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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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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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#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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extern GCOORD *getviewcells(); |
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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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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[8] = { /* current voxel list */ |
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{-1}, {-1}, {-1}, {-1}, |
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{-1}, {-1}, {-1}, {-1} |
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}; |
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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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short wants; /* flags telling which voxels want us */ |
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short hd; /* holodeck section number */ |
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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 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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}; /* action for cell */ |
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|
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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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|
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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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{ |
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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 (!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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return(cb1->hd - cb2->hd); /* use hd to resolve matches */ |
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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; |
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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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if (p == NULL) |
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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 = 0; cbeam[n].hd = hd; cbeam[n].bi = bi; |
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cbeam[n].nr = 0; cbeam[n].hd = hd; cbeam[n].bi = bi; |
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return(n); |
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} |
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|
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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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cbeamop(op, bl, n, v, hr, vr) /* update beams on server list */ |
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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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VIEW *v; |
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int hr, vr; |
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{ |
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register PACKHEAD *pa; |
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register int i; |
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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 cbeamadd"); |
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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 = v==NULL ? 0 : |
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npixels(v, hr, vr, hdlist[bl[i].hd], 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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int |
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set_voxels(vl, n) /* set new voxel array */ |
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VOXL vl[8]; |
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int n; |
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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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short wmap[256]; |
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int vmap[8]; |
188 |
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int comn = 0; |
193 |
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int no; |
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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 common voxels */ |
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for (j = 0; j < 8 && voxel[j].hd >= 0; j++) { |
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vmap[j] = -1; |
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for (i = n; i--; ) |
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if (!bcmp((char *)(vl+i), (char *)(voxel+j), |
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sizeof(VOXL))) { |
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vmap[j] = i; |
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comn |= 1<<i; |
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break; |
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} |
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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.) |
195 |
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dv[j] = -gp[j]; |
196 |
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else if (gp[j] > hdlist[i]->grid[j]) |
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dv[j] = gp[j] - hdlist[i]->grid[j]; |
198 |
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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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no = comn ? j : 0; /* compute flag mapping */ |
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for (i = 256; i--; ) { |
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wmap[i] = 0; |
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for (j = no; j--; ) |
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if (vmap[j] >= 0 && i & 1<<j) |
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wmap[i] |= 1<<vmap[j]; |
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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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/* fix cbeam flags */ |
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for (i = ncbeams; i--; ) |
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cbeam[i].wants = wmap[cbeam[i].wants]; |
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/* update our voxel list */ |
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bcopy((char *)vl, (char *)voxel, n*sizeof(VOXL)); |
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for (j = n; j < 8; j++) |
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voxel[j].hd = -1; |
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return(comn); /* return bit array of common voxels */ |
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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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int |
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get_voxels(vl, vp) /* find voxels corresponding to view point */ |
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VOXL vl[8]; |
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FVECT vp; |
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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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static int lastn = 0, lastd = -1; |
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int n = 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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< |
/* find closest voxels */ |
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< |
for (i = 0; n < 8 && hdlist[i]; i++) { |
238 |
< |
hdgrid(gp, hdlist[i], vp); |
239 |
< |
for (j = 0; n < 8 && j < 8; j++) { |
240 |
< |
dist = 0; |
241 |
< |
for (k = 0; k < 3; k++) { |
242 |
< |
d = gp[k] - .5 + (j>>k & 1); |
243 |
< |
if (d < 0.) |
244 |
< |
dist += -(vox.i[k] = (int)d - 1); |
245 |
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else if ((vox.i[k] = d) >= hdlist[i]->grid[k]) |
246 |
< |
dist += vox.i[k] - |
247 |
< |
hdlist[i]->grid[k] + 1; |
248 |
< |
} |
249 |
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if (dist > bestd) /* others were closer */ |
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int sampquant; |
230 |
> |
int h, v, shr, svr; |
231 |
> |
GCOORD gc[2]; |
232 |
> |
FVECT rorg, rdir; |
233 |
> |
/* compute sampling grid */ |
234 |
> |
if (hres|vres && hres*vres <= NVSAMPS) { |
235 |
> |
shr = hres; svr = vres; |
236 |
> |
sampquant = 1; |
237 |
> |
} else { |
238 |
> |
shr = sqrt(NVSAMPS/viewaspect(vw)) + .5; |
239 |
> |
svr = (NVSAMPS + shr/2)/shr; |
240 |
> |
sampquant = (hres*vres + shr*svr/2)/(shr*svr); |
241 |
> |
} |
242 |
> |
/* intersect sample rays with section */ |
243 |
> |
for (v = svr; v--; ) |
244 |
> |
for (h = shr; h--; ) { |
245 |
> |
if (viewray(rorg, rdir, vw, (v+frandom())/svr, |
246 |
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(h+frandom())/shr) < -FTINY) |
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continue; |
248 |
< |
if (dist < bestd) { /* start closer list */ |
249 |
< |
n = 0; |
250 |
< |
bestd = dist; |
251 |
< |
} |
252 |
< |
vox.hd = i; /* add this voxel */ |
256 |
< |
copystruct(&vl[n], &vox); |
257 |
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n++; |
248 |
> |
if (hdinter(gc, NULL, NULL, hdlist[hd], rorg, rdir) |
249 |
> |
>= FHUGE) |
250 |
> |
continue; |
251 |
> |
cbeam[getcbeam(hd,hdbindex(hdlist[hd],gc))].nr += |
252 |
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sampquant; |
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} |
259 |
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} |
260 |
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/* warn of dangerous moves */ |
261 |
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if (n < lastn && bestd >= lastd) |
262 |
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error(WARNING, "moving outside holodeck section"); |
263 |
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else if (n > lastn && bestd <= lastd) |
264 |
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error(WARNING, "moving inside holodeck section"); |
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lastd = bestd; |
266 |
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return(lastn = n); |
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} |
255 |
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|
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|
257 |
< |
int |
258 |
< |
dobeam(gcp, bp) /* express interest or disintrest in a beam */ |
272 |
< |
GCOORD *gcp; |
273 |
< |
register struct beamact *bp; |
257 |
> |
beam_init(fresh) /* clear beam list for new view(s) */ |
258 |
> |
int fresh; |
259 |
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{ |
260 |
< |
GCOORD gc[2]; |
261 |
< |
int bi, i; |
262 |
< |
/* compute beam index */ |
263 |
< |
if (bp->ca.rev) { |
264 |
< |
copystruct(gc, &bp->gc); |
265 |
< |
copystruct(gc+1, gcp); |
266 |
< |
} else { |
267 |
< |
copystruct(gc, gcp); |
283 |
< |
copystruct(gc+1, &bp->gc); |
284 |
< |
} |
285 |
< |
if ((bi = hdbindex(hdlist[voxel[bp->ca.vi].hd], gc)) <= 0) |
286 |
< |
error(CONSISTENCY, "bad grid coordinate in dobeam"); |
287 |
< |
if (bp->ca.add) { /* add it in */ |
288 |
< |
i = getcbeam(voxel[bp->ca.vi].hd, bi); |
289 |
< |
cbeam[i].wants |= 1<<bp->ca.vi; /* say we want it */ |
290 |
< |
return(i == ncbeams+xcbeams-1); /* return 1 if totally new */ |
291 |
< |
} |
292 |
< |
/* else delete it */ |
293 |
< |
i = findcbeam(voxel[bp->ca.vi].hd, bi); |
294 |
< |
if (i >= 0 && cbeam[i].wants & 1<<bp->ca.vi) { |
295 |
< |
cbeam[i].wants &= ~(1<<bp->ca.vi); /* we don't want it */ |
296 |
< |
return(1); /* indicate change */ |
297 |
< |
} |
298 |
< |
return(0); |
260 |
> |
register int i; |
261 |
> |
|
262 |
> |
if (fresh) /* discard old beams? */ |
263 |
> |
ncbeams = xcbeams = 0; |
264 |
> |
else /* else clear sample requests */ |
265 |
> |
for (i = ncbeams+xcbeams; i--; ) |
266 |
> |
cbeam[i].nr = 0; |
267 |
> |
cureye.rng = 0.; |
268 |
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} |
269 |
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|
270 |
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|
271 |
< |
|
272 |
< |
int |
273 |
< |
docell(gcp, cap) /* find beams corresponding to cell and voxel */ |
305 |
< |
GCOORD *gcp; |
306 |
< |
register struct cellact *cap; |
271 |
> |
beam_view(vn, hr, vr) /* add beam view (if advisable) */ |
272 |
> |
VIEW *vn; |
273 |
> |
int hr, vr; |
274 |
|
{ |
275 |
< |
FVECT org, dir[4]; |
276 |
< |
FVECT gp, cv[4], vc; |
277 |
< |
struct beamact bo; |
275 |
> |
int todo[MAXTODO+1], n; |
276 |
> |
double hdgsiz, d; |
277 |
> |
register HOLO *hp; |
278 |
|
register int i; |
279 |
< |
/* compute cell vertices */ |
280 |
< |
hdcell(cv, hdlist[voxel[cap->vi].hd], gcp); |
281 |
< |
/* compute cell and voxel centers */ |
282 |
< |
for (i = 0; i < 3; i++) { |
283 |
< |
org[i] = 0.5*(cv[0][i] + cv[2][i]); |
284 |
< |
gp[i] = voxel[cap->vi].i[i] + 0.5; |
279 |
> |
/* sort our list */ |
280 |
> |
cbeamsort(1); |
281 |
> |
/* add view to nearby sections */ |
282 |
> |
if (!(n = comptodo(todo, vn))) |
283 |
> |
return(0); |
284 |
> |
for (i = 0; i < n; i++) |
285 |
> |
addview(todo[i], vn, hr, vr); |
286 |
> |
if (MEYERNG <= FTINY || vn->type == VT_PAR) |
287 |
> |
return(1); |
288 |
> |
hdgsiz = 0.; d = 1./3. / n; /* compute mean grid size */ |
289 |
> |
for (i = 0; i < n; i++) { |
290 |
> |
hp = hdlist[todo[i]]; |
291 |
> |
hdgsiz += d * ( VLEN(hp->xv[0])/hp->grid[0] + |
292 |
> |
VLEN(hp->xv[1])/hp->grid[1] + |
293 |
> |
VLEN(hp->xv[2])/hp->grid[2] ) ; |
294 |
|
} |
295 |
< |
hdworld(vc, hdlist[voxel[cap->vi].hd], gp); |
296 |
< |
/* compute voxel pyramid using vector trick */ |
297 |
< |
for (i = 0; i < 3; i++) { |
298 |
< |
dir[0][i] = vc[i] - cv[0][i]; /* to 3 */ |
299 |
< |
dir[2][i] = vc[i] - cv[3][i]; /* to 0 */ |
300 |
< |
if (gcp->w & 1) { /* watch vertex order! */ |
301 |
< |
dir[1][i] = vc[i] - cv[2][i]; /* to 1 */ |
302 |
< |
dir[3][i] = vc[i] - cv[1][i]; /* to 2 */ |
303 |
< |
} else { |
328 |
< |
dir[1][i] = vc[i] - cv[1][i]; /* to 2 */ |
329 |
< |
dir[3][i] = vc[i] - cv[2][i]; /* to 1 */ |
330 |
< |
} |
295 |
> |
/* add to current eye position */ |
296 |
> |
if (cureye.rng <= FTINY) { |
297 |
> |
VCOPY(cureye.vpt, vn->vp); |
298 |
> |
cureye.rng = MEYERNG * hdgsiz; |
299 |
> |
} else if ((d = sqrt(dist2(vn->vp,cureye.vpt))) + MEYERNG*hdgsiz > |
300 |
> |
cureye.rng) { |
301 |
> |
for (i = 3; i--; ) |
302 |
> |
cureye.vpt[i] = 0.5*(cureye.vpt[i] + vn->vp[i]); |
303 |
> |
cureye.rng = 0.5*(cureye.rng + MEYERNG*hdgsiz + d); |
304 |
|
} |
305 |
< |
/* visit beams for opposite cells */ |
333 |
< |
copystruct(&bo.ca, cap); |
334 |
< |
copystruct(&bo.gc, gcp); |
335 |
< |
return(visit_cells(org, dir, hdlist[voxel[cap->vi].hd], dobeam, &bo)); |
305 |
> |
return(1); |
306 |
|
} |
307 |
|
|
308 |
|
|
309 |
|
int |
310 |
< |
doview(cap, vp) /* visit cells for a given view */ |
311 |
< |
struct cellact *cap; |
342 |
< |
VIEW *vp; |
310 |
> |
beam_sync(all) /* update beam list on server */ |
311 |
> |
int all; |
312 |
|
{ |
313 |
< |
int orient; |
314 |
< |
FVECT org, dir[4]; |
315 |
< |
/* compute view pyramid */ |
316 |
< |
orient = viewpyramid(org, dir, hdlist[voxel[cap->vi].hd], vp); |
317 |
< |
if (!orient) |
318 |
< |
error(INTERNAL, "unusable view in doview"); |
319 |
< |
cap->rev = orient < 0; |
320 |
< |
/* visit cells within pyramid */ |
321 |
< |
return(visit_cells(org, dir, hdlist[voxel[cap->vi].hd], docell, cap)); |
353 |
< |
} |
354 |
< |
|
355 |
< |
|
356 |
< |
mvview(voxi, vold, vnew) /* move view for a voxel */ |
357 |
< |
int voxi; |
358 |
< |
VIEW *vold, *vnew; |
359 |
< |
{ |
360 |
< |
int netchange = 0; |
361 |
< |
struct cellact oca, nca; |
362 |
< |
int ocnt, ncnt; |
363 |
< |
int c; |
364 |
< |
register GCOORD *ogcp, *ngcp; |
365 |
< |
/* get old and new cell lists */ |
366 |
< |
ogcp = getviewcells(&ocnt, hdlist[voxel[voxi].hd], vold); |
367 |
< |
ngcp = getviewcells(&ncnt, hdlist[voxel[voxi].hd], vnew); |
368 |
< |
/* set up actions */ |
369 |
< |
oca.vi = nca.vi = voxi; |
370 |
< |
oca.rev = nca.rev = 0; |
371 |
< |
oca.add = 0; nca.add = 1; |
372 |
< |
if ((oca.rev = ocnt < 0)) |
373 |
< |
ocnt = -ocnt; |
374 |
< |
if ((nca.rev = ncnt < 0)) |
375 |
< |
ncnt = -ncnt; |
376 |
< |
if (nca.rev == oca.rev) /* add and delete cells in order */ |
377 |
< |
while (ocnt > 0 & ncnt > 0) |
378 |
< |
if ((c = cellcmp(ogcp, ngcp)) > 0) { /* new cell */ |
379 |
< |
netchange += docell(ngcp++, &nca); |
380 |
< |
ncnt--; |
381 |
< |
} else if (c < 0) { /* old cell */ |
382 |
< |
netchange -= docell(ogcp++, &oca); |
383 |
< |
ocnt--; |
384 |
< |
} else { /* same cell */ |
385 |
< |
ogcp++; ocnt--; |
386 |
< |
ngcp++; ncnt--; |
387 |
< |
} |
388 |
< |
/* take care of list tails */ |
389 |
< |
for ( ; ncnt > 0; ncnt--) |
390 |
< |
netchange += docell(ngcp++, &nca); |
391 |
< |
for ( ; ocnt > 0; ocnt--) |
392 |
< |
netchange -= docell(ogcp++, &oca); |
393 |
< |
/* clean up */ |
394 |
< |
if (ogcp != NULL) free((char *)ogcp); |
395 |
< |
if (ngcp != NULL) free((char *)ngcp); |
396 |
< |
return(netchange); |
397 |
< |
} |
398 |
< |
|
399 |
< |
|
400 |
< |
beam_sync() /* synchronize beams on server */ |
401 |
< |
{ |
402 |
< |
cbeamop(DR_NEWSET, cbeam, ncbeams, &odev.v, odev.hres, odev.vres); |
403 |
< |
} |
404 |
< |
|
405 |
< |
|
406 |
< |
beam_view(vo, vn) /* change beam view */ |
407 |
< |
VIEW *vo, *vn; |
408 |
< |
{ |
409 |
< |
struct cellact ca; |
410 |
< |
VOXL vlnew[8]; |
411 |
< |
int n, comn; |
412 |
< |
|
413 |
< |
if (!vn->type) { /* clear our beam list */ |
414 |
< |
set_voxels(vlnew, 0); |
415 |
< |
cbeamop(DR_DELSET, cbeam, ncbeams, NULL, 0, 0); |
416 |
< |
ncbeams = 0; |
417 |
< |
return; |
418 |
< |
} |
419 |
< |
/* find our new voxels */ |
420 |
< |
n = get_voxels(vlnew, vn->vp); |
421 |
< |
/* set the new voxels */ |
422 |
< |
comn = set_voxels(vlnew, n); |
423 |
< |
if (!vo->type) |
424 |
< |
comn = 0; |
425 |
< |
ca.add = 1; /* update our beam list */ |
426 |
< |
for (ca.vi = n; ca.vi--; ) |
427 |
< |
if (comn & 1<<ca.vi) /* change which cells we see */ |
428 |
< |
mvview(ca.vi, vo, vn); |
429 |
< |
else /* else add all new cells */ |
430 |
< |
doview(&ca, vn); |
431 |
< |
/* inform server of new beams */ |
432 |
< |
cbeamop(DR_ADDSET, cbeam+ncbeams, xcbeams, vn, odev.hres, odev.vres); |
433 |
< |
/* sort list to put orphans at end */ |
434 |
< |
cbeamsort(0); |
435 |
< |
/* tell server to delete orphans */ |
436 |
< |
cbeamop(DR_DELSET, cbeam+ncbeams, xcbeams, NULL, 0, 0); |
313 |
> |
/* set new eye position */ |
314 |
> |
serv_request(DR_VIEWPOINT, sizeof(VIEWPOINT), (char *)&cureye); |
315 |
> |
/* sort list (put orphans at end) */ |
316 |
> |
cbeamsort(all < 0); |
317 |
> |
/* send beam request */ |
318 |
> |
if (all) |
319 |
> |
cbeamop(DR_NEWSET, cbeam, ncbeams); |
320 |
> |
else |
321 |
> |
cbeamop(DR_ADJSET, cbeam, ncbeams+xcbeams); |
322 |
|
xcbeams = 0; /* truncate our list */ |
323 |
+ |
return(ncbeams); |
324 |
|
} |