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gwlarson |
3.1 |
/* 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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#endif |
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/* |
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* Bundle holodeck beams together into clumps. |
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*/ |
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#include "holo.h" |
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#define flgop(p,i,op) ((p)[(i)>>5] op (1L<<((i)&0x1f))) |
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#define isset(p,i) flgop(p,i,&) |
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#define setfl(p,i) flgop(p,i,|=) |
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#define clrfl(p,i) flgop(p,i,&=~) |
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static int bneighlist[9*9-1]; |
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static int bneighrem; |
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#define nextneigh() (bneighrem<=0 ? 0 : bneighlist[--bneighrem]) |
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gcshifti(gc, ia, di, hp) /* shift cell row or column */ |
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register GCOORD *gc; |
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int ia, di; |
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register HOLO *hp; |
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{ |
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int nw; |
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if (di > 0) { |
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if (++gc->i[ia] >= hp->grid[((gc->w>>1)+1+ia)%3]) { |
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nw = ((gc->w&~1) + (ia<<1) + 3) % 6; |
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gc->i[ia] = gc->i[1-ia]; |
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gc->i[1-ia] = gc->w&1 ? hp->grid[((nw>>1)+2-ia)%3]-1 : 0; |
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gc->w = nw; |
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} |
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} else if (di < 0) { |
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if (--gc->i[ia] < 0) { |
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nw = ((gc->w&~1) + (ia<<1) + 2) % 6; |
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gc->i[ia] = gc->i[1-ia]; |
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gc->i[1-ia] = gc->w&1 ? hp->grid[((nw>>1)+2-ia)%3]-1 : 0; |
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gc->w = nw; |
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} |
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} |
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} |
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mkneighgrid(ng, hp, gc) /* compute neighborhood for grid cell */ |
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GCOORD ng[3*3]; |
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HOLO *hp; |
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GCOORD *gc; |
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{ |
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GCOORD gci0; |
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register int i, j; |
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for (i = 3; i--; ) { |
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copystruct(&gci0, gc); |
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gcshifti(&gci0, 0, i-1, hp); |
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for (j = 3; j--; ) { |
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copystruct(ng+(3*i+j), &gci0); |
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gcshifti(ng+(3*i+j), gci0.w==gc->w, j-1, hp); |
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} |
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} |
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} |
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static int |
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firstneigh(hp, b) /* initialize neighbor list and return first */ |
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HOLO *hp; |
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int b; |
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{ |
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GCOORD wg0[9], wg1[9], bgc[2]; |
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int i, j; |
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hdbcoord(bgc, hp, b); |
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mkneighgrid(wg0, hp, bgc); |
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mkneighgrid(wg1, hp, bgc+1); |
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bneighrem = 0; |
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for (i = 9; i--; ) |
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for (j = 9; j--; ) { |
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if (i == 4 & j == 4) /* don't copy starting beam */ |
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continue; |
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if (wg0[i].w == wg1[j].w) |
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continue; |
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copystruct(bgc, wg0+i); |
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copystruct(bgc+1, wg1+j); |
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bneighlist[bneighrem++] = hdbindex(hp, bgc); |
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#ifdef DEBUG |
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if (bneighlist[bneighrem-1] <= 0) |
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error(CONSISTENCY, "bad beam in firstneigh"); |
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#endif |
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} |
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return(nextneigh()); |
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} |
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gwlarson |
3.2 |
clumpbeams(hp, maxcnt, maxsiz, cf) /* clump beams from hinp */ |
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gwlarson |
3.1 |
register HOLO *hp; |
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int maxcnt, maxsiz; |
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gwlarson |
3.2 |
int (*cf)(); |
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gwlarson |
3.1 |
{ |
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static short primes[] = {9431,6803,4177,2659,1609,887,587,251,47,1}; |
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unsigned int4 *bflags; |
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int *bqueue; |
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int bqlen; |
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int4 bqtotal; |
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int bc, bci, bqc, myprime; |
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register int i; |
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/* get clump size */ |
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if (maxcnt <= 1) |
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maxcnt = nbeams(hp); |
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maxsiz /= sizeof(RAYVAL); |
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/* allocate beam queue */ |
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bqueue = (int *)malloc(maxcnt*sizeof(int)); |
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bflags = (unsigned int4 *)calloc((nbeams(hp)>>5)+1, |
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sizeof(unsigned int4)); |
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if (bqueue == NULL | bflags == NULL) |
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error(SYSTEM, "out of memory in clumpbeams"); |
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/* mark empty beams as done */ |
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for (i = nbeams(hp); i > 0; i--) |
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if (!bnrays(hp, i)) |
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setfl(bflags, i); |
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/* pick a good prime step size */ |
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for (i = 0; primes[i]<<5 >= nbeams(hp); i++) |
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; |
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while ((myprime = primes[i++]) > 1) |
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if (nbeams(hp) % myprime) |
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break; |
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/* add each input beam and neighbors */ |
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for (bc = bci = nbeams(hp); bc > 0; bc--, |
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bci += bci>myprime ? -myprime : nbeams(hp)-myprime) { |
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if (isset(bflags, bci)) |
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continue; |
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bqueue[0] = bci; /* initialize queue */ |
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bqlen = 1; |
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bqtotal = bnrays(hp, i); |
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setfl(bflags, bci); |
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/* run through growing queue */ |
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for (bqc = 0; bqc < bqlen; bqc++) { |
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/* add neighbors until full */ |
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for (i = firstneigh(hp,bqueue[bqc]); i > 0; |
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i = nextneigh()) { |
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if (isset(bflags, i)) /* done already? */ |
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continue; |
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bqueue[bqlen++] = i; /* add it */ |
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bqtotal += bnrays(hp, i); |
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setfl(bflags, i); |
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if (bqlen >= maxcnt || |
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(maxsiz && bqtotal >= maxsiz)) |
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break; /* queue full */ |
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} |
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if (i > 0) |
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break; |
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} |
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gwlarson |
3.2 |
(*cf)(hp, bqueue, bqlen); /* transfer clump */ |
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gwlarson |
3.1 |
} |
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gwlarson |
3.2 |
/* all done; clean up */ |
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gwlarson |
3.1 |
free((char *)bqueue); |
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free((char *)bflags); |
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} |
