1 |
static const char RCSid[] = "$Id: ambient.c,v 2.125 2024/11/11 19:01:55 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 |
26 |
#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 */ |
43 |
static long lastpos = -1; /* last flush position */ |
44 |
|
45 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
46 |
|
47 |
#define AVSIZE (sizeof(AMBVAL)-sizeof(SCOLOR)+sizeof(COLORV)*NCSAMP) |
48 |
#define newambval() (AMBVAL *)malloc(AVSIZE) |
49 |
|
50 |
#define tfunc(x0, x, x1) (((x)-(x0))/((x1)-(x0))) |
51 |
|
52 |
static void initambfile(int cre8); |
53 |
static void avsave(AMBVAL *av); |
54 |
static AMBVAL *avstore(AMBVAL *aval); |
55 |
static AMBTREE *newambtree(void); |
56 |
static void freeambtree(AMBTREE *atp); |
57 |
|
58 |
typedef void unloadtf_t(AMBVAL *); |
59 |
static unloadtf_t avinsert; |
60 |
static unloadtf_t avfree; |
61 |
static void unloadatree(AMBTREE *at, unloadtf_t *f); |
62 |
|
63 |
static void sortambvals(void); |
64 |
|
65 |
static int plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang); |
66 |
static double sumambient(SCOLOR acol, RAY *r, FVECT rn, int al, |
67 |
AMBTREE *at, FVECT c0, double s); |
68 |
static int makeambient(SCOLOR acol, RAY *r, FVECT rn, int al); |
69 |
static int extambient(SCOLOR cr, AMBVAL *ap, FVECT pv, FVECT nv, |
70 |
FVECT uvw[3]); |
71 |
|
72 |
#ifdef F_SETLKW |
73 |
static void aflock(int typ); |
74 |
#endif |
75 |
|
76 |
|
77 |
void |
78 |
setambres( /* set ambient resolution */ |
79 |
int ar |
80 |
) |
81 |
{ |
82 |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
83 |
/* set min & max radii */ |
84 |
if (ar <= 0) { |
85 |
minarad = 0; |
86 |
maxarad = thescene.cusize*0.2; |
87 |
} else { |
88 |
minarad = thescene.cusize / ar; |
89 |
maxarad = 64.0 * minarad; /* heuristic */ |
90 |
if (maxarad > thescene.cusize*0.2) |
91 |
maxarad = thescene.cusize*0.2; |
92 |
} |
93 |
if (minarad <= FTINY) |
94 |
minarad = 10.0*FTINY; |
95 |
if (maxarad <= minarad) |
96 |
maxarad = 64.0 * minarad; |
97 |
} |
98 |
|
99 |
|
100 |
void |
101 |
setambacc( /* set ambient accuracy */ |
102 |
double newa |
103 |
) |
104 |
{ |
105 |
static double olda; /* remember previous setting here */ |
106 |
|
107 |
newa *= (newa > 0); |
108 |
if (fabs(newa - olda) >= .05*(newa + olda)) { |
109 |
ambacc = newa; |
110 |
if (ambacc > FTINY && nambvals > 0) |
111 |
sortambvals(); /* rebuild tree */ |
112 |
} |
113 |
} |
114 |
|
115 |
|
116 |
void |
117 |
setambient(void) /* initialize calculation */ |
118 |
{ |
119 |
int readonly = 0; |
120 |
long flen; |
121 |
AMBVAL amb; |
122 |
/* make sure we're fresh */ |
123 |
ambdone(); |
124 |
/* init ambient limits */ |
125 |
setambres(ambres); |
126 |
setambacc(ambacc); |
127 |
if (ambfile == NULL || !ambfile[0]) |
128 |
return; |
129 |
if (ambacc <= FTINY) { |
130 |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
131 |
ambfile); |
132 |
error(WARNING, errmsg); |
133 |
return; |
134 |
} |
135 |
/* open ambient file */ |
136 |
if ((ambfp = fopen(ambfile, "r+")) == NULL) |
137 |
readonly = (ambfp = fopen(ambfile, "r")) != NULL; |
138 |
if (ambfp != NULL) { |
139 |
initambfile(0); /* file exists */ |
140 |
lastpos = ftell(ambfp); |
141 |
while (readambval(&amb, ambfp)) |
142 |
avstore(&amb); |
143 |
nambshare = nambvals; /* share loaded values */ |
144 |
if (readonly) { |
145 |
sprintf(errmsg, |
146 |
"loaded %u values from read-only ambient file", |
147 |
nambvals); |
148 |
error(WARNING, errmsg); |
149 |
fclose(ambfp); /* close file so no writes */ |
150 |
ambfp = NULL; |
151 |
return; /* avoid ambsync() */ |
152 |
} |
153 |
/* align file pointer */ |
154 |
lastpos += (long)nambvals*AMBVALSIZ; |
155 |
flen = lseek(fileno(ambfp), (off_t)0, SEEK_END); |
156 |
if (flen != lastpos) { |
157 |
sprintf(errmsg, |
158 |
"ignoring last %ld values in ambient file (corrupted)", |
159 |
(flen - lastpos)/AMBVALSIZ); |
160 |
error(WARNING, errmsg); |
161 |
fseek(ambfp, lastpos, SEEK_SET); |
162 |
ftruncate(fileno(ambfp), (off_t)lastpos); |
163 |
} |
164 |
} else if ((ambfp = fopen(ambfile, "w+")) != NULL) { |
165 |
initambfile(1); /* else create new file */ |
166 |
fflush(ambfp); |
167 |
lastpos = ftell(ambfp); |
168 |
} else { |
169 |
sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile); |
170 |
error(SYSTEM, errmsg); |
171 |
} |
172 |
#ifdef F_SETLKW |
173 |
aflock(F_UNLCK); /* release file */ |
174 |
#endif |
175 |
} |
176 |
|
177 |
|
178 |
void |
179 |
ambdone(void) /* close ambient file and free memory */ |
180 |
{ |
181 |
if (ambfp != NULL) { /* close ambient file */ |
182 |
ambsync(); |
183 |
fclose(ambfp); |
184 |
ambfp = NULL; |
185 |
if (ambinp != NULL) { |
186 |
fclose(ambinp); |
187 |
ambinp = NULL; |
188 |
} |
189 |
lastpos = -1; |
190 |
} |
191 |
/* free ambient tree */ |
192 |
unloadatree(&atrunk, avfree); |
193 |
/* reset state variables */ |
194 |
avsum = 0.; |
195 |
navsum = 0; |
196 |
nambvals = 0; |
197 |
nambshare = 0; |
198 |
} |
199 |
|
200 |
|
201 |
void |
202 |
ambnotify( /* record new modifier */ |
203 |
OBJECT obj |
204 |
) |
205 |
{ |
206 |
static int hitlimit = 0; |
207 |
OBJREC *o; |
208 |
char **amblp; |
209 |
|
210 |
if (obj == OVOID) { /* starting over */ |
211 |
ambset[0] = 0; |
212 |
hitlimit = 0; |
213 |
return; |
214 |
} |
215 |
o = objptr(obj); |
216 |
if (hitlimit || !ismodifier(o->otype)) |
217 |
return; |
218 |
for (amblp = amblist; *amblp != NULL; amblp++) |
219 |
if (!strcmp(o->oname, *amblp)) { |
220 |
if (ambset[0] >= MAXASET) { |
221 |
error(WARNING, "too many modifiers in ambient list"); |
222 |
hitlimit++; |
223 |
return; /* should this be fatal? */ |
224 |
} |
225 |
insertelem(ambset, obj); |
226 |
return; |
227 |
} |
228 |
} |
229 |
|
230 |
|
231 |
void |
232 |
multambient( /* compute ambient component & multiply by coef. */ |
233 |
SCOLOR aval, |
234 |
RAY *r, |
235 |
FVECT nrm |
236 |
) |
237 |
{ |
238 |
static double logAvgAbsorp = 1; |
239 |
static int rdepth = 0; /* ambient recursion */ |
240 |
SCOLOR acol, caustic; |
241 |
int i, ok; |
242 |
double d, l; |
243 |
|
244 |
/* PMAP: Factor in ambient from photon map, if enabled and ray is |
245 |
* ambient. Return as all ambient components accounted for, else |
246 |
* continue. */ |
247 |
if (ambPmap(aval, r, rdepth)) |
248 |
return; |
249 |
|
250 |
if (logAvgAbsorp > 0) /* exclude in -aw to avoid growth */ |
251 |
logAvgAbsorp = log(1.-AVGREFL); |
252 |
|
253 |
/* PMAP: Factor in specular-diffuse ambient (caustics) from photon |
254 |
* map, if enabled and ray is primary, else caustic is zero. Continue |
255 |
* with RADIANCE ambient calculation */ |
256 |
{/* XXX TEMPORARY */ |
257 |
COLOR pmc; |
258 |
scolor_color(pmc, aval); |
259 |
ambPmapCaustic(pmc, r, rdepth); |
260 |
setscolor(caustic, colval(pmc,RED), colval(pmc,GRN), colval(pmc,BLU)); |
261 |
} |
262 |
if (ambdiv <= 0) /* no ambient calculation */ |
263 |
goto dumbamb; |
264 |
/* check number of bounces */ |
265 |
if (rdepth >= ambounce) |
266 |
goto dumbamb; |
267 |
/* check ambient list */ |
268 |
if (ambincl != -1 && r->ro != NULL && |
269 |
ambincl != inset(ambset, r->ro->omod)) |
270 |
goto dumbamb; |
271 |
|
272 |
if (ambacc <= FTINY) { /* no ambient storage? */ |
273 |
double rdot = DOT(nrm,r->ron); |
274 |
int sgn = 1 - 2*(rdot < 0); |
275 |
float dgrad[2], *dgp = NULL; |
276 |
FVECT uvd[2]; |
277 |
|
278 |
if (sgn*rdot < 0.9999) |
279 |
dgp = dgrad; /* compute rotational grad. */ |
280 |
copyscolor(acol, aval); |
281 |
rdepth++; |
282 |
ok = doambient(acol, r, r->rweight*sgn, |
283 |
uvd, NULL, NULL, dgp, NULL); |
284 |
rdepth--; |
285 |
if (!ok) |
286 |
goto dumbamb; |
287 |
if ((ok > 0) & (dgp != NULL)) { /* apply texture */ |
288 |
FVECT v1; |
289 |
VCROSS(v1, r->ron, nrm); |
290 |
d = 1.0; |
291 |
for (i = 3; i--; ) |
292 |
d += sgn*v1[i] * (dgp[0]*uvd[0][i] + dgp[1]*uvd[1][i]); |
293 |
if (d >= 0.05) |
294 |
scalescolor(acol, d); |
295 |
} |
296 |
copyscolor(aval, acol); |
297 |
|
298 |
/* PMAP: add in caustic */ |
299 |
saddscolor(aval, caustic); |
300 |
return; |
301 |
} |
302 |
/* interpolate ambient value */ |
303 |
scolorblack(acol); |
304 |
d = sumambient(acol, r, nrm, rdepth, |
305 |
&atrunk, thescene.cuorg, thescene.cusize); |
306 |
|
307 |
if (d > FTINY) { |
308 |
scalescolor(acol, 1.0/d); |
309 |
smultscolor(aval, acol); |
310 |
|
311 |
/* PMAP: add in caustic */ |
312 |
saddscolor(aval, caustic); |
313 |
return; |
314 |
} |
315 |
|
316 |
rdepth++; /* need to cache new value */ |
317 |
ok = makeambient(acol, r, nrm, rdepth-1); |
318 |
rdepth--; |
319 |
|
320 |
if (ok) { |
321 |
smultscolor(aval, acol); /* computed new value */ |
322 |
|
323 |
/* PMAP: add in caustic */ |
324 |
saddscolor(aval, caustic); |
325 |
return; |
326 |
} |
327 |
|
328 |
dumbamb: /* return global value */ |
329 |
if ((ambvwt <= 0) | (navsum == 0)) { |
330 |
smultcolor(aval, ambval); |
331 |
|
332 |
/* PMAP: add in caustic */ |
333 |
saddscolor(aval, caustic); |
334 |
return; |
335 |
} |
336 |
|
337 |
l = bright(ambval); /* average in computations */ |
338 |
if (l > FTINY) { |
339 |
d = (log(l)*(double)ambvwt + avsum + logAvgAbsorp*navsum) / |
340 |
(double)(ambvwt + navsum); |
341 |
d = exp(d) / l; |
342 |
scalescolor(aval, d); |
343 |
smultcolor(aval, ambval); /* apply color of ambval */ |
344 |
} else { |
345 |
d = exp( avsum/(double)navsum + logAvgAbsorp ); |
346 |
scalescolor(aval, d); /* neutral color */ |
347 |
} |
348 |
} |
349 |
|
350 |
|
351 |
/* Plug a potential leak where ambient cache value is occluded */ |
352 |
static int |
353 |
plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang) |
354 |
{ |
355 |
const double cost70sq = 0.1169778; /* cos(70deg)^2 */ |
356 |
RAY rtst; |
357 |
FVECT vdif; |
358 |
double normdot, ndotd, nadotd; |
359 |
double a, b, c, t[2]; |
360 |
|
361 |
ang += 2.*PI*(ang < 0); /* check direction flags */ |
362 |
if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) ) |
363 |
return(0); |
364 |
/* |
365 |
* Generate test ray, targeting 20 degrees above sample point plane |
366 |
* along surface normal from cache position. This should be high |
367 |
* enough to miss local geometry we don't really care about. |
368 |
*/ |
369 |
VSUB(vdif, ap->pos, r->rop); |
370 |
normdot = DOT(anorm, r->ron); |
371 |
ndotd = DOT(vdif, r->ron); |
372 |
nadotd = DOT(vdif, anorm); |
373 |
a = normdot*normdot - cost70sq; |
374 |
b = 2.0*(normdot*ndotd - nadotd*cost70sq); |
375 |
c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq; |
376 |
if (quadratic(t, a, b, c) != 2) |
377 |
return(1); /* should rarely happen */ |
378 |
if (t[1] <= FTINY) |
379 |
return(0); /* should fail behind test */ |
380 |
rayorigin(&rtst, SHADOW, r, NULL); |
381 |
VSUM(rtst.rdir, vdif, anorm, t[1]); /* further dist. > plane */ |
382 |
rtst.rmax = normalize(rtst.rdir); /* short ray test */ |
383 |
while (localhit(&rtst, &thescene)) { /* check for occluder */ |
384 |
OBJREC *m = findmaterial(rtst.ro); |
385 |
if (m != NULL && !istransp(m) && !isBSDFproxy(m) && |
386 |
(rtst.clipset == NULL || |
387 |
!inset(rtst.clipset, rtst.ro->omod))) |
388 |
return(1); /* plug light leak */ |
389 |
VCOPY(rtst.rorg, rtst.rop); /* skip invisible surface */ |
390 |
rtst.rmax -= rtst.rot; |
391 |
rayclear(&rtst); |
392 |
} |
393 |
return(0); /* seems we're OK */ |
394 |
} |
395 |
|
396 |
|
397 |
static double |
398 |
sumambient( /* get interpolated ambient value */ |
399 |
SCOLOR acol, |
400 |
RAY *r, |
401 |
FVECT rn, |
402 |
int al, |
403 |
AMBTREE *at, |
404 |
FVECT c0, |
405 |
double s |
406 |
) |
407 |
{ /* initial limit is 10 degrees plus ambacc radians */ |
408 |
const double minangle = 10.0 * PI/180.; |
409 |
const int sgn = 1 - 2*(DOT(r->ron,rn) < 0); |
410 |
double maxangle = minangle + ambacc; |
411 |
double wsum = 0.0; |
412 |
FVECT ck0; |
413 |
int i, j; |
414 |
AMBVAL *av; |
415 |
|
416 |
if (at->kid != NULL) { /* sum children first */ |
417 |
s *= 0.5; |
418 |
for (i = 0; i < 8; i++) { |
419 |
for (j = 0; j < 3; j++) { |
420 |
ck0[j] = c0[j]; |
421 |
if (1<<j & i) |
422 |
ck0[j] += s; |
423 |
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
424 |
break; |
425 |
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
426 |
break; |
427 |
} |
428 |
if (j == 3) |
429 |
wsum += sumambient(acol, r, rn, al, |
430 |
at->kid+i, ck0, s); |
431 |
} |
432 |
/* good enough? */ |
433 |
if ((wsum >= 0.05) & (s*ambacc > minarad)) |
434 |
return(wsum); |
435 |
} |
436 |
/* adjust maximum angle */ |
437 |
if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6)) |
438 |
maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.; |
439 |
/* sum this node */ |
440 |
for (av = at->alist; av != NULL; av = av->next) { |
441 |
double u, v, d, delta_r2, delta_t2; |
442 |
SCOLOR sct; |
443 |
FVECT uvw[3]; |
444 |
/* |
445 |
* Ambient level test |
446 |
*/ |
447 |
if (av->lvl > al || /* list sorted, so this works */ |
448 |
(av->lvl == al) & (av->weight < 0.9*r->rweight)) |
449 |
break; |
450 |
/* |
451 |
* Direction test using unperturbed normal |
452 |
*/ |
453 |
decodedir(uvw[2], av->ndir); |
454 |
d = sgn * DOT(uvw[2], r->ron); |
455 |
if (d <= 0.0) /* >= 90 degrees */ |
456 |
continue; |
457 |
delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */ |
458 |
if (delta_r2 >= maxangle*maxangle) |
459 |
continue; |
460 |
/* |
461 |
* Modified ray behind test |
462 |
*/ |
463 |
VSUB(ck0, r->rop, av->pos); |
464 |
d = DOT(ck0, uvw[2]); |
465 |
if (d < -minarad*ambacc) |
466 |
continue; |
467 |
d /= av->rad[0]; |
468 |
delta_t2 = d*d; |
469 |
if (delta_t2 >= ambacc*ambacc) |
470 |
continue; |
471 |
/* |
472 |
* Elliptical radii test based on Hessian |
473 |
*/ |
474 |
decodedir(uvw[0], av->udir); |
475 |
VCROSS(uvw[1], uvw[2], uvw[0]); |
476 |
d = (u = DOT(ck0, uvw[0])) / av->rad[0]; |
477 |
delta_t2 += d*d; |
478 |
d = (v = DOT(ck0, uvw[1])) / av->rad[1]; |
479 |
delta_t2 += d*d; |
480 |
if (delta_t2 >= ambacc*ambacc) |
481 |
continue; |
482 |
/* |
483 |
* Test for potential light leak |
484 |
*/ |
485 |
if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u))) |
486 |
continue; |
487 |
/* |
488 |
* Extrapolate value and compute final weight (hat function) |
489 |
*/ |
490 |
if (!extambient(sct, av, r->rop, rn, uvw)) |
491 |
continue; |
492 |
d = tfunc(maxangle, sqrt(delta_r2), 0.0) * |
493 |
tfunc(ambacc, sqrt(delta_t2), 0.0); |
494 |
scalescolor(sct, d); |
495 |
saddscolor(acol, sct); |
496 |
wsum += d; |
497 |
} |
498 |
return(wsum); |
499 |
} |
500 |
|
501 |
|
502 |
static int |
503 |
makeambient( /* make a new ambient value for storage */ |
504 |
SCOLOR acol, |
505 |
RAY *r, |
506 |
FVECT rn, |
507 |
int al |
508 |
) |
509 |
{ |
510 |
int sgn = 1 - 2*(DOT(r->ron,rn) < 0); |
511 |
AMBVAL amb; |
512 |
FVECT uvw[3]; |
513 |
int i; |
514 |
|
515 |
amb.weight = 1.0; /* compute weight */ |
516 |
for (i = al; i-- > 0; ) |
517 |
amb.weight *= AVGREFL; |
518 |
if (r->rweight < 0.1*amb.weight) /* heuristic override */ |
519 |
amb.weight = 1.25*r->rweight; |
520 |
setscolor(acol, AVGREFL, AVGREFL, AVGREFL); |
521 |
/* compute ambient */ |
522 |
i = doambient(acol, r, amb.weight*sgn, |
523 |
uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral); |
524 |
scalescolor(acol, 1./AVGREFL); /* undo assumed reflectance */ |
525 |
if (i <= 0 || amb.rad[0] <= FTINY) /* no Hessian or zero radius */ |
526 |
return(i); |
527 |
uvw[2][0] = sgn*r->ron[0]; /* orient unperturbed normal */ |
528 |
uvw[2][1] = sgn*r->ron[1]; |
529 |
uvw[2][2] = sgn*r->ron[2]; |
530 |
/* store value */ |
531 |
VCOPY(amb.pos, r->rop); |
532 |
amb.ndir = encodedir(uvw[2]); |
533 |
amb.udir = encodedir(uvw[0]); |
534 |
amb.lvl = al; |
535 |
copyscolor(amb.val, acol); |
536 |
avsave(&amb); /* insert and save to file */ |
537 |
if (DOT(uvw[2],rn) < 0.9999) /* texture? */ |
538 |
extambient(acol, &amb, r->rop, rn, uvw); |
539 |
return(1); |
540 |
} |
541 |
|
542 |
|
543 |
static int |
544 |
extambient( /* extrapolate value at pv, nv */ |
545 |
SCOLOR scr, |
546 |
AMBVAL *ap, |
547 |
FVECT pv, |
548 |
FVECT nv, |
549 |
FVECT uvw[3] |
550 |
) |
551 |
{ |
552 |
const double min_d = 0.05; |
553 |
const double max_d = 20.; |
554 |
static FVECT my_uvw[3]; |
555 |
FVECT v1; |
556 |
int i; |
557 |
double d = 1.0; /* zeroeth order */ |
558 |
|
559 |
if (uvw == NULL) { /* need local coordinates? */ |
560 |
decodedir(my_uvw[2], ap->ndir); |
561 |
decodedir(my_uvw[0], ap->udir); |
562 |
VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]); |
563 |
uvw = my_uvw; |
564 |
} |
565 |
for (i = 3; i--; ) /* gradient due to translation */ |
566 |
d += (pv[i] - ap->pos[i]) * |
567 |
(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]); |
568 |
|
569 |
VCROSS(v1, uvw[2], nv); /* gradient due to rotation */ |
570 |
for (i = 3; i--; ) |
571 |
d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]); |
572 |
|
573 |
if (d < min_d) /* clamp min/max scaling */ |
574 |
d = min_d; |
575 |
else if (d > max_d) |
576 |
d = max_d; |
577 |
copyscolor(scr, ap->val); |
578 |
scalescolor(scr, d); |
579 |
return(d > min_d); |
580 |
} |
581 |
|
582 |
|
583 |
static void |
584 |
avinsert( /* insert ambient value in our tree */ |
585 |
AMBVAL *av |
586 |
) |
587 |
{ |
588 |
AMBTREE *at; |
589 |
AMBVAL *ap; |
590 |
AMBVAL avh; |
591 |
FVECT ck0; |
592 |
double s; |
593 |
int branch; |
594 |
int i; |
595 |
|
596 |
if (av->rad[0] <= FTINY) |
597 |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
598 |
at = &atrunk; |
599 |
VCOPY(ck0, thescene.cuorg); |
600 |
s = thescene.cusize; |
601 |
while (s*(OCTSCALE/2) > av->rad[1]*ambacc) { |
602 |
if (at->kid == NULL) |
603 |
if ((at->kid = newambtree()) == NULL) |
604 |
error(SYSTEM, "out of memory in avinsert"); |
605 |
s *= 0.5; |
606 |
branch = 0; |
607 |
for (i = 0; i < 3; i++) |
608 |
if (av->pos[i] > ck0[i] + s) { |
609 |
ck0[i] += s; |
610 |
branch |= 1 << i; |
611 |
} |
612 |
at = at->kid + branch; |
613 |
} |
614 |
avh.next = at->alist; /* order by increasing level */ |
615 |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
616 |
if ( ap->next->lvl > av->lvl || |
617 |
(ap->next->lvl == av->lvl) & |
618 |
(ap->next->weight <= av->weight) ) |
619 |
break; |
620 |
av->next = ap->next; |
621 |
ap->next = (AMBVAL*)av; |
622 |
at->alist = avh.next; |
623 |
} |
624 |
|
625 |
|
626 |
static void |
627 |
initambfile( /* initialize ambient file */ |
628 |
int cre8 |
629 |
) |
630 |
{ |
631 |
extern char *progname, *octname; |
632 |
static char *mybuf = NULL; |
633 |
|
634 |
#ifdef F_SETLKW |
635 |
aflock(cre8 ? F_WRLCK : F_RDLCK); |
636 |
#endif |
637 |
SET_FILE_BINARY(ambfp); |
638 |
if (mybuf == NULL) |
639 |
mybuf = (char *)bmalloc(BUFSIZ+8); |
640 |
setbuf(ambfp, mybuf); |
641 |
retry: |
642 |
if (cre8) { /* new file */ |
643 |
newheader("RADIANCE", ambfp); |
644 |
fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ", |
645 |
progname, colval(ambval,RED), |
646 |
colval(ambval,GRN), colval(ambval,BLU), |
647 |
ambvwt, ambounce, ambacc); |
648 |
fprintf(ambfp, "-ad %d -as %d -ar %d ", |
649 |
ambdiv, ambssamp, ambres); |
650 |
fprintf(ambfp, "-dr %d -ds %g -dt %g -dc %g ", directrelay, |
651 |
srcsizerat, shadthresh, shadcert); |
652 |
fprintf(ambfp, "-ss %g -st %g -lr %d -lw %g ", specjitter, |
653 |
specthresh, maxdepth, minweight); |
654 |
fprintf(ambfp, "-cw %g %g -cs %d ", WLPART[3], WLPART[0], NCSAMP); |
655 |
if (octname != NULL) |
656 |
fputs(octname, ambfp); |
657 |
fputc('\n', ambfp); /* end of command line, not header! */ |
658 |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
659 |
fputnow(ambfp); |
660 |
AMB_CNDX = CNDX; /* use current spectral sampling */ |
661 |
AMB_WLPART = WLPART; |
662 |
fputwlsplit(WLPART, ambfp); |
663 |
fputncomp(NCSAMP, ambfp); |
664 |
fputformat(AMBFMT, ambfp); |
665 |
fputc('\n', ambfp); |
666 |
putambmagic(ambfp); |
667 |
} else if (getheader(ambfp, amb_headline, NULL) < 0 || !hasambmagic(ambfp)) { |
668 |
#ifndef F_SETLKW |
669 |
static int ntries = 3; |
670 |
if (--ntries > 0 && ftell(ambfp) == 0) { |
671 |
clearerr(ambfp); |
672 |
sleep(2); |
673 |
goto retry; |
674 |
} |
675 |
#endif |
676 |
error(USER, "bad/incompatible ambient file"); |
677 |
} |
678 |
if ((AMB_CNDX != CNDX) | (AMB_WLPART != WLPART)) { |
679 |
if (setspectrsamp(AMB_CNDX, AMB_WLPART) < 0) |
680 |
error(USER, "bad wavelength sampling in ambient file"); |
681 |
if (AMB_CNDX[3] == CNDX[3] && FABSEQ(AMB_WLPART[0],WLPART[0]) && |
682 |
FABSEQ(AMB_WLPART[3],WLPART[3])) { |
683 |
AMB_CNDX = CNDX; |
684 |
AMB_WLPART = WLPART; /* just the same */ |
685 |
} else |
686 |
error(WARNING, "different ambient file wavelength sampling"); |
687 |
} |
688 |
} |
689 |
|
690 |
|
691 |
static void |
692 |
avsave( /* insert and save an ambient value */ |
693 |
AMBVAL *av |
694 |
) |
695 |
{ |
696 |
avstore(av); |
697 |
if (ambfp == NULL) |
698 |
return; |
699 |
if (writambval(av, ambfp) < 0) |
700 |
goto writerr; |
701 |
if (++nunflshed >= AMBFLUSH) |
702 |
if (ambsync() == EOF) |
703 |
goto writerr; |
704 |
return; |
705 |
writerr: |
706 |
error(SYSTEM, "error writing to ambient file"); |
707 |
} |
708 |
|
709 |
|
710 |
static AMBVAL * |
711 |
avstore( /* allocate memory and save aval */ |
712 |
AMBVAL *aval |
713 |
) |
714 |
{ |
715 |
AMBVAL *av; |
716 |
double d; |
717 |
|
718 |
if ((av = newambval()) == NULL) |
719 |
error(SYSTEM, "out of memory in avstore"); |
720 |
memcpy(av, aval, AVSIZE); /* AVSIZE <= sizeof(AMBVAL) */ |
721 |
av->next = NULL; |
722 |
nambvals++; |
723 |
d = pbright(av->val); |
724 |
if (d > FTINY) { /* add to log sum for averaging */ |
725 |
avsum += log(d); |
726 |
navsum++; |
727 |
} |
728 |
avinsert(av); /* insert in our cache tree */ |
729 |
return(av); |
730 |
} |
731 |
|
732 |
|
733 |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
734 |
|
735 |
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
736 |
|
737 |
|
738 |
static AMBTREE * |
739 |
newambtree(void) /* allocate 8 ambient tree structs */ |
740 |
{ |
741 |
AMBTREE *atp, *upperlim; |
742 |
|
743 |
if (atfreelist == NULL) { /* get more nodes */ |
744 |
atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
745 |
if (atfreelist == NULL) |
746 |
return(NULL); |
747 |
/* link new free list */ |
748 |
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
749 |
for (atp = atfreelist; atp < upperlim; atp += 8) |
750 |
atp->kid = atp + 8; |
751 |
atp->kid = NULL; |
752 |
} |
753 |
atp = atfreelist; |
754 |
atfreelist = atp->kid; |
755 |
memset(atp, 0, 8*sizeof(AMBTREE)); |
756 |
return(atp); |
757 |
} |
758 |
|
759 |
|
760 |
static void |
761 |
freeambtree( /* free 8 ambient tree structs */ |
762 |
AMBTREE *atp |
763 |
) |
764 |
{ |
765 |
atp->kid = atfreelist; |
766 |
atfreelist = atp; |
767 |
} |
768 |
|
769 |
|
770 |
static void |
771 |
unloadatree( /* unload an ambient value tree */ |
772 |
AMBTREE *at, |
773 |
unloadtf_t *f |
774 |
) |
775 |
{ |
776 |
AMBVAL *av; |
777 |
int i; |
778 |
/* transfer values at this node */ |
779 |
for (av = at->alist; av != NULL; av = at->alist) { |
780 |
at->alist = av->next; |
781 |
av->next = NULL; |
782 |
(*f)(av); |
783 |
} |
784 |
if (at->kid == NULL) |
785 |
return; |
786 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
787 |
unloadatree(at->kid+i, f); |
788 |
freeambtree(at->kid); |
789 |
at->kid = NULL; |
790 |
} |
791 |
|
792 |
|
793 |
static void |
794 |
avfree(AMBVAL *av) |
795 |
{ |
796 |
free(av); |
797 |
} |
798 |
|
799 |
|
800 |
static void |
801 |
sortambvals(void) /* resort ambient values */ |
802 |
{ |
803 |
AMBTREE oldatrunk = atrunk; |
804 |
|
805 |
atrunk.alist = NULL; |
806 |
atrunk.kid = NULL; |
807 |
unloadatree(&oldatrunk, avinsert); |
808 |
} |
809 |
|
810 |
|
811 |
#ifdef F_SETLKW |
812 |
|
813 |
static void |
814 |
aflock( /* lock/unlock ambient file */ |
815 |
int typ |
816 |
) |
817 |
{ |
818 |
static struct flock fls; /* static so initialized to zeroes */ |
819 |
|
820 |
if (typ == fls.l_type) /* already called? */ |
821 |
return; |
822 |
|
823 |
fls.l_type = typ; |
824 |
do |
825 |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) != -1) |
826 |
return; |
827 |
while (errno == EINTR); |
828 |
|
829 |
error(SYSTEM, "cannot (un)lock ambient file"); |
830 |
} |
831 |
|
832 |
|
833 |
int |
834 |
ambsync(void) /* synchronize ambient file */ |
835 |
{ |
836 |
long flen; |
837 |
AMBVAL avs; |
838 |
int n; |
839 |
|
840 |
if (ambfp == NULL) /* no ambient file? */ |
841 |
return(0); |
842 |
/* gain appropriate access */ |
843 |
aflock(nunflshed ? F_WRLCK : F_RDLCK); |
844 |
/* see if file has grown */ |
845 |
if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0) |
846 |
goto seekerr; |
847 |
if ((n = flen - lastpos) > 0) { /* file has grown */ |
848 |
if (ambinp == NULL) { /* get new file pointer */ |
849 |
ambinp = fopen(ambfile, "rb"); |
850 |
if (ambinp == NULL) |
851 |
error(SYSTEM, "fopen failed in ambsync"); |
852 |
} |
853 |
if (fseek(ambinp, lastpos, SEEK_SET) < 0) |
854 |
goto seekerr; |
855 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
856 |
if (!readambval(&avs, ambinp)) { |
857 |
sprintf(errmsg, |
858 |
"ambient file \"%s\" corrupted near character %ld", |
859 |
ambfile, flen - n); |
860 |
error(WARNING, errmsg); |
861 |
break; |
862 |
} |
863 |
avstore(&avs); |
864 |
n -= AMBVALSIZ; |
865 |
} |
866 |
lastpos = flen - n; /* check alignment */ |
867 |
if (n && lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0) |
868 |
goto seekerr; |
869 |
} |
870 |
n = fflush(ambfp); /* calls write() at last */ |
871 |
lastpos += (long)nunflshed*AMBVALSIZ; |
872 |
aflock(F_UNLCK); /* release file */ |
873 |
nunflshed = 0; |
874 |
return(n); |
875 |
seekerr: |
876 |
error(SYSTEM, "seek failed in ambsync"); |
877 |
return(EOF); /* pro forma return */ |
878 |
} |
879 |
|
880 |
#else /* ! F_SETLKW */ |
881 |
|
882 |
int |
883 |
ambsync(void) /* flush ambient file */ |
884 |
{ |
885 |
if (ambfp == NULL) |
886 |
return(0); |
887 |
nunflshed = 0; |
888 |
return(fflush(ambfp)); |
889 |
} |
890 |
|
891 |
#endif /* ! F_SETLKW */ |