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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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/* maximum allowed angle difference (deg.) */ |
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#ifndef MAXANG |
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#define MAXANG 20. |
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#define MAXANG 20 |
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#endif |
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#if MAXANG>0 |
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#define MAXDIFF2 ( MAXANG*MAXANG * (PI*PI/180./180.)) |
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#endif |
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|
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#define MAXDIFF2 (long)( MAXANG*MAXANG /90./90.*(1L<<15)*(1L<<15)) |
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#define abs(i) ((i) < 0 ? -(i) : (i)) |
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RTREE qtrunk; /* our quadtree trunk */ |
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int qtMinNodesiz = 2; /* minimum node dimension (pixels) */ |
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struct rleaves qtL; /* our pile of leaves */ |
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int rayqleft = 0; /* rays left to queue before flush */ |
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|
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static int4 falleaves; /* our list of fallen leaves */ |
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|
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#define composted(li) (qtL.bl <= qtL.tl ? \ |
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((li) < qtL.bl || (li) >= qtL.tl) : \ |
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((li) < qtL.bl && (li) >= qtL.tl)) |
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|
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#define TBUNDLESIZ 409 /* number of twigs in a bundle */ |
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static RTREE **twigbundle; /* free twig blocks (NULL term.) */ |
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static int nexttwig; /* next free twig */ |
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#define ungetleaf(li) (qtL.tl=(li)) /* dangerous if used improperly */ |
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static RTREE * |
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newtwig() /* allocate a twig */ |
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{ |
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} |
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static int |
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newleaf() /* allocate a leaf from our pile */ |
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{ |
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int li; |
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|
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li = qtL.tl++; |
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if (qtL.tl >= qtL.nl) /* get next leaf in ring */ |
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qtL.tl = 0; |
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if (qtL.tl == qtL.bl) /* need to shake some free */ |
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qtCompost(LFREEPCT); |
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return(li); |
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} |
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|
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#define LEAFSIZ (3*sizeof(float)+2*sizeof(short)+\ |
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#define LEAFSIZ (3*sizeof(float)+sizeof(int4)+\ |
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sizeof(TMbright)+6*sizeof(BYTE)) |
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int |
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return(0); |
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/* assign larger alignment types earlier */ |
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qtL.wp = (float (*)[3])qtL.base; |
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qtL.wd = (short (*)[2])(qtL.wp + n); |
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qtL.wd = (int4 *)(qtL.wp + n); |
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qtL.brt = (TMbright *)(qtL.wd + n); |
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qtL.chr = (BYTE (*)[3])(qtL.brt + n); |
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qtL.rgb = (BYTE (*)[3])(qtL.chr + n); |
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qtL.nl = n; |
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qtL.tml = qtL.bl = qtL.tl = 0; |
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falleaves = -1; |
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return(n); |
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} |
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tp->flgs &= ~BRF(i); |
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} else if (tp->flgs & LFF(i)) { |
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li = tp->k[i].li; |
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if (qtL.bl < qtL.tl ? |
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(li < qtL.bl || li >= qtL.tl) : |
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(li < qtL.bl && li >= qtL.tl)) |
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if (composted(li)) |
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tp->flgs &= ~LFF(i); |
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} |
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} |
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qtCompost(pct) /* free up some leaves */ |
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int pct; |
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{ |
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register int4 *fl; |
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int nused, nclear, nmapped; |
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/* figure out how many leaves to clear */ |
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nclear = qtL.nl * pct / 100; |
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nused = qtL.tl - qtL.bl; |
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if (nclear >= nused) { /* clear them all */ |
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qtFreeTree(0); |
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qtL.tml = qtL.bl = qtL.tl = 0; |
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falleaves = -1; |
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return(nused); |
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} |
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/* else clear leaves from bottom */ |
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qtL.bl += nclear; |
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if (qtL.bl >= qtL.nl) qtL.bl -= qtL.nl; |
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if (nmapped <= nclear) qtL.tml = qtL.bl; |
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shaketree(&qtrunk); |
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shaketree(&qtrunk); /* dereference composted leaves */ |
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for (fl = &falleaves; *fl >= 0; fl = qtL.wd + *fl) |
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while (composted(*fl)) |
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if ((*fl = qtL.wd[*fl]) < 0) |
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return(nclear); |
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return(nclear); |
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} |
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static |
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encodedir(pa, dv) /* encode a normalized direction vector */ |
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short pa[2]; |
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FVECT dv; |
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{ |
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pa[1] = 0; |
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if (dv[2] >= 1.) |
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pa[0] = (1L<<15)-1; |
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else if (dv[2] <= -1.) |
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pa[0] = -((1L<<15)-1); |
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else { |
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pa[0] = ((1L<<15)-1)/(PI/2.) * asin(dv[2]); |
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pa[1] = ((1L<<15)-1)/PI * atan2(dv[1], dv[0]); |
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} |
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} |
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|
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#define ALTSHFT 5 |
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#define NALT (1<<ALTSHFT) |
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#define azisft(alt) azisftab[abs(alt)>>(15-ALTSHFT)] |
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|
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static unsigned short azisftab[NALT]; |
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static |
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azisftinit(alt) /* initialize azimuth scale factor table */ |
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int alt; |
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{ |
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register int i; |
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|
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for (i = NALT; i--; ) |
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azisftab[i] = 2.*(1L<<15) * cos(PI/2.*(i+.5)/NALT); |
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return(azisft(alt)); |
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} |
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|
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#define azisf(alt) (azisftab[0] ? azisft(alt) : azisftinit(alt)) >> 15 |
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|
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static long |
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dir2diff(pa1, pa2) /* relative distance^2 between directions */ |
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short pa1[2], pa2[2]; |
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{ |
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long altd2, azid2; |
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int alt; |
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|
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altd2 = pa1[0] - pa2[0]; /* get altitude difference^2 */ |
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altd2 *= altd2; |
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if (altd2 > MAXDIFF2) |
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return(altd2); /* too large already */ |
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azid2 = pa1[1] - pa2[1]; /* get adjusted azimuth difference^2 */ |
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if (azid2 < 0) azid2 = -azid2; |
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if (azid2 >= 1L<<15) { /* wrap sphere */ |
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azid2 -= 1L<<16; |
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if (azid2 < 0) azid2 = -azid2; |
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} |
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alt = (pa1[0]+pa2[0])/2; |
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azid2 = azid2*azisf(alt); /* evaluation order is important */ |
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azid2 *= azid2; |
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return(altd2 + azid2); |
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} |
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|
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int |
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qtFindLeaf(x, y) /* find closest leaf to (x,y) */ |
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int x, y; |
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static |
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addleaf(li) /* add a leaf to our tree */ |
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int li; |
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putleaf(li, drop) /* put a leaf in our tree */ |
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register int li; |
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int drop; |
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{ |
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register RTREE *tp = &qtrunk; |
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int x0=0, y0=0, x1=odev.hres, y1=odev.vres; |
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int lo = -1; |
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long d2; |
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short dc[2]; |
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register int lo = -1; |
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double d2; |
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int x, y, mx, my; |
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double z; |
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FVECT ip, wp; |
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FVECT ip, wp, vd; |
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register int q; |
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/* check for dead leaf */ |
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if (!qtL.chr[li][1] && !(qtL.chr[li][0] | qtL.chr[li][2])) |
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return(0); |
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/* compute leaf location in view */ |
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VCOPY(wp, qtL.wp[li]); |
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viewloc(ip, &odev.v, wp); |
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if (ip[2] <= 0. || ip[0] < 0. || ip[0] >= 1. |
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|| ip[1] < 0. || ip[1] >= 1.) |
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return(0); /* behind or outside view */ |
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goto dropit; /* behind or outside view */ |
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#ifdef DEBUG |
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if (odev.v.type == VT_PAR | odev.v.vfore > FTINY) |
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error(INTERNAL, "bad view assumption in addleaf"); |
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error(INTERNAL, "bad view assumption in putleaf"); |
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#endif |
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for (q = 0; q < 3; q++) |
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wp[q] = (wp[q] - odev.v.vp[q])/ip[2]; |
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encodedir(dc, wp); /* compute pixel direction */ |
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d2 = dir2diff(dc, qtL.wd[li]); |
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vd[q] = (wp[q] - odev.v.vp[q])/ip[2]; |
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d2 = fdir2diff(qtL.wd[li], vd); |
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#ifdef MAXDIFF2 |
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if (d2 > MAXDIFF2) |
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return(0); /* leaf dir. too far off */ |
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goto dropit; /* leaf dir. too far off */ |
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#endif |
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x = ip[0] * odev.hres; |
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y = ip[1] * odev.vres; |
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z = ip[2]; |
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if (!(tp->flgs & LFF(q))) { /* found stem for leaf */ |
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tp->k[q].li = li; |
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tp->flgs |= CHLFF(q); |
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break; |
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return(1); |
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} |
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if (lo != tp->k[q].li) { /* check old leaf */ |
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lo = tp->k[q].li; |
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/* is node minimum size? */ |
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if (y1-y0 <= qtMinNodesiz || x1-x0 <= qtMinNodesiz) { |
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if (z > (1.+qtDepthEps)*ip[2]) |
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return(0); /* old one closer */ |
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break; /* old one closer */ |
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if (z >= (1.-qtDepthEps)*ip[2] && |
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dir2diff(dc, qtL.wd[lo]) < d2) |
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return(0); /* old one better */ |
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tp->k[q].li = li; /* else new one is */ |
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fdir2diff(qtL.wd[lo], vd) < d2) |
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break; /* old one better */ |
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tp->k[q].li = li; /* attach new */ |
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tp->flgs |= CHF(q); |
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li = lo; /* drop old... */ |
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break; |
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} |
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tp->flgs &= ~LFF(q); /* else grow tree */ |
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my = ip[1] * odev.vres; |
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if (mx >= (x0 + x1) >> 1) q |= 01; |
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if (my >= (y0 + y1) >> 1) q |= 02; |
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tp->flgs = CH_ANY|LFF(q); /* all new */ |
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tp->k[q].li = lo; |
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tp->flgs |= LFF(q)|CH_ANY; /* all new */ |
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} |
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return(1); /* done */ |
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dropit: |
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if (drop) |
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if (li+1 == (qtL.tl ? qtL.tl : qtL.nl)) |
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qtL.tl = li; /* special case */ |
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else { |
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qtL.chr[li][0] = qtL.chr[li][1] = qtL.chr[li][2] = 0; |
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qtL.wd[li] = falleaves; |
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falleaves = li; |
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} |
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return(li == lo); |
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} |
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|
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dev_value(c, p, v) /* add a pixel value to our quadtree */ |
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dev_value(c, d, p) /* add a pixel value to our quadtree */ |
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COLR c; |
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FVECT p, v; |
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FVECT d, p; |
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{ |
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register int li; |
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|
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li = newleaf(); |
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VCOPY(qtL.wp[li], p); |
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encodedir(qtL.wd[li], v); |
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int mapit; |
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/* grab a leaf */ |
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if (!imm_mode && falleaves >= 0) { /* check for fallen leaves */ |
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li = falleaves; |
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falleaves = qtL.wd[li]; |
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mapit = qtL.tml <= qtL.tl ? |
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(li < qtL.tml || li >= qtL.tl) : |
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(li < qtL.tml && li >= qtL.tl) ; |
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} else { /* else allocate new one */ |
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li = qtL.tl++; |
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if (qtL.tl >= qtL.nl) /* next leaf in ring */ |
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qtL.tl = 0; |
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if (qtL.tl == qtL.bl) /* need to shake some free */ |
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qtCompost(LFREEPCT); |
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mapit = 0; /* we'll map it later */ |
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} |
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if (p == NULL) |
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> |
VSUM(qtL.wp[li], odev.v.vp, d, FHUGE); |
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else |
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VCOPY(qtL.wp[li], p); |
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qtL.wd[li] = encodedir(d); |
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tmCvColrs(&qtL.brt[li], qtL.chr[li], c, 1); |
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if (!addleaf(li)) |
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ungetleaf(li); |
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> |
if (putleaf(li, 1)) { |
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> |
if (mapit) |
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> |
tmMapPixels(qtL.rgb+li, qtL.brt+li, qtL.chr+li, 1); |
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> |
if (--rayqleft == 0) |
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> |
dev_flush(); /* flush output */ |
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> |
} |
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} |
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qtFreeTree(0); /* blow the old tree away */ |
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/* regrow it in new place */ |
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for (i = qtL.bl; i != qtL.tl; ) { |
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< |
addleaf(i); |
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> |
putleaf(i, 0); |
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if (++i >= qtL.nl) i = 0; |
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} |
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} |
