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

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.19 by greg, Wed Aug 4 14:22:11 1993 UTC vs.
Revision 2.105 by greg, Tue Jan 9 05:01:15 2018 UTC

#	Line 1 | Line 1
1	<	/* Copyright (c) 1993 Regents of the University of California */
2	<
3	<	#ifndef lint
4	<	static char SCCSid[] = "$SunId$ LBL";
5	<	#endif
6	<
1	>	static const char       RCSid[] = "$Id$";
2		/*
3		*  ambient.c - routines dealing with ambient (inter-reflected) component.
4	+	*
5	+	*  Declarations of external symbols in ambient.h
6		*/
7
8	<	#include  "ray.h"
8	>	#include "copyright.h"
9
10	<	#include  "octree.h"
10	>	#include <string.h>
11
12	+	#include  "platform.h"
13	+	#include  "ray.h"
14		#include  "otypes.h"
15	<
15	>	#include  "otspecial.h"
16	>	#include  "resolu.h"
17		#include  "ambient.h"
18	<
18	>	#include  "source.h"
19		#include  "random.h"
20	+	#include  "pmapamb.h"
21
22	<	#define  OCTSCALE       0.5     /* ceil((valid rad.)/(cube size)) */
22	>	#ifndef  OCTSCALE
23	>	#define  OCTSCALE       1.0     /* ceil((valid rad.)/(cube size)) */
24	>	#endif
25
26	<	typedef struct ambtree {
24	<	AMBVAL  *alist;         /* ambient value list */
25	<	struct ambtree  *kid;   /* 8 child nodes */
26	<	}  AMBTREE;                     /* ambient octree */
26	>	extern char  *shm_boundary;     /* memory sharing boundary */
27
28	<	extern CUBE  thescene;          /* contains space boundaries */
29	<
30	<	#define  MAXASET        511     /* maximum number of elements in ambient set */
28	>	#ifndef  MAXASET
29	>	#define  MAXASET        4095    /* maximum number of elements in ambient set */
30	>	#endif
31		OBJECT  ambset[MAXASET+1]={0};  /* ambient include/exclude set */
32
33		double  maxarad;                /* maximum ambient radius */
#	Line 38 | Line 38 | static AMBTREE atrunk;         /* our ambient trunk node */
38		static FILE  *ambfp = NULL;     /* ambient file pointer */
39		static int  nunflshed = 0;      /* number of unflushed ambient values */
40
41	+	#ifndef SORT_THRESH
42	+	#ifdef SMLMEM
43	+	#define SORT_THRESH     ((16L<<20)/sizeof(AMBVAL))
44	+	#else
45	+	#define SORT_THRESH     ((64L<<20)/sizeof(AMBVAL))
46	+	#endif
47	+	#endif
48	+	#ifndef SORT_INTVL
49	+	#define SORT_INTVL      (SORT_THRESH<<1)
50	+	#endif
51	+	#ifndef MAX_SORT_INTVL
52	+	#define MAX_SORT_INTVL  (SORT_INTVL<<6)
53	+	#endif
54	+
55	+
56	+	static double  avsum = 0.;              /* computed ambient value sum (log) */
57	+	static unsigned int  navsum = 0;        /* number of values in avsum */
58	+	static unsigned int  nambvals = 0;      /* total number of indirect values */
59	+	static unsigned int  nambshare = 0;     /* number of values from file */
60	+	static unsigned long  ambclock = 0;     /* ambient access clock */
61	+	static unsigned long  lastsort = 0;     /* time of last value sort */
62	+	static long  sortintvl = SORT_INTVL;    /* time until next sort */
63	+	static FILE  *ambinp = NULL;            /* auxiliary file for input */
64	+	static long  lastpos = -1;              /* last flush position */
65	+
66	+	#define MAXACLOCK       (1L<<30)        /* clock turnover value */
67	+	/*
68	+	* Track access times unless we are sharing ambient values
69	+	* through memory on a multiprocessor, when we want to avoid
70	+	* claiming our own memory (copy on write).  Go ahead anyway
71	+	* if more than two thirds of our values are unshared.
72	+	* Compile with -Dtracktime=0 to turn this code off.
73	+	*/
74	+	#ifndef tracktime
75	+	#define tracktime       (shm_boundary == NULL || nambvals > 3*nambshare)
76	+	#endif
77	+
78		#define  AMBFLUSH       (BUFSIZ/AMBVALSIZ)
79
80	<	#define  newambval()    (AMBVAL *)bmalloc(sizeof(AMBVAL))
80	>	#define  newambval()    (AMBVAL *)malloc(sizeof(AMBVAL))
81
82	<	#define  newambtree()   (AMBTREE *)calloc(8, sizeof(AMBTREE))
82	>	static void initambfile(int creat);
83	>	static void avsave(AMBVAL *av);
84	>	static AMBVAL *avstore(AMBVAL  *aval);
85	>	static AMBTREE *newambtree(void);
86	>	static void freeambtree(AMBTREE  *atp);
87
88	<	extern long  ftell(), lseek();
89	<	static int  initambfile(), avsave(), avinsert();
88	>	typedef void unloadtf_t(AMBVAL *);
89	>	static unloadtf_t avinsert;
90	>	static unloadtf_t av2list;
91	>	static unloadtf_t avfree;
92	>	static void unloadatree(AMBTREE  *at, unloadtf_t *f);
93	>
94	>	static int aposcmp(const void *avp1, const void *avp2);
95	>	static int avlmemi(AMBVAL *avaddr);
96	>	static void sortambvals(int always);
97	>
98		#ifdef  F_SETLKW
99	<	static  aflock();
99	>	static void aflock(int  typ);
100		#endif
101
102
103	<	setambres(ar)                           /* set ambient resolution */
104	<	int  ar;
103	>	void
104	>	setambres(                              /* set ambient resolution */
105	>	int  ar
106	>	)
107		{
108	+	ambres = ar < 0 ? 0 : ar;               /* may be done already */
109		/* set min & max radii */
110		if (ar <= 0) {
111	<	minarad = 0.0;
112	<	maxarad = thescene.cusize / 2.0;
111	>	minarad = 0;
112	>	maxarad = thescene.cusize*0.2;
113		} else {
114		minarad = thescene.cusize / ar;
115	<	maxarad = 16.0 * minarad;               /* heuristic */
116	<	if (maxarad > thescene.cusize / 2.0)
117	<	maxarad = thescene.cusize / 2.0;
115	>	maxarad = 64.0 * minarad;               /* heuristic */
116	>	if (maxarad > thescene.cusize*0.2)
117	>	maxarad = thescene.cusize*0.2;
118		}
119	<	if (maxarad <= FTINY)
120	<	maxarad = .001;
119	>	if (minarad <= FTINY)
120	>	minarad = 10.0*FTINY;
121	>	if (maxarad <= minarad)
122	>	maxarad = 64.0 * minarad;
123		}
124
125
126	<	setambient(afile)                       /* initialize calculation */
127	<	char  *afile;
126	>	void
127	>	setambacc(                              /* set ambient accuracy */
128	>	double  newa
129	>	)
130		{
131	<	long  headlen;
131	>	static double   olda;           /* remember previous setting here */
132	>
133	>	newa *= (newa > 0);
134	>	if (fabs(newa - olda) >= .05*(newa + olda)) {
135	>	ambacc = newa;
136	>	if (nambvals > 0)
137	>	sortambvals(1);         /* rebuild tree */
138	>	}
139	>	}
140	>
141	>
142	>	void
143	>	setambient(void)                                /* initialize calculation */
144	>	{
145	>	int     readonly = 0;
146	>	long    flen;
147		AMBVAL  amb;
148	+	/* make sure we're fresh */
149	+	ambdone();
150		/* init ambient limits */
151		setambres(ambres);
152	<	if (afile == NULL)
152	>	setambacc(ambacc);
153	>	if (ambfile == NULL || !ambfile[0])
154		return;
155	+	if (ambacc <= FTINY) {
156	+	sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
157	+	ambfile);
158	+	error(WARNING, errmsg);
159	+	return;
160	+	}
161		/* open ambient file */
162	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
163	<	initambfile(0);
164	<	headlen = ftell(ambfp);
162	>	if ((ambfp = fopen(ambfile, "r+")) == NULL)
163	>	readonly = (ambfp = fopen(ambfile, "r")) != NULL;
164	>	if (ambfp != NULL) {
165	>	initambfile(0);                 /* file exists */
166	>	lastpos = ftell(ambfp);
167		while (readambval(&amb, ambfp))
168	<	avinsert(&amb, &atrunk, thescene.cuorg,
169	<	thescene.cusize);
170	<	/* align */
171	<	fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1);
172	<	} else if ((ambfp = fopen(afile, "w+")) != NULL)
173	<	initambfile(1);
174	<	else {
175	<	sprintf(errmsg, "cannot open ambient file \"%s\"", afile);
168	>	avstore(&amb);
169	>	nambshare = nambvals;           /* share loaded values */
170	>	if (readonly) {
171	>	sprintf(errmsg,
172	>	"loaded %u values from read-only ambient file",
173	>	nambvals);
174	>	error(WARNING, errmsg);
175	>	fclose(ambfp);          /* close file so no writes */
176	>	ambfp = NULL;
177	>	return;                 /* avoid ambsync() */
178	>	}
179	>	/* align file pointer */
180	>	lastpos += (long)nambvals*AMBVALSIZ;
181	>	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
182	>	if (flen != lastpos) {
183	>	sprintf(errmsg,
184	>	"ignoring last %ld values in ambient file (corrupted)",
185	>	(flen - lastpos)/AMBVALSIZ);
186	>	error(WARNING, errmsg);
187	>	fseek(ambfp, lastpos, SEEK_SET);
188	>	ftruncate(fileno(ambfp), (off_t)lastpos);
189	>	}
190	>	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
191	>	initambfile(1);                 /* else create new file */
192	>	fflush(ambfp);
193	>	lastpos = ftell(ambfp);
194	>	} else {
195	>	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
196		error(SYSTEM, errmsg);
197		}
198	<	nunflshed++;    /* lie */
199	<	ambsync();
198	>	#ifdef  F_SETLKW
199	>	aflock(F_UNLCK);                        /* release file */
200	>	#endif
201		}
202
203
204	<	ambnotify(obj)                  /* record new modifier */
205	<	OBJECT  obj;
204	>	void
205	>	ambdone(void)                   /* close ambient file and free memory */
206		{
207	+	if (ambfp != NULL) {            /* close ambient file */
208	+	ambsync();
209	+	fclose(ambfp);
210	+	ambfp = NULL;
211	+	if (ambinp != NULL) {
212	+	fclose(ambinp);
213	+	ambinp = NULL;
214	+	}
215	+	lastpos = -1;
216	+	}
217	+	/* free ambient tree */
218	+	unloadatree(&atrunk, avfree);
219	+	/* reset state variables */
220	+	avsum = 0.;
221	+	navsum = 0;
222	+	nambvals = 0;
223	+	nambshare = 0;
224	+	ambclock = 0;
225	+	lastsort = 0;
226	+	sortintvl = SORT_INTVL;
227	+	}
228	+
229	+
230	+	void
231	+	ambnotify(                      /* record new modifier */
232	+	OBJECT  obj
233	+	)
234	+	{
235		static int  hitlimit = 0;
236	<	register OBJREC  *o = objptr(obj);
237	<	register char  **amblp;
236	>	OBJREC   *o;
237	>	char  **amblp;
238
239	+	if (obj == OVOID) {             /* starting over */
240	+	ambset[0] = 0;
241	+	hitlimit = 0;
242	+	return;
243	+	}
244	+	o = objptr(obj);
245		if (hitlimit || !ismodifier(o->otype))
246		return;
247		for (amblp = amblist; *amblp != NULL; amblp++)
#	Line 119 | Line 256 | OBJECT obj;
256		}
257		}
258
259	+	/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/
260
261	<	ambient(acol, r)                /* compute ambient component for ray */
262	<	COLOR  acol;
263	<	register RAY  *r;
261	>	#ifndef OLDAMB
262	>
263	>	#define tfunc(lwr, x, upr)      (((x)-(lwr))/((upr)-(lwr)))
264	>
265	>	static int      plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang);
266	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
267	>	AMBTREE *at, FVECT c0, double s);
268	>	static int      makeambient(COLOR acol, RAY *r, FVECT rn, int al);
269	>	static int      extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
270	>	FVECT uvw[3]);
271	>
272	>	void
273	>	multambient(            /* compute ambient component & multiply by coef. */
274	>	COLOR  aval,
275	>	RAY  *r,
276	>	FVECT  nrm
277	>	)
278		{
279		static int  rdepth = 0;                 /* ambient recursion */
280	<	double  d;
280	>	COLOR   acol, caustic;
281	>	int     i, ok;
282	>	double  d, l;
283
284	+	/* PMAP: Factor in ambient from photon map, if enabled and ray is
285	+	* ambient. Return as all ambient components accounted for, else
286	+	* continue. */
287	+	if (ambPmap(aval, r, rdepth))
288	+	return;
289	+
290	+	/* PMAP: Factor in specular-diffuse ambient (caustics) from photon
291	+	* map, if enabled and ray is primary, else caustic is zero.  Continue
292	+	* with RADIANCE ambient calculation */
293	+	copycolor(caustic, aval);
294	+	ambPmapCaustic(caustic, r, rdepth);
295	+
296		if (ambdiv <= 0)                        /* no ambient calculation */
297		goto dumbamb;
298		/* check number of bounces */
#	Line 138 | Line 304 | register RAY  *r;
304		goto dumbamb;
305
306		if (ambacc <= FTINY) {                  /* no ambient storage */
307	+	FVECT   uvd[2];
308	+	float   dgrad[2], *dgp = NULL;
309	+
310	+	if (nrm != r->ron && DOT(nrm,r->ron) < 0.9999)
311	+	dgp = dgrad;            /* compute rotational grad. */
312	+	copycolor(acol, aval);
313		rdepth++;
314	<	d = doambient(acol, r, r->rweight, NULL, NULL);
314	>	ok = doambient(acol, r, r->rweight,
315	>	uvd, NULL, NULL, dgp, NULL);
316		rdepth--;
317	<	if (d == 0.0)
317	>	if (!ok)
318		goto dumbamb;
319	+	if ((ok > 0) & (dgp != NULL)) { /* apply texture */
320	+	FVECT   v1;
321	+	VCROSS(v1, r->ron, nrm);
322	+	d = 1.0;
323	+	for (i = 3; i--; )
324	+	d += v1[i] * (dgp[0]*uvd[0][i] + dgp[1]*uvd[1][i]);
325	+	if (d >= 0.05)
326	+	scalecolor(acol, d);
327	+	}
328	+	copycolor(aval, acol);
329	+
330	+	/* PMAP: add in caustic */
331	+	addcolor(aval, caustic);
332		return;
333		}
334	<	/* get ambient value */
334	>
335	>	if (tracktime)                          /* sort to minimize thrashing */
336	>	sortambvals(0);
337	>	/* interpolate ambient value */
338		setcolor(acol, 0.0, 0.0, 0.0);
339	<	d = sumambient(acol, r, rdepth,
339	>	d = sumambient(acol, r, nrm, rdepth,
340		&atrunk, thescene.cuorg, thescene.cusize);
341	<	if (d > FTINY)
342	<	scalecolor(acol, 1.0/d);
343	<	else {
344	<	d = makeambient(acol, r, rdepth++);
341	>
342	>	if (d > FTINY) {
343	>	d = 1.0/d;
344	>	scalecolor(acol, d);
345	>	multcolor(aval, acol);
346	>
347	>	/* PMAP: add in caustic */
348	>	addcolor(aval, caustic);
349	>	return;
350	>	}
351	>
352	>	rdepth++;                               /* need to cache new value */
353	>	ok = makeambient(acol, r, nrm, rdepth-1);
354	>	rdepth--;
355	>
356	>	if (ok) {
357	>	multcolor(aval, acol);          /* computed new value */
358	>
359	>	/* PMAP: add in caustic */
360	>	addcolor(aval, caustic);
361	>	return;
362	>	}
363	>
364	>	dumbamb:                                        /* return global value */
365	>	if ((ambvwt <= 0) | (navsum == 0)) {
366	>	multcolor(aval, ambval);
367	>
368	>	/* PMAP: add in caustic */
369	>	addcolor(aval, caustic);
370	>	return;
371	>	}
372	>
373	>	l = bright(ambval);                     /* average in computations */
374	>	if (l > FTINY) {
375	>	d = (log(l)*(double)ambvwt + avsum) /
376	>	(double)(ambvwt + navsum);
377	>	d = exp(d) / l;
378	>	scalecolor(aval, d);
379	>	multcolor(aval, ambval);        /* apply color of ambval */
380	>	} else {
381	>	d = exp( avsum / (double)navsum );
382	>	scalecolor(aval, d);            /* neutral color */
383	>	}
384	>	}
385	>
386	>
387	>	/* Plug a potential leak where ambient cache value is occluded */
388	>	static int
389	>	plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang)
390	>	{
391	>	const double    cost70sq = 0.1169778;   /* cos(70deg)^2 */
392	>	RAY             rtst;
393	>	FVECT           vdif;
394	>	double          normdot, ndotd, nadotd;
395	>	double          a, b, c, t[2];
396	>
397	>	ang += 2.*PI*(ang < 0);                 /* check direction flags */
398	>	if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) )
399	>	return(0);
400	>	/*
401	>	* Generate test ray, targeting 20 degrees above sample point plane
402	>	* along surface normal from cache position.  This should be high
403	>	* enough to miss local geometry we don't really care about.
404	>	*/
405	>	VSUB(vdif, ap->pos, r->rop);
406	>	normdot = DOT(anorm, r->ron);
407	>	ndotd = DOT(vdif, r->ron);
408	>	nadotd = DOT(vdif, anorm);
409	>	a = normdot*normdot - cost70sq;
410	>	b = 2.0*(normdot*ndotd - nadotd*cost70sq);
411	>	c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq;
412	>	if (quadratic(t, a, b, c) != 2)
413	>	return(1);                      /* should rarely happen */
414	>	if (t[1] <= FTINY)
415	>	return(0);                      /* should fail behind test */
416	>	rayorigin(&rtst, SHADOW, r, NULL);
417	>	VSUM(rtst.rdir, vdif, anorm, t[1]);     /* further dist. > plane */
418	>	rtst.rmax = normalize(rtst.rdir);       /* short ray test */
419	>	while (localhit(&rtst, &thescene)) {    /* check for occluder */
420	>	OBJREC  *m = findmaterial(rtst.ro);
421	>	if (m != NULL && !istransp(m->otype) && !isBSDFproxy(m) &&
422	>	(rtst.clipset == NULL ||
423	>	!inset(rtst.clipset, rtst.ro->omod)))
424	>	return(1);              /* plug light leak */
425	>	VCOPY(rtst.rorg, rtst.rop);     /* skip invisible surface */
426	>	rtst.rmax -= rtst.rot;
427	>	rayclear(&rtst);
428	>	}
429	>	return(0);                              /* seems we're OK */
430	>	}
431	>
432	>
433	>	static double
434	>	sumambient(             /* get interpolated ambient value */
435	>	COLOR  acol,
436	>	RAY  *r,
437	>	FVECT  rn,
438	>	int  al,
439	>	AMBTREE  *at,
440	>	FVECT  c0,
441	>	double  s
442	>	)
443	>	{                       /* initial limit is 10 degrees plus ambacc radians */
444	>	const double    minangle = 10.0 * PI/180.;
445	>	double          maxangle = minangle + ambacc;
446	>	double          wsum = 0.0;
447	>	FVECT           ck0;
448	>	int             i, j;
449	>	AMBVAL          *av;
450	>
451	>	if (at->kid != NULL) {          /* sum children first */
452	>	s *= 0.5;
453	>	for (i = 0; i < 8; i++) {
454	>	for (j = 0; j < 3; j++) {
455	>	ck0[j] = c0[j];
456	>	if (1<<j & i)
457	>	ck0[j] += s;
458	>	if (r->rop[j] < ck0[j] - OCTSCALE*s)
459	>	break;
460	>	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
461	>	break;
462	>	}
463	>	if (j == 3)
464	>	wsum += sumambient(acol, r, rn, al,
465	>	at->kid+i, ck0, s);
466	>	}
467	>	/* good enough? */
468	>	if (wsum >= 0.05 && s > minarad*10.0)
469	>	return(wsum);
470	>	}
471	>	/* adjust maximum angle */
472	>	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
473	>	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
474	>	/* sum this node */
475	>	for (av = at->alist; av != NULL; av = av->next) {
476	>	double  u, v, d, delta_r2, delta_t2;
477	>	COLOR   ct;
478	>	FVECT   uvw[3];
479	>	/* record access */
480	>	if (tracktime)
481	>	av->latick = ambclock;
482	>	/*
483	>	*  Ambient level test
484	>	*/
485	>	if (av->lvl > al ||     /* list sorted, so this works */
486	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
487	>	break;
488	>	/*
489	>	*  Direction test using unperturbed normal
490	>	*/
491	>	decodedir(uvw[2], av->ndir);
492	>	d = DOT(uvw[2], r->ron);
493	>	if (d <= 0.0)           /* >= 90 degrees */
494	>	continue;
495	>	delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */
496	>	if (delta_r2 >= maxangle*maxangle)
497	>	continue;
498	>	/*
499	>	*  Modified ray behind test
500	>	*/
501	>	VSUB(ck0, r->rop, av->pos);
502	>	d = DOT(ck0, uvw[2]);
503	>	if (d < -minarad*ambacc-.001)
504	>	continue;
505	>	d /= av->rad[0];
506	>	delta_t2 = d*d;
507	>	if (delta_t2 >= ambacc*ambacc)
508	>	continue;
509	>	/*
510	>	*  Elliptical radii test based on Hessian
511	>	*/
512	>	decodedir(uvw[0], av->udir);
513	>	VCROSS(uvw[1], uvw[2], uvw[0]);
514	>	d = (u = DOT(ck0, uvw[0])) / av->rad[0];
515	>	delta_t2 += d*d;
516	>	d = (v = DOT(ck0, uvw[1])) / av->rad[1];
517	>	delta_t2 += d*d;
518	>	if (delta_t2 >= ambacc*ambacc)
519	>	continue;
520	>	/*
521	>	*  Test for potential light leak
522	>	*/
523	>	if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u)))
524	>	continue;
525	>	/*
526	>	*  Extrapolate value and compute final weight (hat function)
527	>	*/
528	>	if (!extambient(ct, av, r->rop, rn, uvw))
529	>	continue;
530	>	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
531	>	tfunc(ambacc, sqrt(delta_t2), 0.0);
532	>	scalecolor(ct, d);
533	>	addcolor(acol, ct);
534	>	wsum += d;
535	>	}
536	>	return(wsum);
537	>	}
538	>
539	>
540	>	static int
541	>	makeambient(            /* make a new ambient value for storage */
542	>	COLOR  acol,
543	>	RAY  *r,
544	>	FVECT  rn,
545	>	int  al
546	>	)
547	>	{
548	>	AMBVAL  amb;
549	>	FVECT   uvw[3];
550	>	int     i;
551	>
552	>	amb.weight = 1.0;                       /* compute weight */
553	>	for (i = al; i-- > 0; )
554	>	amb.weight *= AVGREFL;
555	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
556	>	amb.weight = 1.25*r->rweight;
557	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
558	>	/* compute ambient */
559	>	i = doambient(acol, r, amb.weight,
560	>	uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral);
561	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
562	>	if (i <= 0 || amb.rad[0] <= FTINY)      /* no Hessian or zero radius */
563	>	return(i);
564	>	/* store value */
565	>	VCOPY(amb.pos, r->rop);
566	>	amb.ndir = encodedir(r->ron);
567	>	amb.udir = encodedir(uvw[0]);
568	>	amb.lvl = al;
569	>	copycolor(amb.val, acol);
570	>	/* insert into tree */
571	>	avsave(&amb);                           /* and save to file */
572	>	if (rn != r->ron) {                     /* texture */
573	>	VCOPY(uvw[2], r->ron);
574	>	extambient(acol, &amb, r->rop, rn, uvw);
575	>	}
576	>	return(1);
577	>	}
578	>
579	>
580	>	static int
581	>	extambient(             /* extrapolate value at pv, nv */
582	>	COLOR  cr,
583	>	AMBVAL   *ap,
584	>	FVECT  pv,
585	>	FVECT  nv,
586	>	FVECT  uvw[3]
587	>	)
588	>	{
589	>	const double    min_d = 0.05;
590	>	static FVECT    my_uvw[3];
591	>	FVECT           v1;
592	>	int             i;
593	>	double          d = 1.0;        /* zeroeth order */
594	>
595	>	if (uvw == NULL) {              /* need local coordinates? */
596	>	decodedir(my_uvw[2], ap->ndir);
597	>	decodedir(my_uvw[0], ap->udir);
598	>	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
599	>	uvw = my_uvw;
600	>	}
601	>	for (i = 3; i--; )              /* gradient due to translation */
602	>	d += (pv[i] - ap->pos[i]) *
603	>	(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]);
604	>
605	>	VCROSS(v1, uvw[2], nv);         /* gradient due to rotation */
606	>	for (i = 3; i--; )
607	>	d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]);
608	>
609	>	if (d < min_d)                  /* should not use if we can avoid it */
610	>	d = min_d;
611	>	copycolor(cr, ap->val);
612	>	scalecolor(cr, d);
613	>	return(d > min_d);
614	>	}
615	>
616	>
617	>	static void
618	>	avinsert(                               /* insert ambient value in our tree */
619	>	AMBVAL *av
620	>	)
621	>	{
622	>	AMBTREE  *at;
623	>	AMBVAL  *ap;
624	>	AMBVAL  avh;
625	>	FVECT  ck0;
626	>	double  s;
627	>	int  branch;
628	>	int  i;
629	>
630	>	if (av->rad[0] <= FTINY)
631	>	error(CONSISTENCY, "zero ambient radius in avinsert");
632	>	at = &atrunk;
633	>	VCOPY(ck0, thescene.cuorg);
634	>	s = thescene.cusize;
635	>	while (s*(OCTSCALE/2) > av->rad[1]*ambacc) {
636	>	if (at->kid == NULL)
637	>	if ((at->kid = newambtree()) == NULL)
638	>	error(SYSTEM, "out of memory in avinsert");
639	>	s *= 0.5;
640	>	branch = 0;
641	>	for (i = 0; i < 3; i++)
642	>	if (av->pos[i] > ck0[i] + s) {
643	>	ck0[i] += s;
644	>	branch |= 1 << i;
645	>	}
646	>	at = at->kid + branch;
647	>	}
648	>	avh.next = at->alist;           /* order by increasing level */
649	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
650	>	if ( ap->next->lvl > av->lvl ||
651	>	(ap->next->lvl == av->lvl) &
652	>	(ap->next->weight <= av->weight) )
653	>	break;
654	>	av->next = ap->next;
655	>	ap->next = (AMBVAL*)av;
656	>	at->alist = avh.next;
657	>	}
658	>
659	>
660	>	#else /* ! NEWAMB */
661	>
662	>	static double   sumambient(COLOR acol, RAY *r, FVECT rn, int al,
663	>	AMBTREE *at, FVECT c0, double s);
664	>	static double   makeambient(COLOR acol, RAY *r, FVECT rn, int al);
665	>	static void     extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
666	>
667	>
668	>	void
669	>	multambient(            /* compute ambient component & multiply by coef. */
670	>	COLOR  aval,
671	>	RAY  *r,
672	>	FVECT  nrm
673	>	)
674	>	{
675	>	static int  rdepth = 0;                 /* ambient recursion */
676	>	COLOR   acol, caustic;
677	>	double  d, l;
678	>
679	>	/* PMAP: Factor in ambient from global photon map (if enabled) and return
680	>	* as all ambient components accounted for */
681	>	if (ambPmap(aval, r, rdepth))
682	>	return;
683	>
684	>	/* PMAP: Otherwise factor in ambient from caustic photon map
685	>	* (ambPmapCaustic() returns zero if caustic photons disabled) and
686	>	* continue with RADIANCE ambient calculation */
687	>	copycolor(caustic, aval);
688	>	ambPmapCaustic(caustic, r, rdepth);
689	>
690	>	if (ambdiv <= 0)                        /* no ambient calculation */
691	>	goto dumbamb;
692	>	/* check number of bounces */
693	>	if (rdepth >= ambounce)
694	>	goto dumbamb;
695	>	/* check ambient list */
696	>	if (ambincl != -1 && r->ro != NULL &&
697	>	ambincl != inset(ambset, r->ro->omod))
698	>	goto dumbamb;
699	>
700	>	if (ambacc <= FTINY) {                  /* no ambient storage */
701	>	copycolor(acol, aval);
702	>	rdepth++;
703	>	d = doambient(acol, r, r->rweight, NULL, NULL);
704		rdepth--;
705	+	if (d <= FTINY)
706	+	goto dumbamb;
707	+	copycolor(aval, acol);
708	+
709	+	/* PMAP: add in caustic */
710	+	addcolor(aval, caustic);
711	+	return;
712		}
713	<	if (d > FTINY)
713	>
714	>	if (tracktime)                          /* sort to minimize thrashing */
715	>	sortambvals(0);
716	>	/* interpolate ambient value */
717	>	setcolor(acol, 0.0, 0.0, 0.0);
718	>	d = sumambient(acol, r, nrm, rdepth,
719	>	&atrunk, thescene.cuorg, thescene.cusize);
720	>
721	>	if (d > FTINY) {
722	>	d = 1.0/d;
723	>	scalecolor(acol, d);
724	>	multcolor(aval, acol);
725	>
726	>	/* PMAP: add in caustic */
727	>	addcolor(aval, caustic);
728		return;
729	+	}
730	+
731	+	rdepth++;                               /* need to cache new value */
732	+	d = makeambient(acol, r, nrm, rdepth-1);
733	+	rdepth--;
734	+
735	+	if (d > FTINY) {
736	+	multcolor(aval, acol);          /* got new value */
737	+
738	+	/* PMAP: add in caustic */
739	+	addcolor(aval, caustic);
740	+	return;
741	+	}
742	+
743		dumbamb:                                        /* return global value */
744	<	copycolor(acol, ambval);
744	>	if ((ambvwt <= 0) | (navsum == 0)) {
745	>	multcolor(aval, ambval);
746	>
747	>	/* PMAP: add in caustic */
748	>	addcolor(aval, caustic);
749	>	return;
750	>	}
751	>
752	>	l = bright(ambval);                     /* average in computations */
753	>	if (l > FTINY) {
754	>	d = (log(l)*(double)ambvwt + avsum) /
755	>	(double)(ambvwt + navsum);
756	>	d = exp(d) / l;
757	>	scalecolor(aval, d);
758	>	multcolor(aval, ambval);        /* apply color of ambval */
759	>	} else {
760	>	d = exp( avsum / (double)navsum );
761	>	scalecolor(aval, d);            /* neutral color */
762	>	}
763		}
764
765
766	<	double
767	<	sumambient(acol, r, al, at, c0, s)      /* get interpolated ambient value */
768	<	COLOR  acol;
769	<	register RAY  *r;
770	<	int  al;
771	<	AMBTREE  *at;
772	<	FVECT  c0;
773	<	double  s;
766	>	static double
767	>	sumambient(     /* get interpolated ambient value */
768	>	COLOR  acol,
769	>	RAY  *r,
770	>	FVECT  rn,
771	>	int  al,
772	>	AMBTREE  *at,
773	>	FVECT  c0,
774	>	double  s
775	>	)
776		{
777		double  d, e1, e2, wt, wsum;
778		COLOR  ct;
779		FVECT  ck0;
780		int  i;
781	<	register int  j;
782	<	register AMBVAL  *av;
783	<	/* do this node */
781	>	int  j;
782	>	AMBVAL   *av;
783	>
784		wsum = 0.0;
785	+	/* do this node */
786		for (av = at->alist; av != NULL; av = av->next) {
787	+	double  rn_dot = -2.0;
788	+	if (tracktime)
789	+	av->latick = ambclock;
790		/*
791		*  Ambient level test.
792		*/
793	<	if (av->lvl > al || av->weight < r->rweight-FTINY)
794	<	continue;
793	>	if (av->lvl > al ||     /* list sorted, so this works */
794	>	(av->lvl == al) & (av->weight < 0.9*r->rweight))
795	>	break;
796		/*
797		*  Ambient radius test.
798		*/
799	<	e1 = 0.0;
800	<	for (j = 0; j < 3; j++) {
193	<	d = av->pos[j] - r->rop[j];
194	<	e1 += d * d;
195	<	}
196	<	e1 /= av->rad * av->rad;
799	>	VSUB(ck0, av->pos, r->rop);
800	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
801		if (e1 > ambacc*ambacc*1.21)
802		continue;
803		/*
804	<	*  Normal direction test.
804	>	*  Direction test using closest normal.
805		*/
806	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
807	<	if (e2 < 0.0) e2 = 0.0;
808	<	if (e1 + e2 > ambacc*ambacc*1.21)
806	>	d = DOT(av->dir, r->ron);
807	>	if (rn != r->ron) {
808	>	rn_dot = DOT(av->dir, rn);
809	>	if (rn_dot > 1.0-FTINY)
810	>	rn_dot = 1.0-FTINY;
811	>	if (rn_dot >= d-FTINY) {
812	>	d = rn_dot;
813	>	rn_dot = -2.0;
814	>	}
815	>	}
816	>	e2 = (1.0 - d) * r->rweight;
817	>	if (e2 < 0.0)
818	>	e2 = 0.0;
819	>	else if (e1 + e2 > ambacc*ambacc*1.21)
820		continue;
821		/*
822		*  Ray behind test.
#	Line 215 | Line 830 | double s;
830		/*
831		*  Jittering final test reduces image artifacts.
832		*/
833	<	wt = sqrt(e1) + sqrt(e2);
834	<	wt *= .9 + .2*urand(9015+samplendx);
835	<	if (wt > ambacc)
833	>	e1 = sqrt(e1);
834	>	e2 = sqrt(e2);
835	>	wt = e1 + e2;
836	>	if (wt > ambacc*(.9+.2*urand(9015+samplendx)))
837		continue;
838	+	/*
839	+	*  Recompute directional error using perturbed normal
840	+	*/
841	+	if (rn_dot > 0.0) {
842	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
843	+	wt = e1 + e2;
844	+	}
845		if (wt <= 1e-3)
846		wt = 1e3;
847		else
848		wt = 1.0 / wt;
849		wsum += wt;
850	<	extambient(ct, av, r->rop, r->ron);
850	>	extambient(ct, av, r->rop, rn);
851		scalecolor(ct, wt);
852		addcolor(acol, ct);
853		}
#	Line 243 | Line 866 | double s;
866		break;
867		}
868		if (j == 3)
869	<	wsum += sumambient(acol, r, al, at->kid+i, ck0, s);
869	>	wsum += sumambient(acol, r, rn, al,
870	>	at->kid+i, ck0, s);
871		}
872		return(wsum);
873		}
874
875
876	<	double
877	<	makeambient(acol, r, al)        /* make a new ambient value */
878	<	COLOR  acol;
879	<	register RAY  *r;
880	<	int  al;
876	>	static double
877	>	makeambient(            /* make a new ambient value for storage */
878	>	COLOR  acol,
879	>	RAY  *r,
880	>	FVECT  rn,
881	>	int  al
882	>	)
883		{
884		AMBVAL  amb;
885		FVECT   gp, gd;
886	<	/* compute weight */
887	<	amb.weight = pow(AVGREFL, (double)al);
888	<	if (r->rweight < 0.2*amb.weight)        /* heuristic */
889	<	amb.weight = r->rweight;
886	>	int     i;
887	>
888	>	amb.weight = 1.0;                       /* compute weight */
889	>	for (i = al; i-- > 0; )
890	>	amb.weight *= AVGREFL;
891	>	if (r->rweight < 0.1*amb.weight)        /* heuristic override */
892	>	amb.weight = 1.25*r->rweight;
893	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
894		/* compute ambient */
895		amb.rad = doambient(acol, r, amb.weight, gp, gd);
896	<	if (amb.rad == 0.0)
896	>	if (amb.rad <= FTINY) {
897	>	setcolor(acol, 0.0, 0.0, 0.0);
898		return(0.0);
899	<	/* store it */
899	>	}
900	>	scalecolor(acol, 1./AVGREFL);           /* undo assumed reflectance */
901	>	/* store value */
902		VCOPY(amb.pos, r->rop);
903		VCOPY(amb.dir, r->ron);
904		amb.lvl = al;
#	Line 274 | Line 907 | int  al;
907		VCOPY(amb.gdir, gd);
908		/* insert into tree */
909		avsave(&amb);                           /* and save to file */
910	+	if (rn != r->ron)
911	+	extambient(acol, &amb, r->rop, rn);     /* texture */
912		return(amb.rad);
913		}
914
915
916	<	extambient(cr, ap, pv, nv)              /* extrapolate value at pv, nv */
917	<	COLOR  cr;
918	<	register AMBVAL  *ap;
919	<	FVECT  pv, nv;
916	>	static void
917	>	extambient(             /* extrapolate value at pv, nv */
918	>	COLOR  cr,
919	>	AMBVAL   *ap,
920	>	FVECT  pv,
921	>	FVECT  nv
922	>	)
923		{
924	<	FVECT  v1, v2;
925	<	register int  i;
924	>	FVECT  v1;
925	>	int  i;
926		double  d;
927
928		d = 1.0;                        /* zeroeth order */
#	Line 292 | Line 930 | FVECT  pv, nv;
930		for (i = 0; i < 3; i++)
931		d += ap->gpos[i]*(pv[i]-ap->pos[i]);
932		/* gradient due to rotation */
933	<	VCOPY(v1, ap->dir);
934	<	fcross(v2, v1, nv);
297	<	d += DOT(ap->gdir, v2);
933	>	VCROSS(v1, ap->dir, nv);
934	>	d += DOT(ap->gdir, v1);
935		if (d <= 0.0) {
936		setcolor(cr, 0.0, 0.0, 0.0);
937		return;
#	Line 304 | Line 941 | FVECT  pv, nv;
941		}
942
943
944	<	static
945	<	initambfile(creat)              /* initialize ambient file */
946	<	int  creat;
944	>	static void
945	>	avinsert(                               /* insert ambient value in our tree */
946	>	AMBVAL *av
947	>	)
948		{
949	<	extern char  *progname, *octname, VersionID[];
949	>	AMBTREE  *at;
950	>	AMBVAL  *ap;
951	>	AMBVAL  avh;
952	>	FVECT  ck0;
953	>	double  s;
954	>	int  branch;
955	>	int  i;
956
957	+	if (av->rad <= FTINY)
958	+	error(CONSISTENCY, "zero ambient radius in avinsert");
959	+	at = &atrunk;
960	+	VCOPY(ck0, thescene.cuorg);
961	+	s = thescene.cusize;
962	+	while (s*(OCTSCALE/2) > av->rad*ambacc) {
963	+	if (at->kid == NULL)
964	+	if ((at->kid = newambtree()) == NULL)
965	+	error(SYSTEM, "out of memory in avinsert");
966	+	s *= 0.5;
967	+	branch = 0;
968	+	for (i = 0; i < 3; i++)
969	+	if (av->pos[i] > ck0[i] + s) {
970	+	ck0[i] += s;
971	+	branch |= 1 << i;
972	+	}
973	+	at = at->kid + branch;
974	+	}
975	+	avh.next = at->alist;           /* order by increasing level */
976	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
977	+	if ( ap->next->lvl > av->lvl ||
978	+	(ap->next->lvl == av->lvl) &
979	+	(ap->next->weight <= av->weight) )
980	+	break;
981	+	av->next = ap->next;
982	+	ap->next = (AMBVAL*)av;
983	+	at->alist = avh.next;
984	+	}
985	+
986	+	#endif  /* ! NEWAMB */
987	+
988	+	/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/
989	+
990	+	static void
991	+	initambfile(            /* initialize ambient file */
992	+	int  cre8
993	+	)
994	+	{
995	+	extern char  *progname, *octname;
996	+	static char  *mybuf = NULL;
997	+
998		#ifdef  F_SETLKW
999	<	aflock(creat ? F_WRLCK : F_RDLCK);
999	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
1000		#endif
1001	<	#ifdef MSDOS
1002	<	setmode(fileno(ambfp), O_BINARY);
1003	<	#endif
1004	<	setbuf(ambfp, bmalloc(BUFSIZ));
1005	<	if (creat) {                    /* new file */
1006	<	fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ",
1001	>	SET_FILE_BINARY(ambfp);
1002	>	if (mybuf == NULL)
1003	>	mybuf = (char *)bmalloc(BUFSIZ+8);
1004	>	setbuf(ambfp, mybuf);
1005	>	if (cre8) {                     /* new file */
1006	>	newheader("RADIANCE", ambfp);
1007	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
1008		progname, colval(ambval,RED),
1009		colval(ambval,GRN), colval(ambval,BLU),
1010	<	ambounce, ambacc);
1011	<	fprintf(ambfp, "-ad %d -as %d -ar %d %s\n",
1012	<	ambdiv, ambssamp, ambres,
1013	<	octname==NULL ? "" : octname);
1010	>	ambvwt, ambounce, ambacc);
1011	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
1012	>	ambdiv, ambssamp, ambres);
1013	>	if (octname != NULL)
1014	>	fputs(octname, ambfp);
1015	>	fputc('\n', ambfp);
1016		fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
1017	+	fputnow(ambfp);
1018		fputformat(AMBFMT, ambfp);
1019	<	putc('\n', ambfp);
1019	>	fputc('\n', ambfp);
1020		putambmagic(ambfp);
1021		} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp))
1022		error(USER, "bad ambient file");
1023		}
1024
1025
1026	<	static
1027	<	avsave(av)                              /* insert and save an ambient value */
1028	<	AMBVAL  *av;
1026	>	static void
1027	>	avsave(                         /* insert and save an ambient value */
1028	>	AMBVAL  *av
1029	>	)
1030		{
1031	<	avinsert(av, &atrunk, thescene.cuorg, thescene.cusize);
1031	>	avstore(av);
1032		if (ambfp == NULL)
1033		return;
1034		if (writambval(av, ambfp) < 0)
#	Line 348 | Line 1038 | AMBVAL *av;
1038		goto writerr;
1039		return;
1040		writerr:
1041	<	error(SYSTEM, "error writing ambient file");
1041	>	error(SYSTEM, "error writing to ambient file");
1042		}
1043
1044
1045	<	static
1046	<	avinsert(aval, at, c0, s)               /* insert ambient value in a tree */
1047	<	AMBVAL  *aval;
1048	<	register AMBTREE  *at;
359	<	FVECT  c0;
360	<	double  s;
1045	>	static AMBVAL *
1046	>	avstore(                                /* allocate memory and save aval */
1047	>	AMBVAL  *aval
1048	>	)
1049		{
1050	<	FVECT  ck0;
1051	<	int  branch;
364	<	register AMBVAL  *av;
365	<	register int  i;
1050	>	AMBVAL  *av;
1051	>	double  d;
1052
1053		if ((av = newambval()) == NULL)
1054	<	goto memerr;
1055	<	copystruct(av, aval);
1056	<	VCOPY(ck0, c0);
1057	<	while (s*(OCTSCALE/2) > av->rad*ambacc) {
1058	<	if (at->kid == NULL)
1059	<	if ((at->kid = newambtree()) == NULL)
1060	<	goto memerr;
1061	<	s *= 0.5;
1062	<	branch = 0;
1063	<	for (i = 0; i < 3; i++)
1064	<	if (av->pos[i] > ck0[i] + s) {
1065	<	ck0[i] += s;
1066	<	branch |= 1 << i;
1054	>	error(SYSTEM, "out of memory in avstore");
1055	>	*av = *aval;
1056	>	av->latick = ambclock;
1057	>	av->next = NULL;
1058	>	nambvals++;
1059	>	d = bright(av->val);
1060	>	if (d > FTINY) {                /* add to log sum for averaging */
1061	>	avsum += log(d);
1062	>	navsum++;
1063	>	}
1064	>	avinsert(av);                   /* insert in our cache tree */
1065	>	return(av);
1066	>	}
1067	>
1068	>
1069	>	#define ATALLOCSZ       512             /* #/8 trees to allocate at once */
1070	>
1071	>	static AMBTREE  *atfreelist = NULL;     /* free ambient tree structures */
1072	>
1073	>
1074	>	static AMBTREE *
1075	>	newambtree(void)                                /* allocate 8 ambient tree structs */
1076	>	{
1077	>	AMBTREE  *atp, *upperlim;
1078	>
1079	>	if (atfreelist == NULL) {       /* get more nodes */
1080	>	atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE));
1081	>	if (atfreelist == NULL)
1082	>	return(NULL);
1083	>	/* link new free list */
1084	>	upperlim = atfreelist + 8*(ATALLOCSZ-1);
1085	>	for (atp = atfreelist; atp < upperlim; atp += 8)
1086	>	atp->kid = atp + 8;
1087	>	atp->kid = NULL;
1088	>	}
1089	>	atp = atfreelist;
1090	>	atfreelist = atp->kid;
1091	>	memset(atp, 0, 8*sizeof(AMBTREE));
1092	>	return(atp);
1093	>	}
1094	>
1095	>
1096	>	static void
1097	>	freeambtree(                    /* free 8 ambient tree structs */
1098	>	AMBTREE  *atp
1099	>	)
1100	>	{
1101	>	atp->kid = atfreelist;
1102	>	atfreelist = atp;
1103	>	}
1104	>
1105	>
1106	>	static void
1107	>	unloadatree(                    /* unload an ambient value tree */
1108	>	AMBTREE  *at,
1109	>	unloadtf_t *f
1110	>	)
1111	>	{
1112	>	AMBVAL  *av;
1113	>	int  i;
1114	>	/* transfer values at this node */
1115	>	for (av = at->alist; av != NULL; av = at->alist) {
1116	>	at->alist = av->next;
1117	>	av->next = NULL;
1118	>	(*f)(av);
1119	>	}
1120	>	if (at->kid == NULL)
1121	>	return;
1122	>	for (i = 0; i < 8; i++)         /* transfer and free children */
1123	>	unloadatree(at->kid+i, f);
1124	>	freeambtree(at->kid);
1125	>	at->kid = NULL;
1126	>	}
1127	>
1128	>
1129	>	static struct avl {
1130	>	AMBVAL  *p;
1131	>	unsigned long   t;
1132	>	}       *avlist1;                       /* ambient value list with ticks */
1133	>	static AMBVAL   **avlist2;              /* memory positions for sorting */
1134	>	static int      i_avlist;               /* index for lists */
1135	>
1136	>	static int alatcmp(const void *av1, const void *av2);
1137	>
1138	>	static void
1139	>	avfree(AMBVAL *av)
1140	>	{
1141	>	free(av);
1142	>	}
1143	>
1144	>	static void
1145	>	av2list(
1146	>	AMBVAL *av
1147	>	)
1148	>	{
1149	>	#ifdef DEBUG
1150	>	if (i_avlist >= nambvals)
1151	>	error(CONSISTENCY, "too many ambient values in av2list1");
1152	>	#endif
1153	>	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1154	>	avlist1[i_avlist++].t = av->latick;
1155	>	}
1156	>
1157	>
1158	>	static int
1159	>	alatcmp(                        /* compare ambient values for MRA */
1160	>	const void *av1,
1161	>	const void *av2
1162	>	)
1163	>	{
1164	>	long  lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t;
1165	>	return(lc<0 ? -1 : lc>0 ? 1 : 0);
1166	>	}
1167	>
1168	>
1169	>	/* GW NOTE 2002/10/3:
1170	>	* I used to compare AMBVAL pointers, but found that this was the
1171	>	* cause of a serious consistency error with gcc, since the optimizer
1172	>	* uses some dangerous trick in pointer subtraction that
1173	>	* assumes pointers differ by exact struct size increments.
1174	>	*/
1175	>	static int
1176	>	aposcmp(                        /* compare ambient value positions */
1177	>	const void      *avp1,
1178	>	const void      *avp2
1179	>	)
1180	>	{
1181	>	long    diff = *(char * const *)avp1 - *(char * const *)avp2;
1182	>	if (diff < 0)
1183	>	return(-1);
1184	>	return(diff > 0);
1185	>	}
1186	>
1187	>
1188	>	static int
1189	>	avlmemi(                                /* find list position from address */
1190	>	AMBVAL  *avaddr
1191	>	)
1192	>	{
1193	>	AMBVAL  **avlpp;
1194	>
1195	>	avlpp = (AMBVAL **)bsearch(&avaddr, avlist2,
1196	>	nambvals, sizeof(AMBVAL *), aposcmp);
1197	>	if (avlpp == NULL)
1198	>	error(CONSISTENCY, "address not found in avlmemi");
1199	>	return(avlpp - avlist2);
1200	>	}
1201	>
1202	>
1203	>	static void
1204	>	sortambvals(                    /* resort ambient values */
1205	>	int     always
1206	>	)
1207	>	{
1208	>	AMBTREE  oldatrunk;
1209	>	AMBVAL  tav, *tap, *pnext;
1210	>	int     i, j;
1211	>	/* see if it's time yet */
1212	>	if (!always && (ambclock++ < lastsort+sortintvl ||
1213	>	nambvals < SORT_THRESH))
1214	>	return;
1215	>	/*
1216	>	* The idea here is to minimize memory thrashing
1217	>	* in VM systems by improving reference locality.
1218	>	* We do this by periodically sorting our stored ambient
1219	>	* values in memory in order of most recently to least
1220	>	* recently accessed.  This ordering was chosen so that new
1221	>	* ambient values (which tend to be less important) go into
1222	>	* higher memory with the infrequently accessed values.
1223	>	*      Since we expect our values to need sorting less
1224	>	* frequently as the process continues, we double our
1225	>	* waiting interval after each call.
1226	>	*      This routine is also called by setambacc() with
1227	>	* the "always" parameter set to 1 so that the ambient
1228	>	* tree will be rebuilt with the new accuracy parameter.
1229	>	*/
1230	>	if (tracktime) {                /* allocate pointer arrays to sort */
1231	>	avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *));
1232	>	avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl));
1233	>	} else {
1234	>	avlist2 = NULL;
1235	>	avlist1 = NULL;
1236	>	}
1237	>	if (avlist1 == NULL) {          /* no time tracking -- rebuild tree? */
1238	>	if (avlist2 != NULL)
1239	>	free(avlist2);
1240	>	if (always) {           /* rebuild without sorting */
1241	>	oldatrunk = atrunk;
1242	>	atrunk.alist = NULL;
1243	>	atrunk.kid = NULL;
1244	>	unloadatree(&oldatrunk, avinsert);
1245	>	}
1246	>	} else {                        /* sort memory by last access time */
1247	>	/*
1248	>	* Sorting memory is tricky because it isn't contiguous.
1249	>	* We have to sort an array of pointers by MRA and also
1250	>	* by memory position.  We then copy values in "loops"
1251	>	* to minimize memory hits.  Nevertheless, we will visit
1252	>	* everyone at least twice, and this is an expensive process
1253	>	* when we're thrashing, which is when we need to do it.
1254	>	*/
1255	>	#ifdef DEBUG
1256	>	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
1257	>	nambvals, ambclock);
1258	>	eputs(errmsg);
1259	>	#endif
1260	>	i_avlist = 0;
1261	>	unloadatree(&atrunk, av2list);  /* empty current tree */
1262	>	#ifdef DEBUG
1263	>	if (i_avlist < nambvals)
1264	>	error(CONSISTENCY, "missing ambient values in sortambvals");
1265	>	#endif
1266	>	qsort(avlist1, nambvals, sizeof(struct avl), alatcmp);
1267	>	qsort(avlist2, nambvals, sizeof(AMBVAL *), aposcmp);
1268	>	for (i = 0; i < nambvals; i++) {
1269	>	if (avlist1[i].p == NULL)
1270	>	continue;
1271	>	tap = avlist2[i];
1272	>	tav = *tap;
1273	>	for (j = i; (pnext = avlist1[j].p) != tap;
1274	>	j = avlmemi(pnext)) {
1275	>	*(avlist2[j]) = *pnext;
1276	>	avinsert(avlist2[j]);
1277	>	avlist1[j].p = NULL;
1278		}
1279	<	at = at->kid + branch;
1279	>	*(avlist2[j]) = tav;
1280	>	avinsert(avlist2[j]);
1281	>	avlist1[j].p = NULL;
1282	>	}
1283	>	free(avlist1);
1284	>	free(avlist2);
1285	>	/* compute new sort interval */
1286	>	sortintvl = ambclock - lastsort;
1287	>	if (sortintvl >= MAX_SORT_INTVL/2)
1288	>	sortintvl = MAX_SORT_INTVL;
1289	>	else
1290	>	sortintvl <<= 1;        /* wait twice as long next */
1291	>	#ifdef DEBUG
1292	>	eputs("done\n");
1293	>	#endif
1294		}
1295	<	av->next = at->alist;
1296	<	at->alist = av;
1297	<	return;
387	<	memerr:
388	<	error(SYSTEM, "out of memory in avinsert");
1295	>	if (ambclock >= MAXACLOCK)
1296	>	ambclock = MAXACLOCK/2;
1297	>	lastsort = ambclock;
1298		}
1299
1300
1301		#ifdef  F_SETLKW
1302
1303	<	static
1304	<	aflock(typ)                     /* lock/unlock ambient file */
1305	<	int  typ;
1303	>	static void
1304	>	aflock(                 /* lock/unlock ambient file */
1305	>	int  typ
1306	>	)
1307		{
1308		static struct flock  fls;       /* static so initialized to zeroes */
1309
1310	+	if (typ == fls.l_type)          /* already called? */
1311	+	return;
1312		fls.l_type = typ;
1313		if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1314		error(SYSTEM, "cannot (un)lock ambient file");
#	Line 404 | Line 1316 | int  typ;
1316
1317
1318		int
1319	<	ambsync()                       /* synchronize ambient file */
1319	>	ambsync(void)                   /* synchronize ambient file */
1320		{
409	–	static FILE  *ambinp = NULL;
410	–	static long  lastpos = -1;
1321		long  flen;
1322		AMBVAL  avs;
1323	<	register int  n;
1323	>	int  n;
1324
1325	<	if (nunflshed == 0)
1325	>	if (ambfp == NULL)      /* no ambient file? */
1326		return(0);
1327	<	if (lastpos < 0)        /* initializing (locked in initambfile) */
1328	<	goto syncend;
419	<	/* gain exclusive access */
420	<	aflock(F_WRLCK);
1327	>	/* gain appropriate access */
1328	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1329		/* see if file has grown */
1330	<	if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0)
1331	<	error(SYSTEM, "cannot seek on ambient file");
1332	<	if (n = flen - lastpos) {               /* file has grown */
1333	<	if (ambinp == NULL) {           /* use duplicate filedes */
1334	<	ambinp = fdopen(dup(fileno(ambfp)), "r");
1330	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1331	>	goto seekerr;
1332	>	if ((n = flen - lastpos) > 0) {         /* file has grown */
1333	>	if (ambinp == NULL) {           /* get new file pointer */
1334	>	ambinp = fopen(ambfile, "rb");
1335		if (ambinp == NULL)
1336	<	error(SYSTEM, "fdopen failed in ambsync");
1336	>	error(SYSTEM, "fopen failed in ambsync");
1337		}
1338	<	if (fseek(ambinp, lastpos, 0) < 0)
1339	<	error(SYSTEM, "fseek failed in ambsync");
1338	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1339	>	goto seekerr;
1340		while (n >= AMBVALSIZ) {        /* load contributed values */
1341	<	readambval(&avs, ambinp);
1342	<	avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize);
1341	>	if (!readambval(&avs, ambinp)) {
1342	>	sprintf(errmsg,
1343	>	"ambient file \"%s\" corrupted near character %ld",
1344	>	ambfile, flen - n);
1345	>	error(WARNING, errmsg);
1346	>	break;
1347	>	}
1348	>	avstore(&avs);
1349		n -= AMBVALSIZ;
1350		}
1351	<	if (n)                          /* alignment */
1352	<	lseek(fileno(ambfp), flen-n, 0);
1351	>	lastpos = flen - n;             /* check alignment */
1352	>	if (n && lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1353	>	goto seekerr;
1354		}
440	–	syncend:
1355		n = fflush(ambfp);                      /* calls write() at last */
1356	<	lastpos = lseek(fileno(ambfp), 0L, 1);
1356	>	lastpos += (long)nunflshed*AMBVALSIZ;
1357		aflock(F_UNLCK);                        /* release file */
1358		nunflshed = 0;
1359		return(n);
1360	+	seekerr:
1361	+	error(SYSTEM, "seek failed in ambsync");
1362	+	return(EOF);    /* pro forma return */
1363		}
1364
1365	<	#else
1365	>	#else   /* ! F_SETLKW */
1366
1367		int
1368	<	ambsync()                       /* flush ambient file */
1368	>	ambsync(void)                   /* flush ambient file */
1369		{
1370	<	if (nunflshed == 0)
1370	>	if (ambfp == NULL)
1371		return(0);
1372		nunflshed = 0;
1373		return(fflush(ambfp));
1374		}
1375
1376	<	#endif
1376	>	#endif  /* ! F_SETLKW */

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