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/* RCSid $Id: octree.h,v 2.12 2009/11/01 04:41:55 greg Exp $ */
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/*
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* octree.h - header file for routines using octrees.
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*/
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#ifndef _RAD_OCTREE_H_
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#define _RAD_OCTREE_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* An octree is expressed as an integer which is either
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* an index to eight other nodes, the empty tree, or an index
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* to a set of objects. If the octree has a value:
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*
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* > -1: it is an index to eight other nodes.
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*
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* -1: it is empty
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*
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* < -1: it is an index to a set of objects
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*/
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#ifndef OCTREE
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#define OCTREE int
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#endif
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#define EMPTY (-1)
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#define isempty(ot) ((ot) == EMPTY)
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#define isfull(ot) ((ot) < EMPTY)
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#define istree(ot) ((ot) > EMPTY)
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#define oseti(ot) (-(ot)-2) /* object set index */
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#define OCTBLKSIZ 04000 /* octree block size */
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#define octbi(ot) ((ot)>>11) /* octree block index */
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#define octti(ot) (((ot)&03777)<<3)/* octree index in block */
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#ifndef MAXOBLK
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#ifdef SMLMEM
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#define MAXOBLK 4095 /* maximum octree block */
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#else
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#define MAXOBLK 262143 /* maximum octree block */
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#endif
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#endif
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extern OCTREE *octblock[MAXOBLK]; /* octree blocks */
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#define octkid(ot,br) (octblock[octbi(ot)][octti(ot)+br])
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/*
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* The cube structure is used to hold an octree and its cubic
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* boundaries.
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*/
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typedef struct {
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FVECT cuorg; /* the cube origin */
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double cusize; /* the cube size */
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OCTREE cutree; /* the octree for this cube */
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} CUBE;
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extern CUBE thescene; /* the main scene */
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/* flags for reading and writing octrees */
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#define IO_CHECK 0 /* verify file type */
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#define IO_INFO 01 /* information header */
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#define IO_SCENE 02 /* objects */
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#define IO_TREE 04 /* octree */
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#define IO_FILES 010 /* object file names */
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#define IO_BOUNDS 020 /* octree boundary */
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#define IO_ALL (~0) /* everything */
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/* octree format identifier */
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#define OCTFMT "Radiance_octree"
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/* magic number for octree files */
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#define MAXOBJSIZ 8 /* maximum sizeof(OBJECT) */
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#define OCTMAGIC ( 4 *MAXOBJSIZ+251) /* increment first value */
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/* octree node types */
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#define OT_EMPTY 0
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#define OT_FULL 1
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#define OT_TREE 2
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/* return values for surface functions */
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#define O_MISS 0 /* no intersection */
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#define O_HIT 1 /* intersection */
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#define O_IN 2 /* cube contained entirely */
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extern OCTREE octalloc(void);
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extern void octfree(OCTREE ot);
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extern void octdone(void);
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extern OCTREE combine(OCTREE ot);
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extern void culocate(CUBE *cu, FVECT pt);
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extern int incube(CUBE *cu, FVECT pt);
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extern int readoct(char *fname, int load, CUBE *scene, char *ofn[]);
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extern void readscene(FILE *fp, int objsiz);
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extern void writescene(int firstobj, int nobjs, FILE *fp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_OCTREE_H_ */
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