src/rt/func.c

/* Copyright (c) 1990 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  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";
        static long  lastrno = -1;
                                        /* check to see if already set */
        if (m == fobj && r->rno == lastrno)
                return;
                                        /* 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;
        lastrno = r->rno;
        if (r->rox != NULL) {
                funcxf.sca = r->rox->b.sca * bx->sca;
                multmat4(funcxf.xfm, r->rox->b.xfm, bx->xfm);
        } 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++)
                        ;
                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:	1.12
Committed:	Sat Dec 15 15:03:26 1990 UTC (34 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.11:	+37 -35 lines
Log Message:	changed handling of matrix transformations with new MAT4 & XF types dynamic allocation of ray transformations with newrayxf() added missing light source vector transformation to m_brdf.c
#	User	Rev	Content
1	greg	1.12	/* Copyright (c) 1990 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	1.12	XF funcxf; /* current transformation */
19			static OBJREC fobj = NULL; / current function object */
20			static RAY fray = NULL; / current function ray */
21	greg	1.1
22
23	greg	1.12	setmap(m, r, bx) /* set channels for function call */
24	greg	1.1	OBJREC *m;
25			register RAY *r;
26	greg	1.12	XF *bx;
27	greg	1.1	{
28			extern double l_noise3(), l_noise3a(), l_noise3b(), l_noise3c();
29			extern double l_hermite(), l_fnoise3(), l_arg();
30			extern long eclock;
31			static char *initfile = "rayinit.cal";
32	greg	1.12	static long lastrno = -1;
33			/* check to see if already set */
34			if (m == fobj && r->rno == lastrno)
35			return;
36			/* initialize if first call */
37	greg	1.1	if (initfile != NULL) {
38			loadfunc(initfile);
39	greg	1.9	scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0);
40			scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0);
41			scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0);
42			scompile("T=$10;Rdot=$11;", NULL, 0);
43			scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0);
44			scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0);
45			scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0);
46			scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0);
47	greg	1.1	funset("arg", 1, l_arg);
48			funset("noise3", 3, l_noise3);
49			funset("noise3a", 3, l_noise3a);
50			funset("noise3b", 3, l_noise3b);
51			funset("noise3c", 3, l_noise3c);
52			funset("hermite", 5, l_hermite);
53			funset("fnoise3", 3, l_fnoise3);
54			initfile = NULL;
55			}
56			fobj = m;
57			fray = r;
58	greg	1.12	lastrno = r->rno;
59			if (r->rox != NULL) {
60			funcxf.sca = r->rox->b.sca * bx->sca;
61			multmat4(funcxf.xfm, r->rox->b.xfm, bx->xfm);
62			} else
63			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	1.1	mxf = (XF *)malloc(sizeof(XF));
82			if (mxf == NULL)
83			goto memerr;
84	greg	1.12	if (invxf(mxf, n, sa) != n)
85	greg	1.1	objerror(m, USER, "bad transform");
86			if (mxf->sca < 0.0)
87			mxf->sca = -mxf->sca;
88	greg	1.2	m->os = (char *)mxf;
89	greg	1.1	}
90	greg	1.12	setmap(m, r, mxf);
91	greg	1.1	return;
92			memerr:
93			error(SYSTEM, "out of memory in setfunc");
94			}
95
96
97			loadfunc(fname) /* load definition file */
98			char *fname;
99			{
100			extern char libpath; / library search path */
101			char *ffname;
102
103	greg	1.6	if ((ffname = getpath(fname, libpath, R_OK)) == NULL) {
104	greg	1.1	sprintf(errmsg, "cannot find function file \"%s\"", fname);
105			error(USER, errmsg);
106			}
107			fcompile(ffname);
108			}
109
110
111			double
112			l_arg() /* return nth real argument */
113			{
114			extern double argument();
115			register int n;
116
117			n = argument(1) + .5; /* round to integer */
118
119			if (n < 1)
120			return(fobj->oargs.nfargs);
121
122			if (n > fobj->oargs.nfargs) {
123			sprintf(errmsg, "missing real argument %d", n);
124			objerror(fobj, USER, errmsg);
125			}
126			return(fobj->oargs.farg[n-1]);
127			}
128
129
130			double
131			chanvalue(n) /* return channel n to calcomp */
132			register int n;
133			{
134	greg	1.8	double sum;
135	greg	1.1	register RAY *r;
136
137	greg	1.10	if (--n < 0)
138			goto badchan;
139	greg	1.1
140	greg	1.8	if (n < 3) /* ray direction */
141	greg	1.1
142	greg	1.12	return( ( fray->rdir[0]*funcxf.xfm[0][n] +
143			fray->rdir[1]*funcxf.xfm[1][n] +
144			fray->rdir[2]*funcxf.xfm[2][n] )
145			/ funcxf.sca );
146	greg	1.1
147	greg	1.8	if (n < 6) /* surface normal */
148
149	greg	1.12	return( ( fray->ron[0]*funcxf.xfm[0][n-3] +
150			fray->ron[1]*funcxf.xfm[1][n-3] +
151			fray->ron[2]*funcxf.xfm[2][n-3] )
152			/ funcxf.sca );
153	greg	1.8
154			if (n < 9) /* intersection */
155
156	greg	1.12	return( fray->rop[0]*funcxf.xfm[0][n-6] +
157			fray->rop[1]*funcxf.xfm[1][n-6] +
158			fray->rop[2]*funcxf.xfm[2][n-6] +
159			funcxf.xfm[3][n-6] );
160	greg	1.8
161	greg	1.10	if (n == 9) { /* distance */
162
163			sum = fray->rot;
164			for (r = fray->parent; r != NULL; r = r->parent)
165			sum += r->rot;
166	greg	1.12	return(sum * funcxf.sca);
167	greg	1.10
168			}
169			if (n == 10) /* dot product */
170			return(fray->rod);
171
172	greg	1.8	if (n == 11) /* scale */
173	greg	1.12	return(funcxf.sca);
174	greg	1.8
175			if (n < 15) /* origin */
176	greg	1.12	return(funcxf.xfm[3][n-12]);
177	greg	1.8
178			if (n < 18) /* i unit vector */
179	greg	1.12	return(funcxf.xfm[0][n-15] / funcxf.sca);
180	greg	1.8
181			if (n < 21) /* j unit vector */
182	greg	1.12	return(funcxf.xfm[1][n-15] / funcxf.sca);
183	greg	1.8
184			if (n < 24) /* k unit vector */
185	greg	1.12	return(funcxf.xfm[2][n-21] / funcxf.sca);
186	greg	1.10	badchan:
187			error(USER, "illegal channel number");
188	greg	1.1	}