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_noise3(), l_noise3a(), l_noise3b(), l_noise3c();
        extern double  l_hermite(), l_fnoise3(), l_arg();
        extern long  eclock;
        static char  *initfile = "rayinit.cal";
                                        /* 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);
                funset("noise3", 3, l_noise3);
                funset("noise3a", 3, l_noise3a);
                funset("noise3b", 3, l_noise3b);
                funset("noise3c", 3, l_noise3c);
                funset("hermite", 5, l_hermite);
                funset("fnoise3", 3, l_fnoise3);
                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);
        eclock++;               /* notify expression evaluator */
}


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;
        }
        setmap(m, r, mxf);
        return;
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:	1.13
Committed:	Sat Jan 12 18:01:19 1991 UTC (34 years, 9 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.12:	+27 -17 lines
Log Message:	fixed incorrect test for repeat call added identity transform special case
#	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			extern double l_noise3(), l_noise3a(), l_noise3b(), l_noise3c();
37			extern double l_hermite(), l_fnoise3(), l_arg();
38			extern long eclock;
39			static char *initfile = "rayinit.cal";
40	greg	1.12	/* initialize if first call */
41	greg	1.1	if (initfile != NULL) {
42			loadfunc(initfile);
43	greg	1.9	scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0);
44			scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0);
45			scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0);
46			scompile("T=$10;Rdot=$11;", NULL, 0);
47			scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0);
48			scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0);
49			scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0);
50			scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0);
51	greg	1.1	funset("arg", 1, l_arg);
52			funset("noise3", 3, l_noise3);
53			funset("noise3a", 3, l_noise3a);
54			funset("noise3b", 3, l_noise3b);
55			funset("noise3c", 3, l_noise3c);
56			funset("hermite", 5, l_hermite);
57			funset("fnoise3", 3, l_fnoise3);
58			initfile = NULL;
59			}
60			fobj = m;
61			fray = r;
62	greg	1.13	if (r->rox != NULL)
63			if (bx != &unitxf) {
64			funcxf.sca = r->rox->b.sca * bx->sca;
65			multmat4(funcxf.xfm, r->rox->b.xfm, bx->xfm);
66			} else
67			copystruct(&funcxf, &r->rox->b);
68			else
69	greg	1.12	copystruct(&funcxf, bx);
70	greg	1.1	eclock++; /* notify expression evaluator */
71			}
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	1.12	setmap(m, r, mxf);
101	greg	1.1	return;
102			memerr:
103			error(SYSTEM, "out of memory in setfunc");
104			}
105
106
107			loadfunc(fname) /* load definition file */
108			char *fname;
109			{
110			extern char libpath; / library search path */
111			char *ffname;
112
113	greg	1.6	if ((ffname = getpath(fname, libpath, R_OK)) == NULL) {
114	greg	1.1	sprintf(errmsg, "cannot find function file \"%s\"", fname);
115			error(USER, errmsg);
116			}
117			fcompile(ffname);
118			}
119
120
121			double
122			l_arg() /* return nth real argument */
123			{
124			extern double argument();
125			register int n;
126
127			n = argument(1) + .5; /* round to integer */
128
129			if (n < 1)
130			return(fobj->oargs.nfargs);
131
132			if (n > fobj->oargs.nfargs) {
133			sprintf(errmsg, "missing real argument %d", n);
134			objerror(fobj, USER, errmsg);
135			}
136			return(fobj->oargs.farg[n-1]);
137			}
138
139
140			double
141			chanvalue(n) /* return channel n to calcomp */
142			register int n;
143			{
144	greg	1.8	double sum;
145	greg	1.1	register RAY *r;
146
147	greg	1.10	if (--n < 0)
148			goto badchan;
149	greg	1.1
150	greg	1.8	if (n < 3) /* ray direction */
151	greg	1.1
152	greg	1.12	return( ( fray->rdir[0]*funcxf.xfm[0][n] +
153			fray->rdir[1]*funcxf.xfm[1][n] +
154			fray->rdir[2]*funcxf.xfm[2][n] )
155			/ funcxf.sca );
156	greg	1.1
157	greg	1.8	if (n < 6) /* surface normal */
158
159	greg	1.12	return( ( fray->ron[0]*funcxf.xfm[0][n-3] +
160			fray->ron[1]*funcxf.xfm[1][n-3] +
161			fray->ron[2]*funcxf.xfm[2][n-3] )
162			/ funcxf.sca );
163	greg	1.8
164			if (n < 9) /* intersection */
165
166	greg	1.12	return( fray->rop[0]*funcxf.xfm[0][n-6] +
167			fray->rop[1]*funcxf.xfm[1][n-6] +
168			fray->rop[2]*funcxf.xfm[2][n-6] +
169			funcxf.xfm[3][n-6] );
170	greg	1.8
171	greg	1.10	if (n == 9) { /* distance */
172
173			sum = fray->rot;
174			for (r = fray->parent; r != NULL; r = r->parent)
175			sum += r->rot;
176	greg	1.12	return(sum * funcxf.sca);
177	greg	1.10
178			}
179			if (n == 10) /* dot product */
180			return(fray->rod);
181
182	greg	1.8	if (n == 11) /* scale */
183	greg	1.12	return(funcxf.sca);
184	greg	1.8
185			if (n < 15) /* origin */
186	greg	1.12	return(funcxf.xfm[3][n-12]);
187	greg	1.8
188			if (n < 18) /* i unit vector */
189	greg	1.12	return(funcxf.xfm[0][n-15] / funcxf.sca);
190	greg	1.8
191			if (n < 21) /* j unit vector */
192	greg	1.12	return(funcxf.xfm[1][n-15] / funcxf.sca);
193	greg	1.8
194			if (n < 24) /* k unit vector */
195	greg	1.12	return(funcxf.xfm[2][n-21] / funcxf.sca);
196	greg	1.10	badchan:
197			error(USER, "illegal channel number");
198	greg	1.1	}