src/common/octree.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  octree.c - routines dealing with octrees and cubes.
 */

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

#include  "standard.h"

#include  "octree.h"

OCTREE  *octblock[MAXOBLK];             /* our octree */
static OCTREE  ofreelist = EMPTY;       /* freed octree nodes */
static OCTREE  treetop = 0;             /* next free node */


OCTREE
octalloc()                      /* allocate an octree */
{
        register OCTREE  freet;

        if ((freet = ofreelist) != EMPTY) {
                ofreelist = octkid(freet, 0);
                return(freet);
        }
        freet = treetop;
        if (octti(freet) == 0) {
                errno = 0;
                if (octbi(freet) >= MAXOBLK)
                        return(EMPTY);
                if ((octblock[octbi(freet)] = (OCTREE *)malloc(
                                (unsigned)OCTBLKSIZ*8*sizeof(OCTREE))) == NULL)
                        return(EMPTY);
        }
        treetop += 8;
        return(freet);
}


void
octfree(ot)                     /* free an octree */
register OCTREE  ot;
{
        register int  i;

        if (!istree(ot))
                return;
        for (i = 0; i < 8; i++)
                octfree(octkid(ot, i));
        octkid(ot, 0) = ofreelist;
        ofreelist = ot;
}


void
octdone()                       /* free EVERYTHING */
{
        register int    i;

        for (i = 0; i < MAXOBLK; i++) {
                if (octblock[i] == NULL)
                        break;
                free((void *)octblock[i]);
                octblock[i] = NULL;
        }
        ofreelist = EMPTY;
        treetop = 0;
}


OCTREE
combine(ot)                     /* recursively combine nodes */
register OCTREE  ot;
{
        register int  i;
        register OCTREE  ores;

        if (!istree(ot))        /* not a tree */
                return(ot);
        ores = octkid(ot, 0) = combine(octkid(ot, 0));
        for (i = 1; i < 8; i++)
                if ((octkid(ot, i) = combine(octkid(ot, i))) != ores)
                        ores = ot;
        if (!istree(ores)) {    /* all were identical leaves */
                octkid(ot, 0) = ofreelist;
                ofreelist = ot;
        }
        return(ores);
}


void
culocate(cu, pt)                /* locate point within cube */
register CUBE  *cu;
register FVECT  pt;
{
        register int  i;
        int  branch;

        while (istree(cu->cutree)) {
                cu->cusize *= 0.5;
                branch = 0;
                for (i = 0; i < 3; i++)
                        if (cu->cuorg[i] + cu->cusize <= pt[i]) {
                                cu->cuorg[i] += cu->cusize;
                                branch |= 1 << i;
                        }
                cu->cutree = octkid(cu->cutree, branch);
        }
}


void
cucopy(cu1, cu2)                /* copy cu2 into cu1 */
register CUBE  *cu1, *cu2;
{
        cu1->cutree = cu2->cutree;
        cu1->cusize = cu2->cusize;
        VCOPY(cu1->cuorg, cu2->cuorg);
}


int
incube(cu, pt)                  /* determine if a point is inside a cube */
register CUBE  *cu;
register FVECT  pt;
{
        if (cu->cuorg[0] > pt[0] || pt[0] >= cu->cuorg[0] + cu->cusize)
                return(0);
        if (cu->cuorg[1] > pt[1] || pt[1] >= cu->cuorg[1] + cu->cusize)
                return(0);
        if (cu->cuorg[2] > pt[2] || pt[2] >= cu->cuorg[2] + cu->cusize)
                return(0);
        return(1);
}
Revision:	2.5
Committed:	Sat Feb 22 02:07:22 2003 UTC (22 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.4:	+64 -7 lines
Log Message:	Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.5	static const char RCSid[] = "$Id$";
3	greg	1.1	#endif
4			/*
5			* octree.c - routines dealing with octrees and cubes.
6	greg	2.5	*/
7
8			/* ====================================================================
9			* The Radiance Software License, Version 1.0
10			*
11			* Copyright (c) 1990 - 2002 The Regents of the University of California,
12			* through Lawrence Berkeley National Laboratory. All rights reserved.
13			*
14			* Redistribution and use in source and binary forms, with or without
15			* modification, are permitted provided that the following conditions
16			* are met:
17			*
18			* 1. Redistributions of source code must retain the above copyright
19			* notice, this list of conditions and the following disclaimer.
20			*
21			* 2. Redistributions in binary form must reproduce the above copyright
22			* notice, this list of conditions and the following disclaimer in
23			* the documentation and/or other materials provided with the
24			* distribution.
25			*
26			* 3. The end-user documentation included with the redistribution,
27			* if any, must include the following acknowledgment:
28			* "This product includes Radiance software
29			* (http://radsite.lbl.gov/)
30			* developed by the Lawrence Berkeley National Laboratory
31			* (http://www.lbl.gov/)."
32			* Alternately, this acknowledgment may appear in the software itself,
33			* if and wherever such third-party acknowledgments normally appear.
34			*
35			* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
36			* and "The Regents of the University of California" must
37			* not be used to endorse or promote products derived from this
38			* software without prior written permission. For written
39			* permission, please contact [email protected].
40			*
41			* 5. Products derived from this software may not be called "Radiance",
42			* nor may "Radiance" appear in their name, without prior written
43			* permission of Lawrence Berkeley National Laboratory.
44			*
45			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
46			* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
47			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
48			* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
49			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
50			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
51			* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
52			* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
53			* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
54			* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
55			* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56			* SUCH DAMAGE.
57			* ====================================================================
58	greg	1.1	*
59	greg	2.5	* This software consists of voluntary contributions made by many
60			* individuals on behalf of Lawrence Berkeley National Laboratory. For more
61			* information on Lawrence Berkeley National Laboratory, please see
62			* <http://www.lbl.gov/>.
63	greg	1.1	*/
64
65			#include "standard.h"
66
67			#include "octree.h"
68
69			OCTREE octblock[MAXOBLK]; / our octree */
70	greg	1.2	static OCTREE ofreelist = EMPTY; /* freed octree nodes */
71	greg	1.1	static OCTREE treetop = 0; /* next free node */
72
73
74			OCTREE
75			octalloc() /* allocate an octree */
76			{
77			register OCTREE freet;
78
79			if ((freet = ofreelist) != EMPTY) {
80			ofreelist = octkid(freet, 0);
81			return(freet);
82			}
83			freet = treetop;
84			if (octti(freet) == 0) {
85			errno = 0;
86			if (octbi(freet) >= MAXOBLK)
87			return(EMPTY);
88	greg	2.5	if ((octblock[octbi(freet)] = (OCTREE *)malloc(
89	gwlarson	2.4	(unsigned)OCTBLKSIZ8sizeof(OCTREE))) == NULL)
90	greg	1.1	return(EMPTY);
91			}
92			treetop += 8;
93			return(freet);
94			}
95
96
97	greg	2.5	void
98	greg	1.1	octfree(ot) /* free an octree */
99			register OCTREE ot;
100			{
101			register int i;
102
103			if (!istree(ot))
104			return;
105			for (i = 0; i < 8; i++)
106			octfree(octkid(ot, i));
107			octkid(ot, 0) = ofreelist;
108			ofreelist = ot;
109			}
110
111
112	greg	2.5	void
113	greg	2.2	octdone() /* free EVERYTHING */
114			{
115			register int i;
116
117			for (i = 0; i < MAXOBLK; i++) {
118	gwlarson	2.3	if (octblock[i] == NULL)
119			break;
120	greg	2.5	free((void *)octblock[i]);
121	greg	2.2	octblock[i] = NULL;
122			}
123			ofreelist = EMPTY;
124			treetop = 0;
125			}
126
127
128	greg	1.1	OCTREE
129			combine(ot) /* recursively combine nodes */
130			register OCTREE ot;
131			{
132			register int i;
133			register OCTREE ores;
134
135			if (!istree(ot)) /* not a tree */
136			return(ot);
137			ores = octkid(ot, 0) = combine(octkid(ot, 0));
138			for (i = 1; i < 8; i++)
139			if ((octkid(ot, i) = combine(octkid(ot, i))) != ores)
140			ores = ot;
141	greg	1.2	if (!istree(ores)) { /* all were identical leaves */
142			octkid(ot, 0) = ofreelist;
143			ofreelist = ot;
144			}
145	greg	1.1	return(ores);
146			}
147
148
149	greg	2.5	void
150	greg	1.1	culocate(cu, pt) /* locate point within cube */
151			register CUBE *cu;
152			register FVECT pt;
153			{
154			register int i;
155			int branch;
156
157			while (istree(cu->cutree)) {
158			cu->cusize *= 0.5;
159			branch = 0;
160			for (i = 0; i < 3; i++)
161			if (cu->cuorg[i] + cu->cusize <= pt[i]) {
162			cu->cuorg[i] += cu->cusize;
163			branch \|= 1 << i;
164			}
165			cu->cutree = octkid(cu->cutree, branch);
166			}
167			}
168
169
170	greg	2.5	void
171	greg	1.1	cucopy(cu1, cu2) /* copy cu2 into cu1 */
172			register CUBE cu1, cu2;
173			{
174			cu1->cutree = cu2->cutree;
175			cu1->cusize = cu2->cusize;
176			VCOPY(cu1->cuorg, cu2->cuorg);
177			}
178
179
180	greg	2.5	int
181	greg	1.1	incube(cu, pt) /* determine if a point is inside a cube */
182			register CUBE *cu;
183			register FVECT pt;
184			{
185			if (cu->cuorg[0] > pt[0] \|\| pt[0] >= cu->cuorg[0] + cu->cusize)
186			return(0);
187			if (cu->cuorg[1] > pt[1] \|\| pt[1] >= cu->cuorg[1] + cu->cusize)
188			return(0);
189			if (cu->cuorg[2] > pt[2] \|\| pt[2] >= cu->cuorg[2] + cu->cusize)
190			return(0);
191			return(1);
192			}