Vaos are OpenGL context specific. They need to be deleted in the context they are created in. Deleting them in a context they are not created in can cause crashes:

Example 1: a vao id in one context representing draw calls state for 1 model/renderable (say 'a') may refer to another vao id in another context for another mesh/renderable altogether (say 'b') So deleting the one for 'a' depending on which context you were in, while actually meaning to delete the one for 'b' can cause the render for 'a' to corrupt or cause a crash

Example 2: a vao id, in one context may not be a legitimate vao id in another context at all. So deleting that vao in the other context can cause OpenGL errors or crashes.

Similarly, Fbos are OpenGL context specific. All of the above applies almost word for word for Fbos. Except that Fbos encapsulate render to texture state, not buffer attributes, bindings like the vao does.

Buffers in VRV are shared across contexts (currently). So, you could actually delete them anywhere. There is a problem with this approach however, because destructors (or releaseGlObjects) on objects (models, etc) holding these can be called from: -a thread that is not the main thread and no associated OpenGL context -a thread (main or otherwise) where the OpenGL context is not active

So, for these 3 classes of OpenGL objects, once you are done with them, you need to call these methods: -DtGlDeleteObjectManager::addVaoToDelete -DtGlDeleteObjectManager::addFboToDelete -DtGlDeleteObjectManager::addBufferHandleToDelete

DtGlDeleteObjectManager::run via DtMainThreadJobsManager once per context This allows this manager to delete the Fbos and Vaos in the right context. This allows this manager to delete the buffers for whichever context is the 1st one active when run is called per tick, per context. (context does not matter, buffers are shared across contexts currently)

Inheritance diagram for makVrv::DtGlDeleteObjectManager:

[legend]

Public Types
enum	ObjectType { VAO = 0, FBO = 1 }

Public Member Functions
virtual	~DtGlDeleteObjectManager ()

	DtGlDeleteObjectManager ()=delete

DtGlDeleteObjectManager &	operator= (const DtGlDeleteObjectManager &rhs)=delete

	DtGlDeleteObjectManager (const DtGlDeleteObjectManager &rhs)=delete

virtual void	run (unsigned int frameNumber)

virtual void	addVaoToDelete (const DtGlVaoAndContext &vao)

virtual void	addFboToDelete (const DtGlFboAndContext &fbo)

virtual void	addBufferHandleToDelete (unsigned int bufferId, bool isMapped=false)

virtual void	addProgramToDelete (unsigned int programId)

virtual void	addGlResourceToDelete (DtGlObject *resource)

Public Member Functions inherited from makVrv::DtVirtualBaseClass
	DtVirtualBaseClass ()

virtual	~DtVirtualBaseClass ()

Static Public Member Functions
static DtGlDeleteObjectManager &	instance (DtDe &de)

Protected Member Functions
	DtGlDeleteObjectManager (DtDe &de)

virtual void	slot_contextAboutToBeDestroyed (const void *glContext)

virtual void	deleteObjects (const void *glContext)

virtual void	deleteObjects (const void glContext, std::unordered_map< const void , std::unordered_set< unsigned int > > &map, ObjectType type)

virtual void	deleteDtGlObjects (const void *glContext)

virtual void	addObject (std::unordered_map< const void *, std::unordered_set< unsigned int > > &map, const DtGlObjectAndContext &objectAndContext, ObjectType type)

virtual void	deleteBuffers (void)

virtual void	deletePrograms (void)

virtual void	checkMapOnShutdown (std::unordered_map< const void *, std::unordered_set< unsigned int > > &map, ObjectType type)

Protected Attributes
DtOsgToGlContextTracker &	myOsgToGlContextTracker

DtIndirectLog &	myIndirectLog

DtDe &	myDe

DtSignalConnectionManager	myConnections

std::unordered_map< const void *, std::unordered_set < unsigned int > >	myVaosToDelete

std::unordered_map< const void *, std::unordered_set < unsigned int > >	myFbosToDelete

std::unordered_map< const void , std::unordered_set < DtGlObject > >	myDtGlObjectsToDelete

std::unordered_set< unsigned int >	myGlBuffersToDelete

std::unordered_set< unsigned int >	myGlBuffersToUnmap

std::unordered_set< unsigned int >	myProgramIdsToDelete

boost::mutex	myMutex

DtGlBufferMemoryTracker *	myGlBufferMemoryTracker = nullptr

Member Enumeration Documentation

enum makVrv::DtGlDeleteObjectManager::ObjectType

Enumerator
VAO
FBO

Constructor & Destructor Documentation

virtual makVrv::DtGlDeleteObjectManager::~DtGlDeleteObjectManager ( )

virtual

destructor

makVrv::DtGlDeleteObjectManager::DtGlDeleteObjectManager ( )

delete

not allowed

makVrv::DtGlDeleteObjectManager::DtGlDeleteObjectManager ( const DtGlDeleteObjectManager & rhs )

delete

not allowed

makVrv::DtGlDeleteObjectManager::DtGlDeleteObjectManager ( DtDe & de )

protected

only creator can create

Member Function Documentation

static DtGlDeleteObjectManager& makVrv::DtGlDeleteObjectManager::instance ( DtDe & de )

static

Access the singleton instance.

DtGlDeleteObjectManager& makVrv::DtGlDeleteObjectManager::operator= ( const DtGlDeleteObjectManager & rhs )

delete

not allowed

virtual void makVrv::DtGlDeleteObjectManager::run ( unsigned int frameNumber )

virtual

run once for every context

virtual void makVrv::DtGlDeleteObjectManager::addVaoToDelete ( const DtGlVaoAndContext & vao )

virtual

add a vao to delete

virtual void makVrv::DtGlDeleteObjectManager::addFboToDelete ( const DtGlFboAndContext & fbo )

virtual

add a fbo to delete

virtual void makVrv::DtGlDeleteObjectManager::addBufferHandleToDelete	(	unsigned int	bufferId,
		bool	isMapped = `false`
	)

virtual

add a buffer to delete isMapped - set to true if buffer is currently mapped

virtual void makVrv::DtGlDeleteObjectManager::addProgramToDelete ( unsigned int programId )

virtual

add a program to delete

virtual void makVrv::DtGlDeleteObjectManager::addGlResourceToDelete ( DtGlObject * resource )

virtual

add a generic DtGlResource to delete

virtual void makVrv::DtGlDeleteObjectManager::slot_contextAboutToBeDestroyed ( const void * glContext )

protectedvirtual

slot for when a context is about to be destroyed This is used to delete the vao

virtual void makVrv::DtGlDeleteObjectManager::deleteObjects ( const void * glContext )

protectedvirtual

internal

virtual void makVrv::DtGlDeleteObjectManager::deleteObjects	(	const void *	glContext,
		std::unordered_map< const void *, std::unordered_set< unsigned int > > &	map,
		ObjectType	type
	)

protectedvirtual

internal

virtual void makVrv::DtGlDeleteObjectManager::deleteDtGlObjects ( const void * glContext )

protectedvirtual

internal

virtual void makVrv::DtGlDeleteObjectManager::addObject	(	std::unordered_map< const void *, std::unordered_set< unsigned int > > &	map,
		const DtGlObjectAndContext &	objectAndContext,
		ObjectType	type
	)

protectedvirtual

internal

virtual void makVrv::DtGlDeleteObjectManager::deleteBuffers ( void )

protectedvirtual

internal

virtual void makVrv::DtGlDeleteObjectManager::deletePrograms ( void )

protectedvirtual

internal

virtual void makVrv::DtGlDeleteObjectManager::checkMapOnShutdown	(	std::unordered_map< const void *, std::unordered_set< unsigned int > > &	map,
		ObjectType	type
	)

protectedvirtual

internal

Member Data Documentation

DtOsgToGlContextTracker& makVrv::DtGlDeleteObjectManager::myOsgToGlContextTracker

protected

DtIndirectLog& makVrv::DtGlDeleteObjectManager::myIndirectLog

protected

DtDe& makVrv::DtGlDeleteObjectManager::myDe

protected

DtSignalConnectionManager makVrv::DtGlDeleteObjectManager::myConnections

protected

for handling context destroyed event

std::unordered_map<const void*, std::unordered_set<unsigned int> > makVrv::DtGlDeleteObjectManager::myVaosToDelete

protected

std::unordered_map<const void*, std::unordered_set<unsigned int> > makVrv::DtGlDeleteObjectManager::myFbosToDelete

protected

std::unordered_map<const void*, std::unordered_set<DtGlObject*> > makVrv::DtGlDeleteObjectManager::myDtGlObjectsToDelete

protected

std::unordered_set<unsigned int> makVrv::DtGlDeleteObjectManager::myGlBuffersToDelete

protected

list of handles to delete and potentially unmap if mapped

std::unordered_set<unsigned int> makVrv::DtGlDeleteObjectManager::myGlBuffersToUnmap

protected

std::unordered_set<unsigned int> makVrv::DtGlDeleteObjectManager::myProgramIdsToDelete

protected

boost::mutex makVrv::DtGlDeleteObjectManager::myMutex

protected

DtGlBufferMemoryTracker* makVrv::DtGlDeleteObjectManager::myGlBufferMemoryTracker = nullptr

protected

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

/data/exports/nrhent7-1/nightly/docs/vrForces.vrf5-1-branch/include/vrvOsg/DtGlDeleteObjectManager.h

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation