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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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} |
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|
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int |
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dispbeam(b, hp, bi) /* display a holodeck beam */ |
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register BEAM *b; |
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+ |
HOLO *hp; |
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int bi; |
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{ |
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static int n = 0; |
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static PACKHEAD *p = NULL; |
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|
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if (b == NULL) |
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return; |
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if (b->nrm > n) { /* (re)allocate packet holder */ |
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n = b->nrm; |
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if (p == NULL) p = (PACKHEAD *)malloc(packsiz(n)); |
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else p = (PACKHEAD *)realloc((char *)p, packsiz(n)); |
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if (p == NULL) |
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error(SYSTEM, "out of memory in dispbeam"); |
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} |
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/* assign packet fields */ |
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bcopy((char *)hdbray(b), (char *)packra(p), b->nrm*sizeof(RAYVAL)); |
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p->nr = p->nc = b->nrm; |
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for (p->hd = 0; hdlist[p->hd] != hp; p->hd++) |
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if (hdlist[p->hd] == NULL) |
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error(CONSISTENCY, "unregistered holodeck in dispbeam"); |
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p->bi = bi; |
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disp_packet(p); /* display it */ |
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} |
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|
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|
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bundle_set(op, clist, nents) /* bundle set operation */ |
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int op; |
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PACKHEAD *clist; |
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register PACKHEAD *clist; |
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int nents; |
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{ |
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BEAM *b; |
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PACKHEAD *p; |
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register int i, n; |
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|
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switch (op) { |
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if (complist == NULL) |
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goto memerr; |
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bcopy((char *)clist, (char *)complist, nents*sizeof(PACKHEAD)); |
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complen = nents; |
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listpos = 0; |
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lastin = -1; /* flag for initial sort */ |
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complen = nents; /* finish initialization below */ |
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break; |
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case BS_ADD: /* add to computation set */ |
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case BS_ADJ: /* adjust set quantities */ |
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if (nents <= 0) |
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return; |
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/* merge any common members */ |
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for (i = 0; i < complen; i++) { |
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for (n = 0; n < nents; n++) |
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for (n = 0; n < nents; n++) { |
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for (i = 0; i < complen; i++) |
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if (clist[n].bi == complist[i].bi && |
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clist[n].hd == complist[i].hd) { |
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int oldnr = complist[i].nr; |
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if (op == BS_ADD) |
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complist[i].nr += clist[n].nr; |
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else /* op == BS_ADJ */ |
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complist[i].nr = clist[n].nr; |
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clist[n].nr = 0; |
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clist[n].nc = 1; |
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lastin = -1; /* flag full sort */ |
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clist[n].nc = complist[i].nc; |
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if (complist[i].nr != oldnr) |
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lastin = -1; /* flag sort */ |
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break; |
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} |
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if (n >= nents) |
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clist[i].nc = bnrays(hdlist[clist[i].hd], |
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clist[i].bi); |
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if (i >= complen) |
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clist[n].nc = bnrays(hdlist[clist[n].hd], |
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clist[n].bi); |
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} |
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/* sort updated list */ |
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sortcomplist(); |
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default: |
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error(CONSISTENCY, "bundle_set called with unknown operation"); |
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} |
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if (outdev == NULL) |
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return; |
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n = 32*RPACKSIZ; /* allocate packet holder */ |
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p = (PACKHEAD *)malloc(packsiz(n)); |
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if (p == NULL) |
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goto memerr; |
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/* display what we have */ |
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for (i = 0; i < nents; i++) |
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if ((b = hdgetbeam(hdlist[clist[i].hd], clist[i].bi)) != NULL) { |
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if (b->nrm > n) { |
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n = b->nrm; |
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p = (PACKHEAD *)realloc((char *)p, packsiz(n)); |
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if (p == NULL) |
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goto memerr; |
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} |
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bcopy((char *)hdbray(b), (char *)packra(p), |
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b->nrm*sizeof(RAYVAL)); |
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p->hd = clist[i].hd; |
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p->bi = clist[i].bi; |
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p->nr = p->nc = b->nrm; |
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disp_packet(p); |
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if (outdev != NULL) { /* load and display beams we have */ |
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register HDBEAMI *hb; |
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|
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hb = (HDBEAMI *)malloc(nents*sizeof(HDBEAMI)); |
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for (i = 0; i < nents; i++) { |
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hb[i].h = hdlist[clist[i].hd]; |
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hb[i].b = clist[i].bi; |
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} |
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free((char *)p); /* clean up */ |
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hdloadbeams(hb, nents, dispbeam); |
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free((char *)hb); |
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} |
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if (op == BS_NEW) { |
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done_packets(flush_queue()); /* empty queue, so we can... */ |
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for (i = 0; i < complen; i++) /* ...get number computed */ |
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complist[i].nc = bnrays(hdlist[complist[i].hd], |
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complist[i].bi); |
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listpos = 0; |
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lastin = -1; /* flag for initial sort */ |
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} |
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return; |
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memerr: |
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} |
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|
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int |
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weightf(hp, x0, x1, x2) /* voxel weighting function */ |
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register HOLO *hp; |
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register int x0, x1, x2; |
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{ |
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switch (vlet(OCCUPANCY)) { |
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case 'U': /* uniform weighting */ |
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return(1); |
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case 'C': /* center weighting (crude) */ |
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x0 += x0 - hp->grid[0] + 1; |
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x0 = abs(x0)*hp->grid[1]*hp->grid[2]; |
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x1 += x1 - hp->grid[1] + 1; |
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x1 = abs(x1)*hp->grid[0]*hp->grid[2]; |
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x2 += x2 - hp->grid[2] + 1; |
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x2 = abs(x2)*hp->grid[0]*hp->grid[1]; |
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return(hp->grid[0]*hp->grid[1]*hp->grid[2] - |
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(x0+x1+x2)/3); |
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default: |
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badvalue(OCCUPANCY); |
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} |
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} |
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|
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|
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/* The following is by Daniel Cohen, taken from Graphics Gems IV, p. 368 */ |
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long |
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lineweight(hp, x, y, z, dx, dy, dz) /* compute weights along a line */ |
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double |
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beamvolume(hp, bi) /* compute approximate volume of a beam */ |
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HOLO *hp; |
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int x, y, z, dx, dy, dz; |
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int bi; |
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{ |
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long wres = 0; |
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int n, sx, sy, sz, exy, exz, ezy, ax, ay, az, bx, by, bz; |
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|
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sx = sgn(dx); sy = sgn(dy); sz = sgn(dz); |
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ax = abs(dx); ay = abs(dy); az = abs(dz); |
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bx = 2*ax; by = 2*ay; bz = 2*az; |
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exy = ay-ax; exz = az-ax; ezy = ay-az; |
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n = ax+ay+az + 1; /* added increment to visit last */ |
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while (n--) { |
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wres += weightf(hp, x, y, z); |
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if (exy < 0) { |
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if (exz < 0) { |
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x += sx; |
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exy += by; exz += bz; |
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} else { |
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z += sz; |
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exz -= bx; ezy += by; |
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} |
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} else { |
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< |
if (ezy < 0) { |
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< |
z += sz; |
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exz -= bx; ezy += by; |
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} else { |
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y += sy; |
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exy -= bx; ezy -= bz; |
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} |
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} |
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GCOORD gc[2]; |
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FVECT cp[4], edgeA, edgeB, cent[2]; |
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FVECT v, crossp[2], diffv; |
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double vol[2]; |
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register int i; |
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/* get grid coordinates */ |
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if (!hdbcoord(gc, hp, bi)) |
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error(CONSISTENCY, "bad beam index in beamvolume"); |
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for (i = 0; i < 2; i++) { /* compute cell area vectors */ |
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hdcell(cp, hp, gc+i); |
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VSUM(edgeA, cp[1], cp[0], -1.0); |
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VSUM(edgeB, cp[3], cp[1], -1.0); |
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fcross(crossp[i], edgeA, edgeB); |
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/* compute center */ |
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cent[i][0] = 0.5*(cp[0][0] + cp[2][0]); |
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cent[i][1] = 0.5*(cp[0][1] + cp[2][1]); |
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cent[i][2] = 0.5*(cp[0][2] + cp[2][2]); |
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} |
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return(wres); |
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> |
/* compute difference vector */ |
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VSUM(diffv, cent[1], cent[0], -1.0); |
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for (i = 0; i < 2; i++) { /* compute volume contributions */ |
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vol[i] = 0.5*DOT(crossp[i], diffv); |
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> |
if (vol[i] < 0.) vol[i] = -vol[i]; |
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} |
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return(vol[0] + vol[1]); /* return total volume */ |
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} |
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init_global() /* initialize global ray computation */ |
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{ |
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long wtotal = 0; |
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int i, j; |
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int lseg[2][3]; |
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double frac; |
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< |
register int k; |
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< |
/* free old list */ |
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< |
if (complen > 0) |
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> |
int i; |
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> |
register int j, k; |
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> |
/* free old list and empty queue */ |
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> |
if (complen > 0) { |
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free((char *)complist); |
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+ |
done_packets(flush_queue()); |
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+ |
} |
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/* allocate beam list */ |
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complen = 0; |
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for (j = 0; hdlist[j] != NULL; j++) |
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error(SYSTEM, "out of memory in init_global"); |
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/* compute beam weights */ |
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k = 0; |
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< |
for (j = 0; hdlist[j] != NULL; j++) |
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for (j = 0; hdlist[j] != NULL; j++) { |
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frac = 512. * hdlist[j]->wg[0] * |
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hdlist[j]->wg[1] * hdlist[j]->wg[2]; |
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if (frac < 0.) frac = -frac; |
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for (i = nbeams(hdlist[j]); i > 0; i--) { |
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hdlseg(lseg, hdlist[j], i); |
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complist[k].hd = j; |
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complist[k].bi = i; |
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complist[k].nr = lineweight( hdlist[j], |
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< |
lseg[0][0], lseg[0][1], lseg[0][2], |
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lseg[1][0] - lseg[0][0], |
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< |
lseg[1][1] - lseg[0][1], |
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< |
lseg[1][2] - lseg[0][2] ); |
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complist[k].nr = frac*beamvolume(hdlist[j], i) + 0.5; |
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> |
complist[k].nc = bnrays(hdlist[j], i); |
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wtotal += complist[k++].nr; |
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} |
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+ |
} |
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/* adjust weights */ |
| 242 |
< |
if (vdef(DISKSPACE)) { |
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> |
if (vdef(DISKSPACE)) |
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frac = 1024.*1024.*vflt(DISKSPACE) / (wtotal*sizeof(RAYVAL)); |
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< |
if (frac < 0.95 | frac > 1.05) |
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< |
while (k--) |
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< |
complist[k].nr = frac * complist[k].nr; |
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< |
} |
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> |
else |
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> |
frac = 1024.*1024.*16384. / (wtotal*sizeof(RAYVAL)); |
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> |
while (k--) |
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> |
complist[k].nr = frac * complist[k].nr; |
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listpos = 0; lastin = -1; /* flag initial sort */ |
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} |
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mergeclists(cdest, cl1, n1, cl2, n2) /* merge two sorted lists */ |
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< |
PACKHEAD *cdest; |
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< |
PACKHEAD *cl1, *cl2; |
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> |
register PACKHEAD *cdest; |
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> |
register PACKHEAD *cl1, *cl2; |
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int n1, n2; |
| 256 |
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{ |
| 257 |
< |
int cmp; |
| 257 |
> |
register int cmp; |
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|
| 259 |
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while (n1 | n2) { |
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if (!n1) cmp = 1; |
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* list and start again from the beginning. Since |
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* a merge sort is used, the sorting costs are minimal. |
| 321 |
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*/ |
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< |
next_packet(p) /* prepare packet for computation */ |
| 322 |
> |
next_packet(p, n) /* prepare packet for computation */ |
| 323 |
|
register PACKET *p; |
| 324 |
+ |
int n; |
| 325 |
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{ |
| 326 |
|
register int i; |
| 327 |
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|
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p->nr = complist[listpos].nr - p->nc; |
| 336 |
|
if (p->nr <= 0) |
| 337 |
|
return(0); |
| 338 |
< |
if (p->nr > RPACKSIZ) |
| 339 |
< |
p->nr = RPACKSIZ; |
| 338 |
> |
#ifdef DEBUG |
| 339 |
> |
if (n < 1 | n > RPACKSIZ) |
| 340 |
> |
error(CONSISTENCY, "next_packet called with bad n value"); |
| 341 |
> |
#endif |
| 342 |
> |
if (p->nr > n) |
| 343 |
> |
p->nr = n; |
| 344 |
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complist[listpos].nc += p->nr; /* find where this one would go */ |
| 345 |
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while (lastin > listpos && |
| 346 |
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beamcmp(complist+lastin, complist+listpos) > 0) |
