| 1 |
/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
| 2 |
|
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#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ SGI"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
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* Quadtree driver support routines. |
| 9 |
*/ |
| 10 |
|
| 11 |
#include "standard.h" |
| 12 |
#include "rhd_qtree.h" |
| 13 |
/* quantity of leaves to free at a time */ |
| 14 |
#ifndef LFREEPCT |
| 15 |
#define LFREEPCT 25 |
| 16 |
#endif |
| 17 |
/* maximum allowed angle difference (deg.) */ |
| 18 |
#ifndef MAXANG |
| 19 |
#define MAXANG 20. |
| 20 |
#endif |
| 21 |
|
| 22 |
#define MAXDIFF2 (long)( MAXANG*MAXANG /90./90.*(1L<<15)*(1L<<15)) |
| 23 |
|
| 24 |
#define abs(i) ((i) < 0 ? -(i) : (i)) |
| 25 |
|
| 26 |
RTREE qtrunk; /* our quadtree trunk */ |
| 27 |
double qtDepthEps = .05; /* epsilon to compare depths (z fraction) */ |
| 28 |
int qtMinNodesiz = 2; /* minimum node dimension (pixels) */ |
| 29 |
struct rleaves qtL; /* our pile of leaves */ |
| 30 |
|
| 31 |
#define TBUNDLESIZ 409 /* number of twigs in a bundle */ |
| 32 |
|
| 33 |
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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#define ungetleaf(li) (qtL.tl=(li)) /* dangerous if used improperly */ |
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|
| 38 |
|
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static RTREE * |
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newtwig() /* allocate a twig */ |
| 41 |
{ |
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register int bi; |
| 43 |
|
| 44 |
if (twigbundle == NULL) { /* initialize */ |
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twigbundle = (RTREE **)malloc(sizeof(RTREE *)); |
| 46 |
if (twigbundle == NULL) |
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goto memerr; |
| 48 |
twigbundle[0] = NULL; |
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} |
| 50 |
bi = nexttwig / TBUNDLESIZ; |
| 51 |
if (twigbundle[bi] == NULL) { /* new block */ |
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twigbundle = (RTREE **)realloc((char *)twigbundle, |
| 53 |
(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)+2*sizeof(short)+\ |
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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.wd = (short (*)[2])(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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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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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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|
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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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|
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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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|
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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; |
| 274 |
/* check limits */ |
| 275 |
if (x < 0 || x >= odev.hres || y < 0 || y >= odev.vres) |
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return(-1); |
| 277 |
/* find nearby leaf in our tree */ |
| 278 |
for ( ; ; ) { |
| 279 |
for (q = 0; q < 4; q++) /* find any leaf this level */ |
| 280 |
if (tp->flgs & LFF(q)) { |
| 281 |
li = tp->k[q].li; |
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break; |
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} |
| 284 |
q = 0; /* which quadrant are we? */ |
| 285 |
mx = (x0 + x1) >> 1; |
| 286 |
my = (y0 + y1) >> 1; |
| 287 |
if (x < mx) x1 = mx; |
| 288 |
else {x0 = mx; q |= 01;} |
| 289 |
if (y < my) y1 = my; |
| 290 |
else {y0 = my; q |= 02;} |
| 291 |
if (tp->flgs & BRF(q)) { /* branch down if not a leaf */ |
| 292 |
tp = tp->k[q].b; |
| 293 |
continue; |
| 294 |
} |
| 295 |
if (tp->flgs & LFF(q)) /* good shot! */ |
| 296 |
return(tp->k[q].li); |
| 297 |
return(li); /* else return what we have */ |
| 298 |
} |
| 299 |
} |
| 300 |
|
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|
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static |
| 303 |
addleaf(li) /* add a leaf to our tree */ |
| 304 |
int li; |
| 305 |
{ |
| 306 |
register RTREE *tp = &qtrunk; |
| 307 |
int x0=0, y0=0, x1=odev.hres, y1=odev.vres; |
| 308 |
int lo = -1; |
| 309 |
long d2; |
| 310 |
short dc[2]; |
| 311 |
int x, y, mx, my; |
| 312 |
double z; |
| 313 |
FVECT ip, wp; |
| 314 |
register int q; |
| 315 |
/* compute leaf location in view */ |
| 316 |
VCOPY(wp, qtL.wp[li]); |
| 317 |
viewloc(ip, &odev.v, wp); |
| 318 |
if (ip[2] <= 0. || ip[0] < 0. || ip[0] >= 1. |
| 319 |
|| ip[1] < 0. || ip[1] >= 1.) |
| 320 |
return(0); /* behind or outside view */ |
| 321 |
#ifdef DEBUG |
| 322 |
if (odev.v.type == VT_PAR | odev.v.vfore > FTINY) |
| 323 |
error(INTERNAL, "bad view assumption in addleaf"); |
| 324 |
#endif |
| 325 |
for (q = 0; q < 3; q++) |
| 326 |
wp[q] = (wp[q] - odev.v.vp[q])/ip[2]; |
| 327 |
encodedir(dc, wp); /* compute pixel direction */ |
| 328 |
d2 = dir2diff(dc, qtL.wd[li]); |
| 329 |
if (d2 > MAXDIFF2) |
| 330 |
return(0); /* leaf dir. too far off */ |
| 331 |
x = ip[0] * odev.hres; |
| 332 |
y = ip[1] * odev.vres; |
| 333 |
z = ip[2]; |
| 334 |
/* find the place for it */ |
| 335 |
for ( ; ; ) { |
| 336 |
q = 0; /* which quadrant? */ |
| 337 |
mx = (x0 + x1) >> 1; |
| 338 |
my = (y0 + y1) >> 1; |
| 339 |
if (x < mx) x1 = mx; |
| 340 |
else {x0 = mx; q |= 01;} |
| 341 |
if (y < my) y1 = my; |
| 342 |
else {y0 = my; q |= 02;} |
| 343 |
if (tp->flgs & BRF(q)) { /* move to next branch */ |
| 344 |
tp->flgs |= CHF(q); /* not sure; guess */ |
| 345 |
tp = tp->k[q].b; |
| 346 |
continue; |
| 347 |
} |
| 348 |
if (!(tp->flgs & LFF(q))) { /* found stem for leaf */ |
| 349 |
tp->k[q].li = li; |
| 350 |
tp->flgs |= CHLFF(q); |
| 351 |
break; |
| 352 |
} |
| 353 |
if (lo != tp->k[q].li) { /* check old leaf */ |
| 354 |
lo = tp->k[q].li; |
| 355 |
VCOPY(wp, qtL.wp[lo]); |
| 356 |
viewloc(ip, &odev.v, wp); |
| 357 |
} |
| 358 |
/* is node minimum size? */ |
| 359 |
if (y1-y0 <= qtMinNodesiz || x1-x0 <= qtMinNodesiz) { |
| 360 |
if (z > (1.+qtDepthEps)*ip[2]) |
| 361 |
return(0); /* old one closer */ |
| 362 |
if (z >= (1.-qtDepthEps)*ip[2] && |
| 363 |
dir2diff(dc, qtL.wd[lo]) < d2) |
| 364 |
return(0); /* old one better */ |
| 365 |
tp->k[q].li = li; /* else new one is */ |
| 366 |
tp->flgs |= CHF(q); |
| 367 |
break; |
| 368 |
} |
| 369 |
tp->flgs &= ~LFF(q); /* else grow tree */ |
| 370 |
tp->flgs |= CHBRF(q); |
| 371 |
tp = tp->k[q].b = newtwig(); |
| 372 |
q = 0; /* old leaf -> new branch */ |
| 373 |
mx = ip[0] * odev.hres; |
| 374 |
my = ip[1] * odev.vres; |
| 375 |
if (mx >= (x0 + x1) >> 1) q |= 01; |
| 376 |
if (my >= (y0 + y1) >> 1) q |= 02; |
| 377 |
tp->k[q].li = lo; |
| 378 |
tp->flgs |= LFF(q)|CH_ANY; /* all new */ |
| 379 |
} |
| 380 |
return(1); /* done */ |
| 381 |
} |
| 382 |
|
| 383 |
|
| 384 |
dev_value(c, p, v) /* add a pixel value to our quadtree */ |
| 385 |
COLR c; |
| 386 |
FVECT p, v; |
| 387 |
{ |
| 388 |
register int li; |
| 389 |
|
| 390 |
li = newleaf(); |
| 391 |
VCOPY(qtL.wp[li], p); |
| 392 |
encodedir(qtL.wd[li], v); |
| 393 |
tmCvColrs(&qtL.brt[li], qtL.chr[li], c, 1); |
| 394 |
if (!addleaf(li)) |
| 395 |
ungetleaf(li); |
| 396 |
} |
| 397 |
|
| 398 |
|
| 399 |
qtReplant() /* replant our tree using new view */ |
| 400 |
{ |
| 401 |
register int i; |
| 402 |
/* anything to replant? */ |
| 403 |
if (qtL.bl == qtL.tl) |
| 404 |
return; |
| 405 |
qtFreeTree(0); /* blow the old tree away */ |
| 406 |
/* regrow it in new place */ |
| 407 |
for (i = qtL.bl; i != qtL.tl; ) { |
| 408 |
addleaf(i); |
| 409 |
if (++i >= qtL.nl) i = 0; |
| 410 |
} |
| 411 |
} |
| 412 |
|
| 413 |
|
| 414 |
qtMapLeaves(redo) /* map our leaves to RGB */ |
| 415 |
int redo; |
| 416 |
{ |
| 417 |
int aorg, alen, borg, blen; |
| 418 |
/* recompute mapping? */ |
| 419 |
if (redo) |
| 420 |
qtL.tml = qtL.bl; |
| 421 |
/* already done? */ |
| 422 |
if (qtL.tml == qtL.tl) |
| 423 |
return(1); |
| 424 |
/* compute segments */ |
| 425 |
aorg = qtL.tml; |
| 426 |
if (qtL.tl >= aorg) { |
| 427 |
alen = qtL.tl - aorg; |
| 428 |
blen = 0; |
| 429 |
} else { |
| 430 |
alen = qtL.nl - aorg; |
| 431 |
borg = 0; |
| 432 |
blen = qtL.tl; |
| 433 |
} |
| 434 |
/* (re)compute tone mapping? */ |
| 435 |
if (qtL.tml == qtL.bl) { |
| 436 |
tmClearHisto(); |
| 437 |
tmAddHisto(qtL.brt+aorg, alen, 1); |
| 438 |
if (blen > 0) |
| 439 |
tmAddHisto(qtL.brt+borg, blen, 1); |
| 440 |
if (tmComputeMapping(0., 0., 0.) != TM_E_OK) |
| 441 |
return(0); |
| 442 |
} |
| 443 |
if (tmMapPixels(qtL.rgb+aorg, qtL.brt+aorg, |
| 444 |
qtL.chr+aorg, alen) != TM_E_OK) |
| 445 |
return(0); |
| 446 |
if (blen > 0) |
| 447 |
tmMapPixels(qtL.rgb+borg, qtL.brt+borg, |
| 448 |
qtL.chr+borg, blen); |
| 449 |
qtL.tml = qtL.tl; |
| 450 |
return(1); |
| 451 |
} |
