#ifndef OSGUTIL_RENDERSTAGE
#define OSGUTIL_RENDERSTAGE 1

#include <osg/Camera>

#include <osgUtil/RenderBin>
#include <osgUtil/RenderStageLighting>

namespace osgUtil {

/**
 * RenderState base class. Used for encapsulate a complete stage in
 * rendering - setting up of viewport, the projection and model
 * matrices and rendering the RenderBin's enclosed with this RenderStage.
 * RenderStage also has a dependancy list of other RenderStages, each
 * of which must be called before the rendering of this stage.  These
 * 'pre' rendering stages are used for advanced rendering techniques
 * like multistage pixel shading or impostors.
 */
class OSGUTIL_EXPORT RenderStage : public RenderBin
{
    public:
    

        RenderStage();
        virtual osg::Object* clone() const { return new RenderStage(); }
        virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const RenderStage*>(obj)!=0L; }
        virtual const char* className() const { return "RenderStage"; }

        virtual void reset();
        
        
        /** Set the viewport of the scene view. */
        void setViewport(int x,int y,int width,int height)
        {
            _view[0] = x;
            _view[1] = y;
            _view[2] = width;
            _view[3] = height;
        }
        
        /** Get the viewport of the scene view. */
        void getViewport(int& x,int& y,int& width,int& height) const
        {
            x = _view[0];
            y = _view[1];
            width = _view[2];
            height = _view[3];
        }


        /** Set the clear mask used in glClear(..).
          * Defaults to GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT. */
        void setClearMask(const GLbitfield mask) { _clearMask = mask; }

        /** Get the clear mask.*/
        const GLbitfield getClearMask() const { return _clearMask; }


        /** Set the clear color used in glClearColor(..). 
          * glClearColor is only called if mask & GL_COLOR_BUFFER_BIT is true*/
        void setClearColor(const osg::Vec4& color) { _clearColor=color; }
        
        /** Get the clear color.*/
        const osg::Vec4& getClearColor() const { return _clearColor; }
        

        /** Set the clear accum used in glClearAccum(..). 
          * glClearAcumm is only called if mask & GL_ACCUM_BUFFER_BIT is true*/
        void setClearAccum(const osg::Vec4& color) { _clearAccum=color; }
        
        /** Get the clear accum.*/
        const osg::Vec4& getClearAccum() const { return _clearAccum; }
        

        
        /** Set the clear depth used in glClearDepth(..). Defaults to 1.0
          * glClearDepth is only called if mask & GL_DEPTH_BUFFER_BIT is true*/
        void setClearDepth(const double depth) { _clearDepth=depth; }
        
        /** Get the clear depth.*/
        const double getClearDepth() const { return _clearDepth; }

        
        /** Set the clear stencil value used in glClearStencil(). Defaults to 1.0 
          * glClearStencil is only called if mask & GL_STENCIL_BUFFER_BIT is true*/
        void setClearStencil(const int stencil) { _clearStencil=stencil; }
        
        /** Get the clear color.*/
        const int getClearStencil() const { return _clearStencil; }

        
        void setCamera(osg::Camera* camera) { _camera = camera; }
        osg::Camera* getCamera() { return _camera.get(); }
        const osg::Camera* getCamera() const { return _camera.get(); }


        void setRenderStageLighting(RenderStageLighting* rsl) { _renderStageLighting = rsl; }

        RenderStageLighting* getRenderStageLighting() const
        {
            if (!_renderStageLighting.valid()) _renderStageLighting = new RenderStageLighting;
            return _renderStageLighting.get();
        }

        void setLightingMode(RenderStageLighting::Mode mode) { getRenderStageLighting()->setLightingMode(mode); }
        RenderStageLighting::Mode getLightingMode() const { return getRenderStageLighting()->getLightingMode(); }

        void setLight(osg::Light* light) { getRenderStageLighting()->setLight(light); }
        osg::Light* getLight() { return getRenderStageLighting()->getLight(); }
        const osg::Light* getLight() const { return getRenderStageLighting()->getLight(); }
        
        virtual void addLight(osg::Light* light,osg::Matrix* matrix)
        {
            getRenderStageLighting()->addLight(light,matrix);
        }

        virtual void draw(osg::State& state,RenderLeaf*& previous);

        void addToDependencyList(RenderStage* rs);

        /** extract stats for current draw list. */
        void getPrims(Statistics *primStats); 
        
    public:
        
        typedef std::vector< osg::ref_ptr<RenderStage> > DependencyList;

        bool                                _stageDrawnThisFrame;
        DependencyList                      _dependencyList;

        osg::ref_ptr<osg::Camera>           _camera;

        // viewport x,y,width,height.
        GLint                               _view[4];
        
        GLbitfield                          _clearMask;
        osg::Vec4                           _clearColor;
        osg::Vec4                           _clearAccum;
        double                              _clearDepth;
        int                                 _clearStencil;

        mutable osg::ref_ptr<RenderStageLighting>   _renderStageLighting;
        
    protected:
    
        virtual ~RenderStage();

};

};

#endif