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#ifndef lint
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static const char RCSid[] = "$Id: func.c,v 2.24 2011/02/22 16:45:12 greg Exp $";
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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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#include "copyright.h"
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#include "ray.h"
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#include "paths.h"
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#include "otypes.h"
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#include "func.h"
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#define INITFILE "rayinit.cal"
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#define CALSUF ".cal"
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#define LCALSUF 4
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char REFVNAME[] = "`FILE_REFCNT";
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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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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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static double l_erf(char *), l_erfc(char *), l_arg(char *);
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MFUNC *
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getfunc( /* get function for this modifier */
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OBJREC *m,
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int ff,
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unsigned int ef,
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int dofwd
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)
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{
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static char initfile[] = INITFILE;
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char sbuf[MAXSTR];
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char **arg;
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MFUNC *f;
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int ne, na;
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int i;
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/* check to see if done already */
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if ((f = (MFUNC *)m->os) != NULL)
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return(f);
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fobj = NULL; fray = NULL;
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if (initfile[0]) { /* initialize on first call */
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esupport |= E_VARIABLE|E_FUNCTION|E_INCHAN|E_RCONST|E_REDEFW;
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esupport &= ~(E_OUTCHAN);
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setcontext("");
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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;Ts=$25;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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scompile("Lu=$26;Lv=$27;", NULL, 0);
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funset("arg", 1, '=', l_arg);
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funset("erf", 1, ':', l_erf);
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funset("erfc", 1, ':', l_erfc);
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setnoisefuncs();
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setprismfuncs();
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loadfunc(initfile);
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initfile[0] = '\0';
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}
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if ((na = m->oargs.nsargs) <= ff)
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goto toofew;
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arg = m->oargs.sarg;
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if ((f = (MFUNC *)calloc(1, sizeof(MFUNC))) == NULL)
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goto memerr;
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i = strlen(arg[ff]); /* set up context */
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if (i == 1 && arg[ff][0] == '.')
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setcontext(f->ctx = ""); /* "." means no file */
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else {
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strcpy(sbuf,arg[ff]); /* file name is context */
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if (i > LCALSUF && !strcmp(sbuf+i-LCALSUF, CALSUF))
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sbuf[i-LCALSUF] = '\0'; /* remove suffix */
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setcontext(f->ctx = savestr(sbuf));
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if (!vardefined(REFVNAME)) { /* file loaded? */
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loadfunc(arg[ff]);
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varset(REFVNAME, '=', 1.0);
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} else /* reference_count++ */
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varset(REFVNAME, '=', varvalue(REFVNAME)+1.0);
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}
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curfunc = NULL; /* parse expressions */
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sprintf(sbuf, "%s \"%s\"", ofun[m->otype].funame, m->oname);
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for (i=0, ne=0; ef && i < na; i++, ef>>=1)
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if (ef & 1) { /* flagged as an expression? */
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if (ne >= MAXEXPR)
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objerror(m, INTERNAL, "too many expressions");
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initstr(arg[i], sbuf, 0);
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f->ep[ne++] = getE1();
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if (nextc != EOF)
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syntax("unexpected character");
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}
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if (ef)
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goto toofew;
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if (i <= ff) /* find transform args */
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i = ff+1;
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while (i < na && arg[i][0] != '-')
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i++;
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if (i == na) /* no transform */
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f->f = f->b = &unitxf;
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else { /* get transform */
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if ((f->b = (XF *)malloc(sizeof(XF))) == NULL)
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goto memerr;
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if (invxf(f->b, na-i, arg+i) != na-i)
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objerror(m, USER, "bad transform");
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if (f->b->sca < 0.0)
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f->b->sca = -f->b->sca;
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if (dofwd) { /* do both transforms */
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if ((f->f = (XF *)malloc(sizeof(XF))) == NULL)
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goto memerr;
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xf(f->f, na-i, arg+i);
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if (f->f->sca < 0.0)
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f->f->sca = -f->f->sca;
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}
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}
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m->os = (char *)f;
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return(f);
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toofew:
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objerror(m, USER, "too few string arguments");
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memerr:
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error(SYSTEM, "out of memory in getfunc");
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return NULL; /* pro forma return */
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}
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void
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freefunc( /* free memory associated with modifier */
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OBJREC *m
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)
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{
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MFUNC *f;
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int i;
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if ((f = (MFUNC *)m->os) == NULL)
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return;
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for (i = 0; f->ep[i] != NULL; i++)
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epfree(f->ep[i]);
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if (f->ctx[0]) { /* done with definitions */
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setcontext(f->ctx);
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i = varvalue(REFVNAME)-.5; /* reference_count-- */
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if (i > 0)
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varset(REFVNAME, '=', (double)i);
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else
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dcleanup(2); /* remove definitions */
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freestr(f->ctx);
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}
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if (f->b != &unitxf)
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free((void *)f->b);
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if ((f->f != NULL) & (f->f != &unitxf))
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free((void *)f->f);
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free((void *)f);
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m->os = NULL;
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}
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int
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setfunc( /* set channels for function call */
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OBJREC *m, /* can be NULL */
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RAY *r
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)
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{
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static RNUMBER lastrno = ~0;
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MFUNC *f;
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/* get function if any */
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if (m != NULL) {
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if ((f = (MFUNC *)m->os) == NULL)
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objerror(m, CONSISTENCY, "setfunc called before getfunc");
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setcontext(f->ctx); /* set evaluator context */
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} else
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setcontext("");
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/* check to see if matrix set */
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if ((m == fobj) & (r->rno == lastrno))
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return(0);
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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 (f->b != &unitxf) {
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funcxf.sca = r->rox->b.sca * f->b->sca;
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multmat4(funcxf.xfm, r->rox->b.xfm, f->b->xfm);
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} else
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funcxf = r->rox->b;
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else
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funcxf = *(f->b);
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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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void
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loadfunc( /* load definition file */
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char *fname
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)
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{
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char *ffname;
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if ((ffname = getpath(fname, getrlibpath(), 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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static double
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l_arg(char *nm) /* return nth real argument */
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{
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int n;
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if (fobj == NULL)
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error(USER, "arg(n) called without a context");
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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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static double
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l_erf(char *nm) /* error function */
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{
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return(erf(argument(1)));
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}
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static double
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l_erfc(char *nm) /* cumulative error function */
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{
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return(erfc(argument(1)));
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}
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double
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chanvalue( /* return channel n to calcomp */
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int n
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)
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{
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if (fray == NULL)
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syntax("ray parameter used in constant expression");
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if (--n < 0)
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goto badchan;
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if (n <= 2) /* ray direction */
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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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if (n <= 5) /* surface normal */
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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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if (n <= 8) /* intersection */
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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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if (n == 9) /* total distance */
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return(raydist(fray,PRIMARY) * funcxf.sca);
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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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if (n == 11) /* scale */
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return(funcxf.sca);
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if (n <= 14) /* origin */
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return(funcxf.xfm[3][n-12]);
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if (n <= 17) /* i unit vector */
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return(funcxf.xfm[0][n-15] / funcxf.sca);
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if (n <= 20) /* j unit vector */
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return(funcxf.xfm[1][n-18] / funcxf.sca);
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if (n <= 23) /* k unit vector */
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return(funcxf.xfm[2][n-21] / funcxf.sca);
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if (n == 24) /* single ray (shadow) distance */
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return((fray->rot+raydist(fray->parent,SHADOW)) * funcxf.sca);
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if (n <= 26) /* local (u,v) coordinates */
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return(fray->uv[n-25]);
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badchan:
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error(USER, "illegal channel number");
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return(0.0);
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}
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