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 |
|
|
46 |
+ |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
47 |
+ |
|
48 |
|
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
49 |
|
|
50 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
51 |
|
|
52 |
+ |
extern long ftell(), lseek(); |
53 |
|
|
54 |
+ |
|
55 |
+ |
setambres(ar) /* set ambient resolution */ |
56 |
+ |
int ar; |
57 |
+ |
{ |
58 |
+ |
/* set min & max radii */ |
59 |
+ |
if (ar <= 0) { |
60 |
+ |
minarad = 0.0; |
61 |
+ |
maxarad = thescene.cusize / 2.0; |
62 |
+ |
} else { |
63 |
+ |
minarad = thescene.cusize / ar; |
64 |
+ |
maxarad = 16.0 * minarad; /* heuristic */ |
65 |
+ |
if (maxarad > thescene.cusize / 2.0) |
66 |
+ |
maxarad = thescene.cusize / 2.0; |
67 |
+ |
} |
68 |
+ |
if (maxarad <= FTINY) |
69 |
+ |
maxarad = .001; |
70 |
+ |
} |
71 |
+ |
|
72 |
+ |
|
73 |
|
setambient(afile) /* initialize calculation */ |
74 |
|
char *afile; |
75 |
|
{ |
76 |
< |
long ftell(); |
76 |
> |
long headlen; |
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 |
> |
headlen = ftell(ambfp); |
85 |
> |
while (readambval(&amb, ambfp)) |
86 |
|
avinsert(&amb, &atrunk, thescene.cuorg, |
87 |
|
thescene.cusize); |
88 |
|
/* align */ |
89 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); |
90 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
89 |
> |
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
90 |
> |
} else if ((ambfp = fopen(afile, "w")) != NULL) |
91 |
> |
initambfile(1); |
92 |
> |
else { |
93 |
|
sprintf(errmsg, "cannot open ambient file \"%s\"", |
94 |
|
afile); |
95 |
|
error(SYSTEM, errmsg); |
124 |
|
register RAY *r; |
125 |
|
{ |
126 |
|
static int rdepth = 0; /* ambient recursion */ |
127 |
< |
double wsum; |
127 |
> |
double d; |
128 |
|
|
105 |
– |
rdepth++; /* increment level */ |
106 |
– |
|
129 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
130 |
|
goto dumbamb; |
131 |
|
/* check number of bounces */ |
132 |
< |
if (rdepth > ambounce) |
132 |
> |
if (rdepth >= ambounce) |
133 |
|
goto dumbamb; |
134 |
|
/* check ambient list */ |
135 |
|
if (ambincl != -1 && r->ro != NULL && |
137 |
|
goto dumbamb; |
138 |
|
|
139 |
|
if (ambacc <= FTINY) { /* no ambient storage */ |
140 |
< |
if (doambient(acol, r, NULL, NULL) == 0.0) |
140 |
> |
rdepth++; |
141 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
142 |
> |
rdepth--; |
143 |
> |
if (d == 0.0) |
144 |
|
goto dumbamb; |
145 |
< |
goto done; |
145 |
> |
return; |
146 |
|
} |
147 |
|
/* get ambient value */ |
148 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
149 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
150 |
< |
if (wsum > FTINY) |
151 |
< |
scalecolor(acol, 1.0/wsum); |
152 |
< |
else if (makeambient(acol, r) == 0.0) |
153 |
< |
goto dumbamb; |
154 |
< |
goto done; |
155 |
< |
|
149 |
> |
d = sumambient(acol, r, rdepth, |
150 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
151 |
> |
if (d > FTINY) |
152 |
> |
scalecolor(acol, 1.0/d); |
153 |
> |
else { |
154 |
> |
d = makeambient(acol, r, rdepth++); |
155 |
> |
rdepth--; |
156 |
> |
} |
157 |
> |
if (d > FTINY) |
158 |
> |
return; |
159 |
|
dumbamb: /* return global value */ |
160 |
|
copycolor(acol, ambval); |
133 |
– |
done: /* must finish here! */ |
134 |
– |
rdepth--; |
161 |
|
} |
162 |
|
|
163 |
|
|
164 |
|
double |
165 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
165 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
166 |
|
COLOR acol; |
167 |
|
register RAY *r; |
168 |
+ |
int al; |
169 |
|
AMBTREE *at; |
170 |
|
FVECT c0; |
171 |
|
double s; |
181 |
|
wsum = 0.0; |
182 |
|
for (av = at->alist; av != NULL; av = av->next) { |
183 |
|
/* |
184 |
< |
* Ray strength test. |
184 |
> |
* Ambient level test. |
185 |
|
*/ |
186 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
186 |
> |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
187 |
|
continue; |
188 |
|
/* |
189 |
|
* Ambient radius test. |
210 |
|
for (j = 0; j < 3; j++) |
211 |
|
d += (r->rop[j] - av->pos[j]) * |
212 |
|
(av->dir[j] + r->ron[j]); |
213 |
< |
if (d*0.5 < -minarad*ambacc) |
213 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
214 |
|
continue; |
215 |
|
/* |
216 |
|
* Jittering final test reduces image artifacts. |
217 |
|
*/ |
218 |
|
wt = sqrt(e1) + sqrt(e2); |
219 |
< |
wt *= .9 + .2*frandom(); |
219 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
220 |
|
if (wt > ambacc) |
221 |
|
continue; |
222 |
|
if (wt <= 1e-3) |
224 |
|
else |
225 |
|
wt = 1.0 / wt; |
226 |
|
wsum += wt; |
227 |
< |
copycolor(ct, av->val); |
227 |
> |
extambient(ct, av, r->rop, r->ron); |
228 |
|
scalecolor(ct, wt); |
229 |
|
addcolor(acol, ct); |
230 |
|
} |
243 |
|
break; |
244 |
|
} |
245 |
|
if (j == 3) |
246 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
246 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
247 |
|
} |
248 |
|
return(wsum); |
249 |
|
} |
250 |
|
|
251 |
|
|
252 |
|
double |
253 |
< |
makeambient(acol, r) /* make a new ambient value */ |
253 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
254 |
|
COLOR acol; |
255 |
|
register RAY *r; |
256 |
+ |
int al; |
257 |
|
{ |
258 |
|
AMBVAL amb; |
259 |
|
FVECT gp, gd; |
260 |
< |
|
261 |
< |
amb.rad = doambient(acol, r, gp, gd); /* compute ambient */ |
260 |
> |
/* compute weight */ |
261 |
> |
amb.weight = pow(AVGREFL, (double)al); |
262 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
263 |
> |
amb.weight = r->rweight; |
264 |
> |
/* compute ambient */ |
265 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
266 |
|
if (amb.rad == 0.0) |
267 |
|
return(0.0); |
268 |
|
/* store it */ |
269 |
|
VCOPY(amb.pos, r->rop); |
270 |
|
VCOPY(amb.dir, r->ron); |
271 |
< |
amb.lvl = r->rlvl; |
240 |
< |
amb.weight = r->rweight; |
271 |
> |
amb.lvl = al; |
272 |
|
copycolor(amb.val, acol); |
273 |
|
VCOPY(amb.gpos, gp); |
274 |
|
VCOPY(amb.gdir, gd); |
275 |
|
/* insert into tree */ |
276 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
246 |
< |
avsave(&amb); /* write to file */ |
276 |
> |
avsave(&amb); /* and save to file */ |
277 |
|
return(amb.rad); |
278 |
|
} |
279 |
|
|
280 |
|
|
281 |
+ |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
282 |
+ |
COLOR cr; |
283 |
+ |
register AMBVAL *ap; |
284 |
+ |
FVECT pv, nv; |
285 |
+ |
{ |
286 |
+ |
FVECT v1, v2; |
287 |
+ |
register int i; |
288 |
+ |
double d; |
289 |
+ |
|
290 |
+ |
d = 1.0; /* zeroeth order */ |
291 |
+ |
/* gradient due to translation */ |
292 |
+ |
for (i = 0; i < 3; i++) |
293 |
+ |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
294 |
+ |
/* gradient due to rotation */ |
295 |
+ |
VCOPY(v1, ap->dir); |
296 |
+ |
fcross(v2, v1, nv); |
297 |
+ |
d += DOT(ap->gdir, v2); |
298 |
+ |
if (d <= 0.0) { |
299 |
+ |
setcolor(cr, 0.0, 0.0, 0.0); |
300 |
+ |
return; |
301 |
+ |
} |
302 |
+ |
copycolor(cr, ap->val); |
303 |
+ |
scalecolor(cr, d); |
304 |
+ |
} |
305 |
+ |
|
306 |
+ |
|
307 |
|
static |
308 |
< |
avsave(av) /* save an ambient value */ |
308 |
> |
initambfile(creat) /* initialize ambient file */ |
309 |
> |
int creat; |
310 |
> |
{ |
311 |
> |
extern char *progname, *octname, VersionID[]; |
312 |
> |
|
313 |
> |
setbuf(ambfp, bmalloc(BUFSIZ)); |
314 |
> |
if (creat) { /* new file */ |
315 |
> |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
316 |
> |
progname, colval(ambval,RED), |
317 |
> |
colval(ambval,GRN), colval(ambval,BLU), |
318 |
> |
ambounce, ambacc); |
319 |
> |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
320 |
> |
ambdiv, ambssamp, ambres, |
321 |
> |
octname==NULL ? "" : octname); |
322 |
> |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
323 |
> |
fputformat(AMBFMT, ambfp); |
324 |
> |
putc('\n', ambfp); |
325 |
> |
putambmagic(ambfp); |
326 |
> |
fflush(ambfp); |
327 |
> |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 |
328 |
> |
|| !hasambmagic(ambfp)) { |
329 |
> |
sprintf(errmsg, "\"%s\" is not an ambient file", afname); |
330 |
> |
error(USER, errmsg); |
331 |
> |
} |
332 |
> |
} |
333 |
> |
|
334 |
> |
|
335 |
> |
static |
336 |
> |
avsave(av) /* insert and save an ambient value */ |
337 |
|
AMBVAL *av; |
338 |
|
{ |
255 |
– |
#ifdef AMBFLUSH |
339 |
|
static int nunflshed = 0; |
340 |
< |
#endif |
340 |
> |
|
341 |
> |
avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
342 |
|
if (ambfp == NULL) |
343 |
|
return; |
344 |
< |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
344 |
> |
if (writambval(av, ambfp) < 0) |
345 |
|
goto writerr; |
262 |
– |
#ifdef AMBFLUSH |
346 |
|
if (++nunflshed >= AMBFLUSH) { |
347 |
< |
if (fflush(ambfp) == EOF) |
347 |
> |
if (ambsync() == EOF) |
348 |
|
goto writerr; |
349 |
|
nunflshed = 0; |
350 |
|
} |
268 |
– |
#endif |
351 |
|
return; |
352 |
|
writerr: |
353 |
|
error(SYSTEM, "error writing ambient file"); |
388 |
|
return; |
389 |
|
memerr: |
390 |
|
error(SYSTEM, "out of memory in avinsert"); |
391 |
+ |
} |
392 |
+ |
|
393 |
+ |
|
394 |
+ |
#include <fcntl.h> |
395 |
+ |
|
396 |
+ |
|
397 |
+ |
static |
398 |
+ |
ambsync() /* synchronize ambient file */ |
399 |
+ |
{ |
400 |
+ |
static FILE *ambinp = NULL; |
401 |
+ |
struct flock fls; |
402 |
+ |
AMBVAL avs; |
403 |
+ |
long lastpos, flen; |
404 |
+ |
register int n; |
405 |
+ |
/* gain exclusive access */ |
406 |
+ |
fls.l_type = F_WRLCK; |
407 |
+ |
fls.l_whence = 0; |
408 |
+ |
fls.l_start = 0L; |
409 |
+ |
fls.l_len = 0L; |
410 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
411 |
+ |
error(SYSTEM, "cannot lock ambient file"); |
412 |
+ |
/* see if file has grown */ |
413 |
+ |
lastpos = lseek(fileno(ambfp), 0L, 1); /* get previous position */ |
414 |
+ |
flen = lseek(fileno(ambfp), 0L, 2); /* new(?) file length */ |
415 |
+ |
if (n = (flen - lastpos)%AMBVALSIZ) /* assure alignment */ |
416 |
+ |
lseek(fileno(ambfp), (long)-n, 1); |
417 |
+ |
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
418 |
+ |
if (ambinp == NULL && (ambinp = fopen(afname, "r")) == NULL) |
419 |
+ |
error(SYSTEM, "cannot reopen ambient file"); |
420 |
+ |
fseek(ambinp, lastpos, 0); /* go to previous position */ |
421 |
+ |
while (n--) { /* load contributed values */ |
422 |
+ |
readambval(&avs, ambinp); |
423 |
+ |
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
424 |
+ |
} |
425 |
+ |
} |
426 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
427 |
+ |
fls.l_type = F_UNLCK; /* release file */ |
428 |
+ |
fcntl(fileno(ambfp), F_SETLKW, &fls); |
429 |
+ |
return(n); |
430 |
|
} |