Open CASCADE Technology  7.4.1.dev
Public Member Functions
OpenGl_VertexBufferCompat Class 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_VertexBufferCompat.hxx>

Inheritance diagram for OpenGl_VertexBufferCompat:
Inheritance graph
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Public Member Functions

 OpenGl_VertexBufferCompat ()
 Create uninitialized VBO. More...
 
virtual ~OpenGl_VertexBufferCompat ()
 Destroy object. More...
 
virtual bool IsVirtual () const override
 Return TRUE. More...
 
bool Create (const Handle< OpenGl_Context > &theGlCtx) override
 Creates VBO name (id) if not yet generated. Data should be initialized by another method. More...
 
virtual void Release (OpenGl_Context *theGlCtx) override
 Destroy object - will release memory if any. More...
 
virtual void Bind (const Handle< OpenGl_Context > &theGlCtx) const override
 Bind this VBO. More...
 
virtual void Unbind (const Handle< OpenGl_Context > &theGlCtx) const override
 Unbind this VBO. More...
 
- Public Member Functions inherited from OpenGl_VertexBuffer
 OpenGl_VertexBuffer ()
 Create uninitialized VBO. More...
 
virtual ~OpenGl_VertexBuffer ()
 Destroy object. More...
 
virtual GLenum GetTarget () const
 
bool IsValid () const
 
GLuint GetComponentsNb () const
 
GLsizei GetElemsNb () const
 
void SetElemsNb (GLsizei theNbElems)
 Overrides the number of vertex attributes / number of vertexes. It is up to user specifying this number correct (e.g. below initial value)! More...
 
GLenum GetDataType () const
 
GLubyte * GetDataOffset () const
 
bool Init (const Handle< OpenGl_Context > &theGlCtx, const GLuint theComponentsNb, const GLsizei theElemsNb, const GLfloat *theData)
 Notice that VBO will be unbound after this call. More...
 
bool Init (const Handle< OpenGl_Context > &theGlCtx, const GLuint theComponentsNb, const GLsizei theElemsNb, const GLuint *theData)
 Notice that VBO will be unbound after this call. More...
 
bool Init (const Handle< OpenGl_Context > &theGlCtx, const GLuint theComponentsNb, const GLsizei theElemsNb, const GLushort *theData)
 Notice that VBO will be unbound after this call. More...
 
bool Init (const Handle< OpenGl_Context > &theGlCtx, const GLuint theComponentsNb, const GLsizei theElemsNb, const GLubyte *theData)
 Notice that VBO will be unbound after this call. More...
 
bool SubData (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theElemFrom, const GLsizei theElemsNb, const GLfloat *theData)
 Notice that VBO will be unbound after this call. Function replaces portion of data within this VBO using glBufferSubData(). The VBO should be initialized before call. More...
 
bool GetSubData (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theElemFrom, const GLsizei theElemsNb, GLfloat *theData)
 Read back buffer sub-range. Notice that VBO will be unbound after this call. Function reads portion of data from this VBO using glGetBufferSubData(). More...
 
bool SubData (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theElemFrom, const GLsizei theElemsNb, const GLuint *theData)
 Notice that VBO will be unbound after this call. Function replaces portion of data within this VBO using glBufferSubData(). The VBO should be initialized before call. More...
 
bool GetSubData (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theElemFrom, const GLsizei theElemsNb, GLuint *theData)
 Read back buffer sub-range. Notice that VBO will be unbound after this call. Function reads portion of data from this VBO using glGetBufferSubData(). More...
 
bool SubData (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theElemFrom, const GLsizei theElemsNb, const GLushort *theData)
 Notice that VBO will be unbound after this call. Function replaces portion of data within this VBO using glBufferSubData(). The VBO should be initialized before call. More...
 
bool GetSubData (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theElemFrom, const GLsizei theElemsNb, GLushort *theData)
 Read back buffer sub-range. Notice that VBO will be unbound after this call. Function reads portion of data from this VBO using glGetBufferSubData(). More...
 
bool SubData (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theElemFrom, const GLsizei theElemsNb, const GLubyte *theData)
 Notice that VBO will be unbound after this call. Function replaces portion of data within this VBO using glBufferSubData(). The VBO should be initialized before call. More...
 
bool GetSubData (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theElemFrom, const GLsizei theElemsNb, GLubyte *theData)
 Read back buffer sub-range. Notice that VBO will be unbound after this call. Function reads portion of data from this VBO using glGetBufferSubData(). More...
 
void BindVertexAttrib (const Handle< OpenGl_Context > &theGlCtx, const GLuint theAttribLoc) const
 Bind this VBO to active GLSL program. More...
 
void UnbindVertexAttrib (const Handle< OpenGl_Context > &theGlCtx, const GLuint theAttribLoc) const
 Unbind any VBO from active GLSL program. More...
 
void BindAttribute (const Handle< OpenGl_Context > &theCtx, const Graphic3d_TypeOfAttribute theMode) const
 Bind this VBO and enable specified attribute in OpenGl_Context::ActiveProgram() or FFP. More...
 
void UnbindAttribute (const Handle< OpenGl_Context > &theCtx, const Graphic3d_TypeOfAttribute theMode) const
 Unbind this VBO and disable specified attribute in OpenGl_Context::ActiveProgram() or FFP. More...
 
virtual Standard_Size EstimatedDataSize () const override
 Returns estimated GPU memory usage for holding data without considering overheads and allocation alignment rules. More...
 
bool init (const Handle< OpenGl_Context > &theGlCtx, const GLuint theComponentsNb, const GLsizei theElemsNb, const void *theData, const GLenum theDataType)
 Initialize buffer with new data. More...
 
virtual bool HasColorAttribute () const
 
virtual bool HasNormalAttribute () const
 
virtual void BindAllAttributes (const Handle< OpenGl_Context > &theGlCtx) const
 Bind all vertex attributes to active program OpenGl_Context::ActiveProgram() or for FFP. Default implementation does nothing. More...
 
virtual void BindPositionAttribute (const Handle< OpenGl_Context > &theGlCtx) const
 Bind vertex position attribute only. Default implementation does nothing. More...
 
virtual void UnbindAllAttributes (const Handle< OpenGl_Context > &theGlCtx) const
 Unbind all vertex attributes. Default implementation does nothing. More...
 
virtual void DumpJson (Standard_OStream &theOStream, Standard_Integer theDepth=-1) const override
 Dumps the content of me into the stream. More...
 
- Public Member Functions inherited from OpenGl_Resource
 OpenGl_Resource ()
 Empty constructor. More...
 
virtual ~OpenGl_Resource ()
 Destructor. Inheritors should call Clean (NULL) within it. More...
 
- Public Member Functions inherited from Standard_Transient
 Standard_Transient ()
 Empty constructor. More...
 
 Standard_Transient (const Standard_Transient &)
 Copy constructor – does nothing. More...
 
Standard_Transientoperator= (const Standard_Transient &)
 Assignment operator, needed to avoid copying reference counter. More...
 
virtual ~Standard_Transient ()
 Destructor must be virtual. More...
 
virtual void Delete () const
 Memory deallocator for transient classes. More...
 
virtual const opencascade::handle< Standard_Type > & DynamicType () const
 Returns a type descriptor about this object. More...
 
Standard_Boolean IsInstance (const opencascade::handle< Standard_Type > &theType) const
 Returns a true value if this is an instance of Type. More...
 
Standard_Boolean IsInstance (const Standard_CString theTypeName) const
 Returns a true value if this is an instance of TypeName. More...
 
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. More...
 
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. More...
 
Standard_TransientThis () 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. More...
 
Standard_Integer GetRefCount () const
 Get the reference counter of this object. More...
 
void IncrementRefCounter () const
 Increments the reference counter of this object. More...
 
Standard_Integer DecrementRefCounter () const
 Decrements the reference counter of this object; returns the decremented value. More...
 

advanced methods

Handle< NCollection_BuffermyData
 buffer data More...
 
bool initLink (const Handle< NCollection_Buffer > &theData, const GLuint theComponentsNb, const GLsizei theElemsNb, const GLenum theDataType)
 Initialize buffer with existing data. Data will NOT be copied by this method! More...
 
virtual bool init (const Handle< OpenGl_Context > &theGlCtx, const GLuint theComponentsNb, const GLsizei theElemsNb, const void *theData, const GLenum theDataType, const GLsizei theStride) override
 Initialize buffer with new data (data will be copied). More...
 
virtual bool subData (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theElemFrom, const GLsizei theElemsNb, const void *theData, const GLenum theDataType) override
 Update part of the buffer with new data. More...
 
virtual bool getSubData (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theElemFrom, const GLsizei theElemsNb, void *theData, const GLenum theDataType) override
 Read back buffer sub-range. More...
 

Additional Inherited Members

- Public Types inherited from Standard_Transient
typedef void base_type
 Returns a type descriptor about this object. More...
 
- Static Public Member Functions inherited from OpenGl_VertexBuffer
static size_t sizeOfGlType (const GLenum theType)
 
static void bindAttribute (const Handle< OpenGl_Context > &theGlCtx, const Graphic3d_TypeOfAttribute theMode, const GLint theNbComp, const GLenum theDataType, const GLsizei theStride, const GLvoid *theOffset)
 Setup array pointer - either for active GLSL program OpenGl_Context::ActiveProgram() or for FFP using bindFixed() when no program bound. More...
 
static void unbindAttribute (const Handle< OpenGl_Context > &theGlCtx, const Graphic3d_TypeOfAttribute theMode)
 Disable GLSL array pointer - either for active GLSL program OpenGl_Context::ActiveProgram() or for FFP using unbindFixed() when no program bound. More...
 
- Static Public Member Functions inherited from Standard_Transient
static const char * get_type_name ()
 Returns a type descriptor about this object. More...
 
static const opencascade::handle< Standard_Type > & get_type_descriptor ()
 Returns type descriptor of Standard_Transient class. More...
 
- Static Public Attributes inherited from OpenGl_VertexBuffer
static const GLuint NO_BUFFER = 0
 Helpful constants. More...
 
- Protected Attributes inherited from OpenGl_VertexBuffer
GLubyte * myOffset
 offset to data More...
 
GLuint myBufferId
 VBO name (index) More...
 
GLuint myComponentsNb
 Number of components per generic vertex attribute, must be 1, 2, 3, or 4. More...
 
GLsizei myElemsNb
 Number of vertex attributes / number of vertices. More...
 
GLenum myDataType
 Data type (GL_FLOAT, GL_UNSIGNED_INT, GL_UNSIGNED_BYTE etc.) More...
 

Detailed Description

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_VertexBufferCompat()

OpenGl_VertexBufferCompat::OpenGl_VertexBufferCompat ( )

Create uninitialized VBO.

◆ ~OpenGl_VertexBufferCompat()

virtual OpenGl_VertexBufferCompat::~OpenGl_VertexBufferCompat ( )
virtual

Destroy object.

Member Function Documentation

◆ Bind()

virtual void OpenGl_VertexBufferCompat::Bind ( const Handle< OpenGl_Context > &  theGlCtx) const
overridevirtual

Bind this VBO.

Reimplemented from OpenGl_VertexBuffer.

◆ Create()

bool OpenGl_VertexBufferCompat::Create ( const Handle< OpenGl_Context > &  theGlCtx)
overridevirtual

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

Reimplemented from OpenGl_VertexBuffer.

◆ getSubData()

virtual bool OpenGl_VertexBufferCompat::getSubData ( const Handle< OpenGl_Context > &  theGlCtx,
const GLsizei  theElemFrom,
const GLsizei  theElemsNb,
void *  theData,
const GLenum  theDataType 
)
overridevirtual

Read back buffer sub-range.

Reimplemented from OpenGl_VertexBuffer.

◆ init()

virtual bool OpenGl_VertexBufferCompat::init ( const Handle< OpenGl_Context > &  theGlCtx,
const GLuint  theComponentsNb,
const GLsizei  theElemsNb,
const void *  theData,
const GLenum  theDataType,
const GLsizei  theStride 
)
overridevirtual

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

Reimplemented from OpenGl_VertexBuffer.

◆ initLink()

bool OpenGl_VertexBufferCompat::initLink ( const Handle< NCollection_Buffer > &  theData,
const GLuint  theComponentsNb,
const GLsizei  theElemsNb,
const GLenum  theDataType 
)

Initialize buffer with existing data. Data will NOT be copied by this method!

◆ IsVirtual()

virtual bool OpenGl_VertexBufferCompat::IsVirtual ( ) const
inlineoverridevirtual

Return TRUE.

Reimplemented from OpenGl_VertexBuffer.

◆ Release()

virtual void OpenGl_VertexBufferCompat::Release ( OpenGl_Context theGlCtx)
overridevirtual

Destroy object - will release memory if any.

Reimplemented from OpenGl_VertexBuffer.

◆ subData()

virtual bool OpenGl_VertexBufferCompat::subData ( const Handle< OpenGl_Context > &  theGlCtx,
const GLsizei  theElemFrom,
const GLsizei  theElemsNb,
const void *  theData,
const GLenum  theDataType 
)
overridevirtual

Update part of the buffer with new data.

Reimplemented from OpenGl_VertexBuffer.

◆ Unbind()

virtual void OpenGl_VertexBufferCompat::Unbind ( const Handle< OpenGl_Context > &  theGlCtx) const
overridevirtual

Unbind this VBO.

Reimplemented from OpenGl_VertexBuffer.

Field Documentation

◆ myData

Handle< NCollection_Buffer > OpenGl_VertexBufferCompat::myData
protected

buffer data


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