1 |
/* Copyright (c) 1986 Regents of the University of California */ |
2 |
|
3 |
/* SCCSid "$SunId$ LBL" */ |
4 |
|
5 |
/* |
6 |
* octree.h - header file for routines using octrees. |
7 |
* |
8 |
* 7/28/85 |
9 |
*/ |
10 |
|
11 |
/* |
12 |
* An octree is expressed as an integer which is either |
13 |
* an index to eight other nodes, the empty tree, or an index |
14 |
* to a set of objects. If the octree has a value: |
15 |
* |
16 |
* > -1: it is an index to eight other nodes. |
17 |
* |
18 |
* -1: it is empty |
19 |
* |
20 |
* < -1: it is an index to a set of objects |
21 |
*/ |
22 |
|
23 |
#ifndef OCTREE |
24 |
#define OCTREE int |
25 |
#endif |
26 |
|
27 |
#define EMPTY (-1) |
28 |
|
29 |
#define isempty(ot) ((ot) == EMPTY) |
30 |
#define isfull(ot) ((ot) < EMPTY) |
31 |
#define istree(ot) ((ot) > EMPTY) |
32 |
|
33 |
#define oseti(ot) (-(ot)-2) /* object set index */ |
34 |
#define octbi(ot) ((ot)>>8) /* octree block index */ |
35 |
#define octti(ot) (((ot)&0377)<<3)/* octree index in block */ |
36 |
|
37 |
#ifndef MAXOBLK |
38 |
#ifdef BIGMEM |
39 |
#define MAXOBLK 65535 /* maximum octree block */ |
40 |
#else |
41 |
#define MAXOBLK 8191 /* maximum octree block */ |
42 |
#endif |
43 |
#endif |
44 |
|
45 |
extern OCTREE *octblock[MAXOBLK]; /* octree blocks */ |
46 |
|
47 |
#define octkid(ot,br) (octblock[octbi(ot)][octti(ot)+br]) |
48 |
|
49 |
extern OCTREE octalloc(), combine(), fullnode(); |
50 |
|
51 |
/* |
52 |
* The cube structure is used to hold an octree and its cubic |
53 |
* boundaries. |
54 |
*/ |
55 |
|
56 |
typedef struct { |
57 |
OCTREE cutree; /* the octree for this cube */ |
58 |
FVECT cuorg; /* the cube origin */ |
59 |
double cusize; /* the cube size */ |
60 |
} CUBE; |
61 |
|
62 |
extern CUBE thescene; /* the main scene */ |
63 |
|
64 |
/* flags for reading and writing octrees */ |
65 |
#define IO_CHECK 0 /* verify file type */ |
66 |
#define IO_INFO 01 /* information header */ |
67 |
#define IO_SCENE 02 /* objects */ |
68 |
#define IO_TREE 04 /* octree */ |
69 |
#define IO_FILES 010 /* object file names */ |
70 |
#define IO_BOUNDS 020 /* octree boundary */ |
71 |
#define IO_ALL (~0) /* everything */ |
72 |
/* octree format identifier */ |
73 |
#define OCTFMT "Radiance_octree" |
74 |
/* magic number for octree files */ |
75 |
#define MAXOBJSIZ 8 /* maximum sizeof(OBJECT) */ |
76 |
#define OCTMAGIC ( 4 *MAXOBJSIZ+251) /* increment first value */ |
77 |
/* octree node types */ |
78 |
#define OT_EMPTY 0 |
79 |
#define OT_FULL 1 |
80 |
#define OT_TREE 2 |
81 |
/* return values for surface functions */ |
82 |
#define O_MISS 0 /* no intersection */ |
83 |
#define O_HIT 1 /* intersection */ |
84 |
#define O_IN 2 /* cube contained entirely */ |