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

Comparing ray/src/rt/ambient.c (file contents):
Revision 1.2 by greg, Tue Feb 21 14:34:08 1989 UTC vs.
Revision 2.104 by greg, Fri Jan 27 22:00:49 2017 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  "resolu.h"
16	+	#include  "ambient.h"
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	<	extern CUBE  thescene;          /* contains space boundaries */
24	>	extern char  *shm_boundary;     /* memory sharing boundary */
25
26	<	extern COLOR  ambval;           /* global ambient component */
27	<	extern double  ambacc;          /* ambient accuracy */
28	<	extern int  ambres;             /* ambient resolution */
29	<	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 */
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	<	OBJECT  ambset[128];            /* ambient include/exclude set */
31	>	double  maxarad;                /* maximum ambient radius */
32	>	double  minarad;                /* minimum ambient radius */
33
34	<	double  maxarad;                /* maximum ambient radius */
38	<	double  minarad;                /* minimum ambient radius */
34	>	static AMBTREE  atrunk;         /* our ambient trunk node */
35
36	<	typedef struct ambval {
37	<	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 */
36	>	static FILE  *ambfp = NULL;     /* ambient file pointer */
37	>	static int  nunflshed = 0;      /* number of unflushed ambient values */
38
39	<	typedef struct ambtree {
40	<	AMBVAL  *alist;         /* ambient value list */
41	<	struct ambtree  *kid;   /* 8 child nodes */
42	<	}  AMBTREE;                     /* ambient octree */
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
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 */
53
54	<	static AMBTREE  atrunk;         /* our ambient trunk node */
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	<	static FILE  *ambfp = NULL;     /* ambient file pointer */
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  newambval()    (AMBVAL *)bmalloc(sizeof(AMBVAL))
76	>	#define  AMBFLUSH       (BUFSIZ/AMBVALSIZ)
77
78	<	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
78	>	#define  newambval()    (AMBVAL *)malloc(sizeof(AMBVAL))
79
80	<	double  sumambient(), doambient(), makeambient();
80	>	static void initambfile(int creat);
81	>	static void avsave(AMBVAL *av);
82	>	static AMBVAL *avstore(AMBVAL  *aval);
83	>	static AMBTREE *newambtree(void);
84	>	static void freeambtree(AMBTREE  *atp);
85
86	+	typedef void unloadtf_t(AMBVAL *);
87	+	static unloadtf_t avinsert;
88	+	static unloadtf_t av2list;
89	+	static unloadtf_t avfree;
90	+	static void unloadatree(AMBTREE  *at, unloadtf_t *f);
91
92	<	setambient(afile)                       /* initialize calculation */
93	<	char  *afile;
92	>	static int aposcmp(const void *avp1, const void *avp2);
93	>	static int avlmemi(AMBVAL *avaddr);
94	>	static void sortambvals(int always);
95	>
96	>	#ifdef  F_SETLKW
97	>	static void aflock(int  typ);
98	>	#endif
99	>
100	>
101	>	void
102	>	setambres(                              /* set ambient resolution */
103	>	int  ar
104	>	)
105		{
106	<	long  ftell();
107	<	char  **amblp;
108	<	OBJECT  obj;
109	<	AMBVAL  amb;
110	<	/* set up ambient set */
111	<	ambset[0] = 0;
112	<	for (amblp = amblist; *amblp != NULL; amblp++) {
113	<	if ((obj = modifier(*amblp)) == OVOID) {
114	<	sprintf(errmsg, "unknown %s modifier \"%s\"",
115	<	ambincl ? "include" : "exclude", *amblp);
106	>	ambres = ar < 0 ? 0 : ar;               /* may be done already */
107	>	/* set min & max radii */
108	>	if (ar <= 0) {
109	>	minarad = 0;
110	>	maxarad = thescene.cusize*0.2;
111	>	} else {
112	>	minarad = thescene.cusize / ar;
113	>	maxarad = 64.0 * minarad;               /* heuristic */
114	>	if (maxarad > thescene.cusize*0.2)
115	>	maxarad = thescene.cusize*0.2;
116	>	}
117	>	if (minarad <= FTINY)
118	>	minarad = 10.0*FTINY;
119	>	if (maxarad <= minarad)
120	>	maxarad = 64.0 * minarad;
121	>	}
122	>
123	>
124	>	void
125	>	setambacc(                              /* set ambient accuracy */
126	>	double  newa
127	>	)
128	>	{
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 ((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	<	continue;
173	>	fclose(ambfp);          /* close file so no writes */
174	>	ambfp = NULL;
175	>	return;                 /* avoid ambsync() */
176		}
177	<	if (!inset(ambset, obj))
178	<	insertelem(ambset, obj);
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	<	maxarad = thescene.cusize / 2.0;                /* maximum radius */
197	<	/* minimum radius */
198	<	minarad = ambres > 0 ? thescene.cusize/ambres : 0.0;
196	>	#ifdef  F_SETLKW
197	>	aflock(F_UNLCK);                        /* release file */
198	>	#endif
199	>	}
200
201	<	/* open ambient file */
202	<	if (afile != NULL)
203	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
204	<	while (fread(&amb, sizeof(AMBVAL), 1, ambfp) == 1)
205	<	avinsert(&amb, &atrunk, thescene.cuorg,
206	<	thescene.cusize);
207	<	/* align */
208	<	fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1);
209	<	} else if ((ambfp = fopen(afile, "w")) == NULL) {
210	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
211	<	afile);
107	<	error(SYSTEM, errmsg);
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	<	ambient(acol, r)                /* compute ambient component for ray */
229	<	COLOR  acol;
230	<	register RAY  *r;
228	>	void
229	>	ambnotify(                      /* record new modifier */
230	>	OBJECT  obj
231	>	)
232		{
233	+	static int  hitlimit = 0;
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++)
246	+	if (!strcmp(o->oname, *amblp)) {
247	+	if (ambset[0] >= MAXASET) {
248	+	error(WARNING, "too many modifiers in ambient list");
249	+	hitlimit++;
250	+	return;         /* should this be fatal? */
251	+	}
252	+	insertelem(ambset, obj);
253	+	return;
254	+	}
255	+	}
256	+
257	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
258	+
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  wsum;
278	>	COLOR   acol, caustic;
279	>	int     i, ok;
280	>	double  d, l;
281
282	<	rdepth++;                               /* increment level */
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 */
297	<	if (rdepth > ambounce)
297	>	if (rdepth >= ambounce)
298		goto dumbamb;
299		/* check ambient list */
300		if (ambincl != -1 && r->ro != NULL &&
#	Line 129 | Line 302 | register RAY  *r;
302		goto dumbamb;
303
304		if (ambacc <= FTINY) {                  /* no ambient storage */
305	<	if (doambient(acol, r) == 0.0)
305	>	FVECT   uvd[2];
306	>	float   dgrad[2], *dgp = NULL;
307	>
308	>	if (nrm != r->ron && DOT(nrm,r->ron) < 0.9999)
309	>	dgp = dgrad;            /* compute rotational grad. */
310	>	copycolor(acol, aval);
311	>	rdepth++;
312	>	ok = doambient(acol, r, r->rweight,
313	>	uvd, NULL, NULL, dgp, NULL);
314	>	rdepth--;
315	>	if (!ok)
316		goto dumbamb;
317	<	goto done;
317	>	if ((ok > 0) & (dgp != NULL)) { /* apply texture */
318	>	FVECT   v1;
319	>	VCROSS(v1, r->ron, nrm);
320	>	d = 1.0;
321	>	for (i = 3; i--; )
322	>	d += v1[i] * (dgp[0]*uvd[0][i] + dgp[1]*uvd[1][i]);
323	>	if (d >= 0.05)
324	>	scalecolor(acol, d);
325	>	}
326	>	copycolor(aval, acol);
327	>
328	>	/* PMAP: add in caustic */
329	>	addcolor(aval, caustic);
330	>	return;
331		}
332	<	/* get ambient value */
332	>
333	>	if (tracktime)                          /* sort to minimize thrashing */
334	>	sortambvals(0);
335	>	/* interpolate ambient value */
336		setcolor(acol, 0.0, 0.0, 0.0);
337	<	wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize);
338	<	if (wsum > FTINY)
339	<	scalecolor(acol, 1.0/wsum);
340	<	else if (makeambient(acol, r) == 0.0)
341	<	goto dumbamb;
342	<	goto done;
337	>	d = sumambient(acol, r, nrm, rdepth,
338	>	&atrunk, thescene.cuorg, thescene.cusize);
339	>
340	>	if (d > FTINY) {
341	>	d = 1.0/d;
342	>	scalecolor(acol, d);
343	>	multcolor(aval, acol);
344
345	+	/* PMAP: add in caustic */
346	+	addcolor(aval, caustic);
347	+	return;
348	+	}
349	+
350	+	rdepth++;                               /* need to cache new value */
351	+	ok = makeambient(acol, r, nrm, rdepth-1);
352	+	rdepth--;
353	+
354	+	if (ok) {
355	+	multcolor(aval, acol);          /* computed new value */
356	+
357	+	/* PMAP: add in caustic */
358	+	addcolor(aval, caustic);
359	+	return;
360	+	}
361	+
362		dumbamb:                                        /* return global value */
363	<	copycolor(acol, ambval);
364	<	done:                                           /* must finish here! */
363	>	if ((ambvwt <= 0) | (navsum == 0)) {
364	>	multcolor(aval, ambval);
365	>
366	>	/* PMAP: add in caustic */
367	>	addcolor(aval, caustic);
368	>	return;
369	>	}
370	>
371	>	l = bright(ambval);                     /* average in computations */
372	>	if (l > FTINY) {
373	>	d = (log(l)*(double)ambvwt + avsum) /
374	>	(double)(ambvwt + navsum);
375	>	d = exp(d) / l;
376	>	scalecolor(aval, d);
377	>	multcolor(aval, ambval);        /* apply color of ambval */
378	>	} else {
379	>	d = exp( avsum / (double)navsum );
380	>	scalecolor(aval, d);            /* neutral color */
381	>	}
382	>	}
383	>
384	>
385	>	/* Plug a potential leak where ambient cache value is occluded */
386	>	static int
387	>	plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
388	>	{
389	>	const double    cost70sq = 0.1169778;   /* cos(70deg)^2 */
390	>	RAY             rtst;
391	>	FVECT           vdif;
392	>	double          normdot, ndotd, nadotd;
393	>	double          a, b, c, t[2];
394	>
395	>	ang += 2.*PI*(ang < 0);                 /* check direction flags */
396	>	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
397	>	return(0);
398	>	/*
399	>	* Generate test ray, targeting 20 degrees above sample point plane
400	>	* along surface normal from cache position.  This should be high
401	>	* enough to miss local geometry we don't really care about.
402	>	*/
403	>	VSUB(vdif, ap->pos, r->rop);
404	>	normdot = DOT(anorm, r->ron);
405	>	ndotd = DOT(vdif, r->ron);
406	>	nadotd = DOT(vdif, anorm);
407	>	a = normdot*normdot - cost70sq;
408	>	b = 2.0*(normdot*ndotd - nadotd*cost70sq);
409	>	c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq;
410	>	if (quadratic(t, a, b, c) != 2)
411	>	return(1);                      /* should rarely happen */
412	>	if (t[1] <= FTINY)
413	>	return(0);                      /* should fail behind test */
414	>	rayorigin(&rtst, SHADOW, r, NULL);
415	>	VSUM(rtst.rdir, vdif, anorm, t[1]);     /* further dist. > plane */
416	>	rtst.rmax = normalize(rtst.rdir);       /* short ray test */
417	>	while (localhit(&rtst, &thescene)) {    /* check for occluder */
418	>	if (rtst.ro->omod != OVOID &&
419	>	(rtst.clipset == NULL ||
420	>	!inset(rtst.clipset, rtst.ro->omod)))
421	>	return(1);              /* plug light leak */
422	>	VCOPY(rtst.rorg, rtst.rop);     /* skip invisible surface */
423	>	rtst.rmax -= rtst.rot;
424	>	rayclear(&rtst);
425	>	}
426	>	return(0);                              /* seems we're OK */
427	>	}
428	>
429	>
430	>	static double
431	>	sumambient(             /* get interpolated ambient value */
432	>	COLOR  acol,
433	>	RAY  *r,
434	>	FVECT  rn,
435	>	int  al,
436	>	AMBTREE  *at,
437	>	FVECT  c0,
438	>	double  s
439	>	)
440	>	{                       /* initial limit is 10 degrees plus ambacc radians */
441	>	const double    minangle = 10.0 * PI/180.;
442	>	double          maxangle = minangle + ambacc;
443	>	double          wsum = 0.0;
444	>	FVECT           ck0;
445	>	int             i, j;
446	>	AMBVAL          *av;
447	>
448	>	if (at->kid != NULL) {          /* sum children first */
449	>	s *= 0.5;
450	>	for (i = 0; i < 8; i++) {
451	>	for (j = 0; j < 3; j++) {
452	>	ck0[j] = c0[j];
453	>	if (1<<j & i)
454	>	ck0[j] += s;
455	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
456	>	break;
457	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
458	>	break;
459	>	}
460	>	if (j == 3)
461	>	wsum += sumambient(acol, r, rn, al,
462	>	at->kid+i, ck0, s);
463	>	}
464	>	/* good enough? */
465	>	if (wsum >= 0.05 && s > minarad*10.0)
466	>	return(wsum);
467	>	}
468	>	/* adjust maximum angle */
469	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
470	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
471	>	/* sum this node */
472	>	for (av = at->alist; av != NULL; av = av->next) {
473	>	double  u, v, d, delta_r2, delta_t2;
474	>	COLOR   ct;
475	>	FVECT   uvw[3];
476	>	/* record access */
477	>	if (tracktime)
478	>	av->latick = ambclock;
479	>	/*
480	>	*  Ambient level test
481	>	*/
482	>	if (av->lvl > al ||     /* list sorted, so this works */
483	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
484	>	break;
485	>	/*
486	>	*  Direction test using unperturbed normal
487	>	*/
488	>	decodedir(uvw[2], av->ndir);
489	>	d = DOT(uvw[2], r->ron);
490	>	if (d <= 0.0)           /* >= 90 degrees */
491	>	continue;
492	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
493	>	if (delta_r2 >= maxangle*maxangle)
494	>	continue;
495	>	/*
496	>	*  Modified ray behind test
497	>	*/
498	>	VSUB(ck0, r->rop, av->pos);
499	>	d = DOT(ck0, uvw[2]);
500	>	if (d < -minarad*ambacc-.001)
501	>	continue;
502	>	d /= av->rad[0];
503	>	delta_t2 = d*d;
504	>	if (delta_t2 >= ambacc*ambacc)
505	>	continue;
506	>	/*
507	>	*  Elliptical radii test based on Hessian
508	>	*/
509	>	decodedir(uvw[0], av->udir);
510	>	VCROSS(uvw[1], uvw[2], uvw[0]);
511	>	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
512	>	delta_t2 += d*d;
513	>	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
514	>	delta_t2 += d*d;
515	>	if (delta_t2 >= ambacc*ambacc)
516	>	continue;
517	>	/*
518	>	*  Test for potential light leak
519	>	*/
520	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
521	>	continue;
522	>	/*
523	>	*  Extrapolate value and compute final weight (hat function)
524	>	*/
525	>	if (!extambient(ct, av, r->rop, rn, uvw))
526	>	continue;
527	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
528	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
529	>	scalecolor(ct, d);
530	>	addcolor(acol, ct);
531	>	wsum += d;
532	>	}
533	>	return(wsum);
534	>	}
535	>
536	>
537	>	static int
538	>	makeambient(            /* make a new ambient value for storage */
539	>	COLOR  acol,
540	>	RAY  *r,
541	>	FVECT  rn,
542	>	int  al
543	>	)
544	>	{
545	>	AMBVAL  amb;
546	>	FVECT   uvw[3];
547	>	int     i;
548	>
549	>	amb.weight = 1.0;                       /* compute weight */
550	>	for (i = al; i-- > 0; )
551	>	amb.weight *= AVGREFL;
552	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
553	>	amb.weight = 1.25*r->rweight;
554	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
555	>	/* compute ambient */
556	>	i = doambient(acol, r, amb.weight,
557	>	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
558	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
559	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
560	>	return(i);
561	>	/* store value */
562	>	VCOPY(amb.pos, r->rop);
563	>	amb.ndir = encodedir(r->ron);
564	>	amb.udir = encodedir(uvw[0]);
565	>	amb.lvl = al;
566	>	copycolor(amb.val, acol);
567	>	/* insert into tree */
568	>	avsave(&amb);                           /* and save to file */
569	>	if (rn != r->ron) {                     /* texture */
570	>	VCOPY(uvw[2], r->ron);
571	>	extambient(acol, &amb, r->rop, rn, uvw);
572	>	}
573	>	return(1);
574	>	}
575	>
576	>
577	>	static int
578	>	extambient(             /* extrapolate value at pv, nv */
579	>	COLOR  cr,
580	>	AMBVAL   *ap,
581	>	FVECT  pv,
582	>	FVECT  nv,
583	>	FVECT  uvw[3]
584	>	)
585	>	{
586	>	const double    min_d = 0.05;
587	>	static FVECT    my_uvw[3];
588	>	FVECT           v1;
589	>	int             i;
590	>	double          d = 1.0;        /* zeroeth order */
591	>
592	>	if (uvw == NULL) {              /* need local coordinates? */
593	>	decodedir(my_uvw[2], ap->ndir);
594	>	decodedir(my_uvw[0], ap->udir);
595	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
596	>	uvw = my_uvw;
597	>	}
598	>	for (i = 3; i--; )              /* gradient due to translation */
599	>	d += (pv[i] - ap->pos[i]) *
600	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
601	>
602	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
603	>	for (i = 3; i--; )
604	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
605	>
606	>	if (d < min_d)                  /* should not use if we can avoid it */
607	>	d = min_d;
608	>	copycolor(cr, ap->val);
609	>	scalecolor(cr, d);
610	>	return(d > min_d);
611	>	}
612	>
613	>
614	>	static void
615	>	avinsert(                               /* insert ambient value in our tree */
616	>	AMBVAL *av
617	>	)
618	>	{
619	>	AMBTREE  *at;
620	>	AMBVAL  *ap;
621	>	AMBVAL  avh;
622	>	FVECT  ck0;
623	>	double  s;
624	>	int  branch;
625	>	int  i;
626	>
627	>	if (av->rad[0] <= FTINY)
628	>	error(CONSISTENCY, "zero ambient radius in avinsert");
629	>	at = &atrunk;
630	>	VCOPY(ck0, thescene.cuorg);
631	>	s = thescene.cusize;
632	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
633	>	if (at->kid == NULL)
634	>	if ((at->kid = newambtree()) == NULL)
635	>	error(SYSTEM, "out of memory in avinsert");
636	>	s *= 0.5;
637	>	branch = 0;
638	>	for (i = 0; i < 3; i++)
639	>	if (av->pos[i] > ck0[i] + s) {
640	>	ck0[i] += s;
641	>	branch |= 1 << i;
642	>	}
643	>	at = at->kid + branch;
644	>	}
645	>	avh.next = at->alist;           /* order by increasing level */
646	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
647	>	if ( ap->next->lvl > av->lvl ||
648	>	(ap->next->lvl == av->lvl) &
649	>	(ap->next->weight <= av->weight) )
650	>	break;
651	>	av->next = ap->next;
652	>	ap->next = (AMBVAL*)av;
653	>	at->alist = avh.next;
654	>	}
655	>
656	>
657	>	#else /* ! NEWAMB */
658	>
659	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
660	>	AMBTREE *at, FVECT c0, double s);
661	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
662	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
663	>
664	>
665	>	void
666	>	multambient(            /* compute ambient component & multiply by coef. */
667	>	COLOR  aval,
668	>	RAY  *r,
669	>	FVECT  nrm
670	>	)
671	>	{
672	>	static int  rdepth = 0;                 /* ambient recursion */
673	>	COLOR   acol, caustic;
674	>	double  d, l;
675	>
676	>	/* PMAP: Factor in ambient from global photon map (if enabled) and return
677	>	* as all ambient components accounted for */
678	>	if (ambPmap(aval, r, rdepth))
679	>	return;
680	>
681	>	/* PMAP: Otherwise factor in ambient from caustic photon map
682	>	* (ambPmapCaustic() returns zero if caustic photons disabled) and
683	>	* continue with RADIANCE ambient calculation */
684	>	copycolor(caustic, aval);
685	>	ambPmapCaustic(caustic, r, rdepth);
686	>
687	>	if (ambdiv <= 0)                        /* no ambient calculation */
688	>	goto dumbamb;
689	>	/* check number of bounces */
690	>	if (rdepth >= ambounce)
691	>	goto dumbamb;
692	>	/* check ambient list */
693	>	if (ambincl != -1 && r->ro != NULL &&
694	>	ambincl != inset(ambset, r->ro->omod))
695	>	goto dumbamb;
696	>
697	>	if (ambacc <= FTINY) {                  /* no ambient storage */
698	>	copycolor(acol, aval);
699	>	rdepth++;
700	>	d = doambient(acol, r, r->rweight, NULL, NULL);
701	>	rdepth--;
702	>	if (d <= FTINY)
703	>	goto dumbamb;
704	>	copycolor(aval, acol);
705	>
706	>	/* PMAP: add in caustic */
707	>	addcolor(aval, caustic);
708	>	return;
709	>	}
710	>
711	>	if (tracktime)                          /* sort to minimize thrashing */
712	>	sortambvals(0);
713	>	/* interpolate ambient value */
714	>	setcolor(acol, 0.0, 0.0, 0.0);
715	>	d = sumambient(acol, r, nrm, rdepth,
716	>	&atrunk, thescene.cuorg, thescene.cusize);
717	>
718	>	if (d > FTINY) {
719	>	d = 1.0/d;
720	>	scalecolor(acol, d);
721	>	multcolor(aval, acol);
722	>
723	>	/* PMAP: add in caustic */
724	>	addcolor(aval, caustic);
725	>	return;
726	>	}
727	>
728	>	rdepth++;                               /* need to cache new value */
729	>	d = makeambient(acol, r, nrm, rdepth-1);
730		rdepth--;
731	+
732	+	if (d > FTINY) {
733	+	multcolor(aval, acol);          /* got new value */
734	+
735	+	/* PMAP: add in caustic */
736	+	addcolor(aval, caustic);
737	+	return;
738	+	}
739	+
740	+	dumbamb:                                        /* return global value */
741	+	if ((ambvwt <= 0) | (navsum == 0)) {
742	+	multcolor(aval, ambval);
743	+
744	+	/* PMAP: add in caustic */
745	+	addcolor(aval, caustic);
746	+	return;
747	+	}
748	+
749	+	l = bright(ambval);                     /* average in computations */
750	+	if (l > FTINY) {
751	+	d = (log(l)*(double)ambvwt + avsum) /
752	+	(double)(ambvwt + navsum);
753	+	d = exp(d) / l;
754	+	scalecolor(aval, d);
755	+	multcolor(aval, ambval);        /* apply color of ambval */
756	+	} else {
757	+	d = exp( avsum / (double)navsum );
758	+	scalecolor(aval, d);            /* neutral color */
759	+	}
760		}
761
762
763	<	double
764	<	sumambient(acol, r, at, c0, s)          /* get interpolated ambient value */
765	<	COLOR  acol;
766	<	register RAY  *r;
767	<	AMBTREE  *at;
768	<	FVECT  c0;
769	<	double  s;
763	>	static double
764	>	sumambient(     /* get interpolated ambient value */
765	>	COLOR  acol,
766	>	RAY  *r,
767	>	FVECT  rn,
768	>	int  al,
769	>	AMBTREE  *at,
770	>	FVECT  c0,
771	>	double  s
772	>	)
773		{
774	<	extern double  sqrt();
161	<	double  d, e1, e2, wt, wsum;
774	>	double  d, e1, e2, wt, wsum;
775		COLOR  ct;
776		FVECT  ck0;
777		int  i;
778	<	register int  j;
779	<	register AMBVAL  *av;
780	<	/* do this node */
778	>	int  j;
779	>	AMBVAL   *av;
780	>
781		wsum = 0.0;
782	+	/* do this node */
783		for (av = at->alist; av != NULL; av = av->next) {
784	+	double  rn_dot = -2.0;
785	+	if (tracktime)
786	+	av->latick = ambclock;
787		/*
788	<	*  Ray strength test.
788	>	*  Ambient level test.
789		*/
790	<	if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY)
791	<	continue;
790	>	if (av->lvl > al ||     /* list sorted, so this works */
791	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
792	>	break;
793		/*
794		*  Ambient radius test.
795		*/
796	<	e1 = 0.0;
797	<	for (j = 0; j < 3; j++) {
180	<	d = av->pos[j] - r->rop[j];
181	<	e1 += d * d;
182	<	}
183	<	e1 /= av->rad * av->rad;
796	>	VSUB(ck0, av->pos, r->rop);
797	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
798		if (e1 > ambacc*ambacc*1.21)
799		continue;
800		/*
801	<	*  Normal direction test.
801	>	*  Direction test using closest normal.
802		*/
803	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
804	<	if (e2 < 0.0) e2 = 0.0;
805	<	if (e1 + e2 > ambacc*ambacc*1.21)
803	>	d = DOT(av->dir, r->ron);
804	>	if (rn != r->ron) {
805	>	rn_dot = DOT(av->dir, rn);
806	>	if (rn_dot > 1.0-FTINY)
807	>	rn_dot = 1.0-FTINY;
808	>	if (rn_dot >= d-FTINY) {
809	>	d = rn_dot;
810	>	rn_dot = -2.0;
811	>	}
812	>	}
813	>	e2 = (1.0 - d) * r->rweight;
814	>	if (e2 < 0.0)
815	>	e2 = 0.0;
816	>	else if (e1 + e2 > ambacc*ambacc*1.21)
817		continue;
818		/*
819		*  Ray behind test.
#	Line 197 | Line 822 | double  s;
822		for (j = 0; j < 3; j++)
823		d += (r->rop[j] - av->pos[j]) *
824		(av->dir[j] + r->ron[j]);
825	<	if (d < -minarad)
825	>	if (d*0.5 < -minarad*ambacc-.001)
826		continue;
827		/*
828		*  Jittering final test reduces image artifacts.
829		*/
830	<	wt = sqrt(e1) + sqrt(e2);
831	<	if (wt > ambacc*(0.9 + 0.2*frandom()))
830	>	e1 = sqrt(e1);
831	>	e2 = sqrt(e2);
832	>	wt = e1 + e2;
833	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
834		continue;
835	+	/*
836	+	*  Recompute directional error using perturbed normal
837	+	*/
838	+	if (rn_dot > 0.0) {
839	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
840	+	wt = e1 + e2;
841	+	}
842		if (wt <= 1e-3)
843		wt = 1e3;
844		else
845		wt = 1.0 / wt;
846		wsum += wt;
847	<	copycolor(ct, av->val);
847	>	extambient(ct, av, r->rop, rn);
848		scalecolor(ct, wt);
849		addcolor(acol, ct);
850		}
#	Line 229 | Line 863 | double  s;
863		break;
864		}
865		if (j == 3)
866	<	wsum += sumambient(acol, r, at->kid+i, ck0, s);
866	>	wsum += sumambient(acol, r, rn, al,
867	>	at->kid+i, ck0, s);
868		}
869		return(wsum);
870		}
871
872
873	<	double
874	<	makeambient(acol, r)            /* make a new ambient value */
875	<	COLOR  acol;
876	<	register RAY  *r;
873	>	static double
874	>	makeambient(            /* make a new ambient value for storage */
875	>	COLOR  acol,
876	>	RAY  *r,
877	>	FVECT  rn,
878	>	int  al
879	>	)
880		{
881	<	AMBVAL  amb;
881	>	AMBVAL  amb;
882	>	FVECT   gp, gd;
883	>	int     i;
884
885	<	amb.rad = doambient(acol, r);           /* compute ambient */
886	<	if (amb.rad == 0.0)
885	>	amb.weight = 1.0;                       /* compute weight */
886	>	for (i = al; i-- > 0; )
887	>	amb.weight *= AVGREFL;
888	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
889	>	amb.weight = 1.25*r->rweight;
890	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
891	>	/* compute ambient */
892	>	amb.rad = doambient(acol, r, amb.weight, gp, gd);
893	>	if (amb.rad <= FTINY) {
894	>	setcolor(acol, 0.0, 0.0, 0.0);
895		return(0.0);
896	<	/* store it */
896	>	}
897	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
898	>	/* store value */
899		VCOPY(amb.pos, r->rop);
900		VCOPY(amb.dir, r->ron);
901	<	amb.lvl = r->rlvl;
252	<	amb.weight = r->rweight;
901	>	amb.lvl = al;
902		copycolor(amb.val, acol);
903	+	VCOPY(amb.gpos, gp);
904	+	VCOPY(amb.gdir, gd);
905		/* insert into tree */
906	<	avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize);
907	<	avsave(&amb);                           /* write to file */
906	>	avsave(&amb);                           /* and save to file */
907	>	if (rn != r->ron)
908	>	extambient(acol, &amb, r->rop, rn);     /* texture */
909		return(amb.rad);
910		}
911
912
913	<	double
914	<	doambient(acol, r)                      /* compute ambient component */
915	<	COLOR  acol;
916	<	register RAY  *r;
913	>	static void
914	>	extambient(             /* extrapolate value at pv, nv */
915	>	COLOR  cr,
916	>	AMBVAL   *ap,
917	>	FVECT  pv,
918	>	FVECT  nv
919	>	)
920		{
921	<	extern int  ambcmp();
922	<	extern double  sin(), cos(), sqrt();
923	<	double  phi, xd, yd, zd;
269	<	register AMBSAMP  *div;
270	<	AMBSAMP  dnew;
271	<	RAY  ar;
272	<	FVECT  ux, uy;
273	<	double  arad;
274	<	int  ndivs, nt, np, ns, ne, i, j;
275	<	register int  k;
921	>	FVECT  v1;
922	>	int  i;
923	>	double  d;
924
925	<	setcolor(acol, 0.0, 0.0, 0.0);
926	<	/* set number of divisions */
927	<	nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5;
928	<	np = 2 * nt;
929	<	ndivs = nt * np;
930	<	/* check first */
931	<	if (ndivs == 0 || rayorigin(&ar, r, AMBIENT, 0.5) < 0)
932	<	return(0.0);
933	<	/* set number of super-samples */
934	<	ns = ambssamp * r->rweight + 0.5;
287	<	if (ns > 0) {
288	<	div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP));
289	<	if (div == NULL)
290	<	error(SYSTEM, "out of memory in doambient");
925	>	d = 1.0;                        /* zeroeth order */
926	>	/* gradient due to translation */
927	>	for (i = 0; i < 3; i++)
928	>	d += ap->gpos[i]*(pv[i]-ap->pos[i]);
929	>	/* gradient due to rotation */
930	>	VCROSS(v1, ap->dir, nv);
931	>	d += DOT(ap->gdir, v1);
932	>	if (d <= 0.0) {
933	>	setcolor(cr, 0.0, 0.0, 0.0);
934	>	return;
935		}
936	<	/* make axes */
937	<	uy[0] = uy[1] = uy[2] = 0.0;
938	<	for (k = 0; k < 3; k++)
939	<	if (r->ron[k] < 0.6 && r->ron[k] > -0.6)
936	>	copycolor(cr, ap->val);
937	>	scalecolor(cr, d);
938	>	}
939	>
940	>
941	>	static void
942	>	avinsert(                               /* insert ambient value in our tree */
943	>	AMBVAL *av
944	>	)
945	>	{
946	>	AMBTREE  *at;
947	>	AMBVAL  *ap;
948	>	AMBVAL  avh;
949	>	FVECT  ck0;
950	>	double  s;
951	>	int  branch;
952	>	int  i;
953	>
954	>	if (av->rad <= FTINY)
955	>	error(CONSISTENCY, "zero ambient radius in avinsert");
956	>	at = &atrunk;
957	>	VCOPY(ck0, thescene.cuorg);
958	>	s = thescene.cusize;
959	>	while (s*(OCTSCALE/2) > av->rad*ambacc) {
960	>	if (at->kid == NULL)
961	>	if ((at->kid = newambtree()) == NULL)
962	>	error(SYSTEM, "out of memory in avinsert");
963	>	s *= 0.5;
964	>	branch = 0;
965	>	for (i = 0; i < 3; i++)
966	>	if (av->pos[i] > ck0[i] + s) {
967	>	ck0[i] += s;
968	>	branch |= 1 << i;
969	>	}
970	>	at = at->kid + branch;
971	>	}
972	>	avh.next = at->alist;           /* order by increasing level */
973	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
974	>	if ( ap->next->lvl > av->lvl ||
975	>	(ap->next->lvl == av->lvl) &
976	>	(ap->next->weight <= av->weight) )
977		break;
978	<	uy[k] = 1.0;
979	<	fcross(ux, r->ron, uy);
980	<	normalize(ux);
981	<	fcross(uy, ux, r->ron);
982	<	/* sample divisions */
983	<	arad = 0.0;
984	<	ne = 0;
985	<	for (i = 0; i < nt; i++)
986	<	for (j = 0; j < np; j++) {
987	<	rayorigin(&ar, r, AMBIENT, 0.5);        /* pretested */
988	<	zd = sqrt((i+frandom())/nt);
989	<	phi = 2.0*PI * (j+frandom())/np;
990	<	xd = cos(phi) * zd;
991	<	yd = sin(phi) * zd;
992	<	zd = sqrt(1.0 - zd*zd);
993	<	for (k = 0; k < 3; k++)
994	<	ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k];
995	<	rayvalue(&ar);
996	<	if (ar.rot < FHUGE)
997	<	arad += 1.0 / ar.rot;
998	<	if (ns > 0) {                   /* save division */
999	<	div[ne].k = 0.0;
1000	<	copycolor(div[ne].v, ar.rcol);
1001	<	div[ne].n = 0;
1002	<	div[ne].t = i; div[ne].p = j;
1003	<	/* sum errors */
1004	<	xd = bright(ar.rcol);
1005	<	if (i > 0) {            /* from above */
1006	<	yd = bright(div[ne-np].v) - xd;
1007	<	yd *= yd * 0.25;
1008	<	div[ne].k += yd;
1009	<	div[ne].n++;
1010	<	div[ne-np].k += yd;
1011	<	div[ne-np].n++;
1012	<	}
1013	<	if (j > 0) {            /* from behind */
1014	<	yd = bright(div[ne-1].v) - xd;
1015	<	yd *= yd * 0.25;
1016	<	div[ne].k += yd;
1017	<	div[ne].n++;
1018	<	div[ne-1].k += yd;
1019	<	div[ne-1].n++;
1020	<	}
1021	<	if (j == np-1) {        /* around */
1022	<	yd = bright(div[ne-(np-1)].v) - xd;
1023	<	yd *= yd * 0.25;
1024	<	div[ne].k += yd;
1025	<	div[ne].n++;
1026	<	div[ne-(np-1)].k += yd;
1027	<	div[ne-(np-1)].n++;
1028	<	}
1029	<	ne++;
1030	<	} else
1031	<	addcolor(acol, ar.rcol);
1032	<	}
1033	<	for (k = 0; k < ne; k++) {              /* compute errors */
1034	<	if (div[k].n > 1)
1035	<	div[k].k /= div[k].n;
1036	<	div[k].n = 1;
978	>	av->next = ap->next;
979	>	ap->next = (AMBVAL*)av;
980	>	at->alist = avh.next;
981	>	}
982	>
983	>	#endif  /* ! NEWAMB */
984	>
985	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
986	>
987	>	static void
988	>	initambfile(            /* initialize ambient file */
989	>	int  cre8
990	>	)
991	>	{
992	>	extern char  *progname, *octname;
993	>	static char  *mybuf = NULL;
994	>
995	>	#ifdef  F_SETLKW
996	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
997	>	#endif
998	>	SET_FILE_BINARY(ambfp);
999	>	if (mybuf == NULL)
1000	>	mybuf = (char *)bmalloc(BUFSIZ+8);
1001	>	setbuf(ambfp, mybuf);
1002	>	if (cre8) {                     /* new file */
1003	>	newheader("RADIANCE", ambfp);
1004	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
1005	>	progname, colval(ambval,RED),
1006	>	colval(ambval,GRN), colval(ambval,BLU),
1007	>	ambvwt, ambounce, ambacc);
1008	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
1009	>	ambdiv, ambssamp, ambres);
1010	>	if (octname != NULL)
1011	>	fputs(octname, ambfp);
1012	>	fputc('\n', ambfp);
1013	>	fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1014	>	fputnow(ambfp);
1015	>	fputformat(AMBFMT, ambfp);
1016	>	fputc('\n', ambfp);
1017	>	putambmagic(ambfp);
1018	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
1019	>	error(USER, "bad ambient file");
1020	>	}
1021	>
1022	>
1023	>	static void
1024	>	avsave(                         /* insert and save an ambient value */
1025	>	AMBVAL  *av
1026	>	)
1027	>	{
1028	>	avstore(av);
1029	>	if (ambfp == NULL)
1030	>	return;
1031	>	if (writambval(av, ambfp) < 0)
1032	>	goto writerr;
1033	>	if (++nunflshed >= AMBFLUSH)
1034	>	if (ambsync() == EOF)
1035	>	goto writerr;
1036	>	return;
1037	>	writerr:
1038	>	error(SYSTEM, "error writing to ambient file");
1039	>	}
1040	>
1041	>
1042	>	static AMBVAL *
1043	>	avstore(                                /* allocate memory and save aval */
1044	>	AMBVAL  *aval
1045	>	)
1046	>	{
1047	>	AMBVAL  *av;
1048	>	double  d;
1049	>
1050	>	if ((av = newambval()) == NULL)
1051	>	error(SYSTEM, "out of memory in avstore");
1052	>	*av = *aval;
1053	>	av->latick = ambclock;
1054	>	av->next = NULL;
1055	>	nambvals++;
1056	>	d = bright(av->val);
1057	>	if (d > FTINY) {                /* add to log sum for averaging */
1058	>	avsum += log(d);
1059	>	navsum++;
1060		}
1061	<	/* sort the divisions */
1062	<	qsort(div, ne, sizeof(AMBSAMP), ambcmp);
1063	<	/* skim excess */
1064	<	while (ne > ns) {
1065	<	ne--;
1066	<	addcolor(acol, div[ne].v);
1061	>	avinsert(av);                   /* insert in our cache tree */
1062	>	return(av);
1063	>	}
1064	>
1065	>
1066	>	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
1067	>
1068	>	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
1069	>
1070	>
1071	>	static AMBTREE *
1072	>	newambtree(void)                                /* allocate 8 ambient tree structs */
1073	>	{
1074	>	AMBTREE  *atp, *upperlim;
1075	>
1076	>	if (atfreelist == NULL) {       /* get more nodes */
1077	>	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
1078	>	if (atfreelist == NULL)
1079	>	return(NULL);
1080	>	/* link new free list */
1081	>	upperlim = atfreelist + 8*(ATALLOCSZ-1);
1082	>	for (atp = atfreelist; atp < upperlim; atp += 8)
1083	>	atp->kid = atp + 8;
1084	>	atp->kid = NULL;
1085		}
1086	<	/* super-sample */
1087	<	for (i = ns; i > 0; i--) {
1088	<	rayorigin(&ar, r, AMBIENT, 0.5);        /* pretested */
1089	<	zd = sqrt((div[0].t+frandom())/nt);
1090	<	phi = 2.0*PI * (div[0].p+frandom())/np;
369	<	xd = cos(phi) * zd;
370	<	yd = sin(phi) * zd;
371	<	zd = sqrt(1.0 - zd*zd);
372	<	for (k = 0; k < 3; k++)
373	<	ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k];
374	<	rayvalue(&ar);
375	<	if (ar.rot < FHUGE)
376	<	arad += 1.0 / ar.rot;
377	<	/* recompute error */
378	<	copycolor(dnew.v, div[0].v);
379	<	addcolor(dnew.v, ar.rcol);
380	<	dnew.n = div[0].n + 1;
381	<	dnew.t = div[0].t; dnew.p = div[0].p;
382	<	yd = bright(dnew.v)/dnew.n - bright(ar.rcol);
383	<	yd = yd*yd + div[0].k*(div[0].n*div[0].n);
384	<	dnew.k = yd/(dnew.n*dnew.n);
385	<	/* reinsert */
386	<	for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++)
387	<	bcopy(&div[k+1], &div[k], sizeof(AMBSAMP));
388	<	bcopy(&dnew, &div[k], sizeof(AMBSAMP));
1086	>	atp = atfreelist;
1087	>	atfreelist = atp->kid;
1088	>	memset(atp, 0, 8*sizeof(AMBTREE));
1089	>	return(atp);
1090	>	}
1091
1092	<	if (ne >= i) {          /* extract darkest division */
1093	<	ne--;
1094	<	if (div[ne].n > 1)
1095	<	scalecolor(div[ne].v, 1.0/div[ne].n);
1096	<	addcolor(acol, div[ne].v);
1097	<	}
1092	>
1093	>	static void
1094	>	freeambtree(                    /* free 8 ambient tree structs */
1095	>	AMBTREE  *atp
1096	>	)
1097	>	{
1098	>	atp->kid = atfreelist;
1099	>	atfreelist = atp;
1100	>	}
1101	>
1102	>
1103	>	static void
1104	>	unloadatree(                    /* unload an ambient value tree */
1105	>	AMBTREE  *at,
1106	>	unloadtf_t *f
1107	>	)
1108	>	{
1109	>	AMBVAL  *av;
1110	>	int  i;
1111	>	/* transfer values at this node */
1112	>	for (av = at->alist; av != NULL; av = at->alist) {
1113	>	at->alist = av->next;
1114	>	av->next = NULL;
1115	>	(*f)(av);
1116		}
1117	<	scalecolor(acol, 1.0/ndivs);
1118	<	if (arad <= FTINY)
1119	<	arad = FHUGE;
1120	<	else
1121	<	arad = (ndivs+ns) / arad / sqrt(r->rweight);
1122	<	if (arad > maxarad)
403	<	arad = maxarad;
404	<	else if (arad < minarad)
405	<	arad = minarad;
406	<	if (ns > 0)
407	<	free((char *)div);
408	<	return(arad);
1117	>	if (at->kid == NULL)
1118	>	return;
1119	>	for (i = 0; i < 8; i++)         /* transfer and free children */
1120	>	unloadatree(at->kid+i, f);
1121	>	freeambtree(at->kid);
1122	>	at->kid = NULL;
1123		}
1124
1125
1126	+	static struct avl {
1127	+	AMBVAL  *p;
1128	+	unsigned long   t;
1129	+	}       *avlist1;                       /* ambient value list with ticks */
1130	+	static AMBVAL   **avlist2;              /* memory positions for sorting */
1131	+	static int      i_avlist;               /* index for lists */
1132	+
1133	+	static int alatcmp(const void *av1, const void *av2);
1134	+
1135	+	static void
1136	+	avfree(AMBVAL *av)
1137	+	{
1138	+	free(av);
1139	+	}
1140	+
1141	+	static void
1142	+	av2list(
1143	+	AMBVAL *av
1144	+	)
1145	+	{
1146	+	#ifdef DEBUG
1147	+	if (i_avlist >= nambvals)
1148	+	error(CONSISTENCY, "too many ambient values in av2list1");
1149	+	#endif
1150	+	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1151	+	avlist1[i_avlist++].t = av->latick;
1152	+	}
1153	+
1154	+
1155		static int
1156	<	ambcmp(d1, d2)                          /* decreasing order */
1157	<	AMBSAMP  *d1, *d2;
1156	>	alatcmp(                        /* compare ambient values for MRA */
1157	>	const void *av1,
1158	>	const void *av2
1159	>	)
1160		{
1161	<	if (d1->k < d2->k)
1162	<	return(1);
1163	<	if (d1->k > d2->k)
1161	>	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1162	>	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1163	>	}
1164	>
1165	>
1166	>	/* GW NOTE 2002/10/3:
1167	>	* I used to compare AMBVAL pointers, but found that this was the
1168	>	* cause of a serious consistency error with gcc, since the optimizer
1169	>	* uses some dangerous trick in pointer subtraction that
1170	>	* assumes pointers differ by exact struct size increments.
1171	>	*/
1172	>	static int
1173	>	aposcmp(                        /* compare ambient value positions */
1174	>	const void      *avp1,
1175	>	const void      *avp2
1176	>	)
1177	>	{
1178	>	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1179	>	if (diff < 0)
1180		return(-1);
1181	<	return(0);
1181	>	return(diff > 0);
1182		}
1183
1184
1185	<	static
1186	<	avsave(av)                              /* save an ambient value */
1187	<	AMBVAL  *av;
1185	>	static int
1186	>	avlmemi(                                /* find list position from address */
1187	>	AMBVAL  *avaddr
1188	>	)
1189		{
1190	<	#ifdef  AMBFLUSH
1191	<	static int  nunflshed = 0;
1192	<	#endif
1193	<	if (ambfp == NULL)
1190	>	AMBVAL  **avlpp;
1191	>
1192	>	avlpp = (AMBVAL **)bsearch(&avaddr, avlist2,
1193	>	nambvals, sizeof(AMBVAL *), aposcmp);
1194	>	if (avlpp == NULL)
1195	>	error(CONSISTENCY, "address not found in avlmemi");
1196	>	return(avlpp - avlist2);
1197	>	}
1198	>
1199	>
1200	>	static void
1201	>	sortambvals(                    /* resort ambient values */
1202	>	int     always
1203	>	)
1204	>	{
1205	>	AMBTREE  oldatrunk;
1206	>	AMBVAL  tav, *tap, *pnext;
1207	>	int     i, j;
1208	>	/* see if it's time yet */
1209	>	if (!always && (ambclock++ < lastsort+sortintvl ||
1210	>	nambvals < SORT_THRESH))
1211		return;
1212	<	if (fwrite(av, sizeof(AMBVAL), 1, ambfp) != 1)
1213	<	goto writerr;
1214	<	#ifdef  AMBFLUSH
1215	<	if (++nunflshed >= AMBFLUSH) {
1216	<	if (fflush(ambfp) == EOF)
1217	<	goto writerr;
1218	<	nunflshed = 0;
1212	>	/*
1213	>	* The idea here is to minimize memory thrashing
1214	>	* in VM systems by improving reference locality.
1215	>	* We do this by periodically sorting our stored ambient
1216	>	* values in memory in order of most recently to least
1217	>	* recently accessed.  This ordering was chosen so that new
1218	>	* ambient values (which tend to be less important) go into
1219	>	* higher memory with the infrequently accessed values.
1220	>	*      Since we expect our values to need sorting less
1221	>	* frequently as the process continues, we double our
1222	>	* waiting interval after each call.
1223	>	*      This routine is also called by setambacc() with
1224	>	* the "always" parameter set to 1 so that the ambient
1225	>	* tree will be rebuilt with the new accuracy parameter.
1226	>	*/
1227	>	if (tracktime) {                /* allocate pointer arrays to sort */
1228	>	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1229	>	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1230	>	} else {
1231	>	avlist2 = NULL;
1232	>	avlist1 = NULL;
1233		}
1234	+	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1235	+	if (avlist2 != NULL)
1236	+	free(avlist2);
1237	+	if (always) {           /* rebuild without sorting */
1238	+	oldatrunk = atrunk;
1239	+	atrunk.alist = NULL;
1240	+	atrunk.kid = NULL;
1241	+	unloadatree(&oldatrunk, avinsert);
1242	+	}
1243	+	} else {                        /* sort memory by last access time */
1244	+	/*
1245	+	* Sorting memory is tricky because it isn't contiguous.
1246	+	* We have to sort an array of pointers by MRA and also
1247	+	* by memory position.  We then copy values in "loops"
1248	+	* to minimize memory hits.  Nevertheless, we will visit
1249	+	* everyone at least twice, and this is an expensive process
1250	+	* when we're thrashing, which is when we need to do it.
1251	+	*/
1252	+	#ifdef DEBUG
1253	+	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1254	+	nambvals, ambclock);
1255	+	eputs(errmsg);
1256		#endif
1257	<	return;
1258	<	writerr:
1259	<	error(SYSTEM, "error writing ambient file");
1257	>	i_avlist = 0;
1258	>	unloadatree(&atrunk, av2list);  /* empty current tree */
1259	>	#ifdef DEBUG
1260	>	if (i_avlist < nambvals)
1261	>	error(CONSISTENCY, "missing ambient values in sortambvals");
1262	>	#endif
1263	>	qsort(avlist1, nambvals, sizeof(struct avl), alatcmp);
1264	>	qsort(avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1265	>	for (i = 0; i < nambvals; i++) {
1266	>	if (avlist1[i].p == NULL)
1267	>	continue;
1268	>	tap = avlist2[i];
1269	>	tav = *tap;
1270	>	for (j = i; (pnext = avlist1[j].p) != tap;
1271	>	j = avlmemi(pnext)) {
1272	>	*(avlist2[j]) = *pnext;
1273	>	avinsert(avlist2[j]);
1274	>	avlist1[j].p = NULL;
1275	>	}
1276	>	*(avlist2[j]) = tav;
1277	>	avinsert(avlist2[j]);
1278	>	avlist1[j].p = NULL;
1279	>	}
1280	>	free(avlist1);
1281	>	free(avlist2);
1282	>	/* compute new sort interval */
1283	>	sortintvl = ambclock - lastsort;
1284	>	if (sortintvl >= MAX_SORT_INTVL/2)
1285	>	sortintvl = MAX_SORT_INTVL;
1286	>	else
1287	>	sortintvl <<= 1;        /* wait twice as long next */
1288	>	#ifdef DEBUG
1289	>	eputs("done\n");
1290	>	#endif
1291	>	}
1292	>	if (ambclock >= MAXACLOCK)
1293	>	ambclock = MAXACLOCK/2;
1294	>	lastsort = ambclock;
1295		}
1296
1297
1298	<	static
1299	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
1300	<	AMBVAL  *aval;
1301	<	register AMBTREE  *at;
1302	<	FVECT  c0;
1303	<	double  s;
1298	>	#ifdef  F_SETLKW
1299	>
1300	>	static void
1301	>	aflock(                 /* lock/unlock ambient file */
1302	>	int  typ
1303	>	)
1304		{
1305	<	FVECT  ck0;
456	<	int  branch;
457	<	register AMBVAL  *av;
458	<	register int  i;
1305	>	static struct flock  fls;       /* static so initialized to zeroes */
1306
1307	<	if ((av = newambval()) == NULL)
1308	<	goto memerr;
1309	<	bcopy(aval, av, sizeof(AMBVAL));
1310	<	VCOPY(ck0, c0);
1311	<	while (s*(OCTSCALE/2) > av->rad*ambacc) {
1312	<	if (at->kid == NULL)
1313	<	if ((at->kid = newambtree()) == NULL)
1314	<	goto memerr;
1315	<	s *= 0.5;
1316	<	branch = 0;
1317	<	for (i = 0; i < 3; i++)
1318	<	if (av->pos[i] > ck0[i] + s) {
1319	<	ck0[i] += s;
1320	<	branch |= 1 << i;
1307	>	if (typ == fls.l_type)          /* already called? */
1308	>	return;
1309	>	fls.l_type = typ;
1310	>	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1311	>	error(SYSTEM, "cannot (un)lock ambient file");
1312	>	}
1313	>
1314	>
1315	>	int
1316	>	ambsync(void)                   /* synchronize ambient file */
1317	>	{
1318	>	long  flen;
1319	>	AMBVAL  avs;
1320	>	int  n;
1321	>
1322	>	if (ambfp == NULL)      /* no ambient file? */
1323	>	return(0);
1324	>	/* gain appropriate access */
1325	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1326	>	/* see if file has grown */
1327	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1328	>	goto seekerr;
1329	>	if ((n = flen - lastpos) > 0) {         /* file has grown */
1330	>	if (ambinp == NULL) {           /* get new file pointer */
1331	>	ambinp = fopen(ambfile, "rb");
1332	>	if (ambinp == NULL)
1333	>	error(SYSTEM, "fopen failed in ambsync");
1334	>	}
1335	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1336	>	goto seekerr;
1337	>	while (n >= AMBVALSIZ) {        /* load contributed values */
1338	>	if (!readambval(&avs, ambinp)) {
1339	>	sprintf(errmsg,
1340	>	"ambient file \"%s\" corrupted near character %ld",
1341	>	ambfile, flen - n);
1342	>	error(WARNING, errmsg);
1343	>	break;
1344		}
1345	<	at = at->kid + branch;
1345	>	avstore(&avs);
1346	>	n -= AMBVALSIZ;
1347	>	}
1348	>	lastpos = flen - n;             /* check alignment */
1349	>	if (n && lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1350	>	goto seekerr;
1351		}
1352	<	av->next = at->alist;
1353	<	at->alist = av;
1354	<	return;
1355	<	memerr:
1356	<	error(SYSTEM, "out of memory in avinsert");
1352	>	n = fflush(ambfp);                      /* calls write() at last */
1353	>	lastpos += (long)nunflshed*AMBVALSIZ;
1354	>	aflock(F_UNLCK);                        /* release file */
1355	>	nunflshed = 0;
1356	>	return(n);
1357	>	seekerr:
1358	>	error(SYSTEM, "seek failed in ambsync");
1359	>	return(EOF);    /* pro forma return */
1360		}
1361	+
1362	+	#else   /* ! F_SETLKW */
1363	+
1364	+	int
1365	+	ambsync(void)                   /* flush ambient file */
1366	+	{
1367	+	if (ambfp == NULL)
1368	+	return(0);
1369	+	nunflshed = 0;
1370	+	return(fflush(ambfp));
1371	+	}
1372	+
1373	+	#endif  /* ! F_SETLKW */

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