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* External symbols declared in source.h |
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*/ |
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#include "copyright.h" |
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#include "ray.h" |
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#include "otypes.h" |
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#include "otspecial.h" |
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#include "source.h" |
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#include "random.h" |
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} |
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#if SHADCACHE /* preemptive shadow checking */ |
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#define ABS(x) ((x)>0 ? (x) : -(x)) |
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|
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static void /* find closest blockers to source */ |
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initobscache(SRCREC *srcp) |
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{ |
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int i; |
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int cachelen; |
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|
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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) + |
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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; |
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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) { |
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amax = ABS(srcp->sloc[ax1]); |
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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; |
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ax2 = (ax+2)%3; |
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VCOPY(srcp->obscache->p.d.o, thescene.cuorg); |
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if (srcp->sloc[ax] > 0) |
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srcp->obscache->p.d.o[ax] += thescene.cusize; |
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if (srcp->sloc[ax1] < 0) |
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srcp->obscache->p.d.o[ax1] += thescene.cusize * |
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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 * |
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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. + |
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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. + |
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fabs(srcp->sloc[ax2]/srcp->sloc[ax]))); |
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} else if (srcp->sflags & SFLAT) { |
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VCOPY(srcp->obscache->p.f.u, srcp->ss[SU]); |
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normalize(srcp->obscache->p.f.u); |
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fcross(srcp->obscache->p.f.v, |
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srcp->snorm, srcp->obscache->p.f.u); |
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} |
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/* XXX Should cast rays from source */ |
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for (i = cachelen; i--; ) |
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srcp->obscache->obs[i] = OVOID; |
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} |
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|
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|
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static OBJECT * /* return occluder cache entry */ |
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srcobstructp(register RAY *r) |
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{ |
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static OBJECT noobs; |
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SRCREC *srcp; |
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int ondx; |
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|
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DCHECK(r->rsrc < 0, CONSISTENCY, |
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"srcobstructp() called with unaimed ray"); |
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noobs = OVOID; |
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srcp = &source[r->rsrc]; |
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if (srcp->obscache == NULL) /* initialize cache */ |
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initobscache(srcp); |
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/* compute cache index */ |
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if (srcp->sflags & SDISTANT) { |
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int ax, ax1, ax2; |
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double t; |
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ax = srcp->obscache->p.d.ax; |
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if ((ax1 = ax+1) >= 3) ax1 -= 3; |
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if ((ax2 = ax+2) >= 3) ax2 -= 3; |
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t = (srcp->obscache->p.d.o[ax] - r->rorg[ax]) / srcp->sloc[ax]; |
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if (t <= FTINY) |
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return &noobs; /* could happen if ray is outside */ |
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ondx = 2*SHADCACHE*(int)(2*SHADCACHE*srcp->obscache->p.d.e1 * |
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(r->rorg[ax1] + t*srcp->sloc[ax1] - |
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srcp->obscache->p.d.o[ax1])); |
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ondx += (int)(2*SHADCACHE*srcp->obscache->p.d.e2 * |
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(r->rorg[ax2] + t*srcp->sloc[ax2] - |
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srcp->obscache->p.d.o[ax2])); |
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} else if (srcp->sflags & SFLAT) { |
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FVECT sd; |
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RREAL sd0m, sd1m; |
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sd[0] = -DOT(r->rdir, srcp->obscache->p.f.u); |
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sd[1] = -DOT(r->rdir, srcp->obscache->p.f.v); |
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sd[2] = -DOT(r->rdir, srcp->snorm); |
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if (sd[2] < 0) |
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return &noobs; /* shouldn't happen */ |
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sd0m = ABS(sd[0]); |
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sd1m = ABS(sd[1]); |
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if (sd[2] >= sd0m && sd[2] >= sd1m) { |
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ondx = SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
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(1. + sd[0]/sd[2])); |
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ondx += (int)(SHADCACHE*(.5-FTINY) * |
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(1. + sd[1]/sd[2])); |
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} else if (sd0m >= sd1m) { |
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ondx = SHADCACHE*SHADCACHE; |
402 |
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if (sd[0] < 0) |
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ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
404 |
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ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
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sd[2]/sd0m); |
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ondx += (int)(SHADCACHE*(.5-FTINY) * |
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(1. + sd[1]/sd0m)); |
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} else /* sd1m > sd0m */ { |
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ondx = SHADCACHE*SHADCACHE + |
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((SHADCACHE+1)>>1)*SHADCACHE*2; |
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if (sd[1] < 0) |
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ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
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ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
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sd[2]/sd1m); |
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ondx += (int)(SHADCACHE*(.5-FTINY) * |
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(1. + sd[0]/sd1m)); |
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} |
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} else /* spherical distribution */ { |
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int ax, ax1, ax2; |
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RREAL amax = 0; |
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for (ax1 = 3; ax1--; ) |
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if (ABS(r->rdir[ax1]) > amax) { |
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amax = ABS(r->rdir[ax1]); |
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ax = ax1; |
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} |
426 |
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if ((ax1 = ax+1) >= 3) ax1 -= 3; |
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if ((ax2 = ax+2) >= 3) ax2 -= 3; |
428 |
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ondx = 2*SHADCACHE*SHADCACHE * ax; |
429 |
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if (r->rdir[ax] < 0) |
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ondx += SHADCACHE*SHADCACHE; |
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ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
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(1. + r->rdir[ax1]/amax)); |
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ondx += (int)(SHADCACHE*(.5-FTINY) * |
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(1. + r->rdir[ax2]/amax)); |
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} |
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/* return cache pointer */ |
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return(&srcp->obscache->obs[ondx]); |
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} |
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|
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|
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void /* free obstruction cache */ |
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freeobscache(SRCREC *srcp) |
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{ |
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if (srcp->obscache == NULL) |
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return; |
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free((void *)srcp->obscache); |
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srcp->obscache = NULL; |
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} |
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|
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|
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void /* record a source blocker */ |
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srcblocker(register RAY *r) |
453 |
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{ |
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OBJREC *m; |
455 |
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|
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if (r->robj == OVOID || objptr(r->robj) != r->ro || |
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isvolume(r->ro->otype)) |
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return; /* don't record complex blockers */ |
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m = findmaterial(r->ro); |
460 |
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if (m == NULL) |
461 |
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return; /* no material?! */ |
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if (!(ofun[m->otype].flags & T_OPAQUE)) |
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return; /* material not a reliable blocker */ |
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|
465 |
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*srcobstructp(r) = r->robj; /* else record obstructor */ |
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} |
467 |
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|
468 |
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|
469 |
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int /* check ray against cached blocker */ |
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srcblocked(RAY *r) |
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{ |
472 |
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OBJECT obs = *srcobstructp(r); |
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OBJREC *op; |
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|
475 |
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if (obs == OVOID) |
476 |
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return(0); |
477 |
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op = objptr(obs); /* check for intersection */ |
478 |
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return ((*ofun[op->otype].funp)(op, r)); |
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} |
480 |
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|
481 |
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#endif |
482 |
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|
483 |
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|
293 |
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static int |
294 |
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cntcmp( /* contribution compare (descending) */ |
295 |
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const void *p1, |
415 |
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if (bright(sr.rcol) <= FTINY) { |
416 |
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#if SHADCACHE |
417 |
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if ((scp <= srccnt || scp[-1].sno != scp->sno) |
418 |
< |
&& (scp >= srccnt+ncnts || |
418 |
> |
&& (scp >= srccnt+ncnts-1 || |
419 |
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scp[1].sno != scp->sno)) |
420 |
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srcblocker(&sr); |
421 |
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#endif |