| 7 |
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* External symbols declared in source.h |
| 8 |
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*/ |
| 9 |
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|
| 10 |
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#include "copyright.h" |
| 11 |
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|
| 10 |
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#include "ray.h" |
| 11 |
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|
| 12 |
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#include "otypes.h" |
| 13 |
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|
| 16 |
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#include "otspecial.h" |
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|
| 14 |
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#include "source.h" |
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|
| 16 |
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#include "random.h" |
| 288 |
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} |
| 289 |
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return(0); |
| 290 |
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} |
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|
| 296 |
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|
| 297 |
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#if SHADCACHE /* preemptive shadow checking */ |
| 298 |
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#define ABS(x) ((x)>0 ? (x) : -(x)) |
| 299 |
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|
| 300 |
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static void /* find closest blockers to source */ |
| 301 |
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initobscache(SRCREC *srcp) |
| 302 |
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{ |
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int i; |
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int cachelen; |
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|
| 306 |
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if (srcp->sflags & SDISTANT) |
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cachelen = 4*SHADCACHE*SHADCACHE; |
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else if (srcp->sflags & SFLAT) |
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cachelen = SHADCACHE*SHADCACHE*3 + (SHADCACHE&1)*SHADCACHE*4; |
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else /* spherical distribution */ |
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cachelen = SHADCACHE*SHADCACHE*6; |
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/* allocate cache */ |
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DCHECK(srcp->obscache != NULL, |
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CONSISTENCY, "initobscache() called twice"); |
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srcp->obscache = (OBSCACHE *)malloc(sizeof(OBSCACHE) + |
| 316 |
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sizeof(OBJECT)*(cachelen-1)); |
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if (srcp->obscache == NULL) |
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error(SYSTEM, "out of memory in initobscache()"); |
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/* set parameters */ |
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if (srcp->sflags & SDISTANT) { |
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int ax, ax1, ax2; |
| 322 |
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RREAL amax = 0; |
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for (ax1 = 3; ax1--; ) |
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if (ABS(srcp->sloc[ax1]) > amax) { |
| 325 |
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amax = ABS(srcp->sloc[ax1]); |
| 326 |
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ax = ax1; |
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} |
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srcp->obscache->p.d.ax = ax; |
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ax1 = (ax+1)%3; |
| 330 |
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ax2 = (ax+2)%3; |
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VCOPY(srcp->obscache->p.d.o, thescene.cuorg); |
| 332 |
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if (srcp->sloc[ax] > 0) |
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srcp->obscache->p.d.o[ax] += thescene.cusize; |
| 334 |
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if (srcp->sloc[ax1] < 0) |
| 335 |
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srcp->obscache->p.d.o[ax1] += thescene.cusize * |
| 336 |
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srcp->sloc[ax1] / ABS(srcp->sloc[ax]); |
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if (srcp->sloc[ax2] < 0) |
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srcp->obscache->p.d.o[ax2] += thescene.cusize * |
| 339 |
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srcp->sloc[ax2] / ABS(srcp->sloc[ax]); |
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srcp->obscache->p.d.e1 = (1.-FTINY) / (thescene.cusize*(1. + |
| 341 |
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fabs(srcp->sloc[ax1]/srcp->sloc[ax]))); |
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srcp->obscache->p.d.e2 = (1.-FTINY) / (thescene.cusize*(1. + |
| 343 |
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fabs(srcp->sloc[ax2]/srcp->sloc[ax]))); |
| 344 |
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} else if (srcp->sflags & SFLAT) { |
| 345 |
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VCOPY(srcp->obscache->p.f.u, srcp->ss[SU]); |
| 346 |
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normalize(srcp->obscache->p.f.u); |
| 347 |
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fcross(srcp->obscache->p.f.v, |
| 348 |
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srcp->snorm, srcp->obscache->p.f.u); |
| 349 |
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} |
| 350 |
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/* XXX Should cast rays from source */ |
| 351 |
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for (i = cachelen; i--; ) |
| 352 |
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srcp->obscache->obs[i] = OVOID; |
| 353 |
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} |
| 354 |
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|
| 355 |
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|
| 356 |
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static OBJECT * /* return occluder cache entry */ |
| 357 |
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srcobstructp(register RAY *r) |
| 358 |
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{ |
| 359 |
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static OBJECT noobs; |
| 360 |
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SRCREC *srcp; |
| 361 |
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int ondx; |
| 362 |
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|
| 363 |
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DCHECK(r->rsrc < 0, CONSISTENCY, |
| 364 |
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"srcobstructp() called with unaimed ray"); |
| 365 |
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noobs = OVOID; |
| 366 |
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srcp = &source[r->rsrc]; |
| 367 |
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if (srcp->obscache == NULL) /* initialize cache */ |
| 368 |
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initobscache(srcp); |
| 369 |
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/* compute cache index */ |
| 370 |
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if (srcp->sflags & SDISTANT) { |
| 371 |
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int ax, ax1, ax2; |
| 372 |
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double t; |
| 373 |
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ax = srcp->obscache->p.d.ax; |
| 374 |
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if ((ax1 = ax+1) >= 3) ax1 -= 3; |
| 375 |
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if ((ax2 = ax+2) >= 3) ax2 -= 3; |
| 376 |
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t = (srcp->obscache->p.d.o[ax] - r->rorg[ax]) / srcp->sloc[ax]; |
| 377 |
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if (t <= FTINY) |
| 378 |
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return &noobs; /* could happen if ray is outside */ |
| 379 |
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ondx = 2*SHADCACHE*(int)(2*SHADCACHE*srcp->obscache->p.d.e1 * |
| 380 |
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(r->rorg[ax1] + t*srcp->sloc[ax1] - |
| 381 |
– |
srcp->obscache->p.d.o[ax1])); |
| 382 |
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ondx += (int)(2*SHADCACHE*srcp->obscache->p.d.e2 * |
| 383 |
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(r->rorg[ax2] + t*srcp->sloc[ax2] - |
| 384 |
– |
srcp->obscache->p.d.o[ax2])); |
| 385 |
– |
if (ondx < 0 | ondx >= 4*SHADCACHE*SHADCACHE) |
| 386 |
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return &nobs; /* could happen if ray is outside */ |
| 387 |
– |
} else if (srcp->sflags & SFLAT) { |
| 388 |
– |
FVECT sd; |
| 389 |
– |
RREAL sd0m, sd1m; |
| 390 |
– |
sd[0] = -DOT(r->rdir, srcp->obscache->p.f.u); |
| 391 |
– |
sd[1] = -DOT(r->rdir, srcp->obscache->p.f.v); |
| 392 |
– |
sd[2] = -DOT(r->rdir, srcp->snorm); |
| 393 |
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if (sd[2] < 0) |
| 394 |
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return &noobs; /* shouldn't happen */ |
| 395 |
– |
sd0m = ABS(sd[0]); |
| 396 |
– |
sd1m = ABS(sd[1]); |
| 397 |
– |
if (sd[2] >= sd0m && sd[2] >= sd1m) { |
| 398 |
– |
ondx = SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 399 |
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(1. + sd[0]/sd[2])); |
| 400 |
– |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 401 |
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(1. + sd[1]/sd[2])); |
| 402 |
– |
} else if (sd0m >= sd1m) { |
| 403 |
– |
ondx = SHADCACHE*SHADCACHE; |
| 404 |
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if (sd[0] < 0) |
| 405 |
– |
ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
| 406 |
– |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 407 |
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sd[2]/sd0m); |
| 408 |
– |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 409 |
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(1. + sd[1]/sd0m)); |
| 410 |
– |
} else /* sd1m > sd0m */ { |
| 411 |
– |
ondx = SHADCACHE*SHADCACHE + |
| 412 |
– |
((SHADCACHE+1)>>1)*SHADCACHE*2; |
| 413 |
– |
if (sd[1] < 0) |
| 414 |
– |
ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
| 415 |
– |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 416 |
– |
sd[2]/sd1m); |
| 417 |
– |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 418 |
– |
(1. + sd[0]/sd1m)); |
| 419 |
– |
} |
| 420 |
– |
} else /* spherical distribution */ { |
| 421 |
– |
int ax, ax1, ax2; |
| 422 |
– |
RREAL amax = 0; |
| 423 |
– |
for (ax1 = 3; ax1--; ) |
| 424 |
– |
if (ABS(r->rdir[ax1]) > amax) { |
| 425 |
– |
amax = ABS(r->rdir[ax1]); |
| 426 |
– |
ax = ax1; |
| 427 |
– |
} |
| 428 |
– |
if ((ax1 = ax+1) >= 3) ax1 -= 3; |
| 429 |
– |
if ((ax2 = ax+2) >= 3) ax2 -= 3; |
| 430 |
– |
ondx = 2*SHADCACHE*SHADCACHE * ax; |
| 431 |
– |
if (r->rdir[ax] < 0) |
| 432 |
– |
ondx += SHADCACHE*SHADCACHE; |
| 433 |
– |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 434 |
– |
(1. + r->rdir[ax1]/amax)); |
| 435 |
– |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 436 |
– |
(1. + r->rdir[ax2]/amax)); |
| 437 |
– |
} |
| 438 |
– |
/* return cache pointer */ |
| 439 |
– |
return(&srcp->obscache->obs[ondx]); |
| 440 |
– |
} |
| 441 |
– |
|
| 442 |
– |
|
| 443 |
– |
void /* free obstruction cache */ |
| 444 |
– |
freeobscache(SRCREC *srcp) |
| 445 |
– |
{ |
| 446 |
– |
if (srcp->obscache == NULL) |
| 447 |
– |
return; |
| 448 |
– |
free((void *)srcp->obscache); |
| 449 |
– |
srcp->obscache = NULL; |
| 450 |
– |
} |
| 451 |
– |
|
| 452 |
– |
|
| 453 |
– |
void /* record a source blocker */ |
| 454 |
– |
srcblocker(register RAY *r) |
| 455 |
– |
{ |
| 456 |
– |
OBJREC *m; |
| 457 |
– |
|
| 458 |
– |
if (r->robj == OVOID || objptr(r->robj) != r->ro || |
| 459 |
– |
isvolume(r->ro->otype)) |
| 460 |
– |
return; /* don't record complex blockers */ |
| 461 |
– |
m = findmaterial(r->ro); |
| 462 |
– |
if (m == NULL) |
| 463 |
– |
return; /* no material?! */ |
| 464 |
– |
if (!(ofun[m->otype].flags & T_OPAQUE)) |
| 465 |
– |
return; /* material not a reliable blocker */ |
| 466 |
– |
|
| 467 |
– |
*srcobstructp(r) = r->robj; /* else record obstructor */ |
| 468 |
– |
} |
| 469 |
– |
|
| 470 |
– |
|
| 471 |
– |
int /* check ray against cached blocker */ |
| 472 |
– |
srcblocked(RAY *r) |
| 473 |
– |
{ |
| 474 |
– |
OBJECT obs = *srcobstructp(r); |
| 475 |
– |
OBJREC *op; |
| 476 |
– |
|
| 477 |
– |
if (obs == OVOID) |
| 478 |
– |
return(0); |
| 479 |
– |
op = objptr(obs); /* check for intersection */ |
| 480 |
– |
return ((*ofun[op->otype].funp)(op, r)); |
| 481 |
– |
} |
| 482 |
– |
|
| 483 |
– |
#endif |
| 291 |
|
|
| 292 |
|
|
| 293 |
|
static int |
