makVrv::DtIndirectClearBufferProgram Class Reference

This class clears buffers using compute shader Theoretically, there are performance gains to be achieved by doing this in compute shader as explained here: https://jira.mak.com/browse/VRV-2672 Furthermore, this is inherently scalable in terms of parallelism (future cards will have more cores/larger work group size)/ Furthermore, glClearNamedBufferData seem to cause crashes because of driver heuristics when memory usage is high. Lastly, Vulkan based applications do it this way anyway.

Inheritance diagram for makVrv::DtIndirectClearBufferProgram:

Public Member Functions
	DtIndirectClearBufferProgram (DtDe &de)
virtual	~DtIndirectClearBufferProgram ()
	DtIndirectClearBufferProgram ()=delete
	DtIndirectClearBufferProgram (const DtIndirectClearBufferProgram &)=delete
DtIndirectClearBufferProgram &	operator= (const DtIndirectClearBufferProgram &)=delete
virtual void	clearBuffer (DtGlBuffer *buffer, unsigned int clearValue)
virtual void	deleteShaders ()
virtual void	incrementNumUsers ()
virtual void	decrementNumUsers ()
Public Member Functions inherited from makVrv::DtVirtualBaseClass
	DtVirtualBaseClass ()
virtual	~DtVirtualBaseClass ()

Static Public Member Functions
static DtIndirectClearBufferProgram *	instance (DtDe &de)

Protected Member Functions
virtual void	initializeShadersIfNecessary (void)

Protected Attributes
DtGlProgram *	myClearProgram
DtVector3< int >	myWorkGroupLocalSize
tbb::atomic< int >	myNumUsers
int	myBufferSizeLoc
int	myClearValueLoc
DtDe &	myDe

Static Protected Attributes
static const std::string	theShaderFilePath

Constructor & Destructor Documentation

makVrv::DtIndirectClearBufferProgram::DtIndirectClearBufferProgram

(

DtDe &

de

)

constructor

virtual makVrv::DtIndirectClearBufferProgram::~DtIndirectClearBufferProgram ( )

virtual

destructor

makVrv::DtIndirectClearBufferProgram::DtIndirectClearBufferProgram ( )

delete

not allowed

makVrv::DtIndirectClearBufferProgram::DtIndirectClearBufferProgram ( const DtIndirectClearBufferProgram &  )

delete

not allowed

Member Function Documentation

static DtIndirectClearBufferProgram* makVrv::DtIndirectClearBufferProgram::instance ( DtDe &  de )

static

singleton access to lod manager program

DtIndirectClearBufferProgram& makVrv::DtIndirectClearBufferProgram::operator= ( const DtIndirectClearBufferProgram &  )

delete

not allowed

virtual void makVrv::DtIndirectClearBufferProgram::clearBuffer ( DtGlBuffer *  buffer, unsigned int  clearValue  )

virtual

clear a buffer to a given value

virtual void makVrv::DtIndirectClearBufferProgram::deleteShaders ( )

virtual

cleanup the gpu shaders

virtual void makVrv::DtIndirectClearBufferProgram::incrementNumUsers ( )

virtual

ref counting tracking

virtual void makVrv::DtIndirectClearBufferProgram::decrementNumUsers ( )

virtual

ref counting tracking

virtual void makVrv::DtIndirectClearBufferProgram::initializeShadersIfNecessary ( void  )

protectedvirtual

create the compute shader if not yet created or after reload shaders is called

Member Data Documentation

DtGlProgram* makVrv::DtIndirectClearBufferProgram::myClearProgram

protected

handle to the actual gl program

DtVector3<int> makVrv::DtIndirectClearBufferProgram::myWorkGroupLocalSize

protected

local work group sisze

tbb::atomic<int> makVrv::DtIndirectClearBufferProgram::myNumUsers

protected

the ref count (users)

int makVrv::DtIndirectClearBufferProgram::myBufferSizeLoc

protected

locations of some uniforms

int makVrv::DtIndirectClearBufferProgram::myClearValueLoc

protected

DtDe& makVrv::DtIndirectClearBufferProgram::myDe

protected

reference to de

const std::string makVrv::DtIndirectClearBufferProgram::theShaderFilePath

staticprotected

the shader file path

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

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