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/* Copyright (c) 1988 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* instance.c - routines for octree objects.
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*
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* 11/10/88
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*/
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#include "standard.h"
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#include "object.h"
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#include "instance.h"
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static SCENE *slist = NULL; /* list of loaded octrees */
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SCENE *
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getscene(sname, flags) /* load octree sname */
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char *sname;
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int flags;
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{
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extern char *libpath;
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char *pathname;
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register SCENE *sc;
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flags &= ~IO_FILES; /* not allowed */
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for (sc = slist; sc != NULL; sc = sc->next)
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if (!strcmp(sname, sc->name)) {
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if ((sc->ldflags & flags) == flags)
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return(sc); /* loaded */
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break; /* load the rest */
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}
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if (sc == NULL) {
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sc = (SCENE *)malloc(sizeof(SCENE));
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if (sc == NULL)
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error(SYSTEM, "out of memory in getscene");
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sc->name = savestr(sname);
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sc->ldflags = 0;
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sc->next = slist;
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slist = sc;
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}
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if ((pathname = getpath(sname, libpath)) == NULL) {
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sprintf(errmsg, "cannot find octree file \"%s\"", sname);
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error(USER, errmsg);
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}
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readoct(pathname, flags & ~sc->ldflags, &sc->scube, NULL);
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sc->ldflags |= flags;
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return(sc);
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}
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INSTANCE *
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getinstance(o, flags) /* get instance structure */
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register OBJREC *o;
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int flags;
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{
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register INSTANCE *in;
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if ((in = (INSTANCE *)o->os) == NULL) {
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if ((in = (INSTANCE *)malloc(sizeof(INSTANCE))) == NULL)
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error(SYSTEM, "out of memory in getinstance");
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if (o->oargs.nsargs < 1)
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objerror(o, USER, "bad # of arguments");
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in->f.sca = 1.0;
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setident4(in->f.xfm);
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if (xf(in->f.xfm, &in->f.sca, o->oargs.nsargs-1,
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o->oargs.sarg+1) != o->oargs.nsargs-1)
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objerror(o, USER, "bad transform");
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if (in->f.sca < 0.0)
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in->f.sca = -in->f.sca;
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in->b.sca = 1.0;
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setident4(in->b.xfm);
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invxf(in->b.xfm, &in->b.sca,o->oargs.nsargs-1,o->oargs.sarg+1);
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if (in->b.sca < 0.0)
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in->b.sca = -in->b.sca;
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in->obj = NULL;
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(INSTANCE *)o->os = in;
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}
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if (in->obj == NULL || (in->obj->ldflags & flags) != flags)
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in->obj = getscene(o->oargs.sarg[0], flags);
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return(in);
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}
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