OpenGl_IndexBuffer Class Reference

Index buffer is just a VBO with special target (GL_ELEMENT_ARRAY_BUFFER). More...

#include <OpenGl_IndexBuffer.hxx>

Inheritance diagram for OpenGl_IndexBuffer:

Public Member Functions
	OpenGl_IndexBuffer ()
	Empty constructor.
virtual unsigned int	GetTarget () const override
	Return buffer object target (GL_ELEMENT_ARRAY_BUFFER).
virtual void	DumpJson (Standard_OStream &theOStream, Standard_Integer theDepth=-1) const override
	Dumps the content of me into the stream.
Public Member Functions inherited from OpenGl_Buffer
	OpenGl_Buffer ()
	Create uninitialized buffer.
virtual	~OpenGl_Buffer ()
	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
Standard_Integer	GetElemsNb () const
void	SetElemsNb (Standard_Integer 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
Standard_Byte *	GetDataOffset () const
virtual bool	Create (const Handle< OpenGl_Context > &theGlCtx)
	Creates buffer object name (id) if not yet generated. Data should be initialized by another method.
virtual void	Release (OpenGl_Context *theGlCtx) override
	Destroy object - will release GPU memory if any.
virtual void	Bind (const Handle< OpenGl_Context > &theGlCtx) const
	Bind this buffer object.
virtual void	Unbind (const Handle< OpenGl_Context > &theGlCtx) const
	Unbind this buffer object.
bool	Init (const Handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const Standard_Integer theElemsNb, const float *theData)
	Notice that buffer object will be unbound after this call.
bool	Init (const Handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const Standard_Integer theElemsNb, const unsigned int *theData)
	Notice that buffer object will be unbound after this call.
bool	Init (const Handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const Standard_Integer theElemsNb, const unsigned short *theData)
	Notice that buffer object will be unbound after this call.
bool	Init (const Handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const Standard_Integer theElemsNb, const Standard_Byte *theData)
	Notice that buffer object will be unbound after this call.
bool	SubData (const Handle< OpenGl_Context > &theGlCtx, const Standard_Integer theElemFrom, const Standard_Integer 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 Handle< OpenGl_Context > &theGlCtx, const Standard_Integer theElemFrom, const Standard_Integer 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 Handle< OpenGl_Context > &theGlCtx, const Standard_Integer theElemFrom, const Standard_Integer 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 Handle< OpenGl_Context > &theGlCtx, const Standard_Integer theElemFrom, const Standard_Integer 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 Handle< OpenGl_Context > &theGlCtx, const Standard_Integer theElemFrom, const Standard_Integer 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 Handle< OpenGl_Context > &theGlCtx, const Standard_Integer theElemFrom, const Standard_Integer 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 Handle< OpenGl_Context > &theGlCtx, const Standard_Integer theElemFrom, const Standard_Integer theElemsNb, const Standard_Byte *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 Handle< OpenGl_Context > &theGlCtx, const Standard_Integer theElemFrom, const Standard_Integer theElemsNb, Standard_Byte *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().
virtual Standard_Size	EstimatedDataSize () const override
	Returns estimated GPU memory usage for holding data without considering overheads and allocation alignment rules.
virtual bool	init (const Handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const Standard_Integer theElemsNb, const void *theData, const unsigned int theDataType, const Standard_Integer theStride)
	Initialize buffer with new data.
bool	init (const Handle< OpenGl_Context > &theGlCtx, const unsigned int theComponentsNb, const Standard_Integer theElemsNb, const void *theData, const unsigned int theDataType)
	Initialize buffer with new data.
virtual bool	subData (const Handle< OpenGl_Context > &theGlCtx, const Standard_Integer theElemFrom, const Standard_Integer theElemsNb, const void *theData, const unsigned int theDataType)
	Update part of the buffer with new data.
virtual bool	getSubData (const Handle< OpenGl_Context > &theGlCtx, const Standard_Integer theElemFrom, const Standard_Integer theElemsNb, void *theData, const unsigned int theDataType)
	Read back buffer sub-range.
Public Member Functions inherited from OpenGl_Resource
	OpenGl_Resource ()
	Empty constructor.
virtual	~OpenGl_Resource ()
	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 ()
	Destructor must be virtual.
virtual const opencascade::handle< Standard_Type > &	DynamicType () const
	Returns a type descriptor about this object.
Standard_Boolean	IsInstance (const opencascade::handle< Standard_Type > &theType) const
	Returns a true value if this is an instance of Type.
Standard_Boolean	IsInstance (const Standard_CString theTypeName) const
	Returns a true value if this is an instance of TypeName.
Standard_Boolean	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.
Standard_Boolean	IsKind (const Standard_CString 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.
Standard_Integer	GetRefCount () const noexcept
	Get the reference counter of this object.
void	IncrementRefCounter () noexcept
	Increments the reference counter of this object.
Standard_Integer	DecrementRefCounter () noexcept
	Decrements the reference counter of this object; returns the decremented value.
virtual void	Delete () const
	Memory deallocator for transient classes.

Additional Inherited Members
Public Types inherited from Standard_Transient
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 Public Member Functions inherited from Standard_Transient
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.
Static Public Attributes inherited from OpenGl_Buffer
static const unsigned int	NO_BUFFER = 0
	Helpful constants.
Protected Member Functions inherited from OpenGl_Buffer
void	BindBufferBase (const Handle< OpenGl_Context > &theGlCtx, unsigned int theIndex)
	Binds a buffer object to an indexed buffer target. Wrapper for glBindBufferBase().
void	UnbindBufferBase (const Handle< OpenGl_Context > &theGlCtx, unsigned int theIndex)
	Unbinds a buffer object from an indexed buffer target. Wrapper for glBindBufferBase().
void	BindBufferRange (const 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().
Protected Attributes inherited from OpenGl_Buffer
Standard_Byte *	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.
Standard_Integer	myElemsNb
	Number of vertex attributes / number of vertices.
unsigned int	myDataType
	Data type (GL_FLOAT, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE etc.)

Detailed Description

Index buffer is just a VBO with special target (GL_ELEMENT_ARRAY_BUFFER).

Constructor & Destructor Documentation

OpenGl_IndexBuffer()

OpenGl_IndexBuffer::OpenGl_IndexBuffer

(

)

Empty constructor.

Member Function Documentation

DumpJson()

virtual void OpenGl_IndexBuffer::DumpJson ( Standard_OStream & theOStream, Standard_Integer theDepth = -1 ) const

overridevirtual

Dumps the content of me into the stream.

Reimplemented from OpenGl_Buffer.

GetTarget()

virtual unsigned int OpenGl_IndexBuffer::GetTarget ( ) const

overridevirtual

Return buffer object target (GL_ELEMENT_ARRAY_BUFFER).

Implements OpenGl_Buffer.

---

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

• OpenGl_IndexBuffer.hxx