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 |
– |
static long ambheadlen; /* length of ambient file header */ |
44 |
|
|
45 |
|
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
46 |
|
|
49 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
50 |
|
|
51 |
|
extern long ftell(), lseek(); |
52 |
+ |
static int initambfile(), avsave(), avinsert(), ambsync(); |
53 |
|
|
54 |
|
|
55 |
|
setambres(ar) /* set ambient resolution */ |
73 |
|
setambient(afile) /* initialize calculation */ |
74 |
|
char *afile; |
75 |
|
{ |
76 |
+ |
long headlen; |
77 |
|
AMBVAL amb; |
78 |
|
/* init ambient limits */ |
79 |
|
setambres(ambres); |
80 |
|
/* open ambient file */ |
81 |
< |
if ((afname = afile) != NULL) |
81 |
> |
if (afile != NULL) |
82 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
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)-ambheadlen)%AMBVALSIZ), 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\"", |
97 |
|
} |
98 |
|
|
99 |
|
|
99 |
– |
initambfile(creat) /* initialize ambient file */ |
100 |
– |
int creat; |
101 |
– |
{ |
102 |
– |
extern char *progname, *octname, VersionID[]; |
103 |
– |
|
104 |
– |
setbuf(ambfp, bmalloc(BUFSIZ)); |
105 |
– |
if (creat) { /* new file */ |
106 |
– |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
107 |
– |
progname, colval(ambval,RED), |
108 |
– |
colval(ambval,GRN), colval(ambval,BLU), |
109 |
– |
ambounce, ambacc); |
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 |
119 |
– |
|| !hasambmagic(ambfp)) { |
120 |
– |
sprintf(errmsg, "\"%s\" is not an ambient file", afname); |
121 |
– |
error(USER, errmsg); |
122 |
– |
} |
123 |
– |
ambheadlen = ftell(ambfp); |
124 |
– |
} |
125 |
– |
|
126 |
– |
|
100 |
|
ambnotify(obj) /* record new modifier */ |
101 |
|
OBJECT obj; |
102 |
|
{ |
305 |
|
|
306 |
|
|
307 |
|
static |
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 || !hasambmagic(ambfp)) |
328 |
+ |
error(USER, "bad ambient file"); |
329 |
+ |
} |
330 |
+ |
|
331 |
+ |
|
332 |
+ |
static |
333 |
|
avsave(av) /* insert and save an ambient value */ |
334 |
|
AMBVAL *av; |
335 |
|
{ |
388 |
|
} |
389 |
|
|
390 |
|
|
391 |
< |
#include <fcntl.h> |
391 |
> |
#ifdef NIX |
392 |
|
|
393 |
+ |
static |
394 |
+ |
ambsync() /* flush ambient file */ |
395 |
+ |
{ |
396 |
+ |
return(fflush(ambfp)); |
397 |
+ |
} |
398 |
|
|
399 |
+ |
#else |
400 |
+ |
|
401 |
+ |
#include <fcntl.h> |
402 |
+ |
#include <sys/types.h> |
403 |
+ |
#include <sys/stat.h> |
404 |
+ |
|
405 |
|
static |
406 |
|
ambsync() /* synchronize ambient file */ |
407 |
|
{ |
408 |
|
static FILE *ambinp = NULL; |
409 |
|
struct flock fls; |
410 |
+ |
struct stat sts; |
411 |
|
AMBVAL avs; |
412 |
|
long lastpos, flen; |
413 |
|
register int n; |
419 |
|
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
420 |
|
error(SYSTEM, "cannot lock ambient file"); |
421 |
|
/* see if file has grown */ |
422 |
< |
lastpos = lseek(fileno(ambfp), 0L, 2); /* may move pointer */ |
423 |
< |
flen = lseek(fileno(ambfp), 0L, 1); /* new(?) file length */ |
424 |
< |
if (n = (flen - lastpos)%AMBVALSIZ) /* assure alignment */ |
425 |
< |
lseek(fileno(ambfp), flen -= n, 0); |
422 |
> |
lastpos = lseek(fileno(ambfp), 0L, 1); /* get previous position */ |
423 |
> |
if (fstat(fileno(ambfp), &sts) < 0) /* get current length */ |
424 |
> |
error(SYSTEM, "cannot stat ambient file"); |
425 |
> |
flen = sts.st_size; |
426 |
|
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
427 |
< |
if (ambinp == NULL && (ambinp = fopen(afname, "r")) == NULL) |
428 |
< |
error(SYSTEM, "cannot reopen ambient file"); |
419 |
< |
fseek(ambinp, lastpos, 0); /* go to previous position */ |
427 |
> |
if (ambinp == NULL) /* use duplicate file */ |
428 |
> |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
429 |
|
while (n--) { /* load contributed values */ |
430 |
|
readambval(&avs, ambinp); |
431 |
|
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
432 |
< |
} |
432 |
> |
} /* moves shared file pointer */ |
433 |
> |
if (n = (flen - lastpos)%AMBVALSIZ) /* alignment */ |
434 |
> |
lseek(fileno(ambfp), flen-n, 0); |
435 |
|
} |
436 |
|
n = fflush(ambfp); /* calls write() at last */ |
437 |
|
fls.l_type = F_UNLCK; /* release file */ |
438 |
|
fcntl(fileno(ambfp), F_SETLKW, &fls); |
439 |
|
return(n); |
440 |
|
} |
441 |
+ |
|
442 |
+ |
#endif |