| 1 |
/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ SGI"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* 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 (PI*PI/180./180.* MAXANG*MAXANG ) |
| 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.) */ |
| 34 |
static int nexttwig; /* next free twig */ |
| 35 |
|
| 36 |
#define ungetleaf(li) (qtL.tl=(li)) /* dangerous if used improperly */ |
| 37 |
|
| 38 |
|
| 39 |
static RTREE * |
| 40 |
newtwig() /* allocate a twig */ |
| 41 |
{ |
| 42 |
register int bi; |
| 43 |
|
| 44 |
if (twigbundle == NULL) { /* initialize */ |
| 45 |
twigbundle = (RTREE **)malloc(sizeof(RTREE *)); |
| 46 |
if (twigbundle == NULL) |
| 47 |
goto memerr; |
| 48 |
twigbundle[0] = NULL; |
| 49 |
} |
| 50 |
bi = nexttwig / TBUNDLESIZ; |
| 51 |
if (twigbundle[bi] == NULL) { /* new block */ |
| 52 |
twigbundle = (RTREE **)realloc((char *)twigbundle, |
| 53 |
(bi+2)*sizeof(RTREE *)); |
| 54 |
if (twigbundle == NULL) |
| 55 |
goto memerr; |
| 56 |
twigbundle[bi] = (RTREE *)calloc(TBUNDLESIZ, sizeof(RTREE)); |
| 57 |
if (twigbundle[bi] == NULL) |
| 58 |
goto memerr; |
| 59 |
twigbundle[bi+1] = NULL; |
| 60 |
} |
| 61 |
/* nexttwig++ % TBUNDLESIZ */ |
| 62 |
return(twigbundle[bi] + (nexttwig++ - bi*TBUNDLESIZ)); |
| 63 |
memerr: |
| 64 |
error(SYSTEM, "out of memory in newtwig"); |
| 65 |
} |
| 66 |
|
| 67 |
|
| 68 |
qtFreeTree(really) /* free allocated twigs */ |
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int really; |
| 70 |
{ |
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register int i; |
| 72 |
|
| 73 |
qtrunk.flgs = CH_ANY; /* chop down tree */ |
| 74 |
if (twigbundle == NULL) |
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return; |
| 76 |
i = (TBUNDLESIZ-1+nexttwig)/TBUNDLESIZ; |
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nexttwig = 0; |
| 78 |
if (!really) { /* just clear allocated blocks */ |
| 79 |
while (i--) |
| 80 |
bzero((char *)twigbundle[i], TBUNDLESIZ*sizeof(RTREE)); |
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return; |
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} |
| 83 |
/* else "really" means free up memory */ |
| 84 |
for (i = 0; twigbundle[i] != NULL; i++) |
| 85 |
free((char *)twigbundle[i]); |
| 86 |
free((char *)twigbundle); |
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twigbundle = NULL; |
| 88 |
} |
| 89 |
|
| 90 |
|
| 91 |
static int |
| 92 |
newleaf() /* allocate a leaf from our pile */ |
| 93 |
{ |
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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 */ |
| 98 |
qtL.tl = 0; |
| 99 |
if (qtL.tl == qtL.bl) /* need to shake some free */ |
| 100 |
qtCompost(LFREEPCT); |
| 101 |
return(li); |
| 102 |
} |
| 103 |
|
| 104 |
|
| 105 |
#define LEAFSIZ (3*sizeof(float)+sizeof(int4)+\ |
| 106 |
sizeof(TMbright)+6*sizeof(BYTE)) |
| 107 |
|
| 108 |
int |
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qtAllocLeaves(n) /* allocate space for n leaves */ |
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register int n; |
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{ |
| 112 |
unsigned nbytes; |
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register unsigned i; |
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|
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qtFreeTree(0); /* make sure tree is empty */ |
| 116 |
if (n <= 0) |
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return(0); |
| 118 |
if (qtL.nl >= n) |
| 119 |
return(qtL.nl); |
| 120 |
else if (qtL.nl > 0) |
| 121 |
free(qtL.base); |
| 122 |
/* round space up to nearest power of 2 */ |
| 123 |
nbytes = n*LEAFSIZ + 8; |
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for (i = 1024; nbytes > i; i <<= 1) |
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; |
| 126 |
n = (i - 8) / LEAFSIZ; /* should we make sure n is even? */ |
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qtL.base = (char *)malloc(n*LEAFSIZ); |
| 128 |
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 = (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); |
| 135 |
qtL.rgb = (BYTE (*)[3])(qtL.chr + n); |
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qtL.nl = n; |
| 137 |
qtL.tml = qtL.bl = qtL.tl = 0; |
| 138 |
return(n); |
| 139 |
} |
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|
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#undef LEAFSIZ |
| 142 |
|
| 143 |
|
| 144 |
qtFreeLeaves() /* free our allocated leaves and twigs */ |
| 145 |
{ |
| 146 |
qtFreeTree(1); /* free tree also */ |
| 147 |
if (qtL.nl <= 0) |
| 148 |
return; |
| 149 |
free(qtL.base); |
| 150 |
qtL.base = NULL; |
| 151 |
qtL.nl = 0; |
| 152 |
} |
| 153 |
|
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|
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static |
| 156 |
shaketree(tp) /* shake dead leaves from tree */ |
| 157 |
register RTREE *tp; |
| 158 |
{ |
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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); |
| 164 |
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; |
| 168 |
if (qtL.bl < qtL.tl ? |
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(li < qtL.bl || li >= qtL.tl) : |
| 170 |
(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; |
| 198 |
if (qtL.bl >= qtL.nl) qtL.bl -= qtL.nl; |
| 199 |
if (nmapped <= nclear) qtL.tml = qtL.bl; |
| 200 |
shaketree(&qtrunk); |
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return(nclear); |
| 202 |
} |
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|
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|
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#define DCSCALE 11585.2 /* (1<<13)*sqrt(2) */ |
| 206 |
#define FXNEG 01 |
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#define FYNEG 02 |
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#define FZNEG 04 |
| 209 |
#define FXACT 010 |
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#define FZACT 020 |
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#define F1SFT 5 |
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#define F2SFT 18 |
| 213 |
#define FMASK 0x1fff |
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|
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static int4 |
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encodedir(dv) /* encode a normalized direction vector */ |
| 217 |
FVECT dv; |
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{ |
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register int4 dc = 0; |
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int cd[3], cm; |
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register int i; |
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|
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for (i = 0; i < 3; i++) |
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if (dv[i] < 0.) { |
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cd[i] = dv[i] * -DCSCALE; |
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dc |= 1<<i; |
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} else |
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cd[i] = dv[i] * DCSCALE; |
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if (cd[0] <= cd[1]) { |
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dc |= FXACT | cd[0] << F1SFT; |
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cm = cd[1]; |
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} else { |
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dc |= cd[1] << F1SFT; |
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cm = cd[0]; |
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} |
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if (cd[2] <= cm) |
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dc |= FZACT | cd[2] << F2SFT; |
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else |
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dc |= cm << F2SFT; |
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return(dc); |
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} |
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|
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|
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static |
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decodedir(dv, dc) /* decode a normalized direction vector */ |
| 246 |
FVECT dv; /* returned */ |
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register int4 dc; |
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{ |
| 249 |
double d1, d2, der; |
| 250 |
|
| 251 |
d1 = ((dc>>F1SFT & FMASK)+.5)/DCSCALE; |
| 252 |
d2 = ((dc>>F2SFT & FMASK)+.5)/DCSCALE; |
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der = sqrt(1. - d1*d1 - d2*d2); |
| 254 |
if (dc & FXACT) { |
| 255 |
dv[0] = d1; |
| 256 |
if (dc & FZACT) { dv[1] = der; dv[2] = d2; } |
| 257 |
else { dv[1] = d2; dv[2] = der; } |
| 258 |
} else { |
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dv[1] = d1; |
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if (dc & FZACT) { dv[0] = der; dv[2] = d2; } |
| 261 |
else { dv[0] = d2; dv[2] = der; } |
| 262 |
} |
| 263 |
if (dc & FXNEG) dv[0] = -dv[0]; |
| 264 |
if (dc & FYNEG) dv[1] = -dv[1]; |
| 265 |
if (dc & FZNEG) dv[2] = -dv[2]; |
| 266 |
} |
| 267 |
|
| 268 |
|
| 269 |
static double |
| 270 |
dir2diff(dc1, dc2) /* relative radians^2 between directions */ |
| 271 |
int4 dc1, dc2; |
| 272 |
{ |
| 273 |
FVECT v1, v2; |
| 274 |
|
| 275 |
decodedir(v1, dc1); |
| 276 |
decodedir(v2, dc2); |
| 277 |
|
| 278 |
return(2. - 2.*DOT(v1,v2)); |
| 279 |
} |
| 280 |
|
| 281 |
|
| 282 |
static double |
| 283 |
fdir2diff(dc1, v2) /* relative radians^2 between directions */ |
| 284 |
int4 dc1; |
| 285 |
register FVECT v2; |
| 286 |
{ |
| 287 |
FVECT v1; |
| 288 |
|
| 289 |
decodedir(v1, dc1); |
| 290 |
|
| 291 |
return(2. - 2.*DOT(v1,v2)); |
| 292 |
} |
| 293 |
|
| 294 |
|
| 295 |
int |
| 296 |
qtFindLeaf(x, y) /* find closest leaf to (x,y) */ |
| 297 |
int x, y; |
| 298 |
{ |
| 299 |
register RTREE *tp = &qtrunk; |
| 300 |
int li = -1; |
| 301 |
int x0=0, y0=0, x1=odev.hres, y1=odev.vres; |
| 302 |
int mx, my; |
| 303 |
register int q; |
| 304 |
/* check limits */ |
| 305 |
if (x < 0 || x >= odev.hres || y < 0 || y >= odev.vres) |
| 306 |
return(-1); |
| 307 |
/* find nearby leaf in our tree */ |
| 308 |
for ( ; ; ) { |
| 309 |
for (q = 0; q < 4; q++) /* find any leaf this level */ |
| 310 |
if (tp->flgs & LFF(q)) { |
| 311 |
li = tp->k[q].li; |
| 312 |
break; |
| 313 |
} |
| 314 |
q = 0; /* which quadrant are we? */ |
| 315 |
mx = (x0 + x1) >> 1; |
| 316 |
my = (y0 + y1) >> 1; |
| 317 |
if (x < mx) x1 = mx; |
| 318 |
else {x0 = mx; q |= 01;} |
| 319 |
if (y < my) y1 = my; |
| 320 |
else {y0 = my; q |= 02;} |
| 321 |
if (tp->flgs & BRF(q)) { /* branch down if not a leaf */ |
| 322 |
tp = tp->k[q].b; |
| 323 |
continue; |
| 324 |
} |
| 325 |
if (tp->flgs & LFF(q)) /* good shot! */ |
| 326 |
return(tp->k[q].li); |
| 327 |
return(li); /* else return what we have */ |
| 328 |
} |
| 329 |
} |
| 330 |
|
| 331 |
|
| 332 |
static |
| 333 |
addleaf(li) /* add a leaf to our tree */ |
| 334 |
int li; |
| 335 |
{ |
| 336 |
register RTREE *tp = &qtrunk; |
| 337 |
int x0=0, y0=0, x1=odev.hres, y1=odev.vres; |
| 338 |
int lo = -1; |
| 339 |
double d2; |
| 340 |
int x, y, mx, my; |
| 341 |
double z; |
| 342 |
FVECT ip, wp, vd; |
| 343 |
register int q; |
| 344 |
/* compute leaf location in view */ |
| 345 |
VCOPY(wp, qtL.wp[li]); |
| 346 |
viewloc(ip, &odev.v, wp); |
| 347 |
if (ip[2] <= 0. || ip[0] < 0. || ip[0] >= 1. |
| 348 |
|| ip[1] < 0. || ip[1] >= 1.) |
| 349 |
return(0); /* behind or outside view */ |
| 350 |
#ifdef DEBUG |
| 351 |
if (odev.v.type == VT_PAR | odev.v.vfore > FTINY) |
| 352 |
error(INTERNAL, "bad view assumption in addleaf"); |
| 353 |
#endif |
| 354 |
for (q = 0; q < 3; q++) |
| 355 |
vd[q] = (wp[q] - odev.v.vp[q])/ip[2]; |
| 356 |
d2 = fdir2diff(qtL.wd[li], vd); |
| 357 |
if (d2 > MAXDIFF2) |
| 358 |
return(0); /* leaf dir. too far off */ |
| 359 |
x = ip[0] * odev.hres; |
| 360 |
y = ip[1] * odev.vres; |
| 361 |
z = ip[2]; |
| 362 |
/* find the place for it */ |
| 363 |
for ( ; ; ) { |
| 364 |
q = 0; /* which quadrant? */ |
| 365 |
mx = (x0 + x1) >> 1; |
| 366 |
my = (y0 + y1) >> 1; |
| 367 |
if (x < mx) x1 = mx; |
| 368 |
else {x0 = mx; q |= 01;} |
| 369 |
if (y < my) y1 = my; |
| 370 |
else {y0 = my; q |= 02;} |
| 371 |
if (tp->flgs & BRF(q)) { /* move to next branch */ |
| 372 |
tp->flgs |= CHF(q); /* not sure; guess */ |
| 373 |
tp = tp->k[q].b; |
| 374 |
continue; |
| 375 |
} |
| 376 |
if (!(tp->flgs & LFF(q))) { /* found stem for leaf */ |
| 377 |
tp->k[q].li = li; |
| 378 |
tp->flgs |= CHLFF(q); |
| 379 |
break; |
| 380 |
} |
| 381 |
if (lo != tp->k[q].li) { /* check old leaf */ |
| 382 |
lo = tp->k[q].li; |
| 383 |
VCOPY(wp, qtL.wp[lo]); |
| 384 |
viewloc(ip, &odev.v, wp); |
| 385 |
} |
| 386 |
/* is node minimum size? */ |
| 387 |
if (y1-y0 <= qtMinNodesiz || x1-x0 <= qtMinNodesiz) { |
| 388 |
if (z > (1.+qtDepthEps)*ip[2]) |
| 389 |
return(0); /* old one closer */ |
| 390 |
if (z >= (1.-qtDepthEps)*ip[2] && |
| 391 |
fdir2diff(qtL.wd[lo], vd) < d2) |
| 392 |
return(0); /* old one better */ |
| 393 |
tp->k[q].li = li; /* else new one is */ |
| 394 |
tp->flgs |= CHF(q); |
| 395 |
break; |
| 396 |
} |
| 397 |
tp->flgs &= ~LFF(q); /* else grow tree */ |
| 398 |
tp->flgs |= CHBRF(q); |
| 399 |
tp = tp->k[q].b = newtwig(); |
| 400 |
q = 0; /* old leaf -> new branch */ |
| 401 |
mx = ip[0] * odev.hres; |
| 402 |
my = ip[1] * odev.vres; |
| 403 |
if (mx >= (x0 + x1) >> 1) q |= 01; |
| 404 |
if (my >= (y0 + y1) >> 1) q |= 02; |
| 405 |
tp->flgs = CH_ANY|LFF(q); /* all new */ |
| 406 |
tp->k[q].li = lo; |
| 407 |
} |
| 408 |
return(1); /* done */ |
| 409 |
} |
| 410 |
|
| 411 |
|
| 412 |
dev_value(c, p, v) /* add a pixel value to our quadtree */ |
| 413 |
COLR c; |
| 414 |
FVECT p, v; |
| 415 |
{ |
| 416 |
register int li; |
| 417 |
|
| 418 |
li = newleaf(); |
| 419 |
VCOPY(qtL.wp[li], p); |
| 420 |
qtL.wd[li] = encodedir(v); |
| 421 |
tmCvColrs(&qtL.brt[li], qtL.chr[li], c, 1); |
| 422 |
if (!addleaf(li)) |
| 423 |
ungetleaf(li); |
| 424 |
} |
| 425 |
|
| 426 |
|
| 427 |
qtReplant() /* replant our tree using new view */ |
| 428 |
{ |
| 429 |
register int i; |
| 430 |
/* anything to replant? */ |
| 431 |
if (qtL.bl == qtL.tl) |
| 432 |
return; |
| 433 |
qtFreeTree(0); /* blow the old tree away */ |
| 434 |
/* regrow it in new place */ |
| 435 |
for (i = qtL.bl; i != qtL.tl; ) { |
| 436 |
addleaf(i); |
| 437 |
if (++i >= qtL.nl) i = 0; |
| 438 |
} |
| 439 |
} |
| 440 |
|
| 441 |
|
| 442 |
qtMapLeaves(redo) /* map our leaves to RGB */ |
| 443 |
int redo; |
| 444 |
{ |
| 445 |
int aorg, alen, borg, blen; |
| 446 |
/* recompute mapping? */ |
| 447 |
if (redo) |
| 448 |
qtL.tml = qtL.bl; |
| 449 |
/* already done? */ |
| 450 |
if (qtL.tml == qtL.tl) |
| 451 |
return(1); |
| 452 |
/* compute segments */ |
| 453 |
aorg = qtL.tml; |
| 454 |
if (qtL.tl >= aorg) { |
| 455 |
alen = qtL.tl - aorg; |
| 456 |
blen = 0; |
| 457 |
} else { |
| 458 |
alen = qtL.nl - aorg; |
| 459 |
borg = 0; |
| 460 |
blen = qtL.tl; |
| 461 |
} |
| 462 |
/* (re)compute tone mapping? */ |
| 463 |
if (qtL.tml == qtL.bl) { |
| 464 |
tmClearHisto(); |
| 465 |
tmAddHisto(qtL.brt+aorg, alen, 1); |
| 466 |
if (blen > 0) |
| 467 |
tmAddHisto(qtL.brt+borg, blen, 1); |
| 468 |
if (tmComputeMapping(0., 0., 0.) != TM_E_OK) |
| 469 |
return(0); |
| 470 |
} |
| 471 |
if (tmMapPixels(qtL.rgb+aorg, qtL.brt+aorg, |
| 472 |
qtL.chr+aorg, alen) != TM_E_OK) |
| 473 |
return(0); |
| 474 |
if (blen > 0) |
| 475 |
tmMapPixels(qtL.rgb+borg, qtL.brt+borg, |
| 476 |
qtL.chr+borg, blen); |
| 477 |
qtL.tml = qtL.tl; |
| 478 |
return(1); |
| 479 |
} |
