/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 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 OSGUTIL_RENDERTOTEXTURESTAGE
#define OSGUTIL_RENDERTOTEXTURESTAGE 1

#include <osg/Texture>
#include <osg/FrameBufferObject>
#include <osg/CameraNode>

#include <osgUtil/RenderStage>

namespace osgUtil {

/**
 * RenderStage which copies the final image to an attached texture or image.
 * Generally used as a pre-rendering stage.
 */
class OSGUTIL_EXPORT RenderToTextureStage : public RenderStage
{
    public:
    

        RenderToTextureStage();
        

        virtual osg::Object* cloneType() const { return new RenderToTextureStage(); }
        virtual osg::Object* clone(const osg::CopyOp&) const { return new RenderToTextureStage(); } // note only implements a clone of type.
        virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const RenderToTextureStage*>(obj)!=0L; }
        virtual const char* libraryName() const { return "osgUtil"; }
        virtual const char* className() const { return "RenderToTextureStage"; }

        virtual void reset();
    
        void setCameraNode(const osg::CameraNode* camera) { _camera = camera; }
        const osg::CameraNode* getCameraNode() const { return _camera; }
        
        void setTexture(osg::Texture* texture, unsigned int level = 0, unsigned int face=0) { _texture = texture; _level = level; _face = face; }
        osg::Texture* getTexture() { return _texture.get(); }
        
        void setImage(osg::Image* image) { _image = image; }
        osg::Image* getImage() { return _image.get(); }
        
        void setImageReadPixelFormat(GLenum format) { _imageReadPixelFormat = format; }
        GLenum getImageReadPixelFormat() const { return _imageReadPixelFormat; }

        void setImageReadPixelDataType(GLenum type) { _imageReadPixelDataType = type; }
        GLenum getImageReadPixelDataType() const { return _imageReadPixelDataType; }

        
        void setFrameBufferObject(osg::FrameBufferObject* fbo) { _fbo = fbo; }
        osg::FrameBufferObject* getFrameBufferObject() { return _fbo.get(); }
        const osg::FrameBufferObject* getFrameBufferObject() const { return _fbo.get(); }
        
        void setGraphicsContext(osg::GraphicsContext* context) { _graphicsContext = context; }
        osg::GraphicsContext* getGraphicsContext() { return _graphicsContext.get(); }
        const osg::GraphicsContext* getGraphicsContext() const { return _graphicsContext.get(); }

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

    public:
        
        
    protected:
    
        virtual ~RenderToTextureStage();

        const osg::CameraNode*                  _camera;
        
        osg::ref_ptr<osg::Texture>              _texture;
        unsigned int                            _level;
        unsigned int                            _face;

        osg::ref_ptr<osg::Image>                _image;
        GLenum                                  _imageReadPixelFormat;
        GLenum                                  _imageReadPixelDataType;
        
        osg::ref_ptr<osg::FrameBufferObject>    _fbo;
        osg::ref_ptr<osg::GraphicsContext>      _graphicsContext;

};

}

#endif