| 1 |
gwlarson |
3.1 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
| 2 |
|
|
|
| 3 |
|
|
/* SCCSid "$SunId$ SGI" */ |
| 4 |
|
|
|
| 5 |
|
|
/* |
| 6 |
|
|
* sm_qtree.h - header file for routines using spherical quadtrees. |
| 7 |
|
|
* |
| 8 |
|
|
* adapted from octree.h |
| 9 |
|
|
*/ |
| 10 |
|
|
|
| 11 |
|
|
/* |
| 12 |
|
|
* An quadtree is expressed as an integer which is either |
| 13 |
|
|
* an index to 4 other nodes, the empty tree, or an index |
| 14 |
|
|
* to a set of objects. If the quadtree has a value: |
| 15 |
|
|
* |
| 16 |
|
|
* > -1: it is an index to four other nodes. |
| 17 |
|
|
* |
| 18 |
|
|
* -1: it is empty |
| 19 |
|
|
* |
| 20 |
|
|
* < -1: it is an index to a set of objects |
| 21 |
|
|
*/ |
| 22 |
|
|
|
| 23 |
|
|
#define QUADTREE int |
| 24 |
|
|
|
| 25 |
|
|
#define EMPTY (-1) |
| 26 |
|
|
|
| 27 |
|
|
#define QT_IS_EMPTY(qt) ((qt) == EMPTY) |
| 28 |
|
|
#define QT_IS_LEAF(qt) ((qt) < EMPTY) |
| 29 |
|
|
#define QT_IS_TREE(qt) ((qt) > EMPTY) |
| 30 |
|
|
|
| 31 |
|
|
#define QT_INDEX(qt) (-(qt)-2) /* quadtree node from set */ |
| 32 |
|
|
#define QT_SET_INDEX(i) (-((i)+2)) /* object set from node */ |
| 33 |
|
|
#define QT_BLOCK(qt) ((qt)>>8) /* quadtree block index */ |
| 34 |
|
|
#define QT_BLOCK_INDEX(qt) (((qt)&0377)<<2) /* quadtree index in block */ |
| 35 |
|
|
|
| 36 |
|
|
#ifndef QT_MAX_BLK |
| 37 |
|
|
#ifdef BIGMEM |
| 38 |
|
|
#define QT_MAX_BLK 65535 /* maximum quadtree block */ |
| 39 |
|
|
#else |
| 40 |
|
|
#define QT_MAX_BLK 8191 /* maximum quadtree block */ |
| 41 |
|
|
#endif |
| 42 |
|
|
#endif |
| 43 |
|
|
|
| 44 |
|
|
|
| 45 |
|
|
|
| 46 |
|
|
#define QT_NTH_CHILD(qt,br) (quad_block[QT_BLOCK(qt)][QT_BLOCK_INDEX(qt)+br]) |
| 47 |
|
|
#define QT_NTH_CHILD_PTR(qt,br) \ |
| 48 |
|
|
(&(quad_block[QT_BLOCK(qt)][QT_BLOCK_INDEX(qt)+br])) |
| 49 |
|
|
#define QT_CLEAR_CHILDREN(qt) (QT_NTH_CHILD(qt,0)=EMPTY, \ |
| 50 |
|
|
QT_NTH_CHILD(qt,1)=EMPTY,QT_NTH_CHILD(qt,2)=EMPTY,QT_NTH_CHILD(qt,3)=EMPTY) |
| 51 |
|
|
|
| 52 |
|
|
|
| 53 |
|
|
#if 0 |
| 54 |
|
|
#define QT_EMPTY 0 |
| 55 |
|
|
#define QT_FULL 1 |
| 56 |
|
|
#define QT_TREE 2 |
| 57 |
|
|
#endif |
| 58 |
|
|
|
| 59 |
|
|
|
| 60 |
|
|
|
| 61 |
|
|
/* OBJECT SET CODE */ |
| 62 |
|
|
#define QT_SET_CNT(s) ((s)[0]) |
| 63 |
|
|
#define QT_SET_NTH_ELEM(s,n) ((s)[(n)]) |
| 64 |
|
|
|
| 65 |
|
|
#define QT_CLEAR_SET(s) ((s)[0] = 0) |
| 66 |
|
|
#define QT_SET_NEXT_ELEM(p) (*(p)++) |
| 67 |
|
|
#define QT_SET_PTR(s) (&((s)[1])) |
| 68 |
|
|
|
| 69 |
|
|
|
| 70 |
|
|
#define QT_MAX_SET MAXSET |
| 71 |
|
|
#define MAXCSET MAXSET*2 |
| 72 |
|
|
#ifndef QT_SET_THRESHOLD |
| 73 |
|
|
#define QT_SET_THRESHOLD 40 |
| 74 |
|
|
#endif |
| 75 |
|
|
|
| 76 |
|
|
#ifndef QT_MAX_LEVELS |
| 77 |
|
|
#define QT_MAX_LEVELS 16 |
| 78 |
|
|
#endif |
| 79 |
|
|
|
| 80 |
|
|
#define QT_BLOCK_SIZE 256 |
| 81 |
|
|
|
| 82 |
|
|
extern QUADTREE qtnewleaf(), qtaddelem(), qtdelelem(); |
| 83 |
|
|
|
| 84 |
|
|
extern QUADTREE *quad_block[QT_MAX_BLK]; /* quadtree blocks */ |
