| 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 */ |
| 45 |
|
|
| 46 |
+ |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
| 47 |
+ |
|
| 48 |
|
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
| 49 |
|
|
| 50 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
| 71 |
|
setambient(afile) /* initialize calculation */ |
| 72 |
|
char *afile; |
| 73 |
|
{ |
| 74 |
< |
long ftell(); |
| 74 |
> |
extern long ftell(); |
| 75 |
|
AMBVAL amb; |
| 76 |
|
/* init ambient limits */ |
| 77 |
|
setambres(ambres); |
| 78 |
|
/* open ambient file */ |
| 79 |
|
if (afile != NULL) |
| 80 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
| 81 |
+ |
initambfile(0); |
| 82 |
|
while (readambval(&amb, ambfp)) |
| 83 |
|
avinsert(&amb, &atrunk, thescene.cuorg, |
| 84 |
|
thescene.cusize); |
| 85 |
|
/* align */ |
| 86 |
< |
fseek(ambfp, -(ftell(ambfp)%AMBVALSIZ), 1); |
| 87 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
| 86 |
> |
fseek(ambfp, -((ftell(ambfp)-ambheadlen)%AMBVALSIZ), 1); |
| 87 |
> |
} else if ((ambfp = fopen(afile, "w")) != NULL) |
| 88 |
> |
initambfile(1); |
| 89 |
> |
else { |
| 90 |
|
sprintf(errmsg, "cannot open ambient file \"%s\"", |
| 91 |
|
afile); |
| 92 |
|
error(SYSTEM, errmsg); |
| 94 |
|
} |
| 95 |
|
|
| 96 |
|
|
| 97 |
+ |
initambfile(creat) /* initialize ambient file */ |
| 98 |
+ |
int creat; |
| 99 |
+ |
{ |
| 100 |
+ |
extern char *progname, *octname; |
| 101 |
+ |
|
| 102 |
+ |
setbuf(ambfp, bmalloc(BUFSIZ)); |
| 103 |
+ |
if (creat) { /* new file */ |
| 104 |
+ |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
| 105 |
+ |
progname, colval(ambval,RED), |
| 106 |
+ |
colval(ambval,GRN), colval(ambval,BLU), |
| 107 |
+ |
ambounce, ambacc); |
| 108 |
+ |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
| 109 |
+ |
ambdiv, ambssamp, ambres, |
| 110 |
+ |
octname==NULL ? "" : octname); |
| 111 |
+ |
fputformat(AMBFMT, ambfp); |
| 112 |
+ |
putc('\n', ambfp); |
| 113 |
+ |
putambmagic(ambfp); |
| 114 |
+ |
fflush(ambfp); |
| 115 |
+ |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
| 116 |
+ |
error(USER, "ambient file format error"); |
| 117 |
+ |
ambheadlen = ftell(ambfp); |
| 118 |
+ |
} |
| 119 |
+ |
|
| 120 |
+ |
|
| 121 |
|
ambnotify(obj) /* record new modifier */ |
| 122 |
|
OBJECT obj; |
| 123 |
|
{ |
| 330 |
|
avsave(av) /* save an ambient value */ |
| 331 |
|
AMBVAL *av; |
| 332 |
|
{ |
| 303 |
– |
#ifdef AMBFLUSH |
| 333 |
|
static int nunflshed = 0; |
| 334 |
< |
#endif |
| 334 |
> |
|
| 335 |
|
if (ambfp == NULL) |
| 336 |
|
return; |
| 337 |
|
if (writambval(av, ambfp) < 0) |
| 338 |
|
goto writerr; |
| 310 |
– |
#ifdef AMBFLUSH |
| 339 |
|
if (++nunflshed >= AMBFLUSH) { |
| 340 |
|
if (fflush(ambfp) == EOF) |
| 341 |
|
goto writerr; |
| 342 |
|
nunflshed = 0; |
| 343 |
|
} |
| 316 |
– |
#endif |
| 344 |
|
return; |
| 345 |
|
writerr: |
| 346 |
|
error(SYSTEM, "error writing ambient file"); |
