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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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|
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/* |
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* Quadtree driver support routines. |
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*/ |
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|
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#include "standard.h" |
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#include "rhd_qtree.h" |
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/* quantity of leaves to free at a time */ |
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#ifndef LFREEPCT |
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#define LFREEPCT 25 |
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#endif |
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|
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RTREE qtrunk; /* our quadtree trunk */ |
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double qtDepthEps = .02; /* epsilon to compare depths (z fraction) */ |
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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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|
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#define TBUNDLESIZ 409 /* number of twigs in a bundle */ |
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|
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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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|
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|
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static RTREE * |
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newtwig() /* allocate a twig */ |
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{ |
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register int bi; |
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|
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if (twigbundle == NULL) { /* initialize */ |
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twigbundle = (RTREE **)malloc(sizeof(RTREE *)); |
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if (twigbundle == NULL) |
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goto memerr; |
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twigbundle[0] = NULL; |
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} |
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bi = nexttwig / TBUNDLESIZ; |
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if (twigbundle[bi] == NULL) { /* new block */ |
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twigbundle = (RTREE **)realloc((char *)twigbundle, |
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(bi+2)*sizeof(RTREE *)); |
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if (twigbundle == NULL) |
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goto memerr; |
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twigbundle[bi] = (RTREE *)calloc(TBUNDLESIZ, sizeof(RTREE)); |
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if (twigbundle[bi] == NULL) |
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goto memerr; |
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twigbundle[bi+1] = NULL; |
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} |
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/* nexttwig++ % TBUNDLESIZ */ |
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return(twigbundle[bi] + (nexttwig++ - bi*TBUNDLESIZ)); |
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memerr: |
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error(SYSTEM, "out of memory in newtwig"); |
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} |
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|
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|
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qtFreeTree(really) /* free allocated twigs */ |
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int really; |
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{ |
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register int i; |
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|
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qtrunk.flgs = CH_ANY; /* chop down tree */ |
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if (twigbundle == NULL) |
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return; |
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i = (TBUNDLESIZ-1+nexttwig)/TBUNDLESIZ; |
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nexttwig = 0; |
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if (!really) { /* just clear allocated blocks */ |
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while (i--) |
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bzero((char *)twigbundle[i], TBUNDLESIZ*sizeof(RTREE)); |
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return; |
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} |
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/* else "really" means free up memory */ |
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for (i = 0; twigbundle[i] != NULL; i++) |
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free((char *)twigbundle[i]); |
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free((char *)twigbundle); |
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twigbundle = NULL; |
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} |
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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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|
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#define LEAFSIZ (3*sizeof(float)+sizeof(TMbright)+6*sizeof(BYTE)) |
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|
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int |
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qtAllocLeaves(n) /* allocate space for n leaves */ |
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register int n; |
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{ |
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unsigned nbytes; |
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register unsigned i; |
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|
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qtFreeTree(0); /* make sure tree is empty */ |
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if (n <= 0) |
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return(0); |
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if (qtL.nl >= n) |
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return(qtL.nl); |
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else if (qtL.nl > 0) |
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free(qtL.base); |
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/* round space up to nearest power of 2 */ |
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nbytes = n*LEAFSIZ + 8; |
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for (i = 1024; nbytes > i; i <<= 1) |
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; |
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n = (i - 8) / LEAFSIZ; /* should we make sure n is even? */ |
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qtL.base = (char *)malloc(n*LEAFSIZ); |
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if (qtL.base == NULL) |
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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.brt = (TMbright *)(qtL.wp + 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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return(n); |
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} |
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|
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#undef LEAFSIZ |
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|
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|
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qtFreeLeaves() /* free our allocated leaves and twigs */ |
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{ |
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qtFreeTree(1); /* free tree also */ |
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if (qtL.nl <= 0) |
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return; |
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free(qtL.base); |
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qtL.base = NULL; |
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qtL.nl = 0; |
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} |
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|
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|
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static |
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shaketree(tp) /* shake dead leaves from tree */ |
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register RTREE *tp; |
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{ |
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register int i, li; |
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|
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for (i = 0; i < 4; i++) |
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if (tp->flgs & BRF(i)) { |
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shaketree(tp->k[i].b); |
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if (is_stump(tp->k[i].b)) |
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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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tp->flgs &= ~LFF(i); |
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} |
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} |
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|
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|
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int |
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qtCompost(pct) /* free up some leaves */ |
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int pct; |
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{ |
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int nused, nclear, nmapped; |
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|
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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 (nused <= 0) nused += qtL.nl; |
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nclear -= qtL.nl - nused; |
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if (nclear <= 0) |
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return(0); |
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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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return(nused); |
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} |
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/* else clear leaves from bottom */ |
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nmapped = qtL.tml - qtL.bl; |
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if (nmapped < 0) nmapped += qtL.nl; |
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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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return(nclear); |
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} |
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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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{ |
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register RTREE *tp = &qtrunk; |
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int li = -1; |
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int x0=0, y0=0, x1=odev.hres, y1=odev.vres; |
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int mx, my; |
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register int q; |
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/* check limits */ |
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if (x < 0 || x >= odev.hres || y < 0 || y >= odev.vres) |
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return(-1); |
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/* find nearby leaf in our tree */ |
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for ( ; ; ) { |
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for (q = 0; q < 4; q++) /* find any leaf this level */ |
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if (tp->flgs & LFF(q)) { |
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li = tp->k[q].li; |
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break; |
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} |
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q = 0; /* which quadrant are we? */ |
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mx = (x0 + x1) >> 1; |
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my = (y0 + y1) >> 1; |
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if (x < mx) x1 = mx; |
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else {x0 = mx; q |= 01;} |
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if (y < my) y1 = my; |
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else {y0 = my; q |= 02;} |
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if (tp->flgs & BRF(q)) { /* branch down if not a leaf */ |
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tp = tp->k[q].b; |
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continue; |
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} |
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if (tp->flgs & LFF(q)) /* good shot! */ |
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return(tp->k[q].li); |
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return(li); /* else return what we have */ |
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} |
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} |
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|
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|
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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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{ |
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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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int x, y, mx, my; |
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double z; |
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FVECT ip, wp; |
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register int q; |
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/* compute leaf location */ |
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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; |
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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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/* find the place for it */ |
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for ( ; ; ) { |
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q = 0; /* which quadrant? */ |
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mx = (x0 + x1) >> 1; |
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my = (y0 + y1) >> 1; |
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if (x < mx) x1 = mx; |
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else {x0 = mx; q |= 01;} |
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if (y < my) y1 = my; |
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else {y0 = my; q |= 02;} |
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if (tp->flgs & BRF(q)) { /* move to next branch */ |
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tp->flgs |= CHF(q); /* not sure; guess */ |
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tp = tp->k[q].b; |
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continue; |
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} |
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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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} |
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/* check existing leaf */ |
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if (lo != tp->k[q].li) { |
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lo = tp->k[q].li; |
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VCOPY(wp, qtL.wp[lo]); |
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viewloc(ip, &odev.v, wp); |
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} |
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/* is node minimum size? */ |
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if (x1-x0 <= qtMinNodesiz || y1-y0 <= qtMinNodesiz) { |
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if (z > (1.-qtDepthEps)*ip[2]) /* who is closer? */ |
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return; /* old one is */ |
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tp->k[q].li = li; /* new one is */ |
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tp->flgs |= CHF(q); |
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break; |
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} |
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tp->flgs &= ~LFF(q); /* else grow tree */ |
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tp->flgs |= CHBRF(q); |
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tp = tp->k[q].b = newtwig(); |
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q = 0; /* old leaf -> new branch */ |
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mx = ip[0] * odev.hres; |
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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->k[q].li = lo; |
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tp->flgs |= LFF(q)|CH_ANY; /* all new */ |
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} |
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} |
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|
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|
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dev_value(c, p) /* add a pixel value to our quadtree */ |
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COLR c; |
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FVECT 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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tmCvColrs(&qtL.brt[li], qtL.chr[li], c, 1); |
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addleaf(li); |
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} |
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|
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|
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qtReplant() /* replant our tree using new view */ |
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{ |
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register int i; |
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/* anything to replant? */ |
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if (qtL.bl == qtL.tl) |
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return; |
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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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if (++i >= qtL.nl) i = 0; |
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} |
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} |
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|
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|
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qtMapLeaves(redo) /* map our leaves to RGB */ |
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int redo; |
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{ |
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int aorg, alen, borg, blen; |
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/* recompute mapping? */ |
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if (redo) |
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qtL.tml = qtL.bl; |
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/* already done? */ |
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if (qtL.tml == qtL.tl) |
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return(1); |
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/* compute segments */ |
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aorg = qtL.tml; |
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if (qtL.tl >= aorg) { |
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alen = qtL.tl - aorg; |
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blen = 0; |
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} else { |
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alen = qtL.nl - aorg; |
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borg = 0; |
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blen = qtL.tl; |
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} |
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/* (re)compute tone mapping? */ |
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if (qtL.tml == qtL.bl) { |
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tmClearHisto(); |
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tmAddHisto(qtL.brt+aorg, alen, 1); |
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if (blen > 0) |
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tmAddHisto(qtL.brt+borg, blen, 1); |
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if (tmComputeMapping(0., 0., 0.) != TM_E_OK) |
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return(0); |
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} |
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if (tmMapPixels(qtL.rgb+aorg, qtL.brt+aorg, |
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qtL.chr+aorg, alen) != TM_E_OK) |
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return(0); |
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if (blen > 0) |
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tmMapPixels(qtL.rgb+borg, qtL.brt+borg, |
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qtL.chr+borg, blen); |
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qtL.tml = qtL.tl; |
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return(1); |
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} |
