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
#	User	Rev	Content
1	greg	2.2	/* Copyright (c) 1991 Regents of the University of California */
2	greg	1.1
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	greg	2.2	#include "func.h"
16
17	greg	1.1	/*
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	greg	2.2	OBJREC *m;
42	greg	1.1	RAY *r;
43			{
44			double bval;
45	greg	2.2	register MFUNC *mf;
46	greg	1.1
47			if (m->oargs.nsargs < 2)
48			objerror(m, USER, "bad # arguments");
49	greg	2.2	mf = getfunc(m, 1, 0x1, 0);
50			setfunc(m, r);
51	greg	1.1	errno = 0;
52	greg	2.2	bval = evalue(mf->ep[0]);
53	greg	1.1	if (errno) {
54			objerror(m, WARNING, "compute error");
55	greg	2.3	return(0);
56	greg	1.1	}
57			scalecolor(r->pcol, bval);
58	greg	2.3	return(0);
59	greg	1.1	}
60
61
62			p_cfunc(m, r) /* compute color pattern */
63	greg	2.2	OBJREC *m;
64	greg	1.1	RAY *r;
65			{
66			COLOR cval;
67	greg	2.2	register MFUNC *mf;
68	greg	1.1
69			if (m->oargs.nsargs < 4)
70			objerror(m, USER, "bad # arguments");
71	greg	2.2	mf = getfunc(m, 3, 0x7, 0);
72			setfunc(m, r);
73	greg	1.1	errno = 0;
74	greg	2.2	setcolor(cval, evalue(mf->ep[0]),
75			evalue(mf->ep[1]),
76			evalue(mf->ep[2]));
77	greg	1.1	if (errno) {
78			objerror(m, WARNING, "compute error");
79	greg	2.3	return(0);
80	greg	1.1	}
81			multcolor(r->pcol, cval);
82	greg	2.3	return(0);
83	greg	1.1	}