src/rt/t_data.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  t_data.c - routine for stored textures
 */

/* ====================================================================
 * 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  "ray.h"

#include  "data.h"

#include  "func.h"

/*
 *      A stored texture is specified as follows:
 *
 *      modifier texdata name
 *      8+ xfunc yfunc zfunc xdfname ydfname zdfname vfname v0 v1 .. xf
 *      0
 *      n A1 A2 .. An
 *
 *  Vfname is the name of the file where the variable definitions
 *  can be found.  The list of real arguments can be accessed by
 *  definitions in the file.  The dfnames are the data file
 *  names.  The dimensions of the data files and the number
 *  of variables must match.  The funcs take three arguments to produce
 *  interpolated values from the file.  The xf is a transformation
 *  to get from the original coordinates to the current coordinates.
 */


t_data(m, r)                    /* interpolate texture data */
register OBJREC  *m;
RAY  *r;
{
        int  nv;
        FVECT  disp;
        double  dval[3], pt[MAXDIM];
        double  d;
        DATARRAY  *dp;
        register MFUNC  *mf;
        register int  i;

        if (m->oargs.nsargs < 8)
                objerror(m, USER, "bad # arguments");
        dp = getdata(m->oargs.sarg[3]);
        i = (1 << (nv = dp->nd)) - 1;
        mf = getfunc(m, 6, i<<7, 1);
        setfunc(m, r);
        errno = 0;
        for (i = 0; i < nv; i++)
                pt[i] = evalue(mf->ep[i]);
        if (errno)
                goto computerr;
        dval[0] = datavalue(dp, pt);
        for (i = 1; i < 3; i++) {
                dp = getdata(m->oargs.sarg[i+3]);
                if (dp->nd != nv)
                        objerror(m, USER, "dimension error");
                dval[i] = datavalue(dp, pt);
        }
        errno = 0;
        for (i = 0; i < 3; i++)
                disp[i] = funvalue(m->oargs.sarg[i], 3, dval);
        if (errno)
                goto computerr;
        if (mf->f != &unitxf)
                multv3(disp, disp, mf->f->xfm);
        if (r->rox != NULL) {
                multv3(disp, disp, r->rox->f.xfm);
                d = 1.0 / (mf->f->sca * r->rox->f.sca);
        } else
                d = 1.0 / mf->f->sca;
        for (i = 0; i < 3; i++)
                r->pert[i] += disp[i] * d;
        return(0);
computerr:
        objerror(m, WARNING, "compute error");
        return(0);
}
Revision:	2.5
Committed:	Sat Feb 22 02:07:29 2003 UTC (22 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.4:	+57 -5 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			* t_data.c - routine for stored textures
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 "ray.h"
66
67			#include "data.h"
68
69	greg	2.2	#include "func.h"
70
71	greg	1.1	/*
72			* A stored texture is specified as follows:
73			*
74			* modifier texdata name
75			* 8+ xfunc yfunc zfunc xdfname ydfname zdfname vfname v0 v1 .. xf
76			* 0
77			* n A1 A2 .. An
78			*
79			* Vfname is the name of the file where the variable definitions
80			* can be found. The list of real arguments can be accessed by
81			* definitions in the file. The dfnames are the data file
82			* names. The dimensions of the data files and the number
83			* of variables must match. The funcs take three arguments to produce
84			* interpolated values from the file. The xf is a transformation
85			* to get from the original coordinates to the current coordinates.
86			*/
87
88
89			t_data(m, r) /* interpolate texture data */
90			register OBJREC *m;
91			RAY *r;
92			{
93			int nv;
94	greg	2.3	FVECT disp;
95			double dval[3], pt[MAXDIM];
96	greg	1.4	double d;
97	greg	1.1	DATARRAY *dp;
98	greg	2.2	register MFUNC *mf;
99	greg	1.1	register int i;
100
101			if (m->oargs.nsargs < 8)
102			objerror(m, USER, "bad # arguments");
103	greg	2.2	dp = getdata(m->oargs.sarg[3]);
104			i = (1 << (nv = dp->nd)) - 1;
105			mf = getfunc(m, 6, i<<7, 1);
106			setfunc(m, r);
107			errno = 0;
108	greg	2.3	for (i = 0; i < nv; i++)
109	greg	2.2	pt[i] = evalue(mf->ep[i]);
110	greg	2.3	if (errno)
111			goto computerr;
112	greg	2.2	dval[0] = datavalue(dp, pt);
113			for (i = 1; i < 3; i++) {
114			dp = getdata(m->oargs.sarg[i+3]);
115	greg	1.1	if (dp->nd != nv)
116	greg	2.2	objerror(m, USER, "dimension error");
117	greg	1.1	dval[i] = datavalue(dp, pt);
118			}
119			errno = 0;
120	greg	2.3	for (i = 0; i < 3; i++)
121	greg	2.2	disp[i] = funvalue(m->oargs.sarg[i], 3, dval);
122	greg	2.3	if (errno)
123			goto computerr;
124	greg	2.2	if (mf->f != &unitxf)
125			multv3(disp, disp, mf->f->xfm);
126	greg	1.6	if (r->rox != NULL) {
127			multv3(disp, disp, r->rox->f.xfm);
128	greg	2.2	d = 1.0 / (mf->f->sca * r->rox->f.sca);
129	greg	1.6	} else
130	greg	2.2	d = 1.0 / mf->f->sca;
131	greg	1.1	for (i = 0; i < 3; i++)
132	greg	1.4	r->pert[i] += disp[i] * d;
133	greg	2.4	return(0);
134	greg	1.1	computerr:
135			objerror(m, WARNING, "compute error");
136	greg	2.4	return(0);
137	greg	1.1	}