1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.29 |
static const char RCSid[] = "$Id: func.c,v 2.28 2015/05/19 11:49:05 greg Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
|
|
/* |
5 |
|
|
* func.c - interface to calcomp functions. |
6 |
greg |
2.14 |
*/ |
7 |
|
|
|
8 |
greg |
2.15 |
#include "copyright.h" |
9 |
greg |
1.1 |
|
10 |
|
|
#include "ray.h" |
11 |
greg |
2.21 |
#include "paths.h" |
12 |
greg |
1.1 |
#include "otypes.h" |
13 |
greg |
2.2 |
#include "func.h" |
14 |
greg |
1.1 |
|
15 |
greg |
2.2 |
|
16 |
greg |
1.21 |
#define INITFILE "rayinit.cal" |
17 |
greg |
2.2 |
#define CALSUF ".cal" |
18 |
|
|
#define LCALSUF 4 |
19 |
greg |
2.10 |
char REFVNAME[] = "`FILE_REFCNT"; |
20 |
greg |
1.21 |
|
21 |
greg |
1.13 |
XF unitxf = { /* identity transform */ |
22 |
greg |
2.8 |
{{1.0, 0.0, 0.0, 0.0}, |
23 |
|
|
{0.0, 1.0, 0.0, 0.0}, |
24 |
|
|
{0.0, 0.0, 1.0, 0.0}, |
25 |
|
|
{0.0, 0.0, 0.0, 1.0}}, |
26 |
greg |
1.13 |
1.0 |
27 |
|
|
}; |
28 |
|
|
|
29 |
greg |
1.12 |
XF funcxf; /* current transformation */ |
30 |
|
|
static OBJREC *fobj = NULL; /* current function object */ |
31 |
|
|
static RAY *fray = NULL; /* current function ray */ |
32 |
greg |
1.1 |
|
33 |
greg |
2.26 |
static char rayinitcal[] = INITFILE; |
34 |
|
|
|
35 |
greg |
2.20 |
static double l_erf(char *), l_erfc(char *), l_arg(char *); |
36 |
greg |
1.1 |
|
37 |
greg |
2.2 |
|
38 |
greg |
2.26 |
void |
39 |
|
|
initfunc() /* initialize function evaluation */ |
40 |
|
|
{ |
41 |
|
|
if (!rayinitcal[0]) /* already done? */ |
42 |
|
|
return; |
43 |
|
|
esupport |= E_VARIABLE|E_FUNCTION|E_INCHAN|E_RCONST|E_REDEFW; |
44 |
|
|
esupport &= ~(E_OUTCHAN); |
45 |
|
|
setcontext(""); |
46 |
|
|
scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0); |
47 |
|
|
scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0); |
48 |
|
|
scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0); |
49 |
|
|
scompile("T=$10;Ts=$25;Rdot=$11;", NULL, 0); |
50 |
|
|
scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0); |
51 |
|
|
scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0); |
52 |
|
|
scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0); |
53 |
|
|
scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0); |
54 |
|
|
scompile("Lu=$26;Lv=$27;", NULL, 0); |
55 |
|
|
funset("arg", 1, '=', l_arg); |
56 |
|
|
funset("erf", 1, ':', l_erf); |
57 |
|
|
funset("erfc", 1, ':', l_erfc); |
58 |
|
|
setnoisefuncs(); |
59 |
|
|
setprismfuncs(); |
60 |
|
|
loadfunc(rayinitcal); |
61 |
|
|
rayinitcal[0] = '\0'; |
62 |
|
|
} |
63 |
|
|
|
64 |
|
|
|
65 |
greg |
2.29 |
/* Set parameters for current evaluation */ |
66 |
|
|
void |
67 |
|
|
set_eparams(char *prms) |
68 |
|
|
{ |
69 |
|
|
static char *last_params = NULL; |
70 |
|
|
char vname[RMAXWORD]; |
71 |
|
|
double value; |
72 |
|
|
char *cpd; |
73 |
|
|
/* check if already set */ |
74 |
|
|
if ((prms == NULL) | (prms == last_params)) |
75 |
|
|
return; |
76 |
|
|
if (last_params != NULL && !strcmp(prms, last_params)) |
77 |
|
|
return; |
78 |
|
|
last_params = prms; /* assign each variable */ |
79 |
|
|
while (*prms) { |
80 |
|
|
if (isspace(*prms)) { |
81 |
|
|
++prms; continue; |
82 |
|
|
} |
83 |
|
|
if (!isalpha(*prms)) |
84 |
|
|
goto bad_params; |
85 |
|
|
cpd = vname; |
86 |
|
|
while (*prms && (*prms != '=') & !isspace(*prms)) { |
87 |
|
|
if (!isid(*prms)) |
88 |
|
|
goto bad_params; |
89 |
|
|
*cpd++ = *prms++; |
90 |
|
|
} |
91 |
|
|
if (cpd == vname) |
92 |
|
|
goto bad_params; |
93 |
|
|
*cpd = '\0'; |
94 |
|
|
while (isspace(*prms)) prms++; |
95 |
|
|
if (*prms++ != '=') |
96 |
|
|
goto bad_params; |
97 |
|
|
value = atof(prms); |
98 |
|
|
if ((prms = fskip(prms)) == NULL) |
99 |
|
|
goto bad_params; |
100 |
|
|
while (isspace(*prms)) prms++; |
101 |
|
|
prms += (*prms == ',') | (*prms == ';'); |
102 |
|
|
varset(vname, '=', value); |
103 |
|
|
} |
104 |
|
|
return; |
105 |
|
|
bad_params: |
106 |
|
|
sprintf(errmsg, "bad parameter list '%s'", last_params); |
107 |
|
|
error(USER, errmsg); |
108 |
|
|
} |
109 |
|
|
|
110 |
|
|
|
111 |
greg |
2.25 |
MFUNC * |
112 |
schorsch |
2.22 |
getfunc( /* get function for this modifier */ |
113 |
|
|
OBJREC *m, |
114 |
|
|
int ff, |
115 |
|
|
unsigned int ef, |
116 |
|
|
int dofwd |
117 |
|
|
) |
118 |
greg |
2.2 |
{ |
119 |
|
|
char sbuf[MAXSTR]; |
120 |
greg |
2.25 |
char **arg; |
121 |
|
|
MFUNC *f; |
122 |
greg |
2.2 |
int ne, na; |
123 |
greg |
2.25 |
int i; |
124 |
greg |
2.2 |
/* check to see if done already */ |
125 |
|
|
if ((f = (MFUNC *)m->os) != NULL) |
126 |
|
|
return(f); |
127 |
greg |
2.7 |
fobj = NULL; fray = NULL; |
128 |
greg |
2.26 |
if (rayinitcal[0]) /* initialize on first call */ |
129 |
|
|
initfunc(); |
130 |
greg |
2.2 |
if ((na = m->oargs.nsargs) <= ff) |
131 |
|
|
goto toofew; |
132 |
|
|
arg = m->oargs.sarg; |
133 |
|
|
if ((f = (MFUNC *)calloc(1, sizeof(MFUNC))) == NULL) |
134 |
|
|
goto memerr; |
135 |
|
|
i = strlen(arg[ff]); /* set up context */ |
136 |
greg |
2.26 |
if (i == 1 && arg[ff][0] == '.') { |
137 |
greg |
2.2 |
setcontext(f->ctx = ""); /* "." means no file */ |
138 |
greg |
2.26 |
} else { |
139 |
greg |
2.14 |
strcpy(sbuf,arg[ff]); /* file name is context */ |
140 |
greg |
2.2 |
if (i > LCALSUF && !strcmp(sbuf+i-LCALSUF, CALSUF)) |
141 |
|
|
sbuf[i-LCALSUF] = '\0'; /* remove suffix */ |
142 |
|
|
setcontext(f->ctx = savestr(sbuf)); |
143 |
|
|
if (!vardefined(REFVNAME)) { /* file loaded? */ |
144 |
greg |
2.5 |
loadfunc(arg[ff]); |
145 |
greg |
2.2 |
varset(REFVNAME, '=', 1.0); |
146 |
|
|
} else /* reference_count++ */ |
147 |
|
|
varset(REFVNAME, '=', varvalue(REFVNAME)+1.0); |
148 |
|
|
} |
149 |
|
|
curfunc = NULL; /* parse expressions */ |
150 |
|
|
sprintf(sbuf, "%s \"%s\"", ofun[m->otype].funame, m->oname); |
151 |
|
|
for (i=0, ne=0; ef && i < na; i++, ef>>=1) |
152 |
|
|
if (ef & 1) { /* flagged as an expression? */ |
153 |
|
|
if (ne >= MAXEXPR) |
154 |
|
|
objerror(m, INTERNAL, "too many expressions"); |
155 |
|
|
initstr(arg[i], sbuf, 0); |
156 |
|
|
f->ep[ne++] = getE1(); |
157 |
|
|
if (nextc != EOF) |
158 |
|
|
syntax("unexpected character"); |
159 |
|
|
} |
160 |
|
|
if (ef) |
161 |
|
|
goto toofew; |
162 |
|
|
if (i <= ff) /* find transform args */ |
163 |
|
|
i = ff+1; |
164 |
|
|
while (i < na && arg[i][0] != '-') |
165 |
|
|
i++; |
166 |
greg |
2.26 |
if (i == na) { /* no transform */ |
167 |
|
|
f->fxp = f->bxp = &unitxf; |
168 |
|
|
} else { /* get transform */ |
169 |
|
|
if ((f->bxp = (XF *)malloc(sizeof(XF))) == NULL) |
170 |
greg |
2.3 |
goto memerr; |
171 |
greg |
2.26 |
if (invxf(f->bxp, na-i, arg+i) != na-i) |
172 |
greg |
2.2 |
objerror(m, USER, "bad transform"); |
173 |
greg |
2.26 |
if (f->bxp->sca < 0.0) |
174 |
|
|
f->bxp->sca = -f->bxp->sca; |
175 |
greg |
2.2 |
if (dofwd) { /* do both transforms */ |
176 |
greg |
2.26 |
if ((f->fxp = (XF *)malloc(sizeof(XF))) == NULL) |
177 |
greg |
2.3 |
goto memerr; |
178 |
greg |
2.26 |
xf(f->fxp, na-i, arg+i); |
179 |
|
|
if (f->fxp->sca < 0.0) |
180 |
|
|
f->fxp->sca = -f->fxp->sca; |
181 |
greg |
2.2 |
} |
182 |
|
|
} |
183 |
|
|
m->os = (char *)f; |
184 |
|
|
return(f); |
185 |
|
|
toofew: |
186 |
greg |
2.4 |
objerror(m, USER, "too few string arguments"); |
187 |
greg |
2.2 |
memerr: |
188 |
|
|
error(SYSTEM, "out of memory in getfunc"); |
189 |
schorsch |
2.22 |
return NULL; /* pro forma return */ |
190 |
greg |
2.2 |
} |
191 |
|
|
|
192 |
|
|
|
193 |
greg |
2.25 |
void |
194 |
schorsch |
2.22 |
freefunc( /* free memory associated with modifier */ |
195 |
|
|
OBJREC *m |
196 |
|
|
) |
197 |
greg |
2.2 |
{ |
198 |
greg |
2.25 |
MFUNC *f; |
199 |
|
|
int i; |
200 |
greg |
2.2 |
|
201 |
|
|
if ((f = (MFUNC *)m->os) == NULL) |
202 |
|
|
return; |
203 |
|
|
for (i = 0; f->ep[i] != NULL; i++) |
204 |
|
|
epfree(f->ep[i]); |
205 |
|
|
if (f->ctx[0]) { /* done with definitions */ |
206 |
|
|
setcontext(f->ctx); |
207 |
|
|
i = varvalue(REFVNAME)-.5; /* reference_count-- */ |
208 |
|
|
if (i > 0) |
209 |
|
|
varset(REFVNAME, '=', (double)i); |
210 |
|
|
else |
211 |
|
|
dcleanup(2); /* remove definitions */ |
212 |
|
|
freestr(f->ctx); |
213 |
|
|
} |
214 |
greg |
2.26 |
if (f->bxp != &unitxf) |
215 |
|
|
free((void *)f->bxp); |
216 |
|
|
if ((f->fxp != NULL) & (f->fxp != &unitxf)) |
217 |
|
|
free((void *)f->fxp); |
218 |
greg |
2.14 |
free((void *)f); |
219 |
greg |
2.2 |
m->os = NULL; |
220 |
|
|
} |
221 |
|
|
|
222 |
|
|
|
223 |
greg |
2.25 |
int |
224 |
schorsch |
2.22 |
setfunc( /* set channels for function call */ |
225 |
greg |
2.26 |
OBJREC *m, |
226 |
|
|
RAY *r |
227 |
schorsch |
2.22 |
) |
228 |
greg |
1.1 |
{ |
229 |
greg |
2.26 |
static RNUMBER lastrno = ~0; |
230 |
|
|
MFUNC *f; |
231 |
greg |
2.25 |
/* get function if any */ |
232 |
greg |
2.26 |
if ((f = (MFUNC *)m->os) == NULL) |
233 |
|
|
objerror(m, CONSISTENCY, "setfunc called before getfunc"); |
234 |
|
|
|
235 |
|
|
setcontext(f->ctx); /* set evaluator context */ |
236 |
greg |
2.2 |
/* check to see if matrix set */ |
237 |
greg |
2.25 |
if ((m == fobj) & (r->rno == lastrno)) |
238 |
greg |
1.17 |
return(0); |
239 |
greg |
1.1 |
fobj = m; |
240 |
|
|
fray = r; |
241 |
greg |
2.26 |
if (r->rox != NULL) { |
242 |
|
|
if (f->bxp != &unitxf) { |
243 |
|
|
funcxf.sca = r->rox->b.sca * f->bxp->sca; |
244 |
|
|
multmat4(funcxf.xfm, r->rox->b.xfm, f->bxp->xfm); |
245 |
greg |
1.13 |
} else |
246 |
schorsch |
2.19 |
funcxf = r->rox->b; |
247 |
greg |
2.26 |
} else |
248 |
|
|
funcxf = *f->bxp; |
249 |
|
|
lastrno = r->rno; |
250 |
|
|
eclock++; /* notify expression evaluator */ |
251 |
|
|
return(1); |
252 |
|
|
} |
253 |
|
|
|
254 |
|
|
|
255 |
|
|
int |
256 |
|
|
worldfunc( /* special function context sans object */ |
257 |
|
|
char *ctx, |
258 |
|
|
RAY *r |
259 |
|
|
) |
260 |
|
|
{ |
261 |
|
|
static RNUMBER lastrno = ~0; |
262 |
greg |
2.27 |
|
263 |
|
|
if (rayinitcal[0]) /* initialize on first call */ |
264 |
|
|
initfunc(); |
265 |
greg |
2.26 |
/* set evaluator context */ |
266 |
|
|
setcontext(ctx); |
267 |
|
|
/* check if ray already set */ |
268 |
|
|
if ((fobj == NULL) & (r->rno == lastrno)) |
269 |
|
|
return(0); |
270 |
|
|
fobj = NULL; |
271 |
|
|
fray = r; |
272 |
|
|
funcxf = unitxf; |
273 |
greg |
1.16 |
lastrno = r->rno; |
274 |
greg |
1.1 |
eclock++; /* notify expression evaluator */ |
275 |
greg |
1.17 |
return(1); |
276 |
greg |
1.1 |
} |
277 |
|
|
|
278 |
|
|
|
279 |
greg |
2.25 |
void |
280 |
schorsch |
2.22 |
loadfunc( /* load definition file */ |
281 |
|
|
char *fname |
282 |
|
|
) |
283 |
greg |
1.1 |
{ |
284 |
|
|
char *ffname; |
285 |
|
|
|
286 |
greg |
2.18 |
if ((ffname = getpath(fname, getrlibpath(), R_OK)) == NULL) { |
287 |
greg |
1.1 |
sprintf(errmsg, "cannot find function file \"%s\"", fname); |
288 |
|
|
error(USER, errmsg); |
289 |
|
|
} |
290 |
|
|
fcompile(ffname); |
291 |
|
|
} |
292 |
|
|
|
293 |
|
|
|
294 |
greg |
2.2 |
static double |
295 |
greg |
2.20 |
l_arg(char *nm) /* return nth real argument */ |
296 |
greg |
1.1 |
{ |
297 |
greg |
2.25 |
int n; |
298 |
greg |
1.1 |
|
299 |
greg |
2.7 |
if (fobj == NULL) |
300 |
greg |
2.25 |
error(USER, "arg(n) called without a context"); |
301 |
greg |
2.7 |
|
302 |
greg |
1.1 |
n = argument(1) + .5; /* round to integer */ |
303 |
|
|
|
304 |
|
|
if (n < 1) |
305 |
|
|
return(fobj->oargs.nfargs); |
306 |
|
|
|
307 |
|
|
if (n > fobj->oargs.nfargs) { |
308 |
|
|
sprintf(errmsg, "missing real argument %d", n); |
309 |
|
|
objerror(fobj, USER, errmsg); |
310 |
|
|
} |
311 |
|
|
return(fobj->oargs.farg[n-1]); |
312 |
greg |
1.19 |
} |
313 |
|
|
|
314 |
|
|
|
315 |
greg |
2.2 |
static double |
316 |
greg |
2.20 |
l_erf(char *nm) /* error function */ |
317 |
greg |
1.19 |
{ |
318 |
|
|
return(erf(argument(1))); |
319 |
|
|
} |
320 |
|
|
|
321 |
|
|
|
322 |
greg |
2.2 |
static double |
323 |
greg |
2.20 |
l_erfc(char *nm) /* cumulative error function */ |
324 |
greg |
1.19 |
{ |
325 |
|
|
return(erfc(argument(1))); |
326 |
greg |
1.1 |
} |
327 |
|
|
|
328 |
|
|
|
329 |
greg |
2.25 |
double |
330 |
schorsch |
2.22 |
chanvalue( /* return channel n to calcomp */ |
331 |
greg |
2.25 |
int n |
332 |
schorsch |
2.22 |
) |
333 |
greg |
1.1 |
{ |
334 |
greg |
2.7 |
if (fray == NULL) |
335 |
|
|
syntax("ray parameter used in constant expression"); |
336 |
greg |
1.1 |
|
337 |
greg |
1.10 |
if (--n < 0) |
338 |
|
|
goto badchan; |
339 |
greg |
1.1 |
|
340 |
greg |
2.17 |
if (n <= 2) /* ray direction */ |
341 |
greg |
1.1 |
|
342 |
greg |
1.12 |
return( ( fray->rdir[0]*funcxf.xfm[0][n] + |
343 |
|
|
fray->rdir[1]*funcxf.xfm[1][n] + |
344 |
|
|
fray->rdir[2]*funcxf.xfm[2][n] ) |
345 |
|
|
/ funcxf.sca ); |
346 |
greg |
1.1 |
|
347 |
greg |
2.17 |
if (n <= 5) /* surface normal */ |
348 |
greg |
1.8 |
|
349 |
greg |
1.12 |
return( ( fray->ron[0]*funcxf.xfm[0][n-3] + |
350 |
|
|
fray->ron[1]*funcxf.xfm[1][n-3] + |
351 |
|
|
fray->ron[2]*funcxf.xfm[2][n-3] ) |
352 |
|
|
/ funcxf.sca ); |
353 |
greg |
1.8 |
|
354 |
greg |
2.28 |
if (n <= 8) { /* intersection point */ |
355 |
|
|
if (fray->rot >= FHUGE) |
356 |
|
|
return(0.0); /* XXX should be runtime error? */ |
357 |
greg |
1.8 |
|
358 |
greg |
1.12 |
return( fray->rop[0]*funcxf.xfm[0][n-6] + |
359 |
|
|
fray->rop[1]*funcxf.xfm[1][n-6] + |
360 |
|
|
fray->rop[2]*funcxf.xfm[2][n-6] + |
361 |
|
|
funcxf.xfm[3][n-6] ); |
362 |
greg |
2.28 |
} |
363 |
greg |
1.8 |
|
364 |
greg |
2.13 |
if (n == 9) /* total distance */ |
365 |
|
|
return(raydist(fray,PRIMARY) * funcxf.sca); |
366 |
greg |
1.10 |
|
367 |
greg |
1.18 |
if (n == 10) /* dot product (range [-1,1]) */ |
368 |
|
|
return( fray->rod <= -1.0 ? -1.0 : |
369 |
|
|
fray->rod >= 1.0 ? 1.0 : |
370 |
|
|
fray->rod ); |
371 |
greg |
1.10 |
|
372 |
greg |
1.8 |
if (n == 11) /* scale */ |
373 |
greg |
1.12 |
return(funcxf.sca); |
374 |
greg |
1.8 |
|
375 |
greg |
2.17 |
if (n <= 14) /* origin */ |
376 |
greg |
1.12 |
return(funcxf.xfm[3][n-12]); |
377 |
greg |
1.8 |
|
378 |
greg |
2.17 |
if (n <= 17) /* i unit vector */ |
379 |
greg |
1.12 |
return(funcxf.xfm[0][n-15] / funcxf.sca); |
380 |
greg |
1.8 |
|
381 |
greg |
2.17 |
if (n <= 20) /* j unit vector */ |
382 |
|
|
return(funcxf.xfm[1][n-18] / funcxf.sca); |
383 |
greg |
1.8 |
|
384 |
greg |
2.17 |
if (n <= 23) /* k unit vector */ |
385 |
greg |
1.12 |
return(funcxf.xfm[2][n-21] / funcxf.sca); |
386 |
greg |
2.6 |
|
387 |
greg |
2.17 |
if (n == 24) /* single ray (shadow) distance */ |
388 |
greg |
2.13 |
return((fray->rot+raydist(fray->parent,SHADOW)) * funcxf.sca); |
389 |
greg |
2.16 |
|
390 |
greg |
2.17 |
if (n <= 26) /* local (u,v) coordinates */ |
391 |
|
|
return(fray->uv[n-25]); |
392 |
greg |
1.10 |
badchan: |
393 |
|
|
error(USER, "illegal channel number"); |
394 |
greg |
2.16 |
return(0.0); |
395 |
greg |
1.1 |
} |