Ogre::ObjectMemoryManager Class Reference

Wrap-around class that contains multiple ArrayMemoryManager, one per render queue. More...

#include <OgreObjectMemoryManager.h>

Inheritance diagram for Ogre::ObjectMemoryManager:

Public Member Functions
	ObjectMemoryManager ()
virtual	~ObjectMemoryManager ()
SceneNode *	_getDummyNode () const
	Returns the pointer to the dummy node (useful when detaching)
size_t	_getTotalRenderQueues () const
void	_setTwin (SceneMemoryMgrTypes memoryManagerType, ObjectMemoryManager *twinMemoryManager)
	@See mMemoryManagerType
virtual void	applyRebase (uint16 level, const MemoryPoolVec &newBasePtrs, const ArrayMemoryManager::PtrdiffVec &diffsList)
	Called when the manager already grew it's memory pool to honour more node requests.
virtual void	buildDiffList (uint16 level, const MemoryPoolVec &basePtrs, ArrayMemoryManager::PtrdiffVec &outDiffsList)
	Called when the manager needs to grow it's memory pool to honour more node requests.
size_t	calculateTotalNumObjectDataIncludingFragmentedSlots () const
	This is the opposite of getTotalNumObjects.
size_t	getFirstObjectData (ObjectData &outObjectData, size_t renderQueue)
	Retrieves a ObjectData pointing to the first MovableObject in the given render queue.
SceneMemoryMgrTypes	getMemoryManagerType () const
size_t	getNumRenderQueues () const
	Retrieves the number of render queues that have been created.
size_t	getTotalNumObjects () const
	Retrieves the sum of the number of objects in all render queues.
ObjectMemoryManager *	getTwin () const
	Note the return value can be null.
void	migrateTo (ObjectData &inOutTransform, size_t renderQueue, ObjectMemoryManager *dstObjectMemoryManager)
	Releases memory belonging to us, not before copying it into another manager.
void	objectCreated (ObjectData &outObjectData, size_t renderQueue)
	Requests memory for the given ObjectData, initializing values.
void	objectDestroyed (ObjectData &outObjectData, size_t renderQueue)
	Releases current memory.
void	objectMoved (ObjectData &inOutObjectData, size_t oldRenderQueue, size_t newRenderQueue)
	Requests memory for the given ObjectData to be moved to a different render queue, transferring existing values inside to the new memory slot.
virtual void	performCleanup (uint16 level, const MemoryPoolVec &basePtrs, size_t const *elementsMemSizes, size_t startInstance, size_t diffInstances)
	Called when too many nodes were destroyed in a non-LIFO fashion.

Detailed Description

Wrap-around class that contains multiple ArrayMemoryManager, one per render queue.

Remarks

This is the main memory manager that actually manages MovableObjects, and has to be called when a new MovableObject was created and when a MovableObject changes RenderQueue.

Note that some SceneManager implementations (i.e. Octree like) may want to have more than one ObjectMemoryManager, for example one per octant.

Constructor & Destructor Documentation

ObjectMemoryManager()

Ogre::ObjectMemoryManager::ObjectMemoryManager

(

)

~ObjectMemoryManager()

virtual Ogre::ObjectMemoryManager::~ObjectMemoryManager ( )

virtual

Member Function Documentation

_getDummyNode()

SceneNode * Ogre::ObjectMemoryManager::_getDummyNode ( ) const

inline

Returns the pointer to the dummy node (useful when detaching)

_getTotalRenderQueues()

size_t Ogre::ObjectMemoryManager::_getTotalRenderQueues ( ) const

inline

_setTwin()

void Ogre::ObjectMemoryManager::_setTwin	(	SceneMemoryMgrTypes	memoryManagerType,
		ObjectMemoryManager *	twinMemoryManager
	)

@See mMemoryManagerType

applyRebase()

virtual void Ogre::ObjectMemoryManager::applyRebase ( uint16  level, const MemoryPoolVec &  newBasePtrs, const ArrayMemoryManager::PtrdiffVec &  diffsList  )

virtual

Called when the manager already grew it's memory pool to honour more node requests.

Remarks

Will use the new base ptr and the list we built in

See also

buildDiffList() to know what mChunkPtr & mIndex needs to be set for each ArrayVector3/etc we have.

Parameters

level	The hierarchy depth level
newBasePtrs	The new base ptr.
diffsList	The list built in buildDiffList

Implements Ogre::ArrayMemoryManager::RebaseListener.

buildDiffList()

virtual void Ogre::ObjectMemoryManager::buildDiffList ( uint16  level, const MemoryPoolVec &  basePtrs, ArrayMemoryManager::PtrdiffVec &  outDiffsList  )

virtual

Called when the manager needs to grow it's memory pool to honour more node requests.

See the class description on why we need to do this (to avoid C++ undefined behavior)

Remarks

Needs to builds a list that will contain the difference in bytes between each ArrayVector3/ArrayMatrix4/etc and the base pointers in_the_order in which the derived class holds those pointers (i.e. in the order the SceneNodes are arranged in memory)

Parameters

level	The hierarchy depth level
basePtrs	The base pointers from each pool so we can calculate the differences
utDiffsList	The list we'll generate. "outDiffsList" already has enough reserved space

Implements Ogre::ArrayMemoryManager::RebaseListener.

calculateTotalNumObjectDataIncludingFragmentedSlots()

size_t Ogre::ObjectMemoryManager::calculateTotalNumObjectDataIncludingFragmentedSlots

(

)

const

This is the opposite of getTotalNumObjects.

This function returns the sum of the return values of getFirstObjectData

getFirstObjectData()

size_t Ogre::ObjectMemoryManager::getFirstObjectData	(	ObjectData &	outObjectData,
		size_t	renderQueue
	)

Retrieves a ObjectData pointing to the first MovableObject in the given render queue.

Parameters

outObjectData	[out] ObjectData with filled pointers to the first MovableObject in this depth
renderQueue	Current render queue it belongs to.

Returns

Number of MovableObject in this depth level

getMemoryManagerType()

SceneMemoryMgrTypes Ogre::ObjectMemoryManager::getMemoryManagerType ( ) const

inline

getNumRenderQueues()

size_t Ogre::ObjectMemoryManager::getNumRenderQueues

(

)

const

Retrieves the number of render queues that have been created.

Remarks

The return value is equal or below mMemoryManagers.size(), you should cache the result instead of calling this function too often.

getTotalNumObjects()

size_t Ogre::ObjectMemoryManager::getTotalNumObjects ( ) const

inline

Retrieves the sum of the number of objects in all render queues.

Remarks

The value is cached to avoid iterating through all RQ levels, however be VERY CAREFUL with this value it may not be equal to the sum of all getFirstObjectData() from all render queues. Specially careful when distributing work to different threads, since you may have to include skipping unassigned slots, and thus the last thread may end up writing out of bounds if you use getTotalNumObjects to allocate a buffer to hold results instead of calculateTotalNumObjectDataIncludingFragmentedSlots (depends on how your algorithm works).

When ARRAY_PACKED_REALS = 4, and 4 objects have been created but the 2nd one has been deleted, getFirstObjectData will still return 4 until the 4th object is removed or a cleanup is performed; whereas getTotalNumObjects will return the actual number of objects.

getTwin()

ObjectMemoryManager * Ogre::ObjectMemoryManager::getTwin ( ) const

inline

Note the return value can be null.

migrateTo()

void Ogre::ObjectMemoryManager::migrateTo	(	ObjectData &	inOutTransform,
		size_t	renderQueue,
		ObjectMemoryManager *	dstObjectMemoryManager
	)

Releases memory belonging to us, not before copying it into another manager.

Remarks

This function is useful when implementing multiple Memory Managers in Scene Managers or when switching nodes from Static to/from Dynamic.

Parameters

inOutTransform	Valid Transform that belongs to us. Output will belong to the other memory mgr.
depth	Current hierarchy level depth it belongs to.
dstObjectMemoryManager	ObjectMemoryManager that will now own the transform.

objectCreated()

void Ogre::ObjectMemoryManager::objectCreated	(	ObjectData &	outObjectData,
		size_t	renderQueue
	)

Requests memory for the given ObjectData, initializing values.

Parameters

outObjectData	ObjectData with filled pointers
renderQueue	RenderQueue ID.

objectDestroyed()

void Ogre::ObjectMemoryManager::objectDestroyed	(	ObjectData &	outObjectData,
		size_t	renderQueue
	)

Releases current memory.

Parameters

outObjectData	ObjectData whose pointers will be nullified.
renderQueue	Current render queue it belongs to.

objectMoved()

void Ogre::ObjectMemoryManager::objectMoved	(	ObjectData &	inOutObjectData,
		size_t	oldRenderQueue,
		size_t	newRenderQueue
	)

Requests memory for the given ObjectData to be moved to a different render queue, transferring existing values inside to the new memory slot.

Parameters

inOutObjectData	ObjectData with filled pointers
oldRenderQueue	RenderQueue it's living now.
newRenderQueue	RenderQueue it wants to live in.

performCleanup()

virtual void Ogre::ObjectMemoryManager::performCleanup ( uint16  level, const MemoryPoolVec &  basePtrs, size_t const *  elementsMemSizes, size_t  startInstance, size_t  diffInstances  )

virtual

Called when too many nodes were destroyed in a non-LIFO fashion.

Without cleaning up, the scene manager will waste CPU & bandwidth on processing vectors & matrices that are not in use. The more fragmented/unordered those removals were, the worst it is. Try to create everything static first, then dynamic content.

Remarks

The manager behaves similarly to a Garbage Collector, as it is triggered after certain amount of nodes have been freed (unless they respected LIFO order)

In a way, it's very similar to vector::remove(), as removing an element from the middle means we need to shift everything past that point one place (or more).

Parameters

level	The hierarchy depth level
basePtrs	The base ptrs.
startInstance	The instance to which past that we need to shift
diffInstances	How many places we need to shift backwards.

Implements Ogre::ArrayMemoryManager::RebaseListener.

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

• OgreObjectMemoryManager.h