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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2015 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* 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 OSGEARTHUTIL_NIGHT_COLOR_FILTER
#define OSGEARTHUTIL_NIGHT_COLOR_FILTER

#include <osgEarthUtil/Common>
#include <osgEarth/ColorFilter>
#include <osg/Uniform>

namespace osgEarth { namespace Util
{
    /**
    * Color filter that only renders a layer in night
    */
    class OSGEARTHUTIL_EXPORT NightColorFilter : public osgEarth::ColorFilter
    {
    public:
        NightColorFilter();
        NightColorFilter(const Config& conf);
        virtual ~NightColorFilter() { }

    public: // ColorFilter
        virtual std::string getEntryPointFunctionName(void) const;
        virtual void install(osg::StateSet* stateSet) const;
        virtual Config getConfig() const;

    protected:
        unsigned m_instanceId;
    
        void init();
    };

} } // namespace osgEarth::Util

#endif // OSGEARTHUTIL_NIGHT_COLOR_FILTER