| 1 |
#ifndef lint
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| 2 |
static const char RCSid[] = "$Id: rholo3.c,v 3.42 2004/06/08 19:48:30 greg Exp $";
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| 3 |
#endif
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| 4 |
/*
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| 5 |
* Routines for tracking beam compuatations
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| 6 |
*/
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| 7 |
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| 8 |
#include "rholo.h"
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| 9 |
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| 10 |
#ifndef NFRAG2CHUNK
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| 11 |
#define NFRAG2CHUNK 4096 /* number of fragments to start chunking */
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| 12 |
#endif
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| 13 |
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| 14 |
#ifndef MAXADISK
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| 15 |
#define MAXADISK 10240. /* maximum holodeck size (Megs) for ambient */
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#endif
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| 17 |
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| 18 |
#ifndef abs
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#define abs(x) ((x) > 0 ? (x) : -(x))
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#endif
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| 21 |
#ifndef sgn
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#define sgn(x) ((x) > 0 ? 1 : (x) < 0 ? -1 : 0)
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#endif
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| 24 |
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| 25 |
#define rchunk(n) (((n)+(RPACKSIZ/2))/RPACKSIZ)
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| 27 |
int chunkycmp = 0; /* clump beams together on disk */
|
| 28 |
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| 29 |
static PACKHEAD *complist=NULL; /* list of beams to compute */
|
| 30 |
static int complen=0; /* length of complist */
|
| 31 |
static int listpos=0; /* current list position for next_packet */
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| 32 |
static int lastin= -1; /* last ordered position in list */
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| 33 |
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| 34 |
static void sortcomplist(void);
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| 35 |
static void mergeclists(PACKHEAD *cdest, PACKHEAD *cl1, int n1, PACKHEAD *cl2, int n2);
|
| 36 |
static void view_list(FILE *fp);
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| 37 |
static void ambient_list(void);
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| 38 |
static double beamvolume(HOLO *hp, int bi);
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| 39 |
static void dispbeam(BEAM *b, HDBEAMI *hb);
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| 40 |
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| 41 |
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| 42 |
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| 43 |
static int
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| 44 |
beamcmp(b0, b1) /* comparison for compute order */
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| 45 |
register PACKHEAD *b0, *b1;
|
| 46 |
{
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| 47 |
BEAMI *bip0, *bip1;
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| 48 |
register long c;
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| 49 |
/* first check desired quantities */
|
| 50 |
if (chunkycmp)
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| 51 |
c = rchunk(b1->nr)*(rchunk(b0->nc)+1L) -
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rchunk(b0->nr)*(rchunk(b1->nc)+1L);
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else
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c = b1->nr*(b0->nc+1L) - b0->nr*(b1->nc+1L);
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if (c > 0) return(1);
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| 56 |
if (c < 0) return(-1);
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| 57 |
/* only one file, so skip the following: */
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| 58 |
#if 0
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/* next, check file descriptors */
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| 60 |
c = hdlist[b0->hd]->fd - hdlist[b1->hd]->fd;
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| 61 |
if (c) return(c);
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| 62 |
#endif
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| 63 |
/* finally, check file positions */
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| 64 |
bip0 = &hdlist[b0->hd]->bi[b0->bi];
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| 65 |
bip1 = &hdlist[b1->hd]->bi[b1->bi];
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/* put diskless beams last */
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| 67 |
if (!bip0->nrd)
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| 68 |
return(bip1->nrd > 0);
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| 69 |
if (!bip1->nrd)
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| 70 |
return(-1);
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| 71 |
c = bip0->fo - bip1->fo;
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| 72 |
return(c < 0 ? -1 : c > 0);
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| 73 |
}
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| 74 |
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| 75 |
|
| 76 |
int
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| 77 |
beamidcmp(b0, b1) /* comparison for beam searching */
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| 78 |
register PACKHEAD *b0, *b1;
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| 79 |
{
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| 80 |
register int c = b0->hd - b1->hd;
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| 81 |
|
| 82 |
if (c) return(c);
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| 83 |
return(b0->bi - b1->bi);
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| 84 |
}
|
| 85 |
|
| 86 |
|
| 87 |
static void
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| 88 |
dispbeam( /* display a holodeck beam */
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| 89 |
register BEAM *b,
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| 90 |
register HDBEAMI *hb
|
| 91 |
)
|
| 92 |
{
|
| 93 |
static int n = 0;
|
| 94 |
static PACKHEAD *p = NULL;
|
| 95 |
|
| 96 |
if (b == NULL)
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| 97 |
return;
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| 98 |
if (b->nrm > n) { /* (re)allocate packet holder */
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| 99 |
n = b->nrm;
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| 100 |
if (p == NULL) p = (PACKHEAD *)malloc(packsiz(n));
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| 101 |
else p = (PACKHEAD *)realloc((void *)p, packsiz(n));
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| 102 |
CHECK(p==NULL, SYSTEM, "out of memory in dispbeam");
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| 103 |
}
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| 104 |
/* assign packet fields */
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memcpy((void *)packra(p), (void *)hdbray(b), b->nrm*sizeof(RAYVAL));
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| 106 |
p->nr = p->nc = b->nrm;
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| 107 |
for (p->hd = 0; hdlist[p->hd] != hb->h; p->hd++)
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| 108 |
if (hdlist[p->hd] == NULL)
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error(CONSISTENCY, "unregistered holodeck in dispbeam");
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| 110 |
p->bi = hb->b;
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disp_packet(p); /* display it */
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if (n >= 1024) { /* free ridiculous packets */
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free((void *)p);
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p = NULL; n = 0;
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| 115 |
}
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| 116 |
}
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| 118 |
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| 119 |
extern void
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bundle_set( /* bundle set operation */
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| 121 |
int op,
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| 122 |
PACKHEAD *clist,
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| 123 |
int nents
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| 124 |
)
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| 125 |
{
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| 126 |
int oldnr, n;
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| 127 |
HDBEAMI *hbarr;
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| 128 |
register PACKHEAD *csm;
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| 129 |
register int i;
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/* search for common members */
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| 131 |
for (csm = clist+nents; csm-- > clist; )
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| 132 |
csm->nc = -1;
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qsort((void *)clist, nents, sizeof(PACKHEAD), beamidcmp);
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for (i = 0; i < complen; i++) {
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| 135 |
csm = (PACKHEAD *)bsearch((void *)(complist+i), (void *)clist,
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| 136 |
nents, sizeof(PACKHEAD), beamidcmp);
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if (csm == NULL)
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continue;
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oldnr = complist[i].nr;
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csm->nc = complist[i].nc;
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switch (op) {
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case BS_ADD: /* add to count */
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complist[i].nr += csm->nr;
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csm->nr = 0;
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break;
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case BS_MAX: /* maximum of counts */
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if (csm->nr > complist[i].nr)
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complist[i].nr = csm->nr;
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csm->nr = 0;
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break;
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case BS_ADJ: /* reset count */
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complist[i].nr = csm->nr;
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csm->nr = 0;
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break;
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case BS_DEL: /* delete count */
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if (csm->nr == 0 || csm->nr >= complist[i].nr)
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complist[i].nr = 0;
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else
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complist[i].nr -= csm->nr;
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break;
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}
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if (complist[i].nr != oldnr)
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lastin = -1; /* flag sort */
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}
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/* record computed rays for uncommon beams */
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for (csm = clist+nents; csm-- > clist; )
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if (csm->nc < 0)
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csm->nc = bnrays(hdlist[csm->hd], csm->bi);
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/* complete list operations */
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switch (op) {
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case BS_NEW: /* new computation set */
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listpos = 0; lastin = -1;
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if (complen) /* free old list */
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free((void *)complist);
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complist = NULL;
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if (!(complen = nents))
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return;
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| 178 |
complist = (PACKHEAD *)malloc(nents*sizeof(PACKHEAD));
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if (complist == NULL)
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goto memerr;
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| 181 |
memcpy((void *)complist, (void *)clist, nents*sizeof(PACKHEAD));
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break;
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case BS_ADD: /* add to computation set */
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case BS_MAX: /* maximum of quantities */
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case BS_ADJ: /* adjust set quantities */
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if (nents <= 0)
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return;
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sortcomplist(); /* sort updated list & new entries */
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qsort((void *)clist, nents, sizeof(PACKHEAD), beamcmp);
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/* what can't we satisfy? */
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for (i = nents, csm = clist; i-- && csm->nr > csm->nc; csm++)
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;
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n = csm - clist;
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if (op != BS_ADD) { /* don't regenerate adjusted beams */
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for (++i; i-- && csm->nr > 0; csm++)
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;
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nents = csm - clist;
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}
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if (n) { /* allocate space for merged list */
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PACKHEAD *newlist;
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newlist = (PACKHEAD *)malloc(
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(complen+n)*sizeof(PACKHEAD) );
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if (newlist == NULL)
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goto memerr;
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/* merge lists */
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mergeclists(newlist, clist, n, complist, complen);
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if (complen)
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free((void *)complist);
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complist = newlist;
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complen += n;
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}
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listpos = 0;
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lastin = complen-1; /* list is now sorted */
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break;
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case BS_DEL: /* delete from computation set */
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return; /* already done */
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default:
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error(CONSISTENCY, "bundle_set called with unknown operation");
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}
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if (outdev == NULL || !nents) /* nothing to display? */
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return;
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/* load and display beams we have */
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hbarr = (HDBEAMI *)malloc(nents*sizeof(HDBEAMI));
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for (i = nents; i--; ) {
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hbarr[i].h = hdlist[clist[i].hd];
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hbarr[i].b = clist[i].bi;
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}
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hdloadbeams(hbarr, nents, dispbeam);
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free((void *)hbarr);
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if (hdfragflags&FF_READ) {
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listpos = 0;
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lastin = -1; /* need to re-sort list */
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}
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return;
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memerr:
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error(SYSTEM, "out of memory in bundle_set");
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}
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static double
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beamvolume( /* compute approximate volume of a beam */
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HOLO *hp,
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int bi
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)
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{
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GCOORD gc[2];
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| 247 |
FVECT cp[4], edgeA, edgeB, cent[2];
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| 248 |
FVECT crossp[2], diffv;
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| 249 |
double vol[2];
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| 250 |
register int i;
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| 251 |
/* get grid coordinates */
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| 252 |
if (!hdbcoord(gc, hp, bi))
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error(CONSISTENCY, "bad beam index in beamvolume");
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for (i = 0; i < 2; i++) { /* compute cell area vectors */
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hdcell(cp, hp, gc+i);
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VSUM(edgeA, cp[1], cp[0], -1.0);
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| 257 |
VSUM(edgeB, cp[3], cp[1], -1.0);
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| 258 |
fcross(crossp[i], edgeA, edgeB);
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| 259 |
/* compute center */
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| 260 |
cent[i][0] = 0.5*(cp[0][0] + cp[2][0]);
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| 261 |
cent[i][1] = 0.5*(cp[0][1] + cp[2][1]);
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| 262 |
cent[i][2] = 0.5*(cp[0][2] + cp[2][2]);
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| 263 |
}
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| 264 |
/* compute difference vector */
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| 265 |
VSUM(diffv, cent[1], cent[0], -1.0);
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| 266 |
for (i = 0; i < 2; i++) { /* compute volume contributions */
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| 267 |
vol[i] = 0.5*DOT(crossp[i], diffv);
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| 268 |
if (vol[i] < 0.) vol[i] = -vol[i];
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| 269 |
}
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| 270 |
return(vol[0] + vol[1]); /* return total volume */
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| 271 |
}
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| 272 |
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| 273 |
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| 274 |
static void
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ambient_list(void) /* compute ambient beam list */
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| 276 |
{
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| 277 |
int32 wtotal, minrt;
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| 278 |
double frac;
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| 279 |
int i;
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| 280 |
register int j, k;
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| 281 |
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| 282 |
complen = 0;
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| 283 |
for (j = 0; hdlist[j] != NULL; j++)
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| 284 |
complen += nbeams(hdlist[j]);
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| 285 |
complist = (PACKHEAD *)malloc(complen*sizeof(PACKHEAD));
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| 286 |
CHECK(complist==NULL, SYSTEM, "out of memory in ambient_list");
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| 287 |
/* compute beam weights */
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| 288 |
k = 0; wtotal = 0;
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| 289 |
for (j = 0; hdlist[j] != NULL; j++) {
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| 290 |
/* 512. arbitrary -- adjusted below */
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| 291 |
frac = 512. * VLEN(hdlist[j]->wg[0]) *
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| 292 |
VLEN(hdlist[j]->wg[1]) *
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| 293 |
VLEN(hdlist[j]->wg[2]);
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| 294 |
for (i = nbeams(hdlist[j]); i > 0; i--) {
|
| 295 |
complist[k].hd = j;
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| 296 |
complist[k].bi = i;
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| 297 |
complist[k].nr = frac*beamvolume(hdlist[j], i) + 0.5;
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| 298 |
complist[k].nc = bnrays(hdlist[j], i);
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| 299 |
wtotal += complist[k++].nr;
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| 300 |
}
|
| 301 |
}
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| 302 |
/* adjust sample weights */
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| 303 |
if (vdef(DISKSPACE))
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| 304 |
frac = 1024.*1024.*vflt(DISKSPACE) / (wtotal*sizeof(RAYVAL));
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| 305 |
else
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| 306 |
frac = 1024.*1024.*MAXADISK / (wtotal*sizeof(RAYVAL));
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| 307 |
minrt = .02*frac*wtotal/complen + .5; /* heuristic mimimum */
|
| 308 |
if (minrt > RPACKSIZ)
|
| 309 |
minrt = RPACKSIZ;
|
| 310 |
for (k = complen; k--; )
|
| 311 |
if ((complist[k].nr = frac*complist[k].nr + 0.5) < minrt)
|
| 312 |
complist[k].nr = minrt;
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| 313 |
listpos = 0; lastin = -1; /* flag initial sort */
|
| 314 |
}
|
| 315 |
|
| 316 |
|
| 317 |
static void
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| 318 |
view_list( /* assign beam priority from view list */
|
| 319 |
FILE *fp
|
| 320 |
)
|
| 321 |
{
|
| 322 |
double pa = 1.;
|
| 323 |
VIEW curview;
|
| 324 |
int xr, yr;
|
| 325 |
char *err;
|
| 326 |
BEAMLIST blist;
|
| 327 |
|
| 328 |
curview = stdview;
|
| 329 |
while (nextview(&curview, fp) != EOF) {
|
| 330 |
if ((err = setview(&curview)) != NULL) {
|
| 331 |
error(WARNING, err);
|
| 332 |
continue;
|
| 333 |
}
|
| 334 |
xr = yr = 1024;
|
| 335 |
normaspect(viewaspect(&curview), &pa, &xr, &yr);
|
| 336 |
viewbeams(&curview, xr, yr, &blist);
|
| 337 |
bundle_set(BS_MAX, blist.bl, blist.nb);
|
| 338 |
free((void *)blist.bl);
|
| 339 |
}
|
| 340 |
}
|
| 341 |
|
| 342 |
|
| 343 |
extern void
|
| 344 |
init_global(void) /* initialize global ray computation */
|
| 345 |
{
|
| 346 |
/* free old list and empty queue */
|
| 347 |
if (complen > 0) {
|
| 348 |
free((void *)complist);
|
| 349 |
done_packets(flush_queue());
|
| 350 |
}
|
| 351 |
/* reseed random number generator */
|
| 352 |
srandom(time(NULL));
|
| 353 |
/* allocate beam list */
|
| 354 |
if (readinp)
|
| 355 |
view_list(stdin);
|
| 356 |
else
|
| 357 |
ambient_list();
|
| 358 |
/* no view vicinity */
|
| 359 |
myeye.rng = 0;
|
| 360 |
}
|
| 361 |
|
| 362 |
|
| 363 |
static void
|
| 364 |
mergeclists( /* merge two sorted lists */
|
| 365 |
register PACKHEAD *cdest,
|
| 366 |
register PACKHEAD *cl1,
|
| 367 |
int n1,
|
| 368 |
register PACKHEAD *cl2,
|
| 369 |
int n2
|
| 370 |
)
|
| 371 |
{
|
| 372 |
register int cmp;
|
| 373 |
|
| 374 |
while (n1 | n2) {
|
| 375 |
if (!n1) cmp = 1;
|
| 376 |
else if (!n2) cmp = -1;
|
| 377 |
else cmp = beamcmp(cl1, cl2);
|
| 378 |
if (cmp > 0) {
|
| 379 |
*cdest = *cl2;
|
| 380 |
cl2++; n2--;
|
| 381 |
} else {
|
| 382 |
*cdest = *cl1;
|
| 383 |
cl1++; n1--;
|
| 384 |
}
|
| 385 |
cdest++;
|
| 386 |
}
|
| 387 |
}
|
| 388 |
|
| 389 |
|
| 390 |
static void
|
| 391 |
sortcomplist(void) /* fix our list order */
|
| 392 |
{
|
| 393 |
PACKHEAD *list2;
|
| 394 |
int listlen;
|
| 395 |
register int i;
|
| 396 |
|
| 397 |
if (complen <= 0) /* check to see if there is even a list */
|
| 398 |
return;
|
| 399 |
if (!chunkycmp) /* check to see if fragment list is full */
|
| 400 |
if (!hdfragOK(hdlist[0]->fd, &listlen, NULL)
|
| 401 |
#if NFRAG2CHUNK
|
| 402 |
|| listlen >= NFRAG2CHUNK
|
| 403 |
#endif
|
| 404 |
) {
|
| 405 |
chunkycmp++; /* use "chunky" comparison */
|
| 406 |
lastin = -1; /* need to re-sort list */
|
| 407 |
#ifdef DEBUG
|
| 408 |
error(WARNING, "using chunky comparison mode");
|
| 409 |
#endif
|
| 410 |
}
|
| 411 |
if (lastin < 0 || listpos*4 >= complen*3)
|
| 412 |
qsort((void *)complist, complen, sizeof(PACKHEAD), beamcmp);
|
| 413 |
else if (listpos) { /* else sort and merge sublist */
|
| 414 |
list2 = (PACKHEAD *)malloc(listpos*sizeof(PACKHEAD));
|
| 415 |
CHECK(list2==NULL, SYSTEM, "out of memory in sortcomplist");
|
| 416 |
memcpy((void *)list2,(void *)complist,listpos*sizeof(PACKHEAD));
|
| 417 |
qsort((void *)list2, listpos, sizeof(PACKHEAD), beamcmp);
|
| 418 |
mergeclists(complist, list2, listpos,
|
| 419 |
complist+listpos, complen-listpos);
|
| 420 |
free((void *)list2);
|
| 421 |
}
|
| 422 |
/* drop satisfied requests */
|
| 423 |
for (i = complen; i-- && complist[i].nr <= complist[i].nc; )
|
| 424 |
;
|
| 425 |
if (i < 0) {
|
| 426 |
free((void *)complist);
|
| 427 |
complist = NULL;
|
| 428 |
complen = 0;
|
| 429 |
} else if (i < complen-1) {
|
| 430 |
list2 = (PACKHEAD *)realloc((void *)complist,
|
| 431 |
(i+1)*sizeof(PACKHEAD));
|
| 432 |
if (list2 != NULL)
|
| 433 |
complist = list2;
|
| 434 |
complen = i+1;
|
| 435 |
}
|
| 436 |
listpos = 0; lastin = i;
|
| 437 |
}
|
| 438 |
|
| 439 |
|
| 440 |
/*
|
| 441 |
* The following routine works on the assumption that the bundle weights are
|
| 442 |
* more or less evenly distributed, such that computing a packet causes
|
| 443 |
* a given bundle to move way down in the computation order. We keep
|
| 444 |
* track of where the computed bundle with the highest priority would end
|
| 445 |
* up, and if we get further in our compute list than this, we re-sort the
|
| 446 |
* list and start again from the beginning. Since
|
| 447 |
* a merge sort is used, the sorting costs are minimal.
|
| 448 |
*/
|
| 449 |
extern int
|
| 450 |
next_packet( /* prepare packet for computation */
|
| 451 |
register PACKET *p,
|
| 452 |
int n
|
| 453 |
)
|
| 454 |
{
|
| 455 |
if (listpos > lastin) /* time to sort the list */
|
| 456 |
sortcomplist();
|
| 457 |
if (complen <= 0)
|
| 458 |
return(0);
|
| 459 |
p->hd = complist[listpos].hd;
|
| 460 |
p->bi = complist[listpos].bi;
|
| 461 |
p->nc = complist[listpos].nc;
|
| 462 |
p->nr = complist[listpos].nr - p->nc;
|
| 463 |
if (p->nr <= 0)
|
| 464 |
return(0);
|
| 465 |
DCHECK(n < 1 | n > RPACKSIZ,
|
| 466 |
CONSISTENCY, "next_packet called with bad n value");
|
| 467 |
if (p->nr > n)
|
| 468 |
p->nr = n;
|
| 469 |
complist[listpos].nc += p->nr; /* find where this one would go */
|
| 470 |
if (hdgetbeam(hdlist[p->hd], p->bi) != NULL)
|
| 471 |
hdfreefrag(hdlist[p->hd], p->bi);
|
| 472 |
while (lastin > listpos &&
|
| 473 |
beamcmp(complist+lastin, complist+listpos) > 0)
|
| 474 |
lastin--;
|
| 475 |
listpos++;
|
| 476 |
return(1);
|
| 477 |
}
|
