src/rt/func.c

/* Copyright (c) 1991 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  func.c - interface to calcomp functions.
 *
 *     4/7/86
 */

#include  "ray.h"

#include  "otypes.h"


XF  unitxf = {                  /* identity transform */
        1.0, 0.0, 0.0, 0.0,
        0.0, 1.0, 0.0, 0.0,
        0.0, 0.0, 1.0, 0.0,
        0.0, 0.0, 0.0, 1.0,
        1.0
};

XF  funcxf;                     /* current transformation */
static OBJREC  *fobj = NULL;    /* current function object */
static RAY  *fray = NULL;       /* current function ray */


setmap(m, r, bx)                /* set channels for function call */
OBJREC  *m;
register RAY  *r;
XF  *bx;
{
        extern double  l_arg();
        extern long  eclock;
        static char  *initfile = "rayinit.cal";
        static long  lastrno = -1;
                                        /* check to see if already set */
        if (m == fobj && r->rno == lastrno)
                return(0);
                                        /* initialize if first call */
        if (initfile != NULL) {
                loadfunc(initfile);
                scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0);
                scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0);
                scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0);
                scompile("T=$10;Rdot=$11;", NULL, 0);
                scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0);
                scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0);
                scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0);
                scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0);
                funset("arg", 1, '=', l_arg);
                setnoisefuncs();
                initfile = NULL;
        }
        fobj = m;
        fray = r;
        if (r->rox != NULL)
                if (bx != &unitxf) {
                        funcxf.sca = r->rox->b.sca * bx->sca;
                        multmat4(funcxf.xfm, r->rox->b.xfm, bx->xfm);
                } else
                        copystruct(&funcxf, &r->rox->b);
        else
                copystruct(&funcxf, bx);
        lastrno = r->rno;
        eclock++;               /* notify expression evaluator */
        return(1);
}


setfunc(m, r)                           /* simplified interface to setmap */
register OBJREC  *m;
RAY  *r;
{
        register XF  *mxf;

        if ((mxf = (XF *)m->os) == NULL) {
                register int  n;
                register char  **sa;

                for (n = m->oargs.nsargs, sa = m->oargs.sarg;
                                n > 0 && **sa != '-'; n--, sa++)
                        ;
                if (n == 0)
                        mxf = &unitxf;
                else {
                        mxf = (XF *)malloc(sizeof(XF));
                        if (mxf == NULL)
                                goto memerr;
                        if (invxf(mxf, n, sa) != n)
                                objerror(m, USER, "bad transform");
                        if (mxf->sca < 0.0)
                                mxf->sca = -mxf->sca;
                }
                m->os = (char *)mxf;
        }
        return(setmap(m, r, mxf));
memerr:
        error(SYSTEM, "out of memory in setfunc");
}


loadfunc(fname)                 /* load definition file */
char  *fname;
{
        extern char  *libpath;          /* library search path */
        char  *ffname;

        if ((ffname = getpath(fname, libpath, R_OK)) == NULL) {
                sprintf(errmsg, "cannot find function file \"%s\"", fname);
                error(USER, errmsg);
        }
        fcompile(ffname);
}


double
l_arg()                         /* return nth real argument */
{
        extern double  argument();
        register int  n;

        n = argument(1) + .5;           /* round to integer */

        if (n < 1)
                return(fobj->oargs.nfargs);

        if (n > fobj->oargs.nfargs) {
                sprintf(errmsg, "missing real argument %d", n);
                objerror(fobj, USER, errmsg);
        }
        return(fobj->oargs.farg[n-1]);
}


double
chanvalue(n)                    /* return channel n to calcomp */
register int  n;
{
        double  sum;
        register RAY  *r;

        if (--n < 0)
                goto badchan;

        if (n < 3)                      /* ray direction */

                return( (       fray->rdir[0]*funcxf.xfm[0][n] +
                                fray->rdir[1]*funcxf.xfm[1][n] +
                                fray->rdir[2]*funcxf.xfm[2][n]  )
                         / funcxf.sca );

        if (n < 6)                      /* surface normal */

                return( (       fray->ron[0]*funcxf.xfm[0][n-3] +
                                fray->ron[1]*funcxf.xfm[1][n-3] +
                                fray->ron[2]*funcxf.xfm[2][n-3] )
                         / funcxf.sca );

        if (n < 9)                      /* intersection */

                return( fray->rop[0]*funcxf.xfm[0][n-6] +
                                fray->rop[1]*funcxf.xfm[1][n-6] +
                                fray->rop[2]*funcxf.xfm[2][n-6] +
                                             funcxf.xfm[3][n-6] );

        if (n == 9) {                   /* distance */

                sum = fray->rot;
                for (r = fray->parent; r != NULL; r = r->parent)
                        sum += r->rot;
                return(sum * funcxf.sca);

        }
        if (n == 10)                    /* dot product */
                return(fray->rod);

        if (n == 11)                    /* scale */
                return(funcxf.sca);

        if (n < 15)                     /* origin */
                return(funcxf.xfm[3][n-12]);

        if (n < 18)                     /* i unit vector */
                return(funcxf.xfm[0][n-15] / funcxf.sca);

        if (n < 21)                     /* j unit vector */
                return(funcxf.xfm[1][n-15] / funcxf.sca);

        if (n < 24)                     /* k unit vector */
                return(funcxf.xfm[2][n-21] / funcxf.sca);
badchan:
        error(USER, "illegal channel number");
}
Revision:	1.17
Committed:	Mon Jun 17 08:51:33 1991 UTC (32 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.16:	+3 -3 lines
Log Message:	added return value to setfunc() and setmap(): returns 1 if setting was made, 0 if function already set
#	User	Rev	Content
1	greg	1.13	/* 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			* func.c - interface to calcomp functions.
9			*
10			* 4/7/86
11			*/
12
13			#include "ray.h"
14
15			#include "otypes.h"
16
17
18	greg	1.13	XF unitxf = { /* identity transform */
19			1.0, 0.0, 0.0, 0.0,
20			0.0, 1.0, 0.0, 0.0,
21			0.0, 0.0, 1.0, 0.0,
22			0.0, 0.0, 0.0, 1.0,
23			1.0
24			};
25
26	greg	1.12	XF funcxf; /* current transformation */
27			static OBJREC fobj = NULL; / current function object */
28			static RAY fray = NULL; / current function ray */
29	greg	1.1
30
31	greg	1.12	setmap(m, r, bx) /* set channels for function call */
32	greg	1.1	OBJREC *m;
33			register RAY *r;
34	greg	1.12	XF *bx;
35	greg	1.1	{
36	greg	1.15	extern double l_arg();
37	greg	1.1	extern long eclock;
38			static char *initfile = "rayinit.cal";
39	greg	1.16	static long lastrno = -1;
40			/* check to see if already set */
41			if (m == fobj && r->rno == lastrno)
42	greg	1.17	return(0);
43	greg	1.12	/* initialize if first call */
44	greg	1.1	if (initfile != NULL) {
45			loadfunc(initfile);
46	greg	1.9	scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0);
47			scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0);
48			scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0);
49			scompile("T=$10;Rdot=$11;", NULL, 0);
50			scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0);
51			scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0);
52			scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0);
53			scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0);
54	greg	1.14	funset("arg", 1, '=', l_arg);
55	greg	1.15	setnoisefuncs();
56	greg	1.1	initfile = NULL;
57			}
58			fobj = m;
59			fray = r;
60	greg	1.13	if (r->rox != NULL)
61			if (bx != &unitxf) {
62			funcxf.sca = r->rox->b.sca * bx->sca;
63			multmat4(funcxf.xfm, r->rox->b.xfm, bx->xfm);
64			} else
65			copystruct(&funcxf, &r->rox->b);
66			else
67	greg	1.12	copystruct(&funcxf, bx);
68	greg	1.16	lastrno = r->rno;
69	greg	1.1	eclock++; /* notify expression evaluator */
70	greg	1.17	return(1);
71	greg	1.1	}
72
73
74			setfunc(m, r) /* simplified interface to setmap */
75			register OBJREC *m;
76			RAY *r;
77			{
78	greg	1.2	register XF *mxf;
79	greg	1.1
80	greg	1.2	if ((mxf = (XF *)m->os) == NULL) {
81	greg	1.5	register int n;
82			register char **sa;
83	greg	1.1
84	greg	1.5	for (n = m->oargs.nsargs, sa = m->oargs.sarg;
85			n > 0 && **sa != '-'; n--, sa++)
86			;
87	greg	1.13	if (n == 0)
88			mxf = &unitxf;
89			else {
90			mxf = (XF *)malloc(sizeof(XF));
91			if (mxf == NULL)
92			goto memerr;
93			if (invxf(mxf, n, sa) != n)
94			objerror(m, USER, "bad transform");
95			if (mxf->sca < 0.0)
96			mxf->sca = -mxf->sca;
97			}
98	greg	1.2	m->os = (char *)mxf;
99	greg	1.1	}
100	greg	1.17	return(setmap(m, r, mxf));
101	greg	1.1	memerr:
102			error(SYSTEM, "out of memory in setfunc");
103			}
104
105
106			loadfunc(fname) /* load definition file */
107			char *fname;
108			{
109			extern char libpath; / library search path */
110			char *ffname;
111
112	greg	1.6	if ((ffname = getpath(fname, libpath, R_OK)) == NULL) {
113	greg	1.1	sprintf(errmsg, "cannot find function file \"%s\"", fname);
114			error(USER, errmsg);
115			}
116			fcompile(ffname);
117			}
118
119
120			double
121			l_arg() /* return nth real argument */
122			{
123			extern double argument();
124			register int n;
125
126			n = argument(1) + .5; /* round to integer */
127
128			if (n < 1)
129			return(fobj->oargs.nfargs);
130
131			if (n > fobj->oargs.nfargs) {
132			sprintf(errmsg, "missing real argument %d", n);
133			objerror(fobj, USER, errmsg);
134			}
135			return(fobj->oargs.farg[n-1]);
136			}
137
138
139			double
140			chanvalue(n) /* return channel n to calcomp */
141			register int n;
142			{
143	greg	1.8	double sum;
144	greg	1.1	register RAY *r;
145
146	greg	1.10	if (--n < 0)
147			goto badchan;
148	greg	1.1
149	greg	1.8	if (n < 3) /* ray direction */
150	greg	1.1
151	greg	1.12	return( ( fray->rdir[0]*funcxf.xfm[0][n] +
152			fray->rdir[1]*funcxf.xfm[1][n] +
153			fray->rdir[2]*funcxf.xfm[2][n] )
154			/ funcxf.sca );
155	greg	1.1
156	greg	1.8	if (n < 6) /* surface normal */
157
158	greg	1.12	return( ( fray->ron[0]*funcxf.xfm[0][n-3] +
159			fray->ron[1]*funcxf.xfm[1][n-3] +
160			fray->ron[2]*funcxf.xfm[2][n-3] )
161			/ funcxf.sca );
162	greg	1.8
163			if (n < 9) /* intersection */
164
165	greg	1.12	return( fray->rop[0]*funcxf.xfm[0][n-6] +
166			fray->rop[1]*funcxf.xfm[1][n-6] +
167			fray->rop[2]*funcxf.xfm[2][n-6] +
168			funcxf.xfm[3][n-6] );
169	greg	1.8
170	greg	1.10	if (n == 9) { /* distance */
171
172			sum = fray->rot;
173			for (r = fray->parent; r != NULL; r = r->parent)
174			sum += r->rot;
175	greg	1.12	return(sum * funcxf.sca);
176	greg	1.10
177			}
178			if (n == 10) /* dot product */
179			return(fray->rod);
180
181	greg	1.8	if (n == 11) /* scale */
182	greg	1.12	return(funcxf.sca);
183	greg	1.8
184			if (n < 15) /* origin */
185	greg	1.12	return(funcxf.xfm[3][n-12]);
186	greg	1.8
187			if (n < 18) /* i unit vector */
188	greg	1.12	return(funcxf.xfm[0][n-15] / funcxf.sca);
189	greg	1.8
190			if (n < 21) /* j unit vector */
191	greg	1.12	return(funcxf.xfm[1][n-15] / funcxf.sca);
192	greg	1.8
193			if (n < 24) /* k unit vector */
194	greg	1.12	return(funcxf.xfm[2][n-21] / funcxf.sca);
195	greg	1.10	badchan:
196			error(USER, "illegal channel number");
197	greg	1.1	}