| 1 |
#ifndef lint
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| 2 |
static const char RCSid[] = "$Id: func.c,v 2.45 2025/11/13 18:57:20 greg Exp $";
|
| 3 |
#endif
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| 4 |
/*
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| 5 |
* func.c - interface to calcomp functions.
|
| 6 |
*/
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| 7 |
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| 8 |
#include "copyright.h"
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| 9 |
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| 10 |
#include "ray.h"
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| 11 |
#include "paths.h"
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| 12 |
#include "otypes.h"
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| 13 |
#include "func.h"
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| 14 |
#include <ctype.h>
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| 15 |
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| 16 |
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| 17 |
#define INITFILE "rayinit.cal"
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| 18 |
#define CALSUF ".cal"
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| 19 |
#define LCALSUF 4
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| 20 |
char REFVNAME[] = "`FILE_REFCNT";
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| 21 |
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| 22 |
XF unitxf = { /* identity transform */
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| 23 |
{{1.0, 0.0, 0.0, 0.0},
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| 24 |
{0.0, 1.0, 0.0, 0.0},
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| 25 |
{0.0, 0.0, 1.0, 0.0},
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| 26 |
{0.0, 0.0, 0.0, 1.0}},
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| 27 |
1.0
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| 28 |
};
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| 29 |
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| 30 |
XF funcxf; /* current transformation */
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| 31 |
static OBJREC *fobj = NULL; /* current function object */
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| 32 |
static RAY *fray = NULL; /* current function ray */
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| 33 |
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| 34 |
static char rayinitcal[] = INITFILE;
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| 35 |
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| 36 |
static double l_erf(char *), l_erfc(char *), l_arg(char *);
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| 37 |
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| 38 |
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| 39 |
void
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| 40 |
initfunc(void) /* initialize function evaluation */
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{
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| 42 |
if (!rayinitcal[0]) /* already done? */
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| 43 |
return;
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| 44 |
esupport |= E_VARIABLE|E_FUNCTION|E_INCHAN|E_RCONST|E_REDEFW;
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| 45 |
esupport &= ~(E_OUTCHAN);
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| 46 |
calcontext("");
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| 47 |
scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0);
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| 48 |
scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0);
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| 49 |
scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0);
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| 50 |
scompile("T=$10;Ts=$25;Rdot=$11;", NULL, 0);
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| 51 |
scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0);
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| 52 |
scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0);
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| 53 |
scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0);
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| 54 |
scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0);
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| 55 |
scompile("Lu=$26;Lv=$27;", NULL, 0);
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| 56 |
funset("arg", 1, '=', l_arg);
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| 57 |
funset("erf", 1, ':', l_erf);
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| 58 |
funset("erfc", 1, ':', l_erfc);
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| 59 |
setnoisefuncs();
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| 60 |
setprismfuncs();
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| 61 |
loadfunc(rayinitcal);
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rayinitcal[0] = '\0';
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| 63 |
doptimize(1); /* optimize definitions */
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| 64 |
}
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| 65 |
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| 66 |
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| 67 |
/* Set parameters for current evaluation */
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| 68 |
void
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| 69 |
set_eparams(const char *prms)
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| 70 |
{
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| 71 |
static const char *last_params = NULL;
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| 72 |
char vname[RMAXWORD];
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| 73 |
double value;
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| 74 |
char *cpd;
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| 75 |
/* check if already set */
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| 76 |
if (prms == NULL || !*prms)
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| 77 |
return;
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| 78 |
if (prms == last_params || (last_params != NULL &&
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| 79 |
!strcmp(prms, last_params)))
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| 80 |
return;
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| 81 |
last_params = prms; /* XXX assumes static string */
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| 82 |
/* assign each variable */
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| 83 |
while (*prms) {
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| 84 |
if (isspace(*prms)) {
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| 85 |
++prms; continue;
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| 86 |
}
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| 87 |
if (!isalpha(*prms))
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| 88 |
goto bad_params;
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| 89 |
cpd = vname;
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| 90 |
while (*prms && (*prms != '=') & !isspace(*prms)) {
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| 91 |
if (!isid(*prms) | (cpd-vname >= RMAXWORD-1))
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| 92 |
goto bad_params;
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| 93 |
*cpd++ = *prms++;
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| 94 |
}
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| 95 |
*cpd = '\0';
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| 96 |
while (isspace(*prms)) prms++;
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| 97 |
if (*prms++ != '=')
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| 98 |
goto bad_params;
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| 99 |
value = atof(prms);
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| 100 |
if ((prms = fskip((char *)prms)) == NULL)
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| 101 |
goto bad_params;
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| 102 |
while (isspace(*prms)) prms++;
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prms += (*prms == ',') | (*prms == ';') | (*prms == ':');
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| 104 |
varset(vname, '=', value);
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}
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eclock++; /* notify expression evaluator */
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return;
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bad_params:
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sprintf(errmsg, "bad parameter list '%s'", last_params);
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error(USER, errmsg);
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}
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| 113 |
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| 114 |
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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| 122 |
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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| 126 |
int i;
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| 127 |
/* 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 ((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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calcontext(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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calcontext(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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ecurfunc = 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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esyntax("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 && !isxfopt(arg[i]))
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i++;
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if (i == na) { /* no transform */
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f->fxp = f->bxp = &unitxf;
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} else { /* get transform */
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if ((f->bxp = (XF *)malloc(sizeof(XF))) == NULL)
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goto memerr;
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if (invxf(f->bxp, na-i, arg+i) != na-i)
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objerror(m, USER, "bad transform");
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if (f->bxp->sca < 0.0)
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f->bxp->sca = -f->bxp->sca;
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if (dofwd) { /* do both transforms */
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if ((f->fxp = (XF *)malloc(sizeof(XF))) == NULL)
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goto memerr;
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xf(f->fxp, na-i, arg+i);
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if (f->fxp->sca < 0.0)
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f->fxp->sca = -f->fxp->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],1);
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if (f->ctx[0]) { /* done with definitions */
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calcontext(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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| 213 |
freestr(f->ctx);
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}
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if (f->bxp != &unitxf)
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| 216 |
free((void *)f->bxp);
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if ((f->fxp != NULL) & (f->fxp != &unitxf))
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free((void *)f->fxp);
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| 219 |
free((void *)f);
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m->os = NULL;
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}
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| 223 |
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int
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setfunc( /* set channels for function call */
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| 226 |
OBJREC *m,
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RAY *r
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)
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| 229 |
{
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| 230 |
static RNUMBER lastrno = ~0;
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| 231 |
MFUNC *f;
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| 232 |
/* get function if any */
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| 233 |
if ((f = (MFUNC *)m->os) == NULL)
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| 234 |
objerror(m, CONSISTENCY, "setfunc called before getfunc");
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| 235 |
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| 236 |
calcontext(f->ctx); /* set evaluator context */
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| 237 |
/* check to see if matrix set */
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| 238 |
if ((m == fobj) & (r->rno == lastrno))
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| 239 |
return(0);
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| 240 |
fobj = m;
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| 241 |
fray = r;
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| 242 |
if (r->rox != NULL) {
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| 243 |
if (f->bxp != &unitxf) {
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| 244 |
funcxf.sca = r->rox->b.sca * f->bxp->sca;
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| 245 |
multmat4(funcxf.xfm, r->rox->b.xfm, f->bxp->xfm);
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| 246 |
} else
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| 247 |
funcxf = r->rox->b;
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| 248 |
} else
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| 249 |
funcxf = *f->bxp;
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| 250 |
lastrno = r->rno;
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| 251 |
eclock++; /* notify expression evaluator */
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| 252 |
return(1);
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| 253 |
}
|
| 254 |
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| 255 |
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| 256 |
int
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| 257 |
worldfunc( /* special function context sans object */
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| 258 |
const char *ctx,
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| 259 |
RAY *r
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| 260 |
)
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| 261 |
{
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| 262 |
static RNUMBER lastrno = ~0;
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| 263 |
/* set evaluator context */
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| 264 |
calcontext((char *)ctx);
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| 265 |
/* check if ray already set */
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| 266 |
if ((fobj == NULL) & (r->rno == lastrno))
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| 267 |
return(0);
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| 268 |
fobj = NULL;
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| 269 |
fray = r;
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| 270 |
funcxf = unitxf;
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| 271 |
lastrno = r->rno;
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| 272 |
eclock++; /* notify expression evaluator */
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| 273 |
return(1);
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| 274 |
}
|
| 275 |
|
| 276 |
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| 277 |
void
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| 278 |
loadfunc( /* load definition file */
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| 279 |
char *fname
|
| 280 |
)
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| 281 |
{
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| 282 |
char *ffname;
|
| 283 |
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| 284 |
if ((ffname = getpath(fname, getrlibpath(), R_OK)) == NULL) {
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| 285 |
sprintf(errmsg, "cannot find function file \"%s\"", fname);
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| 286 |
error(SYSTEM, errmsg);
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| 287 |
}
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| 288 |
fcompile(ffname);
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| 289 |
}
|
| 290 |
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| 291 |
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| 292 |
static double
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| 293 |
l_arg(char *nm) /* return nth real argument */
|
| 294 |
{
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| 295 |
int n;
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| 296 |
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| 297 |
if (fobj == NULL)
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| 298 |
error(USER,
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| 299 |
"bad call to arg(n) - illegal constant in .cal file?");
|
| 300 |
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| 301 |
n = argument(1) + .5; /* round to integer */
|
| 302 |
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| 303 |
if (n < 1)
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| 304 |
return(fobj->oargs.nfargs);
|
| 305 |
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| 306 |
if (n > fobj->oargs.nfargs) {
|
| 307 |
sprintf(errmsg, "missing real argument %d", n);
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| 308 |
objerror(fobj, USER, errmsg);
|
| 309 |
}
|
| 310 |
return(fobj->oargs.farg[n-1]);
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| 311 |
}
|
| 312 |
|
| 313 |
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| 314 |
static double
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| 315 |
l_erf(char *nm) /* error function */
|
| 316 |
{
|
| 317 |
return(erf(argument(1)));
|
| 318 |
}
|
| 319 |
|
| 320 |
|
| 321 |
static double
|
| 322 |
l_erfc(char *nm) /* cumulative error function */
|
| 323 |
{
|
| 324 |
return(erfc(argument(1)));
|
| 325 |
}
|
| 326 |
|
| 327 |
|
| 328 |
double
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| 329 |
chanvalue( /* return channel n to calcomp */
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| 330 |
int n
|
| 331 |
)
|
| 332 |
{
|
| 333 |
if (fray == NULL)
|
| 334 |
esyntax("ray parameter used in constant expression");
|
| 335 |
|
| 336 |
if (--n < 0)
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| 337 |
goto badchan;
|
| 338 |
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| 339 |
if (n < 3) /* ray direction */
|
| 340 |
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| 341 |
return( ( fray->rdir[0]*funcxf.xfm[0][n] +
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| 342 |
fray->rdir[1]*funcxf.xfm[1][n] +
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| 343 |
fray->rdir[2]*funcxf.xfm[2][n] )
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| 344 |
/ funcxf.sca );
|
| 345 |
|
| 346 |
if (n < 6) /* surface normal */
|
| 347 |
|
| 348 |
return( ( fray->ron[0]*funcxf.xfm[0][n-3] +
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| 349 |
fray->ron[1]*funcxf.xfm[1][n-3] +
|
| 350 |
fray->ron[2]*funcxf.xfm[2][n-3] )
|
| 351 |
/ funcxf.sca );
|
| 352 |
|
| 353 |
if (n < 9) /* intersection point */
|
| 354 |
|
| 355 |
return( fray->rop[0]*funcxf.xfm[0][n-6] +
|
| 356 |
fray->rop[1]*funcxf.xfm[1][n-6] +
|
| 357 |
fray->rop[2]*funcxf.xfm[2][n-6] +
|
| 358 |
funcxf.xfm[3][n-6] );
|
| 359 |
|
| 360 |
if (n == 9) /* total distance */
|
| 361 |
return(raydist(fray,PRIMARY) * funcxf.sca);
|
| 362 |
|
| 363 |
if (n == 10) /* dot product (range [-1,1]) */
|
| 364 |
return( fray->rod <= -1.0 ? -1.0 :
|
| 365 |
fray->rod >= 1.0 ? 1.0 :
|
| 366 |
fray->rod );
|
| 367 |
|
| 368 |
if (n == 11) /* scale */
|
| 369 |
return(funcxf.sca);
|
| 370 |
|
| 371 |
if (n < 15) /* origin */
|
| 372 |
return(funcxf.xfm[3][n-12]);
|
| 373 |
|
| 374 |
if (n < 18) /* i unit vector */
|
| 375 |
return(funcxf.xfm[0][n-15] / funcxf.sca);
|
| 376 |
|
| 377 |
if (n < 21) /* j unit vector */
|
| 378 |
return(funcxf.xfm[1][n-18] / funcxf.sca);
|
| 379 |
|
| 380 |
if (n < 24) /* k unit vector */
|
| 381 |
return(funcxf.xfm[2][n-21] / funcxf.sca);
|
| 382 |
|
| 383 |
if (n == 24) /* single ray (shadow) distance */
|
| 384 |
return((fray->rot+raydist(fray->parent,SHADOW)) * funcxf.sca);
|
| 385 |
|
| 386 |
if (n < 27) /* local (u,v) coordinates */
|
| 387 |
return(fray->uv[n-25]);
|
| 388 |
badchan:
|
| 389 |
error(USER, "illegal channel number");
|
| 390 |
return(0.0);
|
| 391 |
}
|
