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#ifndef lint
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static const char RCSid[] = "$Id: rholo2.c,v 3.27 2003/07/27 22:12:02 schorsch 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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#include <time.h>
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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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VIEWPOINT myeye; /* target view position */
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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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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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static void
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initeyelim( /* 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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{
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register RREAL *v;
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register int i;
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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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static void
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groweyelim( /* 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,
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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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register 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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static int
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clipeyelim( /* 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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{
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int incell = 1;
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register int i;
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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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extern void
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packrays( /* 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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{
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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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register int i;
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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] = (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), 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] = (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 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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extern void
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donerays( /* 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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{
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double d;
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register int i;
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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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extern 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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extern 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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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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| 330 |
eputs("rtrace process restarted\n");
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report(0);
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}
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}
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| 334 |
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| 335 |
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| 336 |
extern int
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getradfile(void) /* run rad and get needed variables */
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| 338 |
{
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| 339 |
static short mvar[] = {OCTREE,EYESEP,-1};
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| 340 |
static char tf1[] = TEMPLATE;
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| 341 |
char tf2[64];
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| 342 |
char combuf[256];
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| 343 |
char *pippt = NULL;
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| 344 |
register int i;
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| 345 |
register char *cp;
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| 346 |
/* check if rad file specified */
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| 347 |
if (!vdef(RIF))
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| 348 |
return(0);
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| 349 |
/* create rad command */
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| 350 |
mktemp(tf1);
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| 351 |
sprintf(tf2, "%s.rif", tf1);
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| 352 |
sprintf(combuf,
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"rad -v 0 -s -e -w %s OPTFILE=%s | egrep '^[ \t]*(NOMATCH",
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| 354 |
vval(RIF), tf1);
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| 355 |
cp = combuf;
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| 356 |
while (*cp){
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| 357 |
if (*cp == '|') pippt = cp;
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| 358 |
cp++;
|
| 359 |
} /* match unset variables */
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| 360 |
for (i = 0; mvar[i] >= 0; i++)
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| 361 |
if (!vdef(mvar[i])) {
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| 362 |
*cp++ = '|';
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| 363 |
strcpy(cp, vnam(mvar[i]));
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| 364 |
while (*cp) cp++;
|
| 365 |
pippt = NULL;
|
| 366 |
}
|
| 367 |
if (pippt != NULL)
|
| 368 |
strcpy(pippt, "> " NULL_DEVICE); /* nothing to match */
|
| 369 |
else
|
| 370 |
sprintf(cp, ")[ \t]*=' > %s", tf2);
|
| 371 |
#ifdef DEBUG
|
| 372 |
wputs(combuf); wputs("\n");
|
| 373 |
#endif
|
| 374 |
system(combuf); /* ignore exit code */
|
| 375 |
if (pippt == NULL) {
|
| 376 |
loadvars(tf2); /* load variables */
|
| 377 |
unlink(tf2);
|
| 378 |
}
|
| 379 |
rtargc += wordfile(rtargv+rtargc, tf1); /* get rtrace options */
|
| 380 |
unlink(tf1); /* clean up */
|
| 381 |
return(1);
|
| 382 |
}
|
| 383 |
|
| 384 |
|
| 385 |
extern void
|
| 386 |
report( /* report progress so far */
|
| 387 |
time_t t
|
| 388 |
)
|
| 389 |
{
|
| 390 |
static time_t seconds2go = 1000000;
|
| 391 |
|
| 392 |
if (t == 0L)
|
| 393 |
t = time(NULL);
|
| 394 |
sprintf(errmsg, "%ld packets (%ld rays) done after %.2f hours\n",
|
| 395 |
npacksdone, nraysdone, (t-starttime)/3600.);
|
| 396 |
eputs(errmsg);
|
| 397 |
if (seconds2go == 1000000)
|
| 398 |
seconds2go = vdef(REPORT) ? (long)(vflt(REPORT)*60. + .5) : 0L;
|
| 399 |
if (seconds2go)
|
| 400 |
reporttime = t + seconds2go;
|
| 401 |
}
|
