OpenGl_TextureBuffer Class Reference

Texture Buffer Object. This is a special 1D texture that VBO-style initialized. The main differences from general 1D texture: More...

#include <OpenGl_TextureBuffer.hxx>

Inheritance diagram for OpenGl_TextureBuffer:

Public Member Functions
	OpenGl_TextureBuffer ()
	Create uninitialized TBO.
	~OpenGl_TextureBuffer () override
	Destroy object, will throw exception if GPU memory not released with Release() before.
unsigned int	GetTarget () const override
	Override VBO target.
bool	IsValid () const
	Returns true if TBO is valid. Notice that no any real GL call is performed!
void	Release (OpenGl_Context *theGlCtx) override
	Destroy object - will release GPU memory if any.
bool	Create (const occ::handle< OpenGl_Context > &theGlCtx) override
	Creates VBO and Texture names (ids) if not yet generated. Data should be initialized by another method.
bool	Init (const occ::handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const float *theData)
	Perform TBO initialization with specified data. Existing data will be deleted.
bool	Init (const occ::handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const unsigned int *theData)
	Perform TBO initialization with specified data. Existing data will be deleted.
bool	Init (const occ::handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const unsigned short *theData)
	Perform TBO initialization with specified data. Existing data will be deleted.
bool	Init (const occ::handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const uint8_t *theData)
	Perform TBO initialization with specified data. Existing data will be deleted.
void	BindTexture (const occ::handle< OpenGl_Context > &theGlCtx, const Graphic3d_TextureUnit theTextureUnit) const
	Bind TBO to specified Texture Unit.
void	UnbindTexture (const occ::handle< OpenGl_Context > &theGlCtx, const Graphic3d_TextureUnit theTextureUnit) const
	Unbind TBO.
unsigned int	TextureId () const
	Returns name of TBO.
unsigned int	TextureFormat () const
	Returns internal texture format.
Public Member Functions inherited from OpenGl_Buffer
	OpenGl_Buffer ()
	Create uninitialized buffer.
	~OpenGl_Buffer () override
	Destroy object.
virtual bool	IsVirtual () const
	Return TRUE if this is a virtual (for backward compatibility) VBO object.
bool	IsValid () const
unsigned int	GetComponentsNb () const
int	GetElemsNb () const
void	SetElemsNb (int theNbElems)
	Overrides the number of vertex attributes / number of vertexes. It is up to user specifying this number correct (e.g. below initial value)!
unsigned int	GetDataType () const
uint8_t *	GetDataOffset () const
virtual void	Bind (const occ::handle< OpenGl_Context > &theGlCtx) const
	Bind this buffer object.
virtual void	Unbind (const occ::handle< OpenGl_Context > &theGlCtx) const
	Unbind this buffer object.
bool	Init (const occ::handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const float *theData)
	Notice that buffer object will be unbound after this call.
bool	Init (const occ::handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const unsigned int *theData)
	Notice that buffer object will be unbound after this call.
bool	Init (const occ::handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const unsigned short *theData)
	Notice that buffer object will be unbound after this call.
bool	Init (const occ::handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const uint8_t *theData)
	Notice that buffer object will be unbound after this call.
bool	SubData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, const float *theData)
	Notice that buffer object will be unbound after this call. Function replaces portion of data within this buffer object using glBufferSubData(). The buffer object should be initialized before call.
bool	GetSubData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, float *theData)
	Read back buffer sub-range. Notice that buffer object will be unbound after this call. Function reads portion of data from this buffer object using glGetBufferSubData().
bool	SubData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, const unsigned int *theData)
	Notice that buffer object will be unbound after this call. Function replaces portion of data within this buffer object using glBufferSubData(). The buffer object should be initialized before call.
bool	GetSubData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, unsigned int *theData)
	Read back buffer sub-range. Notice that buffer object will be unbound after this call. Function reads portion of data from this buffer object using glGetBufferSubData().
bool	SubData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, const unsigned short *theData)
	Notice that buffer object will be unbound after this call. Function replaces portion of data within this buffer object using glBufferSubData(). The buffer object should be initialized before call.
bool	GetSubData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, unsigned short *theData)
	Read back buffer sub-range. Notice that buffer object will be unbound after this call. Function reads portion of data from this buffer object using glGetBufferSubData().
bool	SubData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, const uint8_t *theData)
	Notice that buffer object will be unbound after this call. Function replaces portion of data within this buffer object using glBufferSubData(). The buffer object should be initialized before call.
bool	GetSubData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, uint8_t *theData)
	Read back buffer sub-range. Notice that buffer object will be unbound after this call. Function reads portion of data from this buffer object using glGetBufferSubData().
size_t	EstimatedDataSize () const override
	offset to data
virtual 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)
	Initialize buffer with new data.
bool	init (const occ::handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const int theElemsNb, const void *theData, const unsigned int theDataType)
	Initialize buffer with new data.
virtual bool	subData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, const void *theData, const unsigned int theDataType)
	Update part of the buffer with new data.
virtual bool	getSubData (const occ::handle< OpenGl_Context > &theGlCtx, const int theElemFrom, const int theElemsNb, void *theData, const unsigned int theDataType)
	Read back buffer sub-range.
void	DumpJson (Standard_OStream &theOStream, int theDepth=-1) const override
	Dumps the content of me into the stream.
Public Member Functions inherited from OpenGl_Resource
	OpenGl_Resource ()
	Empty constructor.
	~OpenGl_Resource () override
	Destructor. Inheritors should call Clean (NULL) within it.
Public Member Functions inherited from Standard_Transient
	Standard_Transient ()
	Empty constructor.
	Standard_Transient (const Standard_Transient &)
	Copy constructor – does nothing.
Standard_Transient &	operator= (const Standard_Transient &)
	Assignment operator, needed to avoid copying reference counter.
virtual	~Standard_Transient ()=default
	Destructor must be virtual.
virtual const opencascade::handle< Standard_Type > &	DynamicType () const
	Returns a type descriptor about this object.
bool	IsInstance (const opencascade::handle< Standard_Type > &theType) const
	Returns a true value if this is an instance of Type.
bool	IsInstance (const char *const theTypeName) const
	Returns a true value if this is an instance of TypeName.
bool	IsKind (const opencascade::handle< Standard_Type > &theType) const
	Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism.
bool	IsKind (const char *const theTypeName) const
	Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism.
Standard_Transient *	This () const
	Returns non-const pointer to this object (like const_cast). For protection against creating handle to objects allocated in stack or call from constructor, it will raise exception Standard_ProgramError if reference counter is zero.
int	GetRefCount () const noexcept
	Get the reference counter of this object.
void	IncrementRefCounter () noexcept
	Increments the reference counter of this object. Uses relaxed memory ordering since incrementing only requires atomicity, not synchronization with other memory operations.
int	DecrementRefCounter () noexcept
	Decrements the reference counter of this object; returns the decremented value. Uses release ordering for the decrement to ensure all writes to the object are visible before the count reaches zero. An acquire fence is added only when the count reaches zero, ensuring proper synchronization before deletion. This is more efficient than using acq_rel for every decrement.
virtual void	Delete () const
	Memory deallocator for transient classes.

Static Public Attributes
static const unsigned int	NO_TEXTURE = 0
	Helpful constants.
Static Public Attributes inherited from OpenGl_Buffer
static const unsigned int	NO_BUFFER = 0
	Helpful constants.

Protected Attributes
unsigned int	myTextureId
	texture id
unsigned int	myTexFormat
	internal texture format
uint8_t *	myOffset
	offset to data
unsigned int	myBufferId
	VBO name (index).
unsigned int	myComponentsNb
	Number of components per generic vertex attribute, must be 1, 2, 3, or 4.
int	myElemsNb
	Number of vertex attributes / number of vertices.
unsigned int	myDataType
	Data type (GL_FLOAT, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE etc.).

Additional Inherited Members
typedef void	base_type
	Returns a type descriptor about this object.
Static Public Member Functions inherited from OpenGl_Buffer
static TCollection_AsciiString	FormatTarget (unsigned int theTarget)
	Format VBO target enumeration value.
static size_t	sizeOfGlType (unsigned int theType)
static constexpr const char *	get_type_name ()
	Returns a type descriptor about this object.
static const opencascade::handle< Standard_Type > &	get_type_descriptor ()
	Returns type descriptor of Standard_Transient class.
void	BindBufferBase (const occ::handle< OpenGl_Context > &theGlCtx, unsigned int theIndex)
	Binds a buffer object to an indexed buffer target. Wrapper for glBindBufferBase().
void	UnbindBufferBase (const occ::handle< OpenGl_Context > &theGlCtx, unsigned int theIndex)
	Unbinds a buffer object from an indexed buffer target. Wrapper for glBindBufferBase().
void	BindBufferRange (const occ::handle< OpenGl_Context > &theGlCtx, unsigned int theIndex, const intptr_t theOffset, const size_t theSize)
	Binds a buffer object to an indexed buffer target with specified offset and size. Wrapper for glBindBufferRange().

Detailed Description

Texture Buffer Object. This is a special 1D texture that VBO-style initialized. The main differences from general 1D texture:

• no interpolation between field;
• greater sizes;
• special sampler object in GLSL shader to access data by index.

Notice that though TBO is inherited from VBO this is to unify design user shouldn't cast it to base class and all really useful methods are declared in this class.

Constructor & Destructor Documentation

OpenGl_TextureBuffer()

OpenGl_TextureBuffer::OpenGl_TextureBuffer

(

)

Create uninitialized TBO.

~OpenGl_TextureBuffer()

OpenGl_TextureBuffer::~OpenGl_TextureBuffer ( )

override

Destroy object, will throw exception if GPU memory not released with Release() before.

Member Function Documentation

BindTexture()

void OpenGl_TextureBuffer::BindTexture	(	const occ::handle< OpenGl_Context > &	theGlCtx,
		const Graphic3d_TextureUnit	theTextureUnit ) const

Bind TBO to specified Texture Unit.

Create()

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

overridevirtual

Creates VBO and Texture names (ids) if not yet generated. Data should be initialized by another method.

Reimplemented from OpenGl_Buffer.

GetTarget()

unsigned int OpenGl_TextureBuffer::GetTarget ( ) const

overridevirtual

Override VBO target.

Implements OpenGl_Buffer.

Init() [1/4]

bool OpenGl_TextureBuffer::Init	(	const occ::handle< OpenGl_Context > &	theGlCtx,
		const unsigned int	theComponentsNb,
		const int	theElemsNb,
		const float *	theData )

Perform TBO initialization with specified data. Existing data will be deleted.

Init() [2/4]

bool OpenGl_TextureBuffer::Init	(	const occ::handle< OpenGl_Context > &	theGlCtx,
		const unsigned int	theComponentsNb,
		const int	theElemsNb,
		const uint8_t *	theData )

Perform TBO initialization with specified data. Existing data will be deleted.

Init() [3/4]

bool OpenGl_TextureBuffer::Init	(	const occ::handle< OpenGl_Context > &	theGlCtx,
		const unsigned int	theComponentsNb,
		const int	theElemsNb,
		const unsigned int *	theData )

Perform TBO initialization with specified data. Existing data will be deleted.

Init() [4/4]

bool OpenGl_TextureBuffer::Init	(	const occ::handle< OpenGl_Context > &	theGlCtx,
		const unsigned int	theComponentsNb,
		const int	theElemsNb,
		const unsigned short *	theData )

Perform TBO initialization with specified data. Existing data will be deleted.

IsValid()

bool OpenGl_TextureBuffer::IsValid ( ) const

inline

Returns true if TBO is valid. Notice that no any real GL call is performed!

Release()

void OpenGl_TextureBuffer::Release ( OpenGl_Context * theGlCtx )

overridevirtual

Destroy object - will release GPU memory if any.

Reimplemented from OpenGl_Buffer.

TextureFormat()

unsigned int OpenGl_TextureBuffer::TextureFormat ( ) const

inline

Returns internal texture format.

TextureId()

unsigned int OpenGl_TextureBuffer::TextureId ( ) const

inline

Returns name of TBO.

UnbindTexture()

void OpenGl_TextureBuffer::UnbindTexture	(	const occ::handle< OpenGl_Context > &	theGlCtx,
		const Graphic3d_TextureUnit	theTextureUnit ) const

Unbind TBO.

Field Documentation

myTexFormat

unsigned int OpenGl_TextureBuffer::myTexFormat

protected

internal texture format

myTextureId

unsigned int OpenGl_TextureBuffer::myTextureId

protected

texture id

NO_TEXTURE

const unsigned int OpenGl_TextureBuffer::NO_TEXTURE = 0

static

Helpful constants.

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

• OpenGl_TextureBuffer.hxx