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)) |
51 |
|
|
52 |
|
|
53 |
+ |
setambres(ar) /* set ambient resolution */ |
54 |
+ |
int ar; |
55 |
+ |
{ |
56 |
+ |
/* set min & max radii */ |
57 |
+ |
if (ar <= 0) { |
58 |
+ |
minarad = 0.0; |
59 |
+ |
maxarad = thescene.cusize / 2.0; |
60 |
+ |
} else { |
61 |
+ |
minarad = thescene.cusize / ar; |
62 |
+ |
maxarad = 16.0 * minarad; /* heuristic */ |
63 |
+ |
if (maxarad > thescene.cusize / 2.0) |
64 |
+ |
maxarad = thescene.cusize / 2.0; |
65 |
+ |
} |
66 |
+ |
if (maxarad <= FTINY) |
67 |
+ |
maxarad = .001; |
68 |
+ |
} |
69 |
+ |
|
70 |
+ |
|
71 |
|
setambient(afile) /* initialize calculation */ |
72 |
|
char *afile; |
73 |
|
{ |
74 |
< |
long ftell(); |
74 |
> |
extern long ftell(); |
75 |
|
AMBVAL amb; |
76 |
< |
|
77 |
< |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
78 |
< |
/* minimum radius */ |
58 |
< |
minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
59 |
< |
|
60 |
< |
/* open ambient file */ |
76 |
> |
/* init ambient limits */ |
77 |
> |
setambres(ambres); |
78 |
> |
/* open ambient file */ |
79 |
|
if (afile != NULL) |
80 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
81 |
< |
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
81 |
> |
initambfile(0); |
82 |
> |
while (readambval(&amb, ambfp)) |
83 |
|
avinsert(&amb, &atrunk, thescene.cuorg, |
84 |
|
thescene.cusize); |
85 |
|
/* align */ |
86 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 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 |
|
{ |
288 |
– |
#ifdef AMBFLUSH |
333 |
|
static int nunflshed = 0; |
334 |
< |
#endif |
334 |
> |
|
335 |
|
if (ambfp == NULL) |
336 |
|
return; |
337 |
< |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
337 |
> |
if (writambval(av, ambfp) < 0) |
338 |
|
goto writerr; |
295 |
– |
#ifdef AMBFLUSH |
339 |
|
if (++nunflshed >= AMBFLUSH) { |
340 |
|
if (fflush(ambfp) == EOF) |
341 |
|
goto writerr; |
342 |
|
nunflshed = 0; |
343 |
|
} |
301 |
– |
#endif |
344 |
|
return; |
345 |
|
writerr: |
346 |
|
error(SYSTEM, "error writing ambient file"); |