1 |
gwlarson |
3.23 |
#ifndef lint |
2 |
schorsch |
3.38 |
static const char RCSid[] = "$Id: rholo3.c,v 3.37 2003/06/20 00:25:49 greg Exp $"; |
3 |
gwlarson |
3.23 |
#endif |
4 |
gregl |
3.1 |
/* |
5 |
|
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* Routines for tracking beam compuatations |
6 |
|
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*/ |
7 |
|
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|
8 |
schorsch |
3.38 |
#include <string.h> |
9 |
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|
10 |
gregl |
3.1 |
#include "rholo.h" |
11 |
gwlarson |
3.31 |
#include "view.h" |
12 |
gregl |
3.1 |
|
13 |
gwlarson |
3.27 |
#ifndef NFRAG2CHUNK |
14 |
|
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#define NFRAG2CHUNK 4096 /* number of fragments to start chunking */ |
15 |
|
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#endif |
16 |
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17 |
|
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#ifndef abs |
18 |
gregl |
3.1 |
#define abs(x) ((x) > 0 ? (x) : -(x)) |
19 |
gwlarson |
3.27 |
#endif |
20 |
|
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#ifndef sgn |
21 |
gregl |
3.1 |
#define sgn(x) ((x) > 0 ? 1 : (x) < 0 ? -1 : 0) |
22 |
gwlarson |
3.27 |
#endif |
23 |
gregl |
3.1 |
|
24 |
gwlarson |
3.27 |
#define rchunk(n) (((n)+(RPACKSIZ/2))/RPACKSIZ) |
25 |
|
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|
26 |
gwlarson |
3.28 |
extern time_t time(); |
27 |
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|
28 |
gwlarson |
3.30 |
int chunkycmp = 0; /* clump beams together on disk */ |
29 |
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30 |
gregl |
3.4 |
static PACKHEAD *complist=NULL; /* list of beams to compute */ |
31 |
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static int complen=0; /* length of complist */ |
32 |
|
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static int listpos=0; /* current list position for next_packet */ |
33 |
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static int lastin= -1; /* last ordered position in list */ |
34 |
gregl |
3.1 |
|
35 |
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|
36 |
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int |
37 |
gwlarson |
3.23 |
beamcmp(b0, b1) /* comparison for compute order */ |
38 |
gregl |
3.2 |
register PACKHEAD *b0, *b1; |
39 |
|
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{ |
40 |
gwlarson |
3.27 |
BEAMI *bip0, *bip1; |
41 |
|
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register long c; |
42 |
|
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/* first check desired quantities */ |
43 |
gwlarson |
3.30 |
if (chunkycmp) |
44 |
gwlarson |
3.28 |
c = rchunk(b1->nr)*(rchunk(b0->nc)+1L) - |
45 |
|
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rchunk(b0->nr)*(rchunk(b1->nc)+1L); |
46 |
gwlarson |
3.27 |
else |
47 |
gwlarson |
3.28 |
c = b1->nr*(b0->nc+1L) - b0->nr*(b1->nc+1L); |
48 |
|
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if (c > 0) return(1); |
49 |
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if (c < 0) return(-1); |
50 |
gwlarson |
3.27 |
/* only one file, so skip the following: */ |
51 |
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#if 0 |
52 |
|
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/* next, check file descriptors */ |
53 |
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c = hdlist[b0->hd]->fd - hdlist[b1->hd]->fd; |
54 |
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if (c) return(c); |
55 |
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#endif |
56 |
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/* finally, check file positions */ |
57 |
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bip0 = &hdlist[b0->hd]->bi[b0->bi]; |
58 |
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bip1 = &hdlist[b1->hd]->bi[b1->bi]; |
59 |
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/* put diskless beams last */ |
60 |
|
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if (!bip0->nrd) |
61 |
|
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return(bip1->nrd > 0); |
62 |
|
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if (!bip1->nrd) |
63 |
|
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return(-1); |
64 |
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c = bip0->fo - bip1->fo; |
65 |
|
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return(c < 0 ? -1 : c > 0); |
66 |
gregl |
3.2 |
} |
67 |
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|
68 |
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|
69 |
gregl |
3.14 |
int |
70 |
gwlarson |
3.23 |
beamidcmp(b0, b1) /* comparison for beam searching */ |
71 |
|
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register PACKHEAD *b0, *b1; |
72 |
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{ |
73 |
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register int c = b0->hd - b1->hd; |
74 |
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|
75 |
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if (c) return(c); |
76 |
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return(b0->bi - b1->bi); |
77 |
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} |
78 |
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79 |
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|
80 |
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int |
81 |
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dispbeam(b, hb) /* display a holodeck beam */ |
82 |
gregl |
3.14 |
register BEAM *b; |
83 |
gwlarson |
3.23 |
register HDBEAMI *hb; |
84 |
gregl |
3.14 |
{ |
85 |
|
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static int n = 0; |
86 |
|
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static PACKHEAD *p = NULL; |
87 |
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|
88 |
|
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if (b == NULL) |
89 |
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return; |
90 |
|
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if (b->nrm > n) { /* (re)allocate packet holder */ |
91 |
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n = b->nrm; |
92 |
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if (p == NULL) p = (PACKHEAD *)malloc(packsiz(n)); |
93 |
greg |
3.35 |
else p = (PACKHEAD *)realloc((void *)p, packsiz(n)); |
94 |
gwlarson |
3.31 |
CHECK(p==NULL, SYSTEM, "out of memory in dispbeam"); |
95 |
gregl |
3.14 |
} |
96 |
|
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/* assign packet fields */ |
97 |
schorsch |
3.38 |
memcpy((void *)packra(p), (void *)hdbray(b), b->nrm*sizeof(RAYVAL)); |
98 |
gregl |
3.14 |
p->nr = p->nc = b->nrm; |
99 |
gwlarson |
3.23 |
for (p->hd = 0; hdlist[p->hd] != hb->h; p->hd++) |
100 |
gregl |
3.14 |
if (hdlist[p->hd] == NULL) |
101 |
|
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error(CONSISTENCY, "unregistered holodeck in dispbeam"); |
102 |
gwlarson |
3.23 |
p->bi = hb->b; |
103 |
gregl |
3.14 |
disp_packet(p); /* display it */ |
104 |
gwlarson |
3.29 |
if (n >= 1024) { /* free ridiculous packets */ |
105 |
greg |
3.34 |
free((void *)p); |
106 |
gwlarson |
3.29 |
p = NULL; n = 0; |
107 |
|
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} |
108 |
gregl |
3.14 |
} |
109 |
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|
110 |
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|
111 |
gregl |
3.2 |
bundle_set(op, clist, nents) /* bundle set operation */ |
112 |
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int op; |
113 |
gwlarson |
3.23 |
PACKHEAD *clist; |
114 |
gregl |
3.2 |
int nents; |
115 |
|
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{ |
116 |
gwlarson |
3.23 |
int oldnr, n; |
117 |
|
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HDBEAMI *hbarr; |
118 |
|
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register PACKHEAD *csm; |
119 |
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register int i; |
120 |
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/* search for common members */ |
121 |
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for (csm = clist+nents; csm-- > clist; ) |
122 |
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csm->nc = -1; |
123 |
greg |
3.36 |
qsort((void *)clist, nents, sizeof(PACKHEAD), beamidcmp); |
124 |
gwlarson |
3.23 |
for (i = 0; i < complen; i++) { |
125 |
greg |
3.36 |
csm = (PACKHEAD *)bsearch((void *)(complist+i), (void *)clist, |
126 |
gwlarson |
3.23 |
nents, sizeof(PACKHEAD), beamidcmp); |
127 |
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if (csm == NULL) |
128 |
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continue; |
129 |
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oldnr = complist[i].nr; |
130 |
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csm->nc = complist[i].nc; |
131 |
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switch (op) { |
132 |
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case BS_ADD: /* add to count */ |
133 |
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complist[i].nr += csm->nr; |
134 |
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csm->nr = 0; |
135 |
|
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break; |
136 |
gwlarson |
3.31 |
case BS_MAX: /* maximum of counts */ |
137 |
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if (csm->nr > complist[i].nr) |
138 |
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complist[i].nr = csm->nr; |
139 |
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csm->nr = 0; |
140 |
|
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break; |
141 |
gwlarson |
3.23 |
case BS_ADJ: /* reset count */ |
142 |
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complist[i].nr = csm->nr; |
143 |
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csm->nr = 0; |
144 |
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break; |
145 |
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case BS_DEL: /* delete count */ |
146 |
|
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if (csm->nr == 0 || csm->nr >= complist[i].nr) |
147 |
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complist[i].nr = 0; |
148 |
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else |
149 |
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complist[i].nr -= csm->nr; |
150 |
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break; |
151 |
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} |
152 |
|
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if (complist[i].nr != oldnr) |
153 |
|
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lastin = -1; /* flag sort */ |
154 |
gregl |
3.20 |
} |
155 |
gwlarson |
3.24 |
/* record computed rays for uncommon beams */ |
156 |
gwlarson |
3.23 |
for (csm = clist+nents; csm-- > clist; ) |
157 |
|
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if (csm->nc < 0) |
158 |
|
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csm->nc = bnrays(hdlist[csm->hd], csm->bi); |
159 |
gregl |
3.20 |
/* complete list operations */ |
160 |
gregl |
3.2 |
switch (op) { |
161 |
|
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case BS_NEW: /* new computation set */ |
162 |
gwlarson |
3.21 |
listpos = 0; lastin = -1; |
163 |
gregl |
3.20 |
if (complen) /* free old list */ |
164 |
greg |
3.34 |
free((void *)complist); |
165 |
gregl |
3.20 |
complist = NULL; |
166 |
|
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if (!(complen = nents)) |
167 |
gregl |
3.2 |
return; |
168 |
|
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complist = (PACKHEAD *)malloc(nents*sizeof(PACKHEAD)); |
169 |
|
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if (complist == NULL) |
170 |
|
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goto memerr; |
171 |
schorsch |
3.38 |
memcpy((void *)complist, (void *)clist, nents*sizeof(PACKHEAD)); |
172 |
gregl |
3.2 |
break; |
173 |
|
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case BS_ADD: /* add to computation set */ |
174 |
gwlarson |
3.31 |
case BS_MAX: /* maximum of quantities */ |
175 |
gregl |
3.11 |
case BS_ADJ: /* adjust set quantities */ |
176 |
gregl |
3.2 |
if (nents <= 0) |
177 |
|
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return; |
178 |
gregl |
3.20 |
sortcomplist(); /* sort updated list & new entries */ |
179 |
greg |
3.36 |
qsort((void *)clist, nents, sizeof(PACKHEAD), beamcmp); |
180 |
gregl |
3.2 |
/* what can't we satisfy? */ |
181 |
gwlarson |
3.23 |
for (i = nents, csm = clist; i-- && csm->nr > csm->nc; csm++) |
182 |
gregl |
3.2 |
; |
183 |
gwlarson |
3.23 |
n = csm - clist; |
184 |
gwlarson |
3.31 |
if (op != BS_ADD) { /* don't regenerate adjusted beams */ |
185 |
gwlarson |
3.24 |
for (++i; i-- && csm->nr > 0; csm++) |
186 |
gwlarson |
3.22 |
; |
187 |
gwlarson |
3.24 |
nents = csm - clist; |
188 |
gwlarson |
3.22 |
} |
189 |
gregl |
3.2 |
if (n) { /* allocate space for merged list */ |
190 |
|
|
PACKHEAD *newlist; |
191 |
|
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newlist = (PACKHEAD *)malloc( |
192 |
|
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(complen+n)*sizeof(PACKHEAD) ); |
193 |
|
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if (newlist == NULL) |
194 |
|
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goto memerr; |
195 |
|
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/* merge lists */ |
196 |
|
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mergeclists(newlist, clist, n, complist, complen); |
197 |
|
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if (complen) |
198 |
greg |
3.34 |
free((void *)complist); |
199 |
gregl |
3.2 |
complist = newlist; |
200 |
|
|
complen += n; |
201 |
|
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} |
202 |
|
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listpos = 0; |
203 |
|
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lastin = complen-1; /* list is now sorted */ |
204 |
|
|
break; |
205 |
|
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case BS_DEL: /* delete from computation set */ |
206 |
gregl |
3.20 |
return; /* already done */ |
207 |
gregl |
3.2 |
default: |
208 |
|
|
error(CONSISTENCY, "bundle_set called with unknown operation"); |
209 |
|
|
} |
210 |
gwlarson |
3.27 |
if (outdev == NULL || !nents) /* nothing to display? */ |
211 |
gwlarson |
3.22 |
return; |
212 |
|
|
/* load and display beams we have */ |
213 |
gwlarson |
3.23 |
hbarr = (HDBEAMI *)malloc(nents*sizeof(HDBEAMI)); |
214 |
|
|
for (i = nents; i--; ) { |
215 |
|
|
hbarr[i].h = hdlist[clist[i].hd]; |
216 |
|
|
hbarr[i].b = clist[i].bi; |
217 |
gregl |
3.11 |
} |
218 |
gwlarson |
3.23 |
hdloadbeams(hbarr, nents, dispbeam); |
219 |
greg |
3.34 |
free((void *)hbarr); |
220 |
gwlarson |
3.27 |
if (hdfragflags&FF_READ) { |
221 |
|
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listpos = 0; |
222 |
|
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lastin = -1; /* need to re-sort list */ |
223 |
|
|
} |
224 |
gregl |
3.2 |
return; |
225 |
|
|
memerr: |
226 |
|
|
error(SYSTEM, "out of memory in bundle_set"); |
227 |
|
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} |
228 |
|
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|
229 |
|
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|
230 |
gregl |
3.13 |
double |
231 |
|
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beamvolume(hp, bi) /* compute approximate volume of a beam */ |
232 |
gregl |
3.1 |
HOLO *hp; |
233 |
gregl |
3.13 |
int bi; |
234 |
gregl |
3.1 |
{ |
235 |
gregl |
3.13 |
GCOORD gc[2]; |
236 |
|
|
FVECT cp[4], edgeA, edgeB, cent[2]; |
237 |
|
|
FVECT v, crossp[2], diffv; |
238 |
|
|
double vol[2]; |
239 |
|
|
register int i; |
240 |
|
|
/* get grid coordinates */ |
241 |
|
|
if (!hdbcoord(gc, hp, bi)) |
242 |
|
|
error(CONSISTENCY, "bad beam index in beamvolume"); |
243 |
|
|
for (i = 0; i < 2; i++) { /* compute cell area vectors */ |
244 |
|
|
hdcell(cp, hp, gc+i); |
245 |
|
|
VSUM(edgeA, cp[1], cp[0], -1.0); |
246 |
|
|
VSUM(edgeB, cp[3], cp[1], -1.0); |
247 |
|
|
fcross(crossp[i], edgeA, edgeB); |
248 |
|
|
/* compute center */ |
249 |
|
|
cent[i][0] = 0.5*(cp[0][0] + cp[2][0]); |
250 |
|
|
cent[i][1] = 0.5*(cp[0][1] + cp[2][1]); |
251 |
|
|
cent[i][2] = 0.5*(cp[0][2] + cp[2][2]); |
252 |
gregl |
3.1 |
} |
253 |
gregl |
3.13 |
/* compute difference vector */ |
254 |
|
|
VSUM(diffv, cent[1], cent[0], -1.0); |
255 |
|
|
for (i = 0; i < 2; i++) { /* compute volume contributions */ |
256 |
gregl |
3.15 |
vol[i] = 0.5*DOT(crossp[i], diffv); |
257 |
gregl |
3.13 |
if (vol[i] < 0.) vol[i] = -vol[i]; |
258 |
|
|
} |
259 |
|
|
return(vol[0] + vol[1]); /* return total volume */ |
260 |
gregl |
3.1 |
} |
261 |
|
|
|
262 |
|
|
|
263 |
gwlarson |
3.31 |
ambient_list() /* compute ambient beam list */ |
264 |
gregl |
3.1 |
{ |
265 |
greg |
3.37 |
int32 wtotal, minrt; |
266 |
gregl |
3.1 |
double frac; |
267 |
gregl |
3.13 |
int i; |
268 |
|
|
register int j, k; |
269 |
gwlarson |
3.31 |
|
270 |
gregl |
3.1 |
complen = 0; |
271 |
|
|
for (j = 0; hdlist[j] != NULL; j++) |
272 |
|
|
complen += nbeams(hdlist[j]); |
273 |
|
|
complist = (PACKHEAD *)malloc(complen*sizeof(PACKHEAD)); |
274 |
gwlarson |
3.31 |
CHECK(complist==NULL, SYSTEM, "out of memory in ambient_list"); |
275 |
gregl |
3.1 |
/* compute beam weights */ |
276 |
gwlarson |
3.32 |
k = 0; wtotal = 0; |
277 |
gregl |
3.13 |
for (j = 0; hdlist[j] != NULL; j++) { |
278 |
gregl |
3.19 |
frac = 512. * VLEN(hdlist[j]->wg[0]) * |
279 |
|
|
VLEN(hdlist[j]->wg[1]) * |
280 |
|
|
VLEN(hdlist[j]->wg[2]); |
281 |
gregl |
3.1 |
for (i = nbeams(hdlist[j]); i > 0; i--) { |
282 |
|
|
complist[k].hd = j; |
283 |
|
|
complist[k].bi = i; |
284 |
gregl |
3.13 |
complist[k].nr = frac*beamvolume(hdlist[j], i) + 0.5; |
285 |
gregl |
3.18 |
complist[k].nc = bnrays(hdlist[j], i); |
286 |
gregl |
3.1 |
wtotal += complist[k++].nr; |
287 |
|
|
} |
288 |
gregl |
3.13 |
} |
289 |
gwlarson |
3.31 |
/* adjust sample weights */ |
290 |
gregl |
3.12 |
if (vdef(DISKSPACE)) |
291 |
gwlarson |
3.32 |
frac = 1024.*1024.*vflt(DISKSPACE) / (wtotal*sizeof(RAYVAL)); |
292 |
gregl |
3.12 |
else |
293 |
gwlarson |
3.32 |
frac = 1024.*1024.*2048. / (wtotal*sizeof(RAYVAL)); |
294 |
|
|
minrt = .02*frac*wtotal/complen + .5; /* heuristic mimimum */ |
295 |
|
|
if (minrt > RPACKSIZ) |
296 |
|
|
minrt = RPACKSIZ; |
297 |
|
|
for (k = complen; k--; ) |
298 |
|
|
if ((complist[k].nr = frac*complist[k].nr + 0.5) < minrt) |
299 |
|
|
complist[k].nr = minrt; |
300 |
gwlarson |
3.31 |
listpos = 0; lastin = -1; /* flag initial sort */ |
301 |
|
|
} |
302 |
|
|
|
303 |
|
|
|
304 |
|
|
view_list(fp) /* assign beam priority from view list */ |
305 |
|
|
FILE *fp; |
306 |
|
|
{ |
307 |
|
|
double pa = 1.; |
308 |
|
|
VIEW curview; |
309 |
|
|
int xr, yr; |
310 |
|
|
char *err; |
311 |
|
|
BEAMLIST blist; |
312 |
|
|
|
313 |
|
|
copystruct(&curview, &stdview); |
314 |
|
|
while (nextview(&curview, fp) != EOF) { |
315 |
|
|
if ((err = setview(&curview)) != NULL) { |
316 |
|
|
error(WARNING, err); |
317 |
|
|
continue; |
318 |
|
|
} |
319 |
|
|
xr = yr = 1024; |
320 |
|
|
normaspect(viewaspect(&curview), &pa, &xr, &yr); |
321 |
|
|
viewbeams(&curview, xr, yr, &blist); |
322 |
|
|
bundle_set(BS_MAX, blist.bl, blist.nb); |
323 |
greg |
3.34 |
free((void *)blist.bl); |
324 |
gwlarson |
3.31 |
} |
325 |
|
|
} |
326 |
|
|
|
327 |
|
|
|
328 |
|
|
init_global() /* initialize global ray computation */ |
329 |
|
|
{ |
330 |
|
|
register int k; |
331 |
|
|
/* free old list and empty queue */ |
332 |
|
|
if (complen > 0) { |
333 |
greg |
3.34 |
free((void *)complist); |
334 |
gwlarson |
3.31 |
done_packets(flush_queue()); |
335 |
|
|
} |
336 |
|
|
/* reseed random number generator */ |
337 |
|
|
srandom(time(NULL)); |
338 |
|
|
/* allocate beam list */ |
339 |
|
|
if (readinp) |
340 |
|
|
view_list(stdin); |
341 |
|
|
else |
342 |
|
|
ambient_list(); |
343 |
gwlarson |
3.25 |
/* no view vicinity */ |
344 |
|
|
myeye.rng = 0; |
345 |
gregl |
3.1 |
} |
346 |
|
|
|
347 |
|
|
|
348 |
|
|
mergeclists(cdest, cl1, n1, cl2, n2) /* merge two sorted lists */ |
349 |
gregl |
3.16 |
register PACKHEAD *cdest; |
350 |
|
|
register PACKHEAD *cl1, *cl2; |
351 |
gregl |
3.1 |
int n1, n2; |
352 |
|
|
{ |
353 |
gregl |
3.16 |
register int cmp; |
354 |
gregl |
3.1 |
|
355 |
|
|
while (n1 | n2) { |
356 |
|
|
if (!n1) cmp = 1; |
357 |
|
|
else if (!n2) cmp = -1; |
358 |
|
|
else cmp = beamcmp(cl1, cl2); |
359 |
|
|
if (cmp > 0) { |
360 |
|
|
copystruct(cdest, cl2); |
361 |
|
|
cl2++; n2--; |
362 |
|
|
} else { |
363 |
|
|
copystruct(cdest, cl1); |
364 |
|
|
cl1++; n1--; |
365 |
|
|
} |
366 |
|
|
cdest++; |
367 |
|
|
} |
368 |
|
|
} |
369 |
|
|
|
370 |
|
|
|
371 |
|
|
sortcomplist() /* fix our list order */ |
372 |
|
|
{ |
373 |
|
|
PACKHEAD *list2; |
374 |
gwlarson |
3.27 |
int listlen; |
375 |
gregl |
3.2 |
register int i; |
376 |
|
|
|
377 |
gregl |
3.3 |
if (complen <= 0) /* check to see if there is even a list */ |
378 |
gregl |
3.2 |
return; |
379 |
gwlarson |
3.30 |
if (!chunkycmp) /* check to see if fragment list is full */ |
380 |
gwlarson |
3.27 |
if (!hdfragOK(hdlist[0]->fd, &listlen, NULL) |
381 |
|
|
#if NFRAG2CHUNK |
382 |
|
|
|| listlen >= NFRAG2CHUNK |
383 |
|
|
#endif |
384 |
|
|
) { |
385 |
gwlarson |
3.30 |
chunkycmp++; /* use "chunky" comparison */ |
386 |
|
|
lastin = -1; /* need to re-sort list */ |
387 |
gwlarson |
3.27 |
#ifdef DEBUG |
388 |
|
|
error(WARNING, "using chunky comparison mode"); |
389 |
|
|
#endif |
390 |
|
|
} |
391 |
gregl |
3.6 |
if (lastin < 0 || listpos*4 >= complen*3) |
392 |
greg |
3.36 |
qsort((void *)complist, complen, sizeof(PACKHEAD), beamcmp); |
393 |
gregl |
3.1 |
else if (listpos) { /* else sort and merge sublist */ |
394 |
|
|
list2 = (PACKHEAD *)malloc(listpos*sizeof(PACKHEAD)); |
395 |
gwlarson |
3.31 |
CHECK(list2==NULL, SYSTEM, "out of memory in sortcomplist"); |
396 |
schorsch |
3.38 |
memcpy((void *)list2,(void *)complist,listpos*sizeof(PACKHEAD)); |
397 |
greg |
3.36 |
qsort((void *)list2, listpos, sizeof(PACKHEAD), beamcmp); |
398 |
gregl |
3.1 |
mergeclists(complist, list2, listpos, |
399 |
|
|
complist+listpos, complen-listpos); |
400 |
greg |
3.34 |
free((void *)list2); |
401 |
gregl |
3.1 |
} |
402 |
gregl |
3.2 |
/* drop satisfied requests */ |
403 |
gregl |
3.11 |
for (i = complen; i-- && complist[i].nr <= complist[i].nc; ) |
404 |
gregl |
3.2 |
; |
405 |
gregl |
3.4 |
if (i < 0) { |
406 |
greg |
3.34 |
free((void *)complist); |
407 |
gregl |
3.4 |
complist = NULL; |
408 |
|
|
complen = 0; |
409 |
|
|
} else if (i < complen-1) { |
410 |
greg |
3.35 |
list2 = (PACKHEAD *)realloc((void *)complist, |
411 |
gregl |
3.2 |
(i+1)*sizeof(PACKHEAD)); |
412 |
gwlarson |
3.26 |
if (list2 != NULL) |
413 |
gregl |
3.2 |
complist = list2; |
414 |
gwlarson |
3.26 |
complen = i+1; |
415 |
gregl |
3.2 |
} |
416 |
|
|
listpos = 0; lastin = i; |
417 |
gregl |
3.1 |
} |
418 |
|
|
|
419 |
|
|
|
420 |
|
|
/* |
421 |
|
|
* The following routine works on the assumption that the bundle weights are |
422 |
|
|
* more or less evenly distributed, such that computing a packet causes |
423 |
|
|
* a given bundle to move way down in the computation order. We keep |
424 |
|
|
* track of where the computed bundle with the highest priority would end |
425 |
gwlarson |
3.27 |
* up, and if we get further in our compute list than this, we re-sort the |
426 |
gregl |
3.11 |
* list and start again from the beginning. Since |
427 |
|
|
* a merge sort is used, the sorting costs are minimal. |
428 |
gregl |
3.1 |
*/ |
429 |
gregl |
3.17 |
next_packet(p, n) /* prepare packet for computation */ |
430 |
gregl |
3.1 |
register PACKET *p; |
431 |
gregl |
3.17 |
int n; |
432 |
gregl |
3.1 |
{ |
433 |
|
|
register int i; |
434 |
|
|
|
435 |
gregl |
3.10 |
if (listpos > lastin) /* time to sort the list */ |
436 |
|
|
sortcomplist(); |
437 |
gregl |
3.1 |
if (complen <= 0) |
438 |
|
|
return(0); |
439 |
|
|
p->hd = complist[listpos].hd; |
440 |
|
|
p->bi = complist[listpos].bi; |
441 |
gregl |
3.11 |
p->nc = complist[listpos].nc; |
442 |
|
|
p->nr = complist[listpos].nr - p->nc; |
443 |
gregl |
3.1 |
if (p->nr <= 0) |
444 |
|
|
return(0); |
445 |
gwlarson |
3.28 |
DCHECK(n < 1 | n > RPACKSIZ, |
446 |
|
|
CONSISTENCY, "next_packet called with bad n value"); |
447 |
gregl |
3.17 |
if (p->nr > n) |
448 |
|
|
p->nr = n; |
449 |
gregl |
3.11 |
complist[listpos].nc += p->nr; /* find where this one would go */ |
450 |
gwlarson |
3.27 |
if (hdgetbeam(hdlist[p->hd], p->bi) != NULL) |
451 |
|
|
hdfreefrag(hdlist[p->hd], p->bi); |
452 |
gregl |
3.11 |
while (lastin > listpos && |
453 |
|
|
beamcmp(complist+lastin, complist+listpos) > 0) |
454 |
gregl |
3.1 |
lastin--; |
455 |
|
|
listpos++; |
456 |
|
|
return(1); |
457 |
|
|
} |