| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: rholo3.c,v 3.37 2003/06/20 00:25:49 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Routines for tracking beam compuatations |
| 6 |
*/ |
| 7 |
|
| 8 |
#include <string.h> |
| 9 |
|
| 10 |
#include "rholo.h" |
| 11 |
#include "view.h" |
| 12 |
|
| 13 |
#ifndef NFRAG2CHUNK |
| 14 |
#define NFRAG2CHUNK 4096 /* number of fragments to start chunking */ |
| 15 |
#endif |
| 16 |
|
| 17 |
#ifndef abs |
| 18 |
#define abs(x) ((x) > 0 ? (x) : -(x)) |
| 19 |
#endif |
| 20 |
#ifndef sgn |
| 21 |
#define sgn(x) ((x) > 0 ? 1 : (x) < 0 ? -1 : 0) |
| 22 |
#endif |
| 23 |
|
| 24 |
#define rchunk(n) (((n)+(RPACKSIZ/2))/RPACKSIZ) |
| 25 |
|
| 26 |
extern time_t time(); |
| 27 |
|
| 28 |
int chunkycmp = 0; /* clump beams together on disk */ |
| 29 |
|
| 30 |
static PACKHEAD *complist=NULL; /* list of beams to compute */ |
| 31 |
static int complen=0; /* length of complist */ |
| 32 |
static int listpos=0; /* current list position for next_packet */ |
| 33 |
static int lastin= -1; /* last ordered position in list */ |
| 34 |
|
| 35 |
|
| 36 |
int |
| 37 |
beamcmp(b0, b1) /* comparison for compute order */ |
| 38 |
register PACKHEAD *b0, *b1; |
| 39 |
{ |
| 40 |
BEAMI *bip0, *bip1; |
| 41 |
register long c; |
| 42 |
/* first check desired quantities */ |
| 43 |
if (chunkycmp) |
| 44 |
c = rchunk(b1->nr)*(rchunk(b0->nc)+1L) - |
| 45 |
rchunk(b0->nr)*(rchunk(b1->nc)+1L); |
| 46 |
else |
| 47 |
c = b1->nr*(b0->nc+1L) - b0->nr*(b1->nc+1L); |
| 48 |
if (c > 0) return(1); |
| 49 |
if (c < 0) return(-1); |
| 50 |
/* only one file, so skip the following: */ |
| 51 |
#if 0 |
| 52 |
/* next, check file descriptors */ |
| 53 |
c = hdlist[b0->hd]->fd - hdlist[b1->hd]->fd; |
| 54 |
if (c) return(c); |
| 55 |
#endif |
| 56 |
/* finally, check file positions */ |
| 57 |
bip0 = &hdlist[b0->hd]->bi[b0->bi]; |
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bip1 = &hdlist[b1->hd]->bi[b1->bi]; |
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/* put diskless beams last */ |
| 60 |
if (!bip0->nrd) |
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return(bip1->nrd > 0); |
| 62 |
if (!bip1->nrd) |
| 63 |
return(-1); |
| 64 |
c = bip0->fo - bip1->fo; |
| 65 |
return(c < 0 ? -1 : c > 0); |
| 66 |
} |
| 67 |
|
| 68 |
|
| 69 |
int |
| 70 |
beamidcmp(b0, b1) /* comparison for beam searching */ |
| 71 |
register PACKHEAD *b0, *b1; |
| 72 |
{ |
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register int c = b0->hd - b1->hd; |
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|
| 75 |
if (c) return(c); |
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return(b0->bi - b1->bi); |
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} |
| 78 |
|
| 79 |
|
| 80 |
int |
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dispbeam(b, hb) /* display a holodeck beam */ |
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register BEAM *b; |
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register HDBEAMI *hb; |
| 84 |
{ |
| 85 |
static int n = 0; |
| 86 |
static PACKHEAD *p = NULL; |
| 87 |
|
| 88 |
if (b == NULL) |
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return; |
| 90 |
if (b->nrm > n) { /* (re)allocate packet holder */ |
| 91 |
n = b->nrm; |
| 92 |
if (p == NULL) p = (PACKHEAD *)malloc(packsiz(n)); |
| 93 |
else p = (PACKHEAD *)realloc((void *)p, packsiz(n)); |
| 94 |
CHECK(p==NULL, SYSTEM, "out of memory in dispbeam"); |
| 95 |
} |
| 96 |
/* assign packet fields */ |
| 97 |
memcpy((void *)packra(p), (void *)hdbray(b), b->nrm*sizeof(RAYVAL)); |
| 98 |
p->nr = p->nc = b->nrm; |
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for (p->hd = 0; hdlist[p->hd] != hb->h; p->hd++) |
| 100 |
if (hdlist[p->hd] == NULL) |
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error(CONSISTENCY, "unregistered holodeck in dispbeam"); |
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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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} |
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} |
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|
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|
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bundle_set(op, clist, nents) /* bundle set operation */ |
| 112 |
int op; |
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PACKHEAD *clist; |
| 114 |
int nents; |
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{ |
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int oldnr, n; |
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HDBEAMI *hbarr; |
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register PACKHEAD *csm; |
| 119 |
register int i; |
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/* search for common members */ |
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for (csm = clist+nents; csm-- > clist; ) |
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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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csm = (PACKHEAD *)bsearch((void *)(complist+i), (void *)clist, |
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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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complist = (PACKHEAD *)malloc(nents*sizeof(PACKHEAD)); |
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if (complist == NULL) |
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goto memerr; |
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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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|
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|
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double |
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beamvolume(hp, bi) /* 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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GCOORD gc[2]; |
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FVECT cp[4], edgeA, edgeB, cent[2]; |
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FVECT v, crossp[2], diffv; |
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double vol[2]; |
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register int i; |
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/* get grid coordinates */ |
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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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VSUM(edgeB, cp[3], cp[1], -1.0); |
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fcross(crossp[i], edgeA, edgeB); |
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/* compute center */ |
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cent[i][0] = 0.5*(cp[0][0] + cp[2][0]); |
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cent[i][1] = 0.5*(cp[0][1] + cp[2][1]); |
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cent[i][2] = 0.5*(cp[0][2] + cp[2][2]); |
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} |
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/* compute difference vector */ |
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VSUM(diffv, cent[1], cent[0], -1.0); |
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for (i = 0; i < 2; i++) { /* compute volume contributions */ |
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vol[i] = 0.5*DOT(crossp[i], diffv); |
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if (vol[i] < 0.) vol[i] = -vol[i]; |
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} |
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return(vol[0] + vol[1]); /* return total volume */ |
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} |
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|
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|
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ambient_list() /* compute ambient beam list */ |
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{ |
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int32 wtotal, minrt; |
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double frac; |
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int i; |
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register int j, k; |
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|
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complen = 0; |
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for (j = 0; hdlist[j] != NULL; j++) |
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complen += nbeams(hdlist[j]); |
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complist = (PACKHEAD *)malloc(complen*sizeof(PACKHEAD)); |
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CHECK(complist==NULL, SYSTEM, "out of memory in ambient_list"); |
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/* compute beam weights */ |
| 276 |
k = 0; wtotal = 0; |
| 277 |
for (j = 0; hdlist[j] != NULL; j++) { |
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frac = 512. * VLEN(hdlist[j]->wg[0]) * |
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VLEN(hdlist[j]->wg[1]) * |
| 280 |
VLEN(hdlist[j]->wg[2]); |
| 281 |
for (i = nbeams(hdlist[j]); i > 0; i--) { |
| 282 |
complist[k].hd = j; |
| 283 |
complist[k].bi = i; |
| 284 |
complist[k].nr = frac*beamvolume(hdlist[j], i) + 0.5; |
| 285 |
complist[k].nc = bnrays(hdlist[j], i); |
| 286 |
wtotal += complist[k++].nr; |
| 287 |
} |
| 288 |
} |
| 289 |
/* adjust sample weights */ |
| 290 |
if (vdef(DISKSPACE)) |
| 291 |
frac = 1024.*1024.*vflt(DISKSPACE) / (wtotal*sizeof(RAYVAL)); |
| 292 |
else |
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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 |
listpos = 0; lastin = -1; /* flag initial sort */ |
| 301 |
} |
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|
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|
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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 |
|
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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 |
free((void *)blist.bl); |
| 324 |
} |
| 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 |
free((void *)complist); |
| 334 |
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 |
/* no view vicinity */ |
| 344 |
myeye.rng = 0; |
| 345 |
} |
| 346 |
|
| 347 |
|
| 348 |
mergeclists(cdest, cl1, n1, cl2, n2) /* merge two sorted lists */ |
| 349 |
register PACKHEAD *cdest; |
| 350 |
register PACKHEAD *cl1, *cl2; |
| 351 |
int n1, n2; |
| 352 |
{ |
| 353 |
register int cmp; |
| 354 |
|
| 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 |
int listlen; |
| 375 |
register int i; |
| 376 |
|
| 377 |
if (complen <= 0) /* check to see if there is even a list */ |
| 378 |
return; |
| 379 |
if (!chunkycmp) /* check to see if fragment list is full */ |
| 380 |
if (!hdfragOK(hdlist[0]->fd, &listlen, NULL) |
| 381 |
#if NFRAG2CHUNK |
| 382 |
|| listlen >= NFRAG2CHUNK |
| 383 |
#endif |
| 384 |
) { |
| 385 |
chunkycmp++; /* use "chunky" comparison */ |
| 386 |
lastin = -1; /* need to re-sort list */ |
| 387 |
#ifdef DEBUG |
| 388 |
error(WARNING, "using chunky comparison mode"); |
| 389 |
#endif |
| 390 |
} |
| 391 |
if (lastin < 0 || listpos*4 >= complen*3) |
| 392 |
qsort((void *)complist, complen, sizeof(PACKHEAD), beamcmp); |
| 393 |
else if (listpos) { /* else sort and merge sublist */ |
| 394 |
list2 = (PACKHEAD *)malloc(listpos*sizeof(PACKHEAD)); |
| 395 |
CHECK(list2==NULL, SYSTEM, "out of memory in sortcomplist"); |
| 396 |
memcpy((void *)list2,(void *)complist,listpos*sizeof(PACKHEAD)); |
| 397 |
qsort((void *)list2, listpos, sizeof(PACKHEAD), beamcmp); |
| 398 |
mergeclists(complist, list2, listpos, |
| 399 |
complist+listpos, complen-listpos); |
| 400 |
free((void *)list2); |
| 401 |
} |
| 402 |
/* drop satisfied requests */ |
| 403 |
for (i = complen; i-- && complist[i].nr <= complist[i].nc; ) |
| 404 |
; |
| 405 |
if (i < 0) { |
| 406 |
free((void *)complist); |
| 407 |
complist = NULL; |
| 408 |
complen = 0; |
| 409 |
} else if (i < complen-1) { |
| 410 |
list2 = (PACKHEAD *)realloc((void *)complist, |
| 411 |
(i+1)*sizeof(PACKHEAD)); |
| 412 |
if (list2 != NULL) |
| 413 |
complist = list2; |
| 414 |
complen = i+1; |
| 415 |
} |
| 416 |
listpos = 0; lastin = i; |
| 417 |
} |
| 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 |
* up, and if we get further in our compute list than this, we re-sort the |
| 426 |
* list and start again from the beginning. Since |
| 427 |
* a merge sort is used, the sorting costs are minimal. |
| 428 |
*/ |
| 429 |
next_packet(p, n) /* prepare packet for computation */ |
| 430 |
register PACKET *p; |
| 431 |
int n; |
| 432 |
{ |
| 433 |
register int i; |
| 434 |
|
| 435 |
if (listpos > lastin) /* time to sort the list */ |
| 436 |
sortcomplist(); |
| 437 |
if (complen <= 0) |
| 438 |
return(0); |
| 439 |
p->hd = complist[listpos].hd; |
| 440 |
p->bi = complist[listpos].bi; |
| 441 |
p->nc = complist[listpos].nc; |
| 442 |
p->nr = complist[listpos].nr - p->nc; |
| 443 |
if (p->nr <= 0) |
| 444 |
return(0); |
| 445 |
DCHECK(n < 1 | n > RPACKSIZ, |
| 446 |
CONSISTENCY, "next_packet called with bad n value"); |
| 447 |
if (p->nr > n) |
| 448 |
p->nr = n; |
| 449 |
complist[listpos].nc += p->nr; /* find where this one would go */ |
| 450 |
if (hdgetbeam(hdlist[p->hd], p->bi) != NULL) |
| 451 |
hdfreefrag(hdlist[p->hd], p->bi); |
| 452 |
while (lastin > listpos && |
| 453 |
beamcmp(complist+lastin, complist+listpos) > 0) |
| 454 |
lastin--; |
| 455 |
listpos++; |
| 456 |
return(1); |
| 457 |
} |
