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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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|
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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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/* |
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* Routines for tracking beam compuatations |
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*/ |
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|
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#include "rholo.h" |
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|
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#define abs(x) ((x) > 0 ? (x) : -(x)) |
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#define sgn(x) ((x) > 0 ? 1 : (x) < 0 ? -1 : 0) |
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|
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static PACKHEAD *complist=NULL; /* list of beams to compute */ |
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static int complen=0; /* length of complist */ |
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static int listpos=0; /* current list position for next_packet */ |
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static int lastin= -1; /* last ordered position in list */ |
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|
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|
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int |
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beamcmp(b0, b1) /* comparison for descending compute order */ |
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register PACKHEAD *b0, *b1; |
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{ |
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return( b1->nr*(b0->nc+1) - b0->nr*(b1->nc+1) ); |
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} |
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|
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|
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int |
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dispbeam(b, hp, bi) /* display a holodeck beam */ |
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register BEAM *b; |
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HOLO *hp; |
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int bi; |
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{ |
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static int n = 0; |
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static PACKHEAD *p = NULL; |
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|
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if (b == NULL) |
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return; |
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if (b->nrm > n) { /* (re)allocate packet holder */ |
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n = b->nrm; |
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if (p == NULL) p = (PACKHEAD *)malloc(packsiz(n)); |
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else p = (PACKHEAD *)realloc((char *)p, packsiz(n)); |
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if (p == NULL) |
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error(SYSTEM, "out of memory in dispbeam"); |
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} |
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/* assign packet fields */ |
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bcopy((char *)hdbray(b), (char *)packra(p), b->nrm*sizeof(RAYVAL)); |
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p->nr = p->nc = b->nrm; |
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for (p->hd = 0; hdlist[p->hd] != hp; p->hd++) |
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if (hdlist[p->hd] == NULL) |
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error(CONSISTENCY, "unregistered holodeck in dispbeam"); |
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p->bi = bi; |
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disp_packet(p); /* display it */ |
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} |
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|
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|
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bundle_set(op, clist, nents) /* bundle set operation */ |
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int op; |
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register PACKHEAD *clist; |
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int nents; |
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{ |
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register int i, n; |
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|
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switch (op) { |
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case BS_NEW: /* new computation set */ |
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if (complen) |
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free((char *)complist); |
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if (nents <= 0) { |
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complist = NULL; |
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listpos = complen = 0; |
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lastin = -1; |
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return; |
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} |
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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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bcopy((char *)clist, (char *)complist, nents*sizeof(PACKHEAD)); |
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complen = nents; /* finish initialization below */ |
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break; |
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case BS_ADD: /* add to computation set */ |
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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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/* merge any common members */ |
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for (n = 0; n < nents; n++) { |
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for (i = 0; i < complen; i++) |
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if (clist[n].bi == complist[i].bi && |
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clist[n].hd == complist[i].hd) { |
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int oldnr = complist[i].nr; |
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if (op == BS_ADD) |
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complist[i].nr += clist[n].nr; |
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else /* op == BS_ADJ */ |
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complist[i].nr = clist[n].nr; |
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clist[n].nr = 0; |
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clist[n].nc = complist[i].nc; |
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if (complist[i].nr != oldnr) |
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lastin = -1; /* flag sort */ |
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break; |
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} |
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if (i >= complen) |
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clist[n].nc = bnrays(hdlist[clist[n].hd], |
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clist[n].bi); |
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} |
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/* sort updated list */ |
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sortcomplist(); |
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/* sort new entries */ |
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qsort((char *)clist, nents, sizeof(PACKHEAD), beamcmp); |
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/* what can't we satisfy? */ |
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for (n = 0; n < nents && clist[n].nr > clist[n].nc; n++) |
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; |
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if (op == BS_ADJ) |
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nents = n; |
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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((char *)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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if (nents <= 0) |
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return; |
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/* find each member */ |
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for (i = 0; i < complen; i++) |
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for (n = 0; n < nents; n++) |
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if (clist[n].bi == complist[i].bi && |
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clist[n].hd == complist[i].hd) { |
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if (clist[n].nr == 0 || |
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clist[n].nr >= complist[i].nr) |
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complist[i].nr = 0; |
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else |
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complist[i].nr -= clist[n].nr; |
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lastin = -1; /* flag full sort */ |
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break; |
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} |
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return; /* no display */ |
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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) { /* load and display beams we have */ |
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register HDBEAMI *hb; |
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|
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hb = (HDBEAMI *)malloc(nents*sizeof(HDBEAMI)); |
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for (i = 0; i < nents; i++) { |
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hb[i].h = hdlist[clist[i].hd]; |
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hb[i].b = clist[i].bi; |
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} |
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hdloadbeams(hb, nents, dispbeam); |
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free((char *)hb); |
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} |
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if (op == BS_NEW) { |
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done_packets(flush_queue()); /* empty queue, so we can... */ |
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for (i = 0; i < complen; i++) /* ...get number computed */ |
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complist[i].nc = bnrays(hdlist[complist[i].hd], |
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complist[i].bi); |
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listpos = 0; |
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lastin = -1; /* flag for initial sort */ |
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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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init_global() /* initialize global ray computation */ |
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{ |
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long wtotal = 0; |
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double frac; |
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int i; |
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register int j, k; |
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/* free old list */ |
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if (complen > 0) |
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free((char *)complist); |
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/* allocate beam list */ |
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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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if (complist == NULL) |
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error(SYSTEM, "out of memory in init_global"); |
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/* compute beam weights */ |
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k = 0; |
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for (j = 0; hdlist[j] != NULL; j++) { |
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frac = 512. * hdlist[j]->wg[0] * |
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hdlist[j]->wg[1] * hdlist[j]->wg[2]; |
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if (frac < 0.) frac = -frac; |
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for (i = nbeams(hdlist[j]); i > 0; i--) { |
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complist[k].hd = j; |
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complist[k].bi = i; |
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complist[k].nr = frac*beamvolume(hdlist[j], i) + 0.5; |
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wtotal += complist[k++].nr; |
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} |
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} |
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/* adjust weights */ |
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if (vdef(DISKSPACE)) |
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frac = 1024.*1024.*vflt(DISKSPACE) / (wtotal*sizeof(RAYVAL)); |
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else |
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frac = 1024.*1024.*16384. / (wtotal*sizeof(RAYVAL)); |
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while (k--) |
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complist[k].nr = frac * complist[k].nr; |
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listpos = 0; lastin = -1; /* flag initial sort */ |
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} |
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|
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|
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mergeclists(cdest, cl1, n1, cl2, n2) /* merge two sorted lists */ |
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register PACKHEAD *cdest; |
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register PACKHEAD *cl1, *cl2; |
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int n1, n2; |
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{ |
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register int cmp; |
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|
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while (n1 | n2) { |
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if (!n1) cmp = 1; |
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else if (!n2) cmp = -1; |
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else cmp = beamcmp(cl1, cl2); |
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if (cmp > 0) { |
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copystruct(cdest, cl2); |
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cl2++; n2--; |
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} else { |
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copystruct(cdest, cl1); |
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cl1++; n1--; |
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} |
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cdest++; |
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} |
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} |
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|
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|
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sortcomplist() /* fix our list order */ |
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{ |
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PACKHEAD *list2; |
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register int i; |
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|
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if (complen <= 0) /* check to see if there is even a list */ |
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return; |
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if (lastin < 0 || listpos*4 >= complen*3) |
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qsort((char *)complist, complen, sizeof(PACKHEAD), beamcmp); |
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else if (listpos) { /* else sort and merge sublist */ |
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list2 = (PACKHEAD *)malloc(listpos*sizeof(PACKHEAD)); |
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if (list2 == NULL) |
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error(SYSTEM, "out of memory in sortcomplist"); |
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bcopy((char *)complist,(char *)list2,listpos*sizeof(PACKHEAD)); |
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qsort((char *)list2, listpos, sizeof(PACKHEAD), beamcmp); |
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mergeclists(complist, list2, listpos, |
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complist+listpos, complen-listpos); |
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free((char *)list2); |
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} |
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/* drop satisfied requests */ |
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for (i = complen; i-- && complist[i].nr <= complist[i].nc; ) |
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; |
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if (i < 0) { |
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free((char *)complist); |
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complist = NULL; |
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complen = 0; |
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} else if (i < complen-1) { |
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list2 = (PACKHEAD *)realloc((char *)complist, |
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(i+1)*sizeof(PACKHEAD)); |
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if (list2 != NULL) { |
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complist = list2; |
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complen = i+1; |
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} |
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} |
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listpos = 0; lastin = i; |
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} |
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|
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|
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/* |
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* The following routine works on the assumption that the bundle weights are |
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* more or less evenly distributed, such that computing a packet causes |
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* a given bundle to move way down in the computation order. We keep |
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* track of where the computed bundle with the highest priority would end |
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* up, and if we get further in our compute list than this, we resort the |
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* list and start again from the beginning. Since |
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* a merge sort is used, the sorting costs are minimal. |
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*/ |
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next_packet(p, n) /* prepare packet for computation */ |
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register PACKET *p; |
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int n; |
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{ |
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register int i; |
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|
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if (listpos > lastin) /* time to sort the list */ |
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sortcomplist(); |
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if (complen <= 0) |
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return(0); |
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p->hd = complist[listpos].hd; |
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p->bi = complist[listpos].bi; |
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p->nc = complist[listpos].nc; |
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p->nr = complist[listpos].nr - p->nc; |
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if (p->nr <= 0) |
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return(0); |
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#ifdef DEBUG |
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if (n < 1 | n > RPACKSIZ) |
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error(CONSISTENCY, "next_packet called with bad n value"); |
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#endif |
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if (p->nr > n) |
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p->nr = n; |
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complist[listpos].nc += p->nr; /* find where this one would go */ |
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while (lastin > listpos && |
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beamcmp(complist+lastin, complist+listpos) > 0) |
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lastin--; |
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listpos++; |
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return(1); |
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} |
