/* -*-c++-*- */
/* osgEarth - Geospatial SDK for OpenSceneGraph
* Copyright 2019 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see
*/
#ifndef OSGEARTH_DRIVERS_MP_TERRAIN_ENGINE_HFCACHE
#define OSGEARTH_DRIVERS_MP_TERRAIN_ENGINE_HFCACHE 1
#include "Common"
#include "TileNode"
#include "TileNodeRegistry"
#include "MPTerrainEngineOptions"
#include
#include
#include
#include
#include
#include
#include
namespace osgEarth { namespace Drivers { namespace MPTerrainEngine
{
using namespace osgEarth;
/** Key into the height field cache */
struct HFKey
{
TileKey _key;
Revision _revision;
ElevationSamplePolicy _samplePolicy;
bool operator < (const HFKey& rhs) const {
if ( _key < rhs._key ) return true;
if ( rhs._key < _key ) return false;
if ( _revision < rhs._revision ) return true;
if ( _revision > rhs._revision ) return false;
return _samplePolicy < rhs._samplePolicy;
}
};
/** value in the height field cache */
struct HFValue
{
osg::ref_ptr _hf;
bool _isFallback;
};
/** caches hightfields for fast neighor lookup */
class HeightFieldCache : public osg::Referenced //, public Revisioned
{
public:
HeightFieldCache(const MPTerrainEngineOptions& options);
void setTileSize(int tileSize)
{
_tileSize = tileSize;
}
bool getOrCreateHeightField(
const MapFrame& frame,
const TileKey& key,
const osg::HeightField* parent_hf,
osg::ref_ptr& out_hf,
bool& out_isFallback,
ElevationSamplePolicy samplePolicy,
ElevationInterpolation interp,
ProgressCallback* progress );
void clear()
{
_cache.clear();
}
private:
bool _enabled;
mutable LRUCache _cache;
int _tileSize;
bool _useParentAsReferenceHF;
};
} } } // namespace osgEarth::Drivers::MPTerrainEngine
#endif // OSGEARTH_DRIVERS_MP_TERRAIN_ENGINE_HFCACHE