src/rt/p_func.c

#ifndef lint
static const char       RCSid[] = "$Id: p_func.c,v 2.6 2003/03/05 16:16:53 greg Exp $";
#endif
/*
 *  p_func.c - routine for procedural patterns.
 */

#include "copyright.h"

#include  "ray.h"
#include  "func.h"
#include  "rtotypes.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.
 */


extern int
p_bfunc(                        /* 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 == EDOM || errno == ERANGE) {
                objerror(m, WARNING, "compute error");
                return(0);
        }
        scalecolor(r->pcol, bval);
        return(0);
}


extern int
p_cfunc(                        /* 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 == EDOM || errno == ERANGE) {
                objerror(m, WARNING, "compute error");
                return(0);
        }
        multcolor(r->pcol, cval);
        return(0);
}
Revision:	2.7
Committed:	Tue Mar 30 16:13:01 2004 UTC (20 years, 1 month ago) by schorsch
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R7P2, rad3R7P1, rad4R1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9
Changes since 2.6:	+12 -8 lines
Log Message:	Continued ANSIfication. There are only bits and pieces left now.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	schorsch	2.7	static const char RCSid[] = "$Id: p_func.c,v 2.6 2003/03/05 16:16:53 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* p_func.c - routine for procedural patterns.
6	greg	2.4	*/
7
8	greg	2.5	#include "copyright.h"
9	greg	1.1
10			#include "ray.h"
11	greg	2.2	#include "func.h"
12	schorsch	2.7	#include "rtotypes.h"
13	greg	2.2
14	greg	1.1	/*
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	schorsch	2.7	extern int
38			p_bfunc( /* compute brightness pattern */
39			OBJREC *m,
40			RAY *r
41			)
42	greg	1.1	{
43			double bval;
44	greg	2.2	register MFUNC *mf;
45	greg	1.1
46			if (m->oargs.nsargs < 2)
47			objerror(m, USER, "bad # arguments");
48	greg	2.2	mf = getfunc(m, 1, 0x1, 0);
49			setfunc(m, r);
50	greg	1.1	errno = 0;
51	greg	2.2	bval = evalue(mf->ep[0]);
52	greg	2.6	if (errno == EDOM \|\| errno == ERANGE) {
53	greg	1.1	objerror(m, WARNING, "compute error");
54	greg	2.3	return(0);
55	greg	1.1	}
56			scalecolor(r->pcol, bval);
57	greg	2.3	return(0);
58	greg	1.1	}
59
60
61	schorsch	2.7	extern int
62			p_cfunc( /* compute color pattern */
63			OBJREC *m,
64			RAY *r
65			)
66	greg	1.1	{
67			COLOR cval;
68	greg	2.2	register MFUNC *mf;
69	greg	1.1
70			if (m->oargs.nsargs < 4)
71			objerror(m, USER, "bad # arguments");
72	greg	2.2	mf = getfunc(m, 3, 0x7, 0);
73			setfunc(m, r);
74	greg	1.1	errno = 0;
75	greg	2.2	setcolor(cval, evalue(mf->ep[0]),
76			evalue(mf->ep[1]),
77			evalue(mf->ep[2]));
78	greg	2.6	if (errno == EDOM \|\| errno == ERANGE) {
79	greg	1.1	objerror(m, WARNING, "compute error");
80	greg	2.3	return(0);
81	greg	1.1	}
82			multcolor(r->pcol, cval);
83	greg	2.3	return(0);
84	greg	1.1	}