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#ifndef lint |
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static const char RCSid[] = "$Id: rholo2.c,v 3.30 2018/10/05 19:19:16 greg Exp $"; |
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#endif |
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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 <time.h> |
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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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static void initeyelim(struct gclim *gcl, HOLO *hp, GCOORD *gc); |
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static void groweyelim(struct gclim *gcl, GCOORD *gc, |
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double r0, double r1, int tight); |
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static int clipeyelim(short rrng[2][2], struct gclim *gcl); |
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|
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|
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static void |
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initeyelim( /* initialize grid coordinate limits */ |
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struct gclim *gcl, |
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HOLO *hp, |
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GCOORD *gc |
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) |
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{ |
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RREAL *v; |
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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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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 void |
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groweyelim( /* grow grid limits about eye point */ |
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struct gclim *gcl, |
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GCOORD *gc, |
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double r0, |
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double r1, |
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int tight |
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) |
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{ |
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FVECT gp, ab; |
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double ab2, od, cfact; |
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double sqcoef[3], ctcoef[3], licoef[3], cnst; |
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int gw, gi[2]; |
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double wallpos, a, b, c, d, e, f; |
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double root[2], yex; |
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int n, i, j, nex; |
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/* point/view cone */ |
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i = gc->w>>1; |
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gp[i] = gc->w&1 ? gcl->hp->grid[i] : 0; |
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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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ab2 = DOT(ab, ab); |
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gw = gcl->gc.w>>1; |
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if ((i==gw ? ab[gw]*ab[gw] : ab2) <= gcl->erg2 + FTINY) { |
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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; /* too close (to wall) */ |
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} |
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ab2 = 1./ab2; /* 1/norm2(ab) */ |
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od = DOT(gp, ab); /* origin dot direction */ |
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cfact = 1./(1. - ab2*gcl->erg2); /* tan^2 + 1 of cone angle */ |
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for (i = 0; i < 3; i++) { /* compute cone equation */ |
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sqcoef[i] = ab[i]*ab[i]*cfact*ab2 - 1.; |
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ctcoef[i] = 2.*ab[i]*ab[(i+1)%3]*cfact*ab2; |
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licoef[i] = 2.*(gp[i] - ab[i]*cfact*od*ab2); |
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} |
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cnst = cfact*od*od*ab2 - DOT(gp,gp); |
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/* |
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* CONE: sqcoef[0]*x*x + sqcoef[1]*y*y + sqcoef[2]*z*z |
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* + ctcoef[0]*x*y + ctcoef[1]*y*z + ctcoef[2]*z*x |
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* + licoef[0]*x + licoef[1]*y + licoef[2]*z + cnst == 0 |
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*/ |
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/* equation for conic section in plane */ |
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gi[0] = hdwg0[gcl->gc.w]; |
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gi[1] = hdwg1[gcl->gc.w]; |
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wallpos = gcl->gc.w&1 ? gcl->hp->grid[gw] : 0; |
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a = sqcoef[gi[0]]; /* x2 */ |
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b = ctcoef[gi[0]]; /* xy */ |
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c = sqcoef[gi[1]]; /* y2 */ |
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d = ctcoef[gw]*wallpos + licoef[gi[0]]; /* x */ |
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e = ctcoef[gi[1]]*wallpos + licoef[gi[1]]; /* y */ |
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f = wallpos*(wallpos*sqcoef[gw] + licoef[gw]) + cnst; |
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for (i = 0; i < 2; i++) { |
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if (i) { /* swap x and y coefficients */ |
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double t; |
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t = a; a = c; c = t; |
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t = d; d = e; e = t; |
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} |
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nex = 0; /* check global extrema */ |
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n = quadratic(root, a*(4.*a*c-b*b), 2.*a*(2.*c*d-b*e), |
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d*(c*d-b*e) + f*b*b); |
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while (n-- > 0) { |
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if (gc->w>>1 == gi[i] && |
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(gc->w&1) ^ (root[n] < gp[gc->w>>1])) { |
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if (gc->w&1) |
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gcl->gmin[i] = -FHUGE; |
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else |
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gcl->gmax[i] = FHUGE; |
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nex++; |
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continue; /* hyperbolic */ |
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} |
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if (tight) { |
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yex = (-2.*a*root[n] - d)/b; |
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if (yex < gcl->gc.i[1-i] || |
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yex > gcl->gc.i[1-i]+1) |
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continue; /* outside cell */ |
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} |
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if (root[n] < gcl->gmin[i]) |
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gcl->gmin[i] = root[n]; |
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if (root[n] > gcl->gmax[i]) |
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gcl->gmax[i] = root[n]; |
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nex++; |
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} |
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/* check local extrema */ |
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for (j = nex < 2 ? 2 : 0; j--; ) { |
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yex = gcl->gc.i[1-i] + j; |
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n = quadratic(root, a, b*yex+d, yex*(yex*c+e)+f); |
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while (n-- > 0) { |
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if (gc->w>>1 == gi[i] && |
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(gc->w&1) ^ (root[n] < gp[gc->w>>1])) |
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continue; |
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if (root[n] < gcl->gmin[i]) |
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gcl->gmin[i] = root[n]; |
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if (root[n] > gcl->gmax[i]) |
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gcl->gmax[i] = root[n]; |
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} |
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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( /* clip eye limits to grid cell */ |
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short rrng[2][2], |
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struct gclim *gcl |
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) |
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{ |
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int incell = 1; |
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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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void |
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packrays( /* pack ray origins and directions */ |
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float *rod, |
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PACKET *p |
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) |
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{ |
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#if 0 |
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double dist2sum = 0.; |
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FVECT vt; |
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#endif |
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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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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., 0); |
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groweyelim(&eyelim, gc+1, 1., 1., 0); |
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useyelim = clipeyelim(rrng0, &eyelim); |
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#ifdef DEBUG |
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if (!useyelim) |
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error(WARNING, "no eye overlap in packrays"); |
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#endif |
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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] = irandom(rrng0[0][1]) + rrng0[0][0]; |
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p->ra[i].r[0][1] = irandom(rrng0[1][1]) + 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), 1); |
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if (!clipeyelim(rrng1, &eyelim)) { |
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useyelim = nretries-- > 0; |
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#ifdef DEBUG |
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if (!useyelim) |
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error(WARNING, |
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"exceeded retry limit in packrays"); |
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#endif |
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goto retry; |
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} |
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p->ra[i].r[1][0] = irandom(rrng1[0][1]) + rrng1[0][0]; |
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p->ra[i].r[1][1] = irandom(rrng1[1][1]) + rrng1[1][0]; |
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} else { |
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p->ra[i].r[0][0] = random() & 0xff; |
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p->ra[i].r[0][1] = random() & 0xff; |
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p->ra[i].r[1][0] = random() & 0xff; |
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p->ra[i].r[1][1] = random() & 0xff; |
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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 0 |
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VSUM(vt, ro, rd, d); |
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dist2sum += dist2line(myeye.vpt, ro, vt); |
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#endif |
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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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#if 0 |
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fprintf(stderr, "%f RMS (%d retries)\t", sqrt(dist2sum/p->nr), |
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p->nr + 2 - nretries); |
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#endif |
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} |
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|
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|
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void |
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donerays( /* encode finished ray computations */ |
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PACKET *p, |
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float *rvl |
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) |
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{ |
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double d; |
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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(void) /* 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(0); |
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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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void |
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new_rtrace(void) /* 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; |
| 318 |
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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int |
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getradfile(void) /* 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 = NULL; |
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int i; |
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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 */ |
| 346 |
mktemp(tf1); |
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sprintf(tf2, "%s.rif", tf1); |
| 348 |
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; |
| 352 |
while (*cp){ |
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if (*cp == '|') pippt = cp; |
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cp++; |
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} /* match unset variables */ |
| 356 |
for (i = 0; mvar[i] >= 0; i++) |
| 357 |
if (!vdef(mvar[i])) { |
| 358 |
*cp++ = '|'; |
| 359 |
strcpy(cp, vnam(mvar[i])); |
| 360 |
while (*cp) cp++; |
| 361 |
pippt = NULL; |
| 362 |
} |
| 363 |
if (pippt != NULL) |
| 364 |
strcpy(pippt, "> " NULL_DEVICE); /* nothing to match */ |
| 365 |
else |
| 366 |
sprintf(cp, ")[ \t]*=' > %s", tf2); |
| 367 |
#ifdef DEBUG |
| 368 |
wputs(combuf); wputs("\n"); |
| 369 |
#endif |
| 370 |
system(combuf); /* ignore exit code */ |
| 371 |
if (pippt == NULL) { |
| 372 |
loadvars(tf2); /* load variables */ |
| 373 |
unlink(tf2); |
| 374 |
} |
| 375 |
/* get rtrace options */ |
| 376 |
rtargc += wordfile(rtargv+rtargc, MAXRTARGC-rtargc, tf1); |
| 377 |
unlink(tf1); /* clean up */ |
| 378 |
return(1); |
| 379 |
} |
| 380 |
|
| 381 |
|
| 382 |
void |
| 383 |
report( /* report progress so far */ |
| 384 |
time_t t |
| 385 |
) |
| 386 |
{ |
| 387 |
static time_t seconds2go = 1000000; |
| 388 |
|
| 389 |
if (t == 0L) |
| 390 |
t = time(NULL); |
| 391 |
sprintf(errmsg, "%ld packets (%ld rays) done after %.2f hours\n", |
| 392 |
npacksdone, nraysdone, (t-starttime)/3600.); |
| 393 |
eputs(errmsg); |
| 394 |
if (seconds2go == 1000000) |
| 395 |
seconds2go = vdef(REPORT) ? (long)(vflt(REPORT)*60. + .5) : 0L; |
| 396 |
if (seconds2go) |
| 397 |
reporttime = t + seconds2go; |
| 398 |
} |
