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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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|
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/* |
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* Rtrace support routines for holodeck rendering |
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*/ |
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|
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#include "rholo.h" |
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#include "paths.h" |
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#include "random.h" |
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|
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|
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VIEWPOINT myeye; /* target view position */ |
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|
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struct gclim { |
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HOLO *hp; /* holodeck pointer */ |
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GCOORD gc; /* grid cell */ |
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FVECT egp; /* eye grid point */ |
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double erg2; /* mean square eye grid range */ |
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double gmin[2], gmax[2]; /* grid coordinate limits */ |
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}; /* a grid coordinate range */ |
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|
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|
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static |
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initeyelim(gcl, hp, gc) /* initialize grid coordinate limits */ |
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register struct gclim *gcl; |
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register HOLO *hp; |
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GCOORD *gc; |
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{ |
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register FLOAT *v; |
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register int i; |
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|
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if (hp != NULL) { |
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hdgrid(gcl->egp, gcl->hp = hp, myeye.vpt); |
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gcl->erg2 = 0; |
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for (i = 0, v = hp->wg[0]; i < 3; i++, v += 3) |
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gcl->erg2 += DOT(v,v); |
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gcl->erg2 *= (1./3.) * myeye.rng*myeye.rng; |
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} |
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if (gc != NULL) |
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copystruct(&gcl->gc, gc); |
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gcl->gmin[0] = gcl->gmin[1] = FHUGE; |
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gcl->gmax[0] = gcl->gmax[1] = -FHUGE; |
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} |
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|
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|
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static |
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groweyelim(gcl, gc, r0, r1) /* grow grid limits about eye point */ |
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register struct gclim *gcl; |
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GCOORD *gc; |
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double r0, r1; |
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{ |
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FVECT gp, ab; |
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double vlen, plen, dv0, dv1; |
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double rd2, dwall, gpos; |
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int eyeout; |
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register int i, g0, g1; |
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|
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i = gc->w>>1; |
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if (gc->w&1) |
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eyeout = (gp[i] = gcl->hp->grid[i]) < gcl->egp[i]; |
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else |
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eyeout = (gp[i] = 0) > gcl->egp[i]; |
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gp[hdwg0[gc->w]] = gc->i[0] + r0; |
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gp[hdwg1[gc->w]] = gc->i[1] + r1; |
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VSUB(ab, gcl->egp, gp); |
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rd2 = DOT(ab,ab); |
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if (rd2 <= gcl->erg2) { |
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gcl->gmin[0] = gcl->gmin[1] = -FHUGE; |
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gcl->gmax[0] = gcl->gmax[1] = FHUGE; |
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return; |
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} |
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rd2 = gcl->erg2 / rd2; |
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vlen = 1. - rd2; |
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plen = sqrt(rd2 * vlen); |
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g0 = gcl->gc.w>>1; |
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dwall = (gcl->gc.w&1 ? gcl->hp->grid[g0] : 0) - gp[g0]; |
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for (i = 0; i < 4; i++) { |
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if (i == 2) |
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plen = -plen; |
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g1 = (g0+(i&1)+1)%3; |
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dv0 = vlen*ab[g0] + plen*ab[g1]; |
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dv1 = vlen*ab[g1] - plen*ab[g0]; |
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if ((dv0 < 0 ^ dwall < 0 ^ eyeout) || |
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(dv0 <= FTINY && dv0 >= -FTINY)) { |
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if (eyeout) |
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dv1 = -dv1; |
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if (dv1 > FTINY) |
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gcl->gmax[i&1] = FHUGE; |
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else if (dv1 < -FTINY) |
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gcl->gmin[i&1] = -FHUGE; |
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} else { |
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gpos = gp[g1] + dv1*dwall/dv0; |
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if (gpos < gcl->gmin[i&1]) |
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gcl->gmin[i&1] = gpos; |
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if (gpos > gcl->gmax[i&1]) |
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gcl->gmax[i&1] = gpos; |
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} |
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} |
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} |
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|
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|
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static int |
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clipeyelim(rrng, gcl) /* clip eye limits to grid cell */ |
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register short rrng[2][2]; |
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register struct gclim *gcl; |
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{ |
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int incell = 1; |
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register int i; |
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|
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for (i = 0; i < 2; i++) { |
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if (gcl->gmin[i] < gcl->gc.i[i]) |
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gcl->gmin[i] = gcl->gc.i[i]; |
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if (gcl->gmax[i] > gcl->gc.i[i]+1) |
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gcl->gmax[i] = gcl->gc.i[i]+1; |
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if (gcl->gmax[i] > gcl->gmin[i]) { |
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rrng[i][0] = 256.*(gcl->gmin[i] - gcl->gc.i[i]) + |
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(1.-FTINY); |
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rrng[i][1] = 256.*(gcl->gmax[i] - gcl->gc.i[i]) + |
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(1.-FTINY) - rrng[i][0]; |
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} else |
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rrng[i][0] = rrng[i][1] = 0; |
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incell &= rrng[i][1] > 0; |
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} |
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return(incell); |
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} |
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|
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|
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packrays(rod, p) /* pack ray origins and directions */ |
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register float *rod; |
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register PACKET *p; |
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{ |
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int nretries = p->nr + 2; |
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struct gclim eyelim; |
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short rrng0[2][2], rrng1[2][2]; |
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int useyelim; |
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GCOORD gc[2]; |
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FVECT ro, rd; |
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double d; |
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register int i; |
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|
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if (!hdbcoord(gc, hdlist[p->hd], p->bi)) |
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error(CONSISTENCY, "bad beam index in packrays"); |
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if ((useyelim = myeye.rng > FTINY)) { |
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initeyelim(&eyelim, hdlist[p->hd], gc); |
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groweyelim(&eyelim, gc+1, 0., 0.); |
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groweyelim(&eyelim, gc+1, 1., 1.); |
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useyelim &= clipeyelim(rrng0, &eyelim); |
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} |
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for (i = 0; i < p->nr; i++) { |
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retry: |
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if (useyelim) { |
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initeyelim(&eyelim, NULL, gc+1); |
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p->ra[i].r[0][0] = (int)(frandom()*rrng0[0][1]) |
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+ rrng0[0][0]; |
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p->ra[i].r[0][1] = (int)(frandom()*rrng0[1][1]) |
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+ rrng0[1][0]; |
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groweyelim(&eyelim, gc, |
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(1./256.)*(p->ra[i].r[0][0]+.5), |
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(1./256.)*(p->ra[i].r[0][1]+.5)); |
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if (!clipeyelim(rrng1, &eyelim)) { |
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useyelim &= nretries-- > 0; |
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goto retry; |
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} |
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p->ra[i].r[1][0] = (int)(frandom()*rrng1[0][1]) |
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+ rrng1[0][0]; |
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p->ra[i].r[1][1] = (int)(frandom()*rrng1[1][1]) |
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+ rrng1[1][0]; |
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} else { |
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p->ra[i].r[0][0] = frandom() * 256.; |
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p->ra[i].r[0][1] = frandom() * 256.; |
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p->ra[i].r[1][0] = frandom() * 256.; |
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p->ra[i].r[1][1] = frandom() * 256.; |
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} |
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d = hdray(ro, rd, hdlist[p->hd], gc, p->ra[i].r); |
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if (p->offset != NULL) { |
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if (!vdef(OBSTRUCTIONS)) |
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d *= frandom(); /* random offset */ |
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VSUM(ro, ro, rd, d); /* advance ray */ |
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p->offset[i] = d; |
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} |
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VCOPY(rod, ro); |
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rod += 3; |
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VCOPY(rod, rd); |
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rod += 3; |
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} |
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} |
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|
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|
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donerays(p, rvl) /* encode finished ray computations */ |
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register PACKET *p; |
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register float *rvl; |
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{ |
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double d; |
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register int i; |
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|
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for (i = 0; i < p->nr; i++) { |
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setcolr(p->ra[i].v, rvl[0], rvl[1], rvl[2]); |
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d = rvl[3]; |
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if (p->offset != NULL) |
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d += p->offset[i]; |
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p->ra[i].d = hdcode(hdlist[p->hd], d); |
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rvl += 4; |
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} |
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p->nc += p->nr; |
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} |
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|
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|
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int |
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done_rtrace() /* clean up and close rtrace calculation */ |
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{ |
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int status; |
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/* already closed? */ |
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if (!nprocs) |
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return; |
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/* flush beam queue */ |
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done_packets(flush_queue()); |
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/* sync holodeck */ |
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hdsync(NULL, 1); |
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/* close rtrace */ |
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if ((status = end_rtrace())) |
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error(WARNING, "bad exit status from rtrace"); |
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if (vdef(REPORT)) { /* report time */ |
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eputs("rtrace process closed\n"); |
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report(0); |
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} |
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return(status); /* return status */ |
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} |
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|
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|
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new_rtrace() /* restart rtrace calculation */ |
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{ |
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char combuf[128]; |
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|
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if (nprocs > 0) /* already running? */ |
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return; |
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starttime = time(NULL); /* reset start time and counts */ |
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npacksdone = nraysdone = 0L; |
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if (vdef(TIME)) /* reset end time */ |
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endtime = starttime + vflt(TIME)*3600. + .5; |
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if (vdef(RIF)) { /* rerun rad to update octree */ |
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sprintf(combuf, "rad -v 0 -s -w %s", vval(RIF)); |
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if (system(combuf)) |
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error(WARNING, "error running rad"); |
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} |
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if (start_rtrace() < 1) /* start rtrace */ |
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error(WARNING, "cannot restart rtrace"); |
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else if (vdef(REPORT)) { |
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eputs("rtrace process restarted\n"); |
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report(0); |
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} |
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} |
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|
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|
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getradfile() /* run rad and get needed variables */ |
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{ |
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static short mvar[] = {OCTREE,EYESEP,-1}; |
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static char tf1[] = TEMPLATE; |
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char tf2[64]; |
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char combuf[256]; |
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char *pippt; |
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register int i; |
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register char *cp; |
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/* check if rad file specified */ |
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if (!vdef(RIF)) |
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return(0); |
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/* create rad command */ |
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mktemp(tf1); |
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sprintf(tf2, "%s.rif", tf1); |
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sprintf(combuf, |
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"rad -v 0 -s -e -w %s OPTFILE=%s | egrep '^[ \t]*(NOMATCH", |
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vval(RIF), tf1); |
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cp = combuf; |
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while (*cp){ |
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if (*cp == '|') pippt = cp; |
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cp++; |
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} /* match unset variables */ |
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for (i = 0; mvar[i] >= 0; i++) |
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if (!vdef(mvar[i])) { |
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*cp++ = '|'; |
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strcpy(cp, vnam(mvar[i])); |
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while (*cp) cp++; |
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pippt = NULL; |
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} |
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if (pippt != NULL) |
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strcpy(pippt, "> /dev/null"); /* nothing to match */ |
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else |
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sprintf(cp, ")[ \t]*=' > %s", tf2); |
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#ifdef DEBUG |
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wputs(combuf); wputs("\n"); |
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#endif |
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system(combuf); /* ignore exit code */ |
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if (pippt == NULL) { |
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loadvars(tf2); /* load variables */ |
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unlink(tf2); |
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} |
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rtargc += wordfile(rtargv+rtargc, tf1); /* get rtrace options */ |
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unlink(tf1); /* clean up */ |
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return(1); |
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} |
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|
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|
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report(t) /* report progress so far */ |
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time_t t; |
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{ |
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static time_t seconds2go = 1000000; |
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|
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if (t == 0L) |
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t = time(NULL); |
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sprintf(errmsg, "%ld packets (%ld rays) done after %.2f hours\n", |
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npacksdone, nraysdone, (t-starttime)/3600.); |
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eputs(errmsg); |
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if (seconds2go == 1000000) |
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seconds2go = vdef(REPORT) ? (long)(vflt(REPORT)*60. + .5) : 0L; |
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if (seconds2go) |
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reporttime = t + seconds2go; |
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} |
