src/common/octree.h

/* RCSid $Id: octree.h,v 2.8 2003/05/15 05:13:35 greg Exp $ */
/*
 *  octree.h - header file for routines using octrees.
 */
#ifndef _RAD_OCTREE_H_
#define _RAD_OCTREE_H_
#ifdef __cplusplus
extern "C" {
#endif

#include "copyright.h"

/*
 *      An octree is expressed as an integer which is either
 *      an index to eight other nodes, the empty tree, or an index
 *      to a set of objects.  If the octree has a value:
 *
 *              > -1:   it is an index to eight other nodes.
 *
 *              -1:     it is empty
 *
 *              < -1:   it is an index to a set of objects
 */

#ifndef  OCTREE
#define  OCTREE         int
#endif

#define  EMPTY          (-1)

#define  isempty(ot)    ((ot) == EMPTY)
#define  isfull(ot)     ((ot) < EMPTY)
#define  istree(ot)     ((ot) > EMPTY)

#define  oseti(ot)      (-(ot)-2)       /* object set index */
#define  OCTBLKSIZ      04000           /* octree block size */
#define  octbi(ot)      ((ot)>>11)      /* octree block index */
#define  octti(ot)      (((ot)&03777)<<3)/* octree index in block */

#ifndef  MAXOBLK
#ifdef  SMLMEM
#define  MAXOBLK        4095            /* maximum octree block */
#else
#define  MAXOBLK        32767           /* maximum octree block */
#endif
#endif

extern OCTREE  *octblock[MAXOBLK];      /* octree blocks */

#define  octkid(ot,br)  (octblock[octbi(ot)][octti(ot)+br])

/*
 *      The cube structure is used to hold an octree and its cubic
 *      boundaries.
 */

typedef struct {
        OCTREE  cutree;                 /* the octree for this cube */
        FVECT  cuorg;                   /* the cube origin */
        double  cusize;                 /* the cube size */
}  CUBE;

extern CUBE  thescene;                  /* the main scene */

                                /* flags for reading and writing octrees */
#define  IO_CHECK       0               /* verify file type */
#define  IO_INFO        01              /* information header */
#define  IO_SCENE       02              /* objects */
#define  IO_TREE        04              /* octree */
#define  IO_FILES       010             /* object file names */
#define  IO_BOUNDS      020             /* octree boundary */
#define  IO_ALL         (~0)            /* everything */
                                /* octree format identifier */
#define  OCTFMT         "Radiance_octree"
                                /* magic number for octree files */
#define  MAXOBJSIZ      8               /* maximum sizeof(OBJECT) */
#define  OCTMAGIC       ( 4 *MAXOBJSIZ+251)     /* increment first value */
                                /* octree node types */
#define  OT_EMPTY       0
#define  OT_FULL        1
#define  OT_TREE        2
                                /* return values for surface functions */
#define  O_MISS         0               /* no intersection */
#define  O_HIT          1               /* intersection */
#define  O_IN           2               /* cube contained entirely */


extern OCTREE   octalloc(void);
extern void     octfree(OCTREE ot);
extern void     octdone(void);
extern OCTREE   combine(OCTREE ot);
extern void     culocate(CUBE *cu, FVECT pt);
extern void     cucopy(CUBE *cu1, CUBE *cu2);
extern int      incube(CUBE *cu, FVECT pt);

extern int      readoct(char *fname, int load, CUBE *scene, char *ofn[]);

extern void     readscene(FILE *fp, int objsiz);
extern void     writescene(int firstobj, int nobjs, FILE *fp);


#ifdef __cplusplus
}
#endif
#endif /* _RAD_OCTREE_H_ */

Revision:	2.9
Committed:	Fri Jun 6 16:38:47 2003 UTC (20 years, 10 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.8:	+11 -15 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	schorsch	2.9	/* RCSid $Id: octree.h,v 2.8 2003/05/15 05:13:35 greg Exp $ */
2	greg	1.1	/*
3			* octree.h - header file for routines using octrees.
4	greg	2.5	*/
5	schorsch	2.9	#ifndef _RAD_OCTREE_H_
6			#define _RAD_OCTREE_H_
7			#ifdef __cplusplus
8			extern "C" {
9			#endif
10	greg	2.5
11	greg	2.6	#include "copyright.h"
12	greg	1.1
13			/*
14			* An octree is expressed as an integer which is either
15			* an index to eight other nodes, the empty tree, or an index
16			* to a set of objects. If the octree has a value:
17			*
18			* > -1: it is an index to eight other nodes.
19			*
20			* -1: it is empty
21			*
22			* < -1: it is an index to a set of objects
23			*/
24
25	greg	1.5	#ifndef OCTREE
26			#define OCTREE int
27			#endif
28	greg	1.1
29			#define EMPTY (-1)
30
31			#define isempty(ot) ((ot) == EMPTY)
32			#define isfull(ot) ((ot) < EMPTY)
33			#define istree(ot) ((ot) > EMPTY)
34
35			#define oseti(ot) (-(ot)-2) /* object set index */
36	gwlarson	2.4	#define OCTBLKSIZ 04000 /* octree block size */
37			#define octbi(ot) ((ot)>>11) /* octree block index */
38			#define octti(ot) (((ot)&03777)<<3)/* octree index in block */
39	greg	1.1
40	greg	1.5	#ifndef MAXOBLK
41	greg	2.8	#ifdef SMLMEM
42			#define MAXOBLK 4095 /* maximum octree block */
43			#else
44	gwlarson	2.4	#define MAXOBLK 32767 /* maximum octree block */
45	greg	1.5	#endif
46			#endif
47	greg	1.1
48			extern OCTREE octblock[MAXOBLK]; / octree blocks */
49
50			#define octkid(ot,br) (octblock[octbi(ot)][octti(ot)+br])
51
52			/*
53			* The cube structure is used to hold an octree and its cubic
54			* boundaries.
55			*/
56
57			typedef struct {
58			OCTREE cutree; /* the octree for this cube */
59			FVECT cuorg; /* the cube origin */
60			double cusize; /* the cube size */
61			} CUBE;
62
63			extern CUBE thescene; /* the main scene */
64
65			/* flags for reading and writing octrees */
66			#define IO_CHECK 0 /* verify file type */
67			#define IO_INFO 01 /* information header */
68			#define IO_SCENE 02 /* objects */
69			#define IO_TREE 04 /* octree */
70			#define IO_FILES 010 /* object file names */
71			#define IO_BOUNDS 020 /* octree boundary */
72			#define IO_ALL (~0) /* everything */
73	greg	1.4	/* octree format identifier */
74			#define OCTFMT "Radiance_octree"
75	greg	1.1	/* magic number for octree files */
76	greg	1.5	#define MAXOBJSIZ 8 /* maximum sizeof(OBJECT) */
77			#define OCTMAGIC ( 4 MAXOBJSIZ+251) / increment first value */
78	greg	1.1	/* octree node types */
79			#define OT_EMPTY 0
80			#define OT_FULL 1
81			#define OT_TREE 2
82	greg	1.2	/* return values for surface functions */
83			#define O_MISS 0 /* no intersection */
84			#define O_HIT 1 /* intersection */
85			#define O_IN 2 /* cube contained entirely */
86	greg	2.5
87
88			extern OCTREE octalloc(void);
89			extern void octfree(OCTREE ot);
90			extern void octdone(void);
91			extern OCTREE combine(OCTREE ot);
92			extern void culocate(CUBE *cu, FVECT pt);
93			extern void cucopy(CUBE cu1, CUBE cu2);
94			extern int incube(CUBE *cu, FVECT pt);
95
96			extern int readoct(char fname, int load, CUBE scene, char *ofn[]);
97	greg	2.7
98			extern void readscene(FILE *fp, int objsiz);
99			extern void writescene(int firstobj, int nobjs, FILE *fp);
100	greg	2.5
101	schorsch	2.9
102			#ifdef __cplusplus
103			}
104	greg	2.5	#endif
105	schorsch	2.9	#endif /* _RAD_OCTREE_H_ */
106