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