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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 2.101 by schorsch, Sun Mar 6 01:13:17 2016 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	>	#define  freeav(av)     free((void *)av);
80
81	<	double  sumambient(), doambient(), makeambient();
81	>	static void initambfile(int creat);
82	>	static void avsave(AMBVAL *av);
83	>	static AMBVAL *avstore(AMBVAL  *aval);
84	>	static AMBTREE *newambtree(void);
85	>	static void freeambtree(AMBTREE  *atp);
86
87	+	typedef void unloadtf_t(AMBVAL *);
88	+	static unloadtf_t avinsert;
89	+	static unloadtf_t av2list;
90	+	static unloadtf_t avfree;
91	+	static void unloadatree(AMBTREE  *at, unloadtf_t *f);
92
93	<	setambient(afile)                       /* initialize calculation */
94	<	char  *afile;
93	>	static int aposcmp(const void *avp1, const void *avp2);
94	>	static int avlmemi(AMBVAL *avaddr);
95	>	static void sortambvals(int always);
96	>
97	>	#ifdef  F_SETLKW
98	>	static void aflock(int  typ);
99	>	#endif
100	>
101	>
102	>	void
103	>	setambres(                              /* set ambient resolution */
104	>	int  ar
105	>	)
106		{
107	<	long  ftell();
108	<	char  **amblp;
109	<	OBJECT  obj;
110	<	AMBVAL  amb;
111	<	/* set up ambient set */
112	<	ambset[0] = 0;
113	<	for (amblp = amblist; *amblp != NULL; amblp++) {
114	<	if ((obj = modifier(*amblp)) == OVOID) {
115	<	sprintf(errmsg, "unknown %s modifier \"%s\"",
116	<	ambincl ? "include" : "exclude", *amblp);
107	>	ambres = ar < 0 ? 0 : ar;               /* may be done already */
108	>	/* set min & max radii */
109	>	if (ar <= 0) {
110	>	minarad = 0;
111	>	maxarad = thescene.cusize*0.2;
112	>	} else {
113	>	minarad = thescene.cusize / ar;
114	>	maxarad = 64.0 * minarad;               /* heuristic */
115	>	if (maxarad > thescene.cusize*0.2)
116	>	maxarad = thescene.cusize*0.2;
117	>	}
118	>	if (minarad <= FTINY)
119	>	minarad = 10.0*FTINY;
120	>	if (maxarad <= minarad)
121	>	maxarad = 64.0 * minarad;
122	>	}
123	>
124	>
125	>	void
126	>	setambacc(                              /* set ambient accuracy */
127	>	double  newa
128	>	)
129	>	{
130	>	static double   olda;           /* remember previous setting here */
131	>
132	>	newa *= (newa > 0);
133	>	if (fabs(newa - olda) >= .05*(newa + olda)) {
134	>	ambacc = newa;
135	>	if (nambvals > 0)
136	>	sortambvals(1);         /* rebuild tree */
137	>	}
138	>	}
139	>
140	>
141	>	void
142	>	setambient(void)                                /* initialize calculation */
143	>	{
144	>	int     readonly = 0;
145	>	long    flen;
146	>	AMBVAL  amb;
147	>	/* make sure we're fresh */
148	>	ambdone();
149	>	/* init ambient limits */
150	>	setambres(ambres);
151	>	setambacc(ambacc);
152	>	if (ambfile == NULL || !ambfile[0])
153	>	return;
154	>	if (ambacc <= FTINY) {
155	>	sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
156	>	ambfile);
157	>	error(WARNING, errmsg);
158	>	return;
159	>	}
160	>	/* open ambient file */
161	>	if ((ambfp = fopen(ambfile, "r+")) == NULL)
162	>	readonly = (ambfp = fopen(ambfile, "r")) != NULL;
163	>	if (ambfp != NULL) {
164	>	initambfile(0);                 /* file exists */
165	>	lastpos = ftell(ambfp);
166	>	while (readambval(&amb, ambfp))
167	>	avstore(&amb);
168	>	nambshare = nambvals;           /* share loaded values */
169	>	if (readonly) {
170	>	sprintf(errmsg,
171	>	"loaded %u values from read-only ambient file",
172	>	nambvals);
173		error(WARNING, errmsg);
174	<	continue;
174	>	fclose(ambfp);          /* close file so no writes */
175	>	ambfp = NULL;
176	>	return;                 /* avoid ambsync() */
177		}
178	<	if (!inset(ambset, obj))
179	<	insertelem(ambset, obj);
178	>	/* align file pointer */
179	>	lastpos += (long)nambvals*AMBVALSIZ;
180	>	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
181	>	if (flen != lastpos) {
182	>	sprintf(errmsg,
183	>	"ignoring last %ld values in ambient file (corrupted)",
184	>	(flen - lastpos)/AMBVALSIZ);
185	>	error(WARNING, errmsg);
186	>	fseek(ambfp, lastpos, SEEK_SET);
187	>	ftruncate(fileno(ambfp), (off_t)lastpos);
188	>	}
189	>	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
190	>	initambfile(1);                 /* else create new file */
191	>	fflush(ambfp);
192	>	lastpos = ftell(ambfp);
193	>	} else {
194	>	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
195	>	error(SYSTEM, errmsg);
196		}
197	<	maxarad = thescene.cusize / 2.0;                /* maximum radius */
198	<	/* minimum radius */
199	<	minarad = ambres > 0 ? thescene.cusize/ambres : 0.0;
197	>	#ifdef  F_SETLKW
198	>	aflock(F_UNLCK);                        /* release file */
199	>	#endif
200	>	}
201
202	<	/* open ambient file */
203	<	if (afile != NULL)
204	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
205	<	while (fread(&amb, sizeof(AMBVAL), 1, ambfp) == 1)
206	<	avinsert(&amb, &atrunk, thescene.cuorg,
207	<	thescene.cusize);
208	<	/* align */
209	<	fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1);
210	<	} else if ((ambfp = fopen(afile, "w")) == NULL) {
211	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
212	<	afile);
107	<	error(SYSTEM, errmsg);
202	>
203	>	void
204	>	ambdone(void)                   /* close ambient file and free memory */
205	>	{
206	>	if (ambfp != NULL) {            /* close ambient file */
207	>	ambsync();
208	>	fclose(ambfp);
209	>	ambfp = NULL;
210	>	if (ambinp != NULL) {
211	>	fclose(ambinp);
212	>	ambinp = NULL;
213		}
214	+	lastpos = -1;
215	+	}
216	+	/* free ambient tree */
217	+	unloadatree(&atrunk, avfree);
218	+	/* reset state variables */
219	+	avsum = 0.;
220	+	navsum = 0;
221	+	nambvals = 0;
222	+	nambshare = 0;
223	+	ambclock = 0;
224	+	lastsort = 0;
225	+	sortintvl = SORT_INTVL;
226		}
227
228
229	<	ambient(acol, r)                /* compute ambient component for ray */
230	<	COLOR  acol;
231	<	register RAY  *r;
229	>	void
230	>	ambnotify(                      /* record new modifier */
231	>	OBJECT  obj
232	>	)
233		{
234	+	static int  hitlimit = 0;
235	+	OBJREC   *o;
236	+	char  **amblp;
237	+
238	+	if (obj == OVOID) {             /* starting over */
239	+	ambset[0] = 0;
240	+	hitlimit = 0;
241	+	return;
242	+	}
243	+	o = objptr(obj);
244	+	if (hitlimit || !ismodifier(o->otype))
245	+	return;
246	+	for (amblp = amblist; *amblp != NULL; amblp++)
247	+	if (!strcmp(o->oname, *amblp)) {
248	+	if (ambset[0] >= MAXASET) {
249	+	error(WARNING, "too many modifiers in ambient list");
250	+	hitlimit++;
251	+	return;         /* should this be fatal? */
252	+	}
253	+	insertelem(ambset, obj);
254	+	return;
255	+	}
256	+	}
257	+
258	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
259	+
260	+	#ifndef OLDAMB
261	+
262	+	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
263	+
264	+	static int      plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang);
265	+	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
266	+	AMBTREE *at, FVECT c0, double s);
267	+	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
268	+	static int      extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
269	+	FVECT uvw[3]);
270	+
271	+	void
272	+	multambient(            /* compute ambient component & multiply by coef. */
273	+	COLOR  aval,
274	+	RAY  *r,
275	+	FVECT  nrm
276	+	)
277	+	{
278		static int  rdepth = 0;                 /* ambient recursion */
279	<	double  wsum;
279	>	COLOR   acol, caustic;
280	>	int     ok;
281	>	double  d, l;
282
283	<	rdepth++;                               /* increment level */
283	>	/* PMAP: Factor in ambient from photon map, if enabled and ray is
284	>	* ambient. Return as all ambient components accounted for, else
285	>	* continue. */
286	>	if (ambPmap(aval, r, rdepth))
287	>	return;
288
289	+	/* PMAP: Factor in specular-diffuse ambient (caustics) from photon
290	+	* map, if enabled and ray is primary, else caustic is zero.  Continue
291	+	* with RADIANCE ambient calculation */
292	+	copycolor(caustic, aval);
293	+	ambPmapCaustic(caustic, r, rdepth);
294	+
295		if (ambdiv <= 0)                        /* no ambient calculation */
296		goto dumbamb;
297		/* check number of bounces */
298	<	if (rdepth > ambounce)
298	>	if (rdepth >= ambounce)
299		goto dumbamb;
300		/* check ambient list */
301		if (ambincl != -1 && r->ro != NULL &&
#	Line 129 | Line 303 | register RAY  *r;
303		goto dumbamb;
304
305		if (ambacc <= FTINY) {                  /* no ambient storage */
306	<	if (doambient(acol, r) == 0.0)
306	>	copycolor(acol, aval);
307	>	rdepth++;
308	>	ok = doambient(acol, r, r->rweight,
309	>	NULL, NULL, NULL, NULL, NULL);
310	>	rdepth--;
311	>	if (!ok)
312		goto dumbamb;
313	<	goto done;
313	>	copycolor(aval, acol);
314	>
315	>	/* PMAP: add in caustic */
316	>	addcolor(aval, caustic);
317	>	return;
318		}
319	<	/* get ambient value */
319	>
320	>	if (tracktime)                          /* sort to minimize thrashing */
321	>	sortambvals(0);
322	>	/* interpolate ambient value */
323		setcolor(acol, 0.0, 0.0, 0.0);
324	<	wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize);
325	<	if (wsum > FTINY)
326	<	scalecolor(acol, 1.0/wsum);
327	<	else if (makeambient(acol, r) == 0.0)
328	<	goto dumbamb;
329	<	goto done;
324	>	d = sumambient(acol, r, nrm, rdepth,
325	>	&atrunk, thescene.cuorg, thescene.cusize);
326	>
327	>	if (d > FTINY) {
328	>	d = 1.0/d;
329	>	scalecolor(acol, d);
330	>	multcolor(aval, acol);
331
332	+	/* PMAP: add in caustic */
333	+	addcolor(aval, caustic);
334	+	return;
335	+	}
336	+
337	+	rdepth++;                               /* need to cache new value */
338	+	ok = makeambient(acol, r, nrm, rdepth-1);
339	+	rdepth--;
340	+
341	+	if (ok) {
342	+	multcolor(aval, acol);          /* computed new value */
343	+
344	+	/* PMAP: add in caustic */
345	+	addcolor(aval, caustic);
346	+	return;
347	+	}
348	+
349		dumbamb:                                        /* return global value */
350	<	copycolor(acol, ambval);
351	<	done:                                           /* must finish here! */
350	>	if ((ambvwt <= 0) | (navsum == 0)) {
351	>	multcolor(aval, ambval);
352	>
353	>	/* PMAP: add in caustic */
354	>	addcolor(aval, caustic);
355	>	return;
356	>	}
357	>
358	>	l = bright(ambval);                     /* average in computations */
359	>	if (l > FTINY) {
360	>	d = (log(l)*(double)ambvwt + avsum) /
361	>	(double)(ambvwt + navsum);
362	>	d = exp(d) / l;
363	>	scalecolor(aval, d);
364	>	multcolor(aval, ambval);        /* apply color of ambval */
365	>	} else {
366	>	d = exp( avsum / (double)navsum );
367	>	scalecolor(aval, d);            /* neutral color */
368	>	}
369	>	}
370	>
371	>
372	>	/* Plug a potential leak where ambient cache value is occluded */
373	>	static int
374	>	plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
375	>	{
376	>	const double    cost70sq = 0.1169778;   /* cos(70deg)^2 */
377	>	RAY             rtst;
378	>	FVECT           vdif;
379	>	double          normdot, ndotd, nadotd;
380	>	double          a, b, c, t[2];
381	>
382	>	ang += 2.*PI*(ang < 0);                 /* check direction flags */
383	>	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
384	>	return(0);
385	>	/*
386	>	* Generate test ray, targeting 20 degrees above sample point plane
387	>	* along surface normal from cache position.  This should be high
388	>	* enough to miss local geometry we don't really care about.
389	>	*/
390	>	VSUB(vdif, ap->pos, r->rop);
391	>	normdot = DOT(anorm, r->ron);
392	>	ndotd = DOT(vdif, r->ron);
393	>	nadotd = DOT(vdif, anorm);
394	>	a = normdot*normdot - cost70sq;
395	>	b = 2.0*(normdot*ndotd - nadotd*cost70sq);
396	>	c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq;
397	>	if (quadratic(t, a, b, c) != 2)
398	>	return(1);                      /* should rarely happen */
399	>	if (t[1] <= FTINY)
400	>	return(0);                      /* should fail behind test */
401	>	rayorigin(&rtst, SHADOW, r, NULL);
402	>	VSUM(rtst.rdir, vdif, anorm, t[1]);     /* further dist. > plane */
403	>	rtst.rmax = normalize(rtst.rdir);       /* short ray test */
404	>	while (localhit(&rtst, &thescene)) {    /* check for occluder */
405	>	if (rtst.ro->omod != OVOID &&
406	>	(rtst.clipset == NULL ||
407	>	!inset(rtst.clipset, rtst.ro->omod)))
408	>	return(1);              /* plug light leak */
409	>	VCOPY(rtst.rorg, rtst.rop);     /* skip invisible surface */
410	>	rtst.rmax -= rtst.rot;
411	>	rayclear(&rtst);
412	>	}
413	>	return(0);                              /* seems we're OK */
414	>	}
415	>
416	>
417	>	static double
418	>	sumambient(             /* get interpolated ambient value */
419	>	COLOR  acol,
420	>	RAY  *r,
421	>	FVECT  rn,
422	>	int  al,
423	>	AMBTREE  *at,
424	>	FVECT  c0,
425	>	double  s
426	>	)
427	>	{                       /* initial limit is 10 degrees plus ambacc radians */
428	>	const double    minangle = 10.0 * PI/180.;
429	>	double          maxangle = minangle + ambacc;
430	>	double          wsum = 0.0;
431	>	FVECT           ck0;
432	>	int             i, j;
433	>	AMBVAL          *av;
434	>
435	>	if (at->kid != NULL) {          /* sum children first */
436	>	s *= 0.5;
437	>	for (i = 0; i < 8; i++) {
438	>	for (j = 0; j < 3; j++) {
439	>	ck0[j] = c0[j];
440	>	if (1<<j & i)
441	>	ck0[j] += s;
442	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
443	>	break;
444	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
445	>	break;
446	>	}
447	>	if (j == 3)
448	>	wsum += sumambient(acol, r, rn, al,
449	>	at->kid+i, ck0, s);
450	>	}
451	>	/* good enough? */
452	>	if (wsum >= 0.05 && s > minarad*10.0)
453	>	return(wsum);
454	>	}
455	>	/* adjust maximum angle */
456	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
457	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
458	>	/* sum this node */
459	>	for (av = at->alist; av != NULL; av = av->next) {
460	>	double  u, v, d, delta_r2, delta_t2;
461	>	COLOR   ct;
462	>	FVECT   uvw[3];
463	>	/* record access */
464	>	if (tracktime)
465	>	av->latick = ambclock;
466	>	/*
467	>	*  Ambient level test
468	>	*/
469	>	if (av->lvl > al ||     /* list sorted, so this works */
470	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
471	>	break;
472	>	/*
473	>	*  Direction test using unperturbed normal
474	>	*/
475	>	decodedir(uvw[2], av->ndir);
476	>	d = DOT(uvw[2], r->ron);
477	>	if (d <= 0.0)           /* >= 90 degrees */
478	>	continue;
479	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
480	>	if (delta_r2 >= maxangle*maxangle)
481	>	continue;
482	>	/*
483	>	*  Modified ray behind test
484	>	*/
485	>	VSUB(ck0, r->rop, av->pos);
486	>	d = DOT(ck0, uvw[2]);
487	>	if (d < -minarad*ambacc-.001)
488	>	continue;
489	>	d /= av->rad[0];
490	>	delta_t2 = d*d;
491	>	if (delta_t2 >= ambacc*ambacc)
492	>	continue;
493	>	/*
494	>	*  Elliptical radii test based on Hessian
495	>	*/
496	>	decodedir(uvw[0], av->udir);
497	>	VCROSS(uvw[1], uvw[2], uvw[0]);
498	>	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
499	>	delta_t2 += d*d;
500	>	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
501	>	delta_t2 += d*d;
502	>	if (delta_t2 >= ambacc*ambacc)
503	>	continue;
504	>	/*
505	>	*  Test for potential light leak
506	>	*/
507	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
508	>	continue;
509	>	/*
510	>	*  Extrapolate value and compute final weight (hat function)
511	>	*/
512	>	if (!extambient(ct, av, r->rop, rn, uvw))
513	>	continue;
514	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
515	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
516	>	scalecolor(ct, d);
517	>	addcolor(acol, ct);
518	>	wsum += d;
519	>	}
520	>	return(wsum);
521	>	}
522	>
523	>
524	>	static int
525	>	makeambient(            /* make a new ambient value for storage */
526	>	COLOR  acol,
527	>	RAY  *r,
528	>	FVECT  rn,
529	>	int  al
530	>	)
531	>	{
532	>	AMBVAL  amb;
533	>	FVECT   uvw[3];
534	>	int     i;
535	>
536	>	amb.weight = 1.0;                       /* compute weight */
537	>	for (i = al; i-- > 0; )
538	>	amb.weight *= AVGREFL;
539	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
540	>	amb.weight = 1.25*r->rweight;
541	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
542	>	/* compute ambient */
543	>	i = doambient(acol, r, amb.weight,
544	>	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
545	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
546	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
547	>	return(i);
548	>	/* store value */
549	>	VCOPY(amb.pos, r->rop);
550	>	amb.ndir = encodedir(r->ron);
551	>	amb.udir = encodedir(uvw[0]);
552	>	amb.lvl = al;
553	>	copycolor(amb.val, acol);
554	>	/* insert into tree */
555	>	avsave(&amb);                           /* and save to file */
556	>	if (rn != r->ron) {                     /* texture */
557	>	VCOPY(uvw[2], r->ron);
558	>	extambient(acol, &amb, r->rop, rn, uvw);
559	>	}
560	>	return(1);
561	>	}
562	>
563	>
564	>	static int
565	>	extambient(             /* extrapolate value at pv, nv */
566	>	COLOR  cr,
567	>	AMBVAL   *ap,
568	>	FVECT  pv,
569	>	FVECT  nv,
570	>	FVECT  uvw[3]
571	>	)
572	>	{
573	>	const double    min_d = 0.05;
574	>	static FVECT    my_uvw[3];
575	>	FVECT           v1;
576	>	int             i;
577	>	double          d = 1.0;        /* zeroeth order */
578	>
579	>	if (uvw == NULL) {              /* need local coordinates? */
580	>	decodedir(my_uvw[2], ap->ndir);
581	>	decodedir(my_uvw[0], ap->udir);
582	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
583	>	uvw = my_uvw;
584	>	}
585	>	for (i = 3; i--; )              /* gradient due to translation */
586	>	d += (pv[i] - ap->pos[i]) *
587	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
588	>
589	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
590	>	for (i = 3; i--; )
591	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
592	>
593	>	if (d < min_d)                  /* should not use if we can avoid it */
594	>	d = min_d;
595	>	copycolor(cr, ap->val);
596	>	scalecolor(cr, d);
597	>	return(d > min_d);
598	>	}
599	>
600	>
601	>	static void
602	>	avinsert(                               /* insert ambient value in our tree */
603	>	AMBVAL *av
604	>	)
605	>	{
606	>	AMBTREE  *at;
607	>	AMBVAL  *ap;
608	>	AMBVAL  avh;
609	>	FVECT  ck0;
610	>	double  s;
611	>	int  branch;
612	>	int  i;
613	>
614	>	if (av->rad[0] <= FTINY)
615	>	error(CONSISTENCY, "zero ambient radius in avinsert");
616	>	at = &atrunk;
617	>	VCOPY(ck0, thescene.cuorg);
618	>	s = thescene.cusize;
619	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
620	>	if (at->kid == NULL)
621	>	if ((at->kid = newambtree()) == NULL)
622	>	error(SYSTEM, "out of memory in avinsert");
623	>	s *= 0.5;
624	>	branch = 0;
625	>	for (i = 0; i < 3; i++)
626	>	if (av->pos[i] > ck0[i] + s) {
627	>	ck0[i] += s;
628	>	branch |= 1 << i;
629	>	}
630	>	at = at->kid + branch;
631	>	}
632	>	avh.next = at->alist;           /* order by increasing level */
633	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
634	>	if ( ap->next->lvl > av->lvl ||
635	>	(ap->next->lvl == av->lvl) &
636	>	(ap->next->weight <= av->weight) )
637	>	break;
638	>	av->next = ap->next;
639	>	ap->next = (AMBVAL*)av;
640	>	at->alist = avh.next;
641	>	}
642	>
643	>
644	>	#else /* ! NEWAMB */
645	>
646	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
647	>	AMBTREE *at, FVECT c0, double s);
648	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
649	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
650	>
651	>
652	>	void
653	>	multambient(            /* compute ambient component & multiply by coef. */
654	>	COLOR  aval,
655	>	RAY  *r,
656	>	FVECT  nrm
657	>	)
658	>	{
659	>	static int  rdepth = 0;                 /* ambient recursion */
660	>	COLOR   acol, caustic;
661	>	double  d, l;
662	>
663	>	/* PMAP: Factor in ambient from global photon map (if enabled) and return
664	>	* as all ambient components accounted for */
665	>	if (ambPmap(aval, r, rdepth))
666	>	return;
667	>
668	>	/* PMAP: Otherwise factor in ambient from caustic photon map
669	>	* (ambPmapCaustic() returns zero if caustic photons disabled) and
670	>	* continue with RADIANCE ambient calculation */
671	>	copycolor(caustic, aval);
672	>	ambPmapCaustic(caustic, r, rdepth);
673	>
674	>	if (ambdiv <= 0)                        /* no ambient calculation */
675	>	goto dumbamb;
676	>	/* check number of bounces */
677	>	if (rdepth >= ambounce)
678	>	goto dumbamb;
679	>	/* check ambient list */
680	>	if (ambincl != -1 && r->ro != NULL &&
681	>	ambincl != inset(ambset, r->ro->omod))
682	>	goto dumbamb;
683	>
684	>	if (ambacc <= FTINY) {                  /* no ambient storage */
685	>	copycolor(acol, aval);
686	>	rdepth++;
687	>	d = doambient(acol, r, r->rweight, NULL, NULL);
688	>	rdepth--;
689	>	if (d <= FTINY)
690	>	goto dumbamb;
691	>	copycolor(aval, acol);
692	>
693	>	/* PMAP: add in caustic */
694	>	addcolor(aval, caustic);
695	>	return;
696	>	}
697	>
698	>	if (tracktime)                          /* sort to minimize thrashing */
699	>	sortambvals(0);
700	>	/* interpolate ambient value */
701	>	setcolor(acol, 0.0, 0.0, 0.0);
702	>	d = sumambient(acol, r, nrm, rdepth,
703	>	&atrunk, thescene.cuorg, thescene.cusize);
704	>
705	>	if (d > FTINY) {
706	>	d = 1.0/d;
707	>	scalecolor(acol, d);
708	>	multcolor(aval, acol);
709	>
710	>	/* PMAP: add in caustic */
711	>	addcolor(aval, caustic);
712	>	return;
713	>	}
714	>
715	>	rdepth++;                               /* need to cache new value */
716	>	d = makeambient(acol, r, nrm, rdepth-1);
717		rdepth--;
718	+
719	+	if (d > FTINY) {
720	+	multcolor(aval, acol);          /* got new value */
721	+
722	+	/* PMAP: add in caustic */
723	+	addcolor(aval, caustic);
724	+	return;
725	+	}
726	+
727	+	dumbamb:                                        /* return global value */
728	+	if ((ambvwt <= 0) | (navsum == 0)) {
729	+	multcolor(aval, ambval);
730	+
731	+	/* PMAP: add in caustic */
732	+	addcolor(aval, caustic);
733	+	return;
734	+	}
735	+
736	+	l = bright(ambval);                     /* average in computations */
737	+	if (l > FTINY) {
738	+	d = (log(l)*(double)ambvwt + avsum) /
739	+	(double)(ambvwt + navsum);
740	+	d = exp(d) / l;
741	+	scalecolor(aval, d);
742	+	multcolor(aval, ambval);        /* apply color of ambval */
743	+	} else {
744	+	d = exp( avsum / (double)navsum );
745	+	scalecolor(aval, d);            /* neutral color */
746	+	}
747		}
748
749
750	<	double
751	<	sumambient(acol, r, at, c0, s)          /* get interpolated ambient value */
752	<	COLOR  acol;
753	<	register RAY  *r;
754	<	AMBTREE  *at;
755	<	FVECT  c0;
756	<	double  s;
750	>	static double
751	>	sumambient(     /* get interpolated ambient value */
752	>	COLOR  acol,
753	>	RAY  *r,
754	>	FVECT  rn,
755	>	int  al,
756	>	AMBTREE  *at,
757	>	FVECT  c0,
758	>	double  s
759	>	)
760		{
761	<	extern double  sqrt();
161	<	double  d, e1, e2, wt, wsum;
761	>	double  d, e1, e2, wt, wsum;
762		COLOR  ct;
763		FVECT  ck0;
764		int  i;
765	<	register int  j;
766	<	register AMBVAL  *av;
767	<	/* do this node */
765	>	int  j;
766	>	AMBVAL   *av;
767	>
768		wsum = 0.0;
769	+	/* do this node */
770		for (av = at->alist; av != NULL; av = av->next) {
771	+	double  rn_dot = -2.0;
772	+	if (tracktime)
773	+	av->latick = ambclock;
774		/*
775	<	*  Ray strength test.
775	>	*  Ambient level test.
776		*/
777	<	if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY)
778	<	continue;
777	>	if (av->lvl > al ||     /* list sorted, so this works */
778	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
779	>	break;
780		/*
781		*  Ambient radius test.
782		*/
783	<	e1 = 0.0;
784	<	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;
783	>	VSUB(ck0, av->pos, r->rop);
784	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
785		if (e1 > ambacc*ambacc*1.21)
786		continue;
787		/*
788	<	*  Normal direction test.
788	>	*  Direction test using closest normal.
789		*/
790	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
791	<	if (e2 < 0.0) e2 = 0.0;
792	<	if (e1 + e2 > ambacc*ambacc*1.21)
790	>	d = DOT(av->dir, r->ron);
791	>	if (rn != r->ron) {
792	>	rn_dot = DOT(av->dir, rn);
793	>	if (rn_dot > 1.0-FTINY)
794	>	rn_dot = 1.0-FTINY;
795	>	if (rn_dot >= d-FTINY) {
796	>	d = rn_dot;
797	>	rn_dot = -2.0;
798	>	}
799	>	}
800	>	e2 = (1.0 - d) * r->rweight;
801	>	if (e2 < 0.0)
802	>	e2 = 0.0;
803	>	else if (e1 + e2 > ambacc*ambacc*1.21)
804		continue;
805		/*
806		*  Ray behind test.
#	Line 197 | Line 809 | double  s;
809		for (j = 0; j < 3; j++)
810		d += (r->rop[j] - av->pos[j]) *
811		(av->dir[j] + r->ron[j]);
812	<	if (d < -minarad)
812	>	if (d*0.5 < -minarad*ambacc-.001)
813		continue;
814		/*
815		*  Jittering final test reduces image artifacts.
816		*/
817	<	wt = sqrt(e1) + sqrt(e2);
818	<	if (wt > ambacc*(0.9 + 0.2*frandom()))
817	>	e1 = sqrt(e1);
818	>	e2 = sqrt(e2);
819	>	wt = e1 + e2;
820	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
821		continue;
822	+	/*
823	+	*  Recompute directional error using perturbed normal
824	+	*/
825	+	if (rn_dot > 0.0) {
826	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
827	+	wt = e1 + e2;
828	+	}
829		if (wt <= 1e-3)
830		wt = 1e3;
831		else
832		wt = 1.0 / wt;
833		wsum += wt;
834	<	copycolor(ct, av->val);
834	>	extambient(ct, av, r->rop, rn);
835		scalecolor(ct, wt);
836		addcolor(acol, ct);
837		}
#	Line 229 | Line 850 | double  s;
850		break;
851		}
852		if (j == 3)
853	<	wsum += sumambient(acol, r, at->kid+i, ck0, s);
853	>	wsum += sumambient(acol, r, rn, al,
854	>	at->kid+i, ck0, s);
855		}
856		return(wsum);
857		}
858
859
860	<	double
861	<	makeambient(acol, r)            /* make a new ambient value */
862	<	COLOR  acol;
863	<	register RAY  *r;
860	>	static double
861	>	makeambient(            /* make a new ambient value for storage */
862	>	COLOR  acol,
863	>	RAY  *r,
864	>	FVECT  rn,
865	>	int  al
866	>	)
867		{
868	<	AMBVAL  amb;
868	>	AMBVAL  amb;
869	>	FVECT   gp, gd;
870	>	int     i;
871
872	<	amb.rad = doambient(acol, r);           /* compute ambient */
873	<	if (amb.rad == 0.0)
872	>	amb.weight = 1.0;                       /* compute weight */
873	>	for (i = al; i-- > 0; )
874	>	amb.weight *= AVGREFL;
875	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
876	>	amb.weight = 1.25*r->rweight;
877	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
878	>	/* compute ambient */
879	>	amb.rad = doambient(acol, r, amb.weight, gp, gd);
880	>	if (amb.rad <= FTINY) {
881	>	setcolor(acol, 0.0, 0.0, 0.0);
882		return(0.0);
883	<	/* store it */
883	>	}
884	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
885	>	/* store value */
886		VCOPY(amb.pos, r->rop);
887		VCOPY(amb.dir, r->ron);
888	<	amb.lvl = r->rlvl;
252	<	amb.weight = r->rweight;
888	>	amb.lvl = al;
889		copycolor(amb.val, acol);
890	+	VCOPY(amb.gpos, gp);
891	+	VCOPY(amb.gdir, gd);
892		/* insert into tree */
893	<	avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize);
894	<	avsave(&amb);                           /* write to file */
893	>	avsave(&amb);                           /* and save to file */
894	>	if (rn != r->ron)
895	>	extambient(acol, &amb, r->rop, rn);     /* texture */
896		return(amb.rad);
897		}
898
899
900	<	double
901	<	doambient(acol, r)                      /* compute ambient component */
902	<	COLOR  acol;
903	<	register RAY  *r;
900	>	static void
901	>	extambient(             /* extrapolate value at pv, nv */
902	>	COLOR  cr,
903	>	AMBVAL   *ap,
904	>	FVECT  pv,
905	>	FVECT  nv
906	>	)
907		{
908	<	extern int  ambcmp();
909	<	extern double  sin(), cos(), sqrt();
910	<	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;
908	>	FVECT  v1;
909	>	int  i;
910	>	double  d;
911
912	<	setcolor(acol, 0.0, 0.0, 0.0);
913	<	/* set number of divisions */
914	<	nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5;
915	<	np = 2 * nt;
916	<	ndivs = nt * np;
917	<	/* check first */
918	<	if (ndivs == 0 || rayorigin(&ar, r, AMBIENT, 0.5) < 0)
919	<	return(0.0);
920	<	/* set number of super-samples */
921	<	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");
912	>	d = 1.0;                        /* zeroeth order */
913	>	/* gradient due to translation */
914	>	for (i = 0; i < 3; i++)
915	>	d += ap->gpos[i]*(pv[i]-ap->pos[i]);
916	>	/* gradient due to rotation */
917	>	VCROSS(v1, ap->dir, nv);
918	>	d += DOT(ap->gdir, v1);
919	>	if (d <= 0.0) {
920	>	setcolor(cr, 0.0, 0.0, 0.0);
921	>	return;
922		}
923	<	/* make axes */
924	<	uy[0] = uy[1] = uy[2] = 0.0;
925	<	for (k = 0; k < 3; k++)
926	<	if (r->ron[k] < 0.6 && r->ron[k] > -0.6)
923	>	copycolor(cr, ap->val);
924	>	scalecolor(cr, d);
925	>	}
926	>
927	>
928	>	static void
929	>	avinsert(                               /* insert ambient value in our tree */
930	>	AMBVAL *av
931	>	)
932	>	{
933	>	AMBTREE  *at;
934	>	AMBVAL  *ap;
935	>	AMBVAL  avh;
936	>	FVECT  ck0;
937	>	double  s;
938	>	int  branch;
939	>	int  i;
940	>
941	>	if (av->rad <= FTINY)
942	>	error(CONSISTENCY, "zero ambient radius in avinsert");
943	>	at = &atrunk;
944	>	VCOPY(ck0, thescene.cuorg);
945	>	s = thescene.cusize;
946	>	while (s*(OCTSCALE/2) > av->rad*ambacc) {
947	>	if (at->kid == NULL)
948	>	if ((at->kid = newambtree()) == NULL)
949	>	error(SYSTEM, "out of memory in avinsert");
950	>	s *= 0.5;
951	>	branch = 0;
952	>	for (i = 0; i < 3; i++)
953	>	if (av->pos[i] > ck0[i] + s) {
954	>	ck0[i] += s;
955	>	branch |= 1 << i;
956	>	}
957	>	at = at->kid + branch;
958	>	}
959	>	avh.next = at->alist;           /* order by increasing level */
960	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
961	>	if ( ap->next->lvl > av->lvl ||
962	>	(ap->next->lvl == av->lvl) &
963	>	(ap->next->weight <= av->weight) )
964		break;
965	<	uy[k] = 1.0;
966	<	fcross(ux, r->ron, uy);
967	<	normalize(ux);
968	<	fcross(uy, ux, r->ron);
969	<	/* sample divisions */
970	<	arad = 0.0;
971	<	ne = 0;
972	<	for (i = 0; i < nt; i++)
973	<	for (j = 0; j < np; j++) {
974	<	rayorigin(&ar, r, AMBIENT, 0.5);        /* pretested */
975	<	zd = sqrt((i+frandom())/nt);
976	<	phi = 2.0*PI * (j+frandom())/np;
977	<	xd = cos(phi) * zd;
978	<	yd = sin(phi) * zd;
979	<	zd = sqrt(1.0 - zd*zd);
980	<	for (k = 0; k < 3; k++)
981	<	ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k];
982	<	rayvalue(&ar);
983	<	if (ar.rot < FHUGE)
984	<	arad += 1.0 / ar.rot;
985	<	if (ns > 0) {                   /* save division */
986	<	div[ne].k = 0.0;
987	<	copycolor(div[ne].v, ar.rcol);
988	<	div[ne].n = 0;
989	<	div[ne].t = i; div[ne].p = j;
990	<	/* sum errors */
991	<	xd = bright(ar.rcol);
992	<	if (i > 0) {            /* from above */
993	<	yd = bright(div[ne-np].v) - xd;
994	<	yd *= yd * 0.25;
995	<	div[ne].k += yd;
996	<	div[ne].n++;
997	<	div[ne-np].k += yd;
998	<	div[ne-np].n++;
999	<	}
1000	<	if (j > 0) {            /* from behind */
1001	<	yd = bright(div[ne-1].v) - xd;
1002	<	yd *= yd * 0.25;
1003	<	div[ne].k += yd;
1004	<	div[ne].n++;
1005	<	div[ne-1].k += yd;
1006	<	div[ne-1].n++;
1007	<	}
1008	<	if (j == np-1) {        /* around */
1009	<	yd = bright(div[ne-(np-1)].v) - xd;
1010	<	yd *= yd * 0.25;
1011	<	div[ne].k += yd;
1012	<	div[ne].n++;
1013	<	div[ne-(np-1)].k += yd;
1014	<	div[ne-(np-1)].n++;
1015	<	}
1016	<	ne++;
1017	<	} else
1018	<	addcolor(acol, ar.rcol);
1019	<	}
1020	<	for (k = 0; k < ne; k++) {              /* compute errors */
1021	<	if (div[k].n > 1)
1022	<	div[k].k /= div[k].n;
1023	<	div[k].n = 1;
965	>	av->next = ap->next;
966	>	ap->next = (AMBVAL*)av;
967	>	at->alist = avh.next;
968	>	}
969	>
970	>	#endif  /* ! NEWAMB */
971	>
972	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
973	>
974	>	static void
975	>	initambfile(            /* initialize ambient file */
976	>	int  cre8
977	>	)
978	>	{
979	>	extern char  *progname, *octname;
980	>	static char  *mybuf = NULL;
981	>
982	>	#ifdef  F_SETLKW
983	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
984	>	#endif
985	>	SET_FILE_BINARY(ambfp);
986	>	if (mybuf == NULL)
987	>	mybuf = (char *)bmalloc(BUFSIZ+8);
988	>	setbuf(ambfp, mybuf);
989	>	if (cre8) {                     /* new file */
990	>	newheader("RADIANCE", ambfp);
991	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
992	>	progname, colval(ambval,RED),
993	>	colval(ambval,GRN), colval(ambval,BLU),
994	>	ambvwt, ambounce, ambacc);
995	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
996	>	ambdiv, ambssamp, ambres);
997	>	if (octname != NULL)
998	>	fputs(octname, ambfp);
999	>	fputc('\n', ambfp);
1000	>	fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1001	>	fputnow(ambfp);
1002	>	fputformat(AMBFMT, ambfp);
1003	>	fputc('\n', ambfp);
1004	>	putambmagic(ambfp);
1005	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
1006	>	error(USER, "bad ambient file");
1007	>	}
1008	>
1009	>
1010	>	static void
1011	>	avsave(                         /* insert and save an ambient value */
1012	>	AMBVAL  *av
1013	>	)
1014	>	{
1015	>	avstore(av);
1016	>	if (ambfp == NULL)
1017	>	return;
1018	>	if (writambval(av, ambfp) < 0)
1019	>	goto writerr;
1020	>	if (++nunflshed >= AMBFLUSH)
1021	>	if (ambsync() == EOF)
1022	>	goto writerr;
1023	>	return;
1024	>	writerr:
1025	>	error(SYSTEM, "error writing to ambient file");
1026	>	}
1027	>
1028	>
1029	>	static AMBVAL *
1030	>	avstore(                                /* allocate memory and save aval */
1031	>	AMBVAL  *aval
1032	>	)
1033	>	{
1034	>	AMBVAL  *av;
1035	>	double  d;
1036	>
1037	>	if ((av = newambval()) == NULL)
1038	>	error(SYSTEM, "out of memory in avstore");
1039	>	*av = *aval;
1040	>	av->latick = ambclock;
1041	>	av->next = NULL;
1042	>	nambvals++;
1043	>	d = bright(av->val);
1044	>	if (d > FTINY) {                /* add to log sum for averaging */
1045	>	avsum += log(d);
1046	>	navsum++;
1047		}
1048	<	/* sort the divisions */
1049	<	qsort(div, ne, sizeof(AMBSAMP), ambcmp);
1050	<	/* skim excess */
1051	<	while (ne > ns) {
1052	<	ne--;
1053	<	addcolor(acol, div[ne].v);
1048	>	avinsert(av);                   /* insert in our cache tree */
1049	>	return(av);
1050	>	}
1051	>
1052	>
1053	>	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
1054	>
1055	>	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
1056	>
1057	>
1058	>	static AMBTREE *
1059	>	newambtree(void)                                /* allocate 8 ambient tree structs */
1060	>	{
1061	>	AMBTREE  *atp, *upperlim;
1062	>
1063	>	if (atfreelist == NULL) {       /* get more nodes */
1064	>	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
1065	>	if (atfreelist == NULL)
1066	>	return(NULL);
1067	>	/* link new free list */
1068	>	upperlim = atfreelist + 8*(ATALLOCSZ-1);
1069	>	for (atp = atfreelist; atp < upperlim; atp += 8)
1070	>	atp->kid = atp + 8;
1071	>	atp->kid = NULL;
1072		}
1073	<	/* super-sample */
1074	<	for (i = ns; i > 0; i--) {
1075	<	rayorigin(&ar, r, AMBIENT, 0.5);        /* pretested */
1076	<	zd = sqrt((div[0].t+frandom())/nt);
1077	<	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));
1073	>	atp = atfreelist;
1074	>	atfreelist = atp->kid;
1075	>	memset((char *)atp, '\0', 8*sizeof(AMBTREE));
1076	>	return(atp);
1077	>	}
1078
1079	<	if (ne >= i) {          /* extract darkest division */
1080	<	ne--;
1081	<	if (div[ne].n > 1)
1082	<	scalecolor(div[ne].v, 1.0/div[ne].n);
1083	<	addcolor(acol, div[ne].v);
1084	<	}
1079	>
1080	>	static void
1081	>	freeambtree(                    /* free 8 ambient tree structs */
1082	>	AMBTREE  *atp
1083	>	)
1084	>	{
1085	>	atp->kid = atfreelist;
1086	>	atfreelist = atp;
1087	>	}
1088	>
1089	>
1090	>	static void
1091	>	unloadatree(                    /* unload an ambient value tree */
1092	>	AMBTREE  *at,
1093	>	unloadtf_t *f
1094	>	)
1095	>	{
1096	>	AMBVAL  *av;
1097	>	int  i;
1098	>	/* transfer values at this node */
1099	>	for (av = at->alist; av != NULL; av = at->alist) {
1100	>	at->alist = av->next;
1101	>	(*f)(av);
1102		}
1103	<	scalecolor(acol, 1.0/ndivs);
1104	<	if (arad <= FTINY)
1105	<	arad = FHUGE;
1106	<	else
1107	<	arad = (ndivs+ns) / arad / sqrt(r->rweight);
1108	<	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);
1103	>	if (at->kid == NULL)
1104	>	return;
1105	>	for (i = 0; i < 8; i++)         /* transfer and free children */
1106	>	unloadatree(at->kid+i, f);
1107	>	freeambtree(at->kid);
1108	>	at->kid = NULL;
1109		}
1110
1111
1112	+	static struct avl {
1113	+	AMBVAL  *p;
1114	+	unsigned long   t;
1115	+	}       *avlist1;                       /* ambient value list with ticks */
1116	+	static AMBVAL   **avlist2;              /* memory positions for sorting */
1117	+	static int      i_avlist;               /* index for lists */
1118	+
1119	+	static int alatcmp(const void *av1, const void *av2);
1120	+
1121	+	static void
1122	+	avfree(AMBVAL *av)
1123	+	{
1124	+	free(av);
1125	+	}
1126	+
1127	+	static void
1128	+	av2list(
1129	+	AMBVAL *av
1130	+	)
1131	+	{
1132	+	#ifdef DEBUG
1133	+	if (i_avlist >= nambvals)
1134	+	error(CONSISTENCY, "too many ambient values in av2list1");
1135	+	#endif
1136	+	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1137	+	avlist1[i_avlist++].t = av->latick;
1138	+	}
1139	+
1140	+
1141		static int
1142	<	ambcmp(d1, d2)                          /* decreasing order */
1143	<	AMBSAMP  *d1, *d2;
1142	>	alatcmp(                        /* compare ambient values for MRA */
1143	>	const void *av1,
1144	>	const void *av2
1145	>	)
1146		{
1147	<	if (d1->k < d2->k)
1148	<	return(1);
1149	<	if (d1->k > d2->k)
1147	>	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1148	>	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1149	>	}
1150	>
1151	>
1152	>	/* GW NOTE 2002/10/3:
1153	>	* I used to compare AMBVAL pointers, but found that this was the
1154	>	* cause of a serious consistency error with gcc, since the optimizer
1155	>	* uses some dangerous trick in pointer subtraction that
1156	>	* assumes pointers differ by exact struct size increments.
1157	>	*/
1158	>	static int
1159	>	aposcmp(                        /* compare ambient value positions */
1160	>	const void      *avp1,
1161	>	const void      *avp2
1162	>	)
1163	>	{
1164	>	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1165	>	if (diff < 0)
1166		return(-1);
1167	<	return(0);
1167	>	return(diff > 0);
1168		}
1169
1170
1171	<	static
1172	<	avsave(av)                              /* save an ambient value */
1173	<	AMBVAL  *av;
1171	>	static int
1172	>	avlmemi(                                /* find list position from address */
1173	>	AMBVAL  *avaddr
1174	>	)
1175		{
1176	<	#ifdef  AMBFLUSH
1177	<	static int  nunflshed = 0;
1178	<	#endif
1179	<	if (ambfp == NULL)
1176	>	AMBVAL  **avlpp;
1177	>
1178	>	avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2,
1179	>	nambvals, sizeof(AMBVAL *), &aposcmp);
1180	>	if (avlpp == NULL)
1181	>	error(CONSISTENCY, "address not found in avlmemi");
1182	>	return(avlpp - avlist2);
1183	>	}
1184	>
1185	>
1186	>	static void
1187	>	sortambvals(                    /* resort ambient values */
1188	>	int     always
1189	>	)
1190	>	{
1191	>	AMBTREE  oldatrunk;
1192	>	AMBVAL  tav, *tap, *pnext;
1193	>	int     i, j;
1194	>	/* see if it's time yet */
1195	>	if (!always && (ambclock++ < lastsort+sortintvl ||
1196	>	nambvals < SORT_THRESH))
1197		return;
1198	<	if (fwrite(av, sizeof(AMBVAL), 1, ambfp) != 1)
1199	<	goto writerr;
1200	<	#ifdef  AMBFLUSH
1201	<	if (++nunflshed >= AMBFLUSH) {
1202	<	if (fflush(ambfp) == EOF)
1203	<	goto writerr;
1204	<	nunflshed = 0;
1198	>	/*
1199	>	* The idea here is to minimize memory thrashing
1200	>	* in VM systems by improving reference locality.
1201	>	* We do this by periodically sorting our stored ambient
1202	>	* values in memory in order of most recently to least
1203	>	* recently accessed.  This ordering was chosen so that new
1204	>	* ambient values (which tend to be less important) go into
1205	>	* higher memory with the infrequently accessed values.
1206	>	*      Since we expect our values to need sorting less
1207	>	* frequently as the process continues, we double our
1208	>	* waiting interval after each call.
1209	>	*      This routine is also called by setambacc() with
1210	>	* the "always" parameter set to 1 so that the ambient
1211	>	* tree will be rebuilt with the new accuracy parameter.
1212	>	*/
1213	>	if (tracktime) {                /* allocate pointer arrays to sort */
1214	>	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1215	>	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1216	>	} else {
1217	>	avlist2 = NULL;
1218	>	avlist1 = NULL;
1219		}
1220	+	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1221	+	if (avlist2 != NULL)
1222	+	free((void *)avlist2);
1223	+	if (always) {           /* rebuild without sorting */
1224	+	oldatrunk = atrunk;
1225	+	atrunk.alist = NULL;
1226	+	atrunk.kid = NULL;
1227	+	unloadatree(&oldatrunk, avinsert);
1228	+	}
1229	+	} else {                        /* sort memory by last access time */
1230	+	/*
1231	+	* Sorting memory is tricky because it isn't contiguous.
1232	+	* We have to sort an array of pointers by MRA and also
1233	+	* by memory position.  We then copy values in "loops"
1234	+	* to minimize memory hits.  Nevertheless, we will visit
1235	+	* everyone at least twice, and this is an expensive process
1236	+	* when we're thrashing, which is when we need to do it.
1237	+	*/
1238	+	#ifdef DEBUG
1239	+	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1240	+	nambvals, ambclock);
1241	+	eputs(errmsg);
1242		#endif
1243	<	return;
1244	<	writerr:
1245	<	error(SYSTEM, "error writing ambient file");
1243	>	i_avlist = 0;
1244	>	unloadatree(&atrunk, av2list);  /* empty current tree */
1245	>	#ifdef DEBUG
1246	>	if (i_avlist < nambvals)
1247	>	error(CONSISTENCY, "missing ambient values in sortambvals");
1248	>	#endif
1249	>	qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp);
1250	>	qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1251	>	for (i = 0; i < nambvals; i++) {
1252	>	if (avlist1[i].p == NULL)
1253	>	continue;
1254	>	tap = avlist2[i];
1255	>	tav = *tap;
1256	>	for (j = i; (pnext = avlist1[j].p) != tap;
1257	>	j = avlmemi(pnext)) {
1258	>	*(avlist2[j]) = *pnext;
1259	>	avinsert(avlist2[j]);
1260	>	avlist1[j].p = NULL;
1261	>	}
1262	>	*(avlist2[j]) = tav;
1263	>	avinsert(avlist2[j]);
1264	>	avlist1[j].p = NULL;
1265	>	}
1266	>	free((void *)avlist1);
1267	>	free((void *)avlist2);
1268	>	/* compute new sort interval */
1269	>	sortintvl = ambclock - lastsort;
1270	>	if (sortintvl >= MAX_SORT_INTVL/2)
1271	>	sortintvl = MAX_SORT_INTVL;
1272	>	else
1273	>	sortintvl <<= 1;        /* wait twice as long next */
1274	>	#ifdef DEBUG
1275	>	eputs("done\n");
1276	>	#endif
1277	>	}
1278	>	if (ambclock >= MAXACLOCK)
1279	>	ambclock = MAXACLOCK/2;
1280	>	lastsort = ambclock;
1281		}
1282
1283
1284	<	static
1285	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
1286	<	AMBVAL  *aval;
1287	<	register AMBTREE  *at;
1288	<	FVECT  c0;
1289	<	double  s;
1284	>	#ifdef  F_SETLKW
1285	>
1286	>	static void
1287	>	aflock(                 /* lock/unlock ambient file */
1288	>	int  typ
1289	>	)
1290		{
1291	<	FVECT  ck0;
456	<	int  branch;
457	<	register AMBVAL  *av;
458	<	register int  i;
1291	>	static struct flock  fls;       /* static so initialized to zeroes */
1292
1293	<	if ((av = newambval()) == NULL)
1294	<	goto memerr;
1295	<	bcopy(aval, av, sizeof(AMBVAL));
1296	<	VCOPY(ck0, c0);
1297	<	while (s*(OCTSCALE/2) > av->rad*ambacc) {
1298	<	if (at->kid == NULL)
1299	<	if ((at->kid = newambtree()) == NULL)
1300	<	goto memerr;
1301	<	s *= 0.5;
1302	<	branch = 0;
1303	<	for (i = 0; i < 3; i++)
1304	<	if (av->pos[i] > ck0[i] + s) {
1305	<	ck0[i] += s;
1306	<	branch |= 1 << i;
1293	>	if (typ == fls.l_type)          /* already called? */
1294	>	return;
1295	>	fls.l_type = typ;
1296	>	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1297	>	error(SYSTEM, "cannot (un)lock ambient file");
1298	>	}
1299	>
1300	>
1301	>	int
1302	>	ambsync(void)                   /* synchronize ambient file */
1303	>	{
1304	>	long  flen;
1305	>	AMBVAL  avs;
1306	>	int  n;
1307	>
1308	>	if (ambfp == NULL)      /* no ambient file? */
1309	>	return(0);
1310	>	/* gain appropriate access */
1311	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1312	>	/* see if file has grown */
1313	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1314	>	goto seekerr;
1315	>	if ((n = flen - lastpos) > 0) {         /* file has grown */
1316	>	if (ambinp == NULL) {           /* use duplicate filedes */
1317	>	ambinp = fdopen(dup(fileno(ambfp)), "r");
1318	>	if (ambinp == NULL)
1319	>	error(SYSTEM, "fdopen failed in ambsync");
1320	>	}
1321	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1322	>	goto seekerr;
1323	>	while (n >= AMBVALSIZ) {        /* load contributed values */
1324	>	if (!readambval(&avs, ambinp)) {
1325	>	sprintf(errmsg,
1326	>	"ambient file \"%s\" corrupted near character %ld",
1327	>	ambfile, flen - n);
1328	>	error(WARNING, errmsg);
1329	>	break;
1330		}
1331	<	at = at->kid + branch;
1331	>	avstore(&avs);
1332	>	n -= AMBVALSIZ;
1333	>	}
1334	>	lastpos = flen - n;
1335	>	/*** seek always as safety measure
1336	>	if (n) ***/                     /* alignment */
1337	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1338	>	goto seekerr;
1339		}
1340	<	av->next = at->alist;
1341	<	at->alist = av;
1342	<	return;
1343	<	memerr:
1344	<	error(SYSTEM, "out of memory in avinsert");
1340	>	n = fflush(ambfp);                      /* calls write() at last */
1341	>	if (n != EOF)
1342	>	lastpos += (long)nunflshed*AMBVALSIZ;
1343	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1344	>	goto seekerr;
1345	>
1346	>	aflock(F_UNLCK);                        /* release file */
1347	>	nunflshed = 0;
1348	>	return(n);
1349	>	seekerr:
1350	>	error(SYSTEM, "seek failed in ambsync");
1351	>	return -1; /* pro forma return */
1352		}
1353	+
1354	+	#else   /* ! F_SETLKW */
1355	+
1356	+	int
1357	+	ambsync(void)                   /* flush ambient file */
1358	+	{
1359	+	if (ambfp == NULL)
1360	+	return(0);
1361	+	nunflshed = 0;
1362	+	return(fflush(ambfp));
1363	+	}
1364	+
1365	+	#endif  /* ! F_SETLKW */

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