/* -*-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/>
 */
#pragma once

#include <osgEarth/Common>
#include <osgEarth/URI>
#include <osgEarth/VisibleLayer>

namespace osgEarth
{
    using namespace osgEarth;

    /**
     * Options governing bump mapping of the terrain.
     * A Bump Map is a repeating normal texture that modifies the
     * existing normal vector per fragment.
     */
    class BumpMapOptions : public VisibleLayer::Options
    {
        META_LayerOptions(osgEarth, BumpMapOptions, VisibleLayer::Options);

    public:
        //! bump map texture to load.
        OE_OPTION(URI, imageURI);
        //! Intensity of normal map effect.
        OE_OPTION(float, intensity, 1.0f);
        //! Scale factor for the normal map texture.
        OE_OPTION(float, scale, 1.0f);
        //! Number of times to proressively scale and multisample the bump map based on camera range. Default is 1.
        OE_OPTION(int, octaves, 1);
        //! Camera range at which to render one octave (outer range).
        OE_OPTION(float, maxRange, 25000.0f);
        //! LOD at which the bumpmap renders at a scale of 1.0.
        OE_OPTION(unsigned, baseLOD, 13u);

        Config getConfig() const {
            Config conf = ConfigOptions::getConfig();
            conf.set("image",     _imageURI);
            conf.set("intensity", _intensity);
            conf.set("scale",     _scale);
            conf.set("octaves",   _octaves);
            conf.set("max_range", _maxRange);
            conf.set("base_lod",  _baseLOD);
            return conf;
        }

        void fromConfig( const Config& conf ) {
            conf.get("image",     _imageURI);
            conf.get("intensity", _intensity);
            conf.get("scale",     _scale);
            conf.get("octaves",   _octaves);
            conf.get("max_range", _maxRange);
            conf.get("base_lod",  _baseLOD);
        }
    };
} // namespace osgEarth