Class implements FrameBuffer Object (FBO) resource intended for off-screen rendering. More...

#include <OpenGl_FrameBuffer.hxx>

Inheritance diagram for OpenGl_FrameBuffer:

Public Member Functions
	OpenGl_FrameBuffer ()
	Empty constructor. More...

virtual	~OpenGl_FrameBuffer ()
	Destructor. More...

virtual void	Release (OpenGl_Context *theGlCtx) override
	Destroy object - will release GPU memory if any. More...

GLsizei	NbSamples () const
	Number of multisampling samples. More...

GLsizei	NbColorBuffers () const
	Number of color buffers. More...

bool	HasColor () const
	Return true if FBO has been created with color attachment. More...

bool	HasDepth () const
	Return true if FBO has been created with depth attachment. More...

GLsizei	GetSizeX () const
	Textures width. More...

GLsizei	GetSizeY () const
	Textures height. More...

GLsizei	GetVPSizeX () const
	Viewport width. More...

GLsizei	GetVPSizeY () const
	Viewport height. More...

GLsizei	GetInitVPSizeX () const
	Viewport width. More...

GLsizei	GetInitVPSizeY () const
	Viewport height. More...

Standard_Boolean	IsValid () const
	Returns true if current object was initialized. More...

Standard_Boolean	Init (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theSizeX, const GLsizei theSizeY, const OpenGl_ColorFormats &theColorFormats, const Handle< OpenGl_Texture > &theDepthStencilTexture, const GLsizei theNbSamples=0)
	Initialize FBO for rendering into single/multiple color buffer and depth textures. More...

Standard_Boolean	Init (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theSizeX, const GLsizei theSizeY, const GLint theColorFormat, const GLint theDepthFormat, const GLsizei theNbSamples=0)
	Initialize FBO for rendering into textures. More...

Standard_Boolean	Init (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theSizeX, const GLsizei theSizeY, const OpenGl_ColorFormats &theColorFormats, const GLint theDepthFormat, const GLsizei theNbSamples=0)
	Initialize FBO for rendering into single/multiple color buffer and depth textures. More...

Standard_Boolean	InitLazy (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theViewportSizeX, const GLsizei theViewportSizeY, const GLint theColorFormat, const GLint theDepthFormat, const GLsizei theNbSamples=0)
	(Re-)initialize FBO with specified dimensions. More...

Standard_Boolean	InitLazy (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theViewportSizeX, const GLsizei theViewportSizeY, const OpenGl_ColorFormats &theColorFormats, const GLint theDepthFormat, const GLsizei theNbSamples=0)
	(Re-)initialize FBO with specified dimensions. More...

Standard_Boolean	InitLazy (const Handle< OpenGl_Context > &theGlCtx, const OpenGl_FrameBuffer &theFbo)
	(Re-)initialize FBO with properties taken from another FBO. More...

Standard_Boolean	InitWithRB (const Handle< OpenGl_Context > &theGlCtx, const GLsizei theSizeX, const GLsizei theSizeY, const GLint theColorFormat, const GLint theDepthFormat, const GLuint theColorRBufferFromWindow=0)
	(Re-)initialize FBO with specified dimensions. The Render Buffer Objects will be used for Color, Depth and Stencil attachments (as opposite to textures). More...

Standard_Boolean	InitWrapper (const Handle< OpenGl_Context > &theGlCtx)
	Initialize class from currently bound FBO. Retrieved OpenGL objects will not be destroyed on Release. More...

void	SetupViewport (const Handle< OpenGl_Context > &theGlCtx)
	Setup viewport to render into FBO. More...

void	ChangeViewport (const GLsizei theVPSizeX, const GLsizei theVPSizeY)
	Override viewport settings. More...

virtual void	BindBuffer (const Handle< OpenGl_Context > &theGlCtx)
	Bind frame buffer for drawing and reading (to render into the texture). More...

virtual void	BindDrawBuffer (const Handle< OpenGl_Context > &theGlCtx)
	Bind frame buffer for drawing GL_DRAW_FRAMEBUFFER (to render into the texture). More...

virtual void	BindReadBuffer (const Handle< OpenGl_Context > &theGlCtx)
	Bind frame buffer for reading GL_READ_FRAMEBUFFER. More...

virtual void	UnbindBuffer (const Handle< OpenGl_Context > &theGlCtx)
	Unbind frame buffer. More...

const Handle< OpenGl_Texture > &	ColorTexture (const GLint theColorBufferIndex=0) const
	Returns the color texture for the given color buffer index. More...

const Handle< OpenGl_Texture > &	DepthStencilTexture () const
	Returns the depth-stencil texture. More...

GLuint	ColorRenderBuffer () const
	Returns the color Render Buffer. More...

GLuint	DepthStencilRenderBuffer () const
	Returns the depth Render Buffer. More...

virtual Standard_Size	EstimatedDataSize () const override
	Returns estimated GPU memory usage for holding data without considering overheads and allocation alignment rules. 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_Transient &	operator= (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_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. 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...

Static Public Member Functions
static Standard_Boolean	BufferDump (const Handle< OpenGl_Context > &theGlCtx, const Handle< OpenGl_FrameBuffer > &theFbo, Image_PixMap &theImage, Graphic3d_BufferType theBufferType)
	Dump content into image. 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
static const GLuint	NO_FRAMEBUFFER = 0
	Helpful constants. More...

static const GLuint	NO_RENDERBUFFER = 0

Protected Types
typedef NCollection_Vector< Handle< OpenGl_Texture > >	OpenGl_TextureArray

Protected Member Functions
Standard_Boolean	isValidFrameBuffer () const

Static Protected Member Functions
static bool	getDepthDataFormat (GLint theTextFormat, GLenum &thePixelFormat, GLenum &theDataType)
	Determine data type from texture sized format. More...

static bool	getColorDataFormat (const Handle< OpenGl_Context > &theCtx, GLint theTextFormat, GLenum &thePixelFormat, GLenum &theDataType)
	Determine data type from texture sized format. More...

Protected Attributes
GLsizei	myInitVPSizeX
	viewport width specified during initialization (kept even on failure) More...

GLsizei	myInitVPSizeY
	viewport height specified during initialization (kept even on failure) More...

GLsizei	myVPSizeX
	viewport width (should be <= texture width) More...

GLsizei	myVPSizeY
	viewport height (should be <= texture height) More...

GLsizei	myNbSamples
	number of MSAA samples More...

OpenGl_ColorFormats	myColorFormats
	sized format for color texture, GL_RGBA8 by default More...

GLint	myDepthFormat
	sized format for depth-stencil texture, GL_DEPTH24_STENCIL8 by default More...

GLuint	myGlFBufferId
	FBO object ID. More...

GLuint	myGlColorRBufferId
	color Render Buffer object (alternative to myColorTexture) More...

GLuint	myGlDepthRBufferId
	depth-stencil Render Buffer object (alternative to myDepthStencilTexture) More...

bool	myIsOwnBuffer
	flag indicating that FBO should be deallocated by this class More...

bool	myIsOwnDepth
	flag indicating that FBO should be deallocated by this class More...

OpenGl_TextureArray	myColorTextures
	color texture objects More...

Handle< OpenGl_Texture >	myDepthStencilTexture
	depth-stencil texture object More...

Additional Inherited Members
Public Types inherited from Standard_Transient
typedef void	base_type
	Returns a type descriptor about this object. More...

Detailed Description

Class implements FrameBuffer Object (FBO) resource intended for off-screen rendering.

Member Typedef Documentation

◆ OpenGl_TextureArray

typedef NCollection_Vector<Handle< OpenGl_Texture > > OpenGl_FrameBuffer::OpenGl_TextureArray

protected

Constructor & Destructor Documentation

◆ OpenGl_FrameBuffer()

OpenGl_FrameBuffer::OpenGl_FrameBuffer ( )

Empty constructor.

◆ ~OpenGl_FrameBuffer()

virtual OpenGl_FrameBuffer::~OpenGl_FrameBuffer ( )

virtual

Destructor.

Member Function Documentation

◆ BindBuffer()

virtual void OpenGl_FrameBuffer::BindBuffer ( const Handle< OpenGl_Context > & theGlCtx )

virtual

Bind frame buffer for drawing and reading (to render into the texture).

◆ BindDrawBuffer()

virtual void OpenGl_FrameBuffer::BindDrawBuffer ( const Handle< OpenGl_Context > & theGlCtx )

virtual

Bind frame buffer for drawing GL_DRAW_FRAMEBUFFER (to render into the texture).

◆ BindReadBuffer()

virtual void OpenGl_FrameBuffer::BindReadBuffer ( const Handle< OpenGl_Context > & theGlCtx )

virtual

Bind frame buffer for reading GL_READ_FRAMEBUFFER.

◆ BufferDump()

static Standard_Boolean OpenGl_FrameBuffer::BufferDump	(	const Handle< OpenGl_Context > &	theGlCtx,
		const Handle< OpenGl_FrameBuffer > &	theFbo,
		Image_PixMap &	theImage,
		Graphic3d_BufferType	theBufferType
	)

static

Dump content into image.

Parameters

theGlCtx	bound OpenGL context
theFbo	FBO to dump (or window buffer, if NULL)
theImage	target image
theBufferType	buffer type (attachment) to dump

Returns: TRUE on success

◆ ChangeViewport()

void OpenGl_FrameBuffer::ChangeViewport	(	const GLsizei	theVPSizeX,
		const GLsizei	theVPSizeY
	)

Override viewport settings.

◆ ColorRenderBuffer()

GLuint OpenGl_FrameBuffer::ColorRenderBuffer ( ) const

inline

Returns the color Render Buffer.

◆ ColorTexture()

const Handle< OpenGl_Texture >& OpenGl_FrameBuffer::ColorTexture ( const GLint theColorBufferIndex = 0 ) const

inline

Returns the color texture for the given color buffer index.

◆ DepthStencilRenderBuffer()

GLuint OpenGl_FrameBuffer::DepthStencilRenderBuffer ( ) const

inline

Returns the depth Render Buffer.

◆ DepthStencilTexture()

const Handle< OpenGl_Texture >& OpenGl_FrameBuffer::DepthStencilTexture ( ) const

inline

Returns the depth-stencil texture.

◆ EstimatedDataSize()

virtual Standard_Size OpenGl_FrameBuffer::EstimatedDataSize ( ) const

overridevirtual

Returns estimated GPU memory usage for holding data without considering overheads and allocation alignment rules.

Implements OpenGl_Resource.

◆ getColorDataFormat()

static bool OpenGl_FrameBuffer::getColorDataFormat	(	const Handle< OpenGl_Context > &	theCtx,
		GLint	theTextFormat,
		GLenum &	thePixelFormat,
		GLenum &	theDataType
	)

staticprotected

Determine data type from texture sized format.

◆ getDepthDataFormat()

static bool OpenGl_FrameBuffer::getDepthDataFormat	(	GLint	theTextFormat,
		GLenum &	thePixelFormat,
		GLenum &	theDataType
	)

staticprotected

Determine data type from texture sized format.

◆ GetInitVPSizeX()

GLsizei OpenGl_FrameBuffer::GetInitVPSizeX ( ) const

inline

Viewport width.

◆ GetInitVPSizeY()

GLsizei OpenGl_FrameBuffer::GetInitVPSizeY ( ) const

inline

Viewport height.

◆ GetSizeX()

GLsizei OpenGl_FrameBuffer::GetSizeX ( ) const

inline

Textures width.

◆ GetSizeY()

GLsizei OpenGl_FrameBuffer::GetSizeY ( ) const

inline

Textures height.

◆ GetVPSizeX()

GLsizei OpenGl_FrameBuffer::GetVPSizeX ( ) const

inline

Viewport width.

◆ GetVPSizeY()

GLsizei OpenGl_FrameBuffer::GetVPSizeY ( ) const

inline

Viewport height.

◆ HasColor()

bool OpenGl_FrameBuffer::HasColor ( ) const

inline

Return true if FBO has been created with color attachment.

◆ HasDepth()

bool OpenGl_FrameBuffer::HasDepth ( ) const

inline

Return true if FBO has been created with depth attachment.

◆ Init() [1/3]

Standard_Boolean OpenGl_FrameBuffer::Init	(	const Handle< OpenGl_Context > &	theGlCtx,
		const GLsizei	theSizeX,
		const GLsizei	theSizeY,
		const OpenGl_ColorFormats &	theColorFormats,
		const Handle< OpenGl_Texture > &	theDepthStencilTexture,
		const GLsizei	theNbSamples = `0`
	)

Initialize FBO for rendering into single/multiple color buffer and depth textures.

Parameters

theGlCtx	currently bound OpenGL context
theSizeX	texture width
theSizeY	texture height
theColorFormats	list of color texture sized format (0 means no color attachment), e.g. GL_RGBA8
theDepthStencilTexture	depth-stencil texture
theNbSamples	MSAA number of samples (0 means normal texture)

Returns: true on success

◆ Init() [2/3]

Standard_Boolean OpenGl_FrameBuffer::Init	(	const Handle< OpenGl_Context > &	theGlCtx,
		const GLsizei	theSizeX,
		const GLsizei	theSizeY,
		const GLint	theColorFormat,
		const GLint	theDepthFormat,
		const GLsizei	theNbSamples = `0`
	)

Initialize FBO for rendering into textures.

Parameters

theGlCtx	currently bound OpenGL context
theSizeX	texture width
theSizeY	texture height
theColorFormat	color texture sized format (0 means no color attachment), e.g. GL_RGBA8
theDepthFormat	depth-stencil texture sized format (0 means no depth attachment), e.g. GL_DEPTH24_STENCIL8
theNbSamples	MSAA number of samples (0 means normal texture)

Returns: true on success

◆ Init() [3/3]

Standard_Boolean OpenGl_FrameBuffer::Init	(	const Handle< OpenGl_Context > &	theGlCtx,
		const GLsizei	theSizeX,
		const GLsizei	theSizeY,
		const OpenGl_ColorFormats &	theColorFormats,
		const GLint	theDepthFormat,
		const GLsizei	theNbSamples = `0`
	)

Initialize FBO for rendering into single/multiple color buffer and depth textures.

Parameters

theGlCtx	currently bound OpenGL context
theSizeX	texture width
theSizeY	texture height
theColorFormats	list of color texture sized format (0 means no color attachment), e.g. GL_RGBA8
theDepthFormat	depth-stencil texture sized format (0 means no depth attachment), e.g. GL_DEPTH24_STENCIL8
theNbSamples	MSAA number of samples (0 means normal texture)

Returns: true on success

◆ InitLazy() [1/3]

Standard_Boolean OpenGl_FrameBuffer::InitLazy	(	const Handle< OpenGl_Context > &	theGlCtx,
		const GLsizei	theViewportSizeX,
		const GLsizei	theViewportSizeY,
		const GLint	theColorFormat,
		const GLint	theDepthFormat,
		const GLsizei	theNbSamples = `0`
	)

(Re-)initialize FBO with specified dimensions.

◆ InitLazy() [2/3]

Standard_Boolean OpenGl_FrameBuffer::InitLazy	(	const Handle< OpenGl_Context > &	theGlCtx,
		const GLsizei	theViewportSizeX,
		const GLsizei	theViewportSizeY,
		const OpenGl_ColorFormats &	theColorFormats,
		const GLint	theDepthFormat,
		const GLsizei	theNbSamples = `0`
	)

(Re-)initialize FBO with specified dimensions.

◆ InitLazy() [3/3]

Standard_Boolean OpenGl_FrameBuffer::InitLazy	(	const Handle< OpenGl_Context > &	theGlCtx,
		const OpenGl_FrameBuffer &	theFbo
	)

inline

(Re-)initialize FBO with properties taken from another FBO.

◆ InitWithRB()

Standard_Boolean OpenGl_FrameBuffer::InitWithRB	(	const Handle< OpenGl_Context > &	theGlCtx,
		const GLsizei	theSizeX,
		const GLsizei	theSizeY,
		const GLint	theColorFormat,
		const GLint	theDepthFormat,
		const GLuint	theColorRBufferFromWindow = `0`
	)

(Re-)initialize FBO with specified dimensions. The Render Buffer Objects will be used for Color, Depth and Stencil attachments (as opposite to textures).

Parameters

theGlCtx	currently bound OpenGL context
theSizeX	render buffer width
theSizeY	render buffer height
theColorFormat	color render buffer sized format, e.g. GL_RGBA8
theDepthFormat	depth-stencil render buffer sized format, e.g. GL_DEPTH24_STENCIL8
theColorRBufferFromWindow	when specified - should be ID of already initialized RB object, which will be released within this class

◆ InitWrapper()

Standard_Boolean OpenGl_FrameBuffer::InitWrapper ( const Handle< OpenGl_Context > & theGlCtx )

Initialize class from currently bound FBO. Retrieved OpenGL objects will not be destroyed on Release.

◆ IsValid()

Standard_Boolean OpenGl_FrameBuffer::IsValid ( ) const

inline

Returns true if current object was initialized.

◆ isValidFrameBuffer()

Standard_Boolean OpenGl_FrameBuffer::isValidFrameBuffer ( ) const

inlineprotected

◆ NbColorBuffers()

GLsizei OpenGl_FrameBuffer::NbColorBuffers ( ) const

inline

Number of color buffers.

◆ NbSamples()

GLsizei OpenGl_FrameBuffer::NbSamples ( ) const

inline

Number of multisampling samples.

◆ Release()

virtual void OpenGl_FrameBuffer::Release ( OpenGl_Context * theGlCtx )

overridevirtual

Destroy object - will release GPU memory if any.

Implements OpenGl_Resource.

◆ SetupViewport()

void OpenGl_FrameBuffer::SetupViewport ( const Handle< OpenGl_Context > & theGlCtx )

Setup viewport to render into FBO.

◆ UnbindBuffer()

virtual void OpenGl_FrameBuffer::UnbindBuffer ( const Handle< OpenGl_Context > & theGlCtx )

virtual

Unbind frame buffer.

Field Documentation

◆ myColorFormats

OpenGl_ColorFormats OpenGl_FrameBuffer::myColorFormats

protected

sized format for color texture, GL_RGBA8 by default

◆ myColorTextures

OpenGl_TextureArray OpenGl_FrameBuffer::myColorTextures

protected

color texture objects

◆ myDepthFormat

GLint OpenGl_FrameBuffer::myDepthFormat

protected

sized format for depth-stencil texture, GL_DEPTH24_STENCIL8 by default

◆ myDepthStencilTexture

Handle< OpenGl_Texture > OpenGl_FrameBuffer::myDepthStencilTexture

protected

depth-stencil texture object

◆ myGlColorRBufferId

GLuint OpenGl_FrameBuffer::myGlColorRBufferId

protected

color Render Buffer object (alternative to myColorTexture)

◆ myGlDepthRBufferId

GLuint OpenGl_FrameBuffer::myGlDepthRBufferId

protected

depth-stencil Render Buffer object (alternative to myDepthStencilTexture)

◆ myGlFBufferId

GLuint OpenGl_FrameBuffer::myGlFBufferId

protected

FBO object ID.

◆ myInitVPSizeX

GLsizei OpenGl_FrameBuffer::myInitVPSizeX

protected

viewport width specified during initialization (kept even on failure)

◆ myInitVPSizeY

GLsizei OpenGl_FrameBuffer::myInitVPSizeY

protected

viewport height specified during initialization (kept even on failure)

◆ myIsOwnBuffer

bool OpenGl_FrameBuffer::myIsOwnBuffer

protected

flag indicating that FBO should be deallocated by this class

◆ myIsOwnDepth

bool OpenGl_FrameBuffer::myIsOwnDepth

protected

flag indicating that FBO should be deallocated by this class

◆ myNbSamples

GLsizei OpenGl_FrameBuffer::myNbSamples

protected

number of MSAA samples

◆ myVPSizeX

GLsizei OpenGl_FrameBuffer::myVPSizeX

protected

viewport width (should be <= texture width)

◆ myVPSizeY

GLsizei OpenGl_FrameBuffer::myVPSizeY

protected

viewport height (should be <= texture height)

◆ NO_FRAMEBUFFER

const GLuint OpenGl_FrameBuffer::NO_FRAMEBUFFER = 0

static

Helpful constants.

◆ NO_RENDERBUFFER

const GLuint OpenGl_FrameBuffer::NO_RENDERBUFFER = 0

static

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

OpenGl_FrameBuffer.hxx

OpenGl_FrameBuffer Class Reference

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Types

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ OpenGl_TextureArray

Constructor & Destructor Documentation

◆ OpenGl_FrameBuffer()

◆ ~OpenGl_FrameBuffer()

Member Function Documentation

◆ BindBuffer()

◆ BindDrawBuffer()

◆ BindReadBuffer()

◆ BufferDump()

◆ ChangeViewport()

◆ ColorRenderBuffer()

◆ ColorTexture()

◆ DepthStencilRenderBuffer()

◆ DepthStencilTexture()

◆ EstimatedDataSize()

◆ getColorDataFormat()

◆ getDepthDataFormat()

◆ GetInitVPSizeX()

◆ GetInitVPSizeY()

◆ GetSizeX()

◆ GetSizeY()

◆ GetVPSizeX()

◆ GetVPSizeY()

◆ HasColor()

◆ HasDepth()

◆ Init() [1/3]

◆ Init() [2/3]

◆ Init() [3/3]

◆ InitLazy() [1/3]

◆ InitLazy() [2/3]

◆ InitLazy() [3/3]

◆ InitWithRB()

◆ InitWrapper()

◆ IsValid()

◆ isValidFrameBuffer()

◆ NbColorBuffers()

◆ NbSamples()

◆ Release()

◆ SetupViewport()

◆ UnbindBuffer()

Field Documentation

◆ myColorFormats

◆ myColorTextures

◆ myDepthFormat

◆ myDepthStencilTexture

◆ myGlColorRBufferId

◆ myGlDepthRBufferId

◆ myGlFBufferId

◆ myInitVPSizeX

◆ myInitVPSizeY

◆ myIsOwnBuffer

◆ myIsOwnDepth

◆ myNbSamples

◆ myVPSizeX

◆ myVPSizeY

◆ NO_FRAMEBUFFER

◆ NO_RENDERBUFFER