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/* Copyright (c) 1986 Regents of the University of California */ |
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/* SCCSid "$SunId$ LBL" */ |
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/* RCSid $Id$ */ |
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/* |
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* octree.h - header file for routines using octrees. |
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* |
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* 7/28/85 |
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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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#define istree(ot) ((ot) > EMPTY) |
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#define oseti(ot) (-(ot)-2) /* object set index */ |
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#define octbi(ot) ((ot)>>8) /* octree block index */ |
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#define octti(ot) (((ot)&0377)<<3)/* octree index in block */ |
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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 BIGMEM |
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#define MAXOBLK 65535 /* maximum octree block */ |
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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 8191 /* maximum octree block */ |
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#define MAXOBLK 262143 /* maximum octree block */ |
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#endif |
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#endif |
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#define octkid(ot,br) (octblock[octbi(ot)][octti(ot)+br]) |
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extern OCTREE octalloc(), combine(), fullnode(); |
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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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OCTREE cutree; /* the octree for this cube */ |
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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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#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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