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#ifndef lint
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static const char RCSid[] = "$Id: instance.c,v 2.12 2016/03/22 03:56:17 greg Exp $";
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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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#include "copyright.h"
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#include "rtmath.h"
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#include "rterror.h"
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#include "rtio.h"
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#include "paths.h"
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#include "octree.h"
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#include "object.h"
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#include "instance.h"
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#define IO_ILLEGAL (IO_FILES|IO_INFO)
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static SCENE *slist = NULL; /* list of loaded octrees */
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SCENE *
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getscene( /* get new octree reference */
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char *sname,
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int flags
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)
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{
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char *pathname;
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SCENE *sc;
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flags &= ~IO_ILLEGAL; /* 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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break;
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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->nref = 0;
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sc->ldflags = 0;
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sc->scube.cutree = EMPTY;
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sc->scube.cuorg[0] = sc->scube.cuorg[1] =
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sc->scube.cuorg[2] = 0.;
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sc->scube.cusize = 0.;
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sc->firstobj = sc->nobjs = 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, getrlibpath(), R_OK)) == NULL) {
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sprintf(errmsg, "cannot find octree file \"%s\"", sname);
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error(SYSTEM, errmsg);
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}
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flags &= ~sc->ldflags; /* skip what's already loaded */
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if (flags & IO_SCENE)
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sc->firstobj = nobjects;
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if (flags)
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readoct(pathname, flags, &sc->scube, NULL);
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if (flags & IO_SCENE)
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sc->nobjs = nobjects - sc->firstobj;
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sc->ldflags |= flags;
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sc->nref++; /* increase reference count */
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return(sc);
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}
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INSTANCE *
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getinstance( /* get instance structure */
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OBJREC *o,
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int flags
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)
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{
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INSTANCE *ins;
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flags &= ~IO_ILLEGAL; /* not allowed */
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if ((ins = (INSTANCE *)o->os) == NULL) {
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if ((ins = (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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if (fullxf(&ins->x, 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 (ins->x.f.sca < 0.0) {
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ins->x.f.sca = -ins->x.f.sca;
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ins->x.b.sca = -ins->x.b.sca;
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}
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ins->obj = NULL;
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o->os = (char *)ins;
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}
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if (ins->obj == NULL) {
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ins->obj = getscene(o->oargs.sarg[0], flags);
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} else if ((flags &= ~ins->obj->ldflags)) {
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if (flags & IO_SCENE)
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ins->obj->firstobj = nobjects;
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if (flags)
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readoct(getpath(o->oargs.sarg[0], getrlibpath(), R_OK),
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flags, &ins->obj->scube, NULL);
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if (flags & IO_SCENE)
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ins->obj->nobjs = nobjects - ins->obj->firstobj;
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ins->obj->ldflags |= flags;
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}
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return(ins);
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}
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void
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freescene( /* release a scene reference */
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SCENE *sc
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)
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{
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SCENE shead;
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SCENE *scp;
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if (sc == NULL)
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return;
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if (sc->nref <= 0)
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error(CONSISTENCY, "unreferenced scene in freescene");
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if (--sc->nref) /* still in use? */
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return;
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shead.next = slist; /* else remove from our list */
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for (scp = &shead; scp->next != NULL; scp = scp->next)
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if (scp->next == sc) {
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scp->next = sc->next;
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sc->next = NULL;
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break;
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}
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if (sc->next != NULL) /* can't be in list anymore */
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error(CONSISTENCY, "unlisted scene in freescene");
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slist = shead.next;
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freestr(sc->name); /* free memory */
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octfree(sc->scube.cutree);
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freeobjects(sc->firstobj, sc->nobjs);
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free(sc);
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}
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void
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freeinstance( /* free memory associated with instance */
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OBJREC *o
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)
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{
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if (o->os == NULL)
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return;
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freescene((*(INSTANCE *)o->os).obj);
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free(o->os);
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o->os = NULL;
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}
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