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greg |
1.1 |
/* Copyright (c) 1986 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* func.c - interface to calcomp functions.
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*
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* 4/7/86
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*/
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#include "ray.h"
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#include "otypes.h"
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typedef struct {
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greg |
1.3 |
double xfm[4][4]; /* transform matrix */
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greg |
1.1 |
double sca; /* scalefactor */
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} XF;
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static OBJREC *fobj; /* current function object */
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static RAY *fray; /* current function ray */
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static XF fxf; /* current transformation */
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greg |
1.3 |
setmap(m, r, xfm, sca) /* set channels for function call */
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greg |
1.1 |
OBJREC *m;
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register RAY *r;
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greg |
1.3 |
double xfm[4][4];
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greg |
1.1 |
double sca;
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{
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extern double l_noise3(), l_noise3a(), l_noise3b(), l_noise3c();
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extern double l_hermite(), l_fnoise3(), l_arg();
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extern long eclock;
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static char *initfile = "rayinit.cal";
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if (initfile != NULL) {
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loadfunc(initfile);
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scompile(NULL, "Dx=$1;Dy=$2;Dz=$3;");
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scompile(NULL, "Nx=$4;Ny=$5;Nz=$6;");
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scompile(NULL, "Px=$7;Py=$8;Pz=$9;");
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scompile(NULL, "T=$10;Rdot=$11;");
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funset("arg", 1, l_arg);
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funset("noise3", 3, l_noise3);
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funset("noise3a", 3, l_noise3a);
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funset("noise3b", 3, l_noise3b);
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funset("noise3c", 3, l_noise3c);
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funset("hermite", 5, l_hermite);
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funset("fnoise3", 3, l_fnoise3);
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initfile = NULL;
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}
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fobj = m;
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fray = r;
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fxf.sca = r->ros * sca;
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multmat4(fxf.xfm, r->rox, xfm);
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eclock++; /* notify expression evaluator */
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}
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setfunc(m, r) /* simplified interface to setmap */
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register OBJREC *m;
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RAY *r;
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{
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greg |
1.2 |
register XF *mxf;
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greg |
1.1 |
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greg |
1.2 |
if ((mxf = (XF *)m->os) == NULL) {
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greg |
1.1 |
register int n = m->oargs.nsargs;
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register char **sa = m->oargs.sarg;
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while (n > 0 && **sa != '-') {
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n--;
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sa++;
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}
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mxf = (XF *)malloc(sizeof(XF));
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if (mxf == NULL)
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goto memerr;
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mxf->sca = 1.0;
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setident4(mxf->xfm);
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if (invxf(mxf->xfm, &mxf->sca, n, sa) != n)
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objerror(m, USER, "bad transform");
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if (mxf->sca < 0.0)
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mxf->sca = -mxf->sca;
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greg |
1.2 |
m->os = (char *)mxf;
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greg |
1.1 |
}
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greg |
1.3 |
setmap(m, r, mxf->xfm, mxf->sca);
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greg |
1.1 |
return;
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memerr:
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error(SYSTEM, "out of memory in setfunc");
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#undef mxf
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}
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loadfunc(fname) /* load definition file */
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char *fname;
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{
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extern char *libpath; /* library search path */
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char *ffname;
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if ((ffname = getpath(fname, libpath)) == NULL) {
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sprintf(errmsg, "cannot find function file \"%s\"", fname);
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error(USER, errmsg);
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}
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fcompile(ffname);
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}
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double
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l_arg() /* return nth real argument */
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{
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extern double argument();
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register int n;
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n = argument(1) + .5; /* round to integer */
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if (n < 1)
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return(fobj->oargs.nfargs);
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if (n > fobj->oargs.nfargs) {
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sprintf(errmsg, "missing real argument %d", n);
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objerror(fobj, USER, errmsg);
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}
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return(fobj->oargs.farg[n-1]);
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}
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double
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chanvalue(n) /* return channel n to calcomp */
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register int n;
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{
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double res;
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register RAY *r;
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n--; /* for convenience */
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if (n < 0 || n > 10)
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error(USER, "illegal channel number");
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if (n == 9) { /* distance */
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res = fray->rot;
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for (r = fray->parent; r != NULL; r = r->parent)
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res += r->rot;
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res *= fxf.sca;
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} else if (n == 10) { /* dot product */
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res = fray->rod;
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} else if (n < 3) { /* ray direction */
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res = ( fray->rdir[0]*fxf.xfm[0][n] +
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fray->rdir[1]*fxf.xfm[1][n] +
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fray->rdir[2]*fxf.xfm[2][n] )
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/ fxf.sca ;
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} else if (n < 6) { /* surface normal */
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res = ( fray->ron[0]*fxf.xfm[0][n-3] +
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fray->ron[1]*fxf.xfm[1][n-3] +
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fray->ron[2]*fxf.xfm[2][n-3] )
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/ fxf.sca ;
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} else { /* intersection */
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res = fray->rop[0]*fxf.xfm[0][n-6] +
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fray->rop[1]*fxf.xfm[1][n-6] +
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fray->rop[2]*fxf.xfm[2][n-6] +
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fxf.xfm[3][n-6] ;
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}
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return(res);
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}
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