| 1 |
greg |
1.13 |
/* Copyright (c) 1991 Regents of the University of California */
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| 2 |
greg |
1.1 |
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| 3 |
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#ifndef lint
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| 4 |
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static char SCCSid[] = "$SunId$ LBL";
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| 5 |
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#endif
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| 6 |
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| 7 |
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/*
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| 8 |
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* func.c - interface to calcomp functions.
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| 9 |
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*
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| 10 |
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* 4/7/86
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| 11 |
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*/
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| 13 |
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#include "ray.h"
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| 14 |
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| 15 |
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#include "otypes.h"
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| 16 |
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| 17 |
greg |
2.2 |
#include "func.h"
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| 18 |
greg |
1.1 |
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| 19 |
greg |
2.2 |
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| 20 |
greg |
1.21 |
#define INITFILE "rayinit.cal"
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| 21 |
greg |
2.2 |
#define REFVNAME "`FILE_REFCNT"
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| 22 |
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#define CALSUF ".cal"
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| 23 |
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#define LCALSUF 4
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| 24 |
greg |
1.21 |
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| 25 |
greg |
1.13 |
XF unitxf = { /* identity transform */
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| 26 |
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1.0, 0.0, 0.0, 0.0,
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| 27 |
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0.0, 1.0, 0.0, 0.0,
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| 28 |
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0.0, 0.0, 1.0, 0.0,
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| 29 |
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0.0, 0.0, 0.0, 1.0,
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| 30 |
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1.0
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| 31 |
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};
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| 32 |
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| 33 |
greg |
1.12 |
XF funcxf; /* current transformation */
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static OBJREC *fobj = NULL; /* current function object */
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| 35 |
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static RAY *fray = NULL; /* current function ray */
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| 36 |
greg |
1.1 |
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| 37 |
greg |
2.2 |
static double l_erf(), l_erfc(), l_arg();
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| 38 |
greg |
1.1 |
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| 39 |
greg |
2.2 |
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| 40 |
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MFUNC *
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| 41 |
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getfunc(m, ff, ef, dofwd) /* get function for this modifier */
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greg |
1.1 |
OBJREC *m;
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greg |
2.2 |
int ff;
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| 44 |
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unsigned ef;
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int dofwd;
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{
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| 47 |
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extern EPNODE *curfunc;
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| 48 |
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static char initfile[] = INITFILE;
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char sbuf[MAXSTR];
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| 50 |
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register char **arg;
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| 51 |
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register MFUNC *f;
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| 52 |
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int ne, na;
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| 53 |
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register int i;
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| 54 |
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/* check to see if done already */
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if ((f = (MFUNC *)m->os) != NULL)
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| 56 |
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return(f);
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| 57 |
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if (initfile[0]) { /* initialize on first call */
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| 58 |
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setcontext("");
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| 59 |
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scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0);
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| 60 |
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scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0);
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| 61 |
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scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0);
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| 62 |
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scompile("T=$10;Rdot=$11;", NULL, 0);
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| 63 |
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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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| 65 |
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scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0);
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| 66 |
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scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0);
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| 67 |
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funset("arg", 1, '=', l_arg);
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| 68 |
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funset("erf", 1, ':', l_erf);
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| 69 |
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funset("erfc", 1, ':', l_erfc);
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| 70 |
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setnoisefuncs();
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| 71 |
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loadfunc(initfile);
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initfile[0] = '\0';
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| 73 |
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}
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| 74 |
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if ((na = m->oargs.nsargs) <= ff)
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| 75 |
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goto toofew;
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| 76 |
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arg = m->oargs.sarg;
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| 77 |
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if ((f = (MFUNC *)calloc(1, sizeof(MFUNC))) == NULL)
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| 78 |
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goto memerr;
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| 79 |
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i = strlen(arg[ff]); /* set up context */
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| 80 |
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if (i == 1 && arg[ff][0] == '.')
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| 81 |
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setcontext(f->ctx = ""); /* "." means no file */
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| 82 |
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else {
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| 83 |
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strcpy(sbuf,m->oargs.sarg[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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| 86 |
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setcontext(f->ctx = savestr(sbuf));
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| 87 |
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if (!vardefined(REFVNAME)) { /* file loaded? */
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| 88 |
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loadfunc(m->oargs.sarg[ff]);
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| 89 |
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varset(REFVNAME, '=', 1.0);
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| 90 |
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} else /* reference_count++ */
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| 91 |
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varset(REFVNAME, '=', varvalue(REFVNAME)+1.0);
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| 92 |
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}
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| 93 |
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curfunc = NULL; /* parse expressions */
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| 94 |
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sprintf(sbuf, "%s \"%s\"", ofun[m->otype].funame, m->oname);
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| 95 |
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for (i=0, ne=0; ef && i < na; i++, ef>>=1)
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| 96 |
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if (ef & 1) { /* flagged as an expression? */
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| 97 |
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if (ne >= MAXEXPR)
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| 98 |
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objerror(m, INTERNAL, "too many expressions");
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| 99 |
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initstr(arg[i], sbuf, 0);
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| 100 |
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f->ep[ne++] = getE1();
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| 101 |
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if (nextc != EOF)
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| 102 |
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syntax("unexpected character");
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| 103 |
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}
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| 104 |
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if (ef)
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| 105 |
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goto toofew;
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| 106 |
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if (i <= ff) /* find transform args */
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| 107 |
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i = ff+1;
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| 108 |
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while (i < na && arg[i][0] != '-')
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| 109 |
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i++;
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| 110 |
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if (i == na) /* no transform */
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| 111 |
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f->f = f->b = &unitxf;
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| 112 |
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else { /* get transform */
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| 113 |
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if ((f->b = (XF *)malloc(sizeof(XF))) == NULL)
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| 114 |
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goto memerr;;
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| 115 |
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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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| 117 |
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if (f->b->sca < 0.0)
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| 118 |
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f->b->sca = -f->b->sca;
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| 119 |
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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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| 121 |
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goto memerr;;
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| 122 |
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xf(f->f, na-i, arg+i);
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| 123 |
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if (f->f->sca < 0.0)
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| 124 |
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f->f->sca = -f->f->sca;
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| 125 |
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}
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| 126 |
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}
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| 127 |
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m->os = (char *)f;
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| 128 |
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return(f);
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| 129 |
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toofew:
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| 130 |
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objerror(m, USER, "too few arguments");
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| 131 |
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memerr:
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| 132 |
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error(SYSTEM, "out of memory in getfunc");
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| 133 |
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}
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| 134 |
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| 135 |
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| 136 |
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freefunc(m) /* free memory associated with modifier */
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| 137 |
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OBJREC *m;
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| 138 |
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{
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| 139 |
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register MFUNC *f;
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| 140 |
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register int i;
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| 141 |
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| 142 |
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if ((f = (MFUNC *)m->os) == NULL)
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| 143 |
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return;
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| 144 |
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for (i = 0; f->ep[i] != NULL; i++)
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| 145 |
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epfree(f->ep[i]);
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| 146 |
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if (f->ctx[0]) { /* done with definitions */
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| 147 |
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setcontext(f->ctx);
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| 148 |
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i = varvalue(REFVNAME)-.5; /* reference_count-- */
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| 149 |
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if (i > 0)
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| 150 |
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varset(REFVNAME, '=', (double)i);
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| 151 |
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else
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| 152 |
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dcleanup(2); /* remove definitions */
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| 153 |
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freestr(f->ctx);
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| 154 |
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}
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| 155 |
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if (f->b != &unitxf)
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| 156 |
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free((char *)f->b);
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| 157 |
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if (f->f != NULL && f->f != &unitxf)
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| 158 |
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free((char *)f->f);
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| 159 |
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free((char *)f);
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| 160 |
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m->os = NULL;
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| 161 |
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}
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| 162 |
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| 163 |
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| 164 |
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setfunc(m, r) /* set channels for function call */
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| 165 |
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OBJREC *m;
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| 166 |
greg |
1.1 |
register RAY *r;
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| 167 |
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{
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| 168 |
greg |
1.16 |
static long lastrno = -1;
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| 169 |
greg |
2.2 |
register MFUNC *f;
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| 170 |
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/* get function */
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| 171 |
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if ((f = (MFUNC *)m->os) == NULL)
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| 172 |
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error(m, CONSISTENCY, "setfunc called before getfunc");
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| 173 |
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/* set evaluator context */
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| 174 |
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setcontext(f->ctx);
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| 175 |
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/* check to see if matrix set */
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| 176 |
greg |
1.16 |
if (m == fobj && r->rno == lastrno)
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| 177 |
greg |
1.17 |
return(0);
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| 178 |
greg |
1.1 |
fobj = m;
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| 179 |
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fray = r;
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| 180 |
greg |
1.13 |
if (r->rox != NULL)
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| 181 |
greg |
2.2 |
if (f->b != &unitxf) {
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| 182 |
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funcxf.sca = r->rox->b.sca * f->b->sca;
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| 183 |
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multmat4(funcxf.xfm, r->rox->b.xfm, f->b->xfm);
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| 184 |
greg |
1.13 |
} else
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| 185 |
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copystruct(&funcxf, &r->rox->b);
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| 186 |
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else
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| 187 |
greg |
2.2 |
copystruct(&funcxf, f->b);
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| 188 |
greg |
1.16 |
lastrno = r->rno;
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| 189 |
greg |
1.1 |
eclock++; /* notify expression evaluator */
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| 190 |
greg |
1.17 |
return(1);
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| 191 |
greg |
1.1 |
}
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| 192 |
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| 193 |
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| 194 |
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loadfunc(fname) /* load definition file */
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| 195 |
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char *fname;
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| 196 |
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{
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| 197 |
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extern char *libpath; /* library search path */
|
| 198 |
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char *ffname;
|
| 199 |
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| 200 |
greg |
1.6 |
if ((ffname = getpath(fname, libpath, R_OK)) == NULL) {
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| 201 |
greg |
1.1 |
sprintf(errmsg, "cannot find function file \"%s\"", fname);
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| 202 |
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error(USER, errmsg);
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| 203 |
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}
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| 204 |
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fcompile(ffname);
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| 205 |
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}
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| 206 |
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| 207 |
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| 208 |
greg |
2.2 |
static double
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| 209 |
greg |
1.1 |
l_arg() /* return nth real argument */
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| 210 |
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{
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| 211 |
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extern double argument();
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| 212 |
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register int n;
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| 213 |
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| 214 |
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n = argument(1) + .5; /* round to integer */
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| 215 |
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| 216 |
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if (n < 1)
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| 217 |
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return(fobj->oargs.nfargs);
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| 218 |
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| 219 |
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if (n > fobj->oargs.nfargs) {
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| 220 |
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sprintf(errmsg, "missing real argument %d", n);
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| 221 |
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objerror(fobj, USER, errmsg);
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| 222 |
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}
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| 223 |
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return(fobj->oargs.farg[n-1]);
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| 224 |
greg |
1.19 |
}
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| 225 |
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| 226 |
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| 227 |
greg |
2.2 |
static double
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| 228 |
greg |
1.19 |
l_erf() /* error function */
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| 229 |
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{
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| 230 |
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extern double erf();
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| 231 |
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| 232 |
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return(erf(argument(1)));
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| 233 |
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}
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| 234 |
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| 235 |
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| 236 |
greg |
2.2 |
static double
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| 237 |
greg |
1.19 |
l_erfc() /* cumulative error function */
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| 238 |
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{
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| 239 |
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extern double erfc();
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| 240 |
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| 241 |
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return(erfc(argument(1)));
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| 242 |
greg |
1.1 |
}
|
| 243 |
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| 244 |
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| 245 |
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double
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| 246 |
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chanvalue(n) /* return channel n to calcomp */
|
| 247 |
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register int n;
|
| 248 |
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{
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| 249 |
greg |
1.8 |
double sum;
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| 250 |
greg |
1.1 |
register RAY *r;
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| 251 |
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| 252 |
greg |
1.10 |
if (--n < 0)
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| 253 |
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goto badchan;
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| 254 |
greg |
1.1 |
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| 255 |
greg |
1.8 |
if (n < 3) /* ray direction */
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| 256 |
greg |
1.1 |
|
| 257 |
greg |
1.12 |
return( ( fray->rdir[0]*funcxf.xfm[0][n] +
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| 258 |
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fray->rdir[1]*funcxf.xfm[1][n] +
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| 259 |
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fray->rdir[2]*funcxf.xfm[2][n] )
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| 260 |
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/ funcxf.sca );
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| 261 |
greg |
1.1 |
|
| 262 |
greg |
1.8 |
if (n < 6) /* surface normal */
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| 263 |
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| 264 |
greg |
1.12 |
return( ( fray->ron[0]*funcxf.xfm[0][n-3] +
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| 265 |
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fray->ron[1]*funcxf.xfm[1][n-3] +
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| 266 |
|
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fray->ron[2]*funcxf.xfm[2][n-3] )
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| 267 |
|
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/ funcxf.sca );
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| 268 |
greg |
1.8 |
|
| 269 |
|
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if (n < 9) /* intersection */
|
| 270 |
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| 271 |
greg |
1.12 |
return( fray->rop[0]*funcxf.xfm[0][n-6] +
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| 272 |
|
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fray->rop[1]*funcxf.xfm[1][n-6] +
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| 273 |
|
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fray->rop[2]*funcxf.xfm[2][n-6] +
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| 274 |
|
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funcxf.xfm[3][n-6] );
|
| 275 |
greg |
1.8 |
|
| 276 |
greg |
1.10 |
if (n == 9) { /* distance */
|
| 277 |
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|
| 278 |
|
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sum = fray->rot;
|
| 279 |
|
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for (r = fray->parent; r != NULL; r = r->parent)
|
| 280 |
|
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sum += r->rot;
|
| 281 |
greg |
1.12 |
return(sum * funcxf.sca);
|
| 282 |
greg |
1.10 |
|
| 283 |
|
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}
|
| 284 |
greg |
1.18 |
if (n == 10) /* dot product (range [-1,1]) */
|
| 285 |
|
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return( fray->rod <= -1.0 ? -1.0 :
|
| 286 |
|
|
fray->rod >= 1.0 ? 1.0 :
|
| 287 |
|
|
fray->rod );
|
| 288 |
greg |
1.10 |
|
| 289 |
greg |
1.8 |
if (n == 11) /* scale */
|
| 290 |
greg |
1.12 |
return(funcxf.sca);
|
| 291 |
greg |
1.8 |
|
| 292 |
|
|
if (n < 15) /* origin */
|
| 293 |
greg |
1.12 |
return(funcxf.xfm[3][n-12]);
|
| 294 |
greg |
1.8 |
|
| 295 |
|
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if (n < 18) /* i unit vector */
|
| 296 |
greg |
1.12 |
return(funcxf.xfm[0][n-15] / funcxf.sca);
|
| 297 |
greg |
1.8 |
|
| 298 |
|
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if (n < 21) /* j unit vector */
|
| 299 |
greg |
1.12 |
return(funcxf.xfm[1][n-15] / funcxf.sca);
|
| 300 |
greg |
1.8 |
|
| 301 |
|
|
if (n < 24) /* k unit vector */
|
| 302 |
greg |
1.12 |
return(funcxf.xfm[2][n-21] / funcxf.sca);
|
| 303 |
greg |
1.10 |
badchan:
|
| 304 |
|
|
error(USER, "illegal channel number");
|
| 305 |
greg |
1.1 |
}
|
