1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id$"; |
3 |
#endif |
4 |
/* |
5 |
* mx_func.c - routine for mixture functions. |
6 |
*/ |
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 |
* |
59 |
* 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 |
*/ |
64 |
|
65 |
#include "ray.h" |
66 |
|
67 |
#include "func.h" |
68 |
|
69 |
/* |
70 |
* A mixture function is specified: |
71 |
* |
72 |
* modifier mixfunc name |
73 |
* 4+ foremod backmod varname vfname xf |
74 |
* 0 |
75 |
* n A1 A2 .. |
76 |
* |
77 |
* Vfname is the name of the file where the variable definition |
78 |
* can be found. The list of real arguments can be accessed by |
79 |
* definitions in the file. The xf is a transformation |
80 |
* to get from the original coordinates to the current coordinates. |
81 |
*/ |
82 |
|
83 |
|
84 |
mx_func(m, r) /* compute mixture function */ |
85 |
register OBJREC *m; |
86 |
RAY *r; |
87 |
{ |
88 |
OBJECT obj; |
89 |
register int i; |
90 |
double coef; |
91 |
OBJECT mod[2]; |
92 |
register MFUNC *mf; |
93 |
|
94 |
if (m->oargs.nsargs < 4) |
95 |
objerror(m, USER, "bad # arguments"); |
96 |
obj = objndx(m); |
97 |
for (i = 0; i < 2; i++) |
98 |
if (!strcmp(m->oargs.sarg[i], VOIDID)) |
99 |
mod[i] = OVOID; |
100 |
else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) { |
101 |
sprintf(errmsg, "undefined modifier \"%s\"", |
102 |
m->oargs.sarg[i]); |
103 |
objerror(m, USER, errmsg); |
104 |
} |
105 |
mf = getfunc(m, 3, 0x4, 0); |
106 |
setfunc(m, r); |
107 |
errno = 0; |
108 |
coef = evalue(mf->ep[0]); |
109 |
if (errno) { |
110 |
objerror(m, WARNING, "compute error"); |
111 |
return(0); |
112 |
} |
113 |
if (raymixture(r, mod[0], mod[1], coef)) { |
114 |
if (m->omod != OVOID) |
115 |
objerror(m, USER, "inappropriate modifier"); |
116 |
return(1); |
117 |
} |
118 |
return(0); |
119 |
} |