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/* Copyright (c) 1991 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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XF unitxf = { /* identity transform */ |
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1.0, 0.0, 0.0, 0.0, |
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0.0, 1.0, 0.0, 0.0, |
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0.0, 0.0, 1.0, 0.0, |
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0.0, 0.0, 0.0, 1.0, |
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1.0 |
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}; |
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|
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XF funcxf; /* current transformation */ |
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static OBJREC *fobj = NULL; /* current function object */ |
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static RAY *fray = NULL; /* current function ray */ |
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|
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|
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setmap(m, r, bx) /* set channels for function call */ |
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OBJREC *m; |
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register RAY *r; |
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XF *bx; |
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{ |
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extern double l_arg(); |
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extern long eclock; |
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static char *initfile = "rayinit.cal"; |
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static long lastrno = -1; |
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/* check to see if already set */ |
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if (m == fobj && r->rno == lastrno) |
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return(0); |
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/* initialize if first call */ |
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if (initfile != NULL) { |
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loadfunc(initfile); |
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scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0); |
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scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0); |
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scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0); |
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scompile("T=$10;Rdot=$11;", NULL, 0); |
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scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0); |
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scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0); |
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scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0); |
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scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0); |
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funset("arg", 1, '=', l_arg); |
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setnoisefuncs(); |
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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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if (r->rox != NULL) |
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if (bx != &unitxf) { |
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funcxf.sca = r->rox->b.sca * bx->sca; |
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multmat4(funcxf.xfm, r->rox->b.xfm, bx->xfm); |
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} else |
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copystruct(&funcxf, &r->rox->b); |
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else |
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copystruct(&funcxf, bx); |
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lastrno = r->rno; |
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eclock++; /* notify expression evaluator */ |
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return(1); |
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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; |
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register char **sa; |
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|
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for (n = m->oargs.nsargs, sa = m->oargs.sarg; |
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n > 0 && **sa != '-'; n--, sa++) |
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; |
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if (n == 0) |
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mxf = &unitxf; |
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else { |
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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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if (invxf(mxf, 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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} |
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m->os = (char *)mxf; |
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} |
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return(setmap(m, r, mxf)); |
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memerr: |
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error(SYSTEM, "out of memory in setfunc"); |
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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, R_OK)) == 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 sum; |
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register RAY *r; |
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|
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if (--n < 0) |
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goto badchan; |
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|
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if (n < 3) /* ray direction */ |
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|
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return( ( fray->rdir[0]*funcxf.xfm[0][n] + |
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fray->rdir[1]*funcxf.xfm[1][n] + |
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fray->rdir[2]*funcxf.xfm[2][n] ) |
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/ funcxf.sca ); |
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|
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if (n < 6) /* surface normal */ |
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|
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return( ( fray->ron[0]*funcxf.xfm[0][n-3] + |
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fray->ron[1]*funcxf.xfm[1][n-3] + |
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fray->ron[2]*funcxf.xfm[2][n-3] ) |
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/ funcxf.sca ); |
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|
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if (n < 9) /* intersection */ |
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|
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return( fray->rop[0]*funcxf.xfm[0][n-6] + |
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fray->rop[1]*funcxf.xfm[1][n-6] + |
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fray->rop[2]*funcxf.xfm[2][n-6] + |
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funcxf.xfm[3][n-6] ); |
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|
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if (n == 9) { /* distance */ |
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|
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sum = fray->rot; |
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for (r = fray->parent; r != NULL; r = r->parent) |
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sum += r->rot; |
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return(sum * funcxf.sca); |
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|
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} |
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if (n == 10) /* dot product (range [-1,1]) */ |
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return( fray->rod <= -1.0 ? -1.0 : |
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fray->rod >= 1.0 ? 1.0 : |
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fray->rod ); |
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|
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if (n == 11) /* scale */ |
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return(funcxf.sca); |
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|
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if (n < 15) /* origin */ |
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return(funcxf.xfm[3][n-12]); |
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|
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if (n < 18) /* i unit vector */ |
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return(funcxf.xfm[0][n-15] / funcxf.sca); |
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|
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if (n < 21) /* j unit vector */ |
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return(funcxf.xfm[1][n-15] / funcxf.sca); |
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|
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if (n < 24) /* k unit vector */ |
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return(funcxf.xfm[2][n-21] / funcxf.sca); |
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badchan: |
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error(USER, "illegal channel number"); |
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} |
