src/rt/mx_func.c

#ifndef lint
static const char       RCSid[] = "$Id: mx_func.c,v 2.7 2003/03/05 16:16:53 greg Exp $";
#endif
/*
 *  mx_func.c - routine for mixture functions.
 */

#include "copyright.h"

#include  "ray.h"
#include  "func.h"
#include  "rtotypes.h"

/*
 *      A mixture function is specified:
 *
 *      modifier mixfunc name
 *      4+ foremod backmod varname vfname xf
 *      0
 *      n A1 A2 ..
 *
 *  Vfname is the name of the file where the variable definition
 *  can be found.  The list of real arguments can be accessed by
 *  definitions in the file.  The xf is a transformation
 *  to get from the original coordinates to the current coordinates.
 */


extern int
mx_func(                        /* compute mixture function */
        register OBJREC  *m,
        RAY  *r
)
{
        OBJECT  obj;
        register int  i;
        double  coef;
        OBJECT  mod[2];
        register MFUNC  *mf;

        if (m->oargs.nsargs < 4)
                objerror(m, USER, "bad # arguments");
        obj = objndx(m);
        for (i = 0; i < 2; i++)
                if (!strcmp(m->oargs.sarg[i], VOIDID))
                        mod[i] = OVOID;
                else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
                        sprintf(errmsg, "undefined modifier \"%s\"",
                                        m->oargs.sarg[i]);
                        objerror(m, USER, errmsg);
                }
        mf = getfunc(m, 3, 0x4, 0);
        setfunc(m, r);
        errno = 0;
        coef = evalue(mf->ep[0]);
        if (errno == EDOM || errno == ERANGE) {
                objerror(m, WARNING, "compute error");
                return(0);
        }
        if (raymixture(r, mod[0], mod[1], coef)) {
                if (m->omod != OVOID)
                        objerror(m, USER, "inappropriate modifier");
                return(1);
        }
        return(0);
}
Revision:	2.8
Committed:	Tue Mar 30 16:13:01 2004 UTC (21 years, 7 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R7P2, rad3R7P1, rad4R1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9
Changes since 2.7:	+7 -5 lines
Log Message:	Continued ANSIfication. There are only bits and pieces left now.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	schorsch	2.8	static const char RCSid[] = "$Id: mx_func.c,v 2.7 2003/03/05 16:16:53 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* mx_func.c - routine for mixture functions.
6	greg	2.5	*/
7
8	greg	2.6	#include "copyright.h"
9	greg	1.1
10			#include "ray.h"
11	greg	2.2	#include "func.h"
12	schorsch	2.8	#include "rtotypes.h"
13	greg	2.2
14	greg	1.1	/*
15			* A mixture function is specified:
16			*
17			* modifier mixfunc name
18			* 4+ foremod backmod varname vfname xf
19			* 0
20			* n A1 A2 ..
21			*
22			* Vfname is the name of the file where the variable definition
23			* can be found. The list of real arguments can be accessed by
24			* definitions in the file. The xf is a transformation
25			* to get from the original coordinates to the current coordinates.
26			*/
27
28
29	schorsch	2.8	extern int
30			mx_func( /* compute mixture function */
31			register OBJREC *m,
32			RAY *r
33			)
34	greg	1.1	{
35	gwlarson	2.4	OBJECT obj;
36	greg	1.1	register int i;
37			double coef;
38			OBJECT mod[2];
39	greg	2.2	register MFUNC *mf;
40	greg	1.1
41			if (m->oargs.nsargs < 4)
42			objerror(m, USER, "bad # arguments");
43	gwlarson	2.4	obj = objndx(m);
44	greg	1.1	for (i = 0; i < 2; i++)
45	greg	2.2	if (!strcmp(m->oargs.sarg[i], VOIDID))
46	greg	1.1	mod[i] = OVOID;
47	gwlarson	2.4	else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
48	greg	2.2	sprintf(errmsg, "undefined modifier \"%s\"",
49			m->oargs.sarg[i]);
50	greg	1.1	objerror(m, USER, errmsg);
51			}
52	greg	2.2	mf = getfunc(m, 3, 0x4, 0);
53			setfunc(m, r);
54	greg	1.1	errno = 0;
55	greg	2.2	coef = evalue(mf->ep[0]);
56	greg	2.7	if (errno == EDOM \|\| errno == ERANGE) {
57	greg	1.1	objerror(m, WARNING, "compute error");
58	greg	2.3	return(0);
59	greg	1.1	}
60	greg	2.3	if (raymixture(r, mod[0], mod[1], coef)) {
61			if (m->omod != OVOID)
62			objerror(m, USER, "inappropriate modifier");
63			return(1);
64			}
65			return(0);
66	greg	1.1	}