| 1 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ SGI"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Quadtree-specific set operations. |
| 9 |
*/ |
| 10 |
|
| 11 |
#include "standard.h" |
| 12 |
|
| 13 |
#include "sm_qtree.h" |
| 14 |
|
| 15 |
|
| 16 |
#define QTSETIBLK 2048 /* set index allocation block size */ |
| 17 |
#define QTELEMBLK 8 /* set element allocation block */ |
| 18 |
|
| 19 |
#define QTNODESIZ(ne) ((ne) + QTELEMBLK - ((ne) % QTELEMBLK)) |
| 20 |
|
| 21 |
OBJECT **qtsettab= NULL; /* quadtree leaf node table */ |
| 22 |
QUADTREE qtnumsets; /* number of used set indices */ |
| 23 |
static int qtfreesets = EMPTY; /* free set index list */ |
| 24 |
|
| 25 |
|
| 26 |
QUADTREE |
| 27 |
qtnewleaf(oset) /* return new leaf node for object set */ |
| 28 |
OBJECT *oset; |
| 29 |
{ |
| 30 |
register QUADTREE osi; |
| 31 |
int nalc; |
| 32 |
|
| 33 |
if (*oset <= 0) |
| 34 |
return(EMPTY); /* should be error? */ |
| 35 |
if (qtfreesets != EMPTY) { |
| 36 |
osi = qtfreesets; |
| 37 |
qtfreesets = (int)qtsettab[osi]; |
| 38 |
} else if ((osi = qtnumsets++) % QTSETIBLK == 0) { |
| 39 |
qtsettab = (OBJECT **)realloc((char *)qtsettab, |
| 40 |
(unsigned)(osi+QTSETIBLK)*sizeof(OBJECT *)); |
| 41 |
if (qtsettab == NULL) |
| 42 |
goto memerr; |
| 43 |
} |
| 44 |
nalc = QTNODESIZ(*oset); |
| 45 |
if ((qtsettab[osi] = (OBJECT *)malloc(nalc*sizeof(OBJECT))) == NULL) |
| 46 |
goto memerr; |
| 47 |
setcopy(qtsettab[osi], oset); |
| 48 |
return(QT_INDEX(osi)); |
| 49 |
memerr: |
| 50 |
error(SYSTEM, "out of memory in qtnewleaf"); |
| 51 |
} |
| 52 |
|
| 53 |
|
| 54 |
QUADTREE |
| 55 |
qtdelelem(qt, id) /* delete element from leaf node, no quest. */ |
| 56 |
QUADTREE qt; |
| 57 |
OBJECT id; |
| 58 |
{ |
| 59 |
register QUADTREE lf; |
| 60 |
int oalc, nalc; |
| 61 |
|
| 62 |
#ifdef DEBUG |
| 63 |
if(id < 0) |
| 64 |
eputs("qtdelelem():Invalid triangle id\n"); |
| 65 |
if (!QT_IS_LEAF(qt) || (lf = QT_SET_INDEX(qt)) >= qtnumsets) |
| 66 |
error(CONSISTENCY, "empty/bad node in qtdelelem"); |
| 67 |
if (!inset(qtsettab[lf], id)) |
| 68 |
error(CONSISTENCY, "id not in leaf in qtdelelem"); |
| 69 |
#else |
| 70 |
lf = QT_SET_INDEX(qt); |
| 71 |
#endif |
| 72 |
if (qtsettab[lf][0] <= 1) { /* blow leaf away */ |
| 73 |
free((char *)qtsettab[lf]); |
| 74 |
qtsettab[lf] = (OBJECT *)qtfreesets; |
| 75 |
qtfreesets = lf; |
| 76 |
return(EMPTY); |
| 77 |
} /* else delete element */ |
| 78 |
oalc = QTNODESIZ(qtsettab[lf][0]); |
| 79 |
nalc = QTNODESIZ(qtsettab[lf][0] - 1); |
| 80 |
deletelem(qtsettab[lf], id); |
| 81 |
if (nalc != oalc) |
| 82 |
qtsettab[lf] = (OBJECT *)realloc((char *)qtsettab[lf], |
| 83 |
nalc*sizeof(OBJECT)); |
| 84 |
return(qt); |
| 85 |
} |
| 86 |
|
| 87 |
|
| 88 |
QUADTREE |
| 89 |
qtaddelem(qt, id) /* add element to leaf node, no quest. */ |
| 90 |
QUADTREE qt; |
| 91 |
OBJECT id; |
| 92 |
{ |
| 93 |
OBJECT newset[2]; |
| 94 |
register QUADTREE lf; |
| 95 |
int oalc, nalc; |
| 96 |
|
| 97 |
#ifdef DEBUG |
| 98 |
if(id < 0) |
| 99 |
eputs("qtaddelem():Invalid triangle id\n"); |
| 100 |
#endif |
| 101 |
if (QT_IS_EMPTY(qt)) { /* create new leaf */ |
| 102 |
newset[0] = 1; newset[1] = id; |
| 103 |
return(qtnewleaf(newset)); |
| 104 |
} /* else add element */ |
| 105 |
#ifdef DEBUG |
| 106 |
if (!QT_IS_LEAF(qt) || (lf = QT_SET_INDEX(qt)) >= qtnumsets) |
| 107 |
error(CONSISTENCY, "bad node in qtaddelem"); |
| 108 |
if (inset(qtsettab[lf], id)) |
| 109 |
error(CONSISTENCY, "id already in leaf in qtaddelem"); |
| 110 |
#else |
| 111 |
lf = QT_SET_INDEX(qt); |
| 112 |
#endif |
| 113 |
oalc = QTNODESIZ(qtsettab[lf][0]); |
| 114 |
nalc = QTNODESIZ(qtsettab[lf][0] + 1); |
| 115 |
if (nalc != oalc) { |
| 116 |
qtsettab[lf] = (OBJECT *)realloc((char *)qtsettab[lf], |
| 117 |
nalc*sizeof(OBJECT)); |
| 118 |
if (qtsettab[lf] == NULL) |
| 119 |
error(SYSTEM, "out of memory in qtaddelem"); |
| 120 |
} |
| 121 |
insertelem(qtsettab[lf], id); |
| 122 |
return(qt); |
| 123 |
} |
| 124 |
|
| 125 |
|
| 126 |
#ifdef DEBUG |
| 127 |
OBJECT * |
| 128 |
qtqueryset(qt) /* return object set for leaf node */ |
| 129 |
QUADTREE qt; |
| 130 |
{ |
| 131 |
register QUADTREE lf; |
| 132 |
|
| 133 |
if (!QT_IS_LEAF(qt) || (lf = QT_SET_INDEX(qt)) >= qtnumsets) |
| 134 |
error(CONSISTENCY, "bad node in qtqueryset"); |
| 135 |
return(qtsettab[lf]); |
| 136 |
} |
| 137 |
#endif |
| 138 |
|
| 139 |
|
| 140 |
qtfreeleaf(qt) /* free set and leaf node */ |
| 141 |
QUADTREE qt; |
| 142 |
{ |
| 143 |
register QUADTREE osi; |
| 144 |
|
| 145 |
if (!QT_IS_LEAF(qt)) |
| 146 |
return; |
| 147 |
osi = QT_SET_INDEX(qt); |
| 148 |
if (osi >= qtnumsets) |
| 149 |
return; |
| 150 |
free((char *)qtsettab[osi]); |
| 151 |
qtsettab[osi] = (OBJECT *)qtfreesets; |
| 152 |
qtfreesets = osi; |
| 153 |
} |
| 154 |
|
| 155 |
|
| 156 |
|
| 157 |
qtfreeleaves() /* free ALL sets and leaf nodes */ |
| 158 |
{ |
| 159 |
register int i; |
| 160 |
|
| 161 |
while ((i = qtfreesets) != EMPTY) { |
| 162 |
qtfreesets = (int)qtsettab[i]; |
| 163 |
qtsettab[i] = NULL; |
| 164 |
} |
| 165 |
for (i = qtnumsets; i--; ) |
| 166 |
if (qtsettab[i] != NULL) |
| 167 |
free((char *)qtsettab[i]); |
| 168 |
free((char *)qtsettab); |
| 169 |
qtsettab = NULL; |
| 170 |
qtnumsets = 0; |
| 171 |
} |
| 172 |
|
| 173 |
|
| 174 |
check_set(os, cs) /* modify checked set and set to check */ |
| 175 |
register OBJECT *os; /* os' = os - cs */ |
| 176 |
register OBJECT *cs; /* cs' = cs + os */ |
| 177 |
{ |
| 178 |
OBJECT cset[QT_MAXCSET+QT_MAXSET+1]; |
| 179 |
register int i, j; |
| 180 |
int k; |
| 181 |
/* copy os in place, cset <- cs */ |
| 182 |
cset[0] = 0; |
| 183 |
k = 0; |
| 184 |
for (i = j = 1; i <= os[0]; i++) { |
| 185 |
while (j <= cs[0] && cs[j] < os[i]) |
| 186 |
cset[++cset[0]] = cs[j++]; |
| 187 |
if (j > cs[0] || os[i] != cs[j]) { /* object to check */ |
| 188 |
os[++k] = os[i]; |
| 189 |
cset[++cset[0]] = os[i]; |
| 190 |
} |
| 191 |
} |
| 192 |
if (!(os[0] = k)) /* new "to check" set size */ |
| 193 |
return; /* special case */ |
| 194 |
while (j <= cs[0]) /* get the rest of cs */ |
| 195 |
cset[++cset[0]] = cs[j++]; |
| 196 |
if (cset[0] > QT_MAXCSET) /* truncate "checked" set if nec. */ |
| 197 |
cset[0] = QT_MAXCSET; |
| 198 |
/* setcopy(cs, cset); */ /* copy cset back to cs */ |
| 199 |
os = cset; |
| 200 |
for (i = os[0]; i-- >= 0; ) |
| 201 |
*cs++ = *os++; |
| 202 |
} |
| 203 |
|
