| 1 |
static const char RCSid[] = "$Id: ambient.c,v 2.128 2024/12/19 19:34:31 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; /* 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 FILE *ambinp = NULL; /* auxiliary file for input */ |
| 42 |
static off_t lastpos = -1; /* last flush position */ |
| 43 |
|
| 44 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
| 45 |
|
| 46 |
#define AVSIZE (sizeof(AMBVAL)-sizeof(SCOLOR)+sizeof(COLORV)*NCSAMP) |
| 47 |
#define newambval() (AMBVAL *)malloc(AVSIZE) |
| 48 |
|
| 49 |
#define tfunc(x0, x, x1) (((x)-(x0))/((x1)-(x0))) |
| 50 |
|
| 51 |
static void initambfile(int cre8); |
| 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(SCOLOR acol, RAY *r, FVECT rn, int al, |
| 66 |
AMBTREE *at, FVECT c0, double s); |
| 67 |
static int makeambient(SCOLOR acol, RAY *r, FVECT rn, int al); |
| 68 |
static int extambient(SCOLOR 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 */ |
| 82 |
/* 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 |
off_t flen; |
| 120 |
AMBVAL amb; |
| 121 |
/* make sure we're fresh */ |
| 122 |
ambdone(); |
| 123 |
/* 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; |
| 133 |
} |
| 134 |
/* 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 = ftello(ambfp); |
| 140 |
while (readambval(&amb, ambfp)) |
| 141 |
avstore(&amb); |
| 142 |
if (readonly) { |
| 143 |
sprintf(errmsg, |
| 144 |
"loaded %u values from read-only ambient file", |
| 145 |
nambvals); |
| 146 |
error(WARNING, errmsg); |
| 147 |
fclose(ambfp); /* close file so no writes */ |
| 148 |
ambfp = NULL; |
| 149 |
return; /* avoid ambsync() */ |
| 150 |
} |
| 151 |
/* align file pointer */ |
| 152 |
lastpos += (off_t)nambvals*AMBVALSIZ; |
| 153 |
flen = lseek(fileno(ambfp), 0, SEEK_END); |
| 154 |
if (flen != lastpos) { |
| 155 |
sprintf(errmsg, |
| 156 |
"ignoring last %ld values in ambient file (corrupted)", |
| 157 |
(flen - lastpos)/AMBVALSIZ); |
| 158 |
error(WARNING, errmsg); |
| 159 |
fseeko(ambfp, lastpos, SEEK_SET); |
| 160 |
ftruncate(fileno(ambfp), lastpos); |
| 161 |
} |
| 162 |
} else if ((ambfp = fopen(ambfile, "w+")) != NULL) { |
| 163 |
initambfile(1); /* else create new file */ |
| 164 |
fflush(ambfp); |
| 165 |
lastpos = ftello(ambfp); |
| 166 |
} else { |
| 167 |
sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile); |
| 168 |
error(SYSTEM, errmsg); |
| 169 |
} |
| 170 |
#ifdef F_SETLKW |
| 171 |
aflock(F_UNLCK); /* release file */ |
| 172 |
#endif |
| 173 |
} |
| 174 |
|
| 175 |
|
| 176 |
void |
| 177 |
ambdone(void) /* close ambient file and free memory */ |
| 178 |
{ |
| 179 |
if (ambfp != NULL) { /* close ambient file */ |
| 180 |
ambsync(); |
| 181 |
fclose(ambfp); |
| 182 |
ambfp = NULL; |
| 183 |
if (ambinp != NULL) { |
| 184 |
fclose(ambinp); |
| 185 |
ambinp = NULL; |
| 186 |
} |
| 187 |
lastpos = -1; |
| 188 |
} |
| 189 |
/* free ambient tree */ |
| 190 |
unloadatree(&atrunk, avfree); |
| 191 |
/* reset state variables */ |
| 192 |
avsum = 0.; |
| 193 |
navsum = 0; |
| 194 |
nambvals = 0; |
| 195 |
} |
| 196 |
|
| 197 |
|
| 198 |
void |
| 199 |
ambnotify( /* record new modifier */ |
| 200 |
OBJECT obj |
| 201 |
) |
| 202 |
{ |
| 203 |
static int hitlimit = 0; |
| 204 |
OBJREC *o; |
| 205 |
char **amblp; |
| 206 |
|
| 207 |
if (obj == OVOID) { /* starting over */ |
| 208 |
ambset[0] = 0; |
| 209 |
hitlimit = 0; |
| 210 |
return; |
| 211 |
} |
| 212 |
o = objptr(obj); |
| 213 |
if (hitlimit || !ismodifier(o->otype)) |
| 214 |
return; |
| 215 |
for (amblp = amblist; *amblp != NULL; amblp++) |
| 216 |
if (!strcmp(o->oname, *amblp)) { |
| 217 |
if (ambset[0] >= MAXASET) { |
| 218 |
error(WARNING, "too many modifiers in ambient list"); |
| 219 |
hitlimit++; |
| 220 |
return; /* should this be fatal? */ |
| 221 |
} |
| 222 |
insertelem(ambset, obj); |
| 223 |
return; |
| 224 |
} |
| 225 |
} |
| 226 |
|
| 227 |
|
| 228 |
void |
| 229 |
multambient( /* compute ambient component & multiply by coef. */ |
| 230 |
SCOLOR aval, |
| 231 |
RAY *r, |
| 232 |
FVECT nrm |
| 233 |
) |
| 234 |
{ |
| 235 |
static double logAvgAbsorp = 1; |
| 236 |
static int rdepth = 0; /* ambient recursion */ |
| 237 |
SCOLOR acol, caustic; |
| 238 |
int i, ok; |
| 239 |
double d, l; |
| 240 |
|
| 241 |
/* PMAP: Factor in ambient from photon map, if enabled and ray is |
| 242 |
* ambient. Return as all ambient components accounted for, else |
| 243 |
* continue. */ |
| 244 |
if (ambPmap(aval, r, rdepth)) |
| 245 |
return; |
| 246 |
|
| 247 |
if (logAvgAbsorp > 0) /* exclude in -aw to avoid growth */ |
| 248 |
logAvgAbsorp = log(1.-AVGREFL); |
| 249 |
|
| 250 |
/* PMAP: Factor in specular-diffuse ambient (caustics) from photon |
| 251 |
* map, if enabled and ray is primary, else caustic is zero. Continue |
| 252 |
* with RADIANCE ambient calculation */ |
| 253 |
{/* XXX TEMPORARY */ |
| 254 |
COLOR pmc; |
| 255 |
scolor_color(pmc, aval); |
| 256 |
ambPmapCaustic(pmc, r, rdepth); |
| 257 |
setscolor(caustic, colval(pmc,RED), colval(pmc,GRN), colval(pmc,BLU)); |
| 258 |
} |
| 259 |
if (ambdiv <= 0) /* no ambient calculation */ |
| 260 |
goto dumbamb; |
| 261 |
/* check number of bounces */ |
| 262 |
if (rdepth >= ambounce) |
| 263 |
goto dumbamb; |
| 264 |
/* check ambient list */ |
| 265 |
if (ambincl != -1 && r->ro != NULL && |
| 266 |
ambincl != inset(ambset, r->ro->omod)) |
| 267 |
goto dumbamb; |
| 268 |
|
| 269 |
if (ambacc <= FTINY) { /* no ambient storage? */ |
| 270 |
double rdot = DOT(nrm,r->ron); |
| 271 |
int sgn = 1 - 2*(rdot < 0); |
| 272 |
float dgrad[2], *dgp = NULL; |
| 273 |
FVECT uvd[2]; |
| 274 |
|
| 275 |
if (sgn*rdot < 0.9999) |
| 276 |
dgp = dgrad; /* compute rotational grad. */ |
| 277 |
copyscolor(acol, aval); |
| 278 |
rdepth++; |
| 279 |
ok = doambient(acol, r, r->rweight*sgn, |
| 280 |
uvd, NULL, NULL, dgp, NULL); |
| 281 |
rdepth--; |
| 282 |
if (!ok) |
| 283 |
goto dumbamb; |
| 284 |
if ((ok > 0) & (dgp != NULL)) { /* apply texture */ |
| 285 |
FVECT v1; |
| 286 |
VCROSS(v1, r->ron, nrm); |
| 287 |
d = 1.0; |
| 288 |
for (i = 3; i--; ) |
| 289 |
d += sgn*v1[i] * (dgp[0]*uvd[0][i] + dgp[1]*uvd[1][i]); |
| 290 |
if (d >= 0.05) |
| 291 |
scalescolor(acol, d); |
| 292 |
} |
| 293 |
copyscolor(aval, acol); |
| 294 |
|
| 295 |
/* PMAP: add in caustic */ |
| 296 |
saddscolor(aval, caustic); |
| 297 |
return; |
| 298 |
} |
| 299 |
/* interpolate ambient value */ |
| 300 |
scolorblack(acol); |
| 301 |
d = sumambient(acol, r, nrm, rdepth, |
| 302 |
&atrunk, thescene.cuorg, thescene.cusize); |
| 303 |
|
| 304 |
if (d > FTINY) { |
| 305 |
scalescolor(acol, 1.0/d); |
| 306 |
smultscolor(aval, acol); |
| 307 |
|
| 308 |
/* PMAP: add in caustic */ |
| 309 |
saddscolor(aval, caustic); |
| 310 |
return; |
| 311 |
} |
| 312 |
|
| 313 |
rdepth++; /* need to cache new value */ |
| 314 |
ok = makeambient(acol, r, nrm, rdepth-1); |
| 315 |
rdepth--; |
| 316 |
|
| 317 |
if (ok) { |
| 318 |
smultscolor(aval, acol); /* computed new value */ |
| 319 |
|
| 320 |
/* PMAP: add in caustic */ |
| 321 |
saddscolor(aval, caustic); |
| 322 |
return; |
| 323 |
} |
| 324 |
|
| 325 |
dumbamb: /* return global value */ |
| 326 |
if ((ambvwt <= 0) | (navsum == 0)) { |
| 327 |
smultcolor(aval, ambval); |
| 328 |
|
| 329 |
/* PMAP: add in caustic */ |
| 330 |
saddscolor(aval, caustic); |
| 331 |
return; |
| 332 |
} |
| 333 |
|
| 334 |
l = bright(ambval); /* average in computations */ |
| 335 |
if (l > FTINY) { |
| 336 |
d = (log(l)*(double)ambvwt + avsum + logAvgAbsorp*navsum) / |
| 337 |
(double)(ambvwt + navsum); |
| 338 |
d = exp(d) / l; |
| 339 |
scalescolor(aval, d); |
| 340 |
smultcolor(aval, ambval); /* apply color of ambval */ |
| 341 |
} else { |
| 342 |
d = exp( avsum/(double)navsum + logAvgAbsorp ); |
| 343 |
scalescolor(aval, d); /* neutral color */ |
| 344 |
} |
| 345 |
} |
| 346 |
|
| 347 |
|
| 348 |
/* Plug a potential leak where ambient cache value is occluded */ |
| 349 |
static int |
| 350 |
plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang) |
| 351 |
{ |
| 352 |
const double cost70sq = 0.1169778; /* cos(70deg)^2 */ |
| 353 |
RAY rtst; |
| 354 |
FVECT vdif; |
| 355 |
double normdot, ndotd, nadotd; |
| 356 |
double a, b, c, t[2]; |
| 357 |
|
| 358 |
ang += 2.*PI*(ang < 0); /* check direction flags */ |
| 359 |
if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) ) |
| 360 |
return(0); |
| 361 |
/* |
| 362 |
* Generate test ray, targeting 20 degrees above sample point plane |
| 363 |
* along surface normal from cache position. This should be high |
| 364 |
* enough to miss local geometry we don't really care about. |
| 365 |
*/ |
| 366 |
VSUB(vdif, ap->pos, r->rop); |
| 367 |
normdot = DOT(anorm, r->ron); |
| 368 |
ndotd = DOT(vdif, r->ron); |
| 369 |
nadotd = DOT(vdif, anorm); |
| 370 |
a = normdot*normdot - cost70sq; |
| 371 |
b = 2.0*(normdot*ndotd - nadotd*cost70sq); |
| 372 |
c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq; |
| 373 |
if (quadratic(t, a, b, c) != 2) |
| 374 |
return(1); /* should rarely happen */ |
| 375 |
if (t[1] <= FTINY) |
| 376 |
return(0); /* should fail behind test */ |
| 377 |
rayorigin(&rtst, SHADOW, r, NULL); |
| 378 |
VSUM(rtst.rdir, vdif, anorm, t[1]); /* further dist. > plane */ |
| 379 |
rtst.rmax = normalize(rtst.rdir); /* short ray test */ |
| 380 |
while (localhit(&rtst, &thescene)) { /* check for occluder */ |
| 381 |
OBJREC *m = findmaterial(rtst.ro); |
| 382 |
if (m != NULL && !istransp(m) && !isBSDFproxy(m) && |
| 383 |
(rtst.clipset == NULL || |
| 384 |
!inset(rtst.clipset, rtst.ro->omod))) |
| 385 |
return(1); /* plug light leak */ |
| 386 |
VCOPY(rtst.rorg, rtst.rop); /* skip invisible surface */ |
| 387 |
rtst.rmax -= rtst.rot; |
| 388 |
rayclear(&rtst); |
| 389 |
} |
| 390 |
return(0); /* seems we're OK */ |
| 391 |
} |
| 392 |
|
| 393 |
|
| 394 |
static double |
| 395 |
sumambient( /* get interpolated ambient value */ |
| 396 |
SCOLOR acol, |
| 397 |
RAY *r, |
| 398 |
FVECT rn, |
| 399 |
int al, |
| 400 |
AMBTREE *at, |
| 401 |
FVECT c0, |
| 402 |
double s |
| 403 |
) |
| 404 |
{ /* initial limit is 10 degrees plus ambacc radians */ |
| 405 |
const double minangle = 10.0 * PI/180.; |
| 406 |
const int sgn = 1 - 2*(DOT(r->ron,rn) < 0); |
| 407 |
double maxangle = minangle + ambacc; |
| 408 |
double wsum = 0.0; |
| 409 |
FVECT ck0; |
| 410 |
int i, j; |
| 411 |
AMBVAL *av; |
| 412 |
|
| 413 |
if (at->kid != NULL) { /* sum children first */ |
| 414 |
s *= 0.5; |
| 415 |
for (i = 0; i < 8; i++) { |
| 416 |
for (j = 0; j < 3; j++) { |
| 417 |
ck0[j] = c0[j]; |
| 418 |
if (1<<j & i) |
| 419 |
ck0[j] += s; |
| 420 |
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
| 421 |
break; |
| 422 |
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
| 423 |
break; |
| 424 |
} |
| 425 |
if (j == 3) |
| 426 |
wsum += sumambient(acol, r, rn, al, |
| 427 |
at->kid+i, ck0, s); |
| 428 |
} |
| 429 |
/* good enough? */ |
| 430 |
if ((wsum >= 0.05) & (s*ambacc > minarad)) |
| 431 |
return(wsum); |
| 432 |
} |
| 433 |
/* adjust maximum angle */ |
| 434 |
if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6)) |
| 435 |
maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.; |
| 436 |
/* sum this node */ |
| 437 |
for (av = at->alist; av != NULL; av = av->next) { |
| 438 |
double u, v, d, delta_r2, delta_t2; |
| 439 |
SCOLOR sct; |
| 440 |
FVECT uvw[3]; |
| 441 |
/* |
| 442 |
* Ambient level test |
| 443 |
*/ |
| 444 |
if (av->lvl > al || /* list sorted, so this works */ |
| 445 |
(av->lvl == al) & (av->weight < 0.9*r->rweight)) |
| 446 |
break; |
| 447 |
/* |
| 448 |
* Direction test using unperturbed normal |
| 449 |
*/ |
| 450 |
decodedir(uvw[2], av->ndir); |
| 451 |
d = sgn * DOT(uvw[2], r->ron); |
| 452 |
if (d <= 0.0) /* >= 90 degrees */ |
| 453 |
continue; |
| 454 |
delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */ |
| 455 |
if (delta_r2 >= maxangle*maxangle) |
| 456 |
continue; |
| 457 |
/* |
| 458 |
* Modified ray behind test |
| 459 |
*/ |
| 460 |
VSUB(ck0, r->rop, av->pos); |
| 461 |
d = DOT(ck0, uvw[2]); |
| 462 |
if (d < -minarad*ambacc) |
| 463 |
continue; |
| 464 |
d /= av->rad[0]; |
| 465 |
delta_t2 = d*d; |
| 466 |
if (delta_t2 >= ambacc*ambacc) |
| 467 |
continue; |
| 468 |
/* |
| 469 |
* Elliptical radii test based on Hessian |
| 470 |
*/ |
| 471 |
decodedir(uvw[0], av->udir); |
| 472 |
VCROSS(uvw[1], uvw[2], uvw[0]); |
| 473 |
d = (u = DOT(ck0, uvw[0])) / av->rad[0]; |
| 474 |
delta_t2 += d*d; |
| 475 |
d = (v = DOT(ck0, uvw[1])) / av->rad[1]; |
| 476 |
delta_t2 += d*d; |
| 477 |
if (delta_t2 >= ambacc*ambacc) |
| 478 |
continue; |
| 479 |
/* |
| 480 |
* Test for potential light leak |
| 481 |
*/ |
| 482 |
if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u))) |
| 483 |
continue; |
| 484 |
/* |
| 485 |
* Extrapolate value and compute final weight (hat function) |
| 486 |
*/ |
| 487 |
if (!extambient(sct, av, r->rop, rn, uvw)) |
| 488 |
continue; |
| 489 |
d = tfunc(maxangle, sqrt(delta_r2), 0.0) * |
| 490 |
tfunc(ambacc, sqrt(delta_t2), 0.0); |
| 491 |
scalescolor(sct, d); |
| 492 |
saddscolor(acol, sct); |
| 493 |
wsum += d; |
| 494 |
} |
| 495 |
return(wsum); |
| 496 |
} |
| 497 |
|
| 498 |
|
| 499 |
static int |
| 500 |
makeambient( /* make a new ambient value for storage */ |
| 501 |
SCOLOR acol, |
| 502 |
RAY *r, |
| 503 |
FVECT rn, |
| 504 |
int al |
| 505 |
) |
| 506 |
{ |
| 507 |
int sgn = 1 - 2*(DOT(r->ron,rn) < 0); |
| 508 |
AMBVAL amb; |
| 509 |
FVECT uvw[3]; |
| 510 |
int i; |
| 511 |
|
| 512 |
amb.weight = 1.0; /* compute weight */ |
| 513 |
for (i = al; i-- > 0; ) |
| 514 |
amb.weight *= AVGREFL; |
| 515 |
if (r->rweight < 0.1*amb.weight) /* heuristic override */ |
| 516 |
amb.weight = 1.25*r->rweight; |
| 517 |
setscolor(acol, AVGREFL, AVGREFL, AVGREFL); |
| 518 |
/* compute ambient */ |
| 519 |
i = doambient(acol, r, amb.weight*sgn, |
| 520 |
uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral); |
| 521 |
scalescolor(acol, 1./AVGREFL); /* undo assumed reflectance */ |
| 522 |
if (i <= 0 || amb.rad[0] <= FTINY) /* no Hessian or zero radius */ |
| 523 |
return(i); |
| 524 |
uvw[2][0] = sgn*r->ron[0]; /* orient unperturbed normal */ |
| 525 |
uvw[2][1] = sgn*r->ron[1]; |
| 526 |
uvw[2][2] = sgn*r->ron[2]; |
| 527 |
/* store value */ |
| 528 |
VCOPY(amb.pos, r->rop); |
| 529 |
amb.ndir = encodedir(uvw[2]); |
| 530 |
amb.udir = encodedir(uvw[0]); |
| 531 |
amb.lvl = al; |
| 532 |
copyscolor(amb.val, acol); |
| 533 |
avsave(&amb); /* insert and save to file */ |
| 534 |
if (DOT(uvw[2],rn) < 0.9999) /* texture? */ |
| 535 |
extambient(acol, &amb, r->rop, rn, uvw); |
| 536 |
return(1); |
| 537 |
} |
| 538 |
|
| 539 |
|
| 540 |
static int |
| 541 |
extambient( /* extrapolate value at pv, nv */ |
| 542 |
SCOLOR scr, |
| 543 |
AMBVAL *ap, |
| 544 |
FVECT pv, |
| 545 |
FVECT nv, |
| 546 |
FVECT uvw[3] |
| 547 |
) |
| 548 |
{ |
| 549 |
const double min_d = 0.05; |
| 550 |
const double max_d = 20.; |
| 551 |
static FVECT my_uvw[3]; |
| 552 |
FVECT v1; |
| 553 |
int i; |
| 554 |
double d = 1.0; /* zeroeth order */ |
| 555 |
|
| 556 |
if (uvw == NULL) { /* need local coordinates? */ |
| 557 |
decodedir(my_uvw[2], ap->ndir); |
| 558 |
decodedir(my_uvw[0], ap->udir); |
| 559 |
VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]); |
| 560 |
uvw = my_uvw; |
| 561 |
} |
| 562 |
for (i = 3; i--; ) /* gradient due to translation */ |
| 563 |
d += (pv[i] - ap->pos[i]) * |
| 564 |
(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]); |
| 565 |
|
| 566 |
VCROSS(v1, uvw[2], nv); /* gradient due to rotation */ |
| 567 |
for (i = 3; i--; ) |
| 568 |
d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]); |
| 569 |
|
| 570 |
if (d < min_d) /* clamp min/max scaling */ |
| 571 |
d = min_d; |
| 572 |
else if (d > max_d) |
| 573 |
d = max_d; |
| 574 |
copyscolor(scr, ap->val); |
| 575 |
scalescolor(scr, d); |
| 576 |
return(d > min_d); |
| 577 |
} |
| 578 |
|
| 579 |
|
| 580 |
static void |
| 581 |
avinsert( /* insert ambient value in our tree */ |
| 582 |
AMBVAL *av |
| 583 |
) |
| 584 |
{ |
| 585 |
AMBTREE *at; |
| 586 |
AMBVAL *ap; |
| 587 |
AMBVAL avh; |
| 588 |
FVECT ck0; |
| 589 |
double s; |
| 590 |
int branch; |
| 591 |
int i; |
| 592 |
|
| 593 |
if (av->rad[0] <= FTINY) |
| 594 |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
| 595 |
at = &atrunk; |
| 596 |
VCOPY(ck0, thescene.cuorg); |
| 597 |
s = thescene.cusize; |
| 598 |
while (s*(OCTSCALE/2) > av->rad[1]*ambacc) { |
| 599 |
if (at->kid == NULL) |
| 600 |
if ((at->kid = newambtree()) == NULL) |
| 601 |
error(SYSTEM, "out of memory in avinsert"); |
| 602 |
s *= 0.5; |
| 603 |
branch = 0; |
| 604 |
for (i = 0; i < 3; i++) |
| 605 |
if (av->pos[i] > ck0[i] + s) { |
| 606 |
ck0[i] += s; |
| 607 |
branch |= 1 << i; |
| 608 |
} |
| 609 |
at = at->kid + branch; |
| 610 |
} |
| 611 |
avh.next = at->alist; /* order by increasing level */ |
| 612 |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
| 613 |
if ( ap->next->lvl > av->lvl || |
| 614 |
(ap->next->lvl == av->lvl) & |
| 615 |
(ap->next->weight <= av->weight) ) |
| 616 |
break; |
| 617 |
av->next = ap->next; |
| 618 |
ap->next = (AMBVAL*)av; |
| 619 |
at->alist = avh.next; |
| 620 |
} |
| 621 |
|
| 622 |
|
| 623 |
static void |
| 624 |
initambfile( /* initialize ambient file */ |
| 625 |
int cre8 |
| 626 |
) |
| 627 |
{ |
| 628 |
extern char *progname, *octname; |
| 629 |
static char *mybuf = NULL; |
| 630 |
int ntries = 3; |
| 631 |
|
| 632 |
if (!AMBFLUSH) |
| 633 |
error(INTERNAL, "BUFSIZ too small in initambfile"); |
| 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 |
nunflshed = 0; |
| 642 |
retry: |
| 643 |
if (cre8) { /* new file */ |
| 644 |
newheader("RADIANCE", ambfp); |
| 645 |
fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ", |
| 646 |
progname, colval(ambval,RED), |
| 647 |
colval(ambval,GRN), colval(ambval,BLU), |
| 648 |
ambvwt, ambounce, ambacc); |
| 649 |
fprintf(ambfp, "-ad %d -as %d -ar %d ", |
| 650 |
ambdiv, ambssamp, ambres); |
| 651 |
fprintf(ambfp, "-dr %d -ds %g -dt %g -dc %g ", directrelay, |
| 652 |
srcsizerat, shadthresh, shadcert); |
| 653 |
fprintf(ambfp, "-ss %g -st %g -lr %d -lw %g ", specjitter, |
| 654 |
specthresh, maxdepth, minweight); |
| 655 |
fprintf(ambfp, "-cw %g %g -cs %d ", WLPART[3], WLPART[0], NCSAMP); |
| 656 |
if (octname != NULL) |
| 657 |
fputs(octname, ambfp); |
| 658 |
fputc('\n', ambfp); /* end of command line, not header! */ |
| 659 |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
| 660 |
fputnow(ambfp); |
| 661 |
AMB_CNDX = CNDX; /* use current spectral sampling */ |
| 662 |
AMB_WLPART = WLPART; |
| 663 |
fputwlsplit(WLPART, ambfp); |
| 664 |
fputncomp(NCSAMP, ambfp); |
| 665 |
fputformat(AMBFMT, ambfp); |
| 666 |
fputc('\n', ambfp); |
| 667 |
putambmagic(ambfp); |
| 668 |
} else if (getheader(ambfp, amb_headline, NULL) < 0 || !hasambmagic(ambfp)) { |
| 669 |
if (--ntries > 0 && ftell(ambfp) == 0) { |
| 670 |
#ifdef F_SETLKW |
| 671 |
aflock(F_UNLCK); |
| 672 |
clearerr(ambfp); |
| 673 |
sleep(2); |
| 674 |
aflock(F_RDLCK); |
| 675 |
#else |
| 676 |
clearerr(ambfp); |
| 677 |
sleep(2); |
| 678 |
#endif |
| 679 |
goto retry; |
| 680 |
} |
| 681 |
error(USER, "bad/incompatible ambient file"); |
| 682 |
} |
| 683 |
if ((AMB_CNDX != CNDX) | (AMB_WLPART != WLPART)) { |
| 684 |
if (setspectrsamp(AMB_CNDX, AMB_WLPART) < 0) |
| 685 |
error(USER, "bad wavelength sampling in ambient file"); |
| 686 |
if (AMB_CNDX[3] == CNDX[3] && FABSEQ(AMB_WLPART[0],WLPART[0]) && |
| 687 |
FABSEQ(AMB_WLPART[3],WLPART[3])) { |
| 688 |
AMB_CNDX = CNDX; |
| 689 |
AMB_WLPART = WLPART; /* just the same */ |
| 690 |
} else |
| 691 |
error(WARNING, "different ambient file wavelength sampling"); |
| 692 |
} |
| 693 |
} |
| 694 |
|
| 695 |
|
| 696 |
static void |
| 697 |
avsave( /* insert and save an ambient value */ |
| 698 |
AMBVAL *av |
| 699 |
) |
| 700 |
{ |
| 701 |
avstore(av); |
| 702 |
if (ambfp == NULL) |
| 703 |
return; |
| 704 |
if (writambval(av, ambfp) < 0) |
| 705 |
goto writerr; |
| 706 |
if (++nunflshed >= AMBFLUSH) |
| 707 |
if (ambsync() == EOF) |
| 708 |
goto writerr; |
| 709 |
return; |
| 710 |
writerr: |
| 711 |
error(SYSTEM, "error writing to ambient file"); |
| 712 |
} |
| 713 |
|
| 714 |
|
| 715 |
static AMBVAL * |
| 716 |
avstore( /* allocate memory and save aval */ |
| 717 |
AMBVAL *aval |
| 718 |
) |
| 719 |
{ |
| 720 |
AMBVAL *av; |
| 721 |
double d; |
| 722 |
|
| 723 |
if ((av = newambval()) == NULL) |
| 724 |
error(SYSTEM, "out of memory in avstore"); |
| 725 |
memcpy(av, aval, AVSIZE); /* AVSIZE <= sizeof(AMBVAL) */ |
| 726 |
av->next = NULL; |
| 727 |
nambvals++; |
| 728 |
d = pbright(av->val); |
| 729 |
if (d > FTINY) { /* add to log sum for averaging */ |
| 730 |
avsum += log(d); |
| 731 |
navsum++; |
| 732 |
} |
| 733 |
avinsert(av); /* insert in our cache tree */ |
| 734 |
return(av); |
| 735 |
} |
| 736 |
|
| 737 |
|
| 738 |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
| 739 |
|
| 740 |
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
| 741 |
|
| 742 |
|
| 743 |
static AMBTREE * |
| 744 |
newambtree(void) /* allocate 8 ambient tree structs */ |
| 745 |
{ |
| 746 |
AMBTREE *atp, *upperlim; |
| 747 |
|
| 748 |
if (atfreelist == NULL) { /* get more nodes */ |
| 749 |
atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
| 750 |
if (atfreelist == NULL) |
| 751 |
return(NULL); |
| 752 |
/* link new free list */ |
| 753 |
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
| 754 |
for (atp = atfreelist; atp < upperlim; atp += 8) |
| 755 |
atp->kid = atp + 8; |
| 756 |
atp->kid = NULL; |
| 757 |
} |
| 758 |
atp = atfreelist; |
| 759 |
atfreelist = atp->kid; |
| 760 |
memset(atp, 0, 8*sizeof(AMBTREE)); |
| 761 |
return(atp); |
| 762 |
} |
| 763 |
|
| 764 |
|
| 765 |
static void |
| 766 |
freeambtree( /* free 8 ambient tree structs */ |
| 767 |
AMBTREE *atp |
| 768 |
) |
| 769 |
{ |
| 770 |
atp->kid = atfreelist; |
| 771 |
atfreelist = atp; |
| 772 |
} |
| 773 |
|
| 774 |
|
| 775 |
static void |
| 776 |
unloadatree( /* unload an ambient value tree */ |
| 777 |
AMBTREE *at, |
| 778 |
unloadtf_t *f |
| 779 |
) |
| 780 |
{ |
| 781 |
AMBVAL *av; |
| 782 |
int i; |
| 783 |
/* transfer values at this node */ |
| 784 |
for (av = at->alist; av != NULL; av = at->alist) { |
| 785 |
at->alist = av->next; |
| 786 |
av->next = NULL; |
| 787 |
(*f)(av); |
| 788 |
} |
| 789 |
if (at->kid == NULL) |
| 790 |
return; |
| 791 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
| 792 |
unloadatree(at->kid+i, f); |
| 793 |
freeambtree(at->kid); |
| 794 |
at->kid = NULL; |
| 795 |
} |
| 796 |
|
| 797 |
|
| 798 |
static void |
| 799 |
avfree(AMBVAL *av) |
| 800 |
{ |
| 801 |
free(av); |
| 802 |
} |
| 803 |
|
| 804 |
|
| 805 |
static void |
| 806 |
sortambvals(void) /* resort ambient values */ |
| 807 |
{ |
| 808 |
AMBTREE oldatrunk = atrunk; |
| 809 |
|
| 810 |
atrunk.alist = NULL; |
| 811 |
atrunk.kid = NULL; |
| 812 |
unloadatree(&oldatrunk, avinsert); |
| 813 |
} |
| 814 |
|
| 815 |
|
| 816 |
#ifdef F_SETLKW |
| 817 |
|
| 818 |
static void |
| 819 |
aflock( /* lock/unlock ambient file */ |
| 820 |
int typ |
| 821 |
) |
| 822 |
{ |
| 823 |
static struct flock fls; /* static so initialized to zeroes */ |
| 824 |
|
| 825 |
if (typ == fls.l_type) /* already called? */ |
| 826 |
return; |
| 827 |
|
| 828 |
fls.l_type = typ; |
| 829 |
do |
| 830 |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) != -1) |
| 831 |
return; |
| 832 |
while (errno == EINTR); |
| 833 |
|
| 834 |
error(SYSTEM, "cannot (un)lock ambient file"); |
| 835 |
} |
| 836 |
|
| 837 |
|
| 838 |
int |
| 839 |
ambsync(void) /* synchronize ambient file */ |
| 840 |
{ |
| 841 |
off_t flen; |
| 842 |
AMBVAL avs; |
| 843 |
int n; |
| 844 |
|
| 845 |
if (ambfp == NULL) /* no ambient file? */ |
| 846 |
return(0); |
| 847 |
/* gain appropriate access */ |
| 848 |
aflock(nunflshed ? F_WRLCK : F_RDLCK); |
| 849 |
/* see if file has grown */ |
| 850 |
if ((flen = lseek(fileno(ambfp), 0, SEEK_END)) < 0) |
| 851 |
goto seekerr; |
| 852 |
if ((n = flen - lastpos) > 0) { /* file has grown */ |
| 853 |
if (ambinp == NULL) { /* get new file pointer */ |
| 854 |
ambinp = fopen(ambfile, "rb"); |
| 855 |
if (ambinp == NULL) |
| 856 |
error(SYSTEM, "fopen failed in ambsync"); |
| 857 |
} |
| 858 |
if (fseeko(ambinp, lastpos, SEEK_SET) < 0) |
| 859 |
goto seekerr; |
| 860 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
| 861 |
if (!readambval(&avs, ambinp)) { |
| 862 |
sprintf(errmsg, |
| 863 |
"ambient file \"%s\" corrupted near character %ld", |
| 864 |
ambfile, flen - n); |
| 865 |
error(WARNING, errmsg); |
| 866 |
break; |
| 867 |
} |
| 868 |
avstore(&avs); |
| 869 |
n -= AMBVALSIZ; |
| 870 |
} |
| 871 |
lastpos = flen - n; /* check alignment */ |
| 872 |
if (n && lseek(fileno(ambfp), lastpos, SEEK_SET) < 0) |
| 873 |
goto seekerr; |
| 874 |
} |
| 875 |
n = fflush(ambfp); /* calls write() at last */ |
| 876 |
lastpos += (off_t)nunflshed*AMBVALSIZ; |
| 877 |
aflock(F_UNLCK); /* release file */ |
| 878 |
nunflshed = 0; |
| 879 |
return(n); |
| 880 |
seekerr: |
| 881 |
error(SYSTEM, "seek failed in ambsync"); |
| 882 |
return(EOF); /* pro forma return */ |
| 883 |
} |
| 884 |
|
| 885 |
#else /* ! F_SETLKW */ |
| 886 |
|
| 887 |
int |
| 888 |
ambsync(void) /* flush ambient file */ |
| 889 |
{ |
| 890 |
if (ambfp == NULL) |
| 891 |
return(0); |
| 892 |
nunflshed = 0; |
| 893 |
return(fflush(ambfp)); |
| 894 |
} |
| 895 |
|
| 896 |
#endif /* ! F_SETLKW */ |
