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#ifndef lint |
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static const char RCSid[] = "$Id: readoct.c,v 2.15 2003/03/14 21:27:46 greg Exp $"; |
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#endif |
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/* |
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* readoct.c - routines to read octree information. |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "standard.h" |
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|
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#include "octree.h" |
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|
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#include "object.h" |
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|
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#include "otypes.h" |
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|
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static double ogetflt(); |
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static long ogetint(); |
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static char *ogetstr(); |
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static int nonsurfinset(); |
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static int octerror(), skiptree(); |
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static OCTREE getfullnode(), gettree(); |
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|
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static char *infn; /* input file specification */ |
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static FILE *infp; /* input file stream */ |
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static int objsize; /* size of stored OBJECT's */ |
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static OBJECT objorig; /* zeroeth object */ |
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static OBJECT fnobjects; /* number of objects in this file */ |
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|
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|
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int |
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readoct(inpspec, load, scene, ofn) /* read in octree file or stream */ |
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char *inpspec; |
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int load; |
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CUBE *scene; |
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char *ofn[]; |
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{ |
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char sbuf[512]; |
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int nf; |
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int i; |
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long m; |
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|
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if (inpspec == NULL) { |
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infn = "standard input"; |
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infp = stdin; |
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} else if (inpspec[0] == '!') { |
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infn = inpspec; |
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if ((infp = popen(inpspec+1, "r")) == NULL) { |
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sprintf(errmsg, "cannot execute \"%s\"", inpspec); |
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error(SYSTEM, errmsg); |
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} |
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} else { |
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infn = inpspec; |
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if ((infp = fopen(inpspec, "r")) == NULL) { |
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sprintf(errmsg, "cannot open octree file \"%s\"", |
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inpspec); |
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error(SYSTEM, errmsg); |
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} |
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} |
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SET_FILE_BINARY(infp); |
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/* get header */ |
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if (checkheader(infp, OCTFMT, load&IO_INFO ? stdout : (FILE *)NULL) < 0) |
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octerror(USER, "not an octree"); |
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/* check format */ |
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if ((objsize = ogetint(2)-OCTMAGIC) <= 0 || |
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objsize > MAXOBJSIZ || objsize > sizeof(long)) |
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octerror(USER, "incompatible octree format"); |
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/* get boundaries */ |
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if (load & IO_BOUNDS) { |
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for (i = 0; i < 3; i++) |
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scene->cuorg[i] = atof(ogetstr(sbuf)); |
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scene->cusize = atof(ogetstr(sbuf)); |
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} else { |
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for (i = 0; i < 4; i++) |
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ogetstr(sbuf); |
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} |
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objorig = nobjects; /* set object offset */ |
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nf = 0; /* get object files */ |
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while (*ogetstr(sbuf)) { |
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if (load & IO_SCENE) |
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readobj(sbuf); |
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if (load & IO_FILES) |
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ofn[nf] = savqstr(sbuf); |
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nf++; |
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} |
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if (load & IO_FILES) |
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ofn[nf] = NULL; |
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/* get number of objects */ |
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fnobjects = m = ogetint(objsize); |
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if (fnobjects != m) |
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octerror(USER, "too many objects"); |
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|
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if (load & IO_TREE) /* get the octree */ |
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scene->cutree = gettree(); |
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else if (load & IO_SCENE && nf == 0) |
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skiptree(); |
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|
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if (load & IO_SCENE) /* get the scene */ |
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if (nf == 0) { |
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/* load binary scene data */ |
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readscene(infp, objsize); |
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|
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} else { /* consistency checks */ |
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/* check object count */ |
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if (nobjects != objorig+fnobjects) |
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octerror(USER, "bad object count; octree stale?"); |
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/* check for non-surfaces */ |
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if (dosets(nonsurfinset)) |
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octerror(USER, "modifier in tree; octree stale?"); |
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} |
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/* close the input */ |
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if (infn[0] == '!') |
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pclose(infp); |
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else |
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fclose(infp); |
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return(nf); |
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} |
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|
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|
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static char * |
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ogetstr(s) /* get null-terminated string */ |
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char *s; |
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{ |
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extern char *getstr(); |
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|
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if (getstr(s, infp) == NULL) |
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octerror(USER, "truncated octree"); |
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return(s); |
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} |
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|
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|
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static OCTREE |
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getfullnode() /* get a set, return fullnode */ |
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{ |
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OBJECT set[MAXSET+1]; |
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register int i; |
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register long m; |
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|
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if ((set[0] = ogetint(objsize)) > MAXSET) |
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octerror(USER, "bad set in getfullnode"); |
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for (i = 1; i <= set[0]; i++) { |
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m = ogetint(objsize) + objorig; |
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if ((set[i] = m) != m) |
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octerror(USER, "too many objects"); |
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} |
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return(fullnode(set)); |
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} |
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|
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|
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static long |
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ogetint(siz) /* get a siz-byte integer */ |
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int siz; |
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{ |
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extern long getint(); |
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register long r; |
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|
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r = getint(siz, infp); |
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if (feof(infp)) |
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octerror(USER, "truncated octree"); |
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return(r); |
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} |
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|
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|
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static double |
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ogetflt() /* get a floating point number */ |
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{ |
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extern double getflt(); |
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double r; |
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|
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r = getflt(infp); |
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if (feof(infp)) |
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octerror(USER, "truncated octree"); |
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return(r); |
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} |
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|
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|
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static OCTREE |
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gettree() /* get a pre-ordered octree */ |
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{ |
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register OCTREE ot; |
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register int i; |
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|
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switch (getc(infp)) { |
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case OT_EMPTY: |
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return(EMPTY); |
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case OT_FULL: |
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return(getfullnode()); |
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case OT_TREE: |
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if ((ot = octalloc()) == EMPTY) |
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octerror(SYSTEM, "out of tree space in gettree"); |
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for (i = 0; i < 8; i++) |
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octkid(ot, i) = gettree(); |
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return(ot); |
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case EOF: |
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octerror(USER, "truncated octree"); |
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default: |
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octerror(USER, "damaged octree"); |
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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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nonsurfinset(os) /* check set for modifier */ |
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register OBJECT *os; |
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{ |
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register OBJECT s; |
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register int i; |
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|
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for (i = *os; i-- > 0; ) |
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if ((s = *++os) >= objorig && s < objorig+fnobjects && |
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ismodifier(objptr(s)->otype)) |
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return(1); |
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return(0); |
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} |
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|
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|
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static |
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skiptree() /* skip octree on input */ |
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{ |
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register int i; |
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|
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switch (getc(infp)) { |
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case OT_EMPTY: |
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return; |
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case OT_FULL: |
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for (i = ogetint(objsize)*objsize; i-- > 0; ) |
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if (getc(infp) == EOF) |
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octerror(USER, "truncated octree"); |
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return; |
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case OT_TREE: |
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for (i = 0; i < 8; i++) |
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skiptree(); |
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return; |
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case EOF: |
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octerror(USER, "truncated octree"); |
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default: |
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octerror(USER, "damaged octree"); |
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} |
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} |
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|
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|
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static |
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octerror(etyp, msg) /* octree error */ |
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int etyp; |
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char *msg; |
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{ |
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char msgbuf[128]; |
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|
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sprintf(msgbuf, "(%s): %s", infn, msg); |
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error(etyp, msgbuf); |
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} |
