DtCutoutCache Class Reference

Contains DtCutoutCache. Binary db for storing cached osgearth cutouts. More...

Classes
struct	Record
	Data for masks in a given tilekey. More...

Public Member Functions
	DtCutoutCache (const DtFilename &filename, const osgEarth::Profile *profile, bool erasePrevious=false)
	Constructor.
virtual	~DtCutoutCache ()
	Virtual destructor.
virtual boost::shared_ptr< Record >	read (const osgEarth::TileKey &key)
	Return cutout data for a given tilekey.
virtual void	write (const osgEarth::TileKey &key, const DtCollisionObjectList &objects, const DtTileData::Extent::Vector &maskExtents)
	Write data to the cache and add it to the map.

Protected Types
typedef std::map < osgEarth::TileKey, boost::shared_ptr< Record > >	CacheMap

Protected Member Functions
void	fillCache ()

Protected Attributes
DtObjectDB::Ptr	myObjectDB
boost::scoped_ptr < DtObjectDB::Cursor >	myCursor
osg::ref_ptr< const osgEarth::Profile >	myProfile
DtObjectDB::Offset	myNextWriteLocationOffset
	offset in the file where we store the offset where the record will be written.
DtObjectDB::Offset	myNextWriteLocation
	offset in the file where the next record will be written.
CacheMap	myCacheMap

Detailed Description

Contains DtCutoutCache. Binary db for storing cached osgearth cutouts.

Cache for mask extents and skirt geometry generated by osgearth for cutouts. Generating this data is slow so caching it greatly increasing terrain loading in areas that intersect the cutouts. Existing data is read from the cache file in the constructor. New data is appended in the write function.

Member Typedef Documentation

typedef std::map<osgEarth::TileKey, boost::shared_ptr<Record> > DtCutoutCache::CacheMap

protected

Constructor & Destructor Documentation

DtCutoutCache::DtCutoutCache ( const DtFilename &  filename, const osgEarth::Profile *  profile, bool  erasePrevious = false  )

explicit

Constructor.

Parameters

filename	Path to cache file. Will be created if it doesn't exist.
profile	osgearth profile for the terrain.
erasePrevious	if true then previous cache file will be erased if it exists.

virtual DtCutoutCache::~DtCutoutCache ( )

virtual

Virtual destructor.

Member Function Documentation

virtual boost::shared_ptr<Record> DtCutoutCache::read ( const osgEarth::TileKey &  key )

virtual

Return cutout data for a given tilekey.

This function does not access the disk. Returns null if the data for the key is not in the cache. The caller must then generate the data and then add it by calling write.

virtual void DtCutoutCache::write ( const osgEarth::TileKey &  key, const DtCollisionObjectList &  objects, const DtTileData::Extent::Vector &  maskExtents  )

virtual

Write data to the cache and add it to the map.

Data added here will be returned by future calls to read.

void DtCutoutCache::fillCache ( )

protected

Member Data Documentation

DtObjectDB::Ptr DtCutoutCache::myObjectDB

protected

boost::scoped_ptr<DtObjectDB::Cursor> DtCutoutCache::myCursor

protected

osg::ref_ptr<const osgEarth::Profile> DtCutoutCache::myProfile

protected

DtObjectDB::Offset DtCutoutCache::myNextWriteLocationOffset

protected

offset in the file where we store the offset where the record will be written.

DtObjectDB::Offset DtCutoutCache::myNextWriteLocation

protected

offset in the file where the next record will be written.

CacheMap DtCutoutCache::myCacheMap

protected

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The documentation for this class was generated from the following file:

• /exports/nfedora7-1/nightly/docs/vrforcesDevelopment.tot/include/vantageTerrainImplementation/cutoutCache.h