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

Comparing ray/src/rt/ambient.c (file contents):
Revision 1.8 by greg, Fri Jan 12 11:30:59 1990 UTC vs.
Revision 2.98 by greg, Sun Aug 23 00:17:12 2015 UTC

#	Line 1 | Line 1
1	<	/* Copyright (c) 1986 Regents of the University of California */
2	<
3	<	#ifndef lint
4	<	static char SCCSid[] = "$SunId$ LBL";
5	<	#endif
6	<
1	>	static const char       RCSid[] = "$Id$";
2		/*
3		*  ambient.c - routines dealing with ambient (inter-reflected) component.
4		*
5	<	*  The macro AMBFLUSH (if defined) is the number of ambient values
11	<	*      to wait before flushing to the ambient file.
12	<	*
13	<	*     5/9/86
5	>	*  Declarations of external symbols in ambient.h
6		*/
7
8	<	#include  "ray.h"
8	>	#include "copyright.h"
9
10	<	#include  "octree.h"
10	>	#include <string.h>
11
12	+	#include  "platform.h"
13	+	#include  "ray.h"
14		#include  "otypes.h"
15	<
15	>	#include  "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 */
32	<	extern int  ambssamp;           /* number of super-samples */
33	<	extern int  ambounce;           /* number of ambient bounces */
34	<	extern char  *amblist[];        /* ambient include/exclude list */
35	<	extern int  ambincl;            /* include == 1, exclude == 0 */
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[256]={0};        /* ambient include/exclude set */
31	>	double  maxarad;                /* maximum ambient radius */
32	>	double  minarad;                /* minimum ambient radius */
33
34	<	double  maxarad;                /* maximum ambient radius */
40	<	double  minarad;                /* minimum ambient radius */
34	>	static AMBTREE  atrunk;         /* our ambient trunk node */
35
36	<	typedef struct ambval {
37	<	FVECT  pos;             /* position in space */
44	<	FVECT  dir;             /* normal direction */
45	<	int  lvl;               /* recursion level of parent ray */
46	<	float  weight;          /* weight of parent ray */
47	<	COLOR  val;             /* computed ambient value */
48	<	float  rad;             /* validity radius */
49	<	struct ambval  *next;   /* next in list */
50	<	}  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
57	–	typedef struct {
58	–	float  k;               /* error contribution per sample */
59	–	COLOR  v;               /* ray sum */
60	–	int  n;                 /* number of samples */
61	–	short  t, p;            /* theta, phi indices */
62	–	}  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	<	OBJECT  obj;
109	<	AMBVAL  amb;
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
82	–	maxarad = thescene.cusize / 2.0;                /* maximum radius */
83	–	/* minimum radius */
84	–	minarad = ambres > 0 ? thescene.cusize/ambres : 0.0;
124
125	<	/* open ambient file */
126	<	if (afile != NULL)
127	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
128	<	while (fread(&amb, sizeof(AMBVAL), 1, ambfp) == 1)
129	<	avinsert(&amb, &atrunk, thescene.cuorg,
130	<	thescene.cusize);
131	<	/* align */
132	<	fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1);
133	<	} else if ((ambfp = fopen(afile, "w")) == NULL) {
134	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
135	<	afile);
136	<	error(SYSTEM, errmsg);
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	>	fclose(ambfp);          /* close file so no writes */
175	>	ambfp = NULL;
176	>	return;                 /* avoid ambsync() */
177		}
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	+	#ifndef _WIN32 /* XXX we need a replacement for that one */
188	+	ftruncate(fileno(ambfp), (off_t)lastpos);
189	+	#endif
190	+	}
191	+	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
192	+	initambfile(1);                 /* else create new file */
193	+	fflush(ambfp);
194	+	lastpos = ftell(ambfp);
195	+	} else {
196	+	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
197	+	error(SYSTEM, errmsg);
198	+	}
199	+	#ifdef  F_SETLKW
200	+	aflock(F_UNLCK);                        /* release file */
201	+	#endif
202		}
203
204
205	<	ambnotify(obj)                  /* record new modifier */
206	<	OBJECT  obj;
205	>	void
206	>	ambdone(void)                   /* close ambient file and free memory */
207		{
208	<	register OBJREC  *o = objptr(obj);
209	<	register char  **amblp;
208	>	if (ambfp != NULL) {            /* close ambient file */
209	>	ambsync();
210	>	fclose(ambfp);
211	>	ambfp = NULL;
212	>	if (ambinp != NULL) {
213	>	fclose(ambinp);
214	>	ambinp = NULL;
215	>	}
216	>	lastpos = -1;
217	>	}
218	>	/* free ambient tree */
219	>	unloadatree(&atrunk, &avfree);
220	>	/* reset state variables */
221	>	avsum = 0.;
222	>	navsum = 0;
223	>	nambvals = 0;
224	>	nambshare = 0;
225	>	ambclock = 0;
226	>	lastsort = 0;
227	>	sortintvl = SORT_INTVL;
228	>	}
229
230	<	if (!ismodifier(o->otype))
230	>
231	>	void
232	>	ambnotify(                      /* record new modifier */
233	>	OBJECT  obj
234	>	)
235	>	{
236	>	static int  hitlimit = 0;
237	>	OBJREC   *o;
238	>	char  **amblp;
239	>
240	>	if (obj == OVOID) {             /* starting over */
241	>	ambset[0] = 0;
242	>	hitlimit = 0;
243		return;
244	+	}
245	+	o = objptr(obj);
246	+	if (hitlimit || !ismodifier(o->otype))
247	+	return;
248		for (amblp = amblist; *amblp != NULL; amblp++)
249		if (!strcmp(o->oname, *amblp)) {
250	+	if (ambset[0] >= MAXASET) {
251	+	error(WARNING, "too many modifiers in ambient list");
252	+	hitlimit++;
253	+	return;         /* should this be fatal? */
254	+	}
255		insertelem(ambset, obj);
256		return;
257		}
258		}
259
260	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
261
262	<	ambient(acol, r)                /* compute ambient component for ray */
263	<	COLOR  acol;
264	<	register RAY  *r;
262	>	#ifndef OLDAMB
263	>
264	>	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
265	>
266	>	static int      plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang);
267	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
268	>	AMBTREE *at, FVECT c0, double s);
269	>	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
270	>	static int      extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
271	>	FVECT uvw[3]);
272	>
273	>	void
274	>	multambient(            /* compute ambient component & multiply by coef. */
275	>	COLOR  aval,
276	>	RAY  *r,
277	>	FVECT  nrm
278	>	)
279		{
280		static int  rdepth = 0;                 /* ambient recursion */
281	<	double  wsum;
281	>	COLOR   acol, caustic;
282	>	int     ok;
283	>	double  d, l;
284
285	<	rdepth++;                               /* increment level */
285	>	/* PMAP: Factor in ambient from photon map, if enabled and ray is
286	>	* ambient. Return as all ambient components accounted for, else
287	>	* continue. */
288	>	if (ambPmap(aval, r, rdepth))
289	>	return;
290
291	+	/* PMAP: Factor in specular-diffuse ambient (caustics) from photon
292	+	* map, if enabled and ray is primary, else caustic is zero.  Continue
293	+	* with RADIANCE ambient calculation */
294	+	copycolor(caustic, aval);
295	+	ambPmapCaustic(caustic, r, rdepth);
296	+
297		if (ambdiv <= 0)                        /* no ambient calculation */
298		goto dumbamb;
299		/* check number of bounces */
300	<	if (rdepth > ambounce)
300	>	if (rdepth >= ambounce)
301		goto dumbamb;
302		/* check ambient list */
303		if (ambincl != -1 && r->ro != NULL &&
#	Line 135 | Line 305 | register RAY  *r;
305		goto dumbamb;
306
307		if (ambacc <= FTINY) {                  /* no ambient storage */
308	<	if (doambient(acol, r) == 0.0)
308	>	copycolor(acol, aval);
309	>	rdepth++;
310	>	ok = doambient(acol, r, r->rweight,
311	>	NULL, NULL, NULL, NULL, NULL);
312	>	rdepth--;
313	>	if (!ok)
314		goto dumbamb;
315	<	goto done;
315	>	copycolor(aval, acol);
316	>
317	>	/* PMAP: add in caustic */
318	>	addcolor(aval, caustic);
319	>	return;
320		}
321	<	/* get ambient value */
321	>
322	>	if (tracktime)                          /* sort to minimize thrashing */
323	>	sortambvals(0);
324	>	/* interpolate ambient value */
325		setcolor(acol, 0.0, 0.0, 0.0);
326	<	wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize);
327	<	if (wsum > FTINY)
328	<	scalecolor(acol, 1.0/wsum);
329	<	else if (makeambient(acol, r) == 0.0)
330	<	goto dumbamb;
331	<	goto done;
326	>	d = sumambient(acol, r, nrm, rdepth,
327	>	&atrunk, thescene.cuorg, thescene.cusize);
328	>
329	>	if (d > FTINY) {
330	>	d = 1.0/d;
331	>	scalecolor(acol, d);
332	>	multcolor(aval, acol);
333
334	+	/* PMAP: add in caustic */
335	+	addcolor(aval, caustic);
336	+	return;
337	+	}
338	+
339	+	rdepth++;                               /* need to cache new value */
340	+	ok = makeambient(acol, r, nrm, rdepth-1);
341	+	rdepth--;
342	+
343	+	if (ok) {
344	+	multcolor(aval, acol);          /* computed new value */
345	+
346	+	/* PMAP: add in caustic */
347	+	addcolor(aval, caustic);
348	+	return;
349	+	}
350	+
351		dumbamb:                                        /* return global value */
352	<	copycolor(acol, ambval);
353	<	done:                                           /* must finish here! */
352	>	if ((ambvwt <= 0) | (navsum == 0)) {
353	>	multcolor(aval, ambval);
354	>
355	>	/* PMAP: add in caustic */
356	>	addcolor(aval, caustic);
357	>	return;
358	>	}
359	>
360	>	l = bright(ambval);                     /* average in computations */
361	>	if (l > FTINY) {
362	>	d = (log(l)*(double)ambvwt + avsum) /
363	>	(double)(ambvwt + navsum);
364	>	d = exp(d) / l;
365	>	scalecolor(aval, d);
366	>	multcolor(aval, ambval);        /* apply color of ambval */
367	>	} else {
368	>	d = exp( avsum / (double)navsum );
369	>	scalecolor(aval, d);            /* neutral color */
370	>	}
371	>	}
372	>
373	>
374	>	/* Plug a potential leak where ambient cache value is occluded */
375	>	static int
376	>	plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
377	>	{
378	>	const double    cost70sq = 0.1169778;   /* cos(70deg)^2 */
379	>	RAY             rtst;
380	>	FVECT           vdif;
381	>	double          normdot, ndotd, nadotd;
382	>	double          a, b, c, t[2];
383	>
384	>	ang += 2.*PI*(ang < 0);                 /* check direction flags */
385	>	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
386	>	return(0);
387	>	/*
388	>	* Generate test ray, targeting 20 degrees above sample point plane
389	>	* along surface normal from cache position.  This should be high
390	>	* enough to miss local geometry we don't really care about.
391	>	*/
392	>	VSUB(vdif, ap->pos, r->rop);
393	>	normdot = DOT(anorm, r->ron);
394	>	ndotd = DOT(vdif, r->ron);
395	>	nadotd = DOT(vdif, anorm);
396	>	a = normdot*normdot - cost70sq;
397	>	b = 2.0*(normdot*ndotd - nadotd*cost70sq);
398	>	c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq;
399	>	if (quadratic(t, a, b, c) != 2)
400	>	return(1);                      /* should rarely happen */
401	>	if (t[1] <= FTINY)
402	>	return(0);                      /* should fail behind test */
403	>	rayorigin(&rtst, SHADOW, r, NULL);
404	>	VSUM(rtst.rdir, vdif, anorm, t[1]);     /* further dist. > plane */
405	>	rtst.rmax = normalize(rtst.rdir);       /* short ray test */
406	>	while (localhit(&rtst, &thescene)) {    /* check for occluder */
407	>	if (rtst.ro->omod != OVOID &&
408	>	(rtst.clipset == NULL ||
409	>	!inset(rtst.clipset, rtst.ro->omod)))
410	>	return(1);              /* plug light leak */
411	>	VCOPY(rtst.rorg, rtst.rop);     /* skip invisible surface */
412	>	rtst.rmax -= rtst.rot;
413	>	rayclear(&rtst);
414	>	}
415	>	return(0);                              /* seems we're OK */
416	>	}
417	>
418	>
419	>	static double
420	>	sumambient(             /* get interpolated ambient value */
421	>	COLOR  acol,
422	>	RAY  *r,
423	>	FVECT  rn,
424	>	int  al,
425	>	AMBTREE  *at,
426	>	FVECT  c0,
427	>	double  s
428	>	)
429	>	{                       /* initial limit is 10 degrees plus ambacc radians */
430	>	const double    minangle = 10.0 * PI/180.;
431	>	double          maxangle = minangle + ambacc;
432	>	double          wsum = 0.0;
433	>	FVECT           ck0;
434	>	int             i, j;
435	>	AMBVAL          *av;
436	>
437	>	if (at->kid != NULL) {          /* sum children first */
438	>	s *= 0.5;
439	>	for (i = 0; i < 8; i++) {
440	>	for (j = 0; j < 3; j++) {
441	>	ck0[j] = c0[j];
442	>	if (1<<j & i)
443	>	ck0[j] += s;
444	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
445	>	break;
446	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
447	>	break;
448	>	}
449	>	if (j == 3)
450	>	wsum += sumambient(acol, r, rn, al,
451	>	at->kid+i, ck0, s);
452	>	}
453	>	/* good enough? */
454	>	if (wsum >= 0.05 && s > minarad*10.0)
455	>	return(wsum);
456	>	}
457	>	/* adjust maximum angle */
458	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
459	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
460	>	/* sum this node */
461	>	for (av = at->alist; av != NULL; av = av->next) {
462	>	double  u, v, d, delta_r2, delta_t2;
463	>	COLOR   ct;
464	>	FVECT   uvw[3];
465	>	/* record access */
466	>	if (tracktime)
467	>	av->latick = ambclock;
468	>	/*
469	>	*  Ambient level test
470	>	*/
471	>	if (av->lvl > al ||     /* list sorted, so this works */
472	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
473	>	break;
474	>	/*
475	>	*  Direction test using unperturbed normal
476	>	*/
477	>	decodedir(uvw[2], av->ndir);
478	>	d = DOT(uvw[2], r->ron);
479	>	if (d <= 0.0)           /* >= 90 degrees */
480	>	continue;
481	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
482	>	if (delta_r2 >= maxangle*maxangle)
483	>	continue;
484	>	/*
485	>	*  Modified ray behind test
486	>	*/
487	>	VSUB(ck0, r->rop, av->pos);
488	>	d = DOT(ck0, uvw[2]);
489	>	if (d < -minarad*ambacc-.001)
490	>	continue;
491	>	d /= av->rad[0];
492	>	delta_t2 = d*d;
493	>	if (delta_t2 >= ambacc*ambacc)
494	>	continue;
495	>	/*
496	>	*  Elliptical radii test based on Hessian
497	>	*/
498	>	decodedir(uvw[0], av->udir);
499	>	VCROSS(uvw[1], uvw[2], uvw[0]);
500	>	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
501	>	delta_t2 += d*d;
502	>	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
503	>	delta_t2 += d*d;
504	>	if (delta_t2 >= ambacc*ambacc)
505	>	continue;
506	>	/*
507	>	*  Test for potential light leak
508	>	*/
509	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
510	>	continue;
511	>	/*
512	>	*  Extrapolate value and compute final weight (hat function)
513	>	*/
514	>	if (!extambient(ct, av, r->rop, rn, uvw))
515	>	continue;
516	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
517	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
518	>	scalecolor(ct, d);
519	>	addcolor(acol, ct);
520	>	wsum += d;
521	>	}
522	>	return(wsum);
523	>	}
524	>
525	>
526	>	static int
527	>	makeambient(            /* make a new ambient value for storage */
528	>	COLOR  acol,
529	>	RAY  *r,
530	>	FVECT  rn,
531	>	int  al
532	>	)
533	>	{
534	>	AMBVAL  amb;
535	>	FVECT   uvw[3];
536	>	int     i;
537	>
538	>	amb.weight = 1.0;                       /* compute weight */
539	>	for (i = al; i-- > 0; )
540	>	amb.weight *= AVGREFL;
541	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
542	>	amb.weight = 1.25*r->rweight;
543	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
544	>	/* compute ambient */
545	>	i = doambient(acol, r, amb.weight,
546	>	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
547	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
548	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
549	>	return(i);
550	>	/* store value */
551	>	VCOPY(amb.pos, r->rop);
552	>	amb.ndir = encodedir(r->ron);
553	>	amb.udir = encodedir(uvw[0]);
554	>	amb.lvl = al;
555	>	copycolor(amb.val, acol);
556	>	/* insert into tree */
557	>	avsave(&amb);                           /* and save to file */
558	>	if (rn != r->ron) {                     /* texture */
559	>	VCOPY(uvw[2], r->ron);
560	>	extambient(acol, &amb, r->rop, rn, uvw);
561	>	}
562	>	return(1);
563	>	}
564	>
565	>
566	>	static int
567	>	extambient(             /* extrapolate value at pv, nv */
568	>	COLOR  cr,
569	>	AMBVAL   *ap,
570	>	FVECT  pv,
571	>	FVECT  nv,
572	>	FVECT  uvw[3]
573	>	)
574	>	{
575	>	const double    min_d = 0.05;
576	>	static FVECT    my_uvw[3];
577	>	FVECT           v1;
578	>	int             i;
579	>	double          d = 1.0;        /* zeroeth order */
580	>
581	>	if (uvw == NULL) {              /* need local coordinates? */
582	>	decodedir(my_uvw[2], ap->ndir);
583	>	decodedir(my_uvw[0], ap->udir);
584	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
585	>	uvw = my_uvw;
586	>	}
587	>	for (i = 3; i--; )              /* gradient due to translation */
588	>	d += (pv[i] - ap->pos[i]) *
589	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
590	>
591	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
592	>	for (i = 3; i--; )
593	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
594	>
595	>	if (d < min_d)                  /* should not use if we can avoid it */
596	>	d = min_d;
597	>	copycolor(cr, ap->val);
598	>	scalecolor(cr, d);
599	>	return(d > min_d);
600	>	}
601	>
602	>
603	>	static void
604	>	avinsert(                               /* insert ambient value in our tree */
605	>	AMBVAL *av
606	>	)
607	>	{
608	>	AMBTREE  *at;
609	>	AMBVAL  *ap;
610	>	AMBVAL  avh;
611	>	FVECT  ck0;
612	>	double  s;
613	>	int  branch;
614	>	int  i;
615	>
616	>	if (av->rad[0] <= FTINY)
617	>	error(CONSISTENCY, "zero ambient radius in avinsert");
618	>	at = &atrunk;
619	>	VCOPY(ck0, thescene.cuorg);
620	>	s = thescene.cusize;
621	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
622	>	if (at->kid == NULL)
623	>	if ((at->kid = newambtree()) == NULL)
624	>	error(SYSTEM, "out of memory in avinsert");
625	>	s *= 0.5;
626	>	branch = 0;
627	>	for (i = 0; i < 3; i++)
628	>	if (av->pos[i] > ck0[i] + s) {
629	>	ck0[i] += s;
630	>	branch |= 1 << i;
631	>	}
632	>	at = at->kid + branch;
633	>	}
634	>	avh.next = at->alist;           /* order by increasing level */
635	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
636	>	if ( ap->next->lvl > av->lvl ||
637	>	(ap->next->lvl == av->lvl) &
638	>	(ap->next->weight <= av->weight) )
639	>	break;
640	>	av->next = ap->next;
641	>	ap->next = (AMBVAL*)av;
642	>	at->alist = avh.next;
643	>	}
644	>
645	>
646	>	#else /* ! NEWAMB */
647	>
648	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
649	>	AMBTREE *at, FVECT c0, double s);
650	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
651	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
652	>
653	>
654	>	void
655	>	multambient(            /* compute ambient component & multiply by coef. */
656	>	COLOR  aval,
657	>	RAY  *r,
658	>	FVECT  nrm
659	>	)
660	>	{
661	>	static int  rdepth = 0;                 /* ambient recursion */
662	>	COLOR   acol, caustic;
663	>	double  d, l;
664	>
665	>	/* PMAP: Factor in ambient from global photon map (if enabled) and return
666	>	* as all ambient components accounted for */
667	>	if (ambPmap(aval, r, rdepth))
668	>	return;
669	>
670	>	/* PMAP: Otherwise factor in ambient from caustic photon map
671	>	* (ambPmapCaustic() returns zero if caustic photons disabled) and
672	>	* continue with RADIANCE ambient calculation */
673	>	copycolor(caustic, aval);
674	>	ambPmapCaustic(caustic, r, rdepth);
675	>
676	>	if (ambdiv <= 0)                        /* no ambient calculation */
677	>	goto dumbamb;
678	>	/* check number of bounces */
679	>	if (rdepth >= ambounce)
680	>	goto dumbamb;
681	>	/* check ambient list */
682	>	if (ambincl != -1 && r->ro != NULL &&
683	>	ambincl != inset(ambset, r->ro->omod))
684	>	goto dumbamb;
685	>
686	>	if (ambacc <= FTINY) {                  /* no ambient storage */
687	>	copycolor(acol, aval);
688	>	rdepth++;
689	>	d = doambient(acol, r, r->rweight, NULL, NULL);
690	>	rdepth--;
691	>	if (d <= FTINY)
692	>	goto dumbamb;
693	>	copycolor(aval, acol);
694	>
695	>	/* PMAP: add in caustic */
696	>	addcolor(aval, caustic);
697	>	return;
698	>	}
699	>
700	>	if (tracktime)                          /* sort to minimize thrashing */
701	>	sortambvals(0);
702	>	/* interpolate ambient value */
703	>	setcolor(acol, 0.0, 0.0, 0.0);
704	>	d = sumambient(acol, r, nrm, rdepth,
705	>	&atrunk, thescene.cuorg, thescene.cusize);
706	>
707	>	if (d > FTINY) {
708	>	d = 1.0/d;
709	>	scalecolor(acol, d);
710	>	multcolor(aval, acol);
711	>
712	>	/* PMAP: add in caustic */
713	>	addcolor(aval, caustic);
714	>	return;
715	>	}
716	>
717	>	rdepth++;                               /* need to cache new value */
718	>	d = makeambient(acol, r, nrm, rdepth-1);
719		rdepth--;
720	+
721	+	if (d > FTINY) {
722	+	multcolor(aval, acol);          /* got new value */
723	+
724	+	/* PMAP: add in caustic */
725	+	addcolor(aval, caustic);
726	+	return;
727	+	}
728	+
729	+	dumbamb:                                        /* return global value */
730	+	if ((ambvwt <= 0) | (navsum == 0)) {
731	+	multcolor(aval, ambval);
732	+
733	+	/* PMAP: add in caustic */
734	+	addcolor(aval, caustic);
735	+	return;
736	+	}
737	+
738	+	l = bright(ambval);                     /* average in computations */
739	+	if (l > FTINY) {
740	+	d = (log(l)*(double)ambvwt + avsum) /
741	+	(double)(ambvwt + navsum);
742	+	d = exp(d) / l;
743	+	scalecolor(aval, d);
744	+	multcolor(aval, ambval);        /* apply color of ambval */
745	+	} else {
746	+	d = exp( avsum / (double)navsum );
747	+	scalecolor(aval, d);            /* neutral color */
748	+	}
749		}
750
751
752	<	double
753	<	sumambient(acol, r, at, c0, s)          /* get interpolated ambient value */
754	<	COLOR  acol;
755	<	register RAY  *r;
756	<	AMBTREE  *at;
757	<	FVECT  c0;
758	<	double  s;
752	>	static double
753	>	sumambient(     /* get interpolated ambient value */
754	>	COLOR  acol,
755	>	RAY  *r,
756	>	FVECT  rn,
757	>	int  al,
758	>	AMBTREE  *at,
759	>	FVECT  c0,
760	>	double  s
761	>	)
762		{
763	<	extern double  sqrt();
167	<	double  d, e1, e2, wt, wsum;
763	>	double  d, e1, e2, wt, wsum;
764		COLOR  ct;
765		FVECT  ck0;
766		int  i;
767	<	register int  j;
768	<	register AMBVAL  *av;
769	<	/* do this node */
767	>	int  j;
768	>	AMBVAL   *av;
769	>
770		wsum = 0.0;
771	+	/* do this node */
772		for (av = at->alist; av != NULL; av = av->next) {
773	+	double  rn_dot = -2.0;
774	+	if (tracktime)
775	+	av->latick = ambclock;
776		/*
777	<	*  Ray strength test.
777	>	*  Ambient level test.
778		*/
779	<	if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY)
780	<	continue;
779	>	if (av->lvl > al ||     /* list sorted, so this works */
780	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
781	>	break;
782		/*
783		*  Ambient radius test.
784		*/
785	<	e1 = 0.0;
786	<	for (j = 0; j < 3; j++) {
186	<	d = av->pos[j] - r->rop[j];
187	<	e1 += d * d;
188	<	}
189	<	e1 /= av->rad * av->rad;
785	>	VSUB(ck0, av->pos, r->rop);
786	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
787		if (e1 > ambacc*ambacc*1.21)
788		continue;
789		/*
790	<	*  Normal direction test.
790	>	*  Direction test using closest normal.
791		*/
792	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
793	<	if (e2 < 0.0) e2 = 0.0;
794	<	if (e1 + e2 > ambacc*ambacc*1.21)
792	>	d = DOT(av->dir, r->ron);
793	>	if (rn != r->ron) {
794	>	rn_dot = DOT(av->dir, rn);
795	>	if (rn_dot > 1.0-FTINY)
796	>	rn_dot = 1.0-FTINY;
797	>	if (rn_dot >= d-FTINY) {
798	>	d = rn_dot;
799	>	rn_dot = -2.0;
800	>	}
801	>	}
802	>	e2 = (1.0 - d) * r->rweight;
803	>	if (e2 < 0.0)
804	>	e2 = 0.0;
805	>	else if (e1 + e2 > ambacc*ambacc*1.21)
806		continue;
807		/*
808		*  Ray behind test.
#	Line 203 | Line 811 | double  s;
811		for (j = 0; j < 3; j++)
812		d += (r->rop[j] - av->pos[j]) *
813		(av->dir[j] + r->ron[j]);
814	<	if (d < -minarad)
814	>	if (d*0.5 < -minarad*ambacc-.001)
815		continue;
816		/*
817		*  Jittering final test reduces image artifacts.
818		*/
819	<	wt = sqrt(e1) + sqrt(e2);
820	<	wt *= .9 + .2*frandom();
821	<	if (wt > ambacc)
819	>	e1 = sqrt(e1);
820	>	e2 = sqrt(e2);
821	>	wt = e1 + e2;
822	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
823		continue;
824	+	/*
825	+	*  Recompute directional error using perturbed normal
826	+	*/
827	+	if (rn_dot > 0.0) {
828	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
829	+	wt = e1 + e2;
830	+	}
831		if (wt <= 1e-3)
832		wt = 1e3;
833		else
834		wt = 1.0 / wt;
835		wsum += wt;
836	<	copycolor(ct, av->val);
836	>	extambient(ct, av, r->rop, rn);
837		scalecolor(ct, wt);
838		addcolor(acol, ct);
839		}
#	Line 236 | Line 852 | double  s;
852		break;
853		}
854		if (j == 3)
855	<	wsum += sumambient(acol, r, at->kid+i, ck0, s);
855	>	wsum += sumambient(acol, r, rn, al,
856	>	at->kid+i, ck0, s);
857		}
858		return(wsum);
859		}
860
861
862	<	double
863	<	makeambient(acol, r)            /* make a new ambient value */
864	<	COLOR  acol;
865	<	register RAY  *r;
862	>	static double
863	>	makeambient(            /* make a new ambient value for storage */
864	>	COLOR  acol,
865	>	RAY  *r,
866	>	FVECT  rn,
867	>	int  al
868	>	)
869		{
870	<	AMBVAL  amb;
870	>	AMBVAL  amb;
871	>	FVECT   gp, gd;
872	>	int     i;
873
874	<	amb.rad = doambient(acol, r);           /* compute ambient */
875	<	if (amb.rad == 0.0)
874	>	amb.weight = 1.0;                       /* compute weight */
875	>	for (i = al; i-- > 0; )
876	>	amb.weight *= AVGREFL;
877	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
878	>	amb.weight = 1.25*r->rweight;
879	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
880	>	/* compute ambient */
881	>	amb.rad = doambient(acol, r, amb.weight, gp, gd);
882	>	if (amb.rad <= FTINY) {
883	>	setcolor(acol, 0.0, 0.0, 0.0);
884		return(0.0);
885	<	/* store it */
885	>	}
886	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
887	>	/* store value */
888		VCOPY(amb.pos, r->rop);
889		VCOPY(amb.dir, r->ron);
890	<	amb.lvl = r->rlvl;
259	<	amb.weight = r->rweight;
890	>	amb.lvl = al;
891		copycolor(amb.val, acol);
892	+	VCOPY(amb.gpos, gp);
893	+	VCOPY(amb.gdir, gd);
894		/* insert into tree */
895	<	avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize);
896	<	avsave(&amb);                           /* write to file */
895	>	avsave(&amb);                           /* and save to file */
896	>	if (rn != r->ron)
897	>	extambient(acol, &amb, r->rop, rn);     /* texture */
898		return(amb.rad);
899		}
900
901
902	<	double
903	<	doambient(acol, r)                      /* compute ambient component */
904	<	COLOR  acol;
905	<	register RAY  *r;
902	>	static void
903	>	extambient(             /* extrapolate value at pv, nv */
904	>	COLOR  cr,
905	>	AMBVAL   *ap,
906	>	FVECT  pv,
907	>	FVECT  nv
908	>	)
909		{
910	<	extern int  ambcmp();
911	<	extern double  sin(), cos(), sqrt();
912	<	double  phi, xd, yd, zd;
276	<	double  b, b2;
277	<	register AMBSAMP  *div;
278	<	AMBSAMP  dnew;
279	<	RAY  ar;
280	<	FVECT  ux, uy;
281	<	double  arad;
282	<	int  ndivs, nt, np, ns, ne, i, j;
283	<	register int  k;
910	>	FVECT  v1;
911	>	int  i;
912	>	double  d;
913
914	<	setcolor(acol, 0.0, 0.0, 0.0);
915	<	/* set number of divisions */
916	<	nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5;
917	<	np = 2 * nt;
918	<	ndivs = nt * np;
919	<	/* check first */
920	<	if (ndivs == 0 || rayorigin(&ar, r, AMBIENT, 0.5) < 0)
921	<	return(0.0);
922	<	/* set number of super-samples */
923	<	ns = ambssamp * r->rweight + 0.5;
295	<	if (ns > 0) {
296	<	div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP));
297	<	if (div == NULL)
298	<	error(SYSTEM, "out of memory in doambient");
914	>	d = 1.0;                        /* zeroeth order */
915	>	/* gradient due to translation */
916	>	for (i = 0; i < 3; i++)
917	>	d += ap->gpos[i]*(pv[i]-ap->pos[i]);
918	>	/* gradient due to rotation */
919	>	VCROSS(v1, ap->dir, nv);
920	>	d += DOT(ap->gdir, v1);
921	>	if (d <= 0.0) {
922	>	setcolor(cr, 0.0, 0.0, 0.0);
923	>	return;
924		}
925	<	/* make axes */
926	<	uy[0] = uy[1] = uy[2] = 0.0;
927	<	for (k = 0; k < 3; k++)
928	<	if (r->ron[k] < 0.6 && r->ron[k] > -0.6)
925	>	copycolor(cr, ap->val);
926	>	scalecolor(cr, d);
927	>	}
928	>
929	>
930	>	static void
931	>	avinsert(                               /* insert ambient value in our tree */
932	>	AMBVAL *av
933	>	)
934	>	{
935	>	AMBTREE  *at;
936	>	AMBVAL  *ap;
937	>	AMBVAL  avh;
938	>	FVECT  ck0;
939	>	double  s;
940	>	int  branch;
941	>	int  i;
942	>
943	>	if (av->rad <= FTINY)
944	>	error(CONSISTENCY, "zero ambient radius in avinsert");
945	>	at = &atrunk;
946	>	VCOPY(ck0, thescene.cuorg);
947	>	s = thescene.cusize;
948	>	while (s*(OCTSCALE/2) > av->rad*ambacc) {
949	>	if (at->kid == NULL)
950	>	if ((at->kid = newambtree()) == NULL)
951	>	error(SYSTEM, "out of memory in avinsert");
952	>	s *= 0.5;
953	>	branch = 0;
954	>	for (i = 0; i < 3; i++)
955	>	if (av->pos[i] > ck0[i] + s) {
956	>	ck0[i] += s;
957	>	branch |= 1 << i;
958	>	}
959	>	at = at->kid + branch;
960	>	}
961	>	avh.next = at->alist;           /* order by increasing level */
962	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
963	>	if ( ap->next->lvl > av->lvl ||
964	>	(ap->next->lvl == av->lvl) &
965	>	(ap->next->weight <= av->weight) )
966		break;
967	<	uy[k] = 1.0;
968	<	fcross(ux, r->ron, uy);
969	<	normalize(ux);
970	<	fcross(uy, ux, r->ron);
971	<	/* sample divisions */
972	<	arad = 0.0;
973	<	ne = 0;
974	<	for (i = 0; i < nt; i++)
975	<	for (j = 0; j < np; j++) {
976	<	rayorigin(&ar, r, AMBIENT, 0.5);        /* pretested */
977	<	zd = sqrt((i+frandom())/nt);
978	<	phi = 2.0*PI * (j+frandom())/np;
979	<	xd = cos(phi) * zd;
980	<	yd = sin(phi) * zd;
981	<	zd = sqrt(1.0 - zd*zd);
982	<	for (k = 0; k < 3; k++)
983	<	ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k];
984	<	rayvalue(&ar);
985	<	if (ar.rot < FHUGE)
986	<	arad += 1.0 / ar.rot;
987	<	if (ns > 0) {                   /* save division */
988	<	div[ne].k = 0.0;
989	<	copycolor(div[ne].v, ar.rcol);
990	<	div[ne].n = 0;
991	<	div[ne].t = i; div[ne].p = j;
992	<	/* sum errors */
993	<	b = bright(ar.rcol);
994	<	if (i > 0) {            /* from above */
995	<	b2 = bright(div[ne-np].v) - b;
996	<	b2 *= b2 * 0.25;
997	<	div[ne].k += b2;
998	<	div[ne].n++;
999	<	div[ne-np].k += b2;
1000	<	div[ne-np].n++;
1001	<	}
1002	<	if (j > 0) {            /* from behind */
1003	<	b2 = bright(div[ne-1].v) - b;
1004	<	b2 *= b2 * 0.25;
1005	<	div[ne].k += b2;
1006	<	div[ne].n++;
1007	<	div[ne-1].k += b2;
1008	<	div[ne-1].n++;
1009	<	}
1010	<	if (j == np-1) {        /* around */
1011	<	b2 = bright(div[ne-(np-1)].v) - b;
1012	<	b2 *= b2 * 0.25;
1013	<	div[ne].k += b2;
1014	<	div[ne].n++;
1015	<	div[ne-(np-1)].k += b2;
1016	<	div[ne-(np-1)].n++;
1017	<	}
1018	<	ne++;
1019	<	} else
1020	<	addcolor(acol, ar.rcol);
1021	<	}
1022	<	for (k = 0; k < ne; k++) {              /* compute errors */
1023	<	if (div[k].n > 1)
1024	<	div[k].k /= div[k].n;
1025	<	div[k].n = 1;
967	>	av->next = ap->next;
968	>	ap->next = (AMBVAL*)av;
969	>	at->alist = avh.next;
970	>	}
971	>
972	>	#endif  /* ! NEWAMB */
973	>
974	>	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
975	>
976	>	static void
977	>	initambfile(            /* initialize ambient file */
978	>	int  cre8
979	>	)
980	>	{
981	>	extern char  *progname, *octname;
982	>	static char  *mybuf = NULL;
983	>
984	>	#ifdef  F_SETLKW
985	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
986	>	#endif
987	>	SET_FILE_BINARY(ambfp);
988	>	if (mybuf == NULL)
989	>	mybuf = (char *)bmalloc(BUFSIZ+8);
990	>	setbuf(ambfp, mybuf);
991	>	if (cre8) {                     /* new file */
992	>	newheader("RADIANCE", ambfp);
993	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
994	>	progname, colval(ambval,RED),
995	>	colval(ambval,GRN), colval(ambval,BLU),
996	>	ambvwt, ambounce, ambacc);
997	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
998	>	ambdiv, ambssamp, ambres);
999	>	if (octname != NULL)
1000	>	fputs(octname, ambfp);
1001	>	fputc('\n', ambfp);
1002	>	fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1003	>	fputnow(ambfp);
1004	>	fputformat(AMBFMT, ambfp);
1005	>	fputc('\n', ambfp);
1006	>	putambmagic(ambfp);
1007	>	} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
1008	>	error(USER, "bad ambient file");
1009	>	}
1010	>
1011	>
1012	>	static void
1013	>	avsave(                         /* insert and save an ambient value */
1014	>	AMBVAL  *av
1015	>	)
1016	>	{
1017	>	avstore(av);
1018	>	if (ambfp == NULL)
1019	>	return;
1020	>	if (writambval(av, ambfp) < 0)
1021	>	goto writerr;
1022	>	if (++nunflshed >= AMBFLUSH)
1023	>	if (ambsync() == EOF)
1024	>	goto writerr;
1025	>	return;
1026	>	writerr:
1027	>	error(SYSTEM, "error writing to ambient file");
1028	>	}
1029	>
1030	>
1031	>	static AMBVAL *
1032	>	avstore(                                /* allocate memory and save aval */
1033	>	AMBVAL  *aval
1034	>	)
1035	>	{
1036	>	AMBVAL  *av;
1037	>	double  d;
1038	>
1039	>	if ((av = newambval()) == NULL)
1040	>	error(SYSTEM, "out of memory in avstore");
1041	>	*av = *aval;
1042	>	av->latick = ambclock;
1043	>	av->next = NULL;
1044	>	nambvals++;
1045	>	d = bright(av->val);
1046	>	if (d > FTINY) {                /* add to log sum for averaging */
1047	>	avsum += log(d);
1048	>	navsum++;
1049		}
1050	<	/* sort the divisions */
1051	<	qsort(div, ne, sizeof(AMBSAMP), ambcmp);
1052	<	/* skim excess */
1053	<	while (ne > ns) {
1054	<	ne--;
1055	<	addcolor(acol, div[ne].v);
1050	>	avinsert(av);                   /* insert in our cache tree */
1051	>	return(av);
1052	>	}
1053	>
1054	>
1055	>	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
1056	>
1057	>	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
1058	>
1059	>
1060	>	static AMBTREE *
1061	>	newambtree(void)                                /* allocate 8 ambient tree structs */
1062	>	{
1063	>	AMBTREE  *atp, *upperlim;
1064	>
1065	>	if (atfreelist == NULL) {       /* get more nodes */
1066	>	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
1067	>	if (atfreelist == NULL)
1068	>	return(NULL);
1069	>	/* link new free list */
1070	>	upperlim = atfreelist + 8*(ATALLOCSZ-1);
1071	>	for (atp = atfreelist; atp < upperlim; atp += 8)
1072	>	atp->kid = atp + 8;
1073	>	atp->kid = NULL;
1074		}
1075	<	/* super-sample */
1076	<	for (i = ns; i > 0; i--) {
1077	<	rayorigin(&ar, r, AMBIENT, 0.5);        /* pretested */
1078	<	zd = sqrt((div[0].t+frandom())/nt);
1079	<	phi = 2.0*PI * (div[0].p+frandom())/np;
377	<	xd = cos(phi) * zd;
378	<	yd = sin(phi) * zd;
379	<	zd = sqrt(1.0 - zd*zd);
380	<	for (k = 0; k < 3; k++)
381	<	ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k];
382	<	rayvalue(&ar);
383	<	if (ar.rot < FHUGE)
384	<	arad += 1.0 / ar.rot;
385	<	/* recompute error */
386	<	copycolor(dnew.v, div[0].v);
387	<	addcolor(dnew.v, ar.rcol);
388	<	dnew.n = div[0].n + 1;
389	<	dnew.t = div[0].t; dnew.p = div[0].p;
390	<	b2 = bright(dnew.v)/dnew.n - bright(ar.rcol);
391	<	b2 = b2*b2 + div[0].k*(div[0].n*div[0].n);
392	<	dnew.k = b2/(dnew.n*dnew.n);
393	<	/* reinsert */
394	<	for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++)
395	<	bcopy(&div[k+1], &div[k], sizeof(AMBSAMP));
396	<	bcopy(&dnew, &div[k], sizeof(AMBSAMP));
1075	>	atp = atfreelist;
1076	>	atfreelist = atp->kid;
1077	>	memset((char *)atp, '\0', 8*sizeof(AMBTREE));
1078	>	return(atp);
1079	>	}
1080
1081	<	if (ne >= i) {          /* extract darkest division */
1082	<	ne--;
1083	<	if (div[ne].n > 1)
1084	<	scalecolor(div[ne].v, 1.0/div[ne].n);
1085	<	addcolor(acol, div[ne].v);
1086	<	}
1081	>
1082	>	static void
1083	>	freeambtree(                    /* free 8 ambient tree structs */
1084	>	AMBTREE  *atp
1085	>	)
1086	>	{
1087	>	atp->kid = atfreelist;
1088	>	atfreelist = atp;
1089	>	}
1090	>
1091	>
1092	>	static void
1093	>	unloadatree(                    /* unload an ambient value tree */
1094	>	AMBTREE  *at,
1095	>	unloadtf_t *f
1096	>	)
1097	>	{
1098	>	AMBVAL  *av;
1099	>	int  i;
1100	>	/* transfer values at this node */
1101	>	for (av = at->alist; av != NULL; av = at->alist) {
1102	>	at->alist = av->next;
1103	>	(*f)(av);
1104		}
1105	<	scalecolor(acol, 1.0/ndivs);
1106	<	if (arad <= FTINY)
1107	<	arad = FHUGE;
1108	<	else
1109	<	arad = (ndivs+ns) / arad / sqrt(r->rweight);
1110	<	if (arad > maxarad)
411	<	arad = maxarad;
412	<	else if (arad < minarad)
413	<	arad = minarad;
414	<	if (ns > 0)
415	<	free((char *)div);
416	<	return(arad);
1105	>	if (at->kid == NULL)
1106	>	return;
1107	>	for (i = 0; i < 8; i++)         /* transfer and free children */
1108	>	unloadatree(at->kid+i, f);
1109	>	freeambtree(at->kid);
1110	>	at->kid = NULL;
1111		}
1112
1113
1114	+	static struct avl {
1115	+	AMBVAL  *p;
1116	+	unsigned long   t;
1117	+	}       *avlist1;                       /* ambient value list with ticks */
1118	+	static AMBVAL   **avlist2;              /* memory positions for sorting */
1119	+	static int      i_avlist;               /* index for lists */
1120	+
1121	+	static int alatcmp(const void *av1, const void *av2);
1122	+
1123	+	static void
1124	+	avfree(AMBVAL *av)
1125	+	{
1126	+	free(av);
1127	+	}
1128	+
1129	+	static void
1130	+	av2list(
1131	+	AMBVAL *av
1132	+	)
1133	+	{
1134	+	#ifdef DEBUG
1135	+	if (i_avlist >= nambvals)
1136	+	error(CONSISTENCY, "too many ambient values in av2list1");
1137	+	#endif
1138	+	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1139	+	avlist1[i_avlist++].t = av->latick;
1140	+	}
1141	+
1142	+
1143		static int
1144	<	ambcmp(d1, d2)                          /* decreasing order */
1145	<	AMBSAMP  *d1, *d2;
1144	>	alatcmp(                        /* compare ambient values for MRA */
1145	>	const void *av1,
1146	>	const void *av2
1147	>	)
1148		{
1149	<	if (d1->k < d2->k)
1150	<	return(1);
1151	<	if (d1->k > d2->k)
1149	>	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1150	>	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1151	>	}
1152	>
1153	>
1154	>	/* GW NOTE 2002/10/3:
1155	>	* I used to compare AMBVAL pointers, but found that this was the
1156	>	* cause of a serious consistency error with gcc, since the optimizer
1157	>	* uses some dangerous trick in pointer subtraction that
1158	>	* assumes pointers differ by exact struct size increments.
1159	>	*/
1160	>	static int
1161	>	aposcmp(                        /* compare ambient value positions */
1162	>	const void      *avp1,
1163	>	const void      *avp2
1164	>	)
1165	>	{
1166	>	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1167	>	if (diff < 0)
1168		return(-1);
1169	<	return(0);
1169	>	return(diff > 0);
1170		}
1171
1172
1173	<	static
1174	<	avsave(av)                              /* save an ambient value */
1175	<	AMBVAL  *av;
1173	>	static int
1174	>	avlmemi(                                /* find list position from address */
1175	>	AMBVAL  *avaddr
1176	>	)
1177		{
1178	<	#ifdef  AMBFLUSH
1179	<	static int  nunflshed = 0;
1180	<	#endif
1181	<	if (ambfp == NULL)
1178	>	AMBVAL  **avlpp;
1179	>
1180	>	avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2,
1181	>	nambvals, sizeof(AMBVAL *), &aposcmp);
1182	>	if (avlpp == NULL)
1183	>	error(CONSISTENCY, "address not found in avlmemi");
1184	>	return(avlpp - avlist2);
1185	>	}
1186	>
1187	>
1188	>	static void
1189	>	sortambvals(                    /* resort ambient values */
1190	>	int     always
1191	>	)
1192	>	{
1193	>	AMBTREE  oldatrunk;
1194	>	AMBVAL  tav, *tap, *pnext;
1195	>	int     i, j;
1196	>	/* see if it's time yet */
1197	>	if (!always && (ambclock++ < lastsort+sortintvl ||
1198	>	nambvals < SORT_THRESH))
1199		return;
1200	<	if (fwrite(av, sizeof(AMBVAL), 1, ambfp) != 1)
1201	<	goto writerr;
1202	<	#ifdef  AMBFLUSH
1203	<	if (++nunflshed >= AMBFLUSH) {
1204	<	if (fflush(ambfp) == EOF)
1205	<	goto writerr;
1206	<	nunflshed = 0;
1200	>	/*
1201	>	* The idea here is to minimize memory thrashing
1202	>	* in VM systems by improving reference locality.
1203	>	* We do this by periodically sorting our stored ambient
1204	>	* values in memory in order of most recently to least
1205	>	* recently accessed.  This ordering was chosen so that new
1206	>	* ambient values (which tend to be less important) go into
1207	>	* higher memory with the infrequently accessed values.
1208	>	*      Since we expect our values to need sorting less
1209	>	* frequently as the process continues, we double our
1210	>	* waiting interval after each call.
1211	>	*      This routine is also called by setambacc() with
1212	>	* the "always" parameter set to 1 so that the ambient
1213	>	* tree will be rebuilt with the new accuracy parameter.
1214	>	*/
1215	>	if (tracktime) {                /* allocate pointer arrays to sort */
1216	>	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1217	>	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1218	>	} else {
1219	>	avlist2 = NULL;
1220	>	avlist1 = NULL;
1221		}
1222	+	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1223	+	if (avlist2 != NULL)
1224	+	free((void *)avlist2);
1225	+	if (always) {           /* rebuild without sorting */
1226	+	oldatrunk = atrunk;
1227	+	atrunk.alist = NULL;
1228	+	atrunk.kid = NULL;
1229	+	unloadatree(&oldatrunk, &avinsert);
1230	+	}
1231	+	} else {                        /* sort memory by last access time */
1232	+	/*
1233	+	* Sorting memory is tricky because it isn't contiguous.
1234	+	* We have to sort an array of pointers by MRA and also
1235	+	* by memory position.  We then copy values in "loops"
1236	+	* to minimize memory hits.  Nevertheless, we will visit
1237	+	* everyone at least twice, and this is an expensive process
1238	+	* when we're thrashing, which is when we need to do it.
1239	+	*/
1240	+	#ifdef DEBUG
1241	+	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1242	+	nambvals, ambclock);
1243	+	eputs(errmsg);
1244		#endif
1245	<	return;
1246	<	writerr:
1247	<	error(SYSTEM, "error writing ambient file");
1245	>	i_avlist = 0;
1246	>	unloadatree(&atrunk, &av2list); /* empty current tree */
1247	>	#ifdef DEBUG
1248	>	if (i_avlist < nambvals)
1249	>	error(CONSISTENCY, "missing ambient values in sortambvals");
1250	>	#endif
1251	>	qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp);
1252	>	qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1253	>	for (i = 0; i < nambvals; i++) {
1254	>	if (avlist1[i].p == NULL)
1255	>	continue;
1256	>	tap = avlist2[i];
1257	>	tav = *tap;
1258	>	for (j = i; (pnext = avlist1[j].p) != tap;
1259	>	j = avlmemi(pnext)) {
1260	>	*(avlist2[j]) = *pnext;
1261	>	avinsert(avlist2[j]);
1262	>	avlist1[j].p = NULL;
1263	>	}
1264	>	*(avlist2[j]) = tav;
1265	>	avinsert(avlist2[j]);
1266	>	avlist1[j].p = NULL;
1267	>	}
1268	>	free((void *)avlist1);
1269	>	free((void *)avlist2);
1270	>	/* compute new sort interval */
1271	>	sortintvl = ambclock - lastsort;
1272	>	if (sortintvl >= MAX_SORT_INTVL/2)
1273	>	sortintvl = MAX_SORT_INTVL;
1274	>	else
1275	>	sortintvl <<= 1;        /* wait twice as long next */
1276	>	#ifdef DEBUG
1277	>	eputs("done\n");
1278	>	#endif
1279	>	}
1280	>	if (ambclock >= MAXACLOCK)
1281	>	ambclock = MAXACLOCK/2;
1282	>	lastsort = ambclock;
1283		}
1284
1285
1286	<	static
1287	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
1288	<	AMBVAL  *aval;
1289	<	register AMBTREE  *at;
1290	<	FVECT  c0;
1291	<	double  s;
1286	>	#ifdef  F_SETLKW
1287	>
1288	>	static void
1289	>	aflock(                 /* lock/unlock ambient file */
1290	>	int  typ
1291	>	)
1292		{
1293	<	FVECT  ck0;
464	<	int  branch;
465	<	register AMBVAL  *av;
466	<	register int  i;
1293	>	static struct flock  fls;       /* static so initialized to zeroes */
1294
1295	<	if ((av = newambval()) == NULL)
1296	<	goto memerr;
1297	<	bcopy(aval, av, sizeof(AMBVAL));
1298	<	VCOPY(ck0, c0);
1299	<	while (s*(OCTSCALE/2) > av->rad*ambacc) {
1300	<	if (at->kid == NULL)
1301	<	if ((at->kid = newambtree()) == NULL)
1302	<	goto memerr;
1303	<	s *= 0.5;
1304	<	branch = 0;
1305	<	for (i = 0; i < 3; i++)
1306	<	if (av->pos[i] > ck0[i] + s) {
1307	<	ck0[i] += s;
1308	<	branch |= 1 << i;
1295	>	if (typ == fls.l_type)          /* already called? */
1296	>	return;
1297	>	fls.l_type = typ;
1298	>	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1299	>	error(SYSTEM, "cannot (un)lock ambient file");
1300	>	}
1301	>
1302	>
1303	>	int
1304	>	ambsync(void)                   /* synchronize ambient file */
1305	>	{
1306	>	long  flen;
1307	>	AMBVAL  avs;
1308	>	int  n;
1309	>
1310	>	if (ambfp == NULL)      /* no ambient file? */
1311	>	return(0);
1312	>	/* gain appropriate access */
1313	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1314	>	/* see if file has grown */
1315	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1316	>	goto seekerr;
1317	>	if ((n = flen - lastpos) > 0) {         /* file has grown */
1318	>	if (ambinp == NULL) {           /* use duplicate filedes */
1319	>	ambinp = fdopen(dup(fileno(ambfp)), "r");
1320	>	if (ambinp == NULL)
1321	>	error(SYSTEM, "fdopen failed in ambsync");
1322	>	}
1323	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1324	>	goto seekerr;
1325	>	while (n >= AMBVALSIZ) {        /* load contributed values */
1326	>	if (!readambval(&avs, ambinp)) {
1327	>	sprintf(errmsg,
1328	>	"ambient file \"%s\" corrupted near character %ld",
1329	>	ambfile, flen - n);
1330	>	error(WARNING, errmsg);
1331	>	break;
1332		}
1333	<	at = at->kid + branch;
1333	>	avstore(&avs);
1334	>	n -= AMBVALSIZ;
1335	>	}
1336	>	lastpos = flen - n;
1337	>	/*** seek always as safety measure
1338	>	if (n) ***/                     /* alignment */
1339	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1340	>	goto seekerr;
1341		}
1342	<	av->next = at->alist;
1343	<	at->alist = av;
1344	<	return;
1345	<	memerr:
1346	<	error(SYSTEM, "out of memory in avinsert");
1342	>	n = fflush(ambfp);                      /* calls write() at last */
1343	>	if (n != EOF)
1344	>	lastpos += (long)nunflshed*AMBVALSIZ;
1345	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1346	>	goto seekerr;
1347	>
1348	>	aflock(F_UNLCK);                        /* release file */
1349	>	nunflshed = 0;
1350	>	return(n);
1351	>	seekerr:
1352	>	error(SYSTEM, "seek failed in ambsync");
1353	>	return -1; /* pro forma return */
1354		}
1355	+
1356	+	#else   /* ! F_SETLKW */
1357	+
1358	+	int
1359	+	ambsync(void)                   /* flush ambient file */
1360	+	{
1361	+	if (ambfp == NULL)
1362	+	return(0);
1363	+	nunflshed = 0;
1364	+	return(fflush(ambfp));
1365	+	}
1366	+
1367	+	#endif  /* ! F_SETLKW */

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