Wrap-around class that contains multiple ArrayMemoryManager, one per hierarchy depth. More...

#include <OgreNodeMemoryManager.h>

Inheritance diagram for Ogre::NodeMemoryManager:

Public Member Functions
	NodeMemoryManager ()

virtual	~NodeMemoryManager ()

SceneNode *	_getDummyNode () const

void	_setTwin (SceneMemoryMgrTypes memoryManagerType, NodeMemoryManager *twinMemoryManager)
	@See mMemoryManagerType More...

void	applyRebase (uint16 level, const MemoryPoolVec &newBasePtrs, const ArrayMemoryManager::PtrdiffVec &diffsList) override
	Called when the manager already grew it's memory pool to honour more node requests. More...

void	buildDiffList (uint16 level, const MemoryPoolVec &basePtrs, ArrayMemoryManager::PtrdiffVec &outDiffsList) override
	Called when the manager needs to grow it's memory pool to honour more node requests. More...

void	defragment ()
	Triggers on demand a defragmentation of the pools, so that all slots become contiguous in memory. More...

size_t	getFirstNode (Transform &outTransform, size_t depth)
	Retrieves a Transform pointing to the first Node in the given depth. More...

SceneMemoryMgrTypes	getMemoryManagerType () const

size_t	getNumDepths () const
	Retrieves the number of depth levels that have been created. More...

NodeMemoryManager *	getTwin () const
	Note the return value can be null. More...

void	migrateTo (Transform &inOutTransform, size_t depth, NodeMemoryManager *dstNodeMemoryManager)
	Releases memory belonging to us, not before copying it into another manager. More...

void	migrateTo (Transform &inOutTransform, size_t oldDepth, size_t newDepth, NodeMemoryManager *dstNodeMemoryManager)
	Releases memory belonging to us, not before copying it into another manager. More...

void	migrateToAndAttach (Transform &inOutTransform, size_t depth, NodeMemoryManager *dstNodeMemoryManager)
	It's the same as calling: this->nodeAttached( transform, depth ); this->migrateTo( transform, depth, dstNodeMemoryManager ); Without unnecessary transfers. More...

void	migrateToAndDetach (Transform &inOutTransform, size_t depth, NodeMemoryManager *dstNodeMemoryManager)
	It's almost the same as calling: this->nodeDettached( transform, depth ); this->migrateTo( transform, 0, dstNodeMemoryManager ); Without unnecessary transfers and setting the correct dstNodeMemoryManager->mDummyNode. More...

void	nodeAttached (Transform &outTransform, size_t depth)
	Requests memory for the given transform to be attached, transferring existing values inside to the new memory block. More...

void	nodeCreated (Transform &outTransform, size_t depth)
	Requests memory for the given transform for the first, initializing values. More...

void	nodeDestroyed (Transform &outTransform, size_t depth)
	Releases current memory. More...

void	nodeDettached (Transform &outTransform, size_t depth)
	Releases current memory and requests memory from the root level. More...

void	nodeMoved (Transform &inOutTransform, size_t oldDepth, size_t newDepth)
	Requests memory for the given Node to be moved to a different depth level, transferring existing values inside to the new memory slot. More...

void	performCleanup (uint16 level, const MemoryPoolVec &basePtrs, size_t const *elementsMemSizes, size_t startInstance, size_t diffInstances) override
	Called when too many nodes were destroyed in a non-LIFO fashion. More...

void	shrinkToFit ()
	Defragments memory, then reallocates a smaller pool that tightly fits the current number of objects. More...

Detailed Description

Wrap-around class that contains multiple ArrayMemoryManager, one per hierarchy depth.

Remarks: This is the main memory manager that actually manages Nodes, and have to be called when a new SceneNode was created, when a SceneNode gets detached from it's parent, when it's attached again, etc.

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

Constructor & Destructor Documentation

◆ NodeMemoryManager()

Ogre::NodeMemoryManager::NodeMemoryManager ( )

◆ ~NodeMemoryManager()

virtual Ogre::NodeMemoryManager::~NodeMemoryManager ( )

virtual

Member Function Documentation

◆ _getDummyNode()

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

inline

◆ _setTwin()

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

@See mMemoryManagerType

◆ applyRebase()

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

overridevirtual

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()

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

overridevirtual

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.

◆ defragment()

void Ogre::NodeMemoryManager::defragment ( )

Triggers on demand a defragmentation of the pools, so that all slots become contiguous in memory.

ArrayMemoryManager::destroySlot already does this when the number of fragmented slots reaches mCleanupThreshold

◆ getFirstNode()

size_t Ogre::NodeMemoryManager::getFirstNode	(	Transform &	outTransform,
		size_t	depth
	)

Retrieves a Transform pointing to the first Node in the given depth.

Parameters

outTransform	[out] Transform with filled pointers to the first Node in this depth
depth	Current hierarchy level depth it belongs to.

Returns: Number of Nodes in this depth level

◆ getMemoryManagerType()

SceneMemoryMgrTypes Ogre::NodeMemoryManager::getMemoryManagerType ( ) const

inline

◆ getNumDepths()

size_t Ogre::NodeMemoryManager::getNumDepths ( ) const

Retrieves the number of depth levels 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.

◆ getTwin()

NodeMemoryManager* Ogre::NodeMemoryManager::getTwin ( ) const

inline

Note the return value can be null.

◆ migrateTo() [1/2]

void Ogre::NodeMemoryManager::migrateTo	(	Transform &	inOutTransform,
		size_t	depth,
		NodeMemoryManager *	dstNodeMemoryManager
	)

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.
dstNodeMemoryManager	NodeMemoryManager that will now own the transform.

◆ migrateTo() [2/2]

void Ogre::NodeMemoryManager::migrateTo	(	Transform &	inOutTransform,
		size_t	oldDepth,
		size_t	newDepth,
		NodeMemoryManager *	dstNodeMemoryManager
	)

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.
oldDepth	Current hierarchy level depth it belongs to in this manager.
newDepth	New hierarchy level depth it will belong belongs in dstNodeMemoryManager. If this value is zero, then oldDepth must be zero as well. Otherwise use migrateToAndDetach instead.
dstNodeMemoryManager	NodeMemoryManager that will now own the transform.

◆ migrateToAndAttach()

void Ogre::NodeMemoryManager::migrateToAndAttach	(	Transform &	inOutTransform,
		size_t	depth,
		NodeMemoryManager *	dstNodeMemoryManager
	)

It's the same as calling: this->nodeAttached( transform, depth ); this->migrateTo( transform, depth, dstNodeMemoryManager ); Without unnecessary transfers.

◆ migrateToAndDetach()

void Ogre::NodeMemoryManager::migrateToAndDetach	(	Transform &	inOutTransform,
		size_t	depth,
		NodeMemoryManager *	dstNodeMemoryManager
	)

It's almost the same as calling: this->nodeDettached( transform, depth ); this->migrateTo( transform, 0, dstNodeMemoryManager ); Without unnecessary transfers and setting the correct dstNodeMemoryManager->mDummyNode.

instead of this->mDummyNode.

◆ nodeAttached()

void Ogre::NodeMemoryManager::nodeAttached	(	Transform &	outTransform,
		size_t	depth
	)

Requests memory for the given transform to be attached, transferring existing values inside to the new memory block.

Remarks: Do NOT call this function twice in a row without having called nodeDettached in the middle

Parameters

outTransform	Transform with filled pointers
depth	Hierarchy level depth the node belongs to. If 0, nothing happens.

◆ nodeCreated()

void Ogre::NodeMemoryManager::nodeCreated	(	Transform &	outTransform,
		size_t	depth
	)

Requests memory for the given transform for the first, initializing values.

Parameters

outTransform	Transform with filled pointers
depth	Hierarchy level depth. 0 if not connected.

◆ nodeDestroyed()

void Ogre::NodeMemoryManager::nodeDestroyed	(	Transform &	outTransform,
		size_t	depth
	)

Releases current memory.

Parameters

outTransform	Transform with nullified pointers
depth	Current hierarchy level depth it belongs to.

◆ nodeDettached()

void Ogre::NodeMemoryManager::nodeDettached	(	Transform &	outTransform,
		size_t	depth
	)

Releases current memory and requests memory from the root level.

Remarks: Do NOT call this function twice in a row without having called nodeAttached in the middle

: outTransform.mParents[outTransform.mIndex] is reset to a dummy parent node

Parameters

outTransform	Transform with filled pointers
depth	Current hierarchy level depth it belongs to. If 0, nothing happens.

◆ nodeMoved()

void Ogre::NodeMemoryManager::nodeMoved	(	Transform &	inOutTransform,
		size_t	oldDepth,
		size_t	newDepth
	)

Requests memory for the given Node to be moved to a different depth level, transferring existing values inside to the new memory slot.

Parameters

inOutTransform	Transform with filled pointers
oldDepth	Current hierarchy level depth it belongs to.
newDepth	Hierarchy level depth it wants to belongs to.

◆ performCleanup()

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

overridevirtual

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.

◆ shrinkToFit()

void Ogre::NodeMemoryManager::shrinkToFit ( )

Defragments memory, then reallocates a smaller pool that tightly fits the current number of objects.

Useful when you know you won't be creating more slots and you need to reclaim memory.

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

OgreNodeMemoryManager.h

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ NodeMemoryManager()

◆ ~NodeMemoryManager()

Member Function Documentation

◆ _getDummyNode()

◆ _setTwin()

◆ applyRebase()

◆ buildDiffList()

◆ defragment()

◆ getFirstNode()

◆ getMemoryManagerType()

◆ getNumDepths()

◆ getTwin()

◆ migrateTo() [1/2]

◆ migrateTo() [2/2]

◆ migrateToAndAttach()

◆ migrateToAndDetach()

◆ nodeAttached()

◆ nodeCreated()

◆ nodeDestroyed()

◆ nodeDettached()

◆ nodeMoved()

◆ performCleanup()

◆ shrinkToFit()