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rhcopy.c

#ifndef lint
static const char RCSid[] = "$Id: rhcopy.c,v 3.23 2004/01/02 11:42:01 schorsch Exp $";
#endif
/*
 * Copy data into a holodeck file
 */

#include "platform.h"
#include "rterror.h"
#include "holo.h"
#include "view.h"

#ifndef BKBSIZE
#define BKBSIZE         256         /* beam clump size (kilobytes) */
#endif

int   checkdepth = 1;         /* check depth (!-d option)? */
int   checkrepeats = 0; /* check for repeats (-u option)? */
int   frompicz;         /* input from pictures & depth-buffers? */
int   noutsects;        /* number of output sections */
char  obstr, unobstr;         /* flag pointer values */

char  *progname;        /* global argv[0] */

struct phead {
      VIEW  vw;
      double      expos;
      short gotview;
      short badfmt;
      short altprims;
};
static int openholo(char *fname, int append);
static void addray(FVECT ro, FVECT rd, double d, COLR cv);
static gethfunc holheadline;
static int bpcmp(const void *b1p, const void *b2p);
static int addclump(HOLO *hp, int *bq, int nb);
static void addholo(char *hdf);
static gethfunc picheadline;
static void addpicz(char *pcf, char *zbf);



int
main(
      int   argc,
      char  *argv[]
)
{
      int   i;

      progname = argv[0];
      frompicz = -1;
      for (i = 2; i < argc && argv[i][0] == '-'; i++)
            switch (argv[i][1]) {
            case 'u':
                  checkrepeats = 1;
                  break;
            case 'd':
                  checkdepth = 0;
                  break;
            case 'h':
                  frompicz = 0;
                  break;
            case 'p':
                  frompicz = 1;
                  break;
            default:
                  goto userr;
            }
      if (i >= argc || frompicz < 0)
            goto userr;
      if (frompicz && (argc-i)%2)
            goto userr;
      noutsects = openholo(argv[1], 1);
      if (frompicz) {
            for ( ; i < argc; i += 2)
                  addpicz(argv[i], argv[i+1]);
      } else {
            if (BKBSIZE*1024*1.5 > hdcachesize)
                  hdcachesize = BKBSIZE*1024*1.5;
            for ( ; i < argc; i++)
                  addholo(argv[i]);
      }
      quit(0);
userr:
      fprintf(stderr, "Usage: %s output.hdk [-u][-d] -h inp1.hdk ..\n",
                  progname);
      fprintf(stderr, "   Or: %s output.hdk [-u][-d] -p inp1.pic inp1.zbf ..\n",
                  progname);
      exit(1);
}


#define H_BADF    01
#define H_OBST    02
#define H_OBSF    04

static int
holheadline(            /* check holodeck header line */
      register char     *s,
      void  *vhf
)
{
      char  fmt[32];
      int   *hf = vhf;

      if (formatval(fmt, s)) {
            if (strcmp(fmt, HOLOFMT))
                  *hf |= H_BADF;
            else
                  *hf &= ~H_BADF;
            return(0);
      }
      if (!strncmp(s, "OBSTRUCTIONS=", 13)) {
            s += 13;
            while (*s == ' ') s++;
            if ((*s == 't') | (*s == 'T'))
                  *hf |= H_OBST;
            else if ((*s == 'f') | (*s == 'F'))
                  *hf |= H_OBSF;
            else
                  error(WARNING, "bad OBSTRUCTIONS value in holodeck");
            return(0);
      }
      return(0);
}

int
openholo(         /* open existing holodeck file for i/o */
      char  *fname,
      int   append
)
{
      FILE  *fp;
      int   fd;
      int   hflags = 0;
      long  nextloc;
      int   n;
                              /* open holodeck file */
      if ((fp = fopen(fname, append ? "r+" : "r")) == NULL) {
            sprintf(errmsg, "cannot open \"%s\" for %s", fname,
                        append ? "appending" : "reading");
            error(SYSTEM, errmsg);
      }
                              /* check header and magic number */
      if (getheader(fp, holheadline, &hflags) < 0 ||
                  hflags&H_BADF || getw(fp) != HOLOMAGIC) {
            sprintf(errmsg, "file \"%s\" not in holodeck format", fname);
            error(USER, errmsg);
      }
      fd = dup(fileno(fp));               /* dup file handle */
      nextloc = ftell(fp);                /* get stdio position */
      fclose(fp);                   /* done with stdio */
      for (n = 0; nextloc > 0L; n++) {    /* initialize each section */
            lseek(fd, (off_t)nextloc, SEEK_SET);
            read(fd, (char *)&nextloc, sizeof(nextloc));
            hdinit(fd, NULL)->priv = hflags&H_OBST ? &obstr :
                        hflags&H_OBSF ? &unobstr : (char *)NULL;
      }
      return(n);
}

#undef H_BADF
#undef H_OBST
#undef H_OBSF


void
addray(           /* add a ray to our output holodeck */
      FVECT ro,
      FVECT rd,
      double      d,
      COLR  cv
)
{
      int   sn, bi, n;
      register HOLO     *hp;
      GCOORD      gc[2];
      BYTE  rr[2][2];
      BEAM  *bp;
      double      d0, d1;
      unsigned    dc;
      register RAYVAL   *rv;
                        /* check each output section */
      for (sn = noutsects; sn--; ) {
            hp = hdlist[sn];
            d0 = hdinter(gc, rr, &d1, hp, ro, rd);
            if (d <= d0 || d1 < -0.001)
                  continue;   /* missed section */
            if (checkdepth) {       /* check depth */
                  if (hp->priv == &obstr && d0 < -0.001)
                        continue;   /* ray starts too late */
                  if (hp->priv == &unobstr && d < 0.999*d1)
                        continue;   /* ray ends too soon */
            }
            dc = hdcode(hp, d-d0);
            bi = hdbindex(hp, gc);        /* check for duplicates */
            if (checkrepeats && (bp = hdgetbeam(hp, bi)) != NULL) {
                  for (n = bp->nrm, rv = hdbray(bp); n--; rv++)
                        if ((hp->priv != NULL || rv->d == dc) &&
                                    rv->r[0][0] == rr[0][0] &&
                                    rv->r[0][1] == rr[0][1] &&
                                    rv->r[1][0] == rr[1][0] &&
                                    rv->r[1][1] == rr[1][1])
                              break;
                  if (n >= 0)
                        continue;   /* found a matching ray */
            }
            rv = hdnewrays(hp, bi, 1);
            rv->d = dc;
            rv->r[0][0] = rr[0][0]; rv->r[0][1] = rr[0][1];
            rv->r[1][0] = rr[1][0]; rv->r[1][1] = rr[1][1];
            copycolr(rv->v, cv);
      }
}


static BEAMI      *beamdir;

static int
bpcmp(                  /* compare beam positions on disk */
      const void  *b1p,
      const void  *b2p
)
{
      register off_t    pdif = beamdir[*(int*)b1p].fo - beamdir[*(int*)b2p].fo;

      if (pdif > 0L) return(1);
      if (pdif < 0L) return(-1);
      return(0);
}

static int
addclump(         /* transfer the given clump and free */
      HOLO  *hp,
      int   *bq,
      int   nb
)
{
      GCOORD      gc[2];
      FVECT ro, rd;
      double      d;
      int   i;
      register int      k;
      register BEAM     *bp;
                              /* sort based on file position */
      beamdir = hp->bi;
      qsort((char *)bq, nb, sizeof(*bq), bpcmp);
                              /* transfer each beam */
      for (i = 0; i < nb; i++) {
            bp = hdgetbeam(hp, bq[i]);
            hdbcoord(gc, hp, bq[i]);
                                    /* add each ray to output */
            for (k = bp->nrm; k--; ) {
                  d = hdray(ro, rd, hp, gc, hdbray(bp)[k].r);
                  if (hp->priv == &unobstr)
                        VSUM(ro, ro, rd, d);
                  else
                        d = 0.;
                  d = hddepth(hp, hdbray(bp)[k].d) - d;
                  addray(ro, rd, d, hdbray(bp)[k].v);
            }
            hdfreebeam(hp, bq[i]);        /* free the beam */
      }
      return(0);
}


void
addholo(                /* add a holodeck file */
      char  *hdf
)
{
      int   fd;
                              /* open the holodeck for reading */
      openholo(hdf, 0);
      fd = hdlist[noutsects]->fd;   /* remember the file handle */
      while (hdlist[noutsects] != NULL) { /* load each section */
                                          /* clump the beams */
            clumpbeams(hdlist[noutsects], 0, BKBSIZE*1024, addclump);
            hddone(hdlist[noutsects]);          /* free the section */
      }
      close(fd);              /* close input file */
      hdflush(NULL);                /* flush output */
}



static int
picheadline(            /* process picture header line */
      char  *s,
      void  *vph
)
{
      char  fmt[32];
      struct phead *ph = vph;

      if (formatval(fmt, s)) {
            ph->badfmt = strcmp(fmt, COLRFMT);
            return(0);
      }
      if (isprims(s)) {
            ph->altprims++;         /* don't want to deal with this */
            return(0);
      }
      if (isexpos(s)) {
            ph->expos *= exposval(s);
            return(0);
      }
      if (isview(s)) {
            ph->gotview += sscanview(&ph->vw, s);
            return(0);
      }
      return(0);
}


void
addpicz(          /* add a picture + depth-buffer */
      char  *pcf,
      char  *zbf
)
{
      FILE  *pfp;
      int   zfd;
      COLR  *cscn;
      float *zscn;
      struct phead      phd;
      int   eshft;
      double      emult;
      RESOLU      prs;
      RREAL vl[2];
      FVECT ro, rd;
      double      aftd;
      COLOR ctmp;
      int   j;
      register int      i;
                        /* open files */
      if ((pfp = fopen(pcf, "r")) == NULL) {
            sprintf(errmsg, "cannot open picture file \"%s\"", pcf);
            error(SYSTEM, pcf);
      }
      if ((zfd = open(zbf, O_RDONLY)) < 0) {
            sprintf(errmsg, "cannot open depth file \"%s\"", zbf);
            error(SYSTEM, pcf);
      }
                        /* load picture header */
      phd.vw = stdview;
      phd.expos = 1.0;
      phd.badfmt = phd.gotview = phd.altprims = 0;
      if (getheader(pfp, picheadline, &phd) < 0 ||
                  phd.badfmt || !fgetsresolu(&prs, pfp)) {
            sprintf(errmsg, "bad format for picture file \"%s\"", pcf);
            error(USER, errmsg);
      }
      if (!phd.gotview || setview(&phd.vw) != NULL) {
            sprintf(errmsg, "missing/illegal view in picture \"%s\"",
                        pcf);
            error(USER, errmsg);
      }
      if (phd.altprims) {
            sprintf(errmsg, "ignoring primary values in picture \"%s\"",
                        pcf);
            error(WARNING, errmsg);
      }
                        /* figure out what to do about exposure */
      if ((phd.expos < 0.99) | (phd.expos > 1.01)) {
            emult = -log(phd.expos)/log(2.);
            eshft = emult >= 0. ? emult+.5 : emult-.5;
            emult -= (double)eshft;
            if ((emult <= 0.01) & (emult >= -0.01))
                  emult = -1.;
            else {
                  emult = 1./phd.expos;
                  eshft = 0;
            }
      } else {
            emult = -1.;
            eshft = 0;
      }
                        /* allocate buffers */
      cscn = (COLR *)malloc(scanlen(&prs)*sizeof(COLR));
      zscn = (float *)malloc(scanlen(&prs)*sizeof(float));
      if ((cscn == NULL) | (zscn == NULL))
            error(SYSTEM, "out of memory in addpicz");
                        /* read and process each scanline */
      for (j = 0; j < numscans(&prs); j++) {
            i = scanlen(&prs);                  /* read colrs */
            if (freadcolrs(cscn, i, pfp) < 0) {
                  sprintf(errmsg, "error reading picture \"%s\"", pcf);
                  error(USER, errmsg);
            }
            if (eshft)                    /* shift exposure */
                  shiftcolrs(cscn, i, eshft);
            i *= sizeof(float);                 /* read depth */
            if (read(zfd, (char *)zscn, i) != i) {
                  sprintf(errmsg, "error reading depth file \"%s\"", zbf);
                  error(USER, errmsg);
            }
            for (i = scanlen(&prs); i--; ) {    /* do each pixel */
                  pix2loc(vl, &prs, i, j);
                  aftd = viewray(ro, rd, &phd.vw, vl[0], vl[1]);
                  if (aftd < -FTINY)
                        continue;         /* off view */
                  if (aftd > FTINY && zscn[i] > aftd)
                        continue;         /* aft clipped */
                  if (emult > 0.) {       /* whatta pain */
                        colr_color(ctmp, cscn[i]);
                        scalecolor(ctmp, emult);
                        setcolr(cscn[i], colval(ctmp,RED),
                              colval(ctmp,GRN), colval(ctmp,BLU));
                  }
                  addray(ro, rd, (double)zscn[i], cscn[i]);
            }
      }
                        /* write output and free beams */
      hdflush(NULL);
                        /* clean up */
      free((void *)cscn);
      free((void *)zscn);
      fclose(pfp);
      close(zfd);
}


void
eputs(                  /* put error message to stderr */
      register char  *s
)
{
      static int  midline = 0;

      if (!*s)
            return;
      if (!midline++) { /* prepend line with program name */
            fputs(progname, stderr);
            fputs(": ", stderr);
      }
      fputs(s, stderr);
      if (s[strlen(s)-1] == '\n') {
            fflush(stderr);
            midline = 0;
      }
}


void
quit(             /* exit the program gracefully */
      int   code
)
{
      hdsync(NULL, 1);  /* write out any buffered data */
      exit(code);
}

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