1 |
/* Copyright (c) 1986 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* func.c - interface to calcomp functions. |
9 |
* |
10 |
* 4/7/86 |
11 |
*/ |
12 |
|
13 |
#include "ray.h" |
14 |
|
15 |
#include "otypes.h" |
16 |
|
17 |
|
18 |
typedef struct { |
19 |
double xfm[4][4]; /* transform matrix */ |
20 |
double sca; /* scalefactor */ |
21 |
} XF; |
22 |
|
23 |
static OBJREC *fobj; /* current function object */ |
24 |
static RAY *fray; /* current function ray */ |
25 |
static XF fxf; /* current transformation */ |
26 |
|
27 |
|
28 |
setmap(m, r, xfm, sca) /* set channels for function call */ |
29 |
OBJREC *m; |
30 |
register RAY *r; |
31 |
double xfm[4][4]; |
32 |
double sca; |
33 |
{ |
34 |
extern double l_noise3(), l_noise3a(), l_noise3b(), l_noise3c(); |
35 |
extern double l_hermite(), l_fnoise3(), l_arg(); |
36 |
extern long eclock; |
37 |
static char *initfile = "rayinit.cal"; |
38 |
|
39 |
if (initfile != NULL) { |
40 |
loadfunc(initfile); |
41 |
scompile(NULL, "Dx=$1;Dy=$2;Dz=$3;"); |
42 |
scompile(NULL, "Nx=$4;Ny=$5;Nz=$6;"); |
43 |
scompile(NULL, "Px=$7;Py=$8;Pz=$9;"); |
44 |
scompile(NULL, "T=$10;Rdot=$11;"); |
45 |
funset("arg", 1, l_arg); |
46 |
funset("noise3", 3, l_noise3); |
47 |
funset("noise3a", 3, l_noise3a); |
48 |
funset("noise3b", 3, l_noise3b); |
49 |
funset("noise3c", 3, l_noise3c); |
50 |
funset("hermite", 5, l_hermite); |
51 |
funset("fnoise3", 3, l_fnoise3); |
52 |
initfile = NULL; |
53 |
} |
54 |
fobj = m; |
55 |
fray = r; |
56 |
fxf.sca = r->robs * sca; |
57 |
multmat4(fxf.xfm, r->robx, xfm); |
58 |
eclock++; /* notify expression evaluator */ |
59 |
} |
60 |
|
61 |
|
62 |
setfunc(m, r) /* simplified interface to setmap */ |
63 |
register OBJREC *m; |
64 |
RAY *r; |
65 |
{ |
66 |
register XF *mxf; |
67 |
|
68 |
if ((mxf = (XF *)m->os) == NULL) { |
69 |
register int n; |
70 |
register char **sa; |
71 |
|
72 |
for (n = m->oargs.nsargs, sa = m->oargs.sarg; |
73 |
n > 0 && **sa != '-'; n--, sa++) |
74 |
; |
75 |
mxf = (XF *)malloc(sizeof(XF)); |
76 |
if (mxf == NULL) |
77 |
goto memerr; |
78 |
if (invxf(mxf->xfm, &mxf->sca, n, sa) != n) |
79 |
objerror(m, USER, "bad transform"); |
80 |
if (mxf->sca < 0.0) |
81 |
mxf->sca = -mxf->sca; |
82 |
m->os = (char *)mxf; |
83 |
} |
84 |
setmap(m, r, mxf->xfm, mxf->sca); |
85 |
return; |
86 |
memerr: |
87 |
error(SYSTEM, "out of memory in setfunc"); |
88 |
#undef mxf |
89 |
} |
90 |
|
91 |
|
92 |
loadfunc(fname) /* load definition file */ |
93 |
char *fname; |
94 |
{ |
95 |
extern char *libpath; /* library search path */ |
96 |
char *ffname; |
97 |
|
98 |
if ((ffname = getpath(fname, libpath, R_OK)) == NULL) { |
99 |
sprintf(errmsg, "cannot find function file \"%s\"", fname); |
100 |
error(USER, errmsg); |
101 |
} |
102 |
fcompile(ffname); |
103 |
} |
104 |
|
105 |
|
106 |
double |
107 |
l_arg() /* return nth real argument */ |
108 |
{ |
109 |
extern double argument(); |
110 |
register int n; |
111 |
|
112 |
n = argument(1) + .5; /* round to integer */ |
113 |
|
114 |
if (n < 1) |
115 |
return(fobj->oargs.nfargs); |
116 |
|
117 |
if (n > fobj->oargs.nfargs) { |
118 |
sprintf(errmsg, "missing real argument %d", n); |
119 |
objerror(fobj, USER, errmsg); |
120 |
} |
121 |
return(fobj->oargs.farg[n-1]); |
122 |
} |
123 |
|
124 |
|
125 |
double |
126 |
chanvalue(n) /* return channel n to calcomp */ |
127 |
register int n; |
128 |
{ |
129 |
double res; |
130 |
register RAY *r; |
131 |
|
132 |
n--; /* for convenience */ |
133 |
|
134 |
if (n < 0 || n > 10) |
135 |
error(USER, "illegal channel number"); |
136 |
|
137 |
if (n == 9) { /* distance */ |
138 |
|
139 |
res = fray->rot; |
140 |
for (r = fray->parent; r != NULL; r = r->parent) |
141 |
res += r->rot; |
142 |
res *= fxf.sca; |
143 |
|
144 |
} else if (n == 10) { /* dot product */ |
145 |
|
146 |
res = fray->rod; |
147 |
|
148 |
} else if (n < 3) { /* ray direction */ |
149 |
res = ( fray->rdir[0]*fxf.xfm[0][n] + |
150 |
fray->rdir[1]*fxf.xfm[1][n] + |
151 |
fray->rdir[2]*fxf.xfm[2][n] ) |
152 |
/ fxf.sca ; |
153 |
} else if (n < 6) { /* surface normal */ |
154 |
res = ( fray->ron[0]*fxf.xfm[0][n-3] + |
155 |
fray->ron[1]*fxf.xfm[1][n-3] + |
156 |
fray->ron[2]*fxf.xfm[2][n-3] ) |
157 |
/ fxf.sca ; |
158 |
} else { /* intersection */ |
159 |
res = fray->rop[0]*fxf.xfm[0][n-6] + |
160 |
fray->rop[1]*fxf.xfm[1][n-6] + |
161 |
fray->rop[2]*fxf.xfm[2][n-6] + |
162 |
fxf.xfm[3][n-6] ; |
163 |
} |
164 |
|
165 |
return(res); |
166 |
} |