/*
 * $Header: /home/barad-dur/vision/forsyth/schenney/sced-0.94/h/RCS/layers.h,v 1.0 1997/05/06 20:42:19 schenney Exp $
 *
 * $Log: layers.h,v $
 * Revision 1.0  1997/05/06 20:42:19  schenney
 * Initial revision
 *
 */
#define PATCHLEVEL 0
/*
**    ScEd: A Constraint Based Scene Editor.
**    Copyright (C) 1994-1998  Stephen Chenney (schenney@cs.berkeley.edu)
**
**    This program is free software; you can redistribute it and/or modify
**    it under the terms of the GNU General Public License as published by
**    the Free Software Foundation; either version 2 of the License, or
**    (at your option) any later version.
**
**    This program is distributed in the hope that it will be useful,
**    but WITHOUT ANY WARRANTY; without even the implied warranty of
**    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**    GNU General Public License for more details.
**
**    You should have received a copy of the GNU General Public License
**    along with this program; if not, write to the Free Software
**    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* Layer structure. */
typedef struct _Layer {
    int     num;
    char    *name;
    Boolean state;
    ObjectInstancePtr   *instances;
    int     num_instances;
    int     max_num;
    } Layer, *LayerPtr;

/*
**  Functions
*/
extern void Add_New_Layer(int, char*, Boolean);
extern void Layers_Init();
extern void Layers_Create_Menu(WindowInfoPtr);
extern Boolean  Layer_Is_Visible(int);
extern void Update_Visible_List(WindowInfoPtr);
extern void Save_Layers(FILE*);
extern int  Layer_Get_Num();
extern void Reset_Layers();
extern void Layer_Add_Instance(LayerPtr, int, ObjectInstancePtr);
extern void Layer_Remove_Instance(LayerPtr, int, ObjectInstancePtr);