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

Comparing ray/src/rt/ambient.c (file contents):
Revision 2.42 by greg, Thu Jan 2 09:37:13 1997 UTC vs.
Revision 2.84 by greg, Sat Apr 26 15:54:43 2014 UTC

#	Line 1 \| Line 1
1	–	/* Copyright (c) 1996 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		#ifndef OCTSCALE
22		#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */
23		#endif
24
25	–	typedef struct ambtree {
26	–	AMBVAL alist; / ambient value list */
27	–	struct ambtree kid; / 8 child nodes */
28	–	} AMBTREE; /* ambient octree */
29	–
30	–	extern CUBE thescene; /* contains space boundaries */
31	–
25		extern char shm_boundary; / memory sharing boundary */
26
27	<	#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 43 \| Line 38 \| *static FILE ambfp = NULL; /* ambient file pointer /*
38		static int nunflshed = 0; /* number of unflushed ambient values */
39
40		#ifndef SORT_THRESH
41	<	#ifdef BIGMEM
42	<	#define SORT_THRESH ((9L<<20)/sizeof(AMBVAL))
41	>	#ifdef SMLMEM
42	>	#define SORT_THRESH ((16L<<20)/sizeof(AMBVAL))
43		#else
44	<	#define SORT_THRESH ((3L<<20)/sizeof(AMBVAL))
44	>	#define SORT_THRESH ((64L<<20)/sizeof(AMBVAL))
45		#endif
46		#endif
47		#ifndef SORT_INTVL
#	Line 56 \| Line 51 \| *static int nunflshed = 0; / number of unflushed ambi**
51		#define MAX_SORT_INTVL (SORT_INTVL<<6)
52		#endif
53
54	<	static COLOR avsum = BLKCOLOR; /* computed ambient value sum */
54	>
55	>	static double avsum = 0.; /* computed ambient value sum (log) */
56	>	static unsigned int navsum = 0; /* number of values in avsum */
57		static unsigned int nambvals = 0; /* total number of indirect values */
58		static unsigned int nambshare = 0; /* number of values from file */
59		static unsigned long ambclock = 0; /* ambient access clock */
60		static unsigned long lastsort = 0; /* time of last value sort */
61		static long sortintvl = SORT_INTVL; /* time until next sort */
62	+	static FILE ambinp = NULL; / auxiliary file for input */
63	+	static long lastpos = -1; /* last flush position */
64
65		#define MAXACLOCK (1L<<30) /* clock turnover value */
66		/*
#	Line 69 \| Line 68 \| *static long sortintvl = SORT_INTVL; / time until nex**
68		* through memory on a multiprocessor, when we want to avoid
69		* claiming our own memory (copy on write). Go ahead anyway
70		* if more than two thirds of our values are unshared.
71	+	* Compile with -Dtracktime=0 to turn this code off.
72		*/
73	+	#ifndef tracktime
74		#define tracktime (shm_boundary == NULL \|\| nambvals > 3*nambshare)
75	+	#endif
76
77		#define AMBFLUSH (BUFSIZ/AMBVALSIZ)
78
79	<	#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL))
79	>	#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL))
80	>	#define freeav(av) free((void *)av);
81
82	<	extern long ftell(), lseek();
83	<	static int initambfile(), avsave(), avinsert(), sortambvals(), avlmemi();
84	<	static AMBVAL *avstore();
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	>	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;
112	<	maxarad = thescene.cusize / 2.0;
112	>	maxarad = thescene.cusize*0.5;
113		} else {
114		minarad = thescene.cusize / ar;
115	<	maxarad = 64 * 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*0.5)
117	>	maxarad = thescene.cusize*0.5;
118		}
119		if (minarad <= FTINY)
120	<	minarad = 10*FTINY;
120	>	minarad = 10.0*FTINY;
121		if (maxarad <= minarad)
122	<	maxarad = 64 * minarad;
122	>	maxarad = 64.0 * minarad;
123		}
124
125
126	<	setambacc(newa) /* set ambient accuracy */
127	<	double newa;
126	>	void
127	>	setambacc( /* set ambient accuracy */
128	>	double newa
129	>	)
130		{
131	<	double ambdiff;
132	<
133	<	if (newa < 0.0)
134	<	newa = 0.0;
135	<	ambdiff = fabs(newa - ambacc);
136	<	if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0)
137	<	sortambvals(1); /* rebuild tree */
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	<	setambient(afile) /* initialize calculation */
143	<	char *afile;
142	>	void
143	>	setambient(void) /* initialize calculation */
144		{
145	<	long pos, flen;
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		setambacc(ambacc);
153	<	if (afile == NULL)
153	>	if (ambfile == NULL \|\| !ambfile[0])
154		return;
155		if (ambacc <= FTINY) {
156		sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened",
157	<	afile);
157	>	ambfile);
158		error(WARNING, errmsg);
159		return;
160		}
161		/* open ambient file */
162	<	if ((ambfp = fopen(afile, "r+")) != NULL) {
163	<	initambfile(0);
164	<	pos = 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(avstore(&amb));
169	<	/* align */
170	<	pos += (long)nambvals*AMBVALSIZ;
145	<	flen = lseek(fileno(ambfp), 0L, 2);
146	<	if (flen != pos) {
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 - pos)/AMBVALSIZ);
185	>	(flen - lastpos)/AMBVALSIZ);
186		error(WARNING, errmsg);
187	<	fseek(ambfp, pos, 0);
188	<	ftruncate(fileno(ambfp), pos);
187	>	fseek(ambfp, lastpos, SEEK_SET);
188	>	#ifndef _WIN32 /* XXX we need a replacement for that one */
189	>	ftruncate(fileno(ambfp), (off_t)lastpos);
190	>	#endif
191		}
192	<	nambshare = nambvals;
193	<	} else if ((ambfp = fopen(afile, "w+")) != NULL)
194	<	initambfile(1);
195	<	else {
196	<	sprintf(errmsg, "cannot open ambient file \"%s\"", afile);
192	>	} else if ((ambfp = fopen(ambfile, "w+")) != NULL) {
193	>	initambfile(1); /* else create new file */
194	>	fflush(ambfp);
195	>	lastpos = ftell(ambfp);
196	>	} else {
197	>	sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile);
198		error(SYSTEM, errmsg);
199		}
200	<	nunflshed++; /* lie */
201	<	ambsync();
200	>	#ifdef getc_unlocked
201	>	flockfile(ambfp); /* application-level lock */
202	>	#endif
203	>	#ifdef F_SETLKW
204	>	aflock(F_UNLCK); /* release file */
205	>	#endif
206		}
207
208
209	<	ambnotify(obj) /* record new modifier */
210	<	OBJECT obj;
209	>	void
210	>	ambdone(void) /* close ambient file and free memory */
211		{
212	+	if (ambfp != NULL) { /* close ambient file */
213	+	ambsync();
214	+	fclose(ambfp);
215	+	ambfp = NULL;
216	+	if (ambinp != NULL) {
217	+	fclose(ambinp);
218	+	ambinp = NULL;
219	+	}
220	+	lastpos = -1;
221	+	}
222	+	/* free ambient tree */
223	+	unloadatree(&atrunk, &avfree);
224	+	/* reset state variables */
225	+	avsum = 0.;
226	+	navsum = 0;
227	+	nambvals = 0;
228	+	nambshare = 0;
229	+	ambclock = 0;
230	+	lastsort = 0;
231	+	sortintvl = SORT_INTVL;
232	+	}
233	+
234	+
235	+	void
236	+	ambnotify( /* record new modifier */
237	+	OBJECT obj
238	+	)
239	+	{
240		static int hitlimit = 0;
241	<	register OBJREC *o = objptr(obj);
242	<	register char **amblp;
241	>	OBJREC *o;
242	>	char **amblp;
243
244	+	if (obj == OVOID) { /* starting over */
245	+	ambset[0] = 0;
246	+	hitlimit = 0;
247	+	return;
248	+	}
249	+	o = objptr(obj);
250		if (hitlimit \|\| !ismodifier(o->otype))
251		return;
252		for (amblp = amblist; *amblp != NULL; amblp++)
#	Line 184 \| Line 261 \| OBJECT obj;
261		}
262		}
263
264	+	/********** THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD *************/
265
266	<	ambient(acol, r, nrm) /* compute ambient component for ray */
267	<	COLOR acol;
268	<	register RAY *r;
269	<	FVECT nrm;
266	>	#ifdef NEWAMB
267	>
268	>	#define tfunc(lwr, x, upr) (((x)-(lwr))/((upr)-(lwr)))
269	>
270	>	static double sumambient(COLOR acol, RAY *r, FVECT rn, int al,
271	>	AMBTREE *at, FVECT c0, double s);
272	>	static int makeambient(COLOR acol, RAY *r, FVECT rn, int al);
273	>	static void extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv,
274	>	FVECT uvw[3]);
275	>
276	>	void
277	>	multambient( /* compute ambient component & multiply by coef. */
278	>	COLOR aval,
279	>	RAY *r,
280	>	FVECT nrm
281	>	)
282		{
283		static int rdepth = 0; /* ambient recursion */
284	<	double d;
284	>	COLOR acol;
285	>	int ok;
286	>	double d, l;
287
288		if (ambdiv <= 0) /* no ambient calculation */
289		goto dumbamb;
#	Line 204 \| Line 296 \| FVECT nrm;
296		goto dumbamb;
297
298		if (ambacc <= FTINY) { /* no ambient storage */
299	+	copycolor(acol, aval);
300		rdepth++;
301	+	ok = doambient(acol, r, r->rweight, NULL, NULL, NULL, NULL);
302	+	rdepth--;
303	+	if (!ok)
304	+	goto dumbamb;
305	+	copycolor(aval, acol);
306	+	return;
307	+	}
308	+
309	+	if (tracktime) /* sort to minimize thrashing */
310	+	sortambvals(0);
311	+	/* interpolate ambient value */
312	+	setcolor(acol, 0.0, 0.0, 0.0);
313	+	d = sumambient(acol, r, nrm, rdepth,
314	+	&atrunk, thescene.cuorg, thescene.cusize);
315	+	if (d > FTINY) {
316	+	d = 1.0/d;
317	+	scalecolor(acol, d);
318	+	multcolor(aval, acol);
319	+	return;
320	+	}
321	+	rdepth++; /* need to cache new value */
322	+	ok = makeambient(acol, r, nrm, rdepth-1);
323	+	rdepth--;
324	+	if (ok) {
325	+	multcolor(aval, acol); /* computed new value */
326	+	return;
327	+	}
328	+	dumbamb: /* return global value */
329	+	if ((ambvwt <= 0) \| (navsum == 0)) {
330	+	multcolor(aval, ambval);
331	+	return;
332	+	}
333	+	l = bright(ambval); /* average in computations */
334	+	if (l > FTINY) {
335	+	d = (log(l)*(double)ambvwt + avsum) /
336	+	(double)(ambvwt + navsum);
337	+	d = exp(d) / l;
338	+	scalecolor(aval, d);
339	+	multcolor(aval, ambval); /* apply color of ambval */
340	+	} else {
341	+	d = exp( avsum / (double)navsum );
342	+	scalecolor(aval, d); /* neutral color */
343	+	}
344	+	}
345	+
346	+
347	+	double
348	+	sumambient( /* get interpolated ambient value */
349	+	COLOR acol,
350	+	RAY *r,
351	+	FVECT rn,
352	+	int al,
353	+	AMBTREE *at,
354	+	FVECT c0,
355	+	double s
356	+	)
357	+	{ /* initial limit is 10 degrees plus ambacc radians */
358	+	const double minangle = 10.0 * PI/180.;
359	+	double maxangle = minangle + ambacc;
360	+	double wsum = 0.0;
361	+	FVECT ck0;
362	+	int i, j;
363	+	AMBVAL *av;
364	+
365	+	if (at->kid != NULL) { /* sum children first */
366	+	s *= 0.5;
367	+	for (i = 0; i < 8; i++) {
368	+	for (j = 0; j < 3; j++) {
369	+	ck0[j] = c0[j];
370	+	if (1<<j & i)
371	+	ck0[j] += s;
372	+	if (r->rop[j] < ck0[j] - OCTSCALE*s)
373	+	break;
374	+	if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s)
375	+	break;
376	+	}
377	+	if (j == 3)
378	+	wsum += sumambient(acol, r, rn, al,
379	+	at->kid+i, ck0, s);
380	+	}
381	+	/* good enough? */
382	+	if (wsum >= 0.05 && s > minarad*10.0)
383	+	return(wsum);
384	+	}
385	+	/* adjust maximum angle */
386	+	if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6))
387	+	maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.;
388	+	/* sum this node */
389	+	for (av = at->alist; av != NULL; av = av->next) {
390	+	double d, delta_r2, delta_t2;
391	+	COLOR ct;
392	+	FVECT uvw[3];
393	+	/* record access */
394	+	if (tracktime)
395	+	av->latick = ambclock;
396	+	/*
397	+	* Ambient level test
398	+	*/
399	+	if (av->lvl > al) /* list sorted, so this works */
400	+	break;
401	+	if (av->weight < 0.9*r->rweight)
402	+	continue;
403	+	/*
404	+	* Direction test using unperturbed normal
405	+	*/
406	+	decodedir(uvw[2], av->ndir);
407	+	d = DOT(uvw[2], r->ron);
408	+	if (d <= 0.0) /* >= 90 degrees */
409	+	continue;
410	+	delta_r2 = 2.0 - 2.0d; / approx. radians^2 */
411	+	if (delta_r2 >= maxangle*maxangle)
412	+	continue;
413	+	/*
414	+	* Modified ray behind test
415	+	*/
416	+	VSUB(ck0, av->pos, r->rop);
417	+	d = DOT(ck0, uvw[2]);
418	+	if (d < -minarad*ambacc-.001)
419	+	continue;
420	+	d /= av->rad[0];
421	+	delta_t2 = d*d;
422	+	if (delta_t2 >= ambacc*ambacc)
423	+	continue;
424	+	/*
425	+	* Elliptical radii test based on Hessian
426	+	*/
427	+	decodedir(uvw[0], av->udir);
428	+	VCROSS(uvw[1], uvw[2], uvw[0]);
429	+	d = DOT(ck0, uvw[0]) / av->rad[0];
430	+	delta_t2 += d*d;
431	+	d = DOT(ck0, uvw[1]) / av->rad[1];
432	+	delta_t2 += d*d;
433	+	if (delta_t2 >= ambacc*ambacc)
434	+	continue;
435	+	/*
436	+	* Extrapolate value and compute final weight (hat function)
437	+	*/
438	+	extambient(ct, av, r->rop, rn, uvw);
439	+	d = tfunc(maxangle, sqrt(delta_r2), 0.0) *
440	+	tfunc(ambacc, sqrt(delta_t2), 0.0);
441	+	scalecolor(ct, d);
442	+	addcolor(acol, ct);
443	+	wsum += d;
444	+	}
445	+	return(wsum);
446	+	}
447	+
448	+
449	+	int
450	+	makeambient( /* make a new ambient value for storage */
451	+	COLOR acol,
452	+	RAY *r,
453	+	FVECT rn,
454	+	int al
455	+	)
456	+	{
457	+	AMBVAL amb;
458	+	FVECT uvw[3];
459	+	int i;
460	+
461	+	amb.weight = 1.0; /* compute weight */
462	+	for (i = al; i-- > 0; )
463	+	amb.weight *= AVGREFL;
464	+	if (r->rweight < 0.1amb.weight) / heuristic override */
465	+	amb.weight = 1.25*r->rweight;
466	+	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
467	+	/* compute ambient */
468	+	i = doambient(acol, r, amb.weight, uvw, amb.rad, amb.gpos, amb.gdir);
469	+	scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */
470	+	if (i <= 0 \|\| amb.rad[0] <= FTINY) /* no Hessian or zero radius */
471	+	return(i);
472	+	/* store value */
473	+	VCOPY(amb.pos, r->rop);
474	+	amb.ndir = encodedir(r->ron);
475	+	amb.udir = encodedir(uvw[0]);
476	+	amb.lvl = al;
477	+	copycolor(amb.val, acol);
478	+	/* insert into tree */
479	+	avsave(&amb); /* and save to file */
480	+	if (rn != r->ron) { /* texture */
481	+	VCOPY(uvw[2], r->ron);
482	+	extambient(acol, &amb, r->rop, rn, uvw);
483	+	}
484	+	return(1);
485	+	}
486	+
487	+
488	+	void
489	+	extambient( /* extrapolate value at pv, nv */
490	+	COLOR cr,
491	+	AMBVAL *ap,
492	+	FVECT pv,
493	+	FVECT nv,
494	+	FVECT uvw[3]
495	+	)
496	+	{
497	+	static FVECT my_uvw[3];
498	+	FVECT v1;
499	+	int i;
500	+	double d = 1.0; /* zeroeth order */
501	+
502	+	if (uvw == NULL) { /* need local coordinates? */
503	+	decodedir(my_uvw[2], ap->ndir);
504	+	decodedir(my_uvw[0], ap->udir);
505	+	VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]);
506	+	uvw = my_uvw;
507	+	}
508	+	for (i = 3; i--; ) /* gradient due to translation */
509	+	d += (pv[i] - ap->pos[i]) *
510	+	(ap->gpos[0]uvw[0][i] + ap->gpos[1]uvw[1][i]);
511	+
512	+	VCROSS(v1, uvw[2], nv); /* gradient due to rotation */
513	+	for (i = 3; i--; )
514	+	d += v1[i] * (ap->gdir[0]uvw[0][i] + ap->gdir[1]uvw[1][i]);
515	+
516	+	if (d <= 0.0) {
517	+	setcolor(cr, 0.0, 0.0, 0.0);
518	+	return;
519	+	}
520	+	copycolor(cr, ap->val);
521	+	scalecolor(cr, d);
522	+	}
523	+
524	+
525	+	static void
526	+	avinsert( /* insert ambient value in our tree */
527	+	AMBVAL *av
528	+	)
529	+	{
530	+	AMBTREE *at;
531	+	AMBVAL *ap;
532	+	AMBVAL avh;
533	+	FVECT ck0;
534	+	double s;
535	+	int branch;
536	+	int i;
537	+
538	+	if (av->rad[0] <= FTINY)
539	+	error(CONSISTENCY, "zero ambient radius in avinsert");
540	+	at = &atrunk;
541	+	VCOPY(ck0, thescene.cuorg);
542	+	s = thescene.cusize;
543	+	while (s(OCTSCALE/2) > av->rad[1]ambacc) {
544	+	if (at->kid == NULL)
545	+	if ((at->kid = newambtree()) == NULL)
546	+	error(SYSTEM, "out of memory in avinsert");
547	+	s *= 0.5;
548	+	branch = 0;
549	+	for (i = 0; i < 3; i++)
550	+	if (av->pos[i] > ck0[i] + s) {
551	+	ck0[i] += s;
552	+	branch \|= 1 << i;
553	+	}
554	+	at = at->kid + branch;
555	+	}
556	+	avh.next = at->alist; /* order by increasing level */
557	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
558	+	if (ap->next->lvl >= av->lvl)
559	+	break;
560	+	av->next = ap->next;
561	+	ap->next = (AMBVAL*)av;
562	+	at->alist = avh.next;
563	+	}
564	+
565	+
566	+	#else /* ! NEWAMB */
567	+
568	+	static double sumambient(COLOR acol, RAY *r, FVECT rn, int al,
569	+	AMBTREE *at, FVECT c0, double s);
570	+	static double makeambient(COLOR acol, RAY *r, FVECT rn, int al);
571	+	static void extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv);
572	+
573	+
574	+	void
575	+	multambient( /* compute ambient component & multiply by coef. */
576	+	COLOR aval,
577	+	RAY *r,
578	+	FVECT nrm
579	+	)
580	+	{
581	+	static int rdepth = 0; /* ambient recursion */
582	+	COLOR acol;
583	+	double d, l;
584	+
585	+	if (ambdiv <= 0) /* no ambient calculation */
586	+	goto dumbamb;
587	+	/* check number of bounces */
588	+	if (rdepth >= ambounce)
589	+	goto dumbamb;
590	+	/* check ambient list */
591	+	if (ambincl != -1 && r->ro != NULL &&
592	+	ambincl != inset(ambset, r->ro->omod))
593	+	goto dumbamb;
594	+
595	+	if (ambacc <= FTINY) { /* no ambient storage */
596	+	copycolor(acol, aval);
597	+	rdepth++;
598		d = doambient(acol, r, r->rweight, NULL, NULL);
599		rdepth--;
600		if (d <= FTINY)
601		goto dumbamb;
602	+	copycolor(aval, acol);
603		return;
604		}
605
606		if (tracktime) /* sort to minimize thrashing */
607		sortambvals(0);
608	<	/* get ambient value */
608	>	/* interpolate ambient value */
609		setcolor(acol, 0.0, 0.0, 0.0);
610		d = sumambient(acol, r, nrm, rdepth,
611		&atrunk, thescene.cuorg, thescene.cusize);
612		if (d > FTINY) {
613	<	scalecolor(acol, 1.0/d);
613	>	d = 1.0/d;
614	>	scalecolor(acol, d);
615	>	multcolor(aval, acol);
616		return;
617		}
618		rdepth++; /* need to cache new value */
619		d = makeambient(acol, r, nrm, rdepth-1);
620		rdepth--;
621	<	if (d > FTINY)
621	>	if (d > FTINY) {
622	>	multcolor(aval, acol); /* got new value */
623		return;
624	+	}
625		dumbamb: /* return global value */
626	<	copycolor(acol, ambval);
627	<	if (ambvwt <= 0 \| nambvals == 0)
626	>	if ((ambvwt <= 0) \| (navsum == 0)) {
627	>	multcolor(aval, ambval);
628		return;
629	<	scalecolor(acol, (double)ambvwt);
630	<	addcolor(acol, avsum); /* average in computations */
631	<	d = 1.0/(ambvwt+nambvals);
632	<	scalecolor(acol, d);
629	>	}
630	>	l = bright(ambval); /* average in computations */
631	>	if (l > FTINY) {
632	>	d = (log(l)*(double)ambvwt + avsum) /
633	>	(double)(ambvwt + navsum);
634	>	d = exp(d) / l;
635	>	scalecolor(aval, d);
636	>	multcolor(aval, ambval); /* apply color of ambval */
637	>	} else {
638	>	d = exp( avsum / (double)navsum );
639	>	scalecolor(aval, d); /* neutral color */
640	>	}
641		}
642
643
644	<	double
645	<	sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */
646	<	COLOR acol;
647	<	register RAY *r;
648	<	FVECT rn;
649	<	int al;
650	<	AMBTREE *at;
651	<	FVECT c0;
652	<	double s;
644	>	static double
645	>	sumambient( /* get interpolated ambient value */
646	>	COLOR acol,
647	>	RAY *r,
648	>	FVECT rn,
649	>	int al,
650	>	AMBTREE *at,
651	>	FVECT c0,
652	>	double s
653	>	)
654		{
655		double d, e1, e2, wt, wsum;
656		COLOR ct;
657		FVECT ck0;
658		int i;
659	<	register int j;
660	<	register AMBVAL *av;
659	>	int j;
660	>	AMBVAL *av;
661
662		wsum = 0.0;
663		/* do this node */
664		for (av = at->alist; av != NULL; av = av->next) {
665	+	double rn_dot = -2.0;
666		if (tracktime)
667		av->latick = ambclock;
668		/*
#	Line 265 \| Line 670 \| double s;
670		*/
671		if (av->lvl > al) /* list sorted, so this works */
672		break;
673	<	if (av->weight < r->rweight-FTINY)
673	>	if (av->weight < 0.9*r->rweight)
674		continue;
675		/*
676		* Ambient radius test.
677		*/
678	<	d = av->pos[0] - r->rop[0];
679	<	e1 = d * d;
275	<	d = av->pos[1] - r->rop[1];
276	<	e1 += d * d;
277	<	d = av->pos[2] - r->rop[2];
278	<	e1 += d * d;
279	<	e1 /= av->rad * av->rad;
678	>	VSUB(ck0, av->pos, r->rop);
679	>	e1 = DOT(ck0, ck0) / (av->rad * av->rad);
680		if (e1 > ambaccambacc1.21)
681		continue;
682		/*
683	<	* Normal direction test.
683	>	* Direction test using closest normal.
684		*/
685	<	e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight;
686	<	if (e2 < 0.0) e2 = 0.0;
687	<	if (e1 + e2 > ambaccambacc1.21)
685	>	d = DOT(av->dir, r->ron);
686	>	if (rn != r->ron) {
687	>	rn_dot = DOT(av->dir, rn);
688	>	if (rn_dot > 1.0-FTINY)
689	>	rn_dot = 1.0-FTINY;
690	>	if (rn_dot >= d-FTINY) {
691	>	d = rn_dot;
692	>	rn_dot = -2.0;
693	>	}
694	>	}
695	>	e2 = (1.0 - d) * r->rweight;
696	>	if (e2 < 0.0)
697	>	e2 = 0.0;
698	>	else if (e1 + e2 > ambaccambacc1.21)
699		continue;
700		/*
701		* Ray behind test.
#	Line 298 \| Line 709 \| double s;
709		/*
710		* Jittering final test reduces image artifacts.
711		*/
712	<	wt = sqrt(e1) + sqrt(e2);
712	>	e1 = sqrt(e1);
713	>	e2 = sqrt(e2);
714	>	wt = e1 + e2;
715		if (wt > ambacc(.9+.2urand(9015+samplendx)))
716		continue;
717	+	/*
718	+	* Recompute directional error using perturbed normal
719	+	*/
720	+	if (rn_dot > 0.0) {
721	+	e2 = sqrt((1.0 - rn_dot)*r->rweight);
722	+	wt = e1 + e2;
723	+	}
724		if (wt <= 1e-3)
725		wt = 1e3;
726		else
#	Line 325 \| Line 745 \| double s;
745		break;
746		}
747		if (j == 3)
748	<	wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s);
748	>	wsum += sumambient(acol, r, rn, al,
749	>	at->kid+i, ck0, s);
750		}
751		return(wsum);
752		}
753
754
755	<	double
756	<	makeambient(acol, r, rn, al) /* make a new ambient value */
757	<	COLOR acol;
758	<	register RAY *r;
759	<	FVECT rn;
760	<	int al;
755	>	static double
756	>	makeambient( /* make a new ambient value for storage */
757	>	COLOR acol,
758	>	RAY *r,
759	>	FVECT rn,
760	>	int al
761	>	)
762		{
763		AMBVAL amb;
764		FVECT gp, gd;
765	<	/* compute weight */
766	<	amb.weight = pow(AVGREFL, (double)al);
767	<	if (r->rweight < 0.1amb.weight) / heuristic */
768	<	amb.weight = r->rweight;
765	>	int i;
766	>
767	>	amb.weight = 1.0; /* compute weight */
768	>	for (i = al; i-- > 0; )
769	>	amb.weight *= AVGREFL;
770	>	if (r->rweight < 0.1amb.weight) / heuristic override */
771	>	amb.weight = 1.25*r->rweight;
772	>	setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
773		/* compute ambient */
774		amb.rad = doambient(acol, r, amb.weight, gp, gd);
775	<	if (amb.rad <= FTINY)
775	>	if (amb.rad <= FTINY) {
776	>	setcolor(acol, 0.0, 0.0, 0.0);
777		return(0.0);
778	<	/* store it */
778	>	}
779	>	scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */
780	>	/* store value */
781		VCOPY(amb.pos, r->rop);
782		VCOPY(amb.dir, r->ron);
783		amb.lvl = al;
#	Line 363 \| Line 792 \| int al;
792		}
793
794
795	<	extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */
796	<	COLOR cr;
797	<	register AMBVAL *ap;
798	<	FVECT pv, nv;
795	>	static void
796	>	extambient( /* extrapolate value at pv, nv */
797	>	COLOR cr,
798	>	AMBVAL *ap,
799	>	FVECT pv,
800	>	FVECT nv
801	>	)
802		{
803	<	FVECT v1, v2;
804	<	register int i;
803	>	FVECT v1;
804	>	int i;
805		double d;
806
807		d = 1.0; /* zeroeth order */
#	Line 377 \| Line 809 \| FVECT pv, nv;
809		for (i = 0; i < 3; i++)
810		d += ap->gpos[i]*(pv[i]-ap->pos[i]);
811		/* gradient due to rotation */
812	<	VCOPY(v1, ap->dir);
813	<	fcross(v2, v1, nv);
382	<	d += DOT(ap->gdir, v2);
812	>	VCROSS(v1, ap->dir, nv);
813	>	d += DOT(ap->gdir, v1);
814		if (d <= 0.0) {
815		setcolor(cr, 0.0, 0.0, 0.0);
816		return;
#	Line 389 \| Line 820 \| FVECT pv, nv;
820		}
821
822
823	<	static
824	<	initambfile(creat) /* initialize ambient file */
825	<	int creat;
823	>	static void
824	>	avinsert( /* insert ambient value in our tree */
825	>	AMBVAL *av
826	>	)
827		{
828	<	extern char progname, octname, VersionID[];
828	>	AMBTREE *at;
829	>	AMBVAL *ap;
830	>	AMBVAL avh;
831	>	FVECT ck0;
832	>	double s;
833	>	int branch;
834	>	int i;
835
836	+	if (av->rad <= FTINY)
837	+	error(CONSISTENCY, "zero ambient radius in avinsert");
838	+	at = &atrunk;
839	+	VCOPY(ck0, thescene.cuorg);
840	+	s = thescene.cusize;
841	+	while (s(OCTSCALE/2) > av->radambacc) {
842	+	if (at->kid == NULL)
843	+	if ((at->kid = newambtree()) == NULL)
844	+	error(SYSTEM, "out of memory in avinsert");
845	+	s *= 0.5;
846	+	branch = 0;
847	+	for (i = 0; i < 3; i++)
848	+	if (av->pos[i] > ck0[i] + s) {
849	+	ck0[i] += s;
850	+	branch \|= 1 << i;
851	+	}
852	+	at = at->kid + branch;
853	+	}
854	+	avh.next = at->alist; /* order by increasing level */
855	+	for (ap = &avh; ap->next != NULL; ap = ap->next)
856	+	if (ap->next->lvl >= av->lvl)
857	+	break;
858	+	av->next = ap->next;
859	+	ap->next = (AMBVAL*)av;
860	+	at->alist = avh.next;
861	+	}
862	+
863	+	#endif /* ! NEWAMB */
864	+
865	+	/*********** FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS *************/
866	+
867	+	static void
868	+	initambfile( /* initialize ambient file */
869	+	int cre8
870	+	)
871	+	{
872	+	extern char progname, octname;
873	+	static char *mybuf = NULL;
874	+
875		#ifdef F_SETLKW
876	<	aflock(creat ? F_WRLCK : F_RDLCK);
876	>	aflock(cre8 ? F_WRLCK : F_RDLCK);
877		#endif
878	<	#ifdef MSDOS
879	<	setmode(fileno(ambfp), O_BINARY);
880	<	#endif
881	<	setbuf(ambfp, bmalloc(BUFSIZ+8));
882	<	if (creat) { /* new file */
878	>	SET_FILE_BINARY(ambfp);
879	>	if (mybuf == NULL)
880	>	mybuf = (char *)bmalloc(BUFSIZ+8);
881	>	setbuf(ambfp, mybuf);
882	>	if (cre8) { /* new file */
883		newheader("RADIANCE", ambfp);
884		fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ",
885		progname, colval(ambval,RED),
886		colval(ambval,GRN), colval(ambval,BLU),
887		ambvwt, ambounce, ambacc);
888	<	fprintf(ambfp, "-ad %d -as %d -ar %d %s\n",
889	<	ambdiv, ambssamp, ambres,
890	<	octname==NULL ? "" : octname);
888	>	fprintf(ambfp, "-ad %d -as %d -ar %d ",
889	>	ambdiv, ambssamp, ambres);
890	>	if (octname != NULL)
891	>	fputs(octname, ambfp);
892	>	fputc('\n', ambfp);
893		fprintf(ambfp, "SOFTWARE= %s\n", VersionID);
894	+	fputnow(ambfp);
895		fputformat(AMBFMT, ambfp);
896	<	putc('\n', ambfp);
896	>	fputc('\n', ambfp);
897		putambmagic(ambfp);
898		} else if (checkheader(ambfp, AMBFMT, NULL) < 0 \|\| !hasambmagic(ambfp))
899		error(USER, "bad ambient file");
900		}
901
902
903	<	static
904	<	avsave(av) /* insert and save an ambient value */
905	<	AMBVAL *av;
903	>	static void
904	>	avsave( /* insert and save an ambient value */
905	>	AMBVAL *av
906	>	)
907		{
908		avinsert(avstore(av));
909		if (ambfp == NULL)
#	Line 434 \| Line 915 \| *AMBVAL av;**
915		goto writerr;
916		return;
917		writerr:
918	<	error(SYSTEM, "error writing ambient file");
918	>	error(SYSTEM, "error writing to ambient file");
919		}
920
921
922		static AMBVAL *
923	<	avstore(aval) /* allocate memory and store aval */
924	<	register AMBVAL *aval;
923	>	avstore( /* allocate memory and store aval */
924	>	AMBVAL *aval
925	>	)
926		{
927	<	register AMBVAL *av;
927	>	AMBVAL *av;
928	>	double d;
929
930		if ((av = newambval()) == NULL)
931		error(SYSTEM, "out of memory in avstore");
932	<	copystruct(av, aval);
932	>	av = aval;
933		av->latick = ambclock;
934		av->next = NULL;
452	–	addcolor(avsum, av->val); /* add to sum for averaging */
935		nambvals++;
936	+	d = bright(av->val);
937	+	if (d > FTINY) { /* add to log sum for averaging */
938	+	avsum += log(d);
939	+	navsum++;
940	+	}
941		return(av);
942		}
943
#	Line 460 \| Line 947 \| *register AMBVAL aval;**
947		static AMBTREE atfreelist = NULL; / free ambient tree structures */
948
949
950	<	static
951	<	AMBTREE *
465	<	newambtree() /* allocate 8 ambient tree structs */
950	>	static AMBTREE *
951	>	newambtree(void) /* allocate 8 ambient tree structs */
952		{
953	<	register AMBTREE atp, upperlim;
953	>	AMBTREE atp, upperlim;
954
955		if (atfreelist == NULL) { /* get more nodes */
956	<	atfreelist = (AMBTREE )bmalloc(ATALLOCSZ8*sizeof(AMBTREE));
956	>	atfreelist = (AMBTREE )malloc(ATALLOCSZ8*sizeof(AMBTREE));
957		if (atfreelist == NULL)
958		return(NULL);
959		/* link new free list */
#	Line 478 \| Line 964 \| *newambtree() / allocate 8 ambient tree structs /*
964		}
965		atp = atfreelist;
966		atfreelist = atp->kid;
967	<	bzero((char )atp, 8sizeof(AMBTREE));
967	>	memset((char )atp, '\0', 8sizeof(AMBTREE));
968		return(atp);
969		}
970
971
972	<	static
973	<	freeambtree(atp) /* free 8 ambient tree structs */
974	<	AMBTREE *atp;
972	>	static void
973	>	freeambtree( /* free 8 ambient tree structs */
974	>	AMBTREE *atp
975	>	)
976		{
977		atp->kid = atfreelist;
978		atfreelist = atp;
979		}
980
981
982	<	static
983	<	avinsert(av) /* insert ambient value in our tree */
984	<	register AMBVAL *av;
982	>	static void
983	>	unloadatree( /* unload an ambient value tree */
984	>	AMBTREE *at,
985	>	unloadtf_t *f
986	>	)
987		{
988	<	register AMBTREE *at;
989	<	register AMBVAL *ap;
501	<	AMBVAL avh;
502	<	FVECT ck0;
503	<	double s;
504	<	int branch;
505	<	register int i;
506	<
507	<	if (av->rad <= FTINY)
508	<	error(CONSISTENCY, "zero ambient radius in avinsert");
509	<	at = &atrunk;
510	<	VCOPY(ck0, thescene.cuorg);
511	<	s = thescene.cusize;
512	<	while (s(OCTSCALE/2) > av->radambacc) {
513	<	if (at->kid == NULL)
514	<	if ((at->kid = newambtree()) == NULL)
515	<	error(SYSTEM, "out of memory in avinsert");
516	<	s *= 0.5;
517	<	branch = 0;
518	<	for (i = 0; i < 3; i++)
519	<	if (av->pos[i] > ck0[i] + s) {
520	<	ck0[i] += s;
521	<	branch \|= 1 << i;
522	<	}
523	<	at = at->kid + branch;
524	<	}
525	<	avh.next = at->alist; /* order by increasing level */
526	<	for (ap = &avh; ap->next != NULL; ap = ap->next)
527	<	if (ap->next->lvl >= av->lvl)
528	<	break;
529	<	av->next = ap->next;
530	<	ap->next = av;
531	<	at->alist = avh.next;
532	<	}
533	<
534	<
535	<	static
536	<	unloadatree(at, f) /* unload an ambient value tree */
537	<	register AMBTREE *at;
538	<	int (*f)();
539	<	{
540	<	register AMBVAL *av;
541	<	register int i;
988	>	AMBVAL *av;
989	>	int i;
990		/* transfer values at this node */
991		for (av = at->alist; av != NULL; av = at->alist) {
992		at->alist = av->next;
#	Line 560 \| Line 1008 \| static struct avl {
1008		static AMBVAL *avlist2; / memory positions for sorting */
1009		static int i_avlist; /* index for lists */
1010
1011	+	static int alatcmp(const void av1, const void av2);
1012
1013	<	static
1014	<	av2list(av)
566	<	register AMBVAL *av;
1013	>	static void
1014	>	avfree(AMBVAL *av)
1015		{
1016	+	free(av);
1017	+	}
1018	+
1019	+	static void
1020	+	av2list(
1021	+	AMBVAL *av
1022	+	)
1023	+	{
1024		#ifdef DEBUG
1025		if (i_avlist >= nambvals)
1026		error(CONSISTENCY, "too many ambient values in av2list1");
1027		#endif
1028	<	avlist1[i_avlist].p = avlist2[i_avlist] = av;
1028	>	avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av;
1029		avlist1[i_avlist++].t = av->latick;
1030		}
1031
1032
1033		static int
1034	<	alatcmp(av1, av2) /* compare ambient values for MRA */
1035	<	struct avl av1, av2;
1034	>	alatcmp( /* compare ambient values for MRA */
1035	>	const void *av1,
1036	>	const void *av2
1037	>	)
1038		{
1039	<	register long lc = av2->t - av1->t;
1039	>	long lc = ((struct avl )av2)->t - ((struct avl )av1)->t;
1040		return(lc<0 ? -1 : lc>0 ? 1 : 0);
1041		}
1042
1043
1044	+	/* GW NOTE 2002/10/3:
1045	+	* I used to compare AMBVAL pointers, but found that this was the
1046	+	* cause of a serious consistency error with gcc, since the optimizer
1047	+	* uses some dangerous trick in pointer subtraction that
1048	+	* assumes pointers differ by exact struct size increments.
1049	+	*/
1050		static int
1051	<	aposcmp(avp1, avp2) /* compare ambient value positions */
1052	<	AMBVAL avp1, avp2;
1051	>	aposcmp( /* compare ambient value positions */
1052	>	const void *avp1,
1053	>	const void *avp2
1054	>	)
1055		{
1056	<	return(avp1 - avp2);
1056	>	long diff = (char const )avp1 - (char * const *)avp2;
1057	>	if (diff < 0)
1058	>	return(-1);
1059	>	return(diff > 0);
1060		}
1061
1062
594	–	#if 1
1063		static int
1064	<	avlmemi(avaddr) /* find list position from address */
1065	<	AMBVAL *avaddr;
1064	>	avlmemi( /* find list position from address */
1065	>	AMBVAL *avaddr
1066	>	)
1067		{
1068	<	register AMBVAL **avlpp;
1068	>	AMBVAL **avlpp;
1069
1070		avlpp = (AMBVAL *)bsearch((char )&avaddr, (char *)avlist2,
1071	<	nambvals, sizeof(AMBVAL *), aposcmp);
1071	>	nambvals, sizeof(AMBVAL *), &aposcmp);
1072		if (avlpp == NULL)
1073		error(CONSISTENCY, "address not found in avlmemi");
1074		return(avlpp - avlist2);
1075		}
607	–	#else
608	–	#define avlmemi(avaddr) ((AMBVAL *)bsearch((char )&avaddr,(char *)avlist2, \
609	–	nambvals,sizeof(AMBVAL *),aposcmp) - avlist2)
610	–	#endif
1076
1077
1078	<	static
1079	<	sortambvals(always) /* resort ambient values */
1080	<	int always;
1078	>	static void
1079	>	sortambvals( /* resort ambient values */
1080	>	int always
1081	>	)
1082		{
1083		AMBTREE oldatrunk;
1084		AMBVAL tav, tap, pnext;
1085	<	register int i, j;
1085	>	int i, j;
1086		/* see if it's time yet */
1087		if (!always && (ambclock++ < lastsort+sortintvl \|\|
1088		nambvals < SORT_THRESH))
#	Line 645 \| Line 1111 \| int always;
1111		}
1112		if (avlist1 == NULL) { /* no time tracking -- rebuild tree? */
1113		if (avlist2 != NULL)
1114	<	free((char *)avlist2);
1114	>	free((void *)avlist2);
1115		if (always) { /* rebuild without sorting */
1116	<	copystruct(&oldatrunk, &atrunk);
1116	>	oldatrunk = atrunk;
1117		atrunk.alist = NULL;
1118		atrunk.kid = NULL;
1119	<	unloadatree(&oldatrunk, avinsert);
1119	>	unloadatree(&oldatrunk, &avinsert);
1120		}
1121		} else { /* sort memory by last access time */
1122		/*
#	Line 667 \| Line 1133 \| int always;
1133		eputs(errmsg);
1134		#endif
1135		i_avlist = 0;
1136	<	unloadatree(&atrunk, av2list); /* empty current tree */
1136	>	unloadatree(&atrunk, &av2list); /* empty current tree */
1137		#ifdef DEBUG
1138		if (i_avlist < nambvals)
1139		error(CONSISTENCY, "missing ambient values in sortambvals");
1140		#endif
1141	<	qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp);
1142	<	qsort((char )avlist2, nambvals, sizeof(AMBVAL ), aposcmp);
1141	>	qsort((char *)avlist1, nambvals, sizeof(struct avl), &alatcmp);
1142	>	qsort((char )avlist2, nambvals, sizeof(AMBVAL ), &aposcmp);
1143		for (i = 0; i < nambvals; i++) {
1144		if (avlist1[i].p == NULL)
1145		continue;
1146		tap = avlist2[i];
1147	<	copystruct(&tav, tap);
1147	>	tav = *tap;
1148		for (j = i; (pnext = avlist1[j].p) != tap;
1149		j = avlmemi(pnext)) {
1150	<	copystruct(avlist2[j], pnext);
1150	>	(avlist2[j]) = pnext;
1151		avinsert(avlist2[j]);
1152		avlist1[j].p = NULL;
1153		}
1154	<	copystruct(avlist2[j], &tav);
1154	>	*(avlist2[j]) = tav;
1155		avinsert(avlist2[j]);
1156		avlist1[j].p = NULL;
1157		}
1158	<	free((char *)avlist1);
1159	<	free((char *)avlist2);
1158	>	free((void *)avlist1);
1159	>	free((void *)avlist2);
1160		/* compute new sort interval */
1161		sortintvl = ambclock - lastsort;
1162		if (sortintvl >= MAX_SORT_INTVL/2)
#	Line 709 \| Line 1175 \| int always;
1175
1176		#ifdef F_SETLKW
1177
1178	<	static
1179	<	aflock(typ) /* lock/unlock ambient file */
1180	<	int typ;
1178	>	static void
1179	>	aflock( /* lock/unlock ambient file */
1180	>	int typ
1181	>	)
1182		{
1183		static struct flock fls; /* static so initialized to zeroes */
1184
1185	+	if (typ == fls.l_type) /* already called? */
1186	+	return;
1187		fls.l_type = typ;
1188		if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0)
1189		error(SYSTEM, "cannot (un)lock ambient file");
#	Line 722 \| Line 1191 \| int typ;
1191
1192
1193		int
1194	<	ambsync() /* synchronize ambient file */
1194	>	ambsync(void) /* synchronize ambient file */
1195		{
727	–	static FILE *ambinp = NULL;
728	–	static long lastpos = -1;
1196		long flen;
1197		AMBVAL avs;
1198	<	register int n;
1198	>	int n;
1199
1200	<	if (nunflshed == 0)
1200	>	if (ambfp == NULL) /* no ambient file? */
1201		return(0);
1202	<	if (lastpos < 0) /* initializing (locked in initambfile) */
1203	<	goto syncend;
737	<	/* gain exclusive access */
738	<	aflock(F_WRLCK);
1202	>	/* gain appropriate access */
1203	>	aflock(nunflshed ? F_WRLCK : F_RDLCK);
1204		/* see if file has grown */
1205	<	if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0)
1205	>	if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0)
1206		goto seekerr;
1207	<	if (n = flen - lastpos) { /* file has grown */
1207	>	if ((n = flen - lastpos) > 0) { /* file has grown */
1208		if (ambinp == NULL) { /* use duplicate filedes */
1209		ambinp = fdopen(dup(fileno(ambfp)), "r");
1210		if (ambinp == NULL)
1211		error(SYSTEM, "fdopen failed in ambsync");
1212		}
1213	<	if (fseek(ambinp, lastpos, 0) < 0)
1213	>	if (fseek(ambinp, lastpos, SEEK_SET) < 0)
1214		goto seekerr;
1215		while (n >= AMBVALSIZ) { /* load contributed values */
1216		if (!readambval(&avs, ambinp)) {
1217		sprintf(errmsg,
1218	<	"ambient file corrupted near character %ld",
1219	<	flen - n);
1218	>	"ambient file \"%s\" corrupted near character %ld",
1219	>	ambfile, flen - n);
1220		error(WARNING, errmsg);
1221		break;
1222		}
1223		avinsert(avstore(&avs));
1224		n -= AMBVALSIZ;
1225		}
1226	+	lastpos = flen - n;
1227		/*** seek always as safety measure
1228		if (n) **/ / alignment */
1229	<	if (lseek(fileno(ambfp), flen-n, 0) < 0)
1229	>	if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0)
1230		goto seekerr;
1231		}
766	–	#ifdef DEBUG
767	–	if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) {
768	–	sprintf(errmsg, "ambient file buffer at %d rather than %d",
769	–	ambfp->_ptr - ambfp->_base,
770	–	nunflshed*AMBVALSIZ);
771	–	error(CONSISTENCY, errmsg);
772	–	}
773	–	#endif
774	–	syncend:
1232		n = fflush(ambfp); /* calls write() at last */
1233	<	if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0)
1233	>	if (n != EOF)
1234	>	lastpos += (long)nunflshed*AMBVALSIZ;
1235	>	else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0)
1236		goto seekerr;
1237	+
1238		aflock(F_UNLCK); /* release file */
1239		nunflshed = 0;
1240		return(n);
1241		seekerr:
1242		error(SYSTEM, "seek failed in ambsync");
1243	+	return -1; /* pro forma return */
1244		}
1245
1246	<	#else
1246	>	#else /* ! F_SETLKW */
1247
1248		int
1249	<	ambsync() /* flush ambient file */
1249	>	ambsync(void) /* flush ambient file */
1250		{
1251	<	if (nunflshed == 0)
1251	>	if (ambfp == NULL)
1252		return(0);
1253		nunflshed = 0;
1254		return(fflush(ambfp));
1255		}
1256
1257	<	#endif
1257	>	#endif /* ! F_SETLKW */

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Comparing ray/src/rt/ambient.c (file contents): Revision 2.42 by greg, Thu Jan 2 09:37:13 1997 UTC vs. Revision 2.84 by greg, Sat Apr 26 15:54:43 2014 UTC

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Comparing ray/src/rt/ambient.c (file contents):
Revision 2.42 by greg, Thu Jan 2 09:37:13 1997 UTC vs.
Revision 2.84 by greg, Sat Apr 26 15:54:43 2014 UTC