juce::OpenGLFrameBuffer Class Reference

Creates an openGL frame buffer. More...

#include <juce_OpenGLFrameBuffer.h>

Collaboration diagram for juce::OpenGLFrameBuffer:

Public Member Functions
	OpenGLFrameBuffer ()
	Creates an uninitialised buffer. More...
	~OpenGLFrameBuffer ()
	Destructor. More...
void	clear (Colour colour)
	Clears the framebuffer with the specified colour. More...
GLuint	getFrameBufferID () const noexcept
	Returns the ID of this framebuffer, or 0 if it isn't initialised. More...
int	getHeight () const noexcept
	Returns the height of the buffer. More...
GLuint	getTextureID () const noexcept
	Returns the texture ID number for using this buffer as a texture. More...
int	getWidth () const noexcept
	Returns the width of the buffer. More...
bool	initialise (OpenGLContext &context, int width, int height)
	Tries to allocates a buffer of the given size. More...
bool	initialise (OpenGLContext &context, const Image &content)
	Tries to allocates a buffer containing a copy of a given image. More...
bool	initialise (OpenGLFrameBuffer &other)
	Tries to allocate a copy of another framebuffer. More...
bool	isValid () const noexcept
	Returns true if a valid buffer has been allocated. More...
void	makeCurrentAndClear ()
	Selects the framebuffer as the current target, and clears it to transparent. More...
bool	makeCurrentRenderingTarget ()
	Selects this buffer as the current OpenGL rendering target. More...
bool	readPixels (PixelARGB *targetData, const Rectangle< int > &sourceArea)
	Reads an area of pixels from the framebuffer into a 32-bit ARGB pixel array. More...
void	release ()
	Releases the buffer, if one has been allocated. More...
void	releaseAsRenderingTarget ()
	Deselects this buffer as the current OpenGL rendering target. More...
bool	reloadSavedCopy (OpenGLContext &context)
	Restores the framebuffer content that was previously saved using saveAndRelease(). More...
void	saveAndRelease ()
	If the framebuffer is active, this will save a stashed copy of its contents in main memory, and will release the GL buffer. More...
bool	writePixels (const PixelARGB *srcData, const Rectangle< int > &targetArea)
	Writes an area of pixels into the framebuffer from a specified pixel array. More...

Static Public Member Functions
static GLuint	getCurrentFrameBufferTarget () noexcept
	Returns the current frame buffer ID for the current context. More...

Private Attributes
std::unique_ptr< Pimpl >	pimpl
std::unique_ptr< SavedState >	savedState

Detailed Description

Creates an openGL frame buffer.

{OpenGL}

Constructor & Destructor Documentation

OpenGLFrameBuffer()

juce::OpenGLFrameBuffer::OpenGLFrameBuffer

(

)

Creates an uninitialised buffer.

To actually allocate the buffer, use initialise().

~OpenGLFrameBuffer()

juce::OpenGLFrameBuffer::~OpenGLFrameBuffer

(

)

Destructor.

Member Function Documentation

clear()

void juce::OpenGLFrameBuffer::clear

(

Colour

colour

)

Clears the framebuffer with the specified colour.

getCurrentFrameBufferTarget()

static GLuint juce::OpenGLFrameBuffer::getCurrentFrameBufferTarget ( )

staticnoexcept

Returns the current frame buffer ID for the current context.

getFrameBufferID()

GLuint juce::OpenGLFrameBuffer::getFrameBufferID ( ) const

noexcept

Returns the ID of this framebuffer, or 0 if it isn't initialised.

getHeight()

int juce::OpenGLFrameBuffer::getHeight ( ) const

noexcept

Returns the height of the buffer.

getTextureID()

GLuint juce::OpenGLFrameBuffer::getTextureID ( ) const

noexcept

Returns the texture ID number for using this buffer as a texture.

getWidth()

int juce::OpenGLFrameBuffer::getWidth ( ) const

noexcept

Returns the width of the buffer.

initialise() [1/3]

bool juce::OpenGLFrameBuffer::initialise	(	OpenGLContext &	context,
		int	width,
		int	height
	)

Tries to allocates a buffer of the given size.

Note that a valid openGL context must be selected when you call this method, or it will fail.

initialise() [2/3]

bool juce::OpenGLFrameBuffer::initialise	(	OpenGLContext &	context,
		const Image &	content
	)

Tries to allocates a buffer containing a copy of a given image.

Note that a valid openGL context must be selected when you call this method, or it will fail.

initialise() [3/3]

bool juce::OpenGLFrameBuffer::initialise

(

OpenGLFrameBuffer &

other

)

Tries to allocate a copy of another framebuffer.

isValid()

bool juce::OpenGLFrameBuffer::isValid ( ) const

inlinenoexcept

Returns true if a valid buffer has been allocated.

makeCurrentAndClear()

void juce::OpenGLFrameBuffer::makeCurrentAndClear

(

)

Selects the framebuffer as the current target, and clears it to transparent.

makeCurrentRenderingTarget()

bool juce::OpenGLFrameBuffer::makeCurrentRenderingTarget

(

)

Selects this buffer as the current OpenGL rendering target.

readPixels()

bool juce::OpenGLFrameBuffer::readPixels	(	PixelARGB *	targetData,
		const Rectangle< int > &	sourceArea
	)

Reads an area of pixels from the framebuffer into a 32-bit ARGB pixel array.

The lineStride is measured as a number of pixels, not bytes - pass a stride of 0 to indicate a packed array.

release()

void juce::OpenGLFrameBuffer::release

(

)

Releases the buffer, if one has been allocated.

Any saved state that was created with saveAndRelease() will also be freed by this call.

releaseAsRenderingTarget()

void juce::OpenGLFrameBuffer::releaseAsRenderingTarget

(

)

Deselects this buffer as the current OpenGL rendering target.

reloadSavedCopy()

bool juce::OpenGLFrameBuffer::reloadSavedCopy

(

OpenGLContext &

context

)

Restores the framebuffer content that was previously saved using saveAndRelease().

After saving to main memory, the original state can be restored by calling restoreToGPUMemory().

saveAndRelease()

void juce::OpenGLFrameBuffer::saveAndRelease

(

)

If the framebuffer is active, this will save a stashed copy of its contents in main memory, and will release the GL buffer.

After saving, the original state can be restored again by calling reloadSavedCopy().

writePixels()

bool juce::OpenGLFrameBuffer::writePixels	(	const PixelARGB *	srcData,
		const Rectangle< int > &	targetArea
	)

Writes an area of pixels into the framebuffer from a specified pixel array.

The lineStride is measured as a number of pixels, not bytes - pass a stride of 0 to indicate a packed array.

Member Data Documentation

pimpl

std::unique_ptr<Pimpl> juce::OpenGLFrameBuffer::pimpl

private

savedState

std::unique_ptr<SavedState> juce::OpenGLFrameBuffer::savedState

private

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

• juce_OpenGLFrameBuffer.h