/* -*-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_TRITON_DRAWABLE_H
#define OSGEARTH_TRITON_DRAWABLE_H

#include <osg/Drawable>
#include <osg/RenderInfo>
#include <osg/TextureCubeMap>
#include <osg/Version>
#include <osg/Texture2D>
#include <osg/buffered_value>

#include <osgEarth/Terrain>
#include <osgEarth/NativeProgramAdapter>
#include <osgEarth/ImageLayer>
#include <osgEarth/VerticalDatum>

const unsigned int TRITON_OCEAN_MASK = 0x4; // 0100

namespace osgEarth { namespace Triton
{
    class TritonContext;
    class TritonHeightMap;

    /**
     * Custom drawable for rendering the Triton ocean effects
     */
    class TritonDrawable : public osg::Drawable
    {
    public:
        TritonDrawable(TritonContext* TRITON);

        //! Layer to use as an ocean rendering mask
        void setMaskLayer(const osgEarth::ImageLayer* maskLayer);

        //! Height map generator to use to mask out the ocean where the
        //! terrain has positive elevation
        void setHeightMapGenerator(TritonHeightMap* heightMap);

        //! Vertical datum to use to calculate sea level
        void setVerticalDatum(VerticalDatum* value) {
            _verticalDatum = value;
        }

        //! Gets the Triton Camera associated with an osg Camera
        ::Triton::Camera* getTritonCam(const osg::Camera* cam) {
            return _local.get(cam)._tritonCam;
        }

        void setPlanarReflectionMap(osg::Texture2D* map);

        void setPlanarReflectionProjection(osg::RefMatrix* proj);

    public: // osg::Drawable

        void drawImplementation(osg::RenderInfo& ri) const override;

        osg::BoundingBox computeBoundingBox() const override;

    protected:
        virtual ~TritonDrawable();

        osg::observer_ptr<TritonContext>  _TRITON;
        osg::observer_ptr<const osgEarth::ImageLayer> _maskLayer;
        osg::ref_ptr<osg::TextureCubeMap> _cubeMap;
        
        osg::ref_ptr<osg::Texture2D> _planarReflectionMap;
        osg::ref_ptr<osg::RefMatrix> _planarReflectionProjection;

        mutable osg::ref_ptr<TritonHeightMap> _heightMapGenerator;

        osg::ref_ptr<VerticalDatum> _verticalDatum;
        osg::ref_ptr<const SpatialReference> _wgs84, _ecef;

        mutable osg::buffered_object<osgEarth::NativeProgramAdapterCollection> _adapters;

        struct CameraLocal
        {
            ::Triton::Camera* _tritonCam = nullptr;
        };
        mutable PerObjectFastMap<const osg::Camera*, CameraLocal> _local;
    };

} } // namespace osgEarth::Triton

#endif // OSGEARTH_TRITON_DRAWABLE_H