OpenGl_BufferCompatT< BaseBufferT > Class Template Reference

Compatibility layer for old OpenGL without VBO. Make sure to pass pointer from GetDataOffset() instead of NULL. Method GetDataOffset() returns pointer to real data in this class (while base class OpenGl_VertexBuffer always return NULL). More...

#include <OpenGl_BufferCompatT.hxx>

Inheritance diagram for OpenGl_BufferCompatT< BaseBufferT >:

Public Member Functions
	OpenGl_BufferCompatT ()
	Create uninitialized VBO.
	~OpenGl_BufferCompatT () override
	Destroy object.
bool	IsVirtual () const override
	Return TRUE.
bool	Create (const occ::handle< OpenGl_Context > &theGlCtx) override
	Creates VBO name (id) if not yet generated. Data should be initialized by another method.
void	Release (OpenGl_Context *theGlCtx) override
	Destroy object - will release memory if any.
void	Bind (const occ::handle< OpenGl_Context > &) const override
	Bind this VBO.
void	Unbind (const occ::handle< OpenGl_Context > &) const override
	Unbind this VBO.

advanced methods
Initialize buffer with existing data. Data will NOT be copied by this method!
occ::handle< NCollection_Buffer >	myData
	buffer data
bool	initLink (const occ::handle< NCollection_Buffer > &theData, const unsigned int theComponentsNb, const int theElemsNb, const unsigned int theDataType)
	buffer data
bool	init (const occ::handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const void *theData, const unsigned int theDataType, const int theStride) override
	Initialize buffer with new data (data will be copied).
bool	subData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, const void *theData, const unsigned int theDataType) override
	Update part of the buffer with new data.
bool	getSubData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, void *theData, const unsigned int theDataType) override
	Read back buffer sub-range.

Detailed Description

template<class BaseBufferT>
class OpenGl_BufferCompatT< BaseBufferT >

Compatibility layer for old OpenGL without VBO. Make sure to pass pointer from GetDataOffset() instead of NULL. Method GetDataOffset() returns pointer to real data in this class (while base class OpenGl_VertexBuffer always return NULL).

Methods Bind()/Unbind() do nothing (do not affect OpenGL state) and ::GetTarget() is never used. For this reason there is no analog for OpenGl_IndexBuffer. Just pass GetDataOffset() to glDrawElements() directly as last argument.

Class overrides methods init() and subData() to copy data into own memory buffer. Extra method initLink() might be used to pass existing buffer through handle without copying the data.

Method Create() creates dummy identifier for this object which should NOT be passed to OpenGL functions.

Constructor & Destructor Documentation

OpenGl_BufferCompatT()

template<class BaseBufferT >

OpenGl_BufferCompatT< BaseBufferT >::OpenGl_BufferCompatT ( )

inline

Create uninitialized VBO.

~OpenGl_BufferCompatT()

template<class BaseBufferT >

OpenGl_BufferCompatT< BaseBufferT >::~OpenGl_BufferCompatT ( )

inlineoverride

Destroy object.

Member Function Documentation

Bind()

template<class BaseBufferT >

void OpenGl_BufferCompatT< BaseBufferT >::Bind ( const occ::handle< OpenGl_Context > & ) const

inlineoverride

Bind this VBO.

Create()

template<class BaseBufferT >

bool OpenGl_BufferCompatT< BaseBufferT >::Create ( const occ::handle< OpenGl_Context > & theGlCtx )

inlineoverride

Creates VBO name (id) if not yet generated. Data should be initialized by another method.

getSubData()

template<class BaseBufferT >

bool OpenGl_BufferCompatT< BaseBufferT >::getSubData ( const occ::handle< OpenGl_Context > & theGlCtx, const int theElemFrom, const int theElemsNb, void * theData, const unsigned int theDataType )

inlineoverride

Read back buffer sub-range.

init()

template<class BaseBufferT >

bool OpenGl_BufferCompatT< BaseBufferT >::init ( const occ::handle< OpenGl_Context > & theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const void * theData, const unsigned int theDataType, const int theStride )

inlineoverride

Initialize buffer with new data (data will be copied).

initLink()

template<class BaseBufferT >

bool OpenGl_BufferCompatT< BaseBufferT >::initLink ( const occ::handle< NCollection_Buffer > & theData, const unsigned int theComponentsNb, const int theElemsNb, const unsigned int theDataType )

inline

buffer data

IsVirtual()

template<class BaseBufferT >

bool OpenGl_BufferCompatT< BaseBufferT >::IsVirtual ( ) const

inlineoverride

Return TRUE.

Release()

template<class BaseBufferT >

void OpenGl_BufferCompatT< BaseBufferT >::Release ( OpenGl_Context * theGlCtx )

inlineoverride

Destroy object - will release memory if any.

subData()

template<class BaseBufferT >

bool OpenGl_BufferCompatT< BaseBufferT >::subData ( const occ::handle< OpenGl_Context > & theGlCtx, const int theElemFrom, const int theElemsNb, const void * theData, const unsigned int theDataType )

inlineoverride

Update part of the buffer with new data.

Unbind()

template<class BaseBufferT >

void OpenGl_BufferCompatT< BaseBufferT >::Unbind ( const occ::handle< OpenGl_Context > & ) const

inlineoverride

Unbind this VBO.

Field Documentation

myData

template<class BaseBufferT >

occ::handle<NCollection_Buffer> OpenGl_BufferCompatT< BaseBufferT >::myData

protected

buffer data

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

• OpenGl_BufferCompatT.hxx