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#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: func.c,v 2.20 2003/08/04 22:37:53 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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|
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#include "copyright.h" |
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|
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#include "ray.h" |
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|
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#include "paths.h" |
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|
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#include "otypes.h" |
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|
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#include "func.h" |
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|
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|
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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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|
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XF unitxf = { /* identity transform */ |
| 25 |
{{1.0, 0.0, 0.0, 0.0}, |
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{0.0, 1.0, 0.0, 0.0}, |
| 27 |
{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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static double l_erf(char *), l_erfc(char *), l_arg(char *); |
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|
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|
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MFUNC * |
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getfunc(m, ff, ef, dofwd) /* 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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static char initfile[] = INITFILE; |
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char sbuf[MAXSTR]; |
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register char **arg; |
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register MFUNC *f; |
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int ne, na; |
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register 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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} |
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|
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|
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void |
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freefunc(m) /* free memory associated with modifier */ |
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OBJREC *m; |
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{ |
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register MFUNC *f; |
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register int i; |
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|
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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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|
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|
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int |
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setfunc(m, r) /* set channels for function call */ |
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OBJREC *m; |
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register RAY *r; |
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{ |
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static unsigned long lastrno = ~0; |
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register MFUNC *f; |
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/* get function */ |
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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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/* set evaluator context */ |
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setcontext(f->ctx); |
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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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|
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|
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void |
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loadfunc(fname) /* load definition file */ |
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char *fname; |
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{ |
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char *ffname; |
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|
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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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|
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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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register int n; |
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|
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if (fobj == NULL) |
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syntax("arg(n) used in constant expression"); |
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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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static double |
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l_erf(char *nm) /* error function */ |
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{ |
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extern double erf(); |
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|
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return(erf(argument(1))); |
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} |
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|
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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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extern double erfc(); |
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|
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return(erfc(argument(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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if (fray == NULL) |
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syntax("ray parameter used in constant expression"); |
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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 <= 2) /* 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 <= 5) /* 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 <= 8) /* 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) /* total distance */ |
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return(raydist(fray,PRIMARY) * funcxf.sca); |
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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 <= 14) /* origin */ |
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return(funcxf.xfm[3][n-12]); |
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|
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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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|
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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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|
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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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|
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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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|
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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: |
| 312 |
error(USER, "illegal channel number"); |
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return(0.0); |
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} |
