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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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/* ====================================================================
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* The Radiance Software License, Version 1.0
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*
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* Copyright (c) 1990 - 2002 The Regents of the University of California,
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* through Lawrence Berkeley National Laboratory. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes Radiance software
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* (http://radsite.lbl.gov/)
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* developed by the Lawrence Berkeley National Laboratory
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* (http://www.lbl.gov/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
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* and "The Regents of the University of California" must
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* not be used to endorse or promote products derived from this
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* software without prior written permission. For written
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* permission, please contact [email protected].
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*
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* 5. Products derived from this software may not be called "Radiance",
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* nor may "Radiance" appear in their name, without prior written
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* permission of Lawrence Berkeley National Laboratory.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more
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* information on Lawrence Berkeley National Laboratory, please see
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* <http://www.lbl.gov/>.
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*/
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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 BIGMEM
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#define MAXOBLK 32767 /* maximum octree block */
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#else
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#define MAXOBLK 4095 /* 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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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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} 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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#ifdef NOPROTO
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extern OCTREE octalloc();
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extern void octfree();
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extern void octdone();
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extern OCTREE combine();
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extern void culocate();
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extern void cucopy();
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extern int incube();
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extern int readoct();
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#else
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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 void cucopy(CUBE *cu1, CUBE *cu2);
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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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#endif
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