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) {
                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) {
                objerror(m, WARNING, "compute error");
                return(0);
        }
        multcolor(r->pcol, cval);
        return(0);
}
Revision:	2.5
Committed:	Tue Feb 25 02:47:23 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.4:	+1 -56 lines
Log Message:	Replaced inline copyright notice with #include "copyright.h"
#	Content
1	#ifndef lint
2	static const char RCSid[] = "$Id$";
3	#endif
4	/*
5	* p_func.c - routine for procedural patterns.
6	*/
7
8	#include "copyright.h"
9
10	#include "ray.h"
11
12	#include "func.h"
13
14	/*
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	OBJREC *m;
39	RAY *r;
40	{
41	double bval;
42	register MFUNC *mf;
43
44	if (m->oargs.nsargs < 2)
45	objerror(m, USER, "bad # arguments");
46	mf = getfunc(m, 1, 0x1, 0);
47	setfunc(m, r);
48	errno = 0;
49	bval = evalue(mf->ep[0]);
50	if (errno) {
51	objerror(m, WARNING, "compute error");
52	return(0);
53	}
54	scalecolor(r->pcol, bval);
55	return(0);
56	}
57
58
59	p_cfunc(m, r) /* compute color pattern */
60	OBJREC *m;
61	RAY *r;
62	{
63	COLOR cval;
64	register MFUNC *mf;
65
66	if (m->oargs.nsargs < 4)
67	objerror(m, USER, "bad # arguments");
68	mf = getfunc(m, 3, 0x7, 0);
69	setfunc(m, r);
70	errno = 0;
71	setcolor(cval, evalue(mf->ep[0]),
72	evalue(mf->ep[1]),
73	evalue(mf->ep[2]));
74	if (errno) {
75	objerror(m, WARNING, "compute error");
76	return(0);
77	}
78	multcolor(r->pcol, cval);
79	return(0);
80	}