src/rt/mx_func.c

/* Copyright (c) 1998 Silicon Graphics, Inc. */

#ifndef lint
static char SCCSid[] = "$SunId$ SGI";
#endif

/*
 *  mx_func.c - routine for mixture functions.
 *
 *     11/2/88
 */

#include  "ray.h"

#include  "func.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.
 */


mx_func(m, r)                   /* 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) {
                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:	2.4
Committed:	Mon Aug 10 18:35:14 1998 UTC (25 years, 8 months ago) by gwlarson
Content type:	text/plain
Branch:	MAIN
Changes since 2.3:	+5 -3 lines
Log Message:	changed modifier checking to take most recent definition
#	User	Rev	Content
1	gwlarson	2.4	/* Copyright (c) 1998 Silicon Graphics, Inc. */
2	greg	1.1
3			#ifndef lint
4	gwlarson	2.4	static char SCCSid[] = "$SunId$ SGI";
5	greg	1.1	#endif
6
7			/*
8			* mx_func.c - routine for mixture functions.
9			*
10			* 11/2/88
11			*/
12
13			#include "ray.h"
14
15	greg	2.2	#include "func.h"
16
17	greg	1.1	/*
18			* A mixture function is specified:
19			*
20			* modifier mixfunc name
21			* 4+ foremod backmod varname vfname xf
22			* 0
23			* n A1 A2 ..
24			*
25			* Vfname is the name of the file where the variable definition
26			* can be found. The list of real arguments can be accessed by
27			* definitions in the file. The xf is a transformation
28			* to get from the original coordinates to the current coordinates.
29			*/
30
31
32			mx_func(m, r) /* compute mixture function */
33			register OBJREC *m;
34			RAY *r;
35			{
36	gwlarson	2.4	OBJECT obj;
37	greg	1.1	register int i;
38			double coef;
39			OBJECT mod[2];
40	greg	2.2	register MFUNC *mf;
41	greg	1.1
42			if (m->oargs.nsargs < 4)
43			objerror(m, USER, "bad # arguments");
44	gwlarson	2.4	obj = objndx(m);
45	greg	1.1	for (i = 0; i < 2; i++)
46	greg	2.2	if (!strcmp(m->oargs.sarg[i], VOIDID))
47	greg	1.1	mod[i] = OVOID;
48	gwlarson	2.4	else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
49	greg	2.2	sprintf(errmsg, "undefined modifier \"%s\"",
50			m->oargs.sarg[i]);
51	greg	1.1	objerror(m, USER, errmsg);
52			}
53	greg	2.2	mf = getfunc(m, 3, 0x4, 0);
54			setfunc(m, r);
55	greg	1.1	errno = 0;
56	greg	2.2	coef = evalue(mf->ep[0]);
57	greg	1.1	if (errno) {
58			objerror(m, WARNING, "compute error");
59	greg	2.3	return(0);
60	greg	1.1	}
61	greg	2.3	if (raymixture(r, mod[0], mod[1], coef)) {
62			if (m->omod != OVOID)
63			objerror(m, USER, "inappropriate modifier");
64			return(1);
65			}
66			return(0);
67	greg	1.1	}