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 |
+ |
{ |
59 |
+ |
/* set min & max radii */ |
60 |
+ |
if (ar <= 0) { |
61 |
+ |
minarad = 0.0; |
62 |
+ |
maxarad = thescene.cusize / 2.0; |
63 |
+ |
} else { |
64 |
+ |
minarad = thescene.cusize / ar; |
65 |
+ |
maxarad = 16.0 * minarad; /* heuristic */ |
66 |
+ |
if (maxarad > thescene.cusize / 2.0) |
67 |
+ |
maxarad = thescene.cusize / 2.0; |
68 |
+ |
} |
69 |
+ |
if (maxarad <= FTINY) |
70 |
+ |
maxarad = .001; |
71 |
+ |
} |
72 |
+ |
|
73 |
+ |
|
74 |
|
setambient(afile) /* initialize calculation */ |
75 |
|
char *afile; |
76 |
|
{ |
53 |
– |
long ftell(); |
77 |
|
AMBVAL amb; |
78 |
< |
|
79 |
< |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
80 |
< |
/* minimum radius */ |
81 |
< |
minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
59 |
< |
|
60 |
< |
/* open ambient file */ |
61 |
< |
if (afile != NULL) |
78 |
> |
/* init ambient limits */ |
79 |
> |
setambres(ambres); |
80 |
> |
/* open ambient file */ |
81 |
> |
if ((afname = afile) != NULL) |
82 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
83 |
< |
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
83 |
> |
initambfile(0); |
84 |
> |
while (readambval(&amb, ambfp)) |
85 |
|
avinsert(&amb, &atrunk, thescene.cuorg, |
86 |
|
thescene.cusize); |
87 |
|
/* align */ |
88 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 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 |
|
{ |
150 |
|
register RAY *r; |
151 |
|
{ |
152 |
|
static int rdepth = 0; /* ambient recursion */ |
153 |
< |
double wsum; |
153 |
> |
double d; |
154 |
|
|
105 |
– |
rdepth++; /* increment level */ |
106 |
– |
|
155 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
156 |
|
goto dumbamb; |
157 |
|
/* check number of bounces */ |
158 |
< |
if (rdepth > ambounce) |
158 |
> |
if (rdepth >= ambounce) |
159 |
|
goto dumbamb; |
160 |
|
/* check ambient list */ |
161 |
|
if (ambincl != -1 && r->ro != NULL && |
163 |
|
goto dumbamb; |
164 |
|
|
165 |
|
if (ambacc <= FTINY) { /* no ambient storage */ |
166 |
< |
if (doambient(acol, r, NULL, NULL) == 0.0) |
166 |
> |
rdepth++; |
167 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
168 |
> |
rdepth--; |
169 |
> |
if (d == 0.0) |
170 |
|
goto dumbamb; |
171 |
< |
goto done; |
171 |
> |
return; |
172 |
|
} |
173 |
|
/* get ambient value */ |
174 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
175 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
176 |
< |
if (wsum > FTINY) |
177 |
< |
scalecolor(acol, 1.0/wsum); |
178 |
< |
else if (makeambient(acol, r) == 0.0) |
179 |
< |
goto dumbamb; |
180 |
< |
goto done; |
181 |
< |
|
175 |
> |
d = sumambient(acol, r, rdepth, |
176 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
177 |
> |
if (d > FTINY) |
178 |
> |
scalecolor(acol, 1.0/d); |
179 |
> |
else { |
180 |
> |
d = makeambient(acol, r, rdepth++); |
181 |
> |
rdepth--; |
182 |
> |
} |
183 |
> |
if (d > FTINY) |
184 |
> |
return; |
185 |
|
dumbamb: /* return global value */ |
186 |
|
copycolor(acol, ambval); |
133 |
– |
done: /* must finish here! */ |
134 |
– |
rdepth--; |
187 |
|
} |
188 |
|
|
189 |
|
|
190 |
|
double |
191 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
191 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
192 |
|
COLOR acol; |
193 |
|
register RAY *r; |
194 |
+ |
int al; |
195 |
|
AMBTREE *at; |
196 |
|
FVECT c0; |
197 |
|
double s; |
207 |
|
wsum = 0.0; |
208 |
|
for (av = at->alist; av != NULL; av = av->next) { |
209 |
|
/* |
210 |
< |
* Ray strength test. |
210 |
> |
* Ambient level test. |
211 |
|
*/ |
212 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
212 |
> |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
213 |
|
continue; |
214 |
|
/* |
215 |
|
* Ambient radius test. |
236 |
|
for (j = 0; j < 3; j++) |
237 |
|
d += (r->rop[j] - av->pos[j]) * |
238 |
|
(av->dir[j] + r->ron[j]); |
239 |
< |
if (d*0.5 < -minarad*ambacc) |
239 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
240 |
|
continue; |
241 |
|
/* |
242 |
|
* Jittering final test reduces image artifacts. |
243 |
|
*/ |
244 |
|
wt = sqrt(e1) + sqrt(e2); |
245 |
< |
wt *= .9 + .2*frandom(); |
245 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
246 |
|
if (wt > ambacc) |
247 |
|
continue; |
248 |
|
if (wt <= 1e-3) |
269 |
|
break; |
270 |
|
} |
271 |
|
if (j == 3) |
272 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
272 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
273 |
|
} |
274 |
|
return(wsum); |
275 |
|
} |
276 |
|
|
277 |
|
|
278 |
|
double |
279 |
< |
makeambient(acol, r) /* make a new ambient value */ |
279 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
280 |
|
COLOR acol; |
281 |
|
register RAY *r; |
282 |
+ |
int al; |
283 |
|
{ |
284 |
|
AMBVAL amb; |
285 |
|
FVECT gp, gd; |
286 |
< |
|
287 |
< |
amb.rad = doambient(acol, r, gp, gd); /* compute ambient */ |
286 |
> |
/* compute weight */ |
287 |
> |
amb.weight = pow(AVGREFL, (double)al); |
288 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
289 |
> |
amb.weight = r->rweight; |
290 |
> |
/* compute ambient */ |
291 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
292 |
|
if (amb.rad == 0.0) |
293 |
|
return(0.0); |
294 |
|
/* store it */ |
295 |
|
VCOPY(amb.pos, r->rop); |
296 |
|
VCOPY(amb.dir, r->ron); |
297 |
< |
amb.lvl = r->rlvl; |
240 |
< |
amb.weight = r->rweight; |
297 |
> |
amb.lvl = al; |
298 |
|
copycolor(amb.val, acol); |
299 |
|
VCOPY(amb.gpos, gp); |
300 |
|
VCOPY(amb.gdir, gd); |
301 |
|
/* insert into tree */ |
302 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
246 |
< |
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 |
|
{ |
281 |
– |
#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 (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
342 |
> |
if (writambval(av, ambfp) < 0) |
343 |
|
goto writerr; |
288 |
– |
#ifdef AMBFLUSH |
344 |
|
if (++nunflshed >= AMBFLUSH) { |
345 |
< |
if (fflush(ambfp) == EOF) |
345 |
> |
if (ambsync() == EOF) |
346 |
|
goto writerr; |
347 |
|
nunflshed = 0; |
348 |
|
} |
294 |
– |
#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 |
|
} |