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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1995 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#include "otypes.h" |
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|
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#include "otspecial.h" |
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|
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#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
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|
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extern CUBE thescene; /* our scene */ |
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extern int maxdepth; /* maximum recursion depth */ |
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extern double minweight; /* minimum ray weight */ |
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extern int do_irrad; /* compute irradiance? */ |
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extern COLOR ambval; /* ambient value */ |
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|
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long nrays = 0L; /* number of rays traced */ |
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extern COLOR cextinction; /* global extinction coefficient */ |
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extern double salbedo; /* global scattering albedo */ |
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extern double seccg; /* global scattering eccentricity */ |
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extern double ssampdist; /* scatter sampling distance */ |
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|
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unsigned long raynum = 0; /* next unique ray number */ |
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unsigned long nrays = 0; /* number of calls to localhit */ |
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|
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static FLOAT Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
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OBJREC Lamb = { |
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OVOID, MAT_PLASTIC, "Lambertian", |
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{0, 5, NULL, Lambfa}, NULL, |
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}; /* a Lambertian surface */ |
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|
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OBJREC Aftplane; /* aft clipping plane object */ |
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|
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static int raymove(), checkset(), checkhit(); |
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|
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#define MAXLOOP 128 /* modifier loop detection */ |
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|
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#define RAYHIT (-1) /* return value for intercepted ray */ |
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r->crtype = r->rtype = rt; |
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r->rsrc = -1; |
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r->clipset = NULL; |
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r->revf = raytrace; |
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copycolor(r->cext, cextinction); |
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r->albedo = salbedo; |
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r->gecc = seccg; |
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r->slights = NULL; |
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} else { /* spawned ray */ |
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r->rlvl = ro->rlvl; |
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if (rt & RAYREFL) { |
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r->rlvl++; |
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r->rsrc = -1; |
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r->clipset = ro->clipset; |
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r->rmax = 0.0; |
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} else { |
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r->rsrc = ro->rsrc; |
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r->clipset = ro->newcset; |
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r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
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} |
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r->revf = ro->revf; |
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copycolor(r->cext, ro->cext); |
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r->albedo = ro->albedo; |
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r->gecc = ro->gecc; |
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r->slights = ro->slights; |
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r->rweight = ro->rweight * rw; |
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r->crtype = ro->crtype | (r->rtype = rt); |
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VCOPY(r->rorg, ro->rop); |
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} |
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r->rno = nrays; |
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rayclear(r); |
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return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
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} |
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|
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|
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rayclear(r) /* clear a ray for (re)evaluation */ |
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register RAY *r; |
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{ |
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r->rno = raynum++; |
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r->newcset = r->clipset; |
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r->ro = NULL; |
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r->rot = FHUGE; |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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setcolor(r->pcol, 1.0, 1.0, 1.0); |
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setcolor(r->rcol, 0.0, 0.0, 0.0); |
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return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
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r->rt = 0.0; |
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} |
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rayvalue(r) /* compute a ray's value */ |
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raytrace(r) /* trace a ray and compute its value */ |
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RAY *r; |
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{ |
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extern int (*trace)(); |
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|
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if (localhit(r, &thescene) || sourcehit(r)) |
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raycont(r); |
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if (localhit(r, &thescene)) |
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raycont(r); /* hit local surface, evaluate */ |
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else if (r->ro == &Aftplane) { |
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r->ro = NULL; /* hit aft clipping plane */ |
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r->rot = FHUGE; |
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} else if (sourcehit(r)) |
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rayshade(r, r->ro->omod); /* distant source */ |
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|
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rayparticipate(r); /* for participating medium */ |
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|
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if (trace != NULL) |
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(*trace)(r); /* trace execution */ |
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} |
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raycont(r) /* check for clipped object and continue */ |
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register RAY *r; |
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{ |
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if (r->clipset != NULL && inset(r->clipset, r->ro->omod)) |
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if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
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!rayshade(r, r->ro->omod)) |
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raytrans(r); |
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else |
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rayshade(r, r->ro->omod); |
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} |
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VCOPY(tr.rdir, r->rdir); |
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rayvalue(&tr); |
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copycolor(r->rcol, tr.rcol); |
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r->rt = r->rot + tr.rt; |
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} |
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} |
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int mod; |
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{ |
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static int depth = 0; |
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int gotmat; |
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register OBJREC *m; |
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/* check for infinite loop */ |
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if (depth++ >= MAXLOOP) |
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objerror(r->ro, USER, "possible modifier loop"); |
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for ( ; mod != OVOID; mod = m->omod) { |
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r->rt = r->rot; /* set effective ray length */ |
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for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) { |
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m = objptr(mod); |
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/****** unnecessary test since modifier() is always called |
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if (!ismodifier(m->otype)) { |
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error(USER, errmsg); |
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} |
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******/ |
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(*ofun[m->otype].funp)(m, r); /* execute function */ |
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m->lastrno = r->rno; |
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if (ismaterial(m->otype)) { /* materials call raytexture */ |
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depth--; |
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return; /* we're done */ |
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/* hack for irradiance calculation */ |
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if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS))) { |
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if (irr_ignore(m->otype)) { |
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depth--; |
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raytrans(r); |
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return(1); |
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} |
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if (!islight(m->otype)) |
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m = &Lamb; |
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} |
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/* materials call raytexture */ |
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gotmat = (*ofun[m->otype].funp)(m, r); |
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} |
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objerror(r->ro, USER, "material not found"); |
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depth--; |
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return(gotmat); |
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} |
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|
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|
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rayparticipate(r) /* compute ray medium participation */ |
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register RAY *r; |
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{ |
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COLOR ce, ca; |
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double dist; |
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double re, ge, be; |
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|
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if (intens(r->cext) <= 1./FHUGE) |
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return; /* no medium */ |
197 |
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if ((dist = r->rot) >= FHUGE) |
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dist = 2.*thescene.cusize; /* what to use for infinity? */ |
199 |
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if (r->crtype & SHADOW) |
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dist *= 1. - salbedo; /* no scattering for sources */ |
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if (dist <= FTINY) |
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return; /* no effective ray travel */ |
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re = dist*colval(r->cext,RED); |
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ge = dist*colval(r->cext,GRN); |
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be = dist*colval(r->cext,BLU); |
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setcolor(ce, re>92. ? 0. : exp(-re), |
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ge>92. ? 0. : exp(-ge), |
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be>92. ? 0. : exp(-be)); |
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multcolor(r->rcol, ce); /* path absorption */ |
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if (r->albedo <= FTINY || r->crtype & SHADOW) |
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return; /* no scattering */ |
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setcolor(ca, salbedo*colval(ambval,RED)*(1.-colval(ce,RED)), |
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salbedo*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
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salbedo*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
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addcolor(r->rcol, ca); /* ambient in scattering */ |
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srcscatter(r); /* source in scattering */ |
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} |
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|
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|
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raytexture(r, mod) /* get material modifiers */ |
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RAY *r; |
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int mod; |
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/* execute textures and patterns */ |
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for ( ; mod != OVOID; mod = m->omod) { |
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m = objptr(mod); |
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if (!istexture(m->otype)) { |
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/****** unnecessary test since modifier() is always called |
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if (!ismodifier(m->otype)) { |
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sprintf(errmsg, "illegal modifier \"%s\"", m->oname); |
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error(USER, errmsg); |
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} |
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(*ofun[m->otype].funp)(m, r); |
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m->lastrno = r->rno; |
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******/ |
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if ((*ofun[m->otype].funp)(m, r)) { |
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sprintf(errmsg, "conflicting material \"%s\"", |
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m->oname); |
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objerror(r->ro, USER, errmsg); |
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} |
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} |
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depth--; /* end here */ |
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} |
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OBJECT fore, back; |
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double coef; |
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{ |
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FVECT curpert, forepert, backpert; |
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COLOR curpcol, forepcol, backpcol; |
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RAY fr, br; |
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int foremat, backmat; |
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register int i; |
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/* clip coefficient */ |
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/* bound coefficient */ |
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if (coef > 1.0) |
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coef = 1.0; |
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else if (coef < 0.0) |
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coef = 0.0; |
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/* save current mods */ |
262 |
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VCOPY(curpert, r->pert); |
263 |
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copycolor(curpcol, r->pcol); |
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/* compute new mods */ |
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< |
/* foreground */ |
266 |
< |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
267 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
268 |
< |
if (fore != OVOID && coef > FTINY) |
269 |
< |
raytexture(r, fore); |
270 |
< |
VCOPY(forepert, r->pert); |
271 |
< |
copycolor(forepcol, r->pcol); |
272 |
< |
/* background */ |
273 |
< |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
274 |
< |
setcolor(r->pcol, 1.0, 1.0, 1.0); |
275 |
< |
if (back != OVOID && coef < 1.0-FTINY) |
276 |
< |
raytexture(r, back); |
277 |
< |
VCOPY(backpert, r->pert); |
183 |
< |
copycolor(backpcol, r->pcol); |
184 |
< |
/* sum perturbations */ |
261 |
> |
/* compute foreground and background */ |
262 |
> |
foremat = backmat = 0; |
263 |
> |
/* foreground */ |
264 |
> |
copystruct(&fr, r); |
265 |
> |
if (coef > FTINY) |
266 |
> |
foremat = rayshade(&fr, fore); |
267 |
> |
/* background */ |
268 |
> |
copystruct(&br, r); |
269 |
> |
if (coef < 1.0-FTINY) |
270 |
> |
backmat = rayshade(&br, back); |
271 |
> |
/* check for transparency */ |
272 |
> |
if (backmat ^ foremat) |
273 |
> |
if (backmat) |
274 |
> |
raytrans(&fr); |
275 |
> |
else |
276 |
> |
raytrans(&br); |
277 |
> |
/* mix perturbations */ |
278 |
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for (i = 0; i < 3; i++) |
279 |
< |
r->pert[i] = curpert[i] + coef*forepert[i] + |
280 |
< |
(1.0-coef)*backpert[i]; |
281 |
< |
/* multiply colors */ |
282 |
< |
setcolor(r->pcol, coef*colval(forepcol,RED) + |
283 |
< |
(1.0-coef)*colval(backpcol,RED), |
284 |
< |
coef*colval(forepcol,GRN) + |
285 |
< |
(1.0-coef)*colval(backpcol,GRN), |
286 |
< |
coef*colval(forepcol,BLU) + |
287 |
< |
(1.0-coef)*colval(backpcol,BLU)); |
288 |
< |
multcolor(r->pcol, curpcol); |
279 |
> |
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
280 |
> |
/* mix pattern colors */ |
281 |
> |
scalecolor(fr.pcol, coef); |
282 |
> |
scalecolor(br.pcol, 1.0-coef); |
283 |
> |
copycolor(r->pcol, fr.pcol); |
284 |
> |
addcolor(r->pcol, br.pcol); |
285 |
> |
/* return value tells if material */ |
286 |
> |
if (!foremat & !backmat) |
287 |
> |
return(0); |
288 |
> |
/* mix returned ray values */ |
289 |
> |
scalecolor(fr.rcol, coef); |
290 |
> |
scalecolor(br.rcol, 1.0-coef); |
291 |
> |
copycolor(r->rcol, fr.rcol); |
292 |
> |
addcolor(r->rcol, br.rcol); |
293 |
> |
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
294 |
> |
return(1); |
295 |
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} |
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|
297 |
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|
298 |
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double |
299 |
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raydist(r, flags) /* compute (cumulative) ray distance */ |
300 |
+ |
register RAY *r; |
301 |
+ |
register int flags; |
302 |
+ |
{ |
303 |
+ |
double sum = 0.0; |
304 |
+ |
|
305 |
+ |
while (r != NULL && r->crtype&flags) { |
306 |
+ |
sum += r->rot; |
307 |
+ |
r = r->parent; |
308 |
+ |
} |
309 |
+ |
return(sum); |
310 |
+ |
} |
311 |
+ |
|
312 |
+ |
|
313 |
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double |
314 |
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raynormal(norm, r) /* compute perturbed normal for ray */ |
315 |
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FVECT norm; |
316 |
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register RAY *r; |
324 |
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* still fraught with problems since reflected rays and similar |
325 |
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* directions calculated from the surface normal may spawn rays behind |
326 |
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* the surface. The only solution is to curb textures at high |
327 |
< |
* incidence (Rdot << 1). |
327 |
> |
* incidence (namely, keep DOT(rdir,pert) < Rdot). |
328 |
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*/ |
329 |
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|
330 |
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for (i = 0; i < 3; i++) |
345 |
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} |
346 |
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|
347 |
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|
348 |
+ |
newrayxf(r) /* get new tranformation matrix for ray */ |
349 |
+ |
RAY *r; |
350 |
+ |
{ |
351 |
+ |
static struct xfn { |
352 |
+ |
struct xfn *next; |
353 |
+ |
FULLXF xf; |
354 |
+ |
} xfseed = { &xfseed }, *xflast = &xfseed; |
355 |
+ |
register struct xfn *xp; |
356 |
+ |
register RAY *rp; |
357 |
+ |
|
358 |
+ |
/* |
359 |
+ |
* Search for transform in circular list that |
360 |
+ |
* has no associated ray in the tree. |
361 |
+ |
*/ |
362 |
+ |
xp = xflast; |
363 |
+ |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
364 |
+ |
if (rp->rox == &xp->xf) { /* xp in use */ |
365 |
+ |
xp = xp->next; /* move to next */ |
366 |
+ |
if (xp == xflast) { /* need new one */ |
367 |
+ |
xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
368 |
+ |
if (xp == NULL) |
369 |
+ |
error(SYSTEM, |
370 |
+ |
"out of memory in newrayxf"); |
371 |
+ |
/* insert in list */ |
372 |
+ |
xp->next = xflast->next; |
373 |
+ |
xflast->next = xp; |
374 |
+ |
break; /* we're done */ |
375 |
+ |
} |
376 |
+ |
rp = r; /* start check over */ |
377 |
+ |
} |
378 |
+ |
/* got it */ |
379 |
+ |
r->rox = &xp->xf; |
380 |
+ |
xflast = xp; |
381 |
+ |
} |
382 |
+ |
|
383 |
+ |
|
384 |
|
flipsurface(r) /* reverse surface orientation */ |
385 |
|
register RAY *r; |
386 |
|
{ |
398 |
|
register RAY *r; |
399 |
|
register CUBE *scene; |
400 |
|
{ |
401 |
+ |
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
402 |
|
FVECT curpos; /* current cube position */ |
403 |
< |
int mpos, mneg; /* sign flags */ |
403 |
> |
int sflags; /* sign flags */ |
404 |
|
double t, dt; |
405 |
|
register int i; |
406 |
|
|
407 |
|
nrays++; /* increment trace counter */ |
408 |
< |
|
258 |
< |
mpos = mneg = 0; |
408 |
> |
sflags = 0; |
409 |
|
for (i = 0; i < 3; i++) { |
410 |
|
curpos[i] = r->rorg[i]; |
411 |
< |
if (r->rdir[i] > FTINY) |
412 |
< |
mpos |= 1 << i; |
413 |
< |
else if (r->rdir[i] < -FTINY) |
414 |
< |
mneg |= 1 << i; |
411 |
> |
if (r->rdir[i] > 1e-7) |
412 |
> |
sflags |= 1 << i; |
413 |
> |
else if (r->rdir[i] < -1e-7) |
414 |
> |
sflags |= 0x10 << i; |
415 |
|
} |
416 |
+ |
if (sflags == 0) |
417 |
+ |
error(CONSISTENCY, "zero ray direction in localhit"); |
418 |
+ |
/* start off assuming nothing hit */ |
419 |
+ |
if (r->rmax > FTINY) { /* except aft plane if one */ |
420 |
+ |
r->ro = &Aftplane; |
421 |
+ |
r->rot = r->rmax; |
422 |
+ |
for (i = 0; i < 3; i++) |
423 |
+ |
r->rop[i] = r->rorg[i] + r->rot*r->rdir[i]; |
424 |
+ |
} |
425 |
+ |
/* find global cube entrance point */ |
426 |
|
t = 0.0; |
427 |
|
if (!incube(scene, curpos)) { |
428 |
|
/* find distance to entry */ |
429 |
|
for (i = 0; i < 3; i++) { |
430 |
|
/* plane in our direction */ |
431 |
< |
if (mpos & 1<<i) |
431 |
> |
if (sflags & 1<<i) |
432 |
|
dt = scene->cuorg[i]; |
433 |
< |
else if (mneg & 1<<i) |
433 |
> |
else if (sflags & 0x10<<i) |
434 |
|
dt = scene->cuorg[i] + scene->cusize; |
435 |
|
else |
436 |
|
continue; |
440 |
|
t = dt; /* farthest face is the one */ |
441 |
|
} |
442 |
|
t += FTINY; /* fudge to get inside cube */ |
443 |
+ |
if (t >= r->rot) /* clipped already */ |
444 |
+ |
return(0); |
445 |
|
/* advance position */ |
446 |
|
for (i = 0; i < 3; i++) |
447 |
|
curpos[i] += r->rdir[i]*t; |
449 |
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
450 |
|
return(0); |
451 |
|
} |
452 |
< |
return(raymove(curpos, mpos, mneg, r, scene) == RAYHIT); |
452 |
> |
cxset[0] = 0; |
453 |
> |
raymove(curpos, cxset, sflags, r, scene); |
454 |
> |
return(r->ro != NULL & r->ro != &Aftplane); |
455 |
|
} |
456 |
|
|
457 |
|
|
458 |
|
static int |
459 |
< |
raymove(pos, plus, minus, r, cu) /* check for hit as we move */ |
460 |
< |
FVECT pos; /* modified */ |
461 |
< |
int plus, minus; /* direction indicators to speed tests */ |
459 |
> |
raymove(pos, cxs, dirf, r, cu) /* check for hit as we move */ |
460 |
> |
FVECT pos; /* current position, modified herein */ |
461 |
> |
OBJECT *cxs; /* checked objects, modified by checkhit */ |
462 |
> |
int dirf; /* direction indicators to speed tests */ |
463 |
|
register RAY *r; |
464 |
|
register CUBE *cu; |
465 |
|
{ |
466 |
|
int ax; |
467 |
|
double dt, t; |
303 |
– |
register int sgn; |
468 |
|
|
469 |
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
470 |
|
CUBE cukid; |
471 |
< |
register int br; |
471 |
> |
register int br, sgn; |
472 |
|
|
473 |
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
474 |
|
VCOPY(cukid.cuorg, cu->cuorg); |
487 |
|
} |
488 |
|
for ( ; ; ) { |
489 |
|
cukid.cutree = octkid(cu->cutree, br); |
490 |
< |
if ((ax = raymove(pos,plus,minus,r,&cukid)) == RAYHIT) |
490 |
> |
if ((ax = raymove(pos,cxs,dirf,r,&cukid)) == RAYHIT) |
491 |
|
return(RAYHIT); |
492 |
|
sgn = 1 << ax; |
493 |
< |
if (sgn & minus) /* negative axis? */ |
330 |
< |
if (sgn & br) { |
331 |
< |
cukid.cuorg[ax] -= cukid.cusize; |
332 |
< |
br &= ~sgn; |
333 |
< |
} else |
334 |
< |
return(ax); /* underflow */ |
335 |
< |
else |
493 |
> |
if (sgn & dirf) /* positive axis? */ |
494 |
|
if (sgn & br) |
495 |
|
return(ax); /* overflow */ |
496 |
|
else { |
497 |
|
cukid.cuorg[ax] += cukid.cusize; |
498 |
|
br |= sgn; |
499 |
|
} |
500 |
+ |
else |
501 |
+ |
if (sgn & br) { |
502 |
+ |
cukid.cuorg[ax] -= cukid.cusize; |
503 |
+ |
br &= ~sgn; |
504 |
+ |
} else |
505 |
+ |
return(ax); /* underflow */ |
506 |
|
} |
507 |
|
/*NOTREACHED*/ |
508 |
|
} |
509 |
< |
if (isfull(cu->cutree) && checkhit(r, cu)) |
509 |
> |
if (isfull(cu->cutree)) { |
510 |
> |
if (checkhit(r, cu, cxs)) |
511 |
> |
return(RAYHIT); |
512 |
> |
} else if (r->ro == &Aftplane && incube(cu, r->rop)) |
513 |
|
return(RAYHIT); |
514 |
|
/* advance to next cube */ |
515 |
< |
sgn = plus | minus; |
516 |
< |
if (sgn&1) { |
350 |
< |
dt = plus&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
515 |
> |
if (dirf&0x11) { |
516 |
> |
dt = dirf&1 ? cu->cuorg[0] + cu->cusize : cu->cuorg[0]; |
517 |
|
t = (dt - pos[0])/r->rdir[0]; |
518 |
|
ax = 0; |
519 |
|
} else |
520 |
|
t = FHUGE; |
521 |
< |
if (sgn&2) { |
522 |
< |
dt = plus&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
521 |
> |
if (dirf&0x22) { |
522 |
> |
dt = dirf&2 ? cu->cuorg[1] + cu->cusize : cu->cuorg[1]; |
523 |
|
dt = (dt - pos[1])/r->rdir[1]; |
524 |
|
if (dt < t) { |
525 |
|
t = dt; |
526 |
|
ax = 1; |
527 |
|
} |
528 |
|
} |
529 |
< |
if (sgn&4) { |
530 |
< |
dt = plus&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
529 |
> |
if (dirf&0x44) { |
530 |
> |
dt = dirf&4 ? cu->cuorg[2] + cu->cusize : cu->cuorg[2]; |
531 |
|
dt = (dt - pos[2])/r->rdir[2]; |
532 |
|
if (dt < t) { |
533 |
|
t = dt; |
542 |
|
|
543 |
|
|
544 |
|
static |
545 |
< |
checkhit(r, cu) /* check for hit in full cube */ |
545 |
> |
checkhit(r, cu, cxs) /* check for hit in full cube */ |
546 |
|
register RAY *r; |
547 |
|
CUBE *cu; |
548 |
+ |
OBJECT *cxs; |
549 |
|
{ |
550 |
|
OBJECT oset[MAXSET+1]; |
551 |
|
register OBJREC *o; |
552 |
|
register int i; |
553 |
|
|
554 |
|
objset(oset, cu->cutree); |
555 |
+ |
checkset(oset, cxs); /* eliminate double-checking */ |
556 |
|
for (i = oset[0]; i > 0; i--) { |
557 |
|
o = objptr(oset[i]); |
390 |
– |
if (o->lastrno == r->rno) /* checked already? */ |
391 |
– |
continue; |
558 |
|
(*ofun[o->otype].funp)(o, r); |
393 |
– |
o->lastrno = r->rno; |
559 |
|
} |
560 |
|
if (r->ro == NULL) |
561 |
|
return(0); /* no scores yet */ |
562 |
|
|
563 |
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
564 |
+ |
} |
565 |
+ |
|
566 |
+ |
|
567 |
+ |
static |
568 |
+ |
checkset(os, cs) /* modify checked set and set to check */ |
569 |
+ |
register OBJECT *os; /* os' = os - cs */ |
570 |
+ |
register OBJECT *cs; /* cs' = cs + os */ |
571 |
+ |
{ |
572 |
+ |
OBJECT cset[MAXCSET+MAXSET+1]; |
573 |
+ |
register int i, j; |
574 |
+ |
int k; |
575 |
+ |
/* copy os in place, cset <- cs */ |
576 |
+ |
cset[0] = 0; |
577 |
+ |
k = 0; |
578 |
+ |
for (i = j = 1; i <= os[0]; i++) { |
579 |
+ |
while (j <= cs[0] && cs[j] < os[i]) |
580 |
+ |
cset[++cset[0]] = cs[j++]; |
581 |
+ |
if (j > cs[0] || os[i] != cs[j]) { /* object to check */ |
582 |
+ |
os[++k] = os[i]; |
583 |
+ |
cset[++cset[0]] = os[i]; |
584 |
+ |
} |
585 |
+ |
} |
586 |
+ |
if (!(os[0] = k)) /* new "to check" set size */ |
587 |
+ |
return; /* special case */ |
588 |
+ |
while (j <= cs[0]) /* get the rest of cs */ |
589 |
+ |
cset[++cset[0]] = cs[j++]; |
590 |
+ |
if (cset[0] > MAXCSET) /* truncate "checked" set if nec. */ |
591 |
+ |
cset[0] = MAXCSET; |
592 |
+ |
/* setcopy(cs, cset); */ /* copy cset back to cs */ |
593 |
+ |
os = cset; |
594 |
+ |
for (i = os[0]; i-- >= 0; ) |
595 |
+ |
*cs++ = *os++; |
596 |
|
} |