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 */ |
45 |
|
|
46 |
|
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
47 |
|
|
73 |
|
setambient(afile) /* initialize calculation */ |
74 |
|
char *afile; |
75 |
|
{ |
76 |
+ |
long headlen; |
77 |
|
AMBVAL amb; |
78 |
|
/* init ambient limits */ |
79 |
|
setambres(ambres); |
81 |
|
if ((afname = 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); |
89 |
> |
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
90 |
|
} else if ((ambfp = fopen(afile, "w")) != NULL) |
91 |
|
initambfile(1); |
92 |
|
else { |
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 |
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 |
|
{ |
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, 2); /* may move pointer */ |
414 |
< |
flen = lseek(fileno(ambfp), 0L, 1); /* new(?) file length */ |
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), flen -= n, 0); |
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"); |