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#ifndef lint |
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static const char RCSid[] = "$Id: instance.c,v 2.8 2003/05/13 17:58:32 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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|
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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 "instance.h" |
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|
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#define IO_ILLEGAL (IO_FILES|IO_INFO) |
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|
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static SCENE *slist = NULL; /* list of loaded octrees */ |
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|
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|
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SCENE * |
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getscene(sname, flags) /* get new octree reference */ |
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char *sname; |
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int flags; |
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{ |
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char *pathname; |
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register SCENE *sc; |
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|
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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(USER, 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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|
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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 *ins; |
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|
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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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|
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|
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void |
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freescene(sc) /* release a scene reference */ |
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SCENE *sc; |
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{ |
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SCENE shead; |
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register SCENE *scp; |
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|
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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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sc->nref--; |
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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((void *)sc); |
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} |
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|
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|
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void |
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freeinstance(o) /* free memory associated with instance */ |
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OBJREC *o; |
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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((void *)o->os); |
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o->os = NULL; |
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} |
