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 (32 years, 5 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
#	Content
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	funcfile(sa[1]);
54	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	funcfile(sa[3]);
80	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	}