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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2012 Pelican Mapping
* http://osgearth.org
*
* osgEarth is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>
*/
#ifndef OSGEARTH_ALPHA_EFFECT_H
#define OSGEARTH_ALPHA_EFFECT_H

#include <osgEarth/Common>
#include <osg/StateSet>
#include <osg/Uniform>
#include <osg/observer_ptr>

namespace osgEarth
{
    /**
     * Shader effect that lets you adjust the alpha channel.
     */
    class OSGEARTH_EXPORT AlphaEffect : public osg::Referenced
    {
    public:
        /** constructs a new effect */
        AlphaEffect();

        /** contructs a new effect and attaches it to a stateset. */
        AlphaEffect(osg::StateSet* stateset);

    public:
        /** The alpha channel value [0..1] */
        void setAlpha(float value);
        float getAlpha() const;

    public:
        /** attach this effect to a stateset. */
        void attach(osg::StateSet* stateset);

        /** detach this effect from any attached statesets. */
        void detach();
        /** detach this effect from a stateset. */
        void detach(osg::StateSet* stateset);

    protected:
        virtual ~AlphaEffect();

        typedef std::list< osg::observer_ptr<osg::StateSet> > StateSetList;

        StateSetList _statesets;
        osg::ref_ptr<osg::Uniform>       _alphaUniform;

        void init();
    };

} // namespace osgEarth::Util

#endif // OSGEARTH_ALPHA_EFFECT_H