| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: ambient.c,v 2.49 2003/05/15 05:13:35 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* ambient.c - routines dealing with ambient (inter-reflected) component. |
| 6 |
* |
| 7 |
* Declarations of external symbols in ambient.h |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "copyright.h" |
| 11 |
|
| 12 |
#include "platform.h" |
| 13 |
#include "ray.h" |
| 14 |
#include "otypes.h" |
| 15 |
#include "ambient.h" |
| 16 |
#include "random.h" |
| 17 |
|
| 18 |
#ifndef OCTSCALE |
| 19 |
#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */ |
| 20 |
#endif |
| 21 |
|
| 22 |
extern char *shm_boundary; /* memory sharing boundary */ |
| 23 |
|
| 24 |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
| 25 |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
| 26 |
|
| 27 |
double maxarad; /* maximum ambient radius */ |
| 28 |
double minarad; /* minimum ambient radius */ |
| 29 |
|
| 30 |
static AMBTREE atrunk; /* our ambient trunk node */ |
| 31 |
|
| 32 |
static FILE *ambfp = NULL; /* ambient file pointer */ |
| 33 |
static int nunflshed = 0; /* number of unflushed ambient values */ |
| 34 |
|
| 35 |
#ifndef SORT_THRESH |
| 36 |
#ifdef SMLMEM |
| 37 |
#define SORT_THRESH ((3L<<20)/sizeof(AMBVAL)) |
| 38 |
#else |
| 39 |
#define SORT_THRESH ((9L<<20)/sizeof(AMBVAL)) |
| 40 |
#endif |
| 41 |
#endif |
| 42 |
#ifndef SORT_INTVL |
| 43 |
#define SORT_INTVL (SORT_THRESH<<1) |
| 44 |
#endif |
| 45 |
#ifndef MAX_SORT_INTVL |
| 46 |
#define MAX_SORT_INTVL (SORT_INTVL<<6) |
| 47 |
#endif |
| 48 |
|
| 49 |
static double avsum = 0.; /* computed ambient value sum (log) */ |
| 50 |
static unsigned int navsum = 0; /* number of values in avsum */ |
| 51 |
static unsigned int nambvals = 0; /* total number of indirect values */ |
| 52 |
static unsigned int nambshare = 0; /* number of values from file */ |
| 53 |
static unsigned long ambclock = 0; /* ambient access clock */ |
| 54 |
static unsigned long lastsort = 0; /* time of last value sort */ |
| 55 |
static long sortintvl = SORT_INTVL; /* time until next sort */ |
| 56 |
static FILE *ambinp = NULL; /* auxiliary file for input */ |
| 57 |
static long lastpos = -1; /* last flush position */ |
| 58 |
|
| 59 |
#define MAXACLOCK (1L<<30) /* clock turnover value */ |
| 60 |
/* |
| 61 |
* Track access times unless we are sharing ambient values |
| 62 |
* through memory on a multiprocessor, when we want to avoid |
| 63 |
* claiming our own memory (copy on write). Go ahead anyway |
| 64 |
* if more than two thirds of our values are unshared. |
| 65 |
* Compile with -Dtracktime=0 to turn this code off. |
| 66 |
*/ |
| 67 |
#ifndef tracktime |
| 68 |
#define tracktime (shm_boundary == NULL || nambvals > 3*nambshare) |
| 69 |
#endif |
| 70 |
|
| 71 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
| 72 |
|
| 73 |
#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL)) |
| 74 |
#define freeav(av) free((void *)av); |
| 75 |
|
| 76 |
static void initambfile(), avsave(), avinsert(), sortambvals(), unloadatree(); |
| 77 |
static int avlmemi(); |
| 78 |
static AMBVAL *avstore(); |
| 79 |
#ifdef F_SETLKW |
| 80 |
static void aflock(); |
| 81 |
#endif |
| 82 |
|
| 83 |
|
| 84 |
void |
| 85 |
setambres(ar) /* set ambient resolution */ |
| 86 |
int ar; |
| 87 |
{ |
| 88 |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
| 89 |
/* set min & max radii */ |
| 90 |
if (ar <= 0) { |
| 91 |
minarad = 0; |
| 92 |
maxarad = thescene.cusize / 2.0; |
| 93 |
} else { |
| 94 |
minarad = thescene.cusize / ar; |
| 95 |
maxarad = 64 * minarad; /* heuristic */ |
| 96 |
if (maxarad > thescene.cusize / 2.0) |
| 97 |
maxarad = thescene.cusize / 2.0; |
| 98 |
} |
| 99 |
if (minarad <= FTINY) |
| 100 |
minarad = 10*FTINY; |
| 101 |
if (maxarad <= minarad) |
| 102 |
maxarad = 64 * minarad; |
| 103 |
} |
| 104 |
|
| 105 |
|
| 106 |
void |
| 107 |
setambacc(newa) /* set ambient accuracy */ |
| 108 |
double newa; |
| 109 |
{ |
| 110 |
double ambdiff; |
| 111 |
|
| 112 |
if (newa < 0.0) |
| 113 |
newa = 0.0; |
| 114 |
ambdiff = fabs(newa - ambacc); |
| 115 |
if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0) |
| 116 |
sortambvals(1); /* rebuild tree */ |
| 117 |
} |
| 118 |
|
| 119 |
|
| 120 |
void |
| 121 |
setambient() /* initialize calculation */ |
| 122 |
{ |
| 123 |
int readonly = 0; |
| 124 |
long pos, flen; |
| 125 |
AMBVAL amb; |
| 126 |
/* make sure we're fresh */ |
| 127 |
ambdone(); |
| 128 |
/* init ambient limits */ |
| 129 |
setambres(ambres); |
| 130 |
setambacc(ambacc); |
| 131 |
if (ambfile == NULL || !ambfile[0]) |
| 132 |
return; |
| 133 |
if (ambacc <= FTINY) { |
| 134 |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
| 135 |
ambfile); |
| 136 |
error(WARNING, errmsg); |
| 137 |
return; |
| 138 |
} |
| 139 |
/* open ambient file */ |
| 140 |
if ((ambfp = fopen(ambfile, "r+")) == NULL) |
| 141 |
readonly = (ambfp = fopen(ambfile, "r")) != NULL; |
| 142 |
if (ambfp != NULL) { |
| 143 |
initambfile(0); /* file exists */ |
| 144 |
pos = ftell(ambfp); |
| 145 |
while (readambval(&amb, ambfp)) |
| 146 |
avinsert(avstore(&amb)); |
| 147 |
nambshare = nambvals; /* share loaded values */ |
| 148 |
if (readonly) { |
| 149 |
sprintf(errmsg, |
| 150 |
"loaded %u values from read-only ambient file", |
| 151 |
nambvals); |
| 152 |
error(WARNING, errmsg); |
| 153 |
fclose(ambfp); /* close file so no writes */ |
| 154 |
ambfp = NULL; |
| 155 |
return; /* avoid ambsync() */ |
| 156 |
} |
| 157 |
/* align file pointer */ |
| 158 |
pos += (long)nambvals*AMBVALSIZ; |
| 159 |
flen = lseek(fileno(ambfp), (off_t)0L, 2); |
| 160 |
if (flen != pos) { |
| 161 |
sprintf(errmsg, |
| 162 |
"ignoring last %ld values in ambient file (corrupted)", |
| 163 |
(flen - pos)/AMBVALSIZ); |
| 164 |
error(WARNING, errmsg); |
| 165 |
fseek(ambfp, pos, 0); |
| 166 |
ftruncate(fileno(ambfp), (off_t)pos); |
| 167 |
} |
| 168 |
} else if ((ambfp = fopen(ambfile, "w+")) != NULL) { |
| 169 |
initambfile(1); /* else create new file */ |
| 170 |
} else { |
| 171 |
sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile); |
| 172 |
error(SYSTEM, errmsg); |
| 173 |
} |
| 174 |
nunflshed++; /* lie */ |
| 175 |
ambsync(); |
| 176 |
} |
| 177 |
|
| 178 |
|
| 179 |
void |
| 180 |
ambdone() /* close ambient file and free memory */ |
| 181 |
{ |
| 182 |
if (ambfp != NULL) { /* close ambient file */ |
| 183 |
ambsync(); |
| 184 |
fclose(ambfp); |
| 185 |
ambfp = NULL; |
| 186 |
if (ambinp != NULL) { |
| 187 |
fclose(ambinp); |
| 188 |
ambinp = NULL; |
| 189 |
} |
| 190 |
lastpos = -1; |
| 191 |
} |
| 192 |
/* free ambient tree */ |
| 193 |
unloadatree(&atrunk, free); |
| 194 |
/* reset state variables */ |
| 195 |
avsum = 0.; |
| 196 |
navsum = 0; |
| 197 |
nambvals = 0; |
| 198 |
nambshare = 0; |
| 199 |
ambclock = 0; |
| 200 |
lastsort = 0; |
| 201 |
sortintvl = SORT_INTVL; |
| 202 |
} |
| 203 |
|
| 204 |
|
| 205 |
void |
| 206 |
ambnotify(obj) /* record new modifier */ |
| 207 |
OBJECT obj; |
| 208 |
{ |
| 209 |
static int hitlimit = 0; |
| 210 |
register OBJREC *o; |
| 211 |
register char **amblp; |
| 212 |
|
| 213 |
if (obj == OVOID) { /* starting over */ |
| 214 |
ambset[0] = 0; |
| 215 |
hitlimit = 0; |
| 216 |
return; |
| 217 |
} |
| 218 |
o = objptr(obj); |
| 219 |
if (hitlimit || !ismodifier(o->otype)) |
| 220 |
return; |
| 221 |
for (amblp = amblist; *amblp != NULL; amblp++) |
| 222 |
if (!strcmp(o->oname, *amblp)) { |
| 223 |
if (ambset[0] >= MAXASET) { |
| 224 |
error(WARNING, "too many modifiers in ambient list"); |
| 225 |
hitlimit++; |
| 226 |
return; /* should this be fatal? */ |
| 227 |
} |
| 228 |
insertelem(ambset, obj); |
| 229 |
return; |
| 230 |
} |
| 231 |
} |
| 232 |
|
| 233 |
|
| 234 |
void |
| 235 |
ambient(acol, r, nrm) /* compute ambient component for ray */ |
| 236 |
COLOR acol; |
| 237 |
register RAY *r; |
| 238 |
FVECT nrm; |
| 239 |
{ |
| 240 |
static int rdepth = 0; /* ambient recursion */ |
| 241 |
double d, l; |
| 242 |
|
| 243 |
if (ambdiv <= 0) /* no ambient calculation */ |
| 244 |
goto dumbamb; |
| 245 |
/* check number of bounces */ |
| 246 |
if (rdepth >= ambounce) |
| 247 |
goto dumbamb; |
| 248 |
/* check ambient list */ |
| 249 |
if (ambincl != -1 && r->ro != NULL && |
| 250 |
ambincl != inset(ambset, r->ro->omod)) |
| 251 |
goto dumbamb; |
| 252 |
|
| 253 |
if (ambacc <= FTINY) { /* no ambient storage */ |
| 254 |
rdepth++; |
| 255 |
d = doambient(acol, r, r->rweight, NULL, NULL); |
| 256 |
rdepth--; |
| 257 |
if (d <= FTINY) |
| 258 |
goto dumbamb; |
| 259 |
return; |
| 260 |
} |
| 261 |
|
| 262 |
if (tracktime) /* sort to minimize thrashing */ |
| 263 |
sortambvals(0); |
| 264 |
/* get ambient value */ |
| 265 |
setcolor(acol, 0.0, 0.0, 0.0); |
| 266 |
d = sumambient(acol, r, nrm, rdepth, |
| 267 |
&atrunk, thescene.cuorg, thescene.cusize); |
| 268 |
if (d > FTINY) { |
| 269 |
scalecolor(acol, 1.0/d); |
| 270 |
return; |
| 271 |
} |
| 272 |
rdepth++; /* need to cache new value */ |
| 273 |
d = makeambient(acol, r, nrm, rdepth-1); |
| 274 |
rdepth--; |
| 275 |
if (d > FTINY) |
| 276 |
return; |
| 277 |
dumbamb: /* return global value */ |
| 278 |
copycolor(acol, ambval); |
| 279 |
if (ambvwt <= 0 | navsum == 0) |
| 280 |
return; |
| 281 |
l = bright(ambval); /* average in computations */ |
| 282 |
if (l > FTINY) { |
| 283 |
d = (log(l)*(double)ambvwt + avsum) / |
| 284 |
(double)(ambvwt + navsum); |
| 285 |
d = exp(d) / l; |
| 286 |
scalecolor(acol, d); /* apply color of ambval */ |
| 287 |
} else { |
| 288 |
d = exp( avsum / (double)navsum ); |
| 289 |
setcolor(acol, d, d, d); /* neutral color */ |
| 290 |
} |
| 291 |
} |
| 292 |
|
| 293 |
|
| 294 |
double |
| 295 |
sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */ |
| 296 |
COLOR acol; |
| 297 |
register RAY *r; |
| 298 |
FVECT rn; |
| 299 |
int al; |
| 300 |
AMBTREE *at; |
| 301 |
FVECT c0; |
| 302 |
double s; |
| 303 |
{ |
| 304 |
double d, e1, e2, wt, wsum; |
| 305 |
COLOR ct; |
| 306 |
FVECT ck0; |
| 307 |
int i; |
| 308 |
register int j; |
| 309 |
register AMBVAL *av; |
| 310 |
|
| 311 |
wsum = 0.0; |
| 312 |
/* do this node */ |
| 313 |
for (av = at->alist; av != NULL; av = av->next) { |
| 314 |
double rn_dot = -2.0; |
| 315 |
if (tracktime) |
| 316 |
av->latick = ambclock; |
| 317 |
/* |
| 318 |
* Ambient level test. |
| 319 |
*/ |
| 320 |
if (av->lvl > al) /* list sorted, so this works */ |
| 321 |
break; |
| 322 |
if (av->weight < r->rweight-FTINY) |
| 323 |
continue; |
| 324 |
/* |
| 325 |
* Ambient radius test. |
| 326 |
*/ |
| 327 |
d = av->pos[0] - r->rop[0]; |
| 328 |
e1 = d * d; |
| 329 |
d = av->pos[1] - r->rop[1]; |
| 330 |
e1 += d * d; |
| 331 |
d = av->pos[2] - r->rop[2]; |
| 332 |
e1 += d * d; |
| 333 |
e1 /= av->rad * av->rad; |
| 334 |
if (e1 > ambacc*ambacc*1.21) |
| 335 |
continue; |
| 336 |
/* |
| 337 |
* Direction test using closest normal. |
| 338 |
*/ |
| 339 |
d = DOT(av->dir, r->ron); |
| 340 |
if (rn != r->ron) { |
| 341 |
rn_dot = DOT(av->dir, rn); |
| 342 |
if (rn_dot > 1.0-FTINY) |
| 343 |
rn_dot = 1.0-FTINY; |
| 344 |
if (rn_dot >= d-FTINY) { |
| 345 |
d = rn_dot; |
| 346 |
rn_dot = -2.0; |
| 347 |
} |
| 348 |
} |
| 349 |
e2 = (1.0 - d) * r->rweight; |
| 350 |
if (e2 < 0.0) e2 = 0.0; |
| 351 |
if (e1 + e2 > ambacc*ambacc*1.21) |
| 352 |
continue; |
| 353 |
/* |
| 354 |
* Ray behind test. |
| 355 |
*/ |
| 356 |
d = 0.0; |
| 357 |
for (j = 0; j < 3; j++) |
| 358 |
d += (r->rop[j] - av->pos[j]) * |
| 359 |
(av->dir[j] + r->ron[j]); |
| 360 |
if (d*0.5 < -minarad*ambacc-.001) |
| 361 |
continue; |
| 362 |
/* |
| 363 |
* Jittering final test reduces image artifacts. |
| 364 |
*/ |
| 365 |
e1 = sqrt(e1); |
| 366 |
e2 = sqrt(e2); |
| 367 |
wt = e1 + e2; |
| 368 |
if (wt > ambacc*(.9+.2*urand(9015+samplendx))) |
| 369 |
continue; |
| 370 |
/* |
| 371 |
* Recompute directional error using perturbed normal |
| 372 |
*/ |
| 373 |
if (rn_dot > 0.0) { |
| 374 |
e2 = sqrt((1.0 - rn_dot)*r->rweight); |
| 375 |
wt = e1 + e2; |
| 376 |
} |
| 377 |
if (wt <= 1e-3) |
| 378 |
wt = 1e3; |
| 379 |
else |
| 380 |
wt = 1.0 / wt; |
| 381 |
wsum += wt; |
| 382 |
extambient(ct, av, r->rop, rn); |
| 383 |
scalecolor(ct, wt); |
| 384 |
addcolor(acol, ct); |
| 385 |
} |
| 386 |
if (at->kid == NULL) |
| 387 |
return(wsum); |
| 388 |
/* do children */ |
| 389 |
s *= 0.5; |
| 390 |
for (i = 0; i < 8; i++) { |
| 391 |
for (j = 0; j < 3; j++) { |
| 392 |
ck0[j] = c0[j]; |
| 393 |
if (1<<j & i) |
| 394 |
ck0[j] += s; |
| 395 |
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
| 396 |
break; |
| 397 |
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
| 398 |
break; |
| 399 |
} |
| 400 |
if (j == 3) |
| 401 |
wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s); |
| 402 |
} |
| 403 |
return(wsum); |
| 404 |
} |
| 405 |
|
| 406 |
|
| 407 |
double |
| 408 |
makeambient(acol, r, rn, al) /* make a new ambient value */ |
| 409 |
COLOR acol; |
| 410 |
register RAY *r; |
| 411 |
FVECT rn; |
| 412 |
int al; |
| 413 |
{ |
| 414 |
AMBVAL amb; |
| 415 |
FVECT gp, gd; |
| 416 |
/* compute weight */ |
| 417 |
amb.weight = pow(AVGREFL, (double)al); |
| 418 |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
| 419 |
amb.weight = r->rweight; |
| 420 |
/* compute ambient */ |
| 421 |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
| 422 |
if (amb.rad <= FTINY) |
| 423 |
return(0.0); |
| 424 |
/* store it */ |
| 425 |
VCOPY(amb.pos, r->rop); |
| 426 |
VCOPY(amb.dir, r->ron); |
| 427 |
amb.lvl = al; |
| 428 |
copycolor(amb.val, acol); |
| 429 |
VCOPY(amb.gpos, gp); |
| 430 |
VCOPY(amb.gdir, gd); |
| 431 |
/* insert into tree */ |
| 432 |
avsave(&amb); /* and save to file */ |
| 433 |
if (rn != r->ron) |
| 434 |
extambient(acol, &amb, r->rop, rn); /* texture */ |
| 435 |
return(amb.rad); |
| 436 |
} |
| 437 |
|
| 438 |
|
| 439 |
void |
| 440 |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
| 441 |
COLOR cr; |
| 442 |
register AMBVAL *ap; |
| 443 |
FVECT pv, nv; |
| 444 |
{ |
| 445 |
FVECT v1; |
| 446 |
register int i; |
| 447 |
double d; |
| 448 |
|
| 449 |
d = 1.0; /* zeroeth order */ |
| 450 |
/* gradient due to translation */ |
| 451 |
for (i = 0; i < 3; i++) |
| 452 |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
| 453 |
/* gradient due to rotation */ |
| 454 |
VCROSS(v1, ap->dir, nv); |
| 455 |
d += DOT(ap->gdir, v1); |
| 456 |
if (d <= 0.0) { |
| 457 |
setcolor(cr, 0.0, 0.0, 0.0); |
| 458 |
return; |
| 459 |
} |
| 460 |
copycolor(cr, ap->val); |
| 461 |
scalecolor(cr, d); |
| 462 |
} |
| 463 |
|
| 464 |
|
| 465 |
static void |
| 466 |
initambfile(creat) /* initialize ambient file */ |
| 467 |
int creat; |
| 468 |
{ |
| 469 |
extern char *progname, *octname; |
| 470 |
static char *mybuf = NULL; |
| 471 |
|
| 472 |
#ifdef F_SETLKW |
| 473 |
aflock(creat ? F_WRLCK : F_RDLCK); |
| 474 |
#endif |
| 475 |
SET_FILE_BINARY(ambfp); |
| 476 |
if (mybuf == NULL) |
| 477 |
mybuf = (char *)bmalloc(BUFSIZ+8); |
| 478 |
setbuf(ambfp, mybuf); |
| 479 |
if (creat) { /* new file */ |
| 480 |
newheader("RADIANCE", ambfp); |
| 481 |
fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ", |
| 482 |
progname, colval(ambval,RED), |
| 483 |
colval(ambval,GRN), colval(ambval,BLU), |
| 484 |
ambvwt, ambounce, ambacc); |
| 485 |
fprintf(ambfp, "-ad %d -as %d -ar %d ", |
| 486 |
ambdiv, ambssamp, ambres); |
| 487 |
if (octname != NULL) |
| 488 |
printargs(1, &octname, ambfp); |
| 489 |
else |
| 490 |
fputc('\n', ambfp); |
| 491 |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
| 492 |
fputnow(ambfp); |
| 493 |
fputformat(AMBFMT, ambfp); |
| 494 |
putc('\n', ambfp); |
| 495 |
putambmagic(ambfp); |
| 496 |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
| 497 |
error(USER, "bad ambient file"); |
| 498 |
} |
| 499 |
|
| 500 |
|
| 501 |
static void |
| 502 |
avsave(av) /* insert and save an ambient value */ |
| 503 |
AMBVAL *av; |
| 504 |
{ |
| 505 |
avinsert(avstore(av)); |
| 506 |
if (ambfp == NULL) |
| 507 |
return; |
| 508 |
if (writambval(av, ambfp) < 0) |
| 509 |
goto writerr; |
| 510 |
if (++nunflshed >= AMBFLUSH) |
| 511 |
if (ambsync() == EOF) |
| 512 |
goto writerr; |
| 513 |
return; |
| 514 |
writerr: |
| 515 |
error(SYSTEM, "error writing to ambient file"); |
| 516 |
} |
| 517 |
|
| 518 |
|
| 519 |
static AMBVAL * |
| 520 |
avstore(aval) /* allocate memory and store aval */ |
| 521 |
register AMBVAL *aval; |
| 522 |
{ |
| 523 |
register AMBVAL *av; |
| 524 |
double d; |
| 525 |
|
| 526 |
if ((av = newambval()) == NULL) |
| 527 |
error(SYSTEM, "out of memory in avstore"); |
| 528 |
copystruct(av, aval); |
| 529 |
av->latick = ambclock; |
| 530 |
av->next = NULL; |
| 531 |
nambvals++; |
| 532 |
d = bright(av->val); |
| 533 |
if (d > FTINY) { /* add to log sum for averaging */ |
| 534 |
avsum += log(d); |
| 535 |
navsum++; |
| 536 |
} |
| 537 |
return(av); |
| 538 |
} |
| 539 |
|
| 540 |
|
| 541 |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
| 542 |
|
| 543 |
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
| 544 |
|
| 545 |
|
| 546 |
static AMBTREE * |
| 547 |
newambtree() /* allocate 8 ambient tree structs */ |
| 548 |
{ |
| 549 |
register AMBTREE *atp, *upperlim; |
| 550 |
|
| 551 |
if (atfreelist == NULL) { /* get more nodes */ |
| 552 |
atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
| 553 |
if (atfreelist == NULL) |
| 554 |
return(NULL); |
| 555 |
/* link new free list */ |
| 556 |
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
| 557 |
for (atp = atfreelist; atp < upperlim; atp += 8) |
| 558 |
atp->kid = atp + 8; |
| 559 |
atp->kid = NULL; |
| 560 |
} |
| 561 |
atp = atfreelist; |
| 562 |
atfreelist = atp->kid; |
| 563 |
bzero((char *)atp, 8*sizeof(AMBTREE)); |
| 564 |
return(atp); |
| 565 |
} |
| 566 |
|
| 567 |
|
| 568 |
static void |
| 569 |
freeambtree(atp) /* free 8 ambient tree structs */ |
| 570 |
AMBTREE *atp; |
| 571 |
{ |
| 572 |
atp->kid = atfreelist; |
| 573 |
atfreelist = atp; |
| 574 |
} |
| 575 |
|
| 576 |
|
| 577 |
static void |
| 578 |
avinsert(av) /* insert ambient value in our tree */ |
| 579 |
register AMBVAL *av; |
| 580 |
{ |
| 581 |
register AMBTREE *at; |
| 582 |
register AMBVAL *ap; |
| 583 |
AMBVAL avh; |
| 584 |
FVECT ck0; |
| 585 |
double s; |
| 586 |
int branch; |
| 587 |
register int i; |
| 588 |
|
| 589 |
if (av->rad <= 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*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 |
break; |
| 611 |
av->next = ap->next; |
| 612 |
ap->next = av; |
| 613 |
at->alist = avh.next; |
| 614 |
} |
| 615 |
|
| 616 |
|
| 617 |
static void |
| 618 |
unloadatree(at, f) /* unload an ambient value tree */ |
| 619 |
register AMBTREE *at; |
| 620 |
void (*f)(); |
| 621 |
{ |
| 622 |
register AMBVAL *av; |
| 623 |
register int i; |
| 624 |
/* transfer values at this node */ |
| 625 |
for (av = at->alist; av != NULL; av = at->alist) { |
| 626 |
at->alist = av->next; |
| 627 |
(*f)(av); |
| 628 |
} |
| 629 |
if (at->kid == NULL) |
| 630 |
return; |
| 631 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
| 632 |
unloadatree(at->kid+i, f); |
| 633 |
freeambtree(at->kid); |
| 634 |
at->kid = NULL; |
| 635 |
} |
| 636 |
|
| 637 |
|
| 638 |
static struct avl { |
| 639 |
AMBVAL *p; |
| 640 |
unsigned long t; |
| 641 |
} *avlist1; /* ambient value list with ticks */ |
| 642 |
static AMBVAL **avlist2; /* memory positions for sorting */ |
| 643 |
static int i_avlist; /* index for lists */ |
| 644 |
|
| 645 |
|
| 646 |
static int |
| 647 |
av2list(av) |
| 648 |
register AMBVAL *av; |
| 649 |
{ |
| 650 |
#ifdef DEBUG |
| 651 |
if (i_avlist >= nambvals) |
| 652 |
error(CONSISTENCY, "too many ambient values in av2list1"); |
| 653 |
#endif |
| 654 |
avlist1[i_avlist].p = avlist2[i_avlist] = av; |
| 655 |
avlist1[i_avlist++].t = av->latick; |
| 656 |
} |
| 657 |
|
| 658 |
|
| 659 |
static int |
| 660 |
alatcmp(av1, av2) /* compare ambient values for MRA */ |
| 661 |
struct avl *av1, *av2; |
| 662 |
{ |
| 663 |
register long lc = av2->t - av1->t; |
| 664 |
return(lc<0 ? -1 : lc>0 ? 1 : 0); |
| 665 |
} |
| 666 |
|
| 667 |
|
| 668 |
/* GW NOTE 2002/10/3: |
| 669 |
* I used to compare AMBVAL pointers, but found that this was the |
| 670 |
* cause of a serious consistency error with gcc, since the optimizer |
| 671 |
* uses some dangerous trick in pointer subtraction that |
| 672 |
* assumes pointers differ by exact struct size increments. |
| 673 |
*/ |
| 674 |
static int |
| 675 |
aposcmp(avp1, avp2) /* compare ambient value positions */ |
| 676 |
const void *avp1, *avp2; |
| 677 |
{ |
| 678 |
register long diff = *(char * const *)avp1 - *(char * const *)avp2; |
| 679 |
if (diff < 0) |
| 680 |
return(-1); |
| 681 |
return(diff > 0); |
| 682 |
} |
| 683 |
|
| 684 |
#if 1 |
| 685 |
static int |
| 686 |
avlmemi(avaddr) /* find list position from address */ |
| 687 |
AMBVAL *avaddr; |
| 688 |
{ |
| 689 |
register AMBVAL **avlpp; |
| 690 |
|
| 691 |
avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2, |
| 692 |
nambvals, sizeof(AMBVAL *), aposcmp); |
| 693 |
if (avlpp == NULL) |
| 694 |
error(CONSISTENCY, "address not found in avlmemi"); |
| 695 |
return(avlpp - avlist2); |
| 696 |
} |
| 697 |
#else |
| 698 |
#define avlmemi(avaddr) ((AMBVAL **)bsearch((char *)&avaddr,(char *)avlist2, \ |
| 699 |
nambvals,sizeof(AMBVAL *),aposcmp) - avlist2) |
| 700 |
#endif |
| 701 |
|
| 702 |
|
| 703 |
static void |
| 704 |
sortambvals(always) /* resort ambient values */ |
| 705 |
int always; |
| 706 |
{ |
| 707 |
AMBTREE oldatrunk; |
| 708 |
AMBVAL tav, *tap, *pnext; |
| 709 |
register int i, j; |
| 710 |
/* see if it's time yet */ |
| 711 |
if (!always && (ambclock++ < lastsort+sortintvl || |
| 712 |
nambvals < SORT_THRESH)) |
| 713 |
return; |
| 714 |
/* |
| 715 |
* The idea here is to minimize memory thrashing |
| 716 |
* in VM systems by improving reference locality. |
| 717 |
* We do this by periodically sorting our stored ambient |
| 718 |
* values in memory in order of most recently to least |
| 719 |
* recently accessed. This ordering was chosen so that new |
| 720 |
* ambient values (which tend to be less important) go into |
| 721 |
* higher memory with the infrequently accessed values. |
| 722 |
* Since we expect our values to need sorting less |
| 723 |
* frequently as the process continues, we double our |
| 724 |
* waiting interval after each call. |
| 725 |
* This routine is also called by setambacc() with |
| 726 |
* the "always" parameter set to 1 so that the ambient |
| 727 |
* tree will be rebuilt with the new accuracy parameter. |
| 728 |
*/ |
| 729 |
if (tracktime) { /* allocate pointer arrays to sort */ |
| 730 |
avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
| 731 |
avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl)); |
| 732 |
} else { |
| 733 |
avlist2 = NULL; |
| 734 |
avlist1 = NULL; |
| 735 |
} |
| 736 |
if (avlist1 == NULL) { /* no time tracking -- rebuild tree? */ |
| 737 |
if (avlist2 != NULL) |
| 738 |
free((void *)avlist2); |
| 739 |
if (always) { /* rebuild without sorting */ |
| 740 |
copystruct(&oldatrunk, &atrunk); |
| 741 |
atrunk.alist = NULL; |
| 742 |
atrunk.kid = NULL; |
| 743 |
unloadatree(&oldatrunk, avinsert); |
| 744 |
} |
| 745 |
} else { /* sort memory by last access time */ |
| 746 |
/* |
| 747 |
* Sorting memory is tricky because it isn't contiguous. |
| 748 |
* We have to sort an array of pointers by MRA and also |
| 749 |
* by memory position. We then copy values in "loops" |
| 750 |
* to minimize memory hits. Nevertheless, we will visit |
| 751 |
* everyone at least twice, and this is an expensive process |
| 752 |
* when we're thrashing, which is when we need to do it. |
| 753 |
*/ |
| 754 |
#ifdef DEBUG |
| 755 |
sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...", |
| 756 |
nambvals, ambclock); |
| 757 |
eputs(errmsg); |
| 758 |
#endif |
| 759 |
i_avlist = 0; |
| 760 |
unloadatree(&atrunk, av2list); /* empty current tree */ |
| 761 |
#ifdef DEBUG |
| 762 |
if (i_avlist < nambvals) |
| 763 |
error(CONSISTENCY, "missing ambient values in sortambvals"); |
| 764 |
#endif |
| 765 |
qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp); |
| 766 |
qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp); |
| 767 |
for (i = 0; i < nambvals; i++) { |
| 768 |
if (avlist1[i].p == NULL) |
| 769 |
continue; |
| 770 |
tap = avlist2[i]; |
| 771 |
copystruct(&tav, tap); |
| 772 |
for (j = i; (pnext = avlist1[j].p) != tap; |
| 773 |
j = avlmemi(pnext)) { |
| 774 |
copystruct(avlist2[j], pnext); |
| 775 |
avinsert(avlist2[j]); |
| 776 |
avlist1[j].p = NULL; |
| 777 |
} |
| 778 |
copystruct(avlist2[j], &tav); |
| 779 |
avinsert(avlist2[j]); |
| 780 |
avlist1[j].p = NULL; |
| 781 |
} |
| 782 |
free((void *)avlist1); |
| 783 |
free((void *)avlist2); |
| 784 |
/* compute new sort interval */ |
| 785 |
sortintvl = ambclock - lastsort; |
| 786 |
if (sortintvl >= MAX_SORT_INTVL/2) |
| 787 |
sortintvl = MAX_SORT_INTVL; |
| 788 |
else |
| 789 |
sortintvl <<= 1; /* wait twice as long next */ |
| 790 |
#ifdef DEBUG |
| 791 |
eputs("done\n"); |
| 792 |
#endif |
| 793 |
} |
| 794 |
if (ambclock >= MAXACLOCK) |
| 795 |
ambclock = MAXACLOCK/2; |
| 796 |
lastsort = ambclock; |
| 797 |
} |
| 798 |
|
| 799 |
|
| 800 |
#ifdef F_SETLKW |
| 801 |
|
| 802 |
static void |
| 803 |
aflock(typ) /* lock/unlock ambient file */ |
| 804 |
int typ; |
| 805 |
{ |
| 806 |
static struct flock fls; /* static so initialized to zeroes */ |
| 807 |
|
| 808 |
fls.l_type = typ; |
| 809 |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
| 810 |
error(SYSTEM, "cannot (un)lock ambient file"); |
| 811 |
} |
| 812 |
|
| 813 |
|
| 814 |
int |
| 815 |
ambsync() /* synchronize ambient file */ |
| 816 |
{ |
| 817 |
long flen; |
| 818 |
AMBVAL avs; |
| 819 |
register int n; |
| 820 |
|
| 821 |
if (nunflshed == 0) |
| 822 |
return(0); |
| 823 |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
| 824 |
goto syncend; |
| 825 |
/* gain exclusive access */ |
| 826 |
aflock(F_WRLCK); |
| 827 |
/* see if file has grown */ |
| 828 |
if ((flen = lseek(fileno(ambfp), (off_t)0L, 2)) < 0) |
| 829 |
goto seekerr; |
| 830 |
if (n = flen - lastpos) { /* file has grown */ |
| 831 |
if (ambinp == NULL) { /* use duplicate filedes */ |
| 832 |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
| 833 |
if (ambinp == NULL) |
| 834 |
error(SYSTEM, "fdopen failed in ambsync"); |
| 835 |
} |
| 836 |
if (fseek(ambinp, lastpos, 0) < 0) |
| 837 |
goto seekerr; |
| 838 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
| 839 |
if (!readambval(&avs, ambinp)) { |
| 840 |
sprintf(errmsg, |
| 841 |
"ambient file \"%s\" corrupted near character %ld", |
| 842 |
ambfile, flen - n); |
| 843 |
error(WARNING, errmsg); |
| 844 |
break; |
| 845 |
} |
| 846 |
avinsert(avstore(&avs)); |
| 847 |
n -= AMBVALSIZ; |
| 848 |
} |
| 849 |
/*** seek always as safety measure |
| 850 |
if (n) ***/ /* alignment */ |
| 851 |
if (lseek(fileno(ambfp), (off_t)(flen-n), 0) < 0) |
| 852 |
goto seekerr; |
| 853 |
} |
| 854 |
#ifdef DEBUG |
| 855 |
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
| 856 |
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
| 857 |
ambfp->_ptr - ambfp->_base, |
| 858 |
nunflshed*AMBVALSIZ); |
| 859 |
error(CONSISTENCY, errmsg); |
| 860 |
} |
| 861 |
#endif |
| 862 |
syncend: |
| 863 |
n = fflush(ambfp); /* calls write() at last */ |
| 864 |
if ((lastpos = lseek(fileno(ambfp), (off_t)0L, 1)) < 0) |
| 865 |
goto seekerr; |
| 866 |
aflock(F_UNLCK); /* release file */ |
| 867 |
nunflshed = 0; |
| 868 |
return(n); |
| 869 |
seekerr: |
| 870 |
error(SYSTEM, "seek failed in ambsync"); |
| 871 |
} |
| 872 |
|
| 873 |
#else |
| 874 |
|
| 875 |
int |
| 876 |
ambsync() /* flush ambient file */ |
| 877 |
{ |
| 878 |
if (nunflshed == 0) |
| 879 |
return(0); |
| 880 |
nunflshed = 0; |
| 881 |
return(fflush(ambfp)); |
| 882 |
} |
| 883 |
|
| 884 |
#endif |
