1 |
gregl |
3.1 |
#ifndef lint |
2 |
greg |
3.33 |
static const char RCSid[] = "$Id$"; |
3 |
gregl |
3.1 |
#endif |
4 |
|
|
/* |
5 |
gregl |
3.2 |
* Holodeck beam tracking for display process |
6 |
gregl |
3.1 |
*/ |
7 |
|
|
|
8 |
|
|
#include "rholo.h" |
9 |
|
|
#include "rhdisp.h" |
10 |
|
|
#include "rhdriver.h" |
11 |
|
|
|
12 |
gwlarson |
3.26 |
#ifndef MEYERNG |
13 |
gwlarson |
3.30 |
#define MEYERNG 0.2 /* target mean eye range (rel. to grid) */ |
14 |
gwlarson |
3.26 |
#endif |
15 |
gwlarson |
3.20 |
|
16 |
gregl |
3.1 |
#define CBEAMBLK 1024 /* cbeam allocation block size */ |
17 |
|
|
|
18 |
gwlarson |
3.32 |
static PACKHEAD *cbeam = NULL; /* current beam list */ |
19 |
gregl |
3.1 |
static int ncbeams = 0; /* number of sorted beams in cbeam */ |
20 |
|
|
static int xcbeams = 0; /* extra (unregistered) beams past ncbeams */ |
21 |
|
|
static int maxcbeam = 0; /* size of cbeam array */ |
22 |
|
|
|
23 |
gwlarson |
3.32 |
VIEWPOINT cureye; /* current eye position */ |
24 |
gregl |
3.1 |
|
25 |
gwlarson |
3.32 |
|
26 |
gregl |
3.1 |
int |
27 |
|
|
newcbeam() /* allocate new entry at end of cbeam array */ |
28 |
|
|
{ |
29 |
|
|
int i; |
30 |
|
|
|
31 |
|
|
if ((i = ncbeams + xcbeams++) >= maxcbeam) { /* grow array */ |
32 |
|
|
maxcbeam += CBEAMBLK; |
33 |
|
|
if (cbeam == NULL) |
34 |
gwlarson |
3.32 |
cbeam = (PACKHEAD *)malloc( |
35 |
|
|
maxcbeam*sizeof(PACKHEAD) ); |
36 |
gregl |
3.1 |
else |
37 |
gwlarson |
3.32 |
cbeam = (PACKHEAD *)realloc( (char *)cbeam, |
38 |
|
|
maxcbeam*sizeof(PACKHEAD) ); |
39 |
gregl |
3.1 |
if (cbeam == NULL) |
40 |
|
|
error(SYSTEM, "out of memory in newcbeam"); |
41 |
|
|
} |
42 |
|
|
return(i); |
43 |
|
|
} |
44 |
|
|
|
45 |
|
|
|
46 |
|
|
int |
47 |
|
|
cbeamcmp(cb1, cb2) /* compare two cbeam entries for sort: keep orphans */ |
48 |
gwlarson |
3.32 |
register PACKHEAD *cb1, *cb2; |
49 |
gregl |
3.1 |
{ |
50 |
|
|
register int c; |
51 |
|
|
|
52 |
|
|
if ((c = cb1->bi - cb2->bi)) /* sort on beam index first */ |
53 |
|
|
return(c); |
54 |
|
|
return(cb1->hd - cb2->hd); /* use hd to resolve matches */ |
55 |
|
|
} |
56 |
|
|
|
57 |
|
|
|
58 |
|
|
int |
59 |
|
|
cbeamcmp2(cb1, cb2) /* compare two cbeam entries for sort: no orphans */ |
60 |
gwlarson |
3.32 |
register PACKHEAD *cb1, *cb2; |
61 |
gregl |
3.1 |
{ |
62 |
|
|
register int c; |
63 |
|
|
|
64 |
gwlarson |
3.22 |
if (!cb1->nr) /* put orphans at the end, unsorted */ |
65 |
|
|
return(cb2->nr); |
66 |
|
|
if (!cb2->nr) |
67 |
gregl |
3.15 |
return(-1); |
68 |
gregl |
3.1 |
if ((c = cb1->bi - cb2->bi)) /* sort on beam index first */ |
69 |
|
|
return(c); |
70 |
|
|
return(cb1->hd - cb2->hd); /* use hd to resolve matches */ |
71 |
|
|
} |
72 |
|
|
|
73 |
|
|
|
74 |
|
|
int |
75 |
|
|
findcbeam(hd, bi) /* find the specified beam in our sorted list */ |
76 |
|
|
int hd, bi; |
77 |
|
|
{ |
78 |
gwlarson |
3.32 |
PACKHEAD cb; |
79 |
|
|
register PACKHEAD *p; |
80 |
gregl |
3.1 |
|
81 |
|
|
if (ncbeams <= 0) |
82 |
|
|
return(-1); |
83 |
gwlarson |
3.32 |
cb.hd = hd; cb.bi = bi; cb.nr = cb.nc = 0; |
84 |
|
|
p = (PACKHEAD *)bsearch((char *)&cb, (char *)cbeam, ncbeams, |
85 |
|
|
sizeof(PACKHEAD), cbeamcmp); |
86 |
gregl |
3.1 |
if (p == NULL) |
87 |
|
|
return(-1); |
88 |
|
|
return(p - cbeam); |
89 |
|
|
} |
90 |
|
|
|
91 |
|
|
|
92 |
|
|
int |
93 |
|
|
getcbeam(hd, bi) /* get the specified beam, allocating as necessary */ |
94 |
|
|
register int hd; |
95 |
|
|
int bi; |
96 |
|
|
{ |
97 |
|
|
register int n; |
98 |
|
|
/* first, look in sorted list */ |
99 |
|
|
if ((n = findcbeam(hd, bi)) >= 0) |
100 |
|
|
return(n); |
101 |
|
|
/* linear search through xcbeams to be sure */ |
102 |
|
|
for (n = ncbeams+xcbeams; n-- > ncbeams; ) |
103 |
|
|
if (cbeam[n].bi == bi && cbeam[n].hd == hd) |
104 |
|
|
return(n); |
105 |
|
|
/* check legality */ |
106 |
|
|
if (hd < 0 | hd >= HDMAX || hdlist[hd] == NULL) |
107 |
|
|
error(INTERNAL, "illegal holodeck number in getcbeam"); |
108 |
|
|
if (bi < 1 | bi > nbeams(hdlist[hd])) |
109 |
|
|
error(INTERNAL, "illegal beam index in getcbeam"); |
110 |
|
|
n = newcbeam(); /* allocate and assign */ |
111 |
gwlarson |
3.32 |
cbeam[n].hd = hd; cbeam[n].bi = bi; cbeam[n].nr = cbeam[n].nc = 0; |
112 |
gregl |
3.1 |
return(n); |
113 |
|
|
} |
114 |
|
|
|
115 |
|
|
|
116 |
|
|
cbeamsort(adopt) /* sort our beam list, possibly turning out orphans */ |
117 |
|
|
int adopt; |
118 |
|
|
{ |
119 |
|
|
register int i; |
120 |
|
|
|
121 |
|
|
if (!(ncbeams += xcbeams)) |
122 |
|
|
return; |
123 |
|
|
xcbeams = 0; |
124 |
gwlarson |
3.32 |
qsort((char *)cbeam, ncbeams, sizeof(PACKHEAD), |
125 |
gregl |
3.1 |
adopt ? cbeamcmp : cbeamcmp2); |
126 |
|
|
if (adopt) |
127 |
|
|
return; |
128 |
|
|
for (i = ncbeams; i--; ) /* identify orphans */ |
129 |
gwlarson |
3.22 |
if (cbeam[i].nr) |
130 |
gregl |
3.1 |
break; |
131 |
|
|
xcbeams = ncbeams - ++i; /* put orphans after ncbeams */ |
132 |
|
|
ncbeams = i; |
133 |
|
|
} |
134 |
|
|
|
135 |
|
|
|
136 |
gwlarson |
3.24 |
beam_init(fresh) /* clear beam list for new view(s) */ |
137 |
|
|
int fresh; |
138 |
gregl |
3.1 |
{ |
139 |
gwlarson |
3.21 |
register int i; |
140 |
gwlarson |
3.24 |
|
141 |
|
|
if (fresh) /* discard old beams? */ |
142 |
|
|
ncbeams = xcbeams = 0; |
143 |
|
|
else /* else clear sample requests */ |
144 |
|
|
for (i = ncbeams+xcbeams; i--; ) |
145 |
|
|
cbeam[i].nr = 0; |
146 |
gwlarson |
3.26 |
cureye.rng = 0.; |
147 |
gregl |
3.1 |
} |
148 |
|
|
|
149 |
|
|
|
150 |
gwlarson |
3.32 |
int2 * |
151 |
gwlarson |
3.21 |
beam_view(vn, hr, vr) /* add beam view (if advisable) */ |
152 |
|
|
VIEW *vn; |
153 |
|
|
int hr, vr; |
154 |
gregl |
3.4 |
{ |
155 |
gwlarson |
3.32 |
int2 *slist; |
156 |
|
|
BEAMLIST blist; |
157 |
|
|
double eravg, d; |
158 |
gwlarson |
3.26 |
register HOLO *hp; |
159 |
gwlarson |
3.32 |
register int i, n; |
160 |
|
|
/* compute beams for view */ |
161 |
|
|
slist = viewbeams(vn, hr, vr, &blist); |
162 |
|
|
if (*slist < 0) { |
163 |
|
|
error(COMMAND, "no sections visible from this view"); |
164 |
gwlarson |
3.29 |
return(NULL); |
165 |
gwlarson |
3.32 |
} |
166 |
gwlarson |
3.30 |
/* sort current beam list */ |
167 |
gwlarson |
3.21 |
cbeamsort(1); |
168 |
gwlarson |
3.32 |
/* add new beams to list */ |
169 |
|
|
for (i = blist.nb; i--; ) { |
170 |
|
|
n = getcbeam(blist.bl[i].hd, blist.bl[i].bi); |
171 |
|
|
if (blist.bl[i].nr > cbeam[n].nr) |
172 |
|
|
cbeam[n].nr = blist.bl[i].nr; |
173 |
|
|
} |
174 |
greg |
3.33 |
free((void *)blist.bl); /* free list */ |
175 |
gwlarson |
3.32 |
if (MEYERNG <= FTINY) |
176 |
|
|
return(slist); |
177 |
|
|
/* compute average eye range */ |
178 |
gwlarson |
3.30 |
eravg = 0.; |
179 |
gwlarson |
3.32 |
for (n = 0; slist[n] >= 0; n++) { |
180 |
|
|
hp = hdlist[slist[n]]; |
181 |
|
|
eravg += MEYERNG/3. / VLEN(hp->wg[0]) + |
182 |
gwlarson |
3.30 |
MEYERNG/3. / VLEN(hp->wg[1]) + |
183 |
|
|
MEYERNG/3. / VLEN(hp->wg[2]) ; |
184 |
|
|
} |
185 |
|
|
eravg /= (double)n; |
186 |
gwlarson |
3.26 |
/* add to current eye position */ |
187 |
|
|
if (cureye.rng <= FTINY) { |
188 |
|
|
VCOPY(cureye.vpt, vn->vp); |
189 |
gwlarson |
3.30 |
cureye.rng = eravg; |
190 |
|
|
} else if ((d = sqrt(dist2(vn->vp,cureye.vpt))) + eravg > cureye.rng) { |
191 |
gwlarson |
3.26 |
for (i = 3; i--; ) |
192 |
|
|
cureye.vpt[i] = 0.5*(cureye.vpt[i] + vn->vp[i]); |
193 |
gwlarson |
3.30 |
cureye.rng = 0.5*(cureye.rng + eravg + d); |
194 |
gwlarson |
3.26 |
} |
195 |
gwlarson |
3.32 |
return(slist); |
196 |
gregl |
3.4 |
} |
197 |
|
|
|
198 |
|
|
|
199 |
gwlarson |
3.21 |
int |
200 |
|
|
beam_sync(all) /* update beam list on server */ |
201 |
|
|
int all; |
202 |
gregl |
3.1 |
{ |
203 |
gwlarson |
3.26 |
/* set new eye position */ |
204 |
|
|
serv_request(DR_VIEWPOINT, sizeof(VIEWPOINT), (char *)&cureye); |
205 |
gwlarson |
3.24 |
/* sort list (put orphans at end) */ |
206 |
|
|
cbeamsort(all < 0); |
207 |
gwlarson |
3.26 |
/* send beam request */ |
208 |
gwlarson |
3.32 |
if (all) { |
209 |
|
|
if (ncbeams > 0) |
210 |
|
|
serv_request(DR_NEWSET, |
211 |
|
|
ncbeams*sizeof(PACKHEAD), cbeam); |
212 |
|
|
} else { |
213 |
|
|
if (ncbeams+xcbeams > 0) |
214 |
|
|
serv_request(DR_ADJSET, |
215 |
|
|
(ncbeams+xcbeams)*sizeof(PACKHEAD), cbeam); |
216 |
|
|
} |
217 |
gregl |
3.1 |
xcbeams = 0; /* truncate our list */ |
218 |
gwlarson |
3.21 |
return(ncbeams); |
219 |
gwlarson |
3.32 |
} |
220 |
|
|
|
221 |
|
|
|
222 |
|
|
gridlines(f) /* run through holodeck section grid lines */ |
223 |
|
|
int (*f)(); |
224 |
|
|
{ |
225 |
|
|
register int hd, w, i; |
226 |
|
|
int g0, g1; |
227 |
|
|
FVECT wp[2], mov; |
228 |
|
|
double d; |
229 |
|
|
/* do each wall on each section */ |
230 |
|
|
for (hd = 0; hdlist[hd] != NULL; hd++) |
231 |
|
|
for (w = 0; w < 6; w++) { |
232 |
|
|
g0 = hdwg0[w]; |
233 |
|
|
g1 = hdwg1[w]; |
234 |
|
|
d = 1.0/hdlist[hd]->grid[g0]; |
235 |
|
|
mov[0] = d * hdlist[hd]->xv[g0][0]; |
236 |
|
|
mov[1] = d * hdlist[hd]->xv[g0][1]; |
237 |
|
|
mov[2] = d * hdlist[hd]->xv[g0][2]; |
238 |
|
|
if (w & 1) { |
239 |
|
|
VSUM(wp[0], hdlist[hd]->orig, |
240 |
|
|
hdlist[hd]->xv[w>>1], 1.); |
241 |
|
|
VSUM(wp[0], wp[0], mov, 1.); |
242 |
|
|
} else |
243 |
|
|
VCOPY(wp[0], hdlist[hd]->orig); |
244 |
|
|
VSUM(wp[1], wp[0], hdlist[hd]->xv[g1], 1.); |
245 |
|
|
for (i = hdlist[hd]->grid[g0]; ; ) { /* g0 lines */ |
246 |
|
|
(*f)(wp); |
247 |
|
|
if (!--i) break; |
248 |
|
|
wp[0][0] += mov[0]; wp[0][1] += mov[1]; |
249 |
|
|
wp[0][2] += mov[2]; wp[1][0] += mov[0]; |
250 |
|
|
wp[1][1] += mov[1]; wp[1][2] += mov[2]; |
251 |
|
|
} |
252 |
|
|
d = 1.0/hdlist[hd]->grid[g1]; |
253 |
|
|
mov[0] = d * hdlist[hd]->xv[g1][0]; |
254 |
|
|
mov[1] = d * hdlist[hd]->xv[g1][1]; |
255 |
|
|
mov[2] = d * hdlist[hd]->xv[g1][2]; |
256 |
|
|
if (w & 1) |
257 |
|
|
VSUM(wp[0], hdlist[hd]->orig, |
258 |
|
|
hdlist[hd]->xv[w>>1], 1.); |
259 |
|
|
else |
260 |
|
|
VSUM(wp[0], hdlist[hd]->orig, mov, 1.); |
261 |
|
|
VSUM(wp[1], wp[0], hdlist[hd]->xv[g0], 1.); |
262 |
|
|
for (i = hdlist[hd]->grid[g1]; ; ) { /* g1 lines */ |
263 |
|
|
(*f)(wp); |
264 |
|
|
if (!--i) break; |
265 |
|
|
wp[0][0] += mov[0]; wp[0][1] += mov[1]; |
266 |
|
|
wp[0][2] += mov[2]; wp[1][0] += mov[0]; |
267 |
|
|
wp[1][1] += mov[1]; wp[1][2] += mov[2]; |
268 |
|
|
} |
269 |
|
|
} |
270 |
gregl |
3.1 |
} |