1 |
static const char RCSid[] = "$Id: ambient.c,v 2.113 2022/03/07 19:30:53 greg Exp $"; |
2 |
/* |
3 |
* ambient.c - routines dealing with ambient (inter-reflected) component. |
4 |
* |
5 |
* Declarations of external symbols in ambient.h |
6 |
*/ |
7 |
|
8 |
#include "copyright.h" |
9 |
|
10 |
#include <string.h> |
11 |
|
12 |
#include "platform.h" |
13 |
#include "ray.h" |
14 |
#include "otypes.h" |
15 |
#include "otspecial.h" |
16 |
#include "resolu.h" |
17 |
#include "ambient.h" |
18 |
#include "random.h" |
19 |
#include "pmapamb.h" |
20 |
|
21 |
#ifndef OCTSCALE |
22 |
#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */ |
23 |
#endif |
24 |
|
25 |
#ifndef MAXASET |
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#define MAXASET 4095 /* maximum number of elements in ambient set */ |
27 |
#endif |
28 |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
29 |
|
30 |
double maxarad; /* maximum ambient radius */ |
31 |
double minarad; /* minimum ambient radius */ |
32 |
|
33 |
static AMBTREE atrunk; /* our ambient trunk node */ |
34 |
|
35 |
static FILE *ambfp = NULL; /* ambient file pointer */ |
36 |
static int nunflshed = 0; /* number of unflushed ambient values */ |
37 |
|
38 |
static double avsum = 0.; /* computed ambient value sum (log) */ |
39 |
static unsigned int navsum = 0; /* number of values in avsum */ |
40 |
static unsigned int nambvals = 0; /* total number of indirect values */ |
41 |
static unsigned int nambshare = 0; /* number of values from file */ |
42 |
static FILE *ambinp = NULL; /* auxiliary file for input */ |
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static long lastpos = -1; /* last flush position */ |
44 |
|
45 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
46 |
|
47 |
#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL)) |
48 |
|
49 |
#define tfunc(lwr, x, upr) (((x)-(lwr))/((upr)-(lwr))) |
50 |
|
51 |
static void initambfile(int creat); |
52 |
static void avsave(AMBVAL *av); |
53 |
static AMBVAL *avstore(AMBVAL *aval); |
54 |
static AMBTREE *newambtree(void); |
55 |
static void freeambtree(AMBTREE *atp); |
56 |
|
57 |
typedef void unloadtf_t(AMBVAL *); |
58 |
static unloadtf_t avinsert; |
59 |
static unloadtf_t avfree; |
60 |
static void unloadatree(AMBTREE *at, unloadtf_t *f); |
61 |
|
62 |
static void sortambvals(void); |
63 |
|
64 |
static int plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang); |
65 |
static double sumambient(COLOR acol, RAY *r, FVECT rn, int al, |
66 |
AMBTREE *at, FVECT c0, double s); |
67 |
static int makeambient(COLOR acol, RAY *r, FVECT rn, int al); |
68 |
static int extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv, |
69 |
FVECT uvw[3]); |
70 |
|
71 |
#ifdef F_SETLKW |
72 |
static void aflock(int typ); |
73 |
#endif |
74 |
|
75 |
|
76 |
void |
77 |
setambres( /* set ambient resolution */ |
78 |
int ar |
79 |
) |
80 |
{ |
81 |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
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/* set min & max radii */ |
83 |
if (ar <= 0) { |
84 |
minarad = 0; |
85 |
maxarad = thescene.cusize*0.2; |
86 |
} else { |
87 |
minarad = thescene.cusize / ar; |
88 |
maxarad = 64.0 * minarad; /* heuristic */ |
89 |
if (maxarad > thescene.cusize*0.2) |
90 |
maxarad = thescene.cusize*0.2; |
91 |
} |
92 |
if (minarad <= FTINY) |
93 |
minarad = 10.0*FTINY; |
94 |
if (maxarad <= minarad) |
95 |
maxarad = 64.0 * minarad; |
96 |
} |
97 |
|
98 |
|
99 |
void |
100 |
setambacc( /* set ambient accuracy */ |
101 |
double newa |
102 |
) |
103 |
{ |
104 |
static double olda; /* remember previous setting here */ |
105 |
|
106 |
newa *= (newa > 0); |
107 |
if (fabs(newa - olda) >= .05*(newa + olda)) { |
108 |
ambacc = newa; |
109 |
if (ambacc > FTINY && nambvals > 0) |
110 |
sortambvals(); /* rebuild tree */ |
111 |
} |
112 |
} |
113 |
|
114 |
|
115 |
void |
116 |
setambient(void) /* initialize calculation */ |
117 |
{ |
118 |
int readonly = 0; |
119 |
long flen; |
120 |
AMBVAL amb; |
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/* make sure we're fresh */ |
122 |
ambdone(); |
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/* init ambient limits */ |
124 |
setambres(ambres); |
125 |
setambacc(ambacc); |
126 |
if (ambfile == NULL || !ambfile[0]) |
127 |
return; |
128 |
if (ambacc <= FTINY) { |
129 |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
130 |
ambfile); |
131 |
error(WARNING, errmsg); |
132 |
return; |
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} |
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/* open ambient file */ |
135 |
if ((ambfp = fopen(ambfile, "r+")) == NULL) |
136 |
readonly = (ambfp = fopen(ambfile, "r")) != NULL; |
137 |
if (ambfp != NULL) { |
138 |
initambfile(0); /* file exists */ |
139 |
lastpos = ftell(ambfp); |
140 |
while (readambval(&amb, ambfp)) |
141 |
avstore(&amb); |
142 |
nambshare = nambvals; /* share loaded values */ |
143 |
if (readonly) { |
144 |
sprintf(errmsg, |
145 |
"loaded %u values from read-only ambient file", |
146 |
nambvals); |
147 |
error(WARNING, errmsg); |
148 |
fclose(ambfp); /* close file so no writes */ |
149 |
ambfp = NULL; |
150 |
return; /* avoid ambsync() */ |
151 |
} |
152 |
/* align file pointer */ |
153 |
lastpos += (long)nambvals*AMBVALSIZ; |
154 |
flen = lseek(fileno(ambfp), (off_t)0, SEEK_END); |
155 |
if (flen != lastpos) { |
156 |
sprintf(errmsg, |
157 |
"ignoring last %ld values in ambient file (corrupted)", |
158 |
(flen - lastpos)/AMBVALSIZ); |
159 |
error(WARNING, errmsg); |
160 |
fseek(ambfp, lastpos, SEEK_SET); |
161 |
ftruncate(fileno(ambfp), (off_t)lastpos); |
162 |
} |
163 |
} else if ((ambfp = fopen(ambfile, "w+")) != NULL) { |
164 |
initambfile(1); /* else create new file */ |
165 |
fflush(ambfp); |
166 |
lastpos = ftell(ambfp); |
167 |
} else { |
168 |
sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile); |
169 |
error(SYSTEM, errmsg); |
170 |
} |
171 |
#ifdef F_SETLKW |
172 |
aflock(F_UNLCK); /* release file */ |
173 |
#endif |
174 |
} |
175 |
|
176 |
|
177 |
void |
178 |
ambdone(void) /* close ambient file and free memory */ |
179 |
{ |
180 |
if (ambfp != NULL) { /* close ambient file */ |
181 |
ambsync(); |
182 |
fclose(ambfp); |
183 |
ambfp = NULL; |
184 |
if (ambinp != NULL) { |
185 |
fclose(ambinp); |
186 |
ambinp = NULL; |
187 |
} |
188 |
lastpos = -1; |
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} |
190 |
/* free ambient tree */ |
191 |
unloadatree(&atrunk, avfree); |
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/* reset state variables */ |
193 |
avsum = 0.; |
194 |
navsum = 0; |
195 |
nambvals = 0; |
196 |
nambshare = 0; |
197 |
} |
198 |
|
199 |
|
200 |
void |
201 |
ambnotify( /* record new modifier */ |
202 |
OBJECT obj |
203 |
) |
204 |
{ |
205 |
static int hitlimit = 0; |
206 |
OBJREC *o; |
207 |
char **amblp; |
208 |
|
209 |
if (obj == OVOID) { /* starting over */ |
210 |
ambset[0] = 0; |
211 |
hitlimit = 0; |
212 |
return; |
213 |
} |
214 |
o = objptr(obj); |
215 |
if (hitlimit || !ismodifier(o->otype)) |
216 |
return; |
217 |
for (amblp = amblist; *amblp != NULL; amblp++) |
218 |
if (!strcmp(o->oname, *amblp)) { |
219 |
if (ambset[0] >= MAXASET) { |
220 |
error(WARNING, "too many modifiers in ambient list"); |
221 |
hitlimit++; |
222 |
return; /* should this be fatal? */ |
223 |
} |
224 |
insertelem(ambset, obj); |
225 |
return; |
226 |
} |
227 |
} |
228 |
|
229 |
|
230 |
void |
231 |
multambient( /* compute ambient component & multiply by coef. */ |
232 |
COLOR aval, |
233 |
RAY *r, |
234 |
FVECT nrm |
235 |
) |
236 |
{ |
237 |
static double logAvgAbsorp = 1; |
238 |
static int rdepth = 0; /* ambient recursion */ |
239 |
COLOR acol, caustic; |
240 |
int i, ok; |
241 |
double d, l; |
242 |
|
243 |
/* PMAP: Factor in ambient from photon map, if enabled and ray is |
244 |
* ambient. Return as all ambient components accounted for, else |
245 |
* continue. */ |
246 |
if (ambPmap(aval, r, rdepth)) |
247 |
return; |
248 |
|
249 |
if (logAvgAbsorp > 0) /* exclude in -aw to avoid growth */ |
250 |
logAvgAbsorp = log(1.-AVGREFL); |
251 |
|
252 |
/* PMAP: Factor in specular-diffuse ambient (caustics) from photon |
253 |
* map, if enabled and ray is primary, else caustic is zero. Continue |
254 |
* with RADIANCE ambient calculation */ |
255 |
copycolor(caustic, aval); |
256 |
ambPmapCaustic(caustic, r, rdepth); |
257 |
|
258 |
if (ambdiv <= 0) /* no ambient calculation */ |
259 |
goto dumbamb; |
260 |
/* check number of bounces */ |
261 |
if (rdepth >= ambounce) |
262 |
goto dumbamb; |
263 |
/* check ambient list */ |
264 |
if (ambincl != -1 && r->ro != NULL && |
265 |
ambincl != inset(ambset, r->ro->omod)) |
266 |
goto dumbamb; |
267 |
|
268 |
if (ambacc <= FTINY) { /* no ambient storage */ |
269 |
FVECT uvd[2]; |
270 |
float dgrad[2], *dgp = NULL; |
271 |
|
272 |
if (nrm != r->ron && DOT(nrm,r->ron) < 0.9999) |
273 |
dgp = dgrad; /* compute rotational grad. */ |
274 |
copycolor(acol, aval); |
275 |
rdepth++; |
276 |
ok = doambient(acol, r, r->rweight, |
277 |
uvd, NULL, NULL, dgp, NULL); |
278 |
rdepth--; |
279 |
if (!ok) |
280 |
goto dumbamb; |
281 |
if ((ok > 0) & (dgp != NULL)) { /* apply texture */ |
282 |
FVECT v1; |
283 |
VCROSS(v1, r->ron, nrm); |
284 |
d = 1.0; |
285 |
for (i = 3; i--; ) |
286 |
d += v1[i] * (dgp[0]*uvd[0][i] + dgp[1]*uvd[1][i]); |
287 |
if (d >= 0.05) |
288 |
scalecolor(acol, d); |
289 |
} |
290 |
copycolor(aval, acol); |
291 |
|
292 |
/* PMAP: add in caustic */ |
293 |
addcolor(aval, caustic); |
294 |
return; |
295 |
} |
296 |
/* interpolate ambient value */ |
297 |
setcolor(acol, 0.0, 0.0, 0.0); |
298 |
d = sumambient(acol, r, nrm, rdepth, |
299 |
&atrunk, thescene.cuorg, thescene.cusize); |
300 |
|
301 |
if (d > FTINY) { |
302 |
d = 1.0/d; |
303 |
scalecolor(acol, d); |
304 |
multcolor(aval, acol); |
305 |
|
306 |
/* PMAP: add in caustic */ |
307 |
addcolor(aval, caustic); |
308 |
return; |
309 |
} |
310 |
|
311 |
rdepth++; /* need to cache new value */ |
312 |
ok = makeambient(acol, r, nrm, rdepth-1); |
313 |
rdepth--; |
314 |
|
315 |
if (ok) { |
316 |
multcolor(aval, acol); /* computed new value */ |
317 |
|
318 |
/* PMAP: add in caustic */ |
319 |
addcolor(aval, caustic); |
320 |
return; |
321 |
} |
322 |
|
323 |
dumbamb: /* return global value */ |
324 |
if ((ambvwt <= 0) | (navsum == 0)) { |
325 |
multcolor(aval, ambval); |
326 |
|
327 |
/* PMAP: add in caustic */ |
328 |
addcolor(aval, caustic); |
329 |
return; |
330 |
} |
331 |
|
332 |
l = bright(ambval); /* average in computations */ |
333 |
if (l > FTINY) { |
334 |
d = (log(l)*(double)ambvwt + avsum + logAvgAbsorp*navsum) / |
335 |
(double)(ambvwt + navsum); |
336 |
d = exp(d) / l; |
337 |
scalecolor(aval, d); |
338 |
multcolor(aval, ambval); /* apply color of ambval */ |
339 |
} else { |
340 |
d = exp( avsum/(double)navsum + logAvgAbsorp ); |
341 |
scalecolor(aval, d); /* neutral color */ |
342 |
} |
343 |
} |
344 |
|
345 |
|
346 |
/* Plug a potential leak where ambient cache value is occluded */ |
347 |
static int |
348 |
plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang) |
349 |
{ |
350 |
const double cost70sq = 0.1169778; /* cos(70deg)^2 */ |
351 |
RAY rtst; |
352 |
FVECT vdif; |
353 |
double normdot, ndotd, nadotd; |
354 |
double a, b, c, t[2]; |
355 |
|
356 |
ang += 2.*PI*(ang < 0); /* check direction flags */ |
357 |
if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) ) |
358 |
return(0); |
359 |
/* |
360 |
* Generate test ray, targeting 20 degrees above sample point plane |
361 |
* along surface normal from cache position. This should be high |
362 |
* enough to miss local geometry we don't really care about. |
363 |
*/ |
364 |
VSUB(vdif, ap->pos, r->rop); |
365 |
normdot = DOT(anorm, r->ron); |
366 |
ndotd = DOT(vdif, r->ron); |
367 |
nadotd = DOT(vdif, anorm); |
368 |
a = normdot*normdot - cost70sq; |
369 |
b = 2.0*(normdot*ndotd - nadotd*cost70sq); |
370 |
c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq; |
371 |
if (quadratic(t, a, b, c) != 2) |
372 |
return(1); /* should rarely happen */ |
373 |
if (t[1] <= FTINY) |
374 |
return(0); /* should fail behind test */ |
375 |
rayorigin(&rtst, SHADOW, r, NULL); |
376 |
VSUM(rtst.rdir, vdif, anorm, t[1]); /* further dist. > plane */ |
377 |
rtst.rmax = normalize(rtst.rdir); /* short ray test */ |
378 |
while (localhit(&rtst, &thescene)) { /* check for occluder */ |
379 |
OBJREC *m = findmaterial(rtst.ro); |
380 |
if (m != NULL && !istransp(m->otype) && !isBSDFproxy(m) && |
381 |
(rtst.clipset == NULL || |
382 |
!inset(rtst.clipset, rtst.ro->omod))) |
383 |
return(1); /* plug light leak */ |
384 |
VCOPY(rtst.rorg, rtst.rop); /* skip invisible surface */ |
385 |
rtst.rmax -= rtst.rot; |
386 |
rayclear(&rtst); |
387 |
} |
388 |
return(0); /* seems we're OK */ |
389 |
} |
390 |
|
391 |
|
392 |
static double |
393 |
sumambient( /* get interpolated ambient value */ |
394 |
COLOR acol, |
395 |
RAY *r, |
396 |
FVECT rn, |
397 |
int al, |
398 |
AMBTREE *at, |
399 |
FVECT c0, |
400 |
double s |
401 |
) |
402 |
{ /* initial limit is 10 degrees plus ambacc radians */ |
403 |
const double minangle = 10.0 * PI/180.; |
404 |
double maxangle = minangle + ambacc; |
405 |
double wsum = 0.0; |
406 |
FVECT ck0; |
407 |
int i, j; |
408 |
AMBVAL *av; |
409 |
|
410 |
if (at->kid != NULL) { /* sum children first */ |
411 |
s *= 0.5; |
412 |
for (i = 0; i < 8; i++) { |
413 |
for (j = 0; j < 3; j++) { |
414 |
ck0[j] = c0[j]; |
415 |
if (1<<j & i) |
416 |
ck0[j] += s; |
417 |
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
418 |
break; |
419 |
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
420 |
break; |
421 |
} |
422 |
if (j == 3) |
423 |
wsum += sumambient(acol, r, rn, al, |
424 |
at->kid+i, ck0, s); |
425 |
} |
426 |
/* good enough? */ |
427 |
if (wsum >= 0.05 && s > minarad*10.0) |
428 |
return(wsum); |
429 |
} |
430 |
/* adjust maximum angle */ |
431 |
if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6)) |
432 |
maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.; |
433 |
/* sum this node */ |
434 |
for (av = at->alist; av != NULL; av = av->next) { |
435 |
double u, v, d, delta_r2, delta_t2; |
436 |
COLOR ct; |
437 |
FVECT uvw[3]; |
438 |
/* |
439 |
* Ambient level test |
440 |
*/ |
441 |
if (av->lvl > al || /* list sorted, so this works */ |
442 |
(av->lvl == al) & (av->weight < 0.9*r->rweight)) |
443 |
break; |
444 |
/* |
445 |
* Direction test using unperturbed normal |
446 |
*/ |
447 |
decodedir(uvw[2], av->ndir); |
448 |
d = DOT(uvw[2], r->ron); |
449 |
if (d <= 0.0) /* >= 90 degrees */ |
450 |
continue; |
451 |
delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */ |
452 |
if (delta_r2 >= maxangle*maxangle) |
453 |
continue; |
454 |
/* |
455 |
* Modified ray behind test |
456 |
*/ |
457 |
VSUB(ck0, r->rop, av->pos); |
458 |
d = DOT(ck0, uvw[2]); |
459 |
if (d < -minarad*ambacc-.001) |
460 |
continue; |
461 |
d /= av->rad[0]; |
462 |
delta_t2 = d*d; |
463 |
if (delta_t2 >= ambacc*ambacc) |
464 |
continue; |
465 |
/* |
466 |
* Elliptical radii test based on Hessian |
467 |
*/ |
468 |
decodedir(uvw[0], av->udir); |
469 |
VCROSS(uvw[1], uvw[2], uvw[0]); |
470 |
d = (u = DOT(ck0, uvw[0])) / av->rad[0]; |
471 |
delta_t2 += d*d; |
472 |
d = (v = DOT(ck0, uvw[1])) / av->rad[1]; |
473 |
delta_t2 += d*d; |
474 |
if (delta_t2 >= ambacc*ambacc) |
475 |
continue; |
476 |
/* |
477 |
* Test for potential light leak |
478 |
*/ |
479 |
if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u))) |
480 |
continue; |
481 |
/* |
482 |
* Extrapolate value and compute final weight (hat function) |
483 |
*/ |
484 |
if (!extambient(ct, av, r->rop, rn, uvw)) |
485 |
continue; |
486 |
d = tfunc(maxangle, sqrt(delta_r2), 0.0) * |
487 |
tfunc(ambacc, sqrt(delta_t2), 0.0); |
488 |
scalecolor(ct, d); |
489 |
addcolor(acol, ct); |
490 |
wsum += d; |
491 |
} |
492 |
return(wsum); |
493 |
} |
494 |
|
495 |
|
496 |
static int |
497 |
makeambient( /* make a new ambient value for storage */ |
498 |
COLOR acol, |
499 |
RAY *r, |
500 |
FVECT rn, |
501 |
int al |
502 |
) |
503 |
{ |
504 |
AMBVAL amb; |
505 |
FVECT uvw[3]; |
506 |
int i; |
507 |
|
508 |
amb.weight = 1.0; /* compute weight */ |
509 |
for (i = al; i-- > 0; ) |
510 |
amb.weight *= AVGREFL; |
511 |
if (r->rweight < 0.1*amb.weight) /* heuristic override */ |
512 |
amb.weight = 1.25*r->rweight; |
513 |
setcolor(acol, AVGREFL, AVGREFL, AVGREFL); |
514 |
/* compute ambient */ |
515 |
i = doambient(acol, r, amb.weight, |
516 |
uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral); |
517 |
scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */ |
518 |
if (i <= 0 || amb.rad[0] <= FTINY) /* no Hessian or zero radius */ |
519 |
return(i); |
520 |
/* store value */ |
521 |
VCOPY(amb.pos, r->rop); |
522 |
amb.ndir = encodedir(r->ron); |
523 |
amb.udir = encodedir(uvw[0]); |
524 |
amb.lvl = al; |
525 |
copycolor(amb.val, acol); |
526 |
/* insert into tree */ |
527 |
avsave(&amb); /* and save to file */ |
528 |
if (rn != r->ron) { /* texture */ |
529 |
VCOPY(uvw[2], r->ron); |
530 |
extambient(acol, &amb, r->rop, rn, uvw); |
531 |
} |
532 |
return(1); |
533 |
} |
534 |
|
535 |
|
536 |
static int |
537 |
extambient( /* extrapolate value at pv, nv */ |
538 |
COLOR cr, |
539 |
AMBVAL *ap, |
540 |
FVECT pv, |
541 |
FVECT nv, |
542 |
FVECT uvw[3] |
543 |
) |
544 |
{ |
545 |
const double min_d = 0.05; |
546 |
const double max_d = 20.; |
547 |
static FVECT my_uvw[3]; |
548 |
FVECT v1; |
549 |
int i; |
550 |
double d = 1.0; /* zeroeth order */ |
551 |
|
552 |
if (uvw == NULL) { /* need local coordinates? */ |
553 |
decodedir(my_uvw[2], ap->ndir); |
554 |
decodedir(my_uvw[0], ap->udir); |
555 |
VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]); |
556 |
uvw = my_uvw; |
557 |
} |
558 |
for (i = 3; i--; ) /* gradient due to translation */ |
559 |
d += (pv[i] - ap->pos[i]) * |
560 |
(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]); |
561 |
|
562 |
VCROSS(v1, uvw[2], nv); /* gradient due to rotation */ |
563 |
for (i = 3; i--; ) |
564 |
d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]); |
565 |
|
566 |
if (d < min_d) /* clamp min/max scaling */ |
567 |
d = min_d; |
568 |
else if (d > max_d) |
569 |
d = max_d; |
570 |
copycolor(cr, ap->val); |
571 |
scalecolor(cr, d); |
572 |
return(d > min_d); |
573 |
} |
574 |
|
575 |
|
576 |
static void |
577 |
avinsert( /* insert ambient value in our tree */ |
578 |
AMBVAL *av |
579 |
) |
580 |
{ |
581 |
AMBTREE *at; |
582 |
AMBVAL *ap; |
583 |
AMBVAL avh; |
584 |
FVECT ck0; |
585 |
double s; |
586 |
int branch; |
587 |
int i; |
588 |
|
589 |
if (av->rad[0] <= FTINY) |
590 |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
591 |
at = &atrunk; |
592 |
VCOPY(ck0, thescene.cuorg); |
593 |
s = thescene.cusize; |
594 |
while (s*(OCTSCALE/2) > av->rad[1]*ambacc) { |
595 |
if (at->kid == NULL) |
596 |
if ((at->kid = newambtree()) == NULL) |
597 |
error(SYSTEM, "out of memory in avinsert"); |
598 |
s *= 0.5; |
599 |
branch = 0; |
600 |
for (i = 0; i < 3; i++) |
601 |
if (av->pos[i] > ck0[i] + s) { |
602 |
ck0[i] += s; |
603 |
branch |= 1 << i; |
604 |
} |
605 |
at = at->kid + branch; |
606 |
} |
607 |
avh.next = at->alist; /* order by increasing level */ |
608 |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
609 |
if ( ap->next->lvl > av->lvl || |
610 |
(ap->next->lvl == av->lvl) & |
611 |
(ap->next->weight <= av->weight) ) |
612 |
break; |
613 |
av->next = ap->next; |
614 |
ap->next = (AMBVAL*)av; |
615 |
at->alist = avh.next; |
616 |
} |
617 |
|
618 |
|
619 |
static void |
620 |
initambfile( /* initialize ambient file */ |
621 |
int cre8 |
622 |
) |
623 |
{ |
624 |
extern char *progname, *octname; |
625 |
static char *mybuf = NULL; |
626 |
|
627 |
#ifdef F_SETLKW |
628 |
aflock(cre8 ? F_WRLCK : F_RDLCK); |
629 |
#endif |
630 |
SET_FILE_BINARY(ambfp); |
631 |
if (mybuf == NULL) |
632 |
mybuf = (char *)bmalloc(BUFSIZ+8); |
633 |
setbuf(ambfp, mybuf); |
634 |
if (cre8) { /* new file */ |
635 |
newheader("RADIANCE", ambfp); |
636 |
fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ", |
637 |
progname, colval(ambval,RED), |
638 |
colval(ambval,GRN), colval(ambval,BLU), |
639 |
ambvwt, ambounce, ambacc); |
640 |
fprintf(ambfp, "-ad %d -as %d -ar %d ", |
641 |
ambdiv, ambssamp, ambres); |
642 |
fprintf(ambfp, "-dt %g -dc %g -ss %g -lr %d -lw %g ", |
643 |
shadthresh, shadcert, specjitter, |
644 |
maxdepth, minweight); |
645 |
if (octname != NULL) |
646 |
fputs(octname, ambfp); |
647 |
fputc('\n', ambfp); |
648 |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
649 |
fputnow(ambfp); |
650 |
fputformat(AMBFMT, ambfp); |
651 |
fputc('\n', ambfp); |
652 |
putambmagic(ambfp); |
653 |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
654 |
error(USER, "bad ambient file"); |
655 |
} |
656 |
|
657 |
|
658 |
static void |
659 |
avsave( /* insert and save an ambient value */ |
660 |
AMBVAL *av |
661 |
) |
662 |
{ |
663 |
avstore(av); |
664 |
if (ambfp == NULL) |
665 |
return; |
666 |
if (writambval(av, ambfp) < 0) |
667 |
goto writerr; |
668 |
if (++nunflshed >= AMBFLUSH) |
669 |
if (ambsync() == EOF) |
670 |
goto writerr; |
671 |
return; |
672 |
writerr: |
673 |
error(SYSTEM, "error writing to ambient file"); |
674 |
} |
675 |
|
676 |
|
677 |
static AMBVAL * |
678 |
avstore( /* allocate memory and save aval */ |
679 |
AMBVAL *aval |
680 |
) |
681 |
{ |
682 |
AMBVAL *av; |
683 |
double d; |
684 |
|
685 |
if ((av = newambval()) == NULL) |
686 |
error(SYSTEM, "out of memory in avstore"); |
687 |
*av = *aval; |
688 |
av->next = NULL; |
689 |
nambvals++; |
690 |
d = bright(av->val); |
691 |
if (d > FTINY) { /* add to log sum for averaging */ |
692 |
avsum += log(d); |
693 |
navsum++; |
694 |
} |
695 |
avinsert(av); /* insert in our cache tree */ |
696 |
return(av); |
697 |
} |
698 |
|
699 |
|
700 |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
701 |
|
702 |
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
703 |
|
704 |
|
705 |
static AMBTREE * |
706 |
newambtree(void) /* allocate 8 ambient tree structs */ |
707 |
{ |
708 |
AMBTREE *atp, *upperlim; |
709 |
|
710 |
if (atfreelist == NULL) { /* get more nodes */ |
711 |
atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
712 |
if (atfreelist == NULL) |
713 |
return(NULL); |
714 |
/* link new free list */ |
715 |
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
716 |
for (atp = atfreelist; atp < upperlim; atp += 8) |
717 |
atp->kid = atp + 8; |
718 |
atp->kid = NULL; |
719 |
} |
720 |
atp = atfreelist; |
721 |
atfreelist = atp->kid; |
722 |
memset(atp, 0, 8*sizeof(AMBTREE)); |
723 |
return(atp); |
724 |
} |
725 |
|
726 |
|
727 |
static void |
728 |
freeambtree( /* free 8 ambient tree structs */ |
729 |
AMBTREE *atp |
730 |
) |
731 |
{ |
732 |
atp->kid = atfreelist; |
733 |
atfreelist = atp; |
734 |
} |
735 |
|
736 |
|
737 |
static void |
738 |
unloadatree( /* unload an ambient value tree */ |
739 |
AMBTREE *at, |
740 |
unloadtf_t *f |
741 |
) |
742 |
{ |
743 |
AMBVAL *av; |
744 |
int i; |
745 |
/* transfer values at this node */ |
746 |
for (av = at->alist; av != NULL; av = at->alist) { |
747 |
at->alist = av->next; |
748 |
av->next = NULL; |
749 |
(*f)(av); |
750 |
} |
751 |
if (at->kid == NULL) |
752 |
return; |
753 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
754 |
unloadatree(at->kid+i, f); |
755 |
freeambtree(at->kid); |
756 |
at->kid = NULL; |
757 |
} |
758 |
|
759 |
|
760 |
static void |
761 |
avfree(AMBVAL *av) |
762 |
{ |
763 |
free(av); |
764 |
} |
765 |
|
766 |
|
767 |
static void |
768 |
sortambvals(void) /* resort ambient values */ |
769 |
{ |
770 |
AMBTREE oldatrunk = atrunk; |
771 |
|
772 |
atrunk.alist = NULL; |
773 |
atrunk.kid = NULL; |
774 |
unloadatree(&oldatrunk, avinsert); |
775 |
} |
776 |
|
777 |
|
778 |
#ifdef F_SETLKW |
779 |
|
780 |
static void |
781 |
aflock( /* lock/unlock ambient file */ |
782 |
int typ |
783 |
) |
784 |
{ |
785 |
static struct flock fls; /* static so initialized to zeroes */ |
786 |
|
787 |
if (typ == fls.l_type) /* already called? */ |
788 |
return; |
789 |
|
790 |
fls.l_type = typ; |
791 |
do |
792 |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) != -1) |
793 |
return; |
794 |
while (errno == EINTR); |
795 |
|
796 |
error(SYSTEM, "cannot (un)lock ambient file"); |
797 |
} |
798 |
|
799 |
|
800 |
int |
801 |
ambsync(void) /* synchronize ambient file */ |
802 |
{ |
803 |
long flen; |
804 |
AMBVAL avs; |
805 |
int n; |
806 |
|
807 |
if (ambfp == NULL) /* no ambient file? */ |
808 |
return(0); |
809 |
/* gain appropriate access */ |
810 |
aflock(nunflshed ? F_WRLCK : F_RDLCK); |
811 |
/* see if file has grown */ |
812 |
if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0) |
813 |
goto seekerr; |
814 |
if ((n = flen - lastpos) > 0) { /* file has grown */ |
815 |
if (ambinp == NULL) { /* get new file pointer */ |
816 |
ambinp = fopen(ambfile, "rb"); |
817 |
if (ambinp == NULL) |
818 |
error(SYSTEM, "fopen failed in ambsync"); |
819 |
} |
820 |
if (fseek(ambinp, lastpos, SEEK_SET) < 0) |
821 |
goto seekerr; |
822 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
823 |
if (!readambval(&avs, ambinp)) { |
824 |
sprintf(errmsg, |
825 |
"ambient file \"%s\" corrupted near character %ld", |
826 |
ambfile, flen - n); |
827 |
error(WARNING, errmsg); |
828 |
break; |
829 |
} |
830 |
avstore(&avs); |
831 |
n -= AMBVALSIZ; |
832 |
} |
833 |
lastpos = flen - n; /* check alignment */ |
834 |
if (n && lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0) |
835 |
goto seekerr; |
836 |
} |
837 |
n = fflush(ambfp); /* calls write() at last */ |
838 |
lastpos += (long)nunflshed*AMBVALSIZ; |
839 |
aflock(F_UNLCK); /* release file */ |
840 |
nunflshed = 0; |
841 |
return(n); |
842 |
seekerr: |
843 |
error(SYSTEM, "seek failed in ambsync"); |
844 |
return(EOF); /* pro forma return */ |
845 |
} |
846 |
|
847 |
#else /* ! F_SETLKW */ |
848 |
|
849 |
int |
850 |
ambsync(void) /* flush ambient file */ |
851 |
{ |
852 |
if (ambfp == NULL) |
853 |
return(0); |
854 |
nunflshed = 0; |
855 |
return(fflush(ambfp)); |
856 |
} |
857 |
|
858 |
#endif /* ! F_SETLKW */ |