/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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 OSGFX_MULTITEXTURECONTROL
#define OSGFX_MULTITEXTURECONTROL

#include <osg/Group>

#include <osgFX/Export>

namespace osgFX
{
    /**
      This node provides control over the which texture units are active and the
      blending weighting between them.
     */
    class OSGFX_EXPORT MultiTextureControl: public osg::Group {
    public:

        MultiTextureControl();
        MultiTextureControl(const MultiTextureControl& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);

        META_Node(osgFX, MultiTextureControl);
        
        void setTextureWeight(unsigned int unit, float weight);

        float getTextureWeight(unsigned int unit) const { return (unit<_textureWeightList.size()) ?  _textureWeightList[unit] : 0.0f; }
        
        unsigned int getNumTextureWeights() const { return _textureWeightList.size(); }
        
    protected:
        virtual ~MultiTextureControl() {}
        MultiTextureControl& operator = (const MultiTextureControl&) { return *this; }
        
        void updateStateSet();
        
        typedef std::vector<float> TextureWeightList;
        TextureWeightList _textureWeightList;
    };

}

#endif
