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#include "otspecial.h" |
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#include "rtotypes.h" |
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#include "source.h" |
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#if SHADCACHE /* preemptive shadow checking */ |
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|
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#ifndef MAX2SHADE |
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#define MAX2SHADE 200 /* limit # of sources to precheck */ |
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#endif |
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|
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#define ABS(x) ((x)>0 ? (x) : -(x)) |
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< |
#if SHADCACHE /* preemptive shadow checking */ |
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OBJECT * antimodlist = NULL; /* set of clipped materials */ |
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static void /* cast source ray to first blocker */ |
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static int /* cast source ray to first blocker */ |
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castshadow(int sn, FVECT rorg, FVECT rdir) |
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{ |
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RAY rt; |
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VCOPY(rt.rorg, rorg); |
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VCOPY(rt.rdir, rdir); |
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rt.rmax = 0; |
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rayorigin(&rt, NULL, PRIMARY, 1.0); |
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if (!localhit(&rt, &thescene)) |
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return; |
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/* pretend we were aimed at source */ |
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rt.crtype |= rt.rtype = SHADOW; |
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rt.rdir[0] = -rt.rdir[0]; |
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rt.rdir[1] = -rt.rdir[1]; |
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rt.rdir[2] = -rt.rdir[2]; |
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rt.rod = -rt.rod; |
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VSUB(rt.rorg, rt.rop, rt.rdir); |
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rt.rot = 1.; |
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rt.rsrc = sn; |
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rayorigin(&rt, PRIMARY, NULL, NULL); |
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/* check for intersection */ |
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while (localhit(&rt, &thescene)) { |
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RAY rt1 = rt; /* pretend we were aimed at source */ |
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rt1.crtype |= rt1.rtype = RSHADOW; |
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rt1.rdir[0] = -rt.rdir[0]; |
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rt1.rdir[1] = -rt.rdir[1]; |
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rt1.rdir[2] = -rt.rdir[2]; |
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rt1.rod = -rt.rod; |
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VSUB(rt1.rorg, rt.rop, rt.rdir); |
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rt1.rot = 1.; |
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rt1.rsrc = sn; |
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/* record blocker */ |
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srcblocker(&rt); |
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if (srcblocker(&rt1)) |
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return(1); |
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/* move past failed blocker */ |
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VSUM(rt.rorg, rt.rop, rt.rdir, 10.*FTINY); |
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rayclear(&rt); /* & try again... */ |
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} |
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return(0); /* found no blockers */ |
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} |
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static void /* initialize occlusion cache */ |
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void /* initialize occlusion cache */ |
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initobscache(int sn) |
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{ |
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register SRCREC *srcp = &source[sn]; |
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int cachelen; |
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FVECT rorg, rdir; |
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RREAL d; |
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int i, j, k; |
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int ax, ax1, ax2; |
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SRCREC *srcp = &source[sn]; |
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int cachelen; |
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FVECT rorg, rdir; |
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RREAL d; |
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int i, j, k; |
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int ax=0, ax1=1, ax2=2; |
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if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) |
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return; /* don't cache these */ |
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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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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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/* clear cache */ |
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for (i = cachelen; i--; ) |
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srcp->obscache->obs[i] = OVOID; |
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#if (MAX2SHADE >= 0) |
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if (sn >= MAX2SHADE) /* limit on prechecking */ |
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return; |
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#endif |
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/* cast shadow rays */ |
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if (srcp->sflags & SDISTANT) { |
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for (k = 3; k--; ) |
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static OBJECT * /* return occluder cache entry */ |
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srcobstructp(register RAY *r) |
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srcobstructp(RAY *r) |
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{ |
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static RNUMBER lastrno = ~0; |
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static OBJECT noobs; |
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static OBJECT *lastobjp; |
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SRCREC *srcp; |
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int ondx; |
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noobs = OVOID; |
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if (r->rno == lastrno) |
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return lastobjp; /* just recall last pointer */ |
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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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lastrno = r->rno; |
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lastobjp = &noobs; |
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srcp = &source[r->rsrc]; |
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if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) |
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return(&noobs); /* don't cache these */ |
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initobscache(r->rsrc); |
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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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int ax=0, ax1=1, ax2=2; |
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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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ondx += (int)(SHADCACHE*(.5-FTINY) * |
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(1. + sd[0]/sd1m)); |
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} |
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DCHECK(ondx < 0 | ondx >= SHADCACHE*SHADCACHE*3 + |
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(SHADCACHE&1)*SHADCACHE*4, CONSISTENCY, |
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DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*3 + |
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(SHADCACHE&1)*SHADCACHE*4), CONSISTENCY, |
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"flat source cache index out of bounds"); |
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} else /* spherical distribution */ { |
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int ax, ax1, ax2; |
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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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DCHECK(ondx < 0 | ondx >= SHADCACHE*SHADCACHE*6, CONSISTENCY, |
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DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*6), CONSISTENCY, |
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"radial source cache index out of bounds"); |
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} |
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/* return cache pointer */ |
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< |
return(&srcp->obscache->obs[ondx]); |
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> |
return(lastobjp = &srcp->obscache->obs[ondx]); |
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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) |
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int /* record a source blocker */ |
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srcblocker(RAY *r) |
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{ |
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OBJREC *m; |
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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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> |
return(0); /* don't record complex blockers */ |
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if (r->rsrc < 0 || source[r->rsrc].so == r->ro) |
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return(0); /* just a mistake, that's all */ |
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if (antimodlist != NULL && inset(antimodlist, r->ro->omod)) |
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return(0); /* could be clipped */ |
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m = findmaterial(r->ro); |
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if (m == NULL) |
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return; /* no material?! */ |
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if (!isopaque(m->otype)) |
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return; /* material not a reliable blocker */ |
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> |
return(0); /* no material?! */ |
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if (!isopaque(m)) |
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return(0); /* material not a reliable blocker */ |
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*srcobstructp(r) = r->robj; /* else record obstructor */ |
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return(1); |
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} |
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if (obs == OVOID) |
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return(0); |
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op = objptr(obs); /* check for intersection */ |
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return((*ofun[op->otype].funp)(op, r)); |
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> |
op = objptr(obs); /* check blocker intersection */ |
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> |
if (!(*ofun[op->otype].funp)(op, r)) |
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> |
return(0); |
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if (source[r->rsrc].sflags & SDISTANT) |
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return(1); |
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op = source[r->rsrc].so; /* check source intersection */ |
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if (!(*ofun[op->otype].funp)(op, r)) |
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return(1); |
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rayclear(r); |
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return(0); /* source in front */ |
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} |
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|
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|
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> |
void /* record potentially clipped materials */ |
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> |
markclip(OBJREC *m) |
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{ |
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> |
OBJECT *set2add, *oldset; |
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> |
|
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> |
if (m == NULL) { /* starting over */ |
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> |
if (antimodlist != NULL) |
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free((void *)antimodlist); |
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> |
antimodlist = NULL; |
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> |
return; |
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> |
} |
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> |
m_clip(m, NULL); /* initialize modifier list */ |
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> |
if ((set2add = (OBJECT *)m->os) == NULL || !set2add[0]) |
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return; |
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> |
|
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> |
if (antimodlist == NULL) { /* start of list */ |
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antimodlist = setsave(set2add); |
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> |
return; |
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> |
} |
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> |
/* else add to previous list */ |
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> |
oldset = antimodlist; |
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> |
antimodlist = (OBJECT *)malloc((oldset[0]+set2add[0]+1)*sizeof(OBJECT)); |
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> |
if (antimodlist == NULL) |
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> |
error(SYSTEM, "out of memory in markclip"); |
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> |
setunion(antimodlist, oldset, set2add); |
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> |
free((void *)oldset); |
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> |
} |
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> |
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> |
|
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> |
#else /* SHADCACHE */ |
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> |
|
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> |
|
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> |
void /* no-op also avoids linker warning */ |
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> |
markclip(OBJREC *m) |
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> |
{ |
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> |
(void)m; |
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} |
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