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gwlarson |
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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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#endif |
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/* |
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* Get general information on holodeck file |
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*/ |
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#include "holo.h" |
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#ifndef NHBINS |
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#define NHBINS 12 /* number of histogram bins to use for stats */ |
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#endif |
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char *progname; /* global argv[0] */ |
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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int sect; |
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progname = argv[0]; |
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if (argc != 2) |
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goto userr; |
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gethdinfo(argv[1], stdout); |
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quit(0); |
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userr: |
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fprintf(stderr, "Usage: %s input.hdk\n", progname); |
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exit(1); |
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} |
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gethdinfo(fname, fout) /* get information on holodeck */ |
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char *fname; |
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FILE *fout; |
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{ |
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extern long ftell(); |
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FILE *fp; |
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HOLO *hdsect; |
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int fd; |
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int4 nextloc; |
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int n; |
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/* open holodeck file */ |
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if ((fp = fopen(fname, "r")) == NULL) { |
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sprintf(errmsg, "cannot open \"%s\"", fname); |
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error(SYSTEM, errmsg); |
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} |
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/* check header and magic number */ |
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if (checkheader(fp, HOLOFMT, fout) < 0 || getw(fp) != HOLOMAGIC) { |
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sprintf(errmsg, "file \"%s\" not in holodeck format", fname); |
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error(USER, errmsg); |
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} |
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fd = dup(fileno(fp)); /* dup file handle */ |
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nextloc = ftell(fp); /* get stdio position */ |
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fclose(fp); /* done with stdio */ |
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for (n = 0; nextloc > 0L; n++) { /* get the section(s) */ |
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lseek(fd, (long)nextloc, 0); |
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read(fd, (char *)&nextloc, sizeof(nextloc)); |
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hdsect = hdinit(fd, NULL); /* load section directory */ |
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fprintf(fout,"Section %d:\n",n); |
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psectstats(hdsect, fout); /* print section statistics */ |
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} |
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nextloc = hdfilen(fd); /* print global statistics */ |
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fprintf(fout, "%.1f Mbyte file, %.1f%% fragmentation\n", |
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nextloc/(1024.*1024.), |
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100.*(nextloc-hdfiluse(fd,1))/nextloc); |
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/* don't bother with cleanup */ |
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#if 0 |
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hddone(NULL); /* free sections */ |
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close(fd); /* done with the holodeck */ |
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#endif |
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} |
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psectstats(hp, fp) /* print statistical information for section */ |
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register HOLO *hp; |
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FILE *fp; |
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{ |
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int scount[NHBINS]; |
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int minsamp = 10000, maxsamp = 0; |
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double sqrtmaxp; |
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int bmin, bmax, cnt; |
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register int i; |
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fprintf(fp, "\tGrid resolution: %d x %d x %d\n", |
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hp->grid[0], hp->grid[1], hp->grid[2]); |
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fprintf(fp, "\tNumber of beams: %d\n", nbeams(hp)); |
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fprintf(fp, "\tNumber of ray samples: %d\n", biglob(hp)->nrd); |
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if (biglob(hp)->nrd <= 0) |
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return; /* no samples to stat! */ |
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for (i = nbeams(hp); i > 0; i--) { |
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if (hp->bi[i].nrd < minsamp) |
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minsamp = hp->bi[i].nrd; |
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if (hp->bi[i].nrd > maxsamp) |
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maxsamp = hp->bi[i].nrd; |
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} |
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sqrtmaxp = sqrt(maxsamp+1.0); |
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for (i = NHBINS; i--; ) |
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scount[i] = 0; |
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for (i = nbeams(hp); i > 0; i--) |
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scount[(int)(NHBINS*sqrt((double)hp->bi[i].nrd)/sqrtmaxp)]++; |
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for (cnt = 0, i = 0; i < NHBINS && cnt<<1 < nbeams(hp); i++) |
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cnt += scount[i]; |
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fprintf(fp, "\tSamples per beam: [min,med,max]= [%d,%.0f,%d]\n", |
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minsamp, |
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(i-.5)*(i-.5)*(maxsamp+1)/(NHBINS*NHBINS), |
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maxsamp); |
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fprintf(fp, "\tHistogram: [minsamp,maxsamp)= #beams\n"); |
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bmax = 0; |
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for (i = 0; i < NHBINS; i++) { |
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bmin = bmax; |
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bmax = (i+1)*(i+1)*(maxsamp+1)/(NHBINS*NHBINS); |
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fprintf(fp, "\t\t[%d,%d)= %d\n", bmin, bmax, scount[i]); |
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} |
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} |
