/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library 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 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSG_CLEARNODE
#define OSG_CLEARNODE 1

#include <osg/Group>
#include <osg/Vec4>

namespace osg {

/** ClearNode is a Group node which controls the clearing of the color and depth
  * buffers at the start of each frame.
  * The earth sky by default is empty and simply holds the clear color of
  * the background. However, if the uses wants to add their own clearing of
  * the color and depth buffers then the children can be added, and the
  * background clear turned off. The ClearNode by default has StateSet attached
  * to it which sets the default ClearNode bin number to -1, so that all drawables
  * below it are placed in a separate bin from the rest of the scene graph, and
  * are rendered prior to standard opaque and transparent drawables.
*/
class SG_EXPORT ClearNode : public Group
{
    public :
        
        ClearNode();

        ClearNode(const ClearNode& es, const CopyOp& copyop=CopyOp::SHALLOW_COPY):
            Group(es,copyop),
            _requiresClear(es._requiresClear),
            _clearColor(es._clearColor) {}  


        META_Node(osg, ClearNode);

	/** Sets the flag which control whether a glClear is required at the beginning of each frame. */
        inline void setRequiresClear(bool requiresClear) { _requiresClear = requiresClear; }

	/** Gets the flag which control whether a glClear is required at the beginning of each frame. */
        inline bool getRequiresClear() const { return _requiresClear; }

	/** Sets the clear color. */
        inline void setClearColor(const Vec4& color) { _clearColor = color; }

	/** Returns the clear color. */
        inline const Vec4& getClearColor() const { return _clearColor; }

    protected :
    
        virtual ~ClearNode() {}
        
        bool _requiresClear;
        Vec4 _clearColor;  
};

}

#endif