Ogre::TerrainPagedWorldSection Class Reference

A world section which includes paged terrain. More...

#include <OgreTerrainPagedWorldSection.h>

Inheritance diagram for Ogre::TerrainPagedWorldSection:

Classes
class	TerrainDefiner

Public Types
typedef std::map< PageID, Page * >	PageMap

Public Member Functions
	TerrainPagedWorldSection (const String &name, PagedWorld *parent, SceneManager *sm)
	Constructor. More...
virtual	~TerrainPagedWorldSection ()
virtual bool	_loadProceduralPage (Page *page)
	Give a section the opportunity to prepare page content procedurally. More...
virtual bool	_prepareProceduralPage (Page *page)
	Give a section the opportunity to prepare page content procedurally. More...
virtual StreamSerialiser *	_readPageStream (PageID pageID)
	Get a serialiser set up to read Page data for the given PageID. More...
virtual bool	_unloadProceduralPage (Page *page)
	Give a section the opportunity to unload page content procedurally. More...
virtual bool	_unprepareProceduralPage (Page *page)
	Give a section the opportunity to unprepare page content procedurally. More...
virtual StreamSerialiser *	_writePageStream (PageID pageID)
	Get a serialiser set up to write Page data for the given PageID. More...
virtual bool	canHandleRequest (const Request *req, const WorkQueue *srcQ)
	Return whether this handler can process a given request. More...
virtual bool	canHandleResponse (const Response *res, const WorkQueue *srcQ)
	Return whether this handler can process a given response. More...
virtual void	frameEnd (Real timeElapsed)
	Called when the frame ends. More...
virtual void	frameStart (Real timeSinceLastFrame)
	Called when the frame starts. More...
virtual const AxisAlignedBox &	getBoundingBox () const
	Get the bounds of this section. More...
virtual Grid2DPageStrategy *	getGridStrategy () const
	Convenience method - this section always uses a grid strategy. More...
virtual Grid2DPageStrategyData *	getGridStrategyData () const
	Convenience method - this section always uses a grid strategy. More...
virtual Real	getHoldRadius ()
	Get the Holding radius. More...
virtual uint32	getLoadingIntervalMs () const
	Get the interval between the loading of single pages in milliseconds (ms) More...
virtual Real	getLoadRadius () const
	Get the loading radius. More...
PageManager *	getManager () const
virtual const String &	getName () const
	Get the name of this section. More...
virtual Page *	getPage (PageID pageID)
	Retrieves a Page. More...
virtual PageID	getPageID (const Vector3 &worldPos)
	Get the page ID for a given world position. More...
virtual PageProvider *	getPageProvider () const
	Get the PageProvider which can provide streams for Pages in this section. More...
virtual int32	getPageRangeMaxX () const
	get the index range of all Pages (values outside this will be ignored) More...
virtual int32	getPageRangeMaxY () const
	get the index range of all Pages (values outside this will be ignored) More...
virtual int32	getPageRangeMinX () const
	get the index range of all Pages (values outside this will be ignored) More...
virtual int32	getPageRangeMinY () const
	get the index range of all Pages (values outside this will be ignored) More...
virtual SceneManager *	getSceneManager () const
	Get the current SceneManager. More...
virtual PageStrategy *	getStrategy () const
	Get the page strategy which this section is using. More...
virtual PageStrategyData *	getStrategyData () const
	Get the data required by the PageStrategy which is specific to this world section. More...
virtual TerrainGroup *	getTerrainGroup ()
	Get the TerrainGroup which this world section is using. More...
virtual const String &	getType ()
	Get the type name of this section. More...
virtual PagedWorld *	getWorld () const
	Get the parent world. More...
WorkQueue::Response *	handleRequest (const WorkQueue::Request *req, const WorkQueue *srcQ)
	WorkQueue::RequestHandler override. More...
void	handleResponse (const WorkQueue::Response *res, const WorkQueue *srcQ)
	WorkQueue::ResponseHandler override. More...
virtual void	holdPage (PageID pageID)
	Ask for a page to be kept in memory if it's loaded. More...
virtual void	init (TerrainGroup *grp)
	Initialise this section from an existing TerrainGroup instance. More...
virtual bool	load (StreamSerialiser &stream)
	Load this section from a stream (returns true if successful) More...
virtual Page *	loadOrCreatePage (const Vector3 &worldPos)
	Load or create a page against this section covering the given world space position. More...
void	loadPage (PageID pageID, bool forceSynchronous=false)
	Overridden from PagedWorldSection. More...
virtual void	notifyCamera (Camera *cam)
	Notify a section of the current camera. More...
virtual void	removeAllPages ()
	Remove all pages immediately. More...
virtual void	save (StreamSerialiser &stream)
	Save this section to a stream. More...
virtual void	setBoundingBox (const AxisAlignedBox &box)
	Set the bounds of this section. More...
void	setDefiner (TerrainDefiner *terrainDefiner)
virtual void	setHoldRadius (Real sz)
	Set the Holding radius. More...
virtual void	setLoadingIntervalMs (uint32 loadingIntervalMs)
	Set the interval between the loading of single pages in milliseconds (ms) More...
virtual void	setLoadRadius (Real sz)
	Set the loading radius. More...
virtual void	setPageProvider (PageProvider *provider)
	Set the PageProvider which can provide streams Pages in this section. More...
virtual void	setPageRange (int32 minX, int32 minY, int32 maxX, int32 maxY)
	Set the index range of all Pages (values outside this will be ignored) More...
virtual void	setPageRangeMaxX (int32 maxX)
	Set the index range of all Pages (values outside this will be ignored) More...
virtual void	setPageRangeMaxY (int32 maxY)
	Set the index range of all Pages (values outside this will be ignored) More...
virtual void	setPageRangeMinX (int32 minX)
	Set the index range of all Pages (values outside this will be ignored) More...
virtual void	setPageRangeMinY (int32 minY)
	Set the index range of all Pages (values outside this will be ignored) More...
virtual void	setSceneManager (SceneManager *sm)
	Change the SceneManager. More...
virtual void	setSceneManager (const String &smName)
	Change the SceneManager. More...
virtual void	setStrategy (PageStrategy *strat)
	Change the page strategy. More...
virtual void	setStrategy (const String &stratName)
	Change the page strategy. More...
void	unloadPage (PageID pageID, bool forceSynchronous=false)
	Overridden from PagedWorldSection. More...
virtual void	unloadPage (Page *p, bool forceSynchronous=false)
	Ask for a page to be unloaded with the given (section-relative) PageID. More...

Static Public Attributes
static const uint32	CHUNK_ID
static const uint16	CHUNK_VERSION
static const uint16	WORKQUEUE_LOAD_TERRAIN_PAGE_REQUEST

Detailed Description

A world section which includes paged terrain.

Remarks

Rather than implement terrain paging as a PageContent subclass, because terrain benefits from direct knowledge of neighbour arrangements and the tight coupling between that and the paging strategy, instead we use a PagedWorldSection subclass. This automatically provides a PageStrategy subclass of the correct type (Grid2DPageStrategy) and derives the correct settings for it compared to the terrain being used. This frees the user from having to try to match all these up through the generic interfaces.

When creating this in code, the user should make use of the helper functions on the TerrainPaging class. The basic sequence is that you define your terrain settings in a TerrainGroup, and then create an instance of TerrainPagedWorldSection via TerrainPaging::createWorldSection. That's basically all there is to it - the normal rules of TerrainGroup apply, it's just that instead of having to choose when to try to load / unload pages from the TerrainGroup, that is automatically done by the paging system. You can also create other types of content in this PagedWorldSection other than terrain, it's just that this comes with terrain handling built-in.

When this world data is saved, you basically get 3 sets of data - firstly the top-level 'world data' which is where the definition of the world sections are stored (and hence, the definition of this class, although none of the terrain instance content is included). Secondly, you get a number of .page files which include any other content that you might have inserted into the pages. Lastly, you get the standard terrain data files which are saved as per TerrainGroup.

Member Typedef Documentation

PageMap

typedef std::map<PageID, Page*> Ogre::PagedWorldSection::PageMap

inherited

Constructor & Destructor Documentation

TerrainPagedWorldSection()

Ogre::TerrainPagedWorldSection::TerrainPagedWorldSection	(	const String &	name,
		PagedWorld *	parent,
		SceneManager *	sm
	)

Constructor.

Parameters

name	The name of the section
parent	The parent world
sm	The SceneManager to use (can be left as null if to be loaded)

~TerrainPagedWorldSection()

virtual Ogre::TerrainPagedWorldSection::~TerrainPagedWorldSection ( )

virtual

Member Function Documentation

init()

virtual void Ogre::TerrainPagedWorldSection::init ( TerrainGroup *  grp )

virtual

Initialise this section from an existing TerrainGroup instance.

Remarks

This is the route you will take if you're defining this world section from scratch in code. The other alternative is that you'll be loading this section from a file, in which case all the settings will be derived from that.

Parameters

grp	The TerrainGroup which will form the basis of this world section. The instance will be owned by this class from now on and will be destroyed by it.

getTerrainGroup()

virtual TerrainGroup* Ogre::TerrainPagedWorldSection::getTerrainGroup ( )

inlinevirtual

Get the TerrainGroup which this world section is using.

Remarks

For information, you can use the returned TerrainGroup to convert to/from x/y locations and the pageID, since the grid strategy is the same.

setLoadRadius()

virtual void Ogre::TerrainPagedWorldSection::setLoadRadius ( Real  sz )

virtual

Set the loading radius.

getLoadRadius()

virtual Real Ogre::TerrainPagedWorldSection::getLoadRadius ( ) const

virtual

Get the loading radius.

setHoldRadius()

virtual void Ogre::TerrainPagedWorldSection::setHoldRadius ( Real  sz )

virtual

Set the Holding radius.

getHoldRadius()

virtual Real Ogre::TerrainPagedWorldSection::getHoldRadius ( )

virtual

Get the Holding radius.

setPageRange()

virtual void Ogre::TerrainPagedWorldSection::setPageRange ( int32  minX, int32  minY, int32  maxX, int32  maxY  )

virtual

Set the index range of all Pages (values outside this will be ignored)

setPageRangeMinX()

virtual void Ogre::TerrainPagedWorldSection::setPageRangeMinX ( int32  minX )

virtual

Set the index range of all Pages (values outside this will be ignored)

setPageRangeMinY()

virtual void Ogre::TerrainPagedWorldSection::setPageRangeMinY ( int32  minY )

virtual

Set the index range of all Pages (values outside this will be ignored)

setPageRangeMaxX()

virtual void Ogre::TerrainPagedWorldSection::setPageRangeMaxX ( int32  maxX )

virtual

Set the index range of all Pages (values outside this will be ignored)

setPageRangeMaxY()

virtual void Ogre::TerrainPagedWorldSection::setPageRangeMaxY ( int32  maxY )

virtual

Set the index range of all Pages (values outside this will be ignored)

getPageRangeMinX()

virtual int32 Ogre::TerrainPagedWorldSection::getPageRangeMinX ( ) const

virtual

get the index range of all Pages (values outside this will be ignored)

getPageRangeMinY()

virtual int32 Ogre::TerrainPagedWorldSection::getPageRangeMinY ( ) const

virtual

get the index range of all Pages (values outside this will be ignored)

getPageRangeMaxX()

virtual int32 Ogre::TerrainPagedWorldSection::getPageRangeMaxX ( ) const

virtual

get the index range of all Pages (values outside this will be ignored)

getPageRangeMaxY()

virtual int32 Ogre::TerrainPagedWorldSection::getPageRangeMaxY ( ) const

virtual

get the index range of all Pages (values outside this will be ignored)

getGridStrategy()

virtual Grid2DPageStrategy* Ogre::TerrainPagedWorldSection::getGridStrategy ( ) const

virtual

Convenience method - this section always uses a grid strategy.

getGridStrategyData()

virtual Grid2DPageStrategyData* Ogre::TerrainPagedWorldSection::getGridStrategyData ( ) const

virtual

Convenience method - this section always uses a grid strategy.

setLoadingIntervalMs()

virtual void Ogre::TerrainPagedWorldSection::setLoadingIntervalMs ( uint32  loadingIntervalMs )

virtual

Set the interval between the loading of single pages in milliseconds (ms)

getLoadingIntervalMs()

virtual uint32 Ogre::TerrainPagedWorldSection::getLoadingIntervalMs ( ) const

virtual

Get the interval between the loading of single pages in milliseconds (ms)

loadPage()

void Ogre::TerrainPagedWorldSection::loadPage ( PageID  pageID, bool  forceSynchronous = false  )

virtual

Overridden from PagedWorldSection.

Reimplemented from Ogre::PagedWorldSection.

unloadPage() [1/2]

void Ogre::TerrainPagedWorldSection::unloadPage ( PageID  pageID, bool  forceSynchronous = false  )

virtual

Overridden from PagedWorldSection.

Reimplemented from Ogre::PagedWorldSection.

handleRequest()

WorkQueue::Response* Ogre::TerrainPagedWorldSection::handleRequest ( const WorkQueue::Request *  req, const WorkQueue *  srcQ  )

virtual

WorkQueue::RequestHandler override.

Implements Ogre::WorkQueue::RequestHandler.

handleResponse()

void Ogre::TerrainPagedWorldSection::handleResponse ( const WorkQueue::Response *  res, const WorkQueue *  srcQ  )

virtual

WorkQueue::ResponseHandler override.

Implements Ogre::WorkQueue::ResponseHandler.

setDefiner()

void Ogre::TerrainPagedWorldSection::setDefiner ( TerrainDefiner *  terrainDefiner )

inline

References OGRE_DELETE.

getManager()

PageManager* Ogre::PagedWorldSection::getManager ( ) const

inherited

getName()

virtual const String& Ogre::PagedWorldSection::getName ( void  ) const

inlinevirtualinherited

Get the name of this section.

getStrategy()

virtual PageStrategy* Ogre::PagedWorldSection::getStrategy ( ) const

inlinevirtualinherited

Get the page strategy which this section is using.

setStrategy() [1/2]

virtual void Ogre::PagedWorldSection::setStrategy ( PageStrategy *  strat )

virtualinherited

Change the page strategy.

Remarks

Doing this will invalidate any pages attached to this world section, and require the PageStrategyData to be repopulated.

setStrategy() [2/2]

virtual void Ogre::PagedWorldSection::setStrategy ( const String &  stratName )

virtualinherited

Change the page strategy.

Remarks

Doing this will invalidate any pages attached to this world section, and require the PageStrategyData to be repopulated.

setSceneManager() [1/2]

virtual void Ogre::PagedWorldSection::setSceneManager ( SceneManager *  sm )

virtualinherited

Change the SceneManager.

Remarks

Doing this will invalidate any pages attached to this world section, and require the pages to be reloaded.

setSceneManager() [2/2]

virtual void Ogre::PagedWorldSection::setSceneManager ( const String &  smName )

virtualinherited

Change the SceneManager.

Remarks

Doing this will invalidate any pages attached to this world section, and require the pages to be reloaded.

Parameters

smName

The instance name of the SceneManager

getSceneManager()

virtual SceneManager* Ogre::PagedWorldSection::getSceneManager ( ) const

inlinevirtualinherited

Get the current SceneManager.

getWorld()

virtual PagedWorld* Ogre::PagedWorldSection::getWorld ( ) const

inlinevirtualinherited

Get the parent world.

getStrategyData()

virtual PageStrategyData* Ogre::PagedWorldSection::getStrategyData ( ) const

inlinevirtualinherited

Get the data required by the PageStrategy which is specific to this world section.

setBoundingBox()

virtual void Ogre::PagedWorldSection::setBoundingBox ( const AxisAlignedBox &  box )

virtualinherited

Set the bounds of this section.

getBoundingBox()

virtual const AxisAlignedBox& Ogre::PagedWorldSection::getBoundingBox ( ) const

virtualinherited

Get the bounds of this section.

load()

virtual bool Ogre::PagedWorldSection::load ( StreamSerialiser &  stream )

virtualinherited

Load this section from a stream (returns true if successful)

save()

virtual void Ogre::PagedWorldSection::save ( StreamSerialiser &  stream )

virtualinherited

Save this section to a stream.

frameStart()

virtual void Ogre::PagedWorldSection::frameStart ( Real  timeSinceLastFrame )

virtualinherited

Called when the frame starts.

frameEnd()

virtual void Ogre::PagedWorldSection::frameEnd ( Real  timeElapsed )

virtualinherited

Called when the frame ends.

notifyCamera()

virtual void Ogre::PagedWorldSection::notifyCamera ( Camera *  cam )

virtualinherited

Notify a section of the current camera.

loadOrCreatePage()

virtual Page* Ogre::PagedWorldSection::loadOrCreatePage ( const Vector3 &  worldPos )

virtualinherited

Load or create a page against this section covering the given world space position.

Remarks

This method is designed mainly for editors - it will try to load an existing page if there is one, otherwise it will create a new one synchronously.

getPageID()

virtual PageID Ogre::PagedWorldSection::getPageID ( const Vector3 &  worldPos )

virtualinherited

Get the page ID for a given world position.

unloadPage() [2/2]

virtual void Ogre::PagedWorldSection::unloadPage ( Page *  p, bool  forceSynchronous = false  )

virtualinherited

Ask for a page to be unloaded with the given (section-relative) PageID.

Remarks

You would not normally call this manually, the PageStrategy is in charge of it usually.

Parameters

p	The Page to unload
forceSynchronous	If true, the page will always be unloaded synchronously

_prepareProceduralPage()

virtual bool Ogre::PagedWorldSection::_prepareProceduralPage ( Page *  page )

virtualinherited

Give a section the opportunity to prepare page content procedurally.

Remarks

You should not call this method directly. This call may well happen in a separate thread so it should not access GPU resources, use _loadProceduralPage for that

Returns

true if the page was populated, false otherwise

_loadProceduralPage()

virtual bool Ogre::PagedWorldSection::_loadProceduralPage ( Page *  page )

virtualinherited

Give a section the opportunity to prepare page content procedurally.

Remarks

You should not call this method directly. This call will happen in the main render thread so it can access GPU resources. Use _prepareProceduralPage for background preparation.

Returns

true if the page was populated, false otherwise

_unloadProceduralPage()

virtual bool Ogre::PagedWorldSection::_unloadProceduralPage ( Page *  page )

virtualinherited

Give a section the opportunity to unload page content procedurally.

Remarks

You should not call this method directly. This call will happen in the main render thread so it can access GPU resources. Use _unprepareProceduralPage for background preparation.

Returns

true if the page was populated, false otherwise

_unprepareProceduralPage()

virtual bool Ogre::PagedWorldSection::_unprepareProceduralPage ( Page *  page )

virtualinherited

Give a section the opportunity to unprepare page content procedurally.

Remarks

You should not call this method directly. This call may well happen in a separate thread so it should not access GPU resources, use _unloadProceduralPage for that

Returns

true if the page was unpopulated, false otherwise

holdPage()

virtual void Ogre::PagedWorldSection::holdPage ( PageID  pageID )

virtualinherited

Ask for a page to be kept in memory if it's loaded.

Remarks

This method indicates that a page should be retained if it's already in memory, but if it's not then it won't trigger a load. This is useful for retaining pages that have just gone out of range, but which you don't want to unload just yet because it's quite possible they may come back into the active set again very quickly / easily. But at the same time, if they've already been purged you don't want to force them to load. This is the 'maybe' region of pages.

Any Page that is neither requested nor held in a frame will be deemed a candidate for unloading.

getPage()

virtual Page* Ogre::PagedWorldSection::getPage ( PageID  pageID )

virtualinherited

Retrieves a Page.

Remarks

This method will only return Page instances that are already loaded. It will return null if a page is not loaded.

removeAllPages()

virtual void Ogre::PagedWorldSection::removeAllPages ( )

virtualinherited

Remove all pages immediately.

Remarks

Effectively 'resets' this section by deleting all pages.

setPageProvider()

virtual void Ogre::PagedWorldSection::setPageProvider ( PageProvider *  provider )

inlinevirtualinherited

Set the PageProvider which can provide streams Pages in this section.

Remarks

This is the top-level way that you can direct how Page data is loaded. When data for a Page is requested for a PagedWorldSection, the following sequence of classes will be checked to see if they have a provider willing to supply the stream: PagedWorldSection, PagedWorld, PageManager. If none of these do, then the default behaviour is to look for a file called worldname_sectionname_pageID.page.

Note

The caller remains responsible for the destruction of the provider.

getPageProvider()

virtual PageProvider* Ogre::PagedWorldSection::getPageProvider ( ) const

inlinevirtualinherited

Get the PageProvider which can provide streams for Pages in this section.

References _OgrePagingExport, and Ogre::operator<<().

_readPageStream()

virtual StreamSerialiser* Ogre::PagedWorldSection::_readPageStream ( PageID  pageID )

virtualinherited

Get a serialiser set up to read Page data for the given PageID.

Parameters

pageID

The ID of the page being requested

Remarks

The StreamSerialiser returned is the responsibility of the caller to delete.

_writePageStream()

virtual StreamSerialiser* Ogre::PagedWorldSection::_writePageStream ( PageID  pageID )

virtualinherited

Get a serialiser set up to write Page data for the given PageID.

Parameters

pageID

The ID of the page being requested

Remarks

The StreamSerialiser returned is the responsibility of the caller to delete.

getType()

virtual const String& Ogre::PagedWorldSection::getType ( )

virtualinherited

Get the type name of this section.

canHandleRequest()

virtual bool Ogre::WorkQueue::RequestHandler::canHandleRequest ( const Request *  req, const WorkQueue *  srcQ  )

inlinevirtualinherited

Return whether this handler can process a given request.

Remarks

Defaults to true, but if you wish to add several handlers each of which deal with different types of request, you can override this method.

Reimplemented in Ogre::Terrain, Ogre::TerrainGroup, Ogre::ResourceBackgroundQueue, Ogre::Page, and Ogre::TerrainLodManager.

References Ogre::WorkQueue::Request::getAborted(), and OGRE_NODISCARD.

Referenced by Ogre::DefaultWorkQueueBase::setResponseProcessingTimeLimit().

canHandleResponse()

virtual bool Ogre::WorkQueue::ResponseHandler::canHandleResponse ( const Response *  res, const WorkQueue *  srcQ  )

inlinevirtualinherited

Return whether this handler can process a given response.

Remarks

Defaults to true, but if you wish to add several handlers each of which deal with different types of response, you can override this method.

Reimplemented in Ogre::Terrain, Ogre::TerrainGroup, Ogre::ResourceBackgroundQueue, Ogre::Page, and Ogre::TerrainLodManager.

References Ogre::WorkQueue::Request::getAborted(), and Ogre::WorkQueue::Response::getRequest().

Member Data Documentation

WORKQUEUE_LOAD_TERRAIN_PAGE_REQUEST

const uint16 Ogre::TerrainPagedWorldSection::WORKQUEUE_LOAD_TERRAIN_PAGE_REQUEST

static

CHUNK_ID

const uint32 Ogre::PagedWorldSection::CHUNK_ID

staticinherited

CHUNK_VERSION

const uint16 Ogre::PagedWorldSection::CHUNK_VERSION

staticinherited

---

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

• OgreTerrainPagedWorldSection.h