41 |
|
static AMBTREE atrunk; /* our ambient trunk node */ |
42 |
|
|
43 |
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
44 |
+ |
static char *afname; /* ambient file name */ |
45 |
|
|
46 |
+ |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
47 |
+ |
|
48 |
|
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
49 |
|
|
50 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
51 |
|
|
52 |
+ |
extern long ftell(), lseek(); |
53 |
|
|
54 |
+ |
|
55 |
+ |
setambres(ar) /* set ambient resolution */ |
56 |
+ |
int ar; |
57 |
+ |
{ |
58 |
+ |
/* set min & max radii */ |
59 |
+ |
if (ar <= 0) { |
60 |
+ |
minarad = 0.0; |
61 |
+ |
maxarad = thescene.cusize / 2.0; |
62 |
+ |
} else { |
63 |
+ |
minarad = thescene.cusize / ar; |
64 |
+ |
maxarad = 16.0 * minarad; /* heuristic */ |
65 |
+ |
if (maxarad > thescene.cusize / 2.0) |
66 |
+ |
maxarad = thescene.cusize / 2.0; |
67 |
+ |
} |
68 |
+ |
if (maxarad <= FTINY) |
69 |
+ |
maxarad = .001; |
70 |
+ |
} |
71 |
+ |
|
72 |
+ |
|
73 |
|
setambient(afile) /* initialize calculation */ |
74 |
|
char *afile; |
75 |
|
{ |
76 |
< |
long ftell(); |
76 |
> |
long headlen; |
77 |
|
AMBVAL amb; |
78 |
< |
|
79 |
< |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
80 |
< |
/* minimum radius */ |
81 |
< |
minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
59 |
< |
|
60 |
< |
/* open ambient file */ |
61 |
< |
if (afile != NULL) |
78 |
> |
/* init ambient limits */ |
79 |
> |
setambres(ambres); |
80 |
> |
/* open ambient file */ |
81 |
> |
if ((afname = afile) != NULL) |
82 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
83 |
< |
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
83 |
> |
initambfile(0); |
84 |
> |
headlen = ftell(ambfp); |
85 |
> |
while (readambval(&amb, ambfp)) |
86 |
|
avinsert(&amb, &atrunk, thescene.cuorg, |
87 |
|
thescene.cusize); |
88 |
|
/* align */ |
89 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); |
90 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
89 |
> |
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
90 |
> |
} else if ((ambfp = fopen(afile, "w")) != NULL) |
91 |
> |
initambfile(1); |
92 |
> |
else { |
93 |
|
sprintf(errmsg, "cannot open ambient file \"%s\"", |
94 |
|
afile); |
95 |
|
error(SYSTEM, errmsg); |
216 |
|
* Jittering final test reduces image artifacts. |
217 |
|
*/ |
218 |
|
wt = sqrt(e1) + sqrt(e2); |
219 |
< |
wt *= .9 + .2*frandom(); |
219 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
220 |
|
if (wt > ambacc) |
221 |
|
continue; |
222 |
|
if (wt <= 1e-3) |
273 |
|
VCOPY(amb.gpos, gp); |
274 |
|
VCOPY(amb.gdir, gd); |
275 |
|
/* insert into tree */ |
276 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
253 |
< |
avsave(&amb); /* write to file */ |
276 |
> |
avsave(&amb); /* and save to file */ |
277 |
|
return(amb.rad); |
278 |
|
} |
279 |
|
|
305 |
|
|
306 |
|
|
307 |
|
static |
308 |
< |
avsave(av) /* save an ambient value */ |
308 |
> |
initambfile(creat) /* initialize ambient file */ |
309 |
> |
int creat; |
310 |
> |
{ |
311 |
> |
extern char *progname, *octname, VersionID[]; |
312 |
> |
|
313 |
> |
setbuf(ambfp, bmalloc(BUFSIZ)); |
314 |
> |
if (creat) { /* new file */ |
315 |
> |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
316 |
> |
progname, colval(ambval,RED), |
317 |
> |
colval(ambval,GRN), colval(ambval,BLU), |
318 |
> |
ambounce, ambacc); |
319 |
> |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
320 |
> |
ambdiv, ambssamp, ambres, |
321 |
> |
octname==NULL ? "" : octname); |
322 |
> |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
323 |
> |
fputformat(AMBFMT, ambfp); |
324 |
> |
putc('\n', ambfp); |
325 |
> |
putambmagic(ambfp); |
326 |
> |
fflush(ambfp); |
327 |
> |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 |
328 |
> |
|| !hasambmagic(ambfp)) { |
329 |
> |
sprintf(errmsg, "\"%s\" is not an ambient file", afname); |
330 |
> |
error(USER, errmsg); |
331 |
> |
} |
332 |
> |
} |
333 |
> |
|
334 |
> |
|
335 |
> |
static |
336 |
> |
avsave(av) /* insert and save an ambient value */ |
337 |
|
AMBVAL *av; |
338 |
|
{ |
288 |
– |
#ifdef AMBFLUSH |
339 |
|
static int nunflshed = 0; |
340 |
< |
#endif |
340 |
> |
|
341 |
> |
avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
342 |
|
if (ambfp == NULL) |
343 |
|
return; |
344 |
< |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
344 |
> |
if (writambval(av, ambfp) < 0) |
345 |
|
goto writerr; |
295 |
– |
#ifdef AMBFLUSH |
346 |
|
if (++nunflshed >= AMBFLUSH) { |
347 |
< |
if (fflush(ambfp) == EOF) |
347 |
> |
if (ambsync() == EOF) |
348 |
|
goto writerr; |
349 |
|
nunflshed = 0; |
350 |
|
} |
301 |
– |
#endif |
351 |
|
return; |
352 |
|
writerr: |
353 |
|
error(SYSTEM, "error writing ambient file"); |
388 |
|
return; |
389 |
|
memerr: |
390 |
|
error(SYSTEM, "out of memory in avinsert"); |
391 |
+ |
} |
392 |
+ |
|
393 |
+ |
|
394 |
+ |
#include <fcntl.h> |
395 |
+ |
|
396 |
+ |
|
397 |
+ |
static |
398 |
+ |
ambsync() /* synchronize ambient file */ |
399 |
+ |
{ |
400 |
+ |
static FILE *ambinp = NULL; |
401 |
+ |
struct flock fls; |
402 |
+ |
AMBVAL avs; |
403 |
+ |
long lastpos, flen; |
404 |
+ |
register int n; |
405 |
+ |
/* gain exclusive access */ |
406 |
+ |
fls.l_type = F_WRLCK; |
407 |
+ |
fls.l_whence = 0; |
408 |
+ |
fls.l_start = 0L; |
409 |
+ |
fls.l_len = 0L; |
410 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
411 |
+ |
error(SYSTEM, "cannot lock ambient file"); |
412 |
+ |
/* see if file has grown */ |
413 |
+ |
lastpos = lseek(fileno(ambfp), 0L, 1); /* get previous position */ |
414 |
+ |
flen = lseek(fileno(ambfp), 0L, 2); /* new(?) file length */ |
415 |
+ |
if (n = (flen - lastpos)%AMBVALSIZ) /* assure alignment */ |
416 |
+ |
lseek(fileno(ambfp), (long)-n, 1); |
417 |
+ |
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
418 |
+ |
if (ambinp == NULL && (ambinp = fopen(afname, "r")) == NULL) |
419 |
+ |
error(SYSTEM, "cannot reopen ambient file"); |
420 |
+ |
fseek(ambinp, lastpos, 0); /* go to previous position */ |
421 |
+ |
while (n--) { /* load contributed values */ |
422 |
+ |
readambval(&avs, ambinp); |
423 |
+ |
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
424 |
+ |
} |
425 |
+ |
} |
426 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
427 |
+ |
fls.l_type = F_UNLCK; /* release file */ |
428 |
+ |
fcntl(fileno(ambfp), F_SETLKW, &fls); |
429 |
+ |
return(n); |
430 |
|
} |