| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: func.c,v 2.30 2015/05/20 13:16:20 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() /* 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); |
| 55 |
scompile("Lu=$26;Lv=$27;", NULL, 0); |
| 56 |
funset("arg", 1, '=', l_arg); |
| 57 |
funset("erf", 1, ':', l_erf); |
| 58 |
funset("erfc", 1, ':', l_erfc); |
| 59 |
setnoisefuncs(); |
| 60 |
setprismfuncs(); |
| 61 |
loadfunc(rayinitcal); |
| 62 |
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 = NULL; |
| 71 |
char vname[RMAXWORD]; |
| 72 |
double value; |
| 73 |
char *cpd; |
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/* check if already set */ |
| 75 |
if ((prms == NULL) | (prms == last_params)) |
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return; |
| 77 |
if (last_params != NULL && !strcmp(prms, last_params)) |
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return; |
| 79 |
last_params = prms; /* assign each variable */ |
| 80 |
while (*prms) { |
| 81 |
if (isspace(*prms)) { |
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++prms; continue; |
| 83 |
} |
| 84 |
if (!isalpha(*prms)) |
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goto bad_params; |
| 86 |
cpd = vname; |
| 87 |
while (*prms && (*prms != '=') & !isspace(*prms)) { |
| 88 |
if (!isid(*prms) | (cpd-vname >= RMAXWORD-1)) |
| 89 |
goto bad_params; |
| 90 |
*cpd++ = *prms++; |
| 91 |
} |
| 92 |
if (cpd == vname) |
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goto bad_params; |
| 94 |
*cpd = '\0'; |
| 95 |
while (isspace(*prms)) prms++; |
| 96 |
if (*prms++ != '=') |
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goto bad_params; |
| 98 |
value = atof(prms); |
| 99 |
if ((prms = fskip(prms)) == NULL) |
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goto bad_params; |
| 101 |
while (isspace(*prms)) prms++; |
| 102 |
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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) |
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{ |
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MFUNC *f; |
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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->bxp != &unitxf) |
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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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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 |
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) |
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{ |
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static RNUMBER lastrno = ~0; |
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MFUNC *f; |
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/* get function if any */ |
| 233 |
if ((f = (MFUNC *)m->os) == NULL) |
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objerror(m, CONSISTENCY, "setfunc called before getfunc"); |
| 235 |
|
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setcontext(f->ctx); /* set evaluator context */ |
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/* check to see if matrix set */ |
| 238 |
if ((m == fobj) & (r->rno == lastrno)) |
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return(0); |
| 240 |
fobj = m; |
| 241 |
fray = r; |
| 242 |
if (r->rox != NULL) { |
| 243 |
if (f->bxp != &unitxf) { |
| 244 |
funcxf.sca = r->rox->b.sca * f->bxp->sca; |
| 245 |
multmat4(funcxf.xfm, r->rox->b.xfm, f->bxp->xfm); |
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} else |
| 247 |
funcxf = r->rox->b; |
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} else |
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funcxf = *f->bxp; |
| 250 |
lastrno = r->rno; |
| 251 |
eclock++; /* notify expression evaluator */ |
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return(1); |
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} |
| 254 |
|
| 255 |
|
| 256 |
int |
| 257 |
worldfunc( /* special function context sans object */ |
| 258 |
char *ctx, |
| 259 |
RAY *r |
| 260 |
) |
| 261 |
{ |
| 262 |
static RNUMBER lastrno = ~0; |
| 263 |
|
| 264 |
if (rayinitcal[0]) /* initialize on first call */ |
| 265 |
initfunc(); |
| 266 |
/* set evaluator context */ |
| 267 |
setcontext(ctx); |
| 268 |
/* check if ray already set */ |
| 269 |
if ((fobj == NULL) & (r->rno == lastrno)) |
| 270 |
return(0); |
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fobj = NULL; |
| 272 |
fray = r; |
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funcxf = unitxf; |
| 274 |
lastrno = r->rno; |
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eclock++; /* notify expression evaluator */ |
| 276 |
return(1); |
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} |
| 278 |
|
| 279 |
|
| 280 |
void |
| 281 |
loadfunc( /* load definition file */ |
| 282 |
char *fname |
| 283 |
) |
| 284 |
{ |
| 285 |
char *ffname; |
| 286 |
|
| 287 |
if ((ffname = getpath(fname, getrlibpath(), R_OK)) == NULL) { |
| 288 |
sprintf(errmsg, "cannot find function file \"%s\"", fname); |
| 289 |
error(SYSTEM, errmsg); |
| 290 |
} |
| 291 |
fcompile(ffname); |
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} |
| 293 |
|
| 294 |
|
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static double |
| 296 |
l_arg(char *nm) /* return nth real argument */ |
| 297 |
{ |
| 298 |
int n; |
| 299 |
|
| 300 |
if (fobj == NULL) |
| 301 |
error(INTERNAL, "arg(n) called without a modifier context"); |
| 302 |
|
| 303 |
n = argument(1) + .5; /* round to integer */ |
| 304 |
|
| 305 |
if (n < 1) |
| 306 |
return(fobj->oargs.nfargs); |
| 307 |
|
| 308 |
if (n > fobj->oargs.nfargs) { |
| 309 |
sprintf(errmsg, "missing real argument %d", n); |
| 310 |
objerror(fobj, USER, errmsg); |
| 311 |
} |
| 312 |
return(fobj->oargs.farg[n-1]); |
| 313 |
} |
| 314 |
|
| 315 |
|
| 316 |
static double |
| 317 |
l_erf(char *nm) /* error function */ |
| 318 |
{ |
| 319 |
return(erf(argument(1))); |
| 320 |
} |
| 321 |
|
| 322 |
|
| 323 |
static double |
| 324 |
l_erfc(char *nm) /* cumulative error function */ |
| 325 |
{ |
| 326 |
return(erfc(argument(1))); |
| 327 |
} |
| 328 |
|
| 329 |
|
| 330 |
double |
| 331 |
chanvalue( /* return channel n to calcomp */ |
| 332 |
int n |
| 333 |
) |
| 334 |
{ |
| 335 |
if (fray == NULL) |
| 336 |
syntax("ray parameter used in constant expression"); |
| 337 |
|
| 338 |
if (--n < 0) |
| 339 |
goto badchan; |
| 340 |
|
| 341 |
if (n <= 2) /* ray direction */ |
| 342 |
|
| 343 |
return( ( fray->rdir[0]*funcxf.xfm[0][n] + |
| 344 |
fray->rdir[1]*funcxf.xfm[1][n] + |
| 345 |
fray->rdir[2]*funcxf.xfm[2][n] ) |
| 346 |
/ funcxf.sca ); |
| 347 |
|
| 348 |
if (n <= 5) /* surface normal */ |
| 349 |
|
| 350 |
return( ( fray->ron[0]*funcxf.xfm[0][n-3] + |
| 351 |
fray->ron[1]*funcxf.xfm[1][n-3] + |
| 352 |
fray->ron[2]*funcxf.xfm[2][n-3] ) |
| 353 |
/ funcxf.sca ); |
| 354 |
|
| 355 |
if (n <= 8) { /* intersection point */ |
| 356 |
if (fray->rot >= FHUGE) |
| 357 |
return(0.0); /* XXX should be runtime error? */ |
| 358 |
|
| 359 |
return( fray->rop[0]*funcxf.xfm[0][n-6] + |
| 360 |
fray->rop[1]*funcxf.xfm[1][n-6] + |
| 361 |
fray->rop[2]*funcxf.xfm[2][n-6] + |
| 362 |
funcxf.xfm[3][n-6] ); |
| 363 |
} |
| 364 |
|
| 365 |
if (n == 9) /* total distance */ |
| 366 |
return(raydist(fray,PRIMARY) * funcxf.sca); |
| 367 |
|
| 368 |
if (n == 10) /* dot product (range [-1,1]) */ |
| 369 |
return( fray->rod <= -1.0 ? -1.0 : |
| 370 |
fray->rod >= 1.0 ? 1.0 : |
| 371 |
fray->rod ); |
| 372 |
|
| 373 |
if (n == 11) /* scale */ |
| 374 |
return(funcxf.sca); |
| 375 |
|
| 376 |
if (n <= 14) /* origin */ |
| 377 |
return(funcxf.xfm[3][n-12]); |
| 378 |
|
| 379 |
if (n <= 17) /* i unit vector */ |
| 380 |
return(funcxf.xfm[0][n-15] / funcxf.sca); |
| 381 |
|
| 382 |
if (n <= 20) /* j unit vector */ |
| 383 |
return(funcxf.xfm[1][n-18] / funcxf.sca); |
| 384 |
|
| 385 |
if (n <= 23) /* k unit vector */ |
| 386 |
return(funcxf.xfm[2][n-21] / funcxf.sca); |
| 387 |
|
| 388 |
if (n == 24) /* single ray (shadow) distance */ |
| 389 |
return((fray->rot+raydist(fray->parent,SHADOW)) * funcxf.sca); |
| 390 |
|
| 391 |
if (n <= 26) /* local (u,v) coordinates */ |
| 392 |
return(fray->uv[n-25]); |
| 393 |
badchan: |
| 394 |
error(USER, "illegal channel number"); |
| 395 |
return(0.0); |
| 396 |
} |
