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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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|
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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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/* |
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* Routines for reading instances and converting to OpenGL. |
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*/ |
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|
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#include "radogl.h" |
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#include "octree.h" |
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|
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#define MAXLEVEL 16 /* maximum instance hierarchy level */ |
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|
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typedef struct { |
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int listid; /* our list id */ |
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short localmatl; /* uses local material only */ |
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FVECT cent; /* center of octree cube */ |
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char octfile[256]; /* octree file path */ |
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} OCTINST; /* octree to instantiate */ |
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|
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OBJECT nobjects; /* number of objects loaded so far */ |
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|
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extern int free(); |
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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 loadobj(), octerror(), skiptree(); |
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static OCTINST *getoct(); |
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|
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static char *infn; /* input file name */ |
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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 short otypmap[NUMOTYPE+8]; /* object type map */ |
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|
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static long imhash(mod) char *mod; {return((long)mod);} |
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static LUTAB imtab = {imhash,NULL,NULL,NULL,0,NULL,0}; |
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|
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static LUTAB ottab = LU_SINIT(free,free); |
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|
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|
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o_instance(o) /* convert instance to list call */ |
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register OBJREC *o; |
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{ |
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XF xfs; |
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register OCTINST *ot; |
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/* set up */ |
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if (o->oargs.nsargs < 1) |
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objerror(o, USER, "missing octree"); |
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setmaterial(NULL, NULL, 0); |
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/* put out transform (if any) */ |
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if (o->oargs.nsargs > 1) { |
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if (xf(&xfs, o->oargs.nsargs-1, o->oargs.sarg+1) != |
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o->oargs.nsargs-1) |
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objerror(o, USER, "bad transform"); |
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glPushAttrib(GL_TRANSFORM_BIT); |
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if (xfs.sca < 1.-FTINY | xfs.sca > 1.+FTINY) |
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glEnable(GL_NORMALIZE); |
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glMatrixMode(GL_MODELVIEW); |
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glPushMatrix(); |
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/* matrix order works out to same */ |
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#ifdef SMLFLT |
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glMultMatrixf((GLfloat *)xfs.xfm); |
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#else |
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glMultMatrixd((GLdouble *)xfs.xfm); |
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#endif |
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} |
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ot = getoct(o->oargs.sarg[0]); /* get octree reference */ |
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if (ot->localmatl &= o->os != NULL) /* set material */ |
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setmaterial(o->os, ot->cent, 0); |
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/* call the assigned list */ |
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glCallList(ot->listid); |
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|
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if (o->oargs.nsargs > 1) { /* end transform */ |
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glMatrixMode(GL_MODELVIEW); |
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glPopMatrix(); |
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glPopAttrib(); |
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} |
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rgl_checkerr("creating instance"); |
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} |
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|
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|
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static int |
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buildoctlist(lp) /* build octree list */ |
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LUENT *lp; |
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{ |
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int old_dolights = dolights, old_domats = domats; |
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register OCTINST *op = (OCTINST *)lp->data; |
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|
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domats = !op->localmatl; /* do materials only if needed */ |
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dolights = 0; /* never do light sources */ |
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glNewList(op->listid, GL_COMPILE); |
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loadoct(op->octfile); /* load objects into display list */ |
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surfclean(); /* clean up */ |
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glEndList(); |
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dolights = old_dolights; /* restore */ |
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domats = old_domats; |
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return(1); /* return success */ |
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} |
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|
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|
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int |
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loadoctrees() /* load octrees we've saved up */ |
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{ |
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int levelsleft = MAXLEVEL; |
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int nocts = 0; |
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LUTAB looptab; |
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/* loop through new octree references */ |
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while (ottab.tsiz) { |
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if (!levelsleft--) |
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error(USER, "too many octree levels -- instance loop?"); |
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copystruct(&looptab, &ottab); |
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ottab.tsiz = 0; |
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nocts += lu_doall(&looptab, buildoctlist); |
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lu_done(&looptab); |
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} |
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return(nocts); |
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} |
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|
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|
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static OCTINST * |
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getoct(name) /* get/assign octree list id */ |
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char *name; |
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{ |
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extern char *getpath(), *getlibpath(); |
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char *path; |
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register LUENT *lp; |
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register OCTINST *op; |
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|
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if ((lp = lu_find(&ottab, name)) == NULL) |
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goto memerr; |
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if (lp->key == NULL) { |
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lp->key = (char *)malloc(strlen(name)+1); |
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if (lp->key == NULL) |
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goto memerr; |
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strcpy(lp->key, name); |
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} |
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if ((op = (OCTINST *)lp->data) == NULL) { |
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path = getpath(name, getlibpath(), R_OK); |
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if (path == NULL) { |
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sprintf(errmsg, "cannot find octree \"%s\"", name); |
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error(USER, errmsg); |
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} |
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op = (OCTINST *)(lp->data = (char *)malloc(sizeof(OCTINST))); |
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strcpy(op->octfile, path); |
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checkoct(op->octfile, op->cent); |
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op->listid = newglist(); |
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op->localmatl = ~0; |
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} |
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return(op); |
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memerr: |
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error(SYSTEM, "out of memory in getoct"); |
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} |
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|
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|
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double |
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checkoct(fname, cent) /* check octree file for validity */ |
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char *fname; |
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FVECT cent; |
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{ |
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char sbuf[64]; |
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FILE *fp = infp; |
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char *fn = infn; |
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double siz = 0.; |
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register int i; |
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|
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if ((infp = fopen(infn=fname, "r")) == NULL) { |
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sprintf(errmsg, "cannot open octree file \"%s\"", fname); |
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error(SYSTEM, errmsg); |
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} |
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#ifdef MSDOS |
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setmode(fileno(infp), O_BINARY); |
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#endif |
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/* get header */ |
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if (checkheader(infp, OCTFMT, 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("incompatible octree format"); |
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if (cent != NULL) { /* get boundaries (compute center) */ |
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for (i = 0; i < 3; i++) |
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cent[i] = atof(ogetstr(sbuf)); |
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siz = atof(ogetstr(sbuf))*.5; |
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cent[0] += siz; cent[1] += siz; cent[2] += siz; |
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} else { /* get size (radius) only */ |
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for (i = 0; i < 3; i++) |
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ogetstr(sbuf); |
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siz = atof(ogetstr(sbuf))*.5; |
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} |
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fclose(infp); |
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infp = fp; |
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infn = fn; |
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return(siz); |
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} |
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|
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|
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loadoct(fname) /* read in objects from octree */ |
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char *fname; |
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{ |
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OBJECT fnobjects; |
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char sbuf[256]; |
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int nf; |
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register int i; |
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long m; |
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|
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infn = fname; |
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infp = fopen(fname, "r"); /* assume already checked */ |
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#ifdef MSDOS |
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setmode(fileno(infp), O_BINARY); |
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#endif |
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/* skip header */ |
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getheader(infp, NULL, NULL); |
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/* get format */ |
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objsize = ogetint(2)-OCTMAGIC; |
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/* skip boundaries */ |
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for (i = 0; i < 4; i++) |
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ogetstr(sbuf); |
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nf = 0; /* load object files */ |
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while (*ogetstr(sbuf)) { |
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rgl_load(sbuf); |
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nf++; |
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} |
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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 (nf == 0) { |
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skiptree(); |
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for (i = 0; *ogetstr(sbuf); i++) |
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if ((otypmap[i] = otype(sbuf)) < 0) { |
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sprintf(errmsg, "unknown type \"%s\"", sbuf); |
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octerror(WARNING, errmsg); |
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} |
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lu_init(&imtab, 1000); nobjects = 0; |
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while (loadobj() != OVOID) |
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; |
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lu_done(&imtab); |
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if (nobjects != fnobjects) |
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octerror(USER, "inconsistent object count"); |
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} |
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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 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 |
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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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loadobj() /* get next object */ |
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{ |
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static OBJREC ob; |
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char idbuf[MAXSTR], sbuf[MAXSTR]; |
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register LUENT *lep; |
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register int i; |
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register long m; |
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/* get type */ |
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i = ogetint(1); |
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if (i == -1) |
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return(OVOID); /* terminator */ |
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if ((ob.otype = otypmap[i]) < 0) |
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octerror(USER, "reference to unknown type"); |
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/* get modifier */ |
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if ((m = ogetint(objsize)) != OVOID && (OBJECT)m != m) |
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octerror(USER, "too many objects"); |
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if ((ob.omod = m) != OVOID && domats) { |
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if ((lep = lu_find(&imtab, (char *)m)) == NULL) |
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goto memerr; |
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ob.os = lep->data; |
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} else |
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ob.os = NULL; |
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/* get name id */ |
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ob.oname = ogetstr(idbuf); |
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/* get string arguments */ |
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if (ob.oargs.nsargs = ogetint(2)) { |
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ob.oargs.sarg = (char **)malloc |
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(ob.oargs.nsargs*sizeof(char *)); |
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if (ob.oargs.sarg == NULL) |
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goto memerr; |
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for (i = 0; i < ob.oargs.nsargs; i++) |
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ob.oargs.sarg[i] = savestr(ogetstr(sbuf)); |
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} else |
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ob.oargs.sarg = NULL; |
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/* get integer arguments */ |
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#ifdef IARGS |
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if (ob.oargs.niargs = ogetint(2)) { |
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ob.oargs.iarg = (long *)malloc |
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(ob.oargs.niargs*sizeof(long)); |
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if (ob.oargs.iarg == NULL) |
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goto memerr; |
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for (i = 0; i < ob.oargs.niargs; i++) |
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ob.oargs.iarg[i] = ogetint(4); |
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} else |
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ob.oargs.iarg = NULL; |
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#endif |
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/* get real arguments */ |
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if (ob.oargs.nfargs = ogetint(2)) { |
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ob.oargs.farg = (FLOAT *)malloc |
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(ob.oargs.nfargs*sizeof(FLOAT)); |
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if (ob.oargs.farg == NULL) |
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goto memerr; |
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for (i = 0; i < ob.oargs.nfargs; i++) |
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ob.oargs.farg[i] = ogetflt(); |
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} else |
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ob.oargs.farg = NULL; |
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/* process object */ |
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(*ofun[ob.otype].funp)(&ob); |
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/* record material if modifier */ |
| 374 |
if (ismodifier(ob.otype)) { |
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if ((lep = lu_find(&imtab, (char *)nobjects)) == NULL) |
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goto memerr; |
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lep->key = (char *)nobjects; |
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lep->data = (char *)getmatp(ob.oname); |
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} |
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freefargs(&ob.oargs); /* free arguments */ |
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return(nobjects++); /* return object id */ |
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memerr: |
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error(SYSTEM, "out of memory in loadobj"); |
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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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} |
