21 |
|
#ifndef OCTSCALE |
22 |
|
#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */ |
23 |
|
#endif |
24 |
– |
#ifndef AMBVWT |
25 |
– |
#define AMBVWT 250 /* relative ambient value weight (# calcs) */ |
26 |
– |
#endif |
24 |
|
|
25 |
|
typedef struct ambtree { |
26 |
|
AMBVAL *alist; /* ambient value list */ |
121 |
|
setambient(afile) /* initialize calculation */ |
122 |
|
char *afile; |
123 |
|
{ |
124 |
< |
long headlen; |
124 |
> |
long pos, flen; |
125 |
|
AMBVAL amb; |
126 |
|
/* init ambient limits */ |
127 |
|
setambres(ambres); |
137 |
|
/* open ambient file */ |
138 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
139 |
|
initambfile(0); |
140 |
< |
headlen = ftell(ambfp); |
140 |
> |
pos = ftell(ambfp); |
141 |
|
while (readambval(&amb, ambfp)) |
142 |
|
avinsert(avstore(&amb)); |
143 |
|
/* align */ |
144 |
< |
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
144 |
> |
pos += (long)nambvals*AMBVALSIZ; |
145 |
> |
flen = lseek(fileno(ambfp), 0L, 2); |
146 |
> |
if (flen != pos) { |
147 |
> |
error(WARNING, |
148 |
> |
"ignoring last %ld values in ambient file (corrupted)", |
149 |
> |
(flen - pos)/AMBVALSIZ); |
150 |
> |
fseek(ambfp, pos, 0); |
151 |
> |
ftruncate(fileno(ambfp), pos); |
152 |
> |
} |
153 |
|
nambshare = nambvals; |
154 |
|
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
155 |
|
initambfile(1); |
227 |
|
return; |
228 |
|
dumbamb: /* return global value */ |
229 |
|
copycolor(acol, ambval); |
230 |
< |
#if AMBVWT |
226 |
< |
if (nambvals == 0) |
230 |
> |
if (ambvwt <= 0 | nambvals == 0) |
231 |
|
return; |
232 |
< |
scalecolor(acol, (double)AMBVWT); |
232 |
> |
scalecolor(acol, (double)ambvwt); |
233 |
|
addcolor(acol, avsum); /* average in computations */ |
234 |
< |
d = 1.0/(AMBVWT+nambvals); |
234 |
> |
d = 1.0/(ambvwt+nambvals); |
235 |
|
scalecolor(acol, d); |
232 |
– |
#endif |
236 |
|
} |
237 |
|
|
238 |
|
|
739 |
|
if (fseek(ambinp, lastpos, 0) < 0) |
740 |
|
goto seekerr; |
741 |
|
while (n >= AMBVALSIZ) { /* load contributed values */ |
742 |
< |
readambval(&avs, ambinp); |
742 |
> |
if (!readambval(&avs, ambinp)) { |
743 |
> |
sprintf(errmsg, |
744 |
> |
"ambient file corrupted near character %ld", |
745 |
> |
flen - n); |
746 |
> |
error(WARNING, errmsg); |
747 |
> |
break; |
748 |
> |
} |
749 |
|
avinsert(avstore(&avs)); |
750 |
|
n -= AMBVALSIZ; |
751 |
|
} |