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 */ |
46 |
|
|
47 |
+ |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
48 |
+ |
|
49 |
|
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
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 |
|
{ |
71 |
– |
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)) |
85 |
|
avinsert(&amb, &atrunk, thescene.cuorg, |
86 |
|
thescene.cusize); |
87 |
|
/* align */ |
88 |
< |
fseek(ambfp, -(ftell(ambfp)%AMBVALSIZ), 1); |
89 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
88 |
> |
fseek(ambfp, -((ftell(ambfp)-ambheadlen)%AMBVALSIZ), 1); |
89 |
> |
} else if ((ambfp = fopen(afile, "w")) != NULL) |
90 |
> |
initambfile(1); |
91 |
> |
else { |
92 |
|
sprintf(errmsg, "cannot open ambient file \"%s\"", |
93 |
|
afile); |
94 |
|
error(SYSTEM, errmsg); |
96 |
|
} |
97 |
|
|
98 |
|
|
99 |
+ |
initambfile(creat) /* initialize ambient file */ |
100 |
+ |
int creat; |
101 |
+ |
{ |
102 |
+ |
extern char *progname, *octname; |
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 |
+ |
fputformat(AMBFMT, ambfp); |
114 |
+ |
putc('\n', ambfp); |
115 |
+ |
putambmagic(ambfp); |
116 |
+ |
fflush(ambfp); |
117 |
+ |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 |
118 |
+ |
|| !hasambmagic(ambfp)) { |
119 |
+ |
sprintf(errmsg, "\"%s\" is not an ambient file", afname); |
120 |
+ |
error(USER, afname); |
121 |
+ |
} |
122 |
+ |
ambheadlen = ftell(ambfp); |
123 |
+ |
} |
124 |
+ |
|
125 |
+ |
|
126 |
|
ambnotify(obj) /* record new modifier */ |
127 |
|
OBJECT obj; |
128 |
|
{ |
299 |
|
VCOPY(amb.gpos, gp); |
300 |
|
VCOPY(amb.gdir, gd); |
301 |
|
/* insert into tree */ |
302 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
268 |
< |
avsave(&amb); /* write to file */ |
302 |
> |
avsave(&amb); /* and save to file */ |
303 |
|
return(amb.rad); |
304 |
|
} |
305 |
|
|
331 |
|
|
332 |
|
|
333 |
|
static |
334 |
< |
avsave(av) /* save an ambient value */ |
334 |
> |
avsave(av) /* insert and save an ambient value */ |
335 |
|
AMBVAL *av; |
336 |
|
{ |
303 |
– |
#ifdef AMBFLUSH |
337 |
|
static int nunflshed = 0; |
338 |
< |
#endif |
338 |
> |
|
339 |
> |
avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
340 |
|
if (ambfp == NULL) |
341 |
|
return; |
342 |
|
if (writambval(av, ambfp) < 0) |
343 |
|
goto writerr; |
310 |
– |
#ifdef AMBFLUSH |
344 |
|
if (++nunflshed >= AMBFLUSH) { |
345 |
< |
if (fflush(ambfp) == EOF) |
345 |
> |
if (ambsync() == EOF) |
346 |
|
goto writerr; |
347 |
|
nunflshed = 0; |
348 |
|
} |
316 |
– |
#endif |
349 |
|
return; |
350 |
|
writerr: |
351 |
|
error(SYSTEM, "error writing ambient file"); |
386 |
|
return; |
387 |
|
memerr: |
388 |
|
error(SYSTEM, "out of memory in avinsert"); |
389 |
+ |
} |
390 |
+ |
|
391 |
+ |
|
392 |
+ |
#include <fcntl.h> |
393 |
+ |
|
394 |
+ |
|
395 |
+ |
static |
396 |
+ |
ambsync() /* synchronize ambient file */ |
397 |
+ |
{ |
398 |
+ |
static FILE *ambinp = NULL; |
399 |
+ |
struct flock fls; |
400 |
+ |
AMBVAL avs; |
401 |
+ |
long lastpos, flen; |
402 |
+ |
register int n; |
403 |
+ |
/* gain exclusive access */ |
404 |
+ |
fls.l_type = F_WRLCK; |
405 |
+ |
fls.l_whence = 0; |
406 |
+ |
fls.l_start = 0L; |
407 |
+ |
fls.l_len = 0L; |
408 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
409 |
+ |
error(SYSTEM, "cannot lock ambient file"); |
410 |
+ |
/* see if file has grown */ |
411 |
+ |
lastpos = lseek(fileno(ambfp), 0L, 2); /* may move pointer */ |
412 |
+ |
flen = lseek(fileno(ambfp), 0L, 1); /* new(?) file length */ |
413 |
+ |
if (n = (flen - lastpos)%AMBVALSIZ) /* assure alignment */ |
414 |
+ |
lseek(fileno(ambfp), flen -= n, 0); |
415 |
+ |
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
416 |
+ |
if (ambinp == NULL && (ambinp = fopen(afname, "r")) == NULL) |
417 |
+ |
error(SYSTEM, "cannot reopen ambient file"); |
418 |
+ |
fseek(ambinp, lastpos, 0); /* go to previous position */ |
419 |
+ |
while (n--) { /* load contributed values */ |
420 |
+ |
readambval(&avs, ambinp); |
421 |
+ |
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
422 |
+ |
} |
423 |
+ |
} |
424 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
425 |
+ |
fls.l_type = F_UNLCK; /* release file */ |
426 |
+ |
fcntl(fileno(ambfp), F_SETLKW, &fls); |
427 |
+ |
return(n); |
428 |
|
} |