/* -*-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_GEOCOMMON_H
#define OSGEARTH_GEOCOMMON_H 1

// For FLT_MAX
#include <limits.h>
#include <cfloat>

#undef  NO_DATA_VALUE
#define NO_DATA_VALUE -FLT_MAX

namespace osgEarth
{
//    constexpr float NO_DATA_VALUE = -FLT_MAX;

    /**
     * Types of interpolation between two geodetic locations.
     */
    enum GeoInterpolation
    {
        GEOINTERP_GREAT_CIRCLE,
        GEOINTERP_RHUMB_LINE
    };

    /**
     * Elevation/Image grid interpolation methods.
     */
    enum RasterInterpolation
    {
        INTERP_AVERAGE,
        INTERP_NEAREST,
        INTERP_BILINEAR,
        INTERP_TRIANGULATE,
        INTERP_CUBIC,
        INTERP_CUBICSPLINE
    };

    /**
     * Elevation stack sampling policy
     */
    enum ElevationSamplePolicy
    {
        SAMPLE_FIRST_VALID,
        SAMPLE_HIGHEST,
        SAMPLE_LOWEST,
        SAMPLE_AVERAGE
    };

    /**
     * Elevation NO_DATA treatment policy
     */
    enum ElevationNoDataPolicy
    {
        NODATA_INTERPOLATE,     // interpolate across NO_DATA samples
        NODATA_MSL              // rewrite NO_DATA samples as MSL
    };

    /**
     * Indicates how to interpret a Z coordinate.
     */
    enum AltitudeMode
    {
        ALTMODE_ABSOLUTE,  // Z value is the absolute height above MSL/HAE.
        ALTMODE_RELATIVE   // Z value is the height above the terrain elevation.
    };
}

#endif // OSGEARTH_GEODATA_H