#ifndef OSGUTIL_RENDERLEAF
#define OSGUTIL_RENDERLEAF 1

#include <osg/ref_ptr>
#include <osg/Matrix>
#include <osg/Drawable>
#include <osg/State>

#include <osgUtil/Export>

namespace osgUtil {

// forward declare RenderGraph
class RenderGraph;

/** container class for all data required for rendering of drawables.
  */
class OSGUTIL_EXPORT RenderLeaf : public osg::Referenced
{
    public:
    

        inline RenderLeaf(osg::Drawable* drawable,osg::Matrix* matrix, float depth=0.0f):
            _parent(NULL),
            _drawable(drawable),
            _matrix(matrix),
            _depth(depth) {}

        
	inline void set(osg::Drawable* drawable,osg::Matrix* matrix, float depth=0.0f)
	{
	    _parent = NULL;
	    _drawable = drawable;
	    _matrix = matrix;
	    _depth = depth;
	}
	
	inline void reset()
	{
	    _parent = NULL;
	    _drawable = NULL;
	    _matrix = NULL;
	    _depth = 0.0f;
	}

	
        virtual void render(osg::State& state,RenderLeaf* previous);
        
        /// allow RenderGraph to change the RenderLeaf's _parent.
        friend RenderGraph;

    public:
    
        RenderGraph*                _parent;
        osg::Drawable*              _drawable;
        osg::ref_ptr<osg::Matrix>   _matrix;
        float                       _depth;

    private:

        /// disallow creation of blank RenderLeaf as this isn't useful.
        RenderLeaf():
            _parent(NULL),
            _drawable(NULL),
            _matrix(NULL),
            _depth(0.0f) {}

        /// disallow copy construction.
        RenderLeaf(const RenderLeaf&):osg::Referenced() {}
        /// disallow copy operator.
        RenderLeaf& operator = (const RenderLeaf&) { return *this; }

};

};

#endif