src/rt/p_func.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  p_func.c - routine for procedural patterns.
 */

#include "copyright.h"

#include  "ray.h"

#include  "func.h"

/*
 *      A procedural pattern can either be a brightness or a
 *  color function.  A brightness function is given as:
 *
 *      modifier brightfunc name
 *      2+ bvarname filename xf
 *      0
 *      n A1 A2 ..
 *
 *  A color function is given as:
 *
 *      modifier colorfunc name
 *      4+ rvarname gvarname bvarname filename xf
 *      0
 *      n A1 A2 ..
 *
 *  Filename 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 xf is a transformation
 *  to get from the original coordinates to the current coordinates.
 */


p_bfunc(m, r)                   /* compute brightness pattern */
OBJREC  *m;
RAY  *r;
{
        double  bval;
        register MFUNC  *mf;

        if (m->oargs.nsargs < 2)
                objerror(m, USER, "bad # arguments");
        mf = getfunc(m, 1, 0x1, 0);
        setfunc(m, r);
        errno = 0;
        bval = evalue(mf->ep[0]);
        if (errno == EDOM || errno == ERANGE) {
                objerror(m, WARNING, "compute error");
                return(0);
        }
        scalecolor(r->pcol, bval);
        return(0);
}


p_cfunc(m, r)                   /* compute color pattern */
OBJREC  *m;
RAY  *r;
{
        COLOR  cval;
        register MFUNC  *mf;

        if (m->oargs.nsargs < 4)
                objerror(m, USER, "bad # arguments");
        mf = getfunc(m, 3, 0x7, 0);
        setfunc(m, r);
        errno = 0;
        setcolor(cval, evalue(mf->ep[0]),
                        evalue(mf->ep[1]),
                        evalue(mf->ep[2]));
        if (errno == EDOM || errno == ERANGE) {
                objerror(m, WARNING, "compute error");
                return(0);
        }
        multcolor(r->pcol, cval);
        return(0);
}
Revision:	2.6
Committed:	Wed Mar 5 16:16:53 2003 UTC (22 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R5
Changes since 2.5:	+2 -2 lines
Log Message:	Made errno checking explicit after math calls to avoid spurious warnings
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.4	static const char RCSid[] = "$Id$";
3	greg	1.1	#endif
4			/*
5			* p_func.c - routine for procedural patterns.
6	greg	2.4	*/
7
8	greg	2.5	#include "copyright.h"
9	greg	1.1
10			#include "ray.h"
11
12	greg	2.2	#include "func.h"
13
14	greg	1.1	/*
15			* A procedural pattern can either be a brightness or a
16			* color function. A brightness function is given as:
17			*
18			* modifier brightfunc name
19			* 2+ bvarname filename xf
20			* 0
21			* n A1 A2 ..
22			*
23			* A color function is given as:
24			*
25			* modifier colorfunc name
26			* 4+ rvarname gvarname bvarname filename xf
27			* 0
28			* n A1 A2 ..
29			*
30			* Filename is the name of the file where the variable definitions
31			* can be found. The list of real arguments can be accessed by
32			* definitions in the file. The xf is a transformation
33			* to get from the original coordinates to the current coordinates.
34			*/
35
36
37			p_bfunc(m, r) /* compute brightness pattern */
38	greg	2.2	OBJREC *m;
39	greg	1.1	RAY *r;
40			{
41			double bval;
42	greg	2.2	register MFUNC *mf;
43	greg	1.1
44			if (m->oargs.nsargs < 2)
45			objerror(m, USER, "bad # arguments");
46	greg	2.2	mf = getfunc(m, 1, 0x1, 0);
47			setfunc(m, r);
48	greg	1.1	errno = 0;
49	greg	2.2	bval = evalue(mf->ep[0]);
50	greg	2.6	if (errno == EDOM \|\| errno == ERANGE) {
51	greg	1.1	objerror(m, WARNING, "compute error");
52	greg	2.3	return(0);
53	greg	1.1	}
54			scalecolor(r->pcol, bval);
55	greg	2.3	return(0);
56	greg	1.1	}
57
58
59			p_cfunc(m, r) /* compute color pattern */
60	greg	2.2	OBJREC *m;
61	greg	1.1	RAY *r;
62			{
63			COLOR cval;
64	greg	2.2	register MFUNC *mf;
65	greg	1.1
66			if (m->oargs.nsargs < 4)
67			objerror(m, USER, "bad # arguments");
68	greg	2.2	mf = getfunc(m, 3, 0x7, 0);
69			setfunc(m, r);
70	greg	1.1	errno = 0;
71	greg	2.2	setcolor(cval, evalue(mf->ep[0]),
72			evalue(mf->ep[1]),
73			evalue(mf->ep[2]));
74	greg	2.6	if (errno == EDOM \|\| errno == ERANGE) {
75	greg	1.1	objerror(m, WARNING, "compute error");
76	greg	2.3	return(0);
77	greg	1.1	}
78			multcolor(r->pcol, cval);
79	greg	2.3	return(0);
80	greg	1.1	}