1 |
< |
/* Copyright (c) 1991 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1993 Regents of the University of California */ |
2 |
|
|
3 |
|
#ifndef lint |
4 |
|
static char SCCSid[] = "$SunId$ LBL"; |
6 |
|
|
7 |
|
/* |
8 |
|
* ambient.c - routines dealing with ambient (inter-reflected) component. |
9 |
– |
* |
10 |
– |
* The macro AMBFLUSH (if defined) is the number of ambient values |
11 |
– |
* to wait before flushing to the ambient file. |
12 |
– |
* |
13 |
– |
* 5/9/86 |
9 |
|
*/ |
10 |
|
|
11 |
|
#include "ray.h" |
18 |
|
|
19 |
|
#include "random.h" |
20 |
|
|
21 |
< |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
21 |
> |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
22 |
|
|
23 |
|
typedef struct ambtree { |
24 |
< |
AMBVAL *alist; /* ambient value list */ |
25 |
< |
struct ambtree *kid; /* 8 child nodes */ |
24 |
> |
AMBVAL *alist; /* ambient value list */ |
25 |
> |
struct ambtree *kid; /* 8 child nodes */ |
26 |
|
} AMBTREE; /* ambient octree */ |
27 |
|
|
28 |
|
extern CUBE thescene; /* contains space boundaries */ |
29 |
|
|
30 |
< |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
31 |
< |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
30 |
> |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
31 |
> |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
32 |
|
|
33 |
< |
double maxarad; /* maximum ambient radius */ |
34 |
< |
double minarad; /* minimum ambient radius */ |
33 |
> |
double maxarad; /* maximum ambient radius */ |
34 |
> |
double minarad; /* minimum ambient radius */ |
35 |
|
|
36 |
< |
static AMBTREE atrunk; /* our ambient trunk node */ |
36 |
> |
static AMBTREE atrunk; /* our ambient trunk node */ |
37 |
|
|
38 |
+ |
static char *ambfname = NULL; /* ambient file name */ |
39 |
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
40 |
+ |
static int nunflshed = 0; /* number of unflushed ambient values */ |
41 |
|
|
42 |
< |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
42 |
> |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
43 |
|
|
44 |
< |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
44 |
> |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
45 |
|
|
46 |
< |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
46 |
> |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
47 |
|
|
48 |
|
extern long ftell(), lseek(); |
49 |
< |
static int initambfile(), avsave(), avinsert(), ambsync(); |
49 |
> |
static int initambfile(), avsave(), avinsert(); |
50 |
|
|
51 |
|
|
52 |
|
setambres(ar) /* set ambient resolution */ |
71 |
|
char *afile; |
72 |
|
{ |
73 |
|
long headlen; |
74 |
< |
AMBVAL amb; |
74 |
> |
AMBVAL amb; |
75 |
|
/* init ambient limits */ |
76 |
|
setambres(ambres); |
77 |
|
/* open ambient file */ |
78 |
< |
if (afile != NULL) |
78 |
> |
if ((ambfname = afile) != NULL) { |
79 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
80 |
|
initambfile(0); |
81 |
|
headlen = ftell(ambfp); |
91 |
|
afile); |
92 |
|
error(SYSTEM, errmsg); |
93 |
|
} |
94 |
+ |
nunflshed++; /* lie */ |
95 |
+ |
ambsync(); |
96 |
+ |
} |
97 |
|
} |
98 |
|
|
99 |
|
|
100 |
|
ambnotify(obj) /* record new modifier */ |
101 |
< |
OBJECT obj; |
101 |
> |
OBJECT obj; |
102 |
|
{ |
103 |
|
static int hitlimit = 0; |
104 |
< |
register OBJREC *o = objptr(obj); |
104 |
> |
register OBJREC *o = objptr(obj); |
105 |
|
register char **amblp; |
106 |
|
|
107 |
|
if (hitlimit || !ismodifier(o->otype)) |
124 |
|
register RAY *r; |
125 |
|
{ |
126 |
|
static int rdepth = 0; /* ambient recursion */ |
127 |
< |
double d; |
127 |
> |
double d; |
128 |
|
|
129 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
130 |
|
goto dumbamb; |
166 |
|
COLOR acol; |
167 |
|
register RAY *r; |
168 |
|
int al; |
169 |
< |
AMBTREE *at; |
169 |
> |
AMBTREE *at; |
170 |
|
FVECT c0; |
171 |
< |
double s; |
171 |
> |
double s; |
172 |
|
{ |
173 |
< |
extern double sqrt(); |
174 |
< |
double d, e1, e2, wt, wsum; |
173 |
> |
double d, e1, e2, wt, wsum; |
174 |
|
COLOR ct; |
175 |
|
FVECT ck0; |
176 |
|
int i; |
177 |
|
register int j; |
178 |
< |
register AMBVAL *av; |
178 |
> |
register AMBVAL *av; |
179 |
|
/* do this node */ |
180 |
|
wsum = 0.0; |
181 |
|
for (av = at->alist; av != NULL; av = av->next) { |
254 |
|
register RAY *r; |
255 |
|
int al; |
256 |
|
{ |
257 |
< |
AMBVAL amb; |
257 |
> |
AMBVAL amb; |
258 |
|
FVECT gp, gd; |
259 |
|
/* compute weight */ |
260 |
|
amb.weight = pow(AVGREFL, (double)al); |
279 |
|
|
280 |
|
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
281 |
|
COLOR cr; |
282 |
< |
register AMBVAL *ap; |
282 |
> |
register AMBVAL *ap; |
283 |
|
FVECT pv, nv; |
284 |
|
{ |
285 |
|
FVECT v1, v2; |
286 |
|
register int i; |
287 |
< |
double d; |
287 |
> |
double d; |
288 |
|
|
289 |
|
d = 1.0; /* zeroeth order */ |
290 |
|
/* gradient due to translation */ |
309 |
|
{ |
310 |
|
extern char *progname, *octname, VersionID[]; |
311 |
|
|
312 |
+ |
#ifdef MSDOS |
313 |
+ |
setmode(fileno(ambfp), O_BINARY); |
314 |
+ |
#endif |
315 |
|
setbuf(ambfp, bmalloc(BUFSIZ)); |
316 |
|
if (creat) { /* new file */ |
317 |
|
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
325 |
|
fputformat(AMBFMT, ambfp); |
326 |
|
putc('\n', ambfp); |
327 |
|
putambmagic(ambfp); |
328 |
< |
fflush(ambfp); |
329 |
< |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
330 |
< |
error(USER, "bad ambient file"); |
328 |
> |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) { |
329 |
> |
sprintf(errmsg, "bad ambient file \"%s\"", ambfname); |
330 |
> |
error(USER, errmsg); |
331 |
> |
} |
332 |
|
} |
333 |
|
|
334 |
|
|
335 |
|
static |
336 |
|
avsave(av) /* insert and save an ambient value */ |
337 |
< |
AMBVAL *av; |
337 |
> |
AMBVAL *av; |
338 |
|
{ |
336 |
– |
static int nunflshed = 0; |
337 |
– |
|
339 |
|
avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
340 |
|
if (ambfp == NULL) |
341 |
|
return; |
342 |
|
if (writambval(av, ambfp) < 0) |
343 |
|
goto writerr; |
344 |
< |
if (++nunflshed >= AMBFLUSH) { |
344 |
> |
if (++nunflshed >= AMBFLUSH) |
345 |
|
if (ambsync() == EOF) |
346 |
|
goto writerr; |
346 |
– |
nunflshed = 0; |
347 |
– |
} |
347 |
|
return; |
348 |
|
writerr: |
349 |
< |
error(SYSTEM, "error writing ambient file"); |
349 |
> |
sprintf(errmsg, "error writing ambient file \"%s\"", ambfname); |
350 |
> |
error(SYSTEM, errmsg); |
351 |
|
} |
352 |
|
|
353 |
|
|
354 |
|
static |
355 |
|
avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
356 |
< |
AMBVAL *aval; |
356 |
> |
AMBVAL *aval; |
357 |
|
register AMBTREE *at; |
358 |
|
FVECT c0; |
359 |
< |
double s; |
359 |
> |
double s; |
360 |
|
{ |
361 |
|
FVECT ck0; |
362 |
|
int branch; |
363 |
< |
register AMBVAL *av; |
363 |
> |
register AMBVAL *av; |
364 |
|
register int i; |
365 |
|
|
366 |
|
if ((av = newambval()) == NULL) |
388 |
|
} |
389 |
|
|
390 |
|
|
391 |
< |
#ifdef NIX |
391 |
> |
#ifdef NIX |
392 |
|
|
393 |
< |
static |
393 |
> |
int |
394 |
|
ambsync() /* flush ambient file */ |
395 |
|
{ |
396 |
+ |
if (nunflshed == 0) |
397 |
+ |
return(0); |
398 |
+ |
nunflshed = 0; |
399 |
|
return(fflush(ambfp)); |
400 |
|
} |
401 |
|
|
402 |
|
#else |
403 |
|
|
404 |
< |
#include <fcntl.h> |
402 |
< |
#include <sys/types.h> |
403 |
< |
#include <sys/stat.h> |
404 |
< |
|
405 |
< |
static |
404 |
> |
int |
405 |
|
ambsync() /* synchronize ambient file */ |
406 |
|
{ |
407 |
|
static FILE *ambinp = NULL; |
408 |
+ |
static long lastpos = -1; |
409 |
|
struct flock fls; |
410 |
< |
struct stat sts; |
411 |
< |
AMBVAL avs; |
412 |
< |
long lastpos, flen; |
410 |
> |
long flen; |
411 |
> |
AMBVAL avs; |
412 |
|
register int n; |
413 |
+ |
|
414 |
+ |
if (nunflshed == 0) |
415 |
+ |
return(0); |
416 |
|
/* gain exclusive access */ |
417 |
|
fls.l_type = F_WRLCK; |
418 |
|
fls.l_whence = 0; |
420 |
|
fls.l_len = 0L; |
421 |
|
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
422 |
|
error(SYSTEM, "cannot lock ambient file"); |
423 |
+ |
if (lastpos < 0) /* initializing */ |
424 |
+ |
goto syncend; |
425 |
|
/* see if file has grown */ |
426 |
< |
lastpos = lseek(fileno(ambfp), 0L, 1); /* get previous position */ |
427 |
< |
if (fstat(fileno(ambfp), &sts) < 0) /* get current length */ |
428 |
< |
error(SYSTEM, "cannot stat ambient file"); |
429 |
< |
flen = sts.st_size; |
430 |
< |
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
431 |
< |
if (ambinp == NULL) /* use duplicate file */ |
432 |
< |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
433 |
< |
while (n--) { /* load contributed values */ |
426 |
> |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
427 |
> |
error(SYSTEM, "cannot seek on ambient file"); |
428 |
> |
if (n = flen - lastpos) { /* file has grown */ |
429 |
> |
if (ambinp == NULL) { |
430 |
> |
ambinp = fopen(ambfname, "r"); |
431 |
> |
if (ambinp == NULL) |
432 |
> |
error(SYSTEM, "fopen failed in ambsync"); |
433 |
> |
} |
434 |
> |
if (fseek(ambinp, lastpos, 0) < 0) |
435 |
> |
error(SYSTEM, "fseek failed in ambsync"); |
436 |
> |
while (n >= AMBVALSIZ) { /* load contributed values */ |
437 |
|
readambval(&avs, ambinp); |
438 |
|
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
439 |
< |
} /* moves shared file pointer */ |
440 |
< |
if (n = (flen - lastpos)%AMBVALSIZ) /* alignment */ |
439 |
> |
n -= AMBVALSIZ; |
440 |
> |
} |
441 |
> |
if (n) /* alignment */ |
442 |
|
lseek(fileno(ambfp), flen-n, 0); |
443 |
|
} |
444 |
+ |
syncend: |
445 |
|
n = fflush(ambfp); /* calls write() at last */ |
446 |
+ |
lastpos = lseek(fileno(ambfp), 0L, 1); |
447 |
|
fls.l_type = F_UNLCK; /* release file */ |
448 |
|
fcntl(fileno(ambfp), F_SETLKW, &fls); |
449 |
+ |
nunflshed = 0; |
450 |
|
return(n); |
451 |
|
} |
452 |
|
|