1 |
gregl |
3.17 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
2 |
gregl |
3.1 |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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/* |
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gregl |
3.2 |
* Holodeck beam tracking for display process |
9 |
gregl |
3.1 |
*/ |
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#include "rholo.h" |
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#include "rhdisp.h" |
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#include "rhdriver.h" |
14 |
gwlarson |
3.25 |
#include "random.h" |
15 |
gregl |
3.1 |
|
16 |
gregl |
3.9 |
#ifndef MAXDIST |
17 |
gregl |
3.14 |
#define MAXDIST 42 /* maximum distance outside section */ |
18 |
gregl |
3.9 |
#endif |
19 |
gwlarson |
3.25 |
#ifndef NVSAMPS |
20 |
gwlarson |
3.28 |
#define NVSAMPS 16384 /* number of ray samples per view */ |
21 |
gwlarson |
3.25 |
#endif |
22 |
gwlarson |
3.26 |
#ifndef MEYERNG |
23 |
gwlarson |
3.30 |
#define MEYERNG 0.2 /* target mean eye range (rel. to grid) */ |
24 |
gwlarson |
3.26 |
#endif |
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#ifndef MAXTODO |
26 |
gwlarson |
3.25 |
#define MAXTODO 3 /* maximum sections to look at */ |
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gwlarson |
3.26 |
#endif |
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#ifndef MAXDRAT |
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#define MAXDRAT 3.0 /* maximum distance ratio btwn. cand. sect. */ |
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#endif |
31 |
gwlarson |
3.20 |
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32 |
gregl |
3.1 |
#define CBEAMBLK 1024 /* cbeam allocation block size */ |
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static struct beamcomp { |
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gwlarson |
3.22 |
int hd; /* holodeck section number */ |
36 |
gwlarson |
3.24 |
int bi; /* beam index */ |
37 |
gwlarson |
3.21 |
int4 nr; /* number of samples desired */ |
38 |
gregl |
3.1 |
} *cbeam = NULL; /* current beam list */ |
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gwlarson |
3.26 |
VIEWPOINT cureye; /* current eye position */ |
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42 |
gregl |
3.1 |
static int ncbeams = 0; /* number of sorted beams in cbeam */ |
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static int xcbeams = 0; /* extra (unregistered) beams past ncbeams */ |
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static int maxcbeam = 0; /* size of cbeam array */ |
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int |
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newcbeam() /* allocate new entry at end of cbeam array */ |
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{ |
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int i; |
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if ((i = ncbeams + xcbeams++) >= maxcbeam) { /* grow array */ |
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maxcbeam += CBEAMBLK; |
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if (cbeam == NULL) |
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cbeam = (struct beamcomp *)malloc( |
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maxcbeam*sizeof(struct beamcomp) ); |
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else |
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cbeam = (struct beamcomp *)realloc( (char *)cbeam, |
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maxcbeam*sizeof(struct beamcomp) ); |
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if (cbeam == NULL) |
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error(SYSTEM, "out of memory in newcbeam"); |
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} |
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return(i); |
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} |
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int |
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cbeamcmp(cb1, cb2) /* compare two cbeam entries for sort: keep orphans */ |
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register struct beamcomp *cb1, *cb2; |
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{ |
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register int c; |
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if ((c = cb1->bi - cb2->bi)) /* sort on beam index first */ |
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return(c); |
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return(cb1->hd - cb2->hd); /* use hd to resolve matches */ |
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} |
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int |
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cbeamcmp2(cb1, cb2) /* compare two cbeam entries for sort: no orphans */ |
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register struct beamcomp *cb1, *cb2; |
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{ |
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register int c; |
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gwlarson |
3.22 |
if (!cb1->nr) /* put orphans at the end, unsorted */ |
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return(cb2->nr); |
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if (!cb2->nr) |
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gregl |
3.15 |
return(-1); |
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gregl |
3.1 |
if ((c = cb1->bi - cb2->bi)) /* sort on beam index first */ |
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return(c); |
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return(cb1->hd - cb2->hd); /* use hd to resolve matches */ |
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} |
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int |
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findcbeam(hd, bi) /* find the specified beam in our sorted list */ |
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int hd, bi; |
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{ |
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struct beamcomp cb; |
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register struct beamcomp *p; |
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if (ncbeams <= 0) |
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return(-1); |
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gwlarson |
3.22 |
cb.hd = hd; cb.bi = bi; cb.nr = 0; |
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gregl |
3.1 |
p = (struct beamcomp *)bsearch((char *)&cb, (char *)cbeam, ncbeams, |
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sizeof(struct beamcomp), cbeamcmp); |
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if (p == NULL) |
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return(-1); |
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return(p - cbeam); |
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} |
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113 |
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int |
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getcbeam(hd, bi) /* get the specified beam, allocating as necessary */ |
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register int hd; |
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int bi; |
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{ |
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register int n; |
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/* first, look in sorted list */ |
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if ((n = findcbeam(hd, bi)) >= 0) |
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return(n); |
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/* linear search through xcbeams to be sure */ |
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for (n = ncbeams+xcbeams; n-- > ncbeams; ) |
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if (cbeam[n].bi == bi && cbeam[n].hd == hd) |
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return(n); |
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/* check legality */ |
127 |
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if (hd < 0 | hd >= HDMAX || hdlist[hd] == NULL) |
128 |
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error(INTERNAL, "illegal holodeck number in getcbeam"); |
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if (bi < 1 | bi > nbeams(hdlist[hd])) |
130 |
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error(INTERNAL, "illegal beam index in getcbeam"); |
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n = newcbeam(); /* allocate and assign */ |
132 |
gwlarson |
3.22 |
cbeam[n].nr = 0; cbeam[n].hd = hd; cbeam[n].bi = bi; |
133 |
gregl |
3.1 |
return(n); |
134 |
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} |
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136 |
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137 |
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cbeamsort(adopt) /* sort our beam list, possibly turning out orphans */ |
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int adopt; |
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{ |
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register int i; |
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142 |
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if (!(ncbeams += xcbeams)) |
143 |
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return; |
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xcbeams = 0; |
145 |
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qsort((char *)cbeam, ncbeams, sizeof(struct beamcomp), |
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adopt ? cbeamcmp : cbeamcmp2); |
147 |
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if (adopt) |
148 |
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return; |
149 |
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for (i = ncbeams; i--; ) /* identify orphans */ |
150 |
gwlarson |
3.22 |
if (cbeam[i].nr) |
151 |
gregl |
3.1 |
break; |
152 |
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xcbeams = ncbeams - ++i; /* put orphans after ncbeams */ |
153 |
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ncbeams = i; |
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} |
155 |
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156 |
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157 |
gwlarson |
3.21 |
cbeamop(op, bl, n) /* update beams on server list */ |
158 |
gregl |
3.4 |
int op; |
159 |
gregl |
3.1 |
register struct beamcomp *bl; |
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int n; |
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{ |
162 |
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register PACKHEAD *pa; |
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register int i; |
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if (n <= 0) |
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return; |
167 |
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pa = (PACKHEAD *)malloc(n*sizeof(PACKHEAD)); |
168 |
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if (pa == NULL) |
169 |
gwlarson |
3.21 |
error(SYSTEM, "out of memory in cbeamop"); |
170 |
gregl |
3.1 |
for (i = 0; i < n; i++) { |
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pa[i].hd = bl[i].hd; |
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pa[i].bi = bl[i].bi; |
173 |
gwlarson |
3.21 |
pa[i].nr = bl[i].nr; |
174 |
gregl |
3.16 |
pa[i].nc = 0; |
175 |
gregl |
3.1 |
} |
176 |
gregl |
3.4 |
serv_request(op, n*sizeof(PACKHEAD), (char *)pa); |
177 |
gregl |
3.1 |
free((char *)pa); |
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} |
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180 |
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181 |
gwlarson |
3.29 |
static int |
182 |
gwlarson |
3.25 |
comptodo(tdl, vw) /* compute holodeck sections in view */ |
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int tdl[MAXTODO+1]; |
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VIEW *vw; |
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gregl |
3.1 |
{ |
186 |
gwlarson |
3.25 |
int n = 0; |
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FVECT gp, dv; |
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double dist2[MAXTODO+1], thisdist2; |
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register int i, j; |
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/* find closest MAXTODO sections */ |
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for (i = 0; hdlist[i]; i++) { |
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hdgrid(gp, hdlist[i], vw->vp); |
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for (j = 0; j < 3; j++) |
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if (gp[j] < 0.) |
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dv[j] = -gp[j]; |
196 |
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else if (gp[j] > hdlist[i]->grid[j]) |
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dv[j] = gp[j] - hdlist[i]->grid[j]; |
198 |
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else |
199 |
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dv[j] = 0.; |
200 |
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thisdist2 = DOT(dv,dv); |
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for (j = n; j > 0 && thisdist2 < dist2[j-1]; j--) { |
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tdl[j] = tdl[j-1]; |
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dist2[j] = dist2[j-1]; |
204 |
gregl |
3.1 |
} |
205 |
gwlarson |
3.25 |
tdl[j] = i; |
206 |
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dist2[j] = thisdist2; |
207 |
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if (n < MAXTODO) |
208 |
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n++; |
209 |
gregl |
3.1 |
} |
210 |
gwlarson |
3.25 |
/* watch for bad move */ |
211 |
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if (n && dist2[0] > MAXDIST*MAXDIST) { |
212 |
gregl |
3.10 |
error(COMMAND, "move past outer limits"); |
213 |
gregl |
3.9 |
return(0); |
214 |
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} |
215 |
gwlarson |
3.25 |
/* avoid big differences */ |
216 |
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for (j = 1; j < n; j++) |
217 |
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if (dist2[j] > MAXDRAT*MAXDRAT*dist2[j-1]) |
218 |
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n = j; |
219 |
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tdl[n] = -1; |
220 |
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return(n); |
221 |
gregl |
3.1 |
} |
222 |
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223 |
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224 |
gwlarson |
3.29 |
int |
225 |
gwlarson |
3.30 |
addview(hd, vw, rad, hres, vres) /* add view for section */ |
226 |
gwlarson |
3.25 |
int hd; |
227 |
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VIEW *vw; |
228 |
gwlarson |
3.30 |
double rad; |
229 |
gwlarson |
3.25 |
int hres, vres; |
230 |
gregl |
3.1 |
{ |
231 |
gwlarson |
3.29 |
int sampquant, samptot = 0; |
232 |
gwlarson |
3.25 |
int h, v, shr, svr; |
233 |
gregl |
3.1 |
GCOORD gc[2]; |
234 |
gwlarson |
3.25 |
FVECT rorg, rdir; |
235 |
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/* compute sampling grid */ |
236 |
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if (hres|vres && hres*vres <= NVSAMPS) { |
237 |
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shr = hres; svr = vres; |
238 |
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sampquant = 1; |
239 |
gregl |
3.5 |
} else { |
240 |
gwlarson |
3.25 |
shr = sqrt(NVSAMPS/viewaspect(vw)) + .5; |
241 |
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svr = (NVSAMPS + shr/2)/shr; |
242 |
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sampquant = (hres*vres + shr*svr/2)/(shr*svr); |
243 |
gregl |
3.5 |
} |
244 |
gwlarson |
3.25 |
/* intersect sample rays with section */ |
245 |
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for (v = svr; v--; ) |
246 |
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for (h = shr; h--; ) { |
247 |
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if (viewray(rorg, rdir, vw, (v+frandom())/svr, |
248 |
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(h+frandom())/shr) < -FTINY) |
249 |
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continue; |
250 |
gwlarson |
3.30 |
if (rad > FTINY) { |
251 |
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rorg[0] += (1.-2.*frandom())*rad; |
252 |
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rorg[1] += (1.-2.*frandom())*rad; |
253 |
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rorg[2] += (1.-2.*frandom())*rad; |
254 |
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} |
255 |
gwlarson |
3.25 |
if (hdinter(gc, NULL, NULL, hdlist[hd], rorg, rdir) |
256 |
gwlarson |
3.30 |
>= 0.99*FHUGE) |
257 |
gwlarson |
3.25 |
continue; |
258 |
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cbeam[getcbeam(hd,hdbindex(hdlist[hd],gc))].nr += |
259 |
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sampquant; |
260 |
gwlarson |
3.29 |
samptot += sampquant; |
261 |
gregl |
3.1 |
} |
262 |
gwlarson |
3.29 |
return(samptot); |
263 |
gregl |
3.1 |
} |
264 |
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265 |
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266 |
gwlarson |
3.24 |
beam_init(fresh) /* clear beam list for new view(s) */ |
267 |
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int fresh; |
268 |
gregl |
3.1 |
{ |
269 |
gwlarson |
3.21 |
register int i; |
270 |
gwlarson |
3.24 |
|
271 |
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if (fresh) /* discard old beams? */ |
272 |
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ncbeams = xcbeams = 0; |
273 |
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else /* else clear sample requests */ |
274 |
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for (i = ncbeams+xcbeams; i--; ) |
275 |
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cbeam[i].nr = 0; |
276 |
gwlarson |
3.26 |
cureye.rng = 0.; |
277 |
gregl |
3.1 |
} |
278 |
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279 |
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280 |
gwlarson |
3.29 |
int * |
281 |
gwlarson |
3.21 |
beam_view(vn, hr, vr) /* add beam view (if advisable) */ |
282 |
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VIEW *vn; |
283 |
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int hr, vr; |
284 |
gregl |
3.4 |
{ |
285 |
gwlarson |
3.29 |
static int todo[MAXTODO+1]; |
286 |
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int n; |
287 |
gwlarson |
3.30 |
double er, eravg, d; |
288 |
gwlarson |
3.26 |
register HOLO *hp; |
289 |
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register int i; |
290 |
gwlarson |
3.29 |
/* find nearby sections */ |
291 |
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if (!(n = comptodo(todo, vn))) |
292 |
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return(NULL); |
293 |
gwlarson |
3.30 |
/* sort current beam list */ |
294 |
gwlarson |
3.21 |
cbeamsort(1); |
295 |
gwlarson |
3.30 |
/* add view to nearby sections */ |
296 |
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eravg = 0.; |
297 |
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for (i = 0; i < n; i++) { |
298 |
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hp = hdlist[todo[i]]; |
299 |
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if (MEYERNG > FTINY) |
300 |
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er = MEYERNG/3. / VLEN(hp->wg[0]) + |
301 |
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MEYERNG/3. / VLEN(hp->wg[1]) + |
302 |
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MEYERNG/3. / VLEN(hp->wg[2]) ; |
303 |
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else |
304 |
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er = 0.; |
305 |
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if (!addview(todo[i], vn, 0.25*er, hr, vr)) { |
306 |
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register int j; /* whoops! */ |
307 |
gwlarson |
3.29 |
n--; /* delete from list */ |
308 |
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for (j = i--; j <= n; j++) |
309 |
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todo[j] = todo[j+1]; |
310 |
gwlarson |
3.30 |
} else |
311 |
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eravg += er; |
312 |
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} |
313 |
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if (eravg <= FTINY) |
314 |
gwlarson |
3.29 |
return(todo); |
315 |
gwlarson |
3.30 |
/* compute average eye range */ |
316 |
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eravg /= (double)n; |
317 |
gwlarson |
3.26 |
/* add to current eye position */ |
318 |
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if (cureye.rng <= FTINY) { |
319 |
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VCOPY(cureye.vpt, vn->vp); |
320 |
gwlarson |
3.30 |
cureye.rng = eravg; |
321 |
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} else if ((d = sqrt(dist2(vn->vp,cureye.vpt))) + eravg > cureye.rng) { |
322 |
gwlarson |
3.26 |
for (i = 3; i--; ) |
323 |
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cureye.vpt[i] = 0.5*(cureye.vpt[i] + vn->vp[i]); |
324 |
gwlarson |
3.30 |
cureye.rng = 0.5*(cureye.rng + eravg + d); |
325 |
gwlarson |
3.26 |
} |
326 |
gwlarson |
3.29 |
return(todo); |
327 |
gregl |
3.4 |
} |
328 |
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329 |
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330 |
gwlarson |
3.21 |
int |
331 |
|
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beam_sync(all) /* update beam list on server */ |
332 |
|
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int all; |
333 |
gregl |
3.1 |
{ |
334 |
gwlarson |
3.26 |
/* set new eye position */ |
335 |
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serv_request(DR_VIEWPOINT, sizeof(VIEWPOINT), (char *)&cureye); |
336 |
gwlarson |
3.24 |
/* sort list (put orphans at end) */ |
337 |
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cbeamsort(all < 0); |
338 |
gwlarson |
3.26 |
/* send beam request */ |
339 |
gwlarson |
3.21 |
if (all) |
340 |
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cbeamop(DR_NEWSET, cbeam, ncbeams); |
341 |
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else |
342 |
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cbeamop(DR_ADJSET, cbeam, ncbeams+xcbeams); |
343 |
gregl |
3.1 |
xcbeams = 0; /* truncate our list */ |
344 |
gwlarson |
3.21 |
return(ncbeams); |
345 |
gregl |
3.1 |
} |