/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2013 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 OSGEARTHUTIL_GLSL_COLOR_FILTER
#define OSGEARTHUTIL_GLSL_COLOR_FILTER

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

namespace osgEarth { namespace Util
{
    /**
     * Color filter that lets you inject custom GLSL code.
     */
    class OSGEARTHUTIL_EXPORT GLSLColorFilter : public osgEarth::ColorFilter
    {
    public:
        GLSLColorFilter();
        GLSLColorFilter(const Config& conf);
        virtual ~GLSLColorFilter() { }

        void setCode(const std::string& code) { _code = code; }
        const std::string& getCode() const { return _code; }

    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();
        std::string _code;
    };

} } // namespace osgEarth::Util

#endif // OSGEARTHUTIL_GLSL_COLOR_FILTER
