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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 "rhdisp.h" |
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#include "rhdriver.h" |
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extern int *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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|
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extern GCOORD *getviewcells(); |
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|
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static VIEW dvw; /* current view corresponding to beam list */ |
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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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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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struct beamact { |
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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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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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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].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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VOXL vl[8]; |
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FVECT vp; |
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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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n++; |
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} |
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} |
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/* warn of dangerous moves */ |
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if (n < lastn && bestd >= lastd) |
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error(WARNING, "moving outside holodeck section"); |
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else if (n > lastn && bestd <= lastd) |
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error(WARNING, "moving inside holodeck section"); |
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lastd = bestd; |
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return(lastn = n); |
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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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return(n); |
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} |
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GCOORD gc[2]; |
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int bi, i; |
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/* compute beam index */ |
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copystruct(gc, gcp); |
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copystruct(gc+1, &bp->gc); |
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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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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 gp, cv[4], vc; |
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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 vertices */ |
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hdcell(cv, hdlist[voxel[cap->vi].hd], gcp); |
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/* compute cell and voxel centers */ |
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for (i = 0; i < 3; i++) { |
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org[i] = 0.5*(cv[0][i] + cv[2][i]); |
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gp[i] = voxel[cap->vi].i[i] + 0.5; |
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} |
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hdworld(vc, hdlist[voxel[cap->vi].hd], gp); |
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/* compute voxel pyramid using vector trick */ |
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for (i = 0; i < 3; i++) { |
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dir[0][i] = vc[i] - cv[0][i]; /* to 3 */ |
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dir[2][i] = vc[i] - cv[3][i]; /* to 0 */ |
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if (gcp->w & 1) { /* watch vertex order! */ |
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dir[1][i] = vc[i] - cv[2][i]; /* to 1 */ |
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dir[3][i] = vc[i] - cv[1][i]; /* to 2 */ |
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} else { |
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dir[1][i] = vc[i] - cv[1][i]; /* to 2 */ |
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dir[3][i] = vc[i] - cv[2][i]; /* to 1 */ |
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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; |
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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; |
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for (i = 3; i--; ) { |
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d = vgp[i] - cgp[i]; |
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if (d < 0.) d = -d; |
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if (d > avmax) { |
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avmax = d; |
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axmax = i; |
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} |
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} |
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#ifdef DEBUG |
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if (axmax < 0.) |
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error(CONSISTENCY, "botched axis computation in docell"); |
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#endif |
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/* compute offset vectors */ |
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d = 0.5/hp->grid[j=(axmax+1)%3]; |
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for (i = 3; i--; ) |
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v1[i] = hp->xv[j][i] * d; |
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d = 0.5/hp->grid[j=(axmax+2)%3]; |
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if (DOT(hp->wg[axmax], vc) < 0.) |
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d = -d; /* reverse vertex order */ |
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for (i = 3; i--; ) |
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v2[i] = hp->xv[j][i] * d; |
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/* compute voxel pyramid */ |
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for (i = 3; i--; ) { |
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dir[0][i] = vc[i] - v1[i] - v2[i]; |
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dir[1][i] = vc[i] + v1[i] - v2[i]; |
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dir[2][i] = vc[i] + v1[i] + v2[i]; |
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dir[3][i] = vc[i] - v1[i] + v2[i]; |
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} |
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/* visit beams for opposite cells */ |
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copystruct(&bo.ca, cap); |
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copystruct(&bo.gc, gcp); |
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return(visit_cells(org, dir, hdlist[voxel[cap->vi].hd], dobeam, &bo)); |
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return(visit_cells(org, dir, hp, dobeam, &bo)); |
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} |
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struct cellact *cap; |
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VIEW *vp; |
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{ |
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int orient; |
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FVECT org, dir[4]; |
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/* compute view pyramid */ |
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if (vp->type == VT_PAR) goto viewerr; |
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if (viewray(org, dir[0], vp, 0., 0.) < -FTINY) goto viewerr; |
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if (viewray(org, dir[1], vp, 0., 1.) < -FTINY) goto viewerr; |
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if (viewray(org, dir[2], vp, 1., 1.) < -FTINY) goto viewerr; |
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if (viewray(org, dir[3], vp, 1., 0.) < -FTINY) goto viewerr; |
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orient = viewpyramid(org, dir, hdlist[voxel[cap->vi].hd], vp); |
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if (!orient) |
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error(INTERNAL, "unusable view in doview"); |
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cap->rev = orient < 0; |
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/* visit cells within pyramid */ |
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return(visit_cells(org, dir, hdlist[voxel[cap->vi].hd], docell, cap)); |
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viewerr: |
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error(INTERNAL, "unusable view in doview"); |
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} |
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VIEW *vold, *vnew; |
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{ |
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int netchange = 0; |
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int *ocl, *ncl; |
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struct cellact ca; |
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struct cellact oca, nca; |
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int ocnt, ncnt; |
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int c; |
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GCOORD *ogcl, *ngcl; |
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register GCOORD *ogcp, *ngcp; |
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/* get old and new cell lists */ |
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ocl = getviewcells(hdlist[voxel[voxi].hd], vold); |
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ncl = getviewcells(hdlist[voxel[voxi].hd], vnew); |
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if (ocl != NULL) { |
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ocnt = *ocl; ogcp = (GCOORD *)(ocl+1); |
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} else { |
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ocnt = 0; ogcp = NULL; |
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} |
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if (ncl != NULL) { |
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ncnt = *ncl; ngcp = (GCOORD *)(ncl+1); |
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} else { |
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ncnt = 0; ngcp = NULL; |
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} |
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ca.vi = voxi; /* add and delete cells */ |
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while (ocnt > 0 & ncnt > 0) |
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if ((c = cellcmp(ogcp, ngcp)) > 0) { |
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ca.add = 1; /* new cell */ |
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netchange += docell(ngcp++, &ca); |
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ncnt--; |
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} else if (c < 0) { |
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ca.add = 0; /* obsolete cell */ |
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netchange -= docell(ogcp++, &ca); |
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ocnt--; |
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} else { |
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ogcp++; ocnt--; /* unchanged cell */ |
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ngcp++; ncnt--; |
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} |
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ogcp = ogcl = getviewcells(&ocnt, hdlist[voxel[voxi].hd], vold); |
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ngcp = ngcl = getviewcells(&ncnt, hdlist[voxel[voxi].hd], vnew); |
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/* set up actions */ |
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oca.vi = nca.vi = voxi; |
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oca.add = 0; nca.add = 1; |
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if ((oca.rev = ocnt < 0)) |
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ocnt = -ocnt; |
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if ((nca.rev = ncnt < 0)) |
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ncnt = -ncnt; |
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if (nca.rev == oca.rev) /* add and delete cells in order */ |
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while (ocnt > 0 & ncnt > 0) |
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if ((c = cellcmp(ogcp, ngcp)) > 0) { /* new cell */ |
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netchange += docell(ngcp++, &nca); |
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ncnt--; |
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} else if (c < 0) { /* old cell */ |
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netchange -= docell(ogcp++, &oca); |
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ocnt--; |
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} else { /* same cell */ |
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ogcp++; ocnt--; |
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ngcp++; ncnt--; |
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} |
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/* take care of list tails */ |
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for (ca.add = 1; ncnt > 0; ncnt--) |
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netchange += docell(ngcp++, &ca); |
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for (ca.add = 0; ocnt > 0; ocnt--) |
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netchange -= docell(ogcp++, &ca); |
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for ( ; ncnt > 0; ncnt--) |
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netchange += docell(ngcp++, &nca); |
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for ( ; ocnt > 0; ocnt--) |
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netchange -= docell(ogcp++, &oca); |
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/* clean up */ |
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< |
if (ocl != NULL) free((char *)ocl); |
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< |
if (ncl != NULL) free((char *)ncl); |
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> |
if (ogcl != NULL) free((char *)ogcl); |
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> |
if (ngcl != NULL) free((char *)ngcl); |
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return(netchange); |
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} |
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int |
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beam_sync() /* synchronize beams on server */ |
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{ |
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cbeamop(DR_NEWSET, cbeam, ncbeams, &odev.v, odev.hres, odev.vres); |
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return(ncbeams); |
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} |
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beam_view(vo, vn) /* change beam view */ |
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VIEW *vo, *vn; |
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beam_view(vn) /* change beam view (if advisable) */ |
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> |
VIEW *vn; |
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{ |
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struct cellact ca; |
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VOXL vlnew[8]; |
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int n, comn; |
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if (!vn->type) { /* clear our beam list */ |
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> |
if (vn == NULL || !vn->type) { /* clear our beam list */ |
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set_voxels(vlnew, 0); |
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cbeamop(DR_DELSET, cbeam, ncbeams, NULL, 0, 0); |
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ncbeams = 0; |
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return; |
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> |
dvw.type = 0; |
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> |
return(1); |
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} |
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/* find our new voxels */ |
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n = get_voxels(vlnew, vn->vp); |
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if (dvw.type && !n) { |
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copystruct(vn, &dvw); /* cancel move */ |
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return(0); |
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} |
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/* set the new voxels */ |
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comn = set_voxels(vlnew, n); |
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if (!vo->type) |
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> |
if (!dvw.type) |
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comn = 0; |
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ca.add = 1; /* update our beam list */ |
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for (ca.vi = n; ca.vi--; ) |
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if (comn & 1<<ca.vi) /* change which cells we see */ |
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mvview(ca.vi, vo, vn); |
| 467 |
> |
mvview(ca.vi, &dvw, vn); |
| 468 |
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else /* else add all new cells */ |
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doview(&ca, vn); |
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/* inform server of new beams */ |
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/* tell server to delete orphans */ |
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cbeamop(DR_DELSET, cbeam+ncbeams, xcbeams, NULL, 0, 0); |
| 476 |
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xcbeams = 0; /* truncate our list */ |
| 477 |
+ |
copystruct(&dvw, vn); /* record new view */ |
| 478 |
+ |
return(1); |
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} |
