1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.14 |
static const char RCSid[] = "$Id$"; |
3 |
greg |
1.1 |
#endif |
4 |
|
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/* |
5 |
|
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* func.c - interface to calcomp functions. |
6 |
greg |
2.14 |
*/ |
7 |
|
|
|
8 |
greg |
2.15 |
#include "copyright.h" |
9 |
greg |
1.1 |
|
10 |
|
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#include "ray.h" |
11 |
|
|
|
12 |
|
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#include "otypes.h" |
13 |
|
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|
14 |
greg |
2.2 |
#include "func.h" |
15 |
greg |
1.1 |
|
16 |
greg |
2.2 |
|
17 |
greg |
1.21 |
#define INITFILE "rayinit.cal" |
18 |
greg |
2.2 |
#define CALSUF ".cal" |
19 |
|
|
#define LCALSUF 4 |
20 |
greg |
2.10 |
char REFVNAME[] = "`FILE_REFCNT"; |
21 |
greg |
1.21 |
|
22 |
greg |
1.13 |
XF unitxf = { /* identity transform */ |
23 |
greg |
2.8 |
{{1.0, 0.0, 0.0, 0.0}, |
24 |
|
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{0.0, 1.0, 0.0, 0.0}, |
25 |
|
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{0.0, 0.0, 1.0, 0.0}, |
26 |
|
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{0.0, 0.0, 0.0, 1.0}}, |
27 |
greg |
1.13 |
1.0 |
28 |
|
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}; |
29 |
|
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|
30 |
greg |
1.12 |
XF funcxf; /* current transformation */ |
31 |
|
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static OBJREC *fobj = NULL; /* current function object */ |
32 |
|
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static RAY *fray = NULL; /* current function ray */ |
33 |
greg |
1.1 |
|
34 |
greg |
2.2 |
static double l_erf(), l_erfc(), l_arg(); |
35 |
greg |
1.1 |
|
36 |
greg |
2.2 |
|
37 |
|
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MFUNC * |
38 |
|
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getfunc(m, ff, ef, dofwd) /* get function for this modifier */ |
39 |
greg |
1.1 |
OBJREC *m; |
40 |
greg |
2.2 |
int ff; |
41 |
greg |
2.14 |
unsigned int ef; |
42 |
greg |
2.2 |
int dofwd; |
43 |
|
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{ |
44 |
|
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static char initfile[] = INITFILE; |
45 |
|
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char sbuf[MAXSTR]; |
46 |
|
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register char **arg; |
47 |
|
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register MFUNC *f; |
48 |
|
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int ne, na; |
49 |
|
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register int i; |
50 |
|
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/* check to see if done already */ |
51 |
|
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if ((f = (MFUNC *)m->os) != NULL) |
52 |
|
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return(f); |
53 |
greg |
2.7 |
fobj = NULL; fray = NULL; |
54 |
greg |
2.2 |
if (initfile[0]) { /* initialize on first call */ |
55 |
greg |
2.14 |
esupport |= E_VARIABLE|E_FUNCTION|E_INCHAN|E_RCONST|E_REDEFW; |
56 |
|
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esupport &= ~(E_OUTCHAN); |
57 |
greg |
2.2 |
setcontext(""); |
58 |
|
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scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0); |
59 |
|
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scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0); |
60 |
|
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scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0); |
61 |
greg |
2.6 |
scompile("T=$10;Ts=$25;Rdot=$11;", NULL, 0); |
62 |
greg |
2.2 |
scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0); |
63 |
|
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scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0); |
64 |
|
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scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0); |
65 |
|
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scompile("Kx=$22;Ky=$23;Kz=$24;", NULL, 0); |
66 |
|
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funset("arg", 1, '=', l_arg); |
67 |
|
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funset("erf", 1, ':', l_erf); |
68 |
|
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funset("erfc", 1, ':', l_erfc); |
69 |
|
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setnoisefuncs(); |
70 |
greg |
2.11 |
setprismfuncs(); |
71 |
greg |
2.2 |
loadfunc(initfile); |
72 |
|
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initfile[0] = '\0'; |
73 |
|
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} |
74 |
|
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if ((na = m->oargs.nsargs) <= ff) |
75 |
|
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goto toofew; |
76 |
|
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arg = m->oargs.sarg; |
77 |
|
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if ((f = (MFUNC *)calloc(1, sizeof(MFUNC))) == NULL) |
78 |
|
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goto memerr; |
79 |
|
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i = strlen(arg[ff]); /* set up context */ |
80 |
|
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if (i == 1 && arg[ff][0] == '.') |
81 |
|
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setcontext(f->ctx = ""); /* "." means no file */ |
82 |
|
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else { |
83 |
greg |
2.14 |
strcpy(sbuf,arg[ff]); /* file name is context */ |
84 |
greg |
2.2 |
if (i > LCALSUF && !strcmp(sbuf+i-LCALSUF, CALSUF)) |
85 |
|
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sbuf[i-LCALSUF] = '\0'; /* remove suffix */ |
86 |
|
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setcontext(f->ctx = savestr(sbuf)); |
87 |
|
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if (!vardefined(REFVNAME)) { /* file loaded? */ |
88 |
greg |
2.5 |
loadfunc(arg[ff]); |
89 |
greg |
2.2 |
varset(REFVNAME, '=', 1.0); |
90 |
|
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} else /* reference_count++ */ |
91 |
|
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varset(REFVNAME, '=', varvalue(REFVNAME)+1.0); |
92 |
|
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} |
93 |
|
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curfunc = NULL; /* parse expressions */ |
94 |
|
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sprintf(sbuf, "%s \"%s\"", ofun[m->otype].funame, m->oname); |
95 |
|
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for (i=0, ne=0; ef && i < na; i++, ef>>=1) |
96 |
|
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if (ef & 1) { /* flagged as an expression? */ |
97 |
|
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if (ne >= MAXEXPR) |
98 |
|
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objerror(m, INTERNAL, "too many expressions"); |
99 |
|
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initstr(arg[i], sbuf, 0); |
100 |
|
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f->ep[ne++] = getE1(); |
101 |
|
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if (nextc != EOF) |
102 |
|
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syntax("unexpected character"); |
103 |
|
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} |
104 |
|
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if (ef) |
105 |
|
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goto toofew; |
106 |
|
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if (i <= ff) /* find transform args */ |
107 |
|
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i = ff+1; |
108 |
|
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while (i < na && arg[i][0] != '-') |
109 |
|
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i++; |
110 |
|
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if (i == na) /* no transform */ |
111 |
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f->f = f->b = &unitxf; |
112 |
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else { /* get transform */ |
113 |
|
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if ((f->b = (XF *)malloc(sizeof(XF))) == NULL) |
114 |
greg |
2.3 |
goto memerr; |
115 |
greg |
2.2 |
if (invxf(f->b, na-i, arg+i) != na-i) |
116 |
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objerror(m, USER, "bad transform"); |
117 |
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if (f->b->sca < 0.0) |
118 |
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f->b->sca = -f->b->sca; |
119 |
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if (dofwd) { /* do both transforms */ |
120 |
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if ((f->f = (XF *)malloc(sizeof(XF))) == NULL) |
121 |
greg |
2.3 |
goto memerr; |
122 |
greg |
2.2 |
xf(f->f, na-i, arg+i); |
123 |
|
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if (f->f->sca < 0.0) |
124 |
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f->f->sca = -f->f->sca; |
125 |
|
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} |
126 |
|
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} |
127 |
|
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m->os = (char *)f; |
128 |
|
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return(f); |
129 |
|
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toofew: |
130 |
greg |
2.4 |
objerror(m, USER, "too few string arguments"); |
131 |
greg |
2.2 |
memerr: |
132 |
|
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error(SYSTEM, "out of memory in getfunc"); |
133 |
|
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} |
134 |
|
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|
135 |
|
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|
136 |
greg |
2.14 |
void |
137 |
greg |
2.2 |
freefunc(m) /* free memory associated with modifier */ |
138 |
|
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OBJREC *m; |
139 |
|
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{ |
140 |
|
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register MFUNC *f; |
141 |
|
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register int i; |
142 |
|
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|
143 |
|
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if ((f = (MFUNC *)m->os) == NULL) |
144 |
|
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return; |
145 |
|
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for (i = 0; f->ep[i] != NULL; i++) |
146 |
|
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epfree(f->ep[i]); |
147 |
|
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if (f->ctx[0]) { /* done with definitions */ |
148 |
|
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setcontext(f->ctx); |
149 |
|
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i = varvalue(REFVNAME)-.5; /* reference_count-- */ |
150 |
|
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if (i > 0) |
151 |
|
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varset(REFVNAME, '=', (double)i); |
152 |
|
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else |
153 |
|
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dcleanup(2); /* remove definitions */ |
154 |
|
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freestr(f->ctx); |
155 |
|
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} |
156 |
|
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if (f->b != &unitxf) |
157 |
greg |
2.14 |
free((void *)f->b); |
158 |
greg |
2.2 |
if (f->f != NULL && f->f != &unitxf) |
159 |
greg |
2.14 |
free((void *)f->f); |
160 |
|
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free((void *)f); |
161 |
greg |
2.2 |
m->os = NULL; |
162 |
|
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} |
163 |
|
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|
164 |
|
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|
165 |
greg |
2.14 |
int |
166 |
greg |
2.2 |
setfunc(m, r) /* set channels for function call */ |
167 |
|
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OBJREC *m; |
168 |
greg |
1.1 |
register RAY *r; |
169 |
|
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{ |
170 |
greg |
2.9 |
static unsigned long lastrno = ~0; |
171 |
greg |
2.2 |
register MFUNC *f; |
172 |
|
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/* get function */ |
173 |
|
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if ((f = (MFUNC *)m->os) == NULL) |
174 |
greg |
2.14 |
objerror(m, CONSISTENCY, "setfunc called before getfunc"); |
175 |
greg |
2.2 |
/* set evaluator context */ |
176 |
|
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setcontext(f->ctx); |
177 |
|
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/* check to see if matrix set */ |
178 |
greg |
1.16 |
if (m == fobj && r->rno == lastrno) |
179 |
greg |
1.17 |
return(0); |
180 |
greg |
1.1 |
fobj = m; |
181 |
|
|
fray = r; |
182 |
greg |
1.13 |
if (r->rox != NULL) |
183 |
greg |
2.2 |
if (f->b != &unitxf) { |
184 |
|
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funcxf.sca = r->rox->b.sca * f->b->sca; |
185 |
|
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multmat4(funcxf.xfm, r->rox->b.xfm, f->b->xfm); |
186 |
greg |
1.13 |
} else |
187 |
|
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copystruct(&funcxf, &r->rox->b); |
188 |
|
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else |
189 |
greg |
2.2 |
copystruct(&funcxf, f->b); |
190 |
greg |
1.16 |
lastrno = r->rno; |
191 |
greg |
1.1 |
eclock++; /* notify expression evaluator */ |
192 |
greg |
1.17 |
return(1); |
193 |
greg |
1.1 |
} |
194 |
|
|
|
195 |
|
|
|
196 |
greg |
2.14 |
void |
197 |
greg |
1.1 |
loadfunc(fname) /* load definition file */ |
198 |
|
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char *fname; |
199 |
|
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{ |
200 |
|
|
char *ffname; |
201 |
|
|
|
202 |
greg |
2.12 |
if ((ffname = getpath(fname, getlibpath(), R_OK)) == NULL) { |
203 |
greg |
1.1 |
sprintf(errmsg, "cannot find function file \"%s\"", fname); |
204 |
|
|
error(USER, errmsg); |
205 |
|
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} |
206 |
|
|
fcompile(ffname); |
207 |
|
|
} |
208 |
|
|
|
209 |
|
|
|
210 |
greg |
2.2 |
static double |
211 |
greg |
1.1 |
l_arg() /* return nth real argument */ |
212 |
|
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{ |
213 |
|
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register int n; |
214 |
|
|
|
215 |
greg |
2.7 |
if (fobj == NULL) |
216 |
|
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syntax("arg(n) used in constant expression"); |
217 |
|
|
|
218 |
greg |
1.1 |
n = argument(1) + .5; /* round to integer */ |
219 |
|
|
|
220 |
|
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if (n < 1) |
221 |
|
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return(fobj->oargs.nfargs); |
222 |
|
|
|
223 |
|
|
if (n > fobj->oargs.nfargs) { |
224 |
|
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sprintf(errmsg, "missing real argument %d", n); |
225 |
|
|
objerror(fobj, USER, errmsg); |
226 |
|
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} |
227 |
|
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return(fobj->oargs.farg[n-1]); |
228 |
greg |
1.19 |
} |
229 |
|
|
|
230 |
|
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|
231 |
greg |
2.2 |
static double |
232 |
greg |
1.19 |
l_erf() /* error function */ |
233 |
|
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{ |
234 |
|
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extern double erf(); |
235 |
|
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|
236 |
|
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return(erf(argument(1))); |
237 |
|
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} |
238 |
|
|
|
239 |
|
|
|
240 |
greg |
2.2 |
static double |
241 |
greg |
1.19 |
l_erfc() /* cumulative error function */ |
242 |
|
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{ |
243 |
|
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extern double erfc(); |
244 |
|
|
|
245 |
|
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return(erfc(argument(1))); |
246 |
greg |
1.1 |
} |
247 |
|
|
|
248 |
|
|
|
249 |
|
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double |
250 |
|
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chanvalue(n) /* return channel n to calcomp */ |
251 |
|
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register int n; |
252 |
|
|
{ |
253 |
greg |
2.7 |
if (fray == NULL) |
254 |
|
|
syntax("ray parameter used in constant expression"); |
255 |
greg |
1.1 |
|
256 |
greg |
1.10 |
if (--n < 0) |
257 |
|
|
goto badchan; |
258 |
greg |
1.1 |
|
259 |
greg |
1.8 |
if (n < 3) /* ray direction */ |
260 |
greg |
1.1 |
|
261 |
greg |
1.12 |
return( ( fray->rdir[0]*funcxf.xfm[0][n] + |
262 |
|
|
fray->rdir[1]*funcxf.xfm[1][n] + |
263 |
|
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fray->rdir[2]*funcxf.xfm[2][n] ) |
264 |
|
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/ funcxf.sca ); |
265 |
greg |
1.1 |
|
266 |
greg |
1.8 |
if (n < 6) /* surface normal */ |
267 |
|
|
|
268 |
greg |
1.12 |
return( ( fray->ron[0]*funcxf.xfm[0][n-3] + |
269 |
|
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fray->ron[1]*funcxf.xfm[1][n-3] + |
270 |
|
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fray->ron[2]*funcxf.xfm[2][n-3] ) |
271 |
|
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/ funcxf.sca ); |
272 |
greg |
1.8 |
|
273 |
|
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if (n < 9) /* intersection */ |
274 |
|
|
|
275 |
greg |
1.12 |
return( fray->rop[0]*funcxf.xfm[0][n-6] + |
276 |
|
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fray->rop[1]*funcxf.xfm[1][n-6] + |
277 |
|
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fray->rop[2]*funcxf.xfm[2][n-6] + |
278 |
|
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funcxf.xfm[3][n-6] ); |
279 |
greg |
1.8 |
|
280 |
greg |
2.13 |
if (n == 9) /* total distance */ |
281 |
|
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return(raydist(fray,PRIMARY) * funcxf.sca); |
282 |
greg |
1.10 |
|
283 |
greg |
1.18 |
if (n == 10) /* dot product (range [-1,1]) */ |
284 |
|
|
return( fray->rod <= -1.0 ? -1.0 : |
285 |
|
|
fray->rod >= 1.0 ? 1.0 : |
286 |
|
|
fray->rod ); |
287 |
greg |
1.10 |
|
288 |
greg |
1.8 |
if (n == 11) /* scale */ |
289 |
greg |
1.12 |
return(funcxf.sca); |
290 |
greg |
1.8 |
|
291 |
|
|
if (n < 15) /* origin */ |
292 |
greg |
1.12 |
return(funcxf.xfm[3][n-12]); |
293 |
greg |
1.8 |
|
294 |
|
|
if (n < 18) /* i unit vector */ |
295 |
greg |
1.12 |
return(funcxf.xfm[0][n-15] / funcxf.sca); |
296 |
greg |
1.8 |
|
297 |
|
|
if (n < 21) /* j unit vector */ |
298 |
greg |
1.12 |
return(funcxf.xfm[1][n-15] / funcxf.sca); |
299 |
greg |
1.8 |
|
300 |
|
|
if (n < 24) /* k unit vector */ |
301 |
greg |
1.12 |
return(funcxf.xfm[2][n-21] / funcxf.sca); |
302 |
greg |
2.6 |
|
303 |
greg |
2.13 |
if (n == 24) /* single ray (shadow) distance */ |
304 |
|
|
return((fray->rot+raydist(fray->parent,SHADOW)) * funcxf.sca); |
305 |
greg |
1.10 |
badchan: |
306 |
|
|
error(USER, "illegal channel number"); |
307 |
greg |
1.1 |
} |