	goto writerr;
1039	>	return;
1040	>	writerr:
1041	>	error(SYSTEM, "error writing to ambient file");
1042	>	}
1043	>
1044	>
1045	>	static AMBVAL *
1046	>	avstore(                                /* allocate memory and save aval */
1047	>	AMBVAL  *aval
1048	>	)
1049	>	{
1050	>	AMBVAL  *av;
1051	>	double  d;
1052	>
1053	>	if ((av = newambval()) == NULL)
1054	>	error(SYSTEM, "out of memory in avstore");
1055	>	*av = *aval;
1056	>	av->latick = ambclock;
1057	>	av->next = NULL;
1058	>	nambvals++;
1059	>	d = bright(av->val);
1060	>	if (d > FTINY) {                /* add to log sum for averaging */
1061	>	avsum += log(d);
1062	>	navsum++;
1063		}
1064	<	/* sort the divisions */
1065	<	qsort(div, ne, sizeof(AMBSAMP), ambcmp);
1066	<	/* skim excess */
1067	<	while (ne > ns) {
1068	<	ne--;
1069	<	addcolor(acol, div[ne].v);
1064	>	avinsert(av);                   /* insert in our cache tree */
1065	>	return(av);
1066	>	}
1067	>
1068	>
1069	>	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
1070	>
1071	>	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
1072	>
1073	>
1074	>	static AMBTREE *
1075	>	newambtree(void)                                /* allocate 8 ambient tree structs */
1076	>	{
1077	>	AMBTREE  *atp, *upperlim;
1078	>
1079	>	if (atfreelist == NULL) {       /* get more nodes */
1080	>	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
1081	>	if (atfreelist == NULL)
1082	>	return(NULL);
1083	>	/* link new free list */
1084	>	upperlim = atfreelist + 8*(ATALLOCSZ-1);
1085	>	for (atp = atfreelist; atp < upperlim; atp += 8)
1086	>	atp->kid = atp + 8;
1087	>	atp->kid = NULL;
1088		}
1089	<	/* super-sample */
1090	<	for (i = ns; i > 0; i--) {
1091	<	rayorigin(&ar, r, AMBIENT, 0.5);        /* pretested */
1092	<	zd = sqrt((div[0].t+frandom())/nt);
1093	<	phi = 2.0*PI * (div[0].p+frandom())/np;
370	<	xd = cos(phi) * zd;
371	<	yd = sin(phi) * zd;
372	<	zd = sqrt(1.0 - zd*zd);
373	<	for (k = 0; k < 3; k++)
374	<	ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k];
375	<	rayvalue(&ar);
376	<	if (ar.rot < FHUGE)
377	<	arad += 1.0 / ar.rot;
378	<	/* recompute error */
379	<	copycolor(dnew.v, div[0].v);
380	<	addcolor(dnew.v, ar.rcol);
381	<	dnew.n = div[0].n + 1;
382	<	dnew.t = div[0].t; dnew.p = div[0].p;
383	<	b2 = bright(dnew.v)/dnew.n - bright(ar.rcol);
384	<	b2 = b2*b2 + div[0].k*div[0].n;
385	<	dnew.k = b2/dnew.n;
386	<	/* reinsert */
387	<	for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++)
388	<	bcopy(&div[k+1], &div[k], sizeof(AMBSAMP));
389	<	bcopy(&dnew, &div[k], sizeof(AMBSAMP));
1089	>	atp = atfreelist;
1090	>	atfreelist = atp->kid;
1091	>	memset(atp, 0, 8*sizeof(AMBTREE));
1092	>	return(atp);
1093	>	}
1094
1095	<	if (ne >= i) {          /* extract darkest division */
1096	<	ne--;
1097	<	if (div[ne].n > 1)
1098	<	scalecolor(div[ne].v, 1.0/div[ne].n);
1099	<	addcolor(acol, div[ne].v);
1100	<	}
1095	>
1096	>	static void
1097	>	freeambtree(                    /* free 8 ambient tree structs */
1098	>	AMBTREE  *atp
1099	>	)
1100	>	{
1101	>	atp->kid = atfreelist;
1102	>	atfreelist = atp;
1103	>	}
1104	>
1105	>
1106	>	static void
1107	>	unloadatree(                    /* unload an ambient value tree */
1108	>	AMBTREE  *at,
1109	>	unloadtf_t *f
1110	>	)
1111	>	{
1112	>	AMBVAL  *av;
1113	>	int  i;
1114	>	/* transfer values at this node */
1115	>	for (av = at->alist; av != NULL; av = at->alist) {
1116	>	at->alist = av->next;
1117	>	av->next = NULL;
1118	>	(*f)(av);
1119		}
1120	<	scalecolor(acol, 1.0/ndivs);
1121	<	if (arad <= FTINY)
1122	<	arad = FHUGE;
1123	<	else
1124	<	arad = (ndivs+ns) / arad / sqrt(r->rweight);
1125	<	if (arad > maxarad)
404	<	arad = maxarad;
405	<	else if (arad < minarad)
406	<	arad = minarad;
407	<	if (ns > 0)
408	<	free((char *)div);
409	<	return(arad);
1120	>	if (at->kid == NULL)
1121	>	return;
1122	>	for (i = 0; i < 8; i++)         /* transfer and free children */
1123	>	unloadatree(at->kid+i, f);
1124	>	freeambtree(at->kid);
1125	>	at->kid = NULL;
1126		}
1127
1128
1129	+	static struct avl {
1130	+	AMBVAL  *p;
1131	+	unsigned long   t;
1132	+	}       *avlist1;                       /* ambient value list with ticks */
1133	+	static AMBVAL   **avlist2;              /* memory positions for sorting */
1134	+	static int      i_avlist;               /* index for lists */
1135	+
1136	+	static int alatcmp(const void *av1, const void *av2);
1137	+
1138	+	static void
1139	+	avfree(AMBVAL *av)
1140	+	{
1141	+	free(av);
1142	+	}
1143	+
1144	+	static void
1145	+	av2list(
1146	+	AMBVAL *av
1147	+	)
1148	+	{
1149	+	#ifdef DEBUG
1150	+	if (i_avlist >= nambvals)
1151	+	error(CONSISTENCY, "too many ambient values in av2list1");
1152	+	#endif
1153	+	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1154	+	avlist1[i_avlist++].t = av->latick;
1155	+	}
1156	+
1157	+
1158		static int
1159	<	ambcmp(d1, d2)                          /* decreasing order */
1160	<	AMBSAMP  *d1, *d2;
1159	>	alatcmp(                        /* compare ambient values for MRA */
1160	>	const void *av1,
1161	>	const void *av2
1162	>	)
1163		{
1164	<	if (d1->k < d2->k)
1165	<	return(1);
1166	<	if (d1->k > d2->k)
1164	>	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1165	>	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1166	>	}
1167	>
1168	>
1169	>	/* GW NOTE 2002/10/3:
1170	>	* I used to compare AMBVAL pointers, but found that this was the
1171	>	* cause of a serious consistency error with gcc, since the optimizer
1172	>	* uses some dangerous trick in pointer subtraction that
1173	>	* assumes pointers differ by exact struct size increments.
1174	>	*/
1175	>	static int
1176	>	aposcmp(                        /* compare ambient value positions */
1177	>	const void      *avp1,
1178	>	const void      *avp2
1179	>	)
1180	>	{
1181	>	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1182	>	if (diff < 0)
1183		return(-1);
1184	<	return(0);
1184	>	return(diff > 0);
1185		}
1186
1187
1188	<	static
1189	<	avsave(av)                              /* save an ambient value */
1190	<	AMBVAL  *av;
1188	>	static int
1189	>	avlmemi(                                /* find list position from address */
1190	>	AMBVAL  *avaddr
1191	>	)
1192		{
1193	<	#ifdef  AMBFLUSH
1194	<	static int  nunflshed = 0;
1195	<	#endif
1196	<	if (ambfp == NULL)
1193	>	AMBVAL  **avlpp;
1194	>
1195	>	avlpp = (AMBVAL **)bsearch(&avaddr, avlist2,
1196	>	nambvals, sizeof(AMBVAL *), aposcmp);
1197	>	if (avlpp == NULL)
1198	>	error(CONSISTENCY, "address not found in avlmemi");
1199	>	return(avlpp - avlist2);
1200	>	}
1201	>
1202	>
1203	>	static void
1204	>	sortambvals(                    /* resort ambient values */
1205	>	int     always
1206	>	)
1207	>	{
1208	>	AMBTREE  oldatrunk;
1209	>	AMBVAL  tav, *tap, *pnext;
1210	>	int     i, j;
1211	>	/* see if it's time yet */
1212	>	if (!always && (ambclock++ < lastsort+sortintvl ||
1213	>	nambvals < SORT_THRESH))
1214		return;
1215	<	if (fwrite(av, sizeof(AMBVAL), 1, ambfp) != 1)
1216	<	goto writerr;
1217	<	#ifdef  AMBFLUSH
1218	<	if (++nunflshed >= AMBFLUSH) {
1219	<	if (fflush(ambfp) == EOF)
1220	<	goto writerr;
1221	<	nunflshed = 0;
1215	>	/*
1216	>	* The idea here is to minimize memory thrashing
1217	>	* in VM systems by improving reference locality.
1218	>	* We do this by periodically sorting our stored ambient
1219	>	* values in memory in order of most recently to least
1220	>	* recently accessed.  This ordering was chosen so that new
1221	>	* ambient values (which tend to be less important) go into
1222	>	* higher memory with the infrequently accessed values.
1223	>	*      Since we expect our values to need sorting less
1224	>	* frequently as the process continues, we double our
1225	>	* waiting interval after each call.
1226	>	*      This routine is also called by setambacc() with
1227	>	* the "always" parameter set to 1 so that the ambient
1228	>	* tree will be rebuilt with the new accuracy parameter.
1229	>	*/
1230	>	if (tracktime) {                /* allocate pointer arrays to sort */
1231	>	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1232	>	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1233	>	} else {
1234	>	avlist2 = NULL;
1235	>	avlist1 = NULL;
1236		}
1237	+	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1238	+	if (avlist2 != NULL)
1239	+	free(avlist2);
1240	+	if (always) {           /* rebuild without sorting */
1241	+	oldatrunk = atrunk;
1242	+	atrunk.alist = NULL;
1243	+	atrunk.kid = NULL;
1244	+	unloadatree(&oldatrunk, avinsert);
1245	+	}
1246	+	} else {                        /* sort memory by last access time */
1247	+	/*
1248	+	* Sorting memory is tricky because it isn't contiguous.
1249	+	* We have to sort an array of pointers by MRA and also
1250	+	* by memory position.  We then copy values in "loops"
1251	+	* to minimize memory hits.  Nevertheless, we will visit
1252	+	* everyone at least twice, and this is an expensive process
1253	+	* when we're thrashing, which is when we need to do it.
1254	+	*/
1255	+	#ifdef DEBUG
1256	+	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1257	+	nambvals, ambclock);
1258	+	eputs(errmsg);
1259		#endif
1260	<	return;
1261	<	writerr:
1262	<	error(SYSTEM, "error writing ambient file");
1260	>	i_avlist = 0;
1261	>	unloadatree(&atrunk, av2list);  /* empty current tree */
1262	>	#ifdef DEBUG
1263	>	if (i_avlist < nambvals)
1264	>	error(CONSISTENCY, "missing ambient values in sortambvals");
1265	>	#endif
1266	>	qsort(avlist1, nambvals, sizeof(struct avl), alatcmp);
1267	>	qsort(avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1268	>	for (i = 0; i < nambvals; i++) {
1269	>	if (avlist1[i].p == NULL)
1270	>	continue;
1271	>	tap = avlist2[i];
1272	>	tav = *tap;
1273	>	for (j = i; (pnext = avlist1[j].p) != tap;
1274	>	j = avlmemi(pnext)) {
1275	>	*(avlist2[j]) = *pnext;
1276	>	avinsert(avlist2[j]);
1277	>	avlist1[j].p = NULL;
1278	>	}
1279	>	*(avlist2[j]) = tav;
1280	>	avinsert(avlist2[j]);
1281	>	avlist1[j].p = NULL;
1282	>	}
1283	>	free(avlist1);
1284	>	free(avlist2);
1285	>	/* compute new sort interval */
1286	>	sortintvl = ambclock - lastsort;
1287	>	if (sortintvl >= MAX_SORT_INTVL/2)
1288	>	sortintvl = MAX_SORT_INTVL;
1289	>	else
1290	>	sortintvl <<= 1;        /* wait twice as long next */
1291	>	#ifdef DEBUG
1292	>	eputs("done\n");
1293	>	#endif
1294	>	}
1295	>	if (ambclock >= MAXACLOCK)
1296	>	ambclock = MAXACLOCK/2;
1297	>	lastsort = ambclock;
1298		}
1299
1300
1301	<	static
1302	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
1303	<	AMBVAL  *aval;
1304	<	register AMBTREE  *at;
1305	<	FVECT  c0;
1306	<	double  s;
1301	>	#ifdef  F_SETLKW
1302	>
1303	>	static void
1304	>	aflock(                 /* lock/unlock ambient file */
1305	>	int  typ
1306	>	)
1307		{
1308	<	FVECT  ck0;
457	<	int  branch;
458	<	register AMBVAL  *av;
459	<	register int  i;
1308	>	static struct flock  fls;       /* static so initialized to zeroes */
1309
1310	<	if ((av = newambval()) == NULL)
1311	<	goto memerr;
1312	<	bcopy(aval, av, sizeof(AMBVAL));
1313	<	VCOPY(ck0, c0);
1314	<	while (s*(OCTSCALE/2) > av->rad*ambacc) {
1315	<	if (at->kid == NULL)
1316	<	if ((at->kid = newambtree()) == NULL)
1317	<	goto memerr;
1318	<	s *= 0.5;
1319	<	branch = 0;
1320	<	for (i = 0; i < 3; i++)
1321	<	if (av->pos[i] > ck0[i] + s) {
1322	<	ck0[i] += s;
1323	<	branch |= 1 << i;
1310	>	if (typ == fls.l_type)          /* already called? */
1311	>	return;
1312	>	fls.l_type = typ;
1313	>	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1314	>	error(SYSTEM, "cannot (un)lock ambient file");
1315	>	}
1316	>
1317	>
1318	>	int
1319	>	ambsync(void)                   /* synchronize ambient file */
1320	>	{
1321	>	long  flen;
1322	>	AMBVAL  avs;
1323	>	int  n;
1324	>
1325	>	if (ambfp == NULL)      /* no ambient file? */
1326	>	return(0);
1327	>	/* gain appropriate access */
1328	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1329	>	/* see if file has grown */
1330	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1331	>	goto seekerr;
1332	>	if ((n = flen - lastpos) > 0) {         /* file has grown */
1333	>	if (ambinp == NULL) {           /* get new file pointer */
1334	>	ambinp = fopen(ambfile, "rb");
1335	>	if (ambinp == NULL)
1336	>	error(SYSTEM, "fopen failed in ambsync");
1337	>	}
1338	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1339	>	goto seekerr;
1340	>	while (n >= AMBVALSIZ) {        /* load contributed values */
1341	>	if (!readambval(&avs, ambinp)) {
1342	>	sprintf(errmsg,
1343	>	"ambient file \"%s\" corrupted near character %ld",
1344	>	ambfile, flen - n);
1345	>	error(WARNING, errmsg);
1346	>	break;
1347		}
1348	<	at = at->kid + branch;
1348	>	avstore(&avs);
1349	>	n -= AMBVALSIZ;
1350	>	}
1351	>	lastpos = flen - n;             /* check alignment */
1352	>	if (n && lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1353	>	goto seekerr;
1354		}
1355	<	av->next = at->alist;
1356	<	at->alist = av;
1357	<	return;
1358	<	memerr:
1359	<	error(SYSTEM, "out of memory in avinsert");
1355	>	n = fflush(ambfp);                      /* calls write() at last */
1356	>	lastpos += (long)nunflshed*AMBVALSIZ;
1357	>	aflock(F_UNLCK);                        /* release file */
1358	>	nunflshed = 0;
1359	>	return(n);
1360	>	seekerr:
1361	>	error(SYSTEM, "seek failed in ambsync");
1362	>	return(EOF);    /* pro forma return */
1363		}
1364	+
1365	+	#else   /* ! F_SETLKW */
1366	+
1367	+	int
1368	+	ambsync(void)                   /* flush ambient file */
1369	+	{
1370	+	if (ambfp == NULL)
1371	+	return(0);
1372	+	nunflshed = 0;
1373	+	return(fflush(ambfp));
1374	+	}
1375	+
1376	+	#endif  /* ! F_SETLKW */

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