/* -*-c++-*- */
/* osgEarth - Geospatial SDK for OpenSceneGraph
 * Copyright 2020 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_SILVERLINING_CALLBACK_H
#define OSGEARTH_SILVERLINING_CALLBACK_H 1

#include "Common"
#include "SilverLiningAPIWrapper"

namespace osgEarth { namespace SilverLining
{
    /**
     * A callback that lets you execute code at initialization
     */
    class OSGEARTHSILVERLINING_EXPORT Callback : public osg::Referenced
    {
    public:
        virtual void onInitialize(Atmosphere& atmosphere) { }

        virtual void onDrawSky(Atmosphere& atmosphere) { }

        virtual void onDrawClouds(Atmosphere& atmosphere) { }

        /**
         * Returns elapsed milliseconds from epoch for clouds animation.
         * Use a return value of 0 to use an automatic real-time synchronization.
         */
        virtual unsigned long getMilliseconds() const { return 0; }
    };

} } // namespace osgEarth::SilverLining

#endif // OSGEARTH_SILVERLINING_CALLBACK_H
