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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 "rhdisp.h" |
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#include "rhdriver.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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#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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|
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#define MAXVOXEL 16 /* maximum number of active voxels */ |
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|
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typedef struct { |
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int hd; /* holodeck section number (-1 if inactive) */ |
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int i[3]; /* voxel index (may be outside section) */ |
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} VOXL; /* a voxel */ |
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|
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static VOXL voxel[MAXVOXEL] = {{-1}}; /* current voxel list */ |
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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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unsigned int2 wants; /* flags telling which voxels want us */ |
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unsigned int2 hd; /* holodeck section number */ |
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int4 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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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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struct cellact { |
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short vi; /* voxel index */ |
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short add; /* zero means delete */ |
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short rev; /* reverse ray direction? */ |
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VIEW *vp; /* view for image */ |
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short hr, vr; /* image resolution */ |
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}; /* action for cell */ |
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VIEWPOINT cureye; /* current eye position */ |
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struct beamact { |
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struct cellact ca; /* cell action */ |
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GCOORD gc; /* grid coordinate */ |
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}; /* beam origin and action */ |
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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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if (!cb1->wants) /* put orphans at the end, unsorted */ |
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return(cb2->wants); |
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if (!cb2->wants) |
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if (!cb1->nr) /* put orphans at the end, unsorted */ |
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return(cb2->nr); |
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if (!cb2->nr) |
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return(-1); |
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if ((c = cb1->bi - cb2->bi)) /* sort on beam index first */ |
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return(c); |
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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.wants = 0; 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].wants = 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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|
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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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for (i = ncbeams; i--; ) /* identify orphans */ |
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if (cbeam[i].wants) |
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if (cbeam[i].nr) |
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break; |
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xcbeams = ncbeams - ++i; /* put orphans after ncbeams */ |
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ncbeams = i; |
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} |
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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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beam_init(fresh) /* clear beam list for new view(s) */ |
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int fresh; |
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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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add_voxels(vp) /* add voxels corresponding to view point */ |
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FVECT vp; |
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{ |
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int first, n, rfl = 0; |
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FVECT gp; |
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double d; |
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int dist, bestd = 0x7fff; |
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VOXL vox; |
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register int i, j, k; |
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/* count voxels in list already */ |
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for (first = 0; first < MAXVOXEL && voxel[first].hd >= 0; first++) |
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; |
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/* find closest voxels */ |
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for (n = first, i = 0; n < MAXVOXEL && hdlist[i]; i++) { |
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hdgrid(gp, hdlist[i], vp); |
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for (j = 0; n < MAXVOXEL && j < 8; j++) { |
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dist = 0; |
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for (k = 0; k < 3; k++) { |
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d = gp[k] - .5 + (j>>k & 1); |
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if (d < 0.) |
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dist += -(vox.i[k] = (int)d - 1); |
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else if ((vox.i[k] = d) >= hdlist[i]->grid[k]) |
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dist += vox.i[k] - |
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hdlist[i]->grid[k] + 1; |
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} |
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if (dist > bestd) /* others were closer */ |
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continue; |
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if (dist < bestd) { /* start closer list */ |
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n = first; |
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bestd = dist; |
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rfl = 0; |
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} |
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/* check if already in list */ |
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for (k = first; k--; ) |
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if (voxel[k].hd == i && |
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voxel[k].i[0] == vox.i[0] && |
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voxel[k].i[1] == vox.i[1] && |
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voxel[k].i[2] == vox.i[2]) |
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break; |
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if (k >= 0) { |
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rfl |= 1<<k; |
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continue; |
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} |
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vox.hd = i; /* add this voxel */ |
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copystruct(&voxel[n], &vox); |
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rfl |= 1<<n++; |
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} |
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} |
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/* check for really stupid move */ |
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if (bestd > 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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if (n < MAXVOXEL) |
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< |
voxel[n].hd = -1; |
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return(rfl); |
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} |
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|
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|
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int |
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dobeam(gcp, bp) /* express interest or disintrest in a beam */ |
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GCOORD *gcp; |
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register struct beamact *bp; |
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{ |
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GCOORD gc[2]; |
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int bi, i, n; |
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/* compute beam index */ |
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< |
if (bp->ca.rev) { |
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< |
copystruct(gc, &bp->gc); |
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< |
copystruct(gc+1, gcp); |
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} else { |
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< |
copystruct(gc, gcp); |
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< |
copystruct(gc+1, &bp->gc); |
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} |
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< |
if ((bi = hdbindex(hdlist[voxel[bp->ca.vi].hd], gc)) <= 0) |
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error(CONSISTENCY, "bad grid coordinate in dobeam"); |
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if (bp->ca.add) { /* add it in */ |
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i = getcbeam(voxel[bp->ca.vi].hd, bi); |
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cbeam[i].wants |= 1<<bp->ca.vi; /* say we want it */ |
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< |
n = npixels(bp->ca.vp, bp->ca.hr, bp->ca.vr, |
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hdlist[cbeam[i].hd], cbeam[i].bi); |
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< |
if (n > cbeam[i].nr) |
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< |
cbeam[i].nr = n; |
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return(i == ncbeams+xcbeams-1); /* return 1 if totally new */ |
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} |
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/* else delete it */ |
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i = findcbeam(voxel[bp->ca.vi].hd, bi); |
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< |
if (i >= 0 && cbeam[i].wants & 1<<bp->ca.vi) { |
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< |
cbeam[i].wants &= ~(1<<bp->ca.vi); /* we don't want it */ |
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< |
if (!cbeam[i].wants) |
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if (fresh) /* discard old beams? */ |
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ncbeams = xcbeams = 0; |
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else /* else clear sample requests */ |
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for (i = ncbeams+xcbeams; i--; ) |
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cbeam[i].nr = 0; |
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< |
return(1); /* indicate change */ |
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} |
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return(0); |
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cureye.rng = 0.; |
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} |
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|
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|
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< |
|
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int |
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docell(gcp, cap) /* find beams corresponding to cell and voxel */ |
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< |
GCOORD *gcp; |
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< |
register struct cellact *cap; |
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< |
{ |
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< |
register HOLO *hp = hdlist[voxel[cap->vi].hd]; |
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< |
FVECT org, dir[4]; |
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< |
FVECT vgp, cgp, vc; |
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< |
FVECT v1, v2; |
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< |
struct beamact bo; |
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< |
int axmax, j; |
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< |
double d, avmax; |
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< |
register int i; |
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< |
/* compute cell center */ |
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< |
cgp[gcp->w>>1] = gcp->w&1 ? hp->grid[gcp->w>>1] : 0 ; |
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< |
cgp[hdwg0[gcp->w]] = gcp->i[0] + .5; |
| 303 |
< |
cgp[hdwg1[gcp->w]] = gcp->i[1] + .5; |
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< |
hdworld(org, hp, cgp); |
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< |
/* compute direction to voxel center */ |
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< |
for (i = 3; i--; ) |
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< |
vgp[i] = voxel[cap->vi].i[i] + .5; |
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< |
hdworld(vc, hp, vgp); |
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< |
for (i = 3; i--; ) |
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< |
vc[i] -= org[i]; |
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< |
/* compute maximum area axis */ |
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< |
axmax = -1; avmax = 0; |
| 313 |
< |
for (i = 3; i--; ) { |
| 314 |
< |
d = vgp[i] - cgp[i]; |
| 315 |
< |
if (d < 0.) d = -d; |
| 316 |
< |
if (d > avmax) { |
| 317 |
< |
avmax = d; |
| 318 |
< |
axmax = i; |
| 319 |
< |
} |
| 320 |
< |
} |
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< |
#ifdef DEBUG |
| 322 |
< |
if (axmax < 0.) |
| 323 |
< |
error(CONSISTENCY, "botched axis computation in docell"); |
| 324 |
< |
#endif |
| 325 |
< |
/* compute offset vectors */ |
| 326 |
< |
d = 0.5/hp->grid[j=(axmax+1)%3]; |
| 327 |
< |
for (i = 3; i--; ) |
| 328 |
< |
v1[i] = hp->xv[j][i] * d; |
| 329 |
< |
d = 0.5/hp->grid[j=(axmax+2)%3]; |
| 330 |
< |
if (DOT(hp->wg[axmax], vc) < 0.) |
| 331 |
< |
d = -d; /* reverse vertex order */ |
| 332 |
< |
for (i = 3; i--; ) |
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< |
v2[i] = hp->xv[j][i] * d; |
| 334 |
< |
/* compute voxel pyramid */ |
| 335 |
< |
for (i = 3; i--; ) { |
| 336 |
< |
dir[0][i] = vc[i] - v1[i] - v2[i]; |
| 337 |
< |
dir[1][i] = vc[i] + v1[i] - v2[i]; |
| 338 |
< |
dir[2][i] = vc[i] + v1[i] + v2[i]; |
| 339 |
< |
dir[3][i] = vc[i] - v1[i] + v2[i]; |
| 340 |
< |
} |
| 341 |
< |
/* visit beams for opposite cells */ |
| 342 |
< |
copystruct(&bo.ca, cap); |
| 343 |
< |
copystruct(&bo.gc, gcp); |
| 344 |
< |
return(visit_cells(org, dir, hp, dobeam, &bo)); |
| 345 |
< |
} |
| 346 |
< |
|
| 347 |
< |
|
| 348 |
< |
int |
| 349 |
< |
doview(cap) /* visit cells for a given view */ |
| 350 |
< |
struct cellact *cap; |
| 351 |
< |
{ |
| 352 |
< |
int orient; |
| 353 |
< |
FVECT org, dir[4]; |
| 354 |
< |
/* compute view pyramid */ |
| 355 |
< |
orient = viewpyramid(org, dir, hdlist[voxel[cap->vi].hd], cap->vp); |
| 356 |
< |
if (!orient) |
| 357 |
< |
error(INTERNAL, "unusable view in doview"); |
| 358 |
< |
cap->rev = orient < 0; |
| 359 |
< |
/* visit cells within pyramid */ |
| 360 |
< |
return(visit_cells(org, dir, hdlist[voxel[cap->vi].hd], docell, cap)); |
| 361 |
< |
} |
| 362 |
< |
|
| 363 |
< |
|
| 364 |
< |
beam_init() /* clear beam list for new view(s) */ |
| 365 |
< |
{ |
| 366 |
< |
register int i; |
| 367 |
< |
/* clear desire flags */ |
| 368 |
< |
for (i = ncbeams+xcbeams; i--; ) |
| 369 |
< |
cbeam[i].wants = cbeam[i].nr = 0; |
| 370 |
< |
voxel[0].hd = -1; /* clear voxel list */ |
| 371 |
< |
} |
| 372 |
< |
|
| 373 |
< |
|
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> |
int16 * |
| 151 |
|
beam_view(vn, hr, vr) /* add beam view (if advisable) */ |
| 152 |
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VIEW *vn; |
| 153 |
|
int hr, vr; |
| 154 |
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{ |
| 155 |
< |
struct cellact ca; |
| 156 |
< |
int vfl; |
| 157 |
< |
/* sort our list */ |
| 155 |
> |
int16 *slist; |
| 156 |
> |
BEAMLIST blist; |
| 157 |
> |
double eravg, d; |
| 158 |
> |
register HOLO *hp; |
| 159 |
> |
register int i, n; |
| 160 |
> |
/* compute beams for view */ |
| 161 |
> |
slist = viewbeams(vn, hr, vr, &blist); |
| 162 |
> |
if (*slist < 0) { |
| 163 |
> |
error(COMMAND, "no sections visible from this view"); |
| 164 |
> |
return(NULL); |
| 165 |
> |
} |
| 166 |
> |
/* sort current beam list */ |
| 167 |
|
cbeamsort(1); |
| 168 |
< |
/* add new voxels */ |
| 169 |
< |
vfl = add_voxels(vn->vp); |
| 170 |
< |
if (!vfl) |
| 171 |
< |
return(0); |
| 172 |
< |
ca.vp = vn; ca.hr = hr; ca.vr = vr; |
| 173 |
< |
ca.add = 1; /* update our beam list */ |
| 174 |
< |
for (ca.vi = 0; vfl; vfl >>= 1, ca.vi++) |
| 175 |
< |
if (vfl & 1) |
| 176 |
< |
doview(&ca); |
| 177 |
< |
return(1); |
| 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 |
> |
cbeam[n].nr = blist.bl[i].nr; |
| 173 |
> |
} |
| 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; |
| 186 |
> |
/* add to current eye position */ |
| 187 |
> |
if (cureye.rng <= FTINY) { |
| 188 |
> |
VCOPY(cureye.vpt, vn->vp); |
| 189 |
> |
cureye.rng = eravg; |
| 190 |
> |
} else if ((d = sqrt(dist2(vn->vp,cureye.vpt))) + eravg > cureye.rng) { |
| 191 |
> |
for (i = 3; i--; ) |
| 192 |
> |
cureye.vpt[i] = 0.5*(cureye.vpt[i] + vn->vp[i]); |
| 193 |
> |
cureye.rng = 0.5*(cureye.rng + eravg + d); |
| 194 |
> |
} |
| 195 |
> |
return(slist); |
| 196 |
|
} |
| 197 |
|
|
| 198 |
|
|
| 200 |
|
beam_sync(all) /* update beam list on server */ |
| 201 |
|
int all; |
| 202 |
|
{ |
| 203 |
< |
/* sort list to put orphans at end */ |
| 204 |
< |
cbeamsort(0); |
| 205 |
< |
if (all) |
| 206 |
< |
cbeamop(DR_NEWSET, cbeam, ncbeams); |
| 207 |
< |
else |
| 208 |
< |
cbeamop(DR_ADJSET, cbeam, ncbeams+xcbeams); |
| 203 |
> |
/* set new eye position */ |
| 204 |
> |
serv_request(DR_VIEWPOINT, sizeof(VIEWPOINT), (char *)&cureye); |
| 205 |
> |
/* sort list (put orphans at end) */ |
| 206 |
> |
cbeamsort(all < 0); |
| 207 |
> |
/* send beam request */ |
| 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 |
|
xcbeams = 0; /* truncate our list */ |
| 218 |
|
return(ncbeams); |
| 219 |
+ |
} |
| 220 |
+ |
|
| 221 |
+ |
|
| 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 |
|
} |
