[ViewVC] Diff of: radiance/ray/src/rt/ambient.c

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.15 by greg, Wed Jan 20 10:48:23 1993 UTC vs.
Revision 2.68 by greg, Thu Oct 14 05:54:44 2010 UTC

#	Line 1 \| Line 1
1	–	/* Copyright (c) 1993 Regents of the University of California */
2	–
1		#ifndef lint
2	<	static char SCCSid[] = "$SunId$ LBL";
2	>	static const char RCSid[] = "$Id$";
3		#endif
6	–
4		/*
5		* ambient.c - routines dealing with ambient (inter-reflected) component.
6	+	*
7	+	* Declarations of external symbols in ambient.h
8		*/
9
10	<	#include "ray.h"
10	>	#include "copyright.h"
11
12	<	#include "octree.h"
12	>	#include <string.h>
13
14	+	#include "platform.h"
15	+	#include "ray.h"
16		#include "otypes.h"
17	<
17	>	#include "resolu.h"
18		#include "ambient.h"
18	–
19		#include "random.h"
20
21	<	#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */
21	>	#ifndef OCTSCALE
22	>	#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */
23	>	#endif
24
25	<	typedef struct ambtree {
24	<	AMBVAL alist; / ambient value list */
25	<	struct ambtree kid; / 8 child nodes */
26	<	} AMBTREE; /* ambient octree */
25	>	extern char shm_boundary; / memory sharing boundary */
26
27	<	extern CUBE thescene; /* contains space boundaries */
28	<
29	<	#define MAXASET 511 /* maximum number of elements in ambient set */
27	>	#ifndef MAXASET
28	>	#define MAXASET 4095 /* maximum number of elements in ambient set */
29	>	#endif
30		OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */
31
32		double maxarad; /* maximum ambient radius */
#	Line 35 \| Line 34 \| *double minarad; / minimum ambient radius /*
34
35		static AMBTREE atrunk; /* our ambient trunk node */
36
38	–	static char ambfname = NULL; / ambient file name */
37		static FILE ambfp = NULL; / ambient file pointer */
38	+	static int nunflshed = 0; /* number of unflushed ambient values */
39
40	+	#ifndef SORT_THRESH
41	+	#ifdef SMLMEM
42	+	#define SORT_THRESH ((3L<<20)/sizeof(AMBVAL))
43	+	#else
44	+	#define SORT_THRESH ((9L<<20)/sizeof(AMBVAL))
45	+	#endif
46	+	#endif
47	+	#ifndef SORT_INTVL
48	+	#define SORT_INTVL (SORT_THRESH<<1)
49	+	#endif
50	+	#ifndef MAX_SORT_INTVL
51	+	#define MAX_SORT_INTVL (SORT_INTVL<<6)
52	+	#endif
53	+
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	+	#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 AMBFLUSH (BUFSIZ/AMBVALSIZ)
77
78	<	#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL))
78	>	#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL))
79	>	#define freeav(av) free((void *)av);
80
81	<	#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE))
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	<	extern long ftell(), lseek();
88	<	static int initambfile(), avsave(), avinsert(), ambsync();
87	>	typedef void unloadtf_t(void *);
88	>	static unloadtf_t avinsert;
89	>	static unloadtf_t av2list;
90	>	static void unloadatree(AMBTREE at, unloadtf_t f);
91
92	+	static int aposcmp(const void avp1, const void avp2);
93	+	static int avlmemi(AMBVAL *avaddr);
94	+	static void sortambvals(int always);
95
96	<	setambres(ar) /* set ambient resolution */
97	<	int ar;
96	>	#ifdef F_SETLKW
97	>	static void aflock(int typ);
98	>	#endif
99	>
100	>
101	>	extern void
102	>	setambres( /* set ambient resolution */
103	>	int ar
104	>	)
105		{
106	+	ambres = ar < 0 ? 0 : ar; /* may be done already */
107		/* set min & max radii */
108		if (ar <= 0) {
109	<	minarad = 0.0;
109	>	minarad = 0;
110		maxarad = thescene.cusize / 2.0;
111		} else {
112		minarad = thescene.cusize / ar;
113	<	maxarad = 16.0 * minarad; /* heuristic */
113	>	maxarad = 64 * minarad; /* heuristic */
114		if (maxarad > thescene.cusize / 2.0)
115		maxarad = thescene.cusize / 2.0;
116		}
117	<	if (maxarad <= FTINY)
118	<	maxarad = .001;
117	>	if (minarad <= FTINY)
118	>	minarad = 10*FTINY;
119	>	if (maxarad <= minarad)
120	>	maxarad = 64 * minarad;
121		}
122
123
124	<	setambient(afile) /* initialize calculation */
125	<	char *afile;
124	>	extern void
125	>	setambacc( /* set ambient accuracy */
126	>	double newa
127	>	)
128		{
129	<	long headlen;
129	>	double ambdiff;
130	>
131	>	if (newa < 0.0)
132	>	newa = 0.0;
133	>	ambdiff = fabs(newa - ambacc);
134	>	if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0)
135	>	sortambvals(1); /* rebuild tree */
136	>	}
137	>
138	>
139	>	extern void
140	>	setambient(void) /* initialize calculation */
141	>	{
142	>	int readonly = 0;
143	>	long flen;
144		AMBVAL amb;
145	+	/* make sure we're fresh */
146	+	ambdone();
147		/* init ambient limits */
148		setambres(ambres);
149	+	setambacc(ambacc);
150	+	if (ambfile == NULL \|\| !ambfile[0])
151	+	return;
152	+	if (ambacc <= FTINY) {
153	+	sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
154	+	ambfile);
155	+	error(WARNING, errmsg);
156	+	return;
157	+	}
158		/* open ambient file */
159	<	if ((ambfname = afile) != NULL)
160	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
161	<	initambfile(0);
162	<	headlen = ftell(ambfp);
163	<	while (readambval(&amb, ambfp))
164	<	avinsert(&amb, &atrunk, thescene.cuorg,
165	<	thescene.cusize);
166	<	/* align */
167	<	fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1);
168	<	} else if ((ambfp = fopen(afile, "w+")) != NULL)
169	<	initambfile(1);
170	<	else {
171	<	sprintf(errmsg, "cannot open ambient file \"%s\"",
172	<	afile);
173	<	error(SYSTEM, errmsg);
159	>	if ((ambfp = fopen(ambfile, "r+")) == NULL)
160	>	readonly = (ambfp = fopen(ambfile, "r")) != NULL;
161	>	if (ambfp != NULL) {
162	>	initambfile(0); /* file exists */
163	>	lastpos = ftell(ambfp);
164	>	while (readambval(&amb, ambfp))
165	>	avinsert(avstore(&amb));
166	>	nambshare = nambvals; /* share loaded values */
167	>	if (readonly) {
168	>	sprintf(errmsg,
169	>	"loaded %u values from read-only ambient file",
170	>	nambvals);
171	>	error(WARNING, errmsg);
172	>	fclose(ambfp); /* close file so no writes */
173	>	ambfp = NULL;
174	>	return; /* avoid ambsync() */
175		}
176	+	/* align file pointer */
177	+	lastpos += (long)nambvals*AMBVALSIZ;
178	+	flen = lseek(fileno(ambfp), (off_t)0, SEEK_END);
179	+	if (flen != lastpos) {
180	+	sprintf(errmsg,
181	+	"ignoring last %ld values in ambient file (corrupted)",
182	+	(flen - lastpos)/AMBVALSIZ);
183	+	error(WARNING, errmsg);
184	+	fseek(ambfp, lastpos, SEEK_SET);
185	+	#ifndef _WIN32 /* XXX we need a replacement for that one */
186	+	ftruncate(fileno(ambfp), (off_t)lastpos);
187	+	#endif
188	+	}
189	+	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
190	+	initambfile(1); /* else create new file */
191	+	fflush(ambfp);
192	+	lastpos = ftell(ambfp);
193	+	} else {
194	+	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
195	+	error(SYSTEM, errmsg);
196	+	}
197	+	#ifdef F_SETLKW
198	+	aflock(F_UNLCK); /* release file */
199	+	#endif
200		}
201
202
203	<	ambnotify(obj) /* record new modifier */
204	<	OBJECT obj;
203	>	extern void
204	>	ambdone(void) /* close ambient file and free memory */
205		{
206	+	if (ambfp != NULL) { /* close ambient file */
207	+	ambsync();
208	+	fclose(ambfp);
209	+	ambfp = NULL;
210	+	if (ambinp != NULL) {
211	+	fclose(ambinp);
212	+	ambinp = NULL;
213	+	}
214	+	lastpos = -1;
215	+	}
216	+	/* free ambient tree */
217	+	unloadatree(&atrunk, free);
218	+	/* reset state variables */
219	+	avsum = 0.;
220	+	navsum = 0;
221	+	nambvals = 0;
222	+	nambshare = 0;
223	+	ambclock = 0;
224	+	lastsort = 0;
225	+	sortintvl = SORT_INTVL;
226	+	}
227	+
228	+
229	+	extern void
230	+	ambnotify( /* record new modifier */
231	+	OBJECT obj
232	+	)
233	+	{
234		static int hitlimit = 0;
235	<	register OBJREC *o = objptr(obj);
235	>	register OBJREC *o;
236		register char **amblp;
237
238	+	if (obj == OVOID) { /* starting over */
239	+	ambset[0] = 0;
240	+	hitlimit = 0;
241	+	return;
242	+	}
243	+	o = objptr(obj);
244		if (hitlimit \|\| !ismodifier(o->otype))
245		return;
246		for (amblp = amblist; *amblp != NULL; amblp++)
#	Line 115 \| Line 256 \| OBJECT obj;
256		}
257
258
259	<	ambient(acol, r) /* compute ambient component for ray */
260	<	COLOR acol;
261	<	register RAY *r;
259	>	extern void
260	>	multambient( /* compute ambient component & multiply by coef. */
261	>	COLOR aval,
262	>	register RAY *r,
263	>	FVECT nrm
264	>	)
265		{
266		static int rdepth = 0; /* ambient recursion */
267	<	double d;
267	>	COLOR acol;
268	>	double d, l;
269
270		if (ambdiv <= 0) /* no ambient calculation */
271		goto dumbamb;
#	Line 133 \| Line 278 \| *register RAY r;**
278		goto dumbamb;
279
280		if (ambacc <= FTINY) { /* no ambient storage */
281	+	copycolor(acol, aval);
282		rdepth++;
283		d = doambient(acol, r, r->rweight, NULL, NULL);
284		rdepth--;
285	<	if (d == 0.0)
285	>	if (d <= FTINY)
286		goto dumbamb;
287	+	copycolor(aval, acol);
288		return;
289		}
290	<	/* get ambient value */
290	>
291	>	if (tracktime) /* sort to minimize thrashing */
292	>	sortambvals(0);
293	>	/* interpolate ambient value */
294		setcolor(acol, 0.0, 0.0, 0.0);
295	<	d = sumambient(acol, r, rdepth,
295	>	d = sumambient(acol, r, nrm, rdepth,
296		&atrunk, thescene.cuorg, thescene.cusize);
297	<	if (d > FTINY)
298	<	scalecolor(acol, 1.0/d);
299	<	else {
300	<	d = makeambient(acol, r, rdepth++);
301	<	rdepth--;
297	>	if (d > FTINY) {
298	>	d = 1.0/d;
299	>	scalecolor(acol, d);
300	>	multcolor(aval, acol);
301	>	return;
302		}
303	<	if (d > FTINY)
303	>	rdepth++; /* need to cache new value */
304	>	d = makeambient(acol, r, nrm, rdepth-1);
305	>	rdepth--;
306	>	if (d > FTINY) {
307	>	multcolor(aval, acol); /* got new value */
308		return;
309	+	}
310		dumbamb: /* return global value */
311	<	copycolor(acol, ambval);
311	>	if ((ambvwt <= 0) \| (navsum == 0)) {
312	>	multcolor(aval, ambval);
313	>	return;
314	>	}
315	>	l = bright(ambval); /* average in computations */
316	>	if (l > FTINY) {
317	>	d = (log(l)*(double)ambvwt + avsum) /
318	>	(double)(ambvwt + navsum);
319	>	d = exp(d) / l;
320	>	scalecolor(aval, d);
321	>	multcolor(aval, ambval); /* apply color of ambval */
322	>	} else {
323	>	d = exp( avsum / (double)navsum );
324	>	scalecolor(aval, d); /* neutral color */
325	>	}
326		}
327
328
329	<	double
330	<	sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */
331	<	COLOR acol;
332	<	register RAY *r;
333	<	int al;
334	<	AMBTREE *at;
335	<	FVECT c0;
336	<	double s;
329	>	extern double
330	>	sumambient( /* get interpolated ambient value */
331	>	COLOR acol,
332	>	register RAY *r,
333	>	FVECT rn,
334	>	int al,
335	>	AMBTREE *at,
336	>	FVECT c0,
337	>	double s
338	>	)
339		{
340		double d, e1, e2, wt, wsum;
341		COLOR ct;
#	Line 172 \| Line 343 \| double s;
343		int i;
344		register int j;
345		register AMBVAL *av;
346	<	/* do this node */
346	>
347		wsum = 0.0;
348	+	/* do this node */
349		for (av = at->alist; av != NULL; av = av->next) {
350	+	double rn_dot = -2.0;
351	+	if (tracktime)
352	+	av->latick = ambclock;
353		/*
354		* Ambient level test.
355		*/
356	<	if (av->lvl > al \|\| av->weight < r->rweight-FTINY)
356	>	if (av->lvl > al) /* list sorted, so this works */
357	>	break;
358	>	if (av->weight < 0.9*r->rweight)
359		continue;
360		/*
361		* Ambient radius test.
362		*/
363	<	e1 = 0.0;
364	<	for (j = 0; j < 3; j++) {
365	<	d = av->pos[j] - r->rop[j];
366	<	e1 += d * d;
367	<	}
363	>	d = av->pos[0] - r->rop[0];
364	>	e1 = d * d;
365	>	d = av->pos[1] - r->rop[1];
366	>	e1 += d * d;
367	>	d = av->pos[2] - r->rop[2];
368	>	e1 += d * d;
369		e1 /= av->rad * av->rad;
370		if (e1 > ambaccambacc1.21)
371		continue;
372		/*
373	<	* Normal direction test.
373	>	* Direction test using closest normal.
374		*/
375	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
375	>	d = DOT(av->dir, r->ron);
376	>	if (rn != r->ron) {
377	>	rn_dot = DOT(av->dir, rn);
378	>	if (rn_dot > 1.0-FTINY)
379	>	rn_dot = 1.0-FTINY;
380	>	if (rn_dot >= d-FTINY) {
381	>	d = rn_dot;
382	>	rn_dot = -2.0;
383	>	}
384	>	}
385	>	e2 = (1.0 - d) * r->rweight;
386		if (e2 < 0.0) e2 = 0.0;
387		if (e1 + e2 > ambaccambacc1.21)
388		continue;
#	Line 210 \| Line 398 \| double s;
398		/*
399		* Jittering final test reduces image artifacts.
400		*/
401	<	wt = sqrt(e1) + sqrt(e2);
402	<	wt = .9 + .2urand(9015+samplendx);
403	<	if (wt > ambacc)
401	>	e1 = sqrt(e1);
402	>	e2 = sqrt(e2);
403	>	wt = e1 + e2;
404	>	if (wt > ambacc(.9+.2urand(9015+samplendx)))
405		continue;
406	+	/*
407	+	* Recompute directional error using perturbed normal
408	+	*/
409	+	if (rn_dot > 0.0) {
410	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
411	+	wt = e1 + e2;
412	+	}
413		if (wt <= 1e-3)
414		wt = 1e3;
415		else
416		wt = 1.0 / wt;
417		wsum += wt;
418	<	extambient(ct, av, r->rop, r->ron);
418	>	extambient(ct, av, r->rop, rn);
419		scalecolor(ct, wt);
420		addcolor(acol, ct);
421		}
#	Line 238 \| Line 434 \| double s;
434		break;
435		}
436		if (j == 3)
437	<	wsum += sumambient(acol, r, al, at->kid+i, ck0, s);
437	>	wsum += sumambient(acol, r, rn, al,
438	>	at->kid+i, ck0, s);
439		}
440		return(wsum);
441		}
442
443
444	<	double
445	<	makeambient(acol, r, al) /* make a new ambient value */
446	<	COLOR acol;
447	<	register RAY *r;
448	<	int al;
444	>	extern double
445	>	makeambient( /* make a new ambient value for storage */
446	>	COLOR acol,
447	>	RAY *r,
448	>	FVECT rn,
449	>	int al
450	>	)
451		{
452		AMBVAL amb;
453		FVECT gp, gd;
454	<	/* compute weight */
455	<	amb.weight = pow(AVGREFL, (double)al);
456	<	if (r->rweight < 0.2amb.weight) / heuristic */
457	<	amb.weight = r->rweight;
454	>	int i;
455	>
456	>	amb.weight = 1.0; /* compute weight */
457	>	for (i = al; i-- > 0; )
458	>	amb.weight *= AVGREFL;
459	>	if (r->rweight < 0.1amb.weight) / heuristic override */
460	>	amb.weight = 1.25*r->rweight;
461	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
462		/* compute ambient */
463		amb.rad = doambient(acol, r, amb.weight, gp, gd);
464	<	if (amb.rad == 0.0)
464	>	if (amb.rad <= FTINY) {
465	>	setcolor(acol, 0.0, 0.0, 0.0);
466		return(0.0);
467	<	/* store it */
467	>	}
468	>	scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */
469	>	/* store value */
470		VCOPY(amb.pos, r->rop);
471		VCOPY(amb.dir, r->ron);
472		amb.lvl = al;
#	Line 269 \| Line 475 \| int al;
475		VCOPY(amb.gdir, gd);
476		/* insert into tree */
477		avsave(&amb); /* and save to file */
478	+	if (rn != r->ron)
479	+	extambient(acol, &amb, r->rop, rn); /* texture */
480		return(amb.rad);
481		}
482
483
484	<	extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */
485	<	COLOR cr;
486	<	register AMBVAL *ap;
487	<	FVECT pv, nv;
484	>	extern void
485	>	extambient( /* extrapolate value at pv, nv */
486	>	COLOR cr,
487	>	register AMBVAL *ap,
488	>	FVECT pv,
489	>	FVECT nv
490	>	)
491		{
492	<	FVECT v1, v2;
492	>	FVECT v1;
493		register int i;
494		double d;
495
#	Line 287 \| Line 498 \| FVECT pv, nv;
498		for (i = 0; i < 3; i++)
499		d += ap->gpos[i]*(pv[i]-ap->pos[i]);
500		/* gradient due to rotation */
501	<	VCOPY(v1, ap->dir);
502	<	fcross(v2, v1, nv);
292	<	d += DOT(ap->gdir, v2);
501	>	VCROSS(v1, ap->dir, nv);
502	>	d += DOT(ap->gdir, v1);
503		if (d <= 0.0) {
504		setcolor(cr, 0.0, 0.0, 0.0);
505		return;
#	Line 299 \| Line 509 \| FVECT pv, nv;
509		}
510
511
512	<	static
513	<	initambfile(creat) /* initialize ambient file */
514	<	int creat;
512	>	static void
513	>	initambfile( /* initialize ambient file */
514	>	int cre8
515	>	)
516		{
517	<	extern char progname, octname, VersionID[];
517	>	extern char progname, octname;
518	>	static char *mybuf = NULL;
519
520	<	#ifdef MSDOS
521	<	setmode(fileno(ambfp), O_BINARY);
520	>	#ifdef F_SETLKW
521	>	aflock(creat ? F_WRLCK : F_RDLCK);
522		#endif
523	<	setbuf(ambfp, bmalloc(BUFSIZ));
524	<	if (creat) { /* new file */
525	<	fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ",
523	>	SET_FILE_BINARY(ambfp);
524	>	if (mybuf == NULL)
525	>	mybuf = (char *)bmalloc(BUFSIZ+8);
526	>	setbuf(ambfp, mybuf);
527	>	if (cre8) { /* new file */
528	>	newheader("RADIANCE", ambfp);
529	>	fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
530		progname, colval(ambval,RED),
531		colval(ambval,GRN), colval(ambval,BLU),
532	<	ambounce, ambacc);
533	<	fprintf(ambfp, "-ad %d -as %d -ar %d %s\n",
534	<	ambdiv, ambssamp, ambres,
535	<	octname==NULL ? "" : octname);
532	>	ambvwt, ambounce, ambacc);
533	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
534	>	ambdiv, ambssamp, ambres);
535	>	if (octname != NULL)
536	>	fputs(octname, ambfp);
537	>	fputc('\n', ambfp);
538		fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
539	+	fputnow(ambfp);
540		fputformat(AMBFMT, ambfp);
541	<	putc('\n', ambfp);
541	>	fputc('\n', ambfp);
542		putambmagic(ambfp);
543		} else if (checkheader(ambfp, AMBFMT, NULL) < 0 \|\| !hasambmagic(ambfp))
544		error(USER, "bad ambient file");
326	–	ambsync();
545		}
546
547
548	<	static
549	<	avsave(av) /* insert and save an ambient value */
550	<	AMBVAL *av;
548	>	static void
549	>	avsave( /* insert and save an ambient value */
550	>	AMBVAL *av
551	>	)
552		{
553	<	static int nunflshed = 0;
335	<
336	<	avinsert(av, &atrunk, thescene.cuorg, thescene.cusize);
553	>	avinsert(avstore(av));
554		if (ambfp == NULL)
555		return;
556		if (writambval(av, ambfp) < 0)
557		goto writerr;
558	<	if (++nunflshed >= AMBFLUSH) {
558	>	if (++nunflshed >= AMBFLUSH)
559		if (ambsync() == EOF)
560		goto writerr;
344	–	nunflshed = 0;
345	–	}
561		return;
562		writerr:
563	<	error(SYSTEM, "error writing ambient file");
563	>	error(SYSTEM, "error writing to ambient file");
564		}
565
566
567	<	static
568	<	avinsert(aval, at, c0, s) /* insert ambient value in a tree */
569	<	AMBVAL *aval;
570	<	register AMBTREE *at;
356	<	FVECT c0;
357	<	double s;
567	>	static AMBVAL *
568	>	avstore( /* allocate memory and store aval */
569	>	register AMBVAL *aval
570	>	)
571		{
572	+	register AMBVAL *av;
573	+	double d;
574	+
575	+	if ((av = newambval()) == NULL)
576	+	error(SYSTEM, "out of memory in avstore");
577	+	av = aval;
578	+	av->latick = ambclock;
579	+	av->next = NULL;
580	+	nambvals++;
581	+	d = bright(av->val);
582	+	if (d > FTINY) { /* add to log sum for averaging */
583	+	avsum += log(d);
584	+	navsum++;
585	+	}
586	+	return(av);
587	+	}
588	+
589	+
590	+	#define ATALLOCSZ 512 /* #/8 trees to allocate at once */
591	+
592	+	static AMBTREE atfreelist = NULL; / free ambient tree structures */
593	+
594	+
595	+	static AMBTREE *
596	+	newambtree(void) /* allocate 8 ambient tree structs */
597	+	{
598	+	register AMBTREE atp, upperlim;
599	+
600	+	if (atfreelist == NULL) { /* get more nodes */
601	+	atfreelist = (AMBTREE )malloc(ATALLOCSZ8*sizeof(AMBTREE));
602	+	if (atfreelist == NULL)
603	+	return(NULL);
604	+	/* link new free list */
605	+	upperlim = atfreelist + 8*(ATALLOCSZ-1);
606	+	for (atp = atfreelist; atp < upperlim; atp += 8)
607	+	atp->kid = atp + 8;
608	+	atp->kid = NULL;
609	+	}
610	+	atp = atfreelist;
611	+	atfreelist = atp->kid;
612	+	memset((char )atp, '\0', 8sizeof(AMBTREE));
613	+	return(atp);
614	+	}
615	+
616	+
617	+	static void
618	+	freeambtree( /* free 8 ambient tree structs */
619	+	AMBTREE *atp
620	+	)
621	+	{
622	+	atp->kid = atfreelist;
623	+	atfreelist = atp;
624	+	}
625	+
626	+
627	+	static void
628	+	avinsert( /* insert ambient value in our tree */
629	+	void *av
630	+	)
631	+	{
632	+	register AMBTREE *at;
633	+	register AMBVAL *ap;
634	+	AMBVAL avh;
635		FVECT ck0;
636	+	double s;
637		int branch;
361	–	register AMBVAL *av;
638		register int i;
639
640	<	if ((av = newambval()) == NULL)
641	<	goto memerr;
642	<	copystruct(av, aval);
643	<	VCOPY(ck0, c0);
644	<	while (s(OCTSCALE/2) > av->radambacc) {
640	>	if (((AMBVAL*)av)->rad <= FTINY)
641	>	error(CONSISTENCY, "zero ambient radius in avinsert");
642	>	at = &atrunk;
643	>	VCOPY(ck0, thescene.cuorg);
644	>	s = thescene.cusize;
645	>	while (s(OCTSCALE/2) > ((AMBVAL)av)->rad*ambacc) {
646		if (at->kid == NULL)
647		if ((at->kid = newambtree()) == NULL)
648	<	goto memerr;
648	>	error(SYSTEM, "out of memory in avinsert");
649		s *= 0.5;
650		branch = 0;
651		for (i = 0; i < 3; i++)
652	<	if (av->pos[i] > ck0[i] + s) {
652	>	if (((AMBVAL*)av)->pos[i] > ck0[i] + s) {
653		ck0[i] += s;
654		branch \|= 1 << i;
655		}
656		at = at->kid + branch;
657		}
658	<	av->next = at->alist;
659	<	at->alist = av;
660	<	return;
661	<	memerr:
662	<	error(SYSTEM, "out of memory in avinsert");
658	>	avh.next = at->alist; /* order by increasing level */
659	>	for (ap = &avh; ap->next != NULL; ap = ap->next)
660	>	if (ap->next->lvl >= ((AMBVAL*)av)->lvl)
661	>	break;
662	>	((AMBVAL*)av)->next = ap->next;
663	>	ap->next = (AMBVAL*)av;
664	>	at->alist = avh.next;
665		}
666
667
668	<	#ifdef NIX
668	>	static void
669	>	unloadatree( /* unload an ambient value tree */
670	>	register AMBTREE *at,
671	>	unloadtf_t *f
672	>	)
673	>	{
674	>	register AMBVAL *av;
675	>	register int i;
676	>	/* transfer values at this node */
677	>	for (av = at->alist; av != NULL; av = at->alist) {
678	>	at->alist = av->next;
679	>	(*f)(av);
680	>	}
681	>	if (at->kid == NULL)
682	>	return;
683	>	for (i = 0; i < 8; i++) /* transfer and free children */
684	>	unloadatree(at->kid+i, f);
685	>	freeambtree(at->kid);
686	>	at->kid = NULL;
687	>	}
688
689	<	static
690	<	ambsync() /* flush ambient file */
689	>
690	>	static struct avl {
691	>	AMBVAL *p;
692	>	unsigned long t;
693	>	} avlist1; / ambient value list with ticks */
694	>	static AMBVAL *avlist2; / memory positions for sorting */
695	>	static int i_avlist; /* index for lists */
696	>
697	>	static int alatcmp(const void av1, const void av2);
698	>
699	>	static void
700	>	av2list(
701	>	void *av
702	>	)
703		{
704	<	return(fflush(ambfp));
704	>	#ifdef DEBUG
705	>	if (i_avlist >= nambvals)
706	>	error(CONSISTENCY, "too many ambient values in av2list1");
707	>	#endif
708	>	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
709	>	avlist1[i_avlist++].t = ((AMBVAL*)av)->latick;
710		}
711
712	+
713	+	static int
714	+	alatcmp( /* compare ambient values for MRA */
715	+	const void *av1,
716	+	const void *av2
717	+	)
718	+	{
719	+	register long lc = ((struct avl )av2)->t - ((struct avl )av1)->t;
720	+	return(lc<0 ? -1 : lc>0 ? 1 : 0);
721	+	}
722	+
723	+
724	+	/* GW NOTE 2002/10/3:
725	+	* I used to compare AMBVAL pointers, but found that this was the
726	+	* cause of a serious consistency error with gcc, since the optimizer
727	+	* uses some dangerous trick in pointer subtraction that
728	+	* assumes pointers differ by exact struct size increments.
729	+	*/
730	+	static int
731	+	aposcmp( /* compare ambient value positions */
732	+	const void *avp1,
733	+	const void *avp2
734	+	)
735	+	{
736	+	register long diff = (char const )avp1 - (char * const *)avp2;
737	+	if (diff < 0)
738	+	return(-1);
739	+	return(diff > 0);
740	+	}
741	+
742	+	#if 1
743	+	static int
744	+	avlmemi( /* find list position from address */
745	+	AMBVAL *avaddr
746	+	)
747	+	{
748	+	register AMBVAL **avlpp;
749	+
750	+	avlpp = (AMBVAL *)bsearch((char )&avaddr, (char *)avlist2,
751	+	nambvals, sizeof(AMBVAL *), aposcmp);
752	+	if (avlpp == NULL)
753	+	error(CONSISTENCY, "address not found in avlmemi");
754	+	return(avlpp - avlist2);
755	+	}
756		#else
757	+	#define avlmemi(avaddr) ((AMBVAL *)bsearch((char )&avaddr,(char *)avlist2, \
758	+	nambvals,sizeof(AMBVAL *),aposcmp) - avlist2)
759	+	#endif
760
761	<	static
762	<	ambsync() /* synchronize ambient file */
761	>
762	>	static void
763	>	sortambvals( /* resort ambient values */
764	>	int always
765	>	)
766		{
767	<	static FILE *ambinp = NULL;
768	<	static long lastpos = -1;
769	<	struct flock fls;
767	>	AMBTREE oldatrunk;
768	>	AMBVAL tav, tap, pnext;
769	>	register int i, j;
770	>	/* see if it's time yet */
771	>	if (!always && (ambclock++ < lastsort+sortintvl \|\|
772	>	nambvals < SORT_THRESH))
773	>	return;
774	>	/*
775	>	* The idea here is to minimize memory thrashing
776	>	* in VM systems by improving reference locality.
777	>	* We do this by periodically sorting our stored ambient
778	>	* values in memory in order of most recently to least
779	>	* recently accessed. This ordering was chosen so that new
780	>	* ambient values (which tend to be less important) go into
781	>	* higher memory with the infrequently accessed values.
782	>	* Since we expect our values to need sorting less
783	>	* frequently as the process continues, we double our
784	>	* waiting interval after each call.
785	>	* This routine is also called by setambacc() with
786	>	* the "always" parameter set to 1 so that the ambient
787	>	* tree will be rebuilt with the new accuracy parameter.
788	>	*/
789	>	if (tracktime) { /* allocate pointer arrays to sort */
790	>	avlist2 = (AMBVAL *)malloc(nambvalssizeof(AMBVAL *));
791	>	avlist1 = (struct avl )malloc(nambvalssizeof(struct avl));
792	>	} else {
793	>	avlist2 = NULL;
794	>	avlist1 = NULL;
795	>	}
796	>	if (avlist1 == NULL) { /* no time tracking -- rebuild tree? */
797	>	if (avlist2 != NULL)
798	>	free((void *)avlist2);
799	>	if (always) { /* rebuild without sorting */
800	>	oldatrunk = atrunk;
801	>	atrunk.alist = NULL;
802	>	atrunk.kid = NULL;
803	>	unloadatree(&oldatrunk, avinsert);
804	>	}
805	>	} else { /* sort memory by last access time */
806	>	/*
807	>	* Sorting memory is tricky because it isn't contiguous.
808	>	* We have to sort an array of pointers by MRA and also
809	>	* by memory position. We then copy values in "loops"
810	>	* to minimize memory hits. Nevertheless, we will visit
811	>	* everyone at least twice, and this is an expensive process
812	>	* when we're thrashing, which is when we need to do it.
813	>	*/
814	>	#ifdef DEBUG
815	>	sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...",
816	>	nambvals, ambclock);
817	>	eputs(errmsg);
818	>	#endif
819	>	i_avlist = 0;
820	>	unloadatree(&atrunk, av2list); /* empty current tree */
821	>	#ifdef DEBUG
822	>	if (i_avlist < nambvals)
823	>	error(CONSISTENCY, "missing ambient values in sortambvals");
824	>	#endif
825	>	qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp);
826	>	qsort((char )avlist2, nambvals, sizeof(AMBVAL ), aposcmp);
827	>	for (i = 0; i < nambvals; i++) {
828	>	if (avlist1[i].p == NULL)
829	>	continue;
830	>	tap = avlist2[i];
831	>	tav = *tap;
832	>	for (j = i; (pnext = avlist1[j].p) != tap;
833	>	j = avlmemi(pnext)) {
834	>	(avlist2[j]) = pnext;
835	>	avinsert(avlist2[j]);
836	>	avlist1[j].p = NULL;
837	>	}
838	>	*(avlist2[j]) = tav;
839	>	avinsert(avlist2[j]);
840	>	avlist1[j].p = NULL;
841	>	}
842	>	free((void *)avlist1);
843	>	free((void *)avlist2);
844	>	/* compute new sort interval */
845	>	sortintvl = ambclock - lastsort;
846	>	if (sortintvl >= MAX_SORT_INTVL/2)
847	>	sortintvl = MAX_SORT_INTVL;
848	>	else
849	>	sortintvl <<= 1; /* wait twice as long next */
850	>	#ifdef DEBUG
851	>	eputs("done\n");
852	>	#endif
853	>	}
854	>	if (ambclock >= MAXACLOCK)
855	>	ambclock = MAXACLOCK/2;
856	>	lastsort = ambclock;
857	>	}
858	>
859	>
860	>	#ifdef F_SETLKW
861	>
862	>	static void
863	>	aflock( /* lock/unlock ambient file */
864	>	int typ
865	>	)
866	>	{
867	>	static struct flock fls; /* static so initialized to zeroes */
868	>
869	>	if (typ == fls.l_type) /* already called? */
870	>	return;
871	>	fls.l_type = typ;
872	>	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
873	>	error(SYSTEM, "cannot (un)lock ambient file");
874	>	}
875	>
876	>
877	>	extern int
878	>	ambsync(void) /* synchronize ambient file */
879	>	{
880		long flen;
881		AMBVAL avs;
882		register int n;
883	<	/* gain exclusive access */
884	<	fls.l_type = F_WRLCK;
885	<	fls.l_whence = 0;
886	<	fls.l_start = 0L;
887	<	fls.l_len = 0L;
413	<	if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
414	<	error(SYSTEM, "cannot lock ambient file");
415	<	if (lastpos < 0) /* initializing */
416	<	goto syncend;
883	>
884	>	if (ambfp == NULL) /* no ambient file? */
885	>	return(0);
886	>	/* gain appropriate access */
887	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
888		/* see if file has grown */
889	<	if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0)
890	<	error(SYSTEM, "cannot seek on ambient file");
891	<	if (n = flen - lastpos) { /* file has grown */
892	<	if (ambinp == NULL) {
893	<	ambinp = fopen(ambfname, "r");
889	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
890	>	goto seekerr;
891	>	if ((n = flen - lastpos) > 0) { /* file has grown */
892	>	if (ambinp == NULL) { /* use duplicate filedes */
893	>	ambinp = fdopen(dup(fileno(ambfp)), "r");
894		if (ambinp == NULL)
895	<	error(SYSTEM, "fopen failed in ambsync");
895	>	error(SYSTEM, "fdopen failed in ambsync");
896		}
897	<	if (fseek(ambinp, lastpos, 0) < 0)
898	<	error(SYSTEM, "fseek failed in ambsync");
897	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
898	>	goto seekerr;
899		while (n >= AMBVALSIZ) { /* load contributed values */
900	<	readambval(&avs, ambinp);
901	<	avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize);
900	>	if (!readambval(&avs, ambinp)) {
901	>	sprintf(errmsg,
902	>	"ambient file \"%s\" corrupted near character %ld",
903	>	ambfile, flen - n);
904	>	error(WARNING, errmsg);
905	>	break;
906	>	}
907	>	avinsert(avstore(&avs));
908		n -= AMBVALSIZ;
909		}
910	<	if (n) /* alignment */
911	<	lseek(fileno(ambfp), flen-n, 0);
910	>	lastpos = flen - n;
911	>	/*** seek always as safety measure
912	>	if (n) **/ / alignment */
913	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
914	>	goto seekerr;
915		}
436	–	syncend:
916		n = fflush(ambfp); /* calls write() at last */
917	<	lastpos = lseek(fileno(ambfp), 0L, 1);
918	<	fls.l_type = F_UNLCK; /* release file */
919	<	fcntl(fileno(ambfp), F_SETLKW, &fls);
917	>	if (n != EOF)
918	>	lastpos += (long)nunflshed*AMBVALSIZ;
919	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
920	>	goto seekerr;
921	>
922	>	aflock(F_UNLCK); /* release file */
923	>	nunflshed = 0;
924		return(n);
925	+	seekerr:
926	+	error(SYSTEM, "seek failed in ambsync");
927	+	return -1; /* pro forma return */
928	+	}
929	+
930	+	#else
931	+
932	+	extern int
933	+	ambsync(void) /* flush ambient file */
934	+	{
935	+	if (ambfp == NULL)
936	+	return(0);
937	+	nunflshed = 0;
938	+	return(fflush(ambfp));
939		}
940
941		#endif

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Comparing ray/src/rt/ambient.c (file contents): Revision 2.15 by greg, Wed Jan 20 10:48:23 1993 UTC vs. Revision 2.68 by greg, Thu Oct 14 05:54:44 2010 UTC

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Comparing ray/src/rt/ambient.c (file contents):
Revision 2.15 by greg, Wed Jan 20 10:48:23 1993 UTC vs.
Revision 2.68 by greg, Thu Oct 14 05:54:44 2010 UTC