src/rt/p_func.c

/* Copyright (c) 1991 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"

#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:	2.3
Committed:	Wed Jan 12 16:46:50 1994 UTC (30 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.2:	+4 -2 lines
Log Message:	made mixtures work with materials
#	Content
1	/* Copyright (c) 1991 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	#include "func.h"
16
17	/*
18	* A procedural pattern can either be a brightness or a
19	* color function. A brightness function is given as:
20	*
21	* modifier brightfunc name
22	* 2+ bvarname filename xf
23	* 0
24	* n A1 A2 ..
25	*
26	* A color function is given as:
27	*
28	* modifier colorfunc name
29	* 4+ rvarname gvarname bvarname filename xf
30	* 0
31	* n A1 A2 ..
32	*
33	* Filename is the name of the file where the variable definitions
34	* can be found. The list of real arguments can be accessed by
35	* definitions in the file. The xf is a transformation
36	* to get from the original coordinates to the current coordinates.
37	*/
38
39
40	p_bfunc(m, r) /* compute brightness pattern */
41	OBJREC *m;
42	RAY *r;
43	{
44	double bval;
45	register MFUNC *mf;
46
47	if (m->oargs.nsargs < 2)
48	objerror(m, USER, "bad # arguments");
49	mf = getfunc(m, 1, 0x1, 0);
50	setfunc(m, r);
51	errno = 0;
52	bval = evalue(mf->ep[0]);
53	if (errno) {
54	objerror(m, WARNING, "compute error");
55	return(0);
56	}
57	scalecolor(r->pcol, bval);
58	return(0);
59	}
60
61
62	p_cfunc(m, r) /* compute color pattern */
63	OBJREC *m;
64	RAY *r;
65	{
66	COLOR cval;
67	register MFUNC *mf;
68
69	if (m->oargs.nsargs < 4)
70	objerror(m, USER, "bad # arguments");
71	mf = getfunc(m, 3, 0x7, 0);
72	setfunc(m, r);
73	errno = 0;
74	setcolor(cval, evalue(mf->ep[0]),
75	evalue(mf->ep[1]),
76	evalue(mf->ep[2]));
77	if (errno) {
78	objerror(m, WARNING, "compute error");
79	return(0);
80	}
81	multcolor(r->pcol, cval);
82	return(0);
83	}