--- ray/src/rt/func.c 1991/06/17 08:51:33 1.17 +++ ray/src/rt/func.c 1993/03/08 12:37:23 2.8 @@ -1,4 +1,4 @@ -/* Copyright (c) 1991 Regents of the University of California */ +/* Copyright (c) 1992 Regents of the University of California */ #ifndef lint static char SCCSid[] = "$SunId$ LBL"; @@ -14,12 +14,19 @@ static char SCCSid[] = "$SunId$ LBL"; #include "otypes.h" +#include "func.h" + +#define INITFILE "rayinit.cal" +#define REFVNAME "`FILE_REFCNT" +#define CALSUF ".cal" +#define LCALSUF 4 + XF unitxf = { /* identity transform */ - 1.0, 0.0, 0.0, 0.0, - 0.0, 1.0, 0.0, 0.0, - 0.0, 0.0, 1.0, 0.0, - 0.0, 0.0, 0.0, 1.0, + {{1.0, 0.0, 0.0, 0.0}, + {0.0, 1.0, 0.0, 0.0}, + {0.0, 0.0, 1.0, 0.0}, + {0.0, 0.0, 0.0, 1.0}}, 1.0 }; @@ -27,82 +34,164 @@ XF funcxf; /* current transformation */ static OBJREC *fobj = NULL; /* current function object */ static RAY *fray = NULL; /* current function ray */ +static double l_erf(), l_erfc(), l_arg(); -setmap(m, r, bx) /* set channels for function call */ + +MFUNC * +getfunc(m, ff, ef, dofwd) /* get function for this modifier */ OBJREC *m; -register RAY *r; -XF *bx; +int ff; +unsigned ef; +int dofwd; { - extern double 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(0); - /* initialize if first call */ - if (initfile != NULL) { - loadfunc(initfile); + extern EPNODE *curfunc; + static char initfile[] = INITFILE; + char sbuf[MAXSTR]; + register char **arg; + register MFUNC *f; + int ne, na; + register int i; + /* check to see if done already */ + if ((f = (MFUNC *)m->os) != NULL) + return(f); + fobj = NULL; fray = NULL; + if (initfile[0]) { /* initialize on first call */ + setcontext(""); 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("T=$10;Ts=$25;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("erf", 1, ':', l_erf); + funset("erfc", 1, ':', l_erfc); setnoisefuncs(); - initfile = NULL; + loadfunc(initfile); + initfile[0] = '\0'; } + if ((na = m->oargs.nsargs) <= ff) + goto toofew; + arg = m->oargs.sarg; + if ((f = (MFUNC *)calloc(1, sizeof(MFUNC))) == NULL) + goto memerr; + i = strlen(arg[ff]); /* set up context */ + if (i == 1 && arg[ff][0] == '.') + setcontext(f->ctx = ""); /* "." means no file */ + else { + strcpy(sbuf,arg[ff]); /* file name is context */ + if (i > LCALSUF && !strcmp(sbuf+i-LCALSUF, CALSUF)) + sbuf[i-LCALSUF] = '\0'; /* remove suffix */ + setcontext(f->ctx = savestr(sbuf)); + if (!vardefined(REFVNAME)) { /* file loaded? */ + loadfunc(arg[ff]); + varset(REFVNAME, '=', 1.0); + } else /* reference_count++ */ + varset(REFVNAME, '=', varvalue(REFVNAME)+1.0); + } + curfunc = NULL; /* parse expressions */ + sprintf(sbuf, "%s \"%s\"", ofun[m->otype].funame, m->oname); + for (i=0, ne=0; ef && i < na; i++, ef>>=1) + if (ef & 1) { /* flagged as an expression? */ + if (ne >= MAXEXPR) + objerror(m, INTERNAL, "too many expressions"); + initstr(arg[i], sbuf, 0); + f->ep[ne++] = getE1(); + if (nextc != EOF) + syntax("unexpected character"); + } + if (ef) + goto toofew; + if (i <= ff) /* find transform args */ + i = ff+1; + while (i < na && arg[i][0] != '-') + i++; + if (i == na) /* no transform */ + f->f = f->b = &unitxf; + else { /* get transform */ + if ((f->b = (XF *)malloc(sizeof(XF))) == NULL) + goto memerr; + if (invxf(f->b, na-i, arg+i) != na-i) + objerror(m, USER, "bad transform"); + if (f->b->sca < 0.0) + f->b->sca = -f->b->sca; + if (dofwd) { /* do both transforms */ + if ((f->f = (XF *)malloc(sizeof(XF))) == NULL) + goto memerr; + xf(f->f, na-i, arg+i); + if (f->f->sca < 0.0) + f->f->sca = -f->f->sca; + } + } + m->os = (char *)f; + return(f); +toofew: + objerror(m, USER, "too few string arguments"); +memerr: + error(SYSTEM, "out of memory in getfunc"); +} + + +freefunc(m) /* free memory associated with modifier */ +OBJREC *m; +{ + register MFUNC *f; + register int i; + + if ((f = (MFUNC *)m->os) == NULL) + return; + for (i = 0; f->ep[i] != NULL; i++) + epfree(f->ep[i]); + if (f->ctx[0]) { /* done with definitions */ + setcontext(f->ctx); + i = varvalue(REFVNAME)-.5; /* reference_count-- */ + if (i > 0) + varset(REFVNAME, '=', (double)i); + else + dcleanup(2); /* remove definitions */ + freestr(f->ctx); + } + if (f->b != &unitxf) + free((char *)f->b); + if (f->f != NULL && f->f != &unitxf) + free((char *)f->f); + free((char *)f); + m->os = NULL; +} + + +setfunc(m, r) /* set channels for function call */ +OBJREC *m; +register RAY *r; +{ + static long lastrno = -1; + register MFUNC *f; + /* get function */ + if ((f = (MFUNC *)m->os) == NULL) + error(m, CONSISTENCY, "setfunc called before getfunc"); + /* set evaluator context */ + setcontext(f->ctx); + /* check to see if matrix set */ + if (m == fobj && r->rno == lastrno) + return(0); fobj = m; fray = r; if (r->rox != NULL) - if (bx != &unitxf) { - funcxf.sca = r->rox->b.sca * bx->sca; - multmat4(funcxf.xfm, r->rox->b.xfm, bx->xfm); + if (f->b != &unitxf) { + funcxf.sca = r->rox->b.sca * f->b->sca; + multmat4(funcxf.xfm, r->rox->b.xfm, f->b->xfm); } else copystruct(&funcxf, &r->rox->b); else - copystruct(&funcxf, bx); + copystruct(&funcxf, f->b); lastrno = r->rno; eclock++; /* notify expression evaluator */ return(1); } -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++) - ; - if (n == 0) - mxf = &unitxf; - else { - 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; - } - return(setmap(m, r, mxf)); -memerr: - error(SYSTEM, "out of memory in setfunc"); -} - - loadfunc(fname) /* load definition file */ char *fname; { @@ -117,12 +206,15 @@ char *fname; } -double +static double l_arg() /* return nth real argument */ { extern double argument(); register int n; + if (fobj == NULL) + syntax("arg(n) used in constant expression"); + n = argument(1) + .5; /* round to integer */ if (n < 1) @@ -136,6 +228,24 @@ l_arg() /* return nth real argument */ } +static double +l_erf() /* error function */ +{ + extern double erf(); + + return(erf(argument(1))); +} + + +static double +l_erfc() /* cumulative error function */ +{ + extern double erfc(); + + return(erfc(argument(1))); +} + + double chanvalue(n) /* return channel n to calcomp */ register int n; @@ -143,6 +253,9 @@ register int n; double sum; register RAY *r; + if (fray == NULL) + syntax("ray parameter used in constant expression"); + if (--n < 0) goto badchan; @@ -167,17 +280,19 @@ register int n; fray->rop[2]*funcxf.xfm[2][n-6] + funcxf.xfm[3][n-6] ); - if (n == 9) { /* distance */ - + if (n == 9) { /* total 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 == 10) /* dot product (range [-1,1]) */ + return( fray->rod <= -1.0 ? -1.0 : + fray->rod >= 1.0 ? 1.0 : + fray->rod ); + if (n == 11) /* scale */ return(funcxf.sca); @@ -192,6 +307,14 @@ register int n; if (n < 24) /* k unit vector */ return(funcxf.xfm[2][n-21] / funcxf.sca); + + if (n == 24) { /* single ray (shadow) distance */ + sum = fray->rot; + for (r = fray->parent; r != NULL && r->crtype&SHADOW; + r = r->parent) + sum += r->rot; + return(sum * funcxf.sca); + } badchan: error(USER, "illegal channel number"); }