src/rt/p_func.c

/* Copyright (c) 1986 Regents of the University of California */

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

/*
 *  p_func.c - routine for procedural patterns.
 *
 *     4/8/86
 */

#include  "ray.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 */
register OBJREC  *m;
RAY  *r;
{
        extern double  varvalue();
        extern int  errno;
        double  bval;
        register char  **sa;

        setfunc(m, r);

        sa = m->oargs.sarg;

        if (m->oargs.nsargs < 2)
                objerror(m, USER, "bad # arguments");
        funcfile(sa[1]);
        errno = 0;
        bval = varvalue(sa[0]);
        if (errno) {
                objerror(m, WARNING, "compute error");
                return;
        }
        scalecolor(r->pcol, bval);
}


p_cfunc(m, r)                   /* compute color pattern */
register OBJREC  *m;
RAY  *r;
{
        extern double  varvalue();
        extern int  errno;
        COLOR  cval;
        register char  **sa;

        setfunc(m, r);

        sa = m->oargs.sarg;

        if (m->oargs.nsargs < 4)
                objerror(m, USER, "bad # arguments");
        funcfile(sa[3]);
        errno = 0;
        setcolor(cval, varvalue(sa[0]),
                        varvalue(sa[1]),
                        varvalue(sa[2]));
        if (errno) {
                objerror(m, WARNING, "compute error");
                return;
        }
        multcolor(r->pcol, cval);
}
Revision:	2.1
Committed:	Tue Nov 12 17:08:40 1991 UTC (33 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+0 -0 lines
Log Message:	updated revision number for release 2.0
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1986 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* p_func.c - routine for procedural patterns.
9			*
10			* 4/8/86
11			*/
12
13			#include "ray.h"
14
15			/*
16			* A procedural pattern can either be a brightness or a
17			* color function. A brightness function is given as:
18			*
19			* modifier brightfunc name
20			* 2+ bvarname filename xf
21			* 0
22			* n A1 A2 ..
23			*
24			* A color function is given as:
25			*
26			* modifier colorfunc name
27			* 4+ rvarname gvarname bvarname filename xf
28			* 0
29			* n A1 A2 ..
30			*
31			* Filename is the name of the file where the variable definitions
32			* can be found. The list of real arguments can be accessed by
33			* definitions in the file. The xf is a transformation
34			* to get from the original coordinates to the current coordinates.
35			*/
36
37
38			p_bfunc(m, r) /* compute brightness pattern */
39			register OBJREC *m;
40			RAY *r;
41			{
42			extern double varvalue();
43			extern int errno;
44			double bval;
45			register char **sa;
46
47			setfunc(m, r);
48
49			sa = m->oargs.sarg;
50
51			if (m->oargs.nsargs < 2)
52			objerror(m, USER, "bad # arguments");
53	greg	1.2	funcfile(sa[1]);
54	greg	1.1	errno = 0;
55			bval = varvalue(sa[0]);
56			if (errno) {
57			objerror(m, WARNING, "compute error");
58			return;
59			}
60			scalecolor(r->pcol, bval);
61			}
62
63
64			p_cfunc(m, r) /* compute color pattern */
65			register OBJREC *m;
66			RAY *r;
67			{
68			extern double varvalue();
69			extern int errno;
70			COLOR cval;
71			register char **sa;
72
73			setfunc(m, r);
74
75			sa = m->oargs.sarg;
76
77			if (m->oargs.nsargs < 4)
78			objerror(m, USER, "bad # arguments");
79	greg	1.2	funcfile(sa[3]);
80	greg	1.1	errno = 0;
81			setcolor(cval, varvalue(sa[0]),
82			varvalue(sa[1]),
83			varvalue(sa[2]));
84			if (errno) {
85			objerror(m, WARNING, "compute error");
86			return;
87			}
88			multcolor(r->pcol, cval);
89			}