makVrv::DtGlVaoManager Class Reference

This class is used to manage an opengl vertex array object (VAO) dealing with multiple opengl contexts.

background: VAO's cannot be shared between OpenGL contexts. This class helps manage that situation by creating and tracking VAO handles for each unique context.

Basically, the user should call getOrCreateVao with a graphics context active (typically during draw) to get a handle for a VAO for that specific graphics context. getOrCreateVao will indicate if a new context was encountered and at that time the user should bind buffers associated with the VAO. When the VAO is not longer needed (for example, during shutdown), clearVao(0), and deleteQueuedVaos(0) should be called. These are also called in the destructor of this class so no need to call if destorying this manager.

Methods clearVao, deleteQueuedVaos can also be called for a specific graphics context to just modify that context.

Public Member Functions
	DtGlVaoManager (makVrv::DtDe &de)
virtual	~DtGlVaoManager ()
virtual DtGlVaoAndContext	getOrCreateVao (const osg::GraphicsContext *graphicsContext, bool &created) const
virtual void	clearVao (const osg::GraphicsContext *graphicsContext) const
virtual void	deleteQueuedVaos (const osg::GraphicsContext *graphicsContext) const

Protected Types
typedef std::map < osg::observer_ptr< const osg::GraphicsContext > , DtGlVaoAndContext >	MapContextToVao
typedef std::vector < DtGlVaoAndContext >	VaoArray
typedef std::map < osg::observer_ptr< const osg::GraphicsContext > , VaoArray >	MapContextsToVaoArray

Protected Member Functions
virtual void	deleteQueuedVaosInAllGc (osg::GraphicsContext *graphicsContext) const
virtual void	slot_windowToBeDestroyed (DtWindow *window)
virtual void	attemptToDeleteVao (const void *glContext, DtGlVaoAndContext &fbo) const

Protected Attributes
DtDe &	myDe
DtSignalConnectionManager	myConnections
MapContextToVao	myMutableGraphicsContextToVao
MapContextsToVaoArray	myMutableGraphicsContextToVaoArrayToDelete

Private Member Functions
	DtGlVaoManager ()
	DtGlVaoManager (const DtGlVaoManager &other)
DtGlVaoManager &	operator= (const DtGlVaoManager &other)

Member Typedef Documentation

typedef std::map<osg::observer_ptr<const osg::GraphicsContext>, DtGlVaoAndContext> makVrv::DtGlVaoManager::MapContextToVao

protected

Mutables below. These are mutable due to the fact that osg has drawImplementation as const These mutables are protected instead of private so they can be used by any future derived classes.

typedef std::vector<DtGlVaoAndContext> makVrv::DtGlVaoManager::VaoArray

protected

typedef std::map<osg::observer_ptr<const osg::GraphicsContext>, VaoArray > makVrv::DtGlVaoManager::MapContextsToVaoArray

protected

Constructor & Destructor Documentation

makVrv::DtGlVaoManager::DtGlVaoManager

(

makVrv::DtDe &

de

)

CTOR.

virtual makVrv::DtGlVaoManager::~DtGlVaoManager ( )

virtual

DTOR.

makVrv::DtGlVaoManager::DtGlVaoManager ( )

private

Default Constructor not implemented - not allowed.

makVrv::DtGlVaoManager::DtGlVaoManager ( const DtGlVaoManager &  other )

private

Copy Constructor not implemented - Copy not allowed.

Member Function Documentation

DtGlVaoManager& makVrv::DtGlVaoManager::operator= ( const DtGlVaoManager &  other )

private

Assignment Operator not implemented - Assignment not allowed.

virtual DtGlVaoAndContext makVrv::DtGlVaoManager::getOrCreateVao ( const osg::GraphicsContext *  graphicsContext, bool &  created  ) const

virtual

Gets or creates a vertex array object (VAO) and returns the handle to it.

Parameters

state	The state object that contains the graphics context.
created	This value is set to true if the VAO is newly created.

virtual void makVrv::DtGlVaoManager::clearVao ( const osg::GraphicsContext *  graphicsContext ) const

virtual

Clears the VAO from graphics context mapping and queues it to be deleted. If state is NULL(0), then VAO is cleared from all contexts.

Parameters

graphicsContext

The graphics context.

virtual void makVrv::DtGlVaoManager::deleteQueuedVaos ( const osg::GraphicsContext *  graphicsContext ) const

virtual

Removes the VAO for a specific graphics context. Assumes the graphics context is active. If graphicsContext is NULL(0), then VAO is removed from all contexts.

Parameters

graphicsContext

The graphics context.

virtual void makVrv::DtGlVaoManager::deleteQueuedVaosInAllGc ( osg::GraphicsContext *  graphicsContext ) const

protectedvirtual

Removes the VAO for all contexts. This should be called when destructing or releasing OpenGL resources. For non-active contexts, the VAO's are handed off to a DtGlDeleteObjectManager to be deleted when appropriate.

Parameters

graphicsContext

The graphics context.

virtual void makVrv::DtGlVaoManager::slot_windowToBeDestroyed ( DtWindow *  window )

protectedvirtual

Handles window closing (context destroyed).

virtual void makVrv::DtGlVaoManager::attemptToDeleteVao ( const void *  glContext, DtGlVaoAndContext &  fbo  ) const

protectedvirtual

internal

Member Data Documentation

DtDe& makVrv::DtGlVaoManager::myDe

protected

DtSignalConnectionManager makVrv::DtGlVaoManager::myConnections

protected

MapContextToVao makVrv::DtGlVaoManager::myMutableGraphicsContextToVao

mutableprotected

MapContextsToVaoArray makVrv::DtGlVaoManager::myMutableGraphicsContextToVaoArrayToDelete

mutableprotected

Keep track of what vertex array objects (VAOs) we have seen per context so that we can delete the Vaos in the right context.

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

• /data/exports/nrhent7-1/nightly/docs/vrForces.vrf5-0-branch/include/vrvOsg/DtGlVaoManager.h