1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: func.c,v 2.32 2016/04/27 21:11:32 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* func.c - interface to calcomp functions. |
6 |
*/ |
7 |
|
8 |
#include "copyright.h" |
9 |
|
10 |
#include "ray.h" |
11 |
#include "paths.h" |
12 |
#include "otypes.h" |
13 |
#include "func.h" |
14 |
#include <ctype.h> |
15 |
|
16 |
|
17 |
#define INITFILE "rayinit.cal" |
18 |
#define CALSUF ".cal" |
19 |
#define LCALSUF 4 |
20 |
char REFVNAME[] = "`FILE_REFCNT"; |
21 |
|
22 |
XF unitxf = { /* identity transform */ |
23 |
{{1.0, 0.0, 0.0, 0.0}, |
24 |
{0.0, 1.0, 0.0, 0.0}, |
25 |
{0.0, 0.0, 1.0, 0.0}, |
26 |
{0.0, 0.0, 0.0, 1.0}}, |
27 |
1.0 |
28 |
}; |
29 |
|
30 |
XF funcxf; /* current transformation */ |
31 |
static OBJREC *fobj = NULL; /* current function object */ |
32 |
static RAY *fray = NULL; /* current function ray */ |
33 |
|
34 |
static char rayinitcal[] = INITFILE; |
35 |
|
36 |
static double l_erf(char *), l_erfc(char *), l_arg(char *); |
37 |
|
38 |
|
39 |
void |
40 |
initfunc(void) /* initialize function evaluation */ |
41 |
{ |
42 |
if (!rayinitcal[0]) /* already done? */ |
43 |
return; |
44 |
esupport |= E_VARIABLE|E_FUNCTION|E_INCHAN|E_RCONST|E_REDEFW; |
45 |
esupport &= ~(E_OUTCHAN); |
46 |
setcontext(""); |
47 |
scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0); |
48 |
scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0); |
49 |
scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0); |
50 |
scompile("T=$10;Ts=$25;Rdot=$11;", NULL, 0); |
51 |
scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0); |
52 |
scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0); |
53 |
scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0); |
54 |
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(rayinitcal); |
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rayinitcal[0] = '\0'; |
63 |
} |
64 |
|
65 |
|
66 |
/* Set parameters for current evaluation */ |
67 |
void |
68 |
set_eparams(char *prms) |
69 |
{ |
70 |
static char *last_params; |
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static int lplen = 0; |
72 |
int len; |
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char vname[RMAXWORD]; |
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double value; |
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char *cpd; |
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/* check if already set */ |
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if (prms == NULL || !*prms) |
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return; |
79 |
if (lplen && !strcmp(prms, last_params)) |
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return; |
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len = strlen(prms); /* record new settings */ |
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if ((lplen != 0) & (lplen <= len)) { |
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free(last_params); |
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lplen = 0; |
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} |
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if (!lplen) { |
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lplen = len + 100; |
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last_params = (char *)malloc(lplen); |
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if (last_params == NULL) |
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error(SYSTEM, "out of memory in set_eparams()"); |
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} |
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strcpy(last_params, prms); |
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/* assign each variable */ |
94 |
while (*prms) { |
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if (isspace(*prms)) { |
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++prms; continue; |
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} |
98 |
if (!isalpha(*prms)) |
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goto bad_params; |
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cpd = vname; |
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while (*prms && (*prms != '=') & !isspace(*prms)) { |
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if (!isid(*prms) | (cpd-vname >= RMAXWORD-1)) |
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goto bad_params; |
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*cpd++ = *prms++; |
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} |
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*cpd = '\0'; |
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while (isspace(*prms)) prms++; |
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if (*prms++ != '=') |
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goto bad_params; |
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value = atof(prms); |
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if ((prms = fskip(prms)) == NULL) |
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goto bad_params; |
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while (isspace(*prms)) prms++; |
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prms += (*prms == ',') | (*prms == ';'); |
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varset(vname, '=', value); |
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} |
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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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|
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|
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MFUNC * |
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getfunc( /* get function for this modifier */ |
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OBJREC *m, |
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int ff, |
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unsigned int ef, |
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int dofwd |
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) |
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{ |
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char sbuf[MAXSTR]; |
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char **arg; |
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MFUNC *f; |
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int ne, na; |
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int i; |
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/* check to see if done already */ |
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if ((f = (MFUNC *)m->os) != NULL) |
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return(f); |
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fobj = NULL; fray = NULL; |
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if (rayinitcal[0]) /* initialize on first call */ |
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initfunc(); |
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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->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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|
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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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) |
210 |
{ |
211 |
MFUNC *f; |
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int i; |
213 |
|
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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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} |
227 |
if (f->bxp != &unitxf) |
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free((void *)f->bxp); |
229 |
if ((f->fxp != NULL) & (f->fxp != &unitxf)) |
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free((void *)f->fxp); |
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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( /* set channels for function call */ |
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OBJREC *m, |
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RAY *r |
240 |
) |
241 |
{ |
242 |
static RNUMBER lastrno = ~0; |
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MFUNC *f; |
244 |
/* get function if any */ |
245 |
if ((f = (MFUNC *)m->os) == NULL) |
246 |
objerror(m, CONSISTENCY, "setfunc called before getfunc"); |
247 |
|
248 |
setcontext(f->ctx); /* set evaluator context */ |
249 |
/* check to see if matrix set */ |
250 |
if ((m == fobj) & (r->rno == lastrno)) |
251 |
return(0); |
252 |
fobj = m; |
253 |
fray = r; |
254 |
if (r->rox != NULL) { |
255 |
if (f->bxp != &unitxf) { |
256 |
funcxf.sca = r->rox->b.sca * f->bxp->sca; |
257 |
multmat4(funcxf.xfm, r->rox->b.xfm, f->bxp->xfm); |
258 |
} else |
259 |
funcxf = r->rox->b; |
260 |
} else |
261 |
funcxf = *f->bxp; |
262 |
lastrno = r->rno; |
263 |
eclock++; /* notify expression evaluator */ |
264 |
return(1); |
265 |
} |
266 |
|
267 |
|
268 |
int |
269 |
worldfunc( /* special function context sans object */ |
270 |
char *ctx, |
271 |
RAY *r |
272 |
) |
273 |
{ |
274 |
static RNUMBER lastrno = ~0; |
275 |
|
276 |
if (rayinitcal[0]) /* initialize on first call */ |
277 |
initfunc(); |
278 |
/* set evaluator context */ |
279 |
setcontext(ctx); |
280 |
/* check if ray already set */ |
281 |
if ((fobj == NULL) & (r->rno == lastrno)) |
282 |
return(0); |
283 |
fobj = NULL; |
284 |
fray = r; |
285 |
funcxf = unitxf; |
286 |
lastrno = r->rno; |
287 |
eclock++; /* notify expression evaluator */ |
288 |
return(1); |
289 |
} |
290 |
|
291 |
|
292 |
void |
293 |
loadfunc( /* load definition file */ |
294 |
char *fname |
295 |
) |
296 |
{ |
297 |
char *ffname; |
298 |
|
299 |
if ((ffname = getpath(fname, getrlibpath(), R_OK)) == NULL) { |
300 |
sprintf(errmsg, "cannot find function file \"%s\"", fname); |
301 |
error(SYSTEM, errmsg); |
302 |
} |
303 |
fcompile(ffname); |
304 |
} |
305 |
|
306 |
|
307 |
static double |
308 |
l_arg(char *nm) /* return nth real argument */ |
309 |
{ |
310 |
int n; |
311 |
|
312 |
if (fobj == NULL) |
313 |
error(INTERNAL, "arg(n) called without a modifier context"); |
314 |
|
315 |
n = argument(1) + .5; /* round to integer */ |
316 |
|
317 |
if (n < 1) |
318 |
return(fobj->oargs.nfargs); |
319 |
|
320 |
if (n > fobj->oargs.nfargs) { |
321 |
sprintf(errmsg, "missing real argument %d", n); |
322 |
objerror(fobj, USER, errmsg); |
323 |
} |
324 |
return(fobj->oargs.farg[n-1]); |
325 |
} |
326 |
|
327 |
|
328 |
static double |
329 |
l_erf(char *nm) /* error function */ |
330 |
{ |
331 |
return(erf(argument(1))); |
332 |
} |
333 |
|
334 |
|
335 |
static double |
336 |
l_erfc(char *nm) /* cumulative error function */ |
337 |
{ |
338 |
return(erfc(argument(1))); |
339 |
} |
340 |
|
341 |
|
342 |
double |
343 |
chanvalue( /* return channel n to calcomp */ |
344 |
int n |
345 |
) |
346 |
{ |
347 |
if (fray == NULL) |
348 |
syntax("ray parameter used in constant expression"); |
349 |
|
350 |
if (--n < 0) |
351 |
goto badchan; |
352 |
|
353 |
if (n <= 2) /* ray direction */ |
354 |
|
355 |
return( ( fray->rdir[0]*funcxf.xfm[0][n] + |
356 |
fray->rdir[1]*funcxf.xfm[1][n] + |
357 |
fray->rdir[2]*funcxf.xfm[2][n] ) |
358 |
/ funcxf.sca ); |
359 |
|
360 |
if (n <= 5) /* surface normal */ |
361 |
|
362 |
return( ( fray->ron[0]*funcxf.xfm[0][n-3] + |
363 |
fray->ron[1]*funcxf.xfm[1][n-3] + |
364 |
fray->ron[2]*funcxf.xfm[2][n-3] ) |
365 |
/ funcxf.sca ); |
366 |
|
367 |
if (n <= 8) { /* intersection point */ |
368 |
if (fray->rot >= FHUGE) |
369 |
return(0.0); /* XXX should be runtime error? */ |
370 |
|
371 |
return( fray->rop[0]*funcxf.xfm[0][n-6] + |
372 |
fray->rop[1]*funcxf.xfm[1][n-6] + |
373 |
fray->rop[2]*funcxf.xfm[2][n-6] + |
374 |
funcxf.xfm[3][n-6] ); |
375 |
} |
376 |
|
377 |
if (n == 9) /* total distance */ |
378 |
return(raydist(fray,PRIMARY) * funcxf.sca); |
379 |
|
380 |
if (n == 10) /* dot product (range [-1,1]) */ |
381 |
return( fray->rod <= -1.0 ? -1.0 : |
382 |
fray->rod >= 1.0 ? 1.0 : |
383 |
fray->rod ); |
384 |
|
385 |
if (n == 11) /* scale */ |
386 |
return(funcxf.sca); |
387 |
|
388 |
if (n <= 14) /* origin */ |
389 |
return(funcxf.xfm[3][n-12]); |
390 |
|
391 |
if (n <= 17) /* i unit vector */ |
392 |
return(funcxf.xfm[0][n-15] / funcxf.sca); |
393 |
|
394 |
if (n <= 20) /* j unit vector */ |
395 |
return(funcxf.xfm[1][n-18] / funcxf.sca); |
396 |
|
397 |
if (n <= 23) /* k unit vector */ |
398 |
return(funcxf.xfm[2][n-21] / funcxf.sca); |
399 |
|
400 |
if (n == 24) /* single ray (shadow) distance */ |
401 |
return((fray->rot+raydist(fray->parent,SHADOW)) * funcxf.sca); |
402 |
|
403 |
if (n <= 26) /* local (u,v) coordinates */ |
404 |
return(fray->uv[n-25]); |
405 |
badchan: |
406 |
error(USER, "illegal channel number"); |
407 |
return(0.0); |
408 |
} |