| 41 |
|
static AMBTREE atrunk; /* our ambient trunk node */ |
| 42 |
|
|
| 43 |
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
| 44 |
< |
static int ambheadlen; /* length of ambient file header */ |
| 44 |
> |
static char *afname; /* ambient file name */ |
| 45 |
> |
static long ambheadlen; /* length of ambient file header */ |
| 46 |
|
|
| 47 |
|
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
| 48 |
|
|
| 50 |
|
|
| 51 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
| 52 |
|
|
| 53 |
+ |
extern long ftell(), lseek(); |
| 54 |
|
|
| 55 |
+ |
|
| 56 |
|
setambres(ar) /* set ambient resolution */ |
| 57 |
|
int ar; |
| 58 |
|
{ |
| 74 |
|
setambient(afile) /* initialize calculation */ |
| 75 |
|
char *afile; |
| 76 |
|
{ |
| 74 |
– |
extern long ftell(); |
| 77 |
|
AMBVAL amb; |
| 78 |
|
/* init ambient limits */ |
| 79 |
|
setambres(ambres); |
| 80 |
|
/* open ambient file */ |
| 81 |
< |
if (afile != NULL) |
| 81 |
> |
if ((afname = afile) != NULL) |
| 82 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
| 83 |
|
initambfile(0); |
| 84 |
|
while (readambval(&amb, ambfp)) |
| 99 |
|
initambfile(creat) /* initialize ambient file */ |
| 100 |
|
int creat; |
| 101 |
|
{ |
| 102 |
< |
extern char *progname, *octname; |
| 102 |
> |
extern char *progname, *octname, VersionID[]; |
| 103 |
|
|
| 104 |
|
setbuf(ambfp, bmalloc(BUFSIZ)); |
| 105 |
|
if (creat) { /* new file */ |
| 110 |
|
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
| 111 |
|
ambdiv, ambssamp, ambres, |
| 112 |
|
octname==NULL ? "" : octname); |
| 113 |
+ |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
| 114 |
|
fputformat(AMBFMT, ambfp); |
| 115 |
|
putc('\n', ambfp); |
| 116 |
|
putambmagic(ambfp); |
| 117 |
|
fflush(ambfp); |
| 118 |
< |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
| 119 |
< |
error(USER, "ambient file format error"); |
| 118 |
> |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 |
| 119 |
> |
|| !hasambmagic(ambfp)) { |
| 120 |
> |
sprintf(errmsg, "\"%s\" is not an ambient file", afname); |
| 121 |
> |
error(USER, errmsg); |
| 122 |
> |
} |
| 123 |
|
ambheadlen = ftell(ambfp); |
| 124 |
|
} |
| 125 |
|
|
| 300 |
|
VCOPY(amb.gpos, gp); |
| 301 |
|
VCOPY(amb.gdir, gd); |
| 302 |
|
/* insert into tree */ |
| 303 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
| 298 |
< |
avsave(&amb); /* write to file */ |
| 303 |
> |
avsave(&amb); /* and save to file */ |
| 304 |
|
return(amb.rad); |
| 305 |
|
} |
| 306 |
|
|
| 332 |
|
|
| 333 |
|
|
| 334 |
|
static |
| 335 |
< |
avsave(av) /* save an ambient value */ |
| 335 |
> |
avsave(av) /* insert and save an ambient value */ |
| 336 |
|
AMBVAL *av; |
| 337 |
|
{ |
| 338 |
|
static int nunflshed = 0; |
| 339 |
|
|
| 340 |
+ |
avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
| 341 |
|
if (ambfp == NULL) |
| 342 |
|
return; |
| 343 |
|
if (writambval(av, ambfp) < 0) |
| 344 |
|
goto writerr; |
| 345 |
|
if (++nunflshed >= AMBFLUSH) { |
| 346 |
< |
if (fflush(ambfp) == EOF) |
| 346 |
> |
if (ambsync() == EOF) |
| 347 |
|
goto writerr; |
| 348 |
|
nunflshed = 0; |
| 349 |
|
} |
| 387 |
|
return; |
| 388 |
|
memerr: |
| 389 |
|
error(SYSTEM, "out of memory in avinsert"); |
| 390 |
+ |
} |
| 391 |
+ |
|
| 392 |
+ |
|
| 393 |
+ |
#include <fcntl.h> |
| 394 |
+ |
|
| 395 |
+ |
|
| 396 |
+ |
static |
| 397 |
+ |
ambsync() /* synchronize ambient file */ |
| 398 |
+ |
{ |
| 399 |
+ |
static FILE *ambinp = NULL; |
| 400 |
+ |
struct flock fls; |
| 401 |
+ |
AMBVAL avs; |
| 402 |
+ |
long lastpos, flen; |
| 403 |
+ |
register int n; |
| 404 |
+ |
/* gain exclusive access */ |
| 405 |
+ |
fls.l_type = F_WRLCK; |
| 406 |
+ |
fls.l_whence = 0; |
| 407 |
+ |
fls.l_start = 0L; |
| 408 |
+ |
fls.l_len = 0L; |
| 409 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
| 410 |
+ |
error(SYSTEM, "cannot lock ambient file"); |
| 411 |
+ |
/* see if file has grown */ |
| 412 |
+ |
lastpos = lseek(fileno(ambfp), 0L, 2); /* may move pointer */ |
| 413 |
+ |
flen = lseek(fileno(ambfp), 0L, 1); /* new(?) file length */ |
| 414 |
+ |
if (n = (flen - lastpos)%AMBVALSIZ) /* assure alignment */ |
| 415 |
+ |
lseek(fileno(ambfp), flen -= n, 0); |
| 416 |
+ |
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
| 417 |
+ |
if (ambinp == NULL && (ambinp = fopen(afname, "r")) == NULL) |
| 418 |
+ |
error(SYSTEM, "cannot reopen ambient file"); |
| 419 |
+ |
fseek(ambinp, lastpos, 0); /* go to previous position */ |
| 420 |
+ |
while (n--) { /* load contributed values */ |
| 421 |
+ |
readambval(&avs, ambinp); |
| 422 |
+ |
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
| 423 |
+ |
} |
| 424 |
+ |
} |
| 425 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
| 426 |
+ |
fls.l_type = F_UNLCK; /* release file */ |
| 427 |
+ |
fcntl(fileno(ambfp), F_SETLKW, &fls); |
| 428 |
+ |
return(n); |
| 429 |
|
} |
