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/* Copyright (c) 1986 Regents of the University of California */ |
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|
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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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/* |
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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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|
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#include "ray.h" |
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|
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#include "otypes.h" |
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|
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|
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typedef struct { |
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double sca; /* scalefactor */ |
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double xfm[4][4]; /* transform matrix */ |
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} XF; |
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|
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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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|
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|
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setmap(m, r, sca, xfm) /* set channels for function call */ |
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OBJREC *m; |
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register RAY *r; |
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double sca; |
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double xfm[4][4]; |
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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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|
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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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|
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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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register XF *mxf; |
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|
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if ((mxf = (XF *)m->os) == NULL) { |
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register int n = m->oargs.nsargs; |
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register char **sa = m->oargs.sarg; |
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|
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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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m->os = (char *)mxf; |
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} |
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setmap(m, r, mxf->sca, mxf->xfm); |
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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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|
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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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|
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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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|
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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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|
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n = argument(1) + .5; /* round to integer */ |
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|
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if (n < 1) |
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return(fobj->oargs.nfargs); |
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|
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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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|
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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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|
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n--; /* for convenience */ |
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|
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if (n < 0 || n > 10) |
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error(USER, "illegal channel number"); |
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|
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if (n == 9) { /* distance */ |
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|
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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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|
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} else if (n == 10) { /* dot product */ |
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|
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res = fray->rod; |
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|
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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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|
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return(res); |
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} |
