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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* Holodeck beam tracking for display process |
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*/ |
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#include "rholo.h" |
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#include "rhdisp.h" |
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#include "rhdriver.h" |
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#include "random.h" |
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|
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#ifndef MAXDIST |
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#define MAXDIST 42 /* maximum distance outside section */ |
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#endif |
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#ifndef NVSAMPS |
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#define NVSAMPS 4096 /* number of ray samples per view */ |
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#endif |
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#ifndef MEYERNG |
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#define MEYERNG 0.2 /* target mean eye range (rel. to grid) */ |
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#endif |
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#ifndef MAXTODO |
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#define MAXTODO 3 /* maximum sections to look at */ |
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#endif |
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#ifndef MAXDRAT |
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#define MAXDRAT 3.0 /* maximum distance ratio btwn. cand. sect. */ |
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#endif |
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|
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#define CBEAMBLK 1024 /* cbeam allocation block size */ |
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|
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static struct beamcomp { |
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int hd; /* holodeck section number */ |
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int bi; /* beam index */ |
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int4 nr; /* number of samples desired */ |
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} *cbeam = NULL; /* current beam list */ |
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|
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VIEWPOINT cureye; /* current eye position */ |
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|
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static PACKHEAD *cbeam = NULL; /* current beam list */ |
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static int ncbeams = 0; /* number of sorted beams in cbeam */ |
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static int xcbeams = 0; /* extra (unregistered) beams past ncbeams */ |
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static int maxcbeam = 0; /* size of cbeam array */ |
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|
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VIEWPOINT cureye; /* current eye position */ |
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|
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|
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int |
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newcbeam() /* allocate new entry at end of cbeam array */ |
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{ |
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if ((i = ncbeams + xcbeams++) >= maxcbeam) { /* grow array */ |
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maxcbeam += CBEAMBLK; |
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if (cbeam == NULL) |
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cbeam = (struct beamcomp *)malloc( |
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maxcbeam*sizeof(struct beamcomp) ); |
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cbeam = (PACKHEAD *)malloc( |
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maxcbeam*sizeof(PACKHEAD) ); |
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else |
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cbeam = (struct beamcomp *)realloc( (char *)cbeam, |
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maxcbeam*sizeof(struct beamcomp) ); |
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cbeam = (PACKHEAD *)realloc((void *)cbeam, |
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maxcbeam*sizeof(PACKHEAD) ); |
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if (cbeam == NULL) |
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error(SYSTEM, "out of memory in newcbeam"); |
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} |
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|
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int |
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cbeamcmp(cb1, cb2) /* compare two cbeam entries for sort: keep orphans */ |
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register struct beamcomp *cb1, *cb2; |
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register PACKHEAD *cb1, *cb2; |
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{ |
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register int c; |
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|
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|
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int |
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cbeamcmp2(cb1, cb2) /* compare two cbeam entries for sort: no orphans */ |
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register struct beamcomp *cb1, *cb2; |
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register PACKHEAD *cb1, *cb2; |
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{ |
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register int c; |
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|
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findcbeam(hd, bi) /* find the specified beam in our sorted list */ |
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int hd, bi; |
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{ |
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struct beamcomp cb; |
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register struct beamcomp *p; |
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PACKHEAD cb; |
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register PACKHEAD *p; |
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|
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if (ncbeams <= 0) |
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return(-1); |
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cb.hd = hd; cb.bi = bi; cb.nr = 0; |
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p = (struct beamcomp *)bsearch((char *)&cb, (char *)cbeam, ncbeams, |
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sizeof(struct beamcomp), cbeamcmp); |
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cb.hd = hd; cb.bi = bi; cb.nr = cb.nc = 0; |
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p = (PACKHEAD *)bsearch((char *)&cb, (char *)cbeam, ncbeams, |
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sizeof(PACKHEAD), cbeamcmp); |
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if (p == NULL) |
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return(-1); |
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return(p - cbeam); |
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if (cbeam[n].bi == bi && cbeam[n].hd == hd) |
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return(n); |
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/* check legality */ |
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if (hd < 0 | hd >= HDMAX || hdlist[hd] == NULL) |
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if ((hd < 0) | (hd >= HDMAX) || hdlist[hd] == NULL) |
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error(INTERNAL, "illegal holodeck number in getcbeam"); |
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if (bi < 1 | bi > nbeams(hdlist[hd])) |
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if ((bi < 1) | (bi > nbeams(hdlist[hd]))) |
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error(INTERNAL, "illegal beam index in getcbeam"); |
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n = newcbeam(); /* allocate and assign */ |
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cbeam[n].nr = 0; cbeam[n].hd = hd; cbeam[n].bi = bi; |
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cbeam[n].hd = hd; cbeam[n].bi = bi; cbeam[n].nr = cbeam[n].nc = 0; |
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return(n); |
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} |
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if (!(ncbeams += xcbeams)) |
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return; |
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xcbeams = 0; |
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qsort((char *)cbeam, ncbeams, sizeof(struct beamcomp), |
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qsort((char *)cbeam, ncbeams, sizeof(PACKHEAD), |
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adopt ? cbeamcmp : cbeamcmp2); |
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if (adopt) |
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return; |
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} |
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cbeamop(op, bl, n) /* update beams on server list */ |
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int op; |
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register struct beamcomp *bl; |
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int n; |
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{ |
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register PACKHEAD *pa; |
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register int i; |
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|
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if (n <= 0) |
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return; |
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pa = (PACKHEAD *)malloc(n*sizeof(PACKHEAD)); |
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if (pa == NULL) |
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error(SYSTEM, "out of memory in cbeamop"); |
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for (i = 0; i < n; i++) { |
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pa[i].hd = bl[i].hd; |
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pa[i].bi = bl[i].bi; |
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pa[i].nr = bl[i].nr; |
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pa[i].nc = 0; |
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} |
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serv_request(op, n*sizeof(PACKHEAD), (char *)pa); |
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free((char *)pa); |
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} |
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|
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|
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int |
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comptodo(tdl, vw) /* compute holodeck sections in view */ |
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int tdl[MAXTODO+1]; |
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VIEW *vw; |
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{ |
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int n = 0; |
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FVECT gp, dv; |
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double dist2[MAXTODO+1], thisdist2; |
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register int i, j; |
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/* find closest MAXTODO sections */ |
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for (i = 0; hdlist[i]; i++) { |
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hdgrid(gp, hdlist[i], vw->vp); |
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for (j = 0; j < 3; j++) |
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if (gp[j] < 0.) |
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dv[j] = -gp[j]; |
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else if (gp[j] > hdlist[i]->grid[j]) |
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dv[j] = gp[j] - hdlist[i]->grid[j]; |
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else |
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dv[j] = 0.; |
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thisdist2 = DOT(dv,dv); |
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for (j = n; j > 0 && thisdist2 < dist2[j-1]; j--) { |
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tdl[j] = tdl[j-1]; |
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dist2[j] = dist2[j-1]; |
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} |
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tdl[j] = i; |
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dist2[j] = thisdist2; |
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if (n < MAXTODO) |
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n++; |
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} |
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/* watch for bad move */ |
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if (n && dist2[0] > MAXDIST*MAXDIST) { |
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error(COMMAND, "move past outer limits"); |
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return(0); |
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} |
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/* avoid big differences */ |
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for (j = 1; j < n; j++) |
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if (dist2[j] > MAXDRAT*MAXDRAT*dist2[j-1]) |
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n = j; |
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tdl[n] = -1; |
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return(n); |
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} |
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|
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|
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addview(hd, vw, hres, vres) /* add view for section */ |
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int hd; |
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VIEW *vw; |
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int hres, vres; |
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{ |
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int sampquant; |
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int h, v, shr, svr; |
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GCOORD gc[2]; |
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FVECT rorg, rdir; |
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/* compute sampling grid */ |
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if (hres|vres && hres*vres <= NVSAMPS) { |
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shr = hres; svr = vres; |
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sampquant = 1; |
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} else { |
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shr = sqrt(NVSAMPS/viewaspect(vw)) + .5; |
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svr = (NVSAMPS + shr/2)/shr; |
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sampquant = (hres*vres + shr*svr/2)/(shr*svr); |
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} |
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/* intersect sample rays with section */ |
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for (v = svr; v--; ) |
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for (h = shr; h--; ) { |
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if (viewray(rorg, rdir, vw, (v+frandom())/svr, |
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(h+frandom())/shr) < -FTINY) |
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continue; |
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if (hdinter(gc, NULL, NULL, hdlist[hd], rorg, rdir) |
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>= FHUGE) |
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continue; |
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cbeam[getcbeam(hd,hdbindex(hdlist[hd],gc))].nr += |
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sampquant; |
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} |
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} |
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|
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|
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beam_init(fresh) /* clear beam list for new view(s) */ |
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int fresh; |
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{ |
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} |
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int16 * |
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beam_view(vn, hr, vr) /* add beam view (if advisable) */ |
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VIEW *vn; |
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int hr, vr; |
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{ |
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int todo[MAXTODO+1], n; |
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double hdgsiz, d; |
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int16 *slist; |
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BEAMLIST blist; |
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double eravg, d; |
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register HOLO *hp; |
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register int i; |
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/* sort our list */ |
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> |
register int i, n; |
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/* compute beams for view */ |
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> |
slist = viewbeams(vn, hr, vr, &blist); |
162 |
> |
if (*slist < 0) { |
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> |
error(COMMAND, "no sections visible from this view"); |
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> |
return(NULL); |
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> |
} |
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/* sort current beam list */ |
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cbeamsort(1); |
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< |
/* add view to nearby sections */ |
169 |
< |
if (!(n = comptodo(todo, vn))) |
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return(0); |
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< |
for (i = 0; i < n; i++) |
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< |
addview(todo[i], vn, hr, vr); |
286 |
< |
if (MEYERNG <= FTINY || vn->type == VT_PAR) |
287 |
< |
return(1); |
288 |
< |
hdgsiz = 0.; /* compute mean grid size */ |
289 |
< |
for (i = 0; i < n; i++) { |
290 |
< |
hp = hdlist[todo[i]]; |
291 |
< |
hdgsiz += 1./3. / VLEN(hp->wg[0]) + |
292 |
< |
1./3. / VLEN(hp->wg[1]) + |
293 |
< |
1./3. / VLEN(hp->wg[2]) ; |
168 |
> |
/* add new beams to list */ |
169 |
> |
for (i = blist.nb; i--; ) { |
170 |
> |
n = getcbeam(blist.bl[i].hd, blist.bl[i].bi); |
171 |
> |
if (blist.bl[i].nr > cbeam[n].nr) |
172 |
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cbeam[n].nr = blist.bl[i].nr; |
173 |
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} |
174 |
< |
hdgsiz /= (double)n; |
174 |
> |
free((void *)blist.bl); /* free list */ |
175 |
> |
if (MEYERNG <= FTINY) |
176 |
> |
return(slist); |
177 |
> |
/* compute average eye range */ |
178 |
> |
eravg = 0.; |
179 |
> |
for (n = 0; slist[n] >= 0; n++) { |
180 |
> |
hp = hdlist[slist[n]]; |
181 |
> |
eravg += MEYERNG/3. / VLEN(hp->wg[0]) + |
182 |
> |
MEYERNG/3. / VLEN(hp->wg[1]) + |
183 |
> |
MEYERNG/3. / VLEN(hp->wg[2]) ; |
184 |
> |
} |
185 |
> |
eravg /= (double)n; |
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/* add to current eye position */ |
187 |
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if (cureye.rng <= FTINY) { |
188 |
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VCOPY(cureye.vpt, vn->vp); |
189 |
< |
cureye.rng = MEYERNG * hdgsiz; |
190 |
< |
} else if ((d = sqrt(dist2(vn->vp,cureye.vpt))) + MEYERNG*hdgsiz > |
301 |
< |
cureye.rng) { |
189 |
> |
cureye.rng = eravg; |
190 |
> |
} else if ((d = sqrt(dist2(vn->vp,cureye.vpt))) + eravg > cureye.rng) { |
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for (i = 3; i--; ) |
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cureye.vpt[i] = 0.5*(cureye.vpt[i] + vn->vp[i]); |
193 |
< |
cureye.rng = 0.5*(cureye.rng + MEYERNG*hdgsiz + d); |
193 |
> |
cureye.rng = 0.5*(cureye.rng + eravg + d); |
194 |
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} |
195 |
< |
return(1); |
195 |
> |
return(slist); |
196 |
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} |
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|
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|
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/* sort list (put orphans at end) */ |
206 |
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cbeamsort(all < 0); |
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/* send beam request */ |
208 |
< |
if (all) |
209 |
< |
cbeamop(DR_NEWSET, cbeam, ncbeams); |
210 |
< |
else |
211 |
< |
cbeamop(DR_ADJSET, cbeam, ncbeams+xcbeams); |
208 |
> |
if (all) { |
209 |
> |
if (ncbeams > 0) |
210 |
> |
serv_request(DR_NEWSET, |
211 |
> |
ncbeams*sizeof(PACKHEAD), cbeam); |
212 |
> |
} else { |
213 |
> |
if (ncbeams+xcbeams > 0) |
214 |
> |
serv_request(DR_ADJSET, |
215 |
> |
(ncbeams+xcbeams)*sizeof(PACKHEAD), cbeam); |
216 |
> |
} |
217 |
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xcbeams = 0; /* truncate our list */ |
218 |
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return(ncbeams); |
219 |
+ |
} |
220 |
+ |
|
221 |
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|
222 |
+ |
gridlines(f) /* run through holodeck section grid lines */ |
223 |
+ |
int (*f)(); |
224 |
+ |
{ |
225 |
+ |
register int hd, w, i; |
226 |
+ |
int g0, g1; |
227 |
+ |
FVECT wp[2], mov; |
228 |
+ |
double d; |
229 |
+ |
/* do each wall on each section */ |
230 |
+ |
for (hd = 0; hdlist[hd] != NULL; hd++) |
231 |
+ |
for (w = 0; w < 6; w++) { |
232 |
+ |
g0 = hdwg0[w]; |
233 |
+ |
g1 = hdwg1[w]; |
234 |
+ |
d = 1.0/hdlist[hd]->grid[g0]; |
235 |
+ |
mov[0] = d * hdlist[hd]->xv[g0][0]; |
236 |
+ |
mov[1] = d * hdlist[hd]->xv[g0][1]; |
237 |
+ |
mov[2] = d * hdlist[hd]->xv[g0][2]; |
238 |
+ |
if (w & 1) { |
239 |
+ |
VSUM(wp[0], hdlist[hd]->orig, |
240 |
+ |
hdlist[hd]->xv[w>>1], 1.); |
241 |
+ |
VSUM(wp[0], wp[0], mov, 1.); |
242 |
+ |
} else |
243 |
+ |
VCOPY(wp[0], hdlist[hd]->orig); |
244 |
+ |
VSUM(wp[1], wp[0], hdlist[hd]->xv[g1], 1.); |
245 |
+ |
for (i = hdlist[hd]->grid[g0]; ; ) { /* g0 lines */ |
246 |
+ |
(*f)(wp); |
247 |
+ |
if (!--i) break; |
248 |
+ |
wp[0][0] += mov[0]; wp[0][1] += mov[1]; |
249 |
+ |
wp[0][2] += mov[2]; wp[1][0] += mov[0]; |
250 |
+ |
wp[1][1] += mov[1]; wp[1][2] += mov[2]; |
251 |
+ |
} |
252 |
+ |
d = 1.0/hdlist[hd]->grid[g1]; |
253 |
+ |
mov[0] = d * hdlist[hd]->xv[g1][0]; |
254 |
+ |
mov[1] = d * hdlist[hd]->xv[g1][1]; |
255 |
+ |
mov[2] = d * hdlist[hd]->xv[g1][2]; |
256 |
+ |
if (w & 1) |
257 |
+ |
VSUM(wp[0], hdlist[hd]->orig, |
258 |
+ |
hdlist[hd]->xv[w>>1], 1.); |
259 |
+ |
else |
260 |
+ |
VSUM(wp[0], hdlist[hd]->orig, mov, 1.); |
261 |
+ |
VSUM(wp[1], wp[0], hdlist[hd]->xv[g0], 1.); |
262 |
+ |
for (i = hdlist[hd]->grid[g1]; ; ) { /* g1 lines */ |
263 |
+ |
(*f)(wp); |
264 |
+ |
if (!--i) break; |
265 |
+ |
wp[0][0] += mov[0]; wp[0][1] += mov[1]; |
266 |
+ |
wp[0][2] += mov[2]; wp[1][0] += mov[0]; |
267 |
+ |
wp[1][1] += mov[1]; wp[1][2] += mov[2]; |
268 |
+ |
} |
269 |
+ |
} |
270 |
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} |