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Ogre::PagedWorldSection Class Reference
Optional Components » Paging

Represents a section of the PagedWorld which uses a given PageStrategy, and which is made up of a generally localised set of Page instances. More...

`#include <OgrePagedWorldSection.h>`

Inheritance diagram for Ogre::PagedWorldSection:
[legend]

## Public Types

typedef std::map< PageID, Page * > | PageMap

## Public Member Functions

| PagedWorldSection (const String &name, PagedWorld *parent, SceneManager *sm)
| Construct a new instance, specifying the parent and scene manager.
virtual | ~PagedWorldSection ()
virtual bool | _loadProceduralPage (Page *page)
| Give a section the opportunity to prepare page content procedurally.
virtual bool | _prepareProceduralPage (Page *page)
| Give a section the opportunity to prepare page content procedurally.
virtual StreamSerialiser * | _readPageStream (PageID pageID)
| Get a serialiser set up to read Page data for the given PageID.
virtual bool | _unloadProceduralPage (Page *page)
| Give a section the opportunity to unload page content procedurally.
virtual bool | _unprepareProceduralPage (Page *page)
| Give a section the opportunity to unprepare page content procedurally.
virtual StreamSerialiser * | _writePageStream (PageID pageID)
| Get a serialiser set up to write Page data for the given PageID.
virtual void | frameEnd (Real timeElapsed)
| Called when the frame ends.
virtual void | frameStart (Real timeSinceLastFrame)
| Called when the frame starts.
virtual const AxisAlignedBox & | getBoundingBox () const
| Get the bounds of this section.
PageManager * | getManager () const
virtual const String & | getName () const
| Get the name of this section.
virtual Page * | getPage (PageID pageID)
| Retrieves a Page.
virtual PageID | getPageID (const Vector3 &worldPos)
| Get the page ID for a given world position.
virtual PageProvider * | getPageProvider () const
| Get the PageProvider which can provide streams for Pages in this section.
virtual SceneManager * | getSceneManager () const
| Get the current SceneManager.
virtual PageStrategy * | getStrategy () const
| Get the page strategy which this section is using.
virtual PageStrategyData * | getStrategyData () const
| Get the data required by the PageStrategy which is specific to this world section.
virtual const String & | getType ()
| Get the type name of this section.
virtual PagedWorld * | getWorld () const
| Get the parent world.
virtual void | holdPage (PageID pageID)
| Ask for a page to be kept in memory if it's loaded.
virtual bool | load (StreamSerialiser &stream)
| Load this section from a stream (returns true if successful).
virtual Page * | loadOrCreatePage (const Vector3 &worldPos)
| Load or create a page against this section covering the given world space position.
virtual void | loadPage (PageID pageID, bool forceSynchronous=false)
| Ask for a page to be loaded with the given (section-relative) PageID.
virtual void | notifyCamera (Camera *cam)
| Notify a section of the current camera.
virtual void | removeAllPages ()
| Remove all pages immediately.
virtual void | save (StreamSerialiser &stream)
| Save this section to a stream.
virtual void | setBoundingBox (const AxisAlignedBox &box)
| Set the bounds of this section.
virtual void | setPageProvider (PageProvider *provider)
| Set the PageProvider which can provide streams Pages in this section.
virtual void | setSceneManager (const String &smName)
| Change the SceneManager.
virtual void | setSceneManager (SceneManager *sm)
| Change the SceneManager.
virtual void | setStrategy (const String &stratName)
| Change the page strategy.
virtual void | setStrategy (PageStrategy *strat)
| Change the page strategy.
virtual void | unloadPage (Page *p, bool forceSynchronous=false)
| Ask for a page to be unloaded with the given (section-relative) PageID.
virtual void | unloadPage (PageID pageID, bool forceSynchronous=false)
| Ask for a page to be unloaded with the given (section-relative) PageID.

## Static Public Attributes

static const uint32 | CHUNK_ID
static const uint16 | CHUNK_VERSION

## Detailed Description

Represents a section of the PagedWorld which uses a given PageStrategy, and which is made up of a generally localised set of Page instances.

The reason for PagedWorldSection is that you may wish to cater for multiple sections of your world which use a different approach to paging (ie a different PageStrategy), or which are significantly far apart or separate that the parameters you want to pass to the PageStrategy are different.

  PagedWorldSection instances are fully contained within the PagedWorld and their definitions are loaded in their entirety when the PagedWorld is loaded. However, no Page instances are initially loaded - those are the responsibility of the PageStrategy.

  PagedWorldSection can be subclassed and derived types provided by a PagedWorldSectionFactory. These subclasses might come preconfigured with a strategy for example, or with additional metadata used only for that particular type of section.

  A PagedWorldSection targets a specific SceneManager. When you create one in code via PagedWorld::createSection, you pass that SceneManager in manually. When loading from a saved world file however, the SceneManager type and instance name are saved and that SceneManager is looked up on loading, or created if it didn't exist.

## Member Typedef Documentation

## PageMap

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

## Constructor & Destructor Documentation

## PagedWorldSection()

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

Construct a new instance, specifying the parent and scene manager.

Referenced by operator<<.

## ~PagedWorldSection()

virtual Ogre::PagedWorldSection::~PagedWorldSection | ( |  | ) |

virtual

## Member Function Documentation

## getManager()

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

## getName()

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

inline virtual

Get the name of this section.

## getStrategy()

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

inline virtual

Get the page strategy which this section is using.

## setStrategy() [1/2]

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

virtual

Change the page strategy.

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 | ) |

virtual

Change the page strategy.

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 | ) |

virtual

Change the SceneManager.

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 | ) |

virtual

Change the SceneManager.

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

inline virtual

Get the current SceneManager.

## getWorld()

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

inline virtual

Get the parent world.

## getStrategyData()

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

inline virtual

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

## setBoundingBox()

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

virtual

Set the bounds of this section.

## getBoundingBox()

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

virtual

Get the bounds of this section.

## load()

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

virtual

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

## save()

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

virtual

Save this section to a stream.

## frameStart()

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

virtual

Called when the frame starts.

## frameEnd()

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

virtual

Called when the frame ends.

## notifyCamera()

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

virtual

Notify a section of the current camera.

## loadOrCreatePage()

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

virtual

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

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 | ) |

virtual

Get the page ID for a given world position.

## loadPage()

virtual void Ogre::PagedWorldSection::loadPage | ( | PageID | pageID,
|  | bool | forceSynchronous = false )

virtual

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

You would not normally call this manually, the PageStrategy is in charge of it usually. If this page is already loaded, this request will not load it again. If the page needs loading, then it may be an asynchronous process depending on whether threading is enabled.

Parameters

  pageID | The page ID to load
  forceSynchronous | If true, the page will always be loaded synchronously

Reimplemented in Ogre::TerrainPagedWorldSection.

## unloadPage() [1/2]

virtual void Ogre::PagedWorldSection::unloadPage | ( | PageID | pageID,
|  | bool | forceSynchronous = false )

virtual

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

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

Parameters

  pageID | The page ID to unload
  forceSynchronous | If true, the page will always be unloaded synchronously

Reimplemented in Ogre::TerrainPagedWorldSection.

## unloadPage() [2/2]

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

virtual

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

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 | ) |

virtual

Give a section the opportunity to prepare page content procedurally.

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 | ) |

virtual

Give a section the opportunity to prepare page content procedurally.

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 | ) |

virtual

Give a section the opportunity to unload page content procedurally.

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 | ) |

virtual

Give a section the opportunity to unprepare page content procedurally.

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 | ) |

virtual

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

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 | ) |

virtual

Retrieves a Page.

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 | ( |  | ) |

virtual

Remove all pages immediately.

Effectively 'resets' this section by deleting all pages.

## setPageProvider()

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

inline virtual

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

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

inline virtual

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

## _readPageStream()

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

virtual

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

Parameters

  pageID | The ID of the page being requested

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

## _writePageStream()

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

virtual

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

Parameters

  pageID | The ID of the page being requested

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

## getType()

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

virtual

Get the type name of this section.

## Member Data Documentation

## CHUNK_ID

const uint32 Ogre::PagedWorldSection::CHUNK_ID

static

## CHUNK_VERSION

const uint16 Ogre::PagedWorldSection::CHUNK_VERSION

static

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

- OgrePagedWorldSection.h