Texture implementation for the OpenGLRenderer. More...

Inheritance diagram for CEGUI::OpenGLTexture:

Collaboration diagram for CEGUI::OpenGLTexture:

Public Member Functions
void	setOpenGLTexture (GLuint tex, const Sizef &size)
	set the openGL texture that this Texture is based on to the specified texture, with the specified size.

GLuint	getOpenGLTexture () const
	Return the internal OpenGL texture id used by this Texture object. More...

void	setTextureSize (const Sizef &sz)
	set the size of the internal texture. More...

void	grabTexture ()
	Grab the texture to a local buffer. More...

void	restoreTexture ()
	Restore the texture from the locally buffered copy previously create by a call to grabTexture.

const String &	getName () const
	Returns the name given to the texture when it was created. More...

const Sizef &	getSize () const
	Returns the current pixel size of the texture. More...

const Sizef &	getOriginalDataSize () const
	Returns the original pixel size of the data loaded into the texture. More...

const Vector2f &	getTexelScaling () const
	Returns pixel to texel scale values that should be used for converting pixel values to texture co-ords. More...

void	loadFromFile (const String &filename, const String &resourceGroup)
	Loads the specified image file into the texture. The texture is resized as required to hold the image. More...

void	loadFromMemory (const void *buffer, const Sizef &buffer_size, PixelFormat pixel_format)
	Loads (copies) an image in memory into the texture. The texture is resized as required to hold the image. More...

void	blitFromMemory (const void *sourceData, const Rectf &area)
	Performs an area memory blit to the texture. More...

void	blitToMemory (void *targetData)
	Performs a complete blit from the texture surface to memory. More...

bool	isPixelFormatSupported (const PixelFormat fmt) const
	Return whether the specified pixel format is supported by the system for the CEGUI::Texture implementation. More...

Public Member Functions inherited from CEGUI::Texture
virtual	~Texture ()
	Destructor for Texture base class.

Protected Member Functions
	OpenGLTexture (OpenGLRendererBase &owner, const String &name)
	Basic constructor.

	OpenGLTexture (OpenGLRendererBase &owner, const String &name, const String &filename, const String &resourceGroup)
	Constructor that creates a Texture from an image file.

	OpenGLTexture (OpenGLRendererBase &owner, const String &name, const Sizef &size)
	Constructor that creates a Texture with a given size.

	OpenGLTexture (OpenGLRendererBase &owner, const String &name, GLuint tex, const Sizef &size)
	Constructor that wraps an existing GL texture.

virtual	~OpenGLTexture ()
	Destructor.

void	generateOpenGLTexture ()
	generate the OpenGL texture and set some initial options.

void	updateCachedScaleValues ()
	updates cached scale value used to map pixels to texture co-ords.

void	cleanupOpenGLTexture ()
	clean up the GL texture, or the grab buffer if it had been grabbed

GLint	internalFormat () const

void	initInternalPixelFormatFields (const PixelFormat fmt)
	initialise the internal format flags for the given CEGUI::PixelFormat.

void	setTextureSize_impl (const Sizef &sz)
	internal texture resize function (does not reset format or other fields)

void	loadUncompressedTextureBuffer (const Rectf &dest_area, const GLvoid *buffer) const

void	loadCompressedTextureBuffer (const Rectf &dest_area, const GLvoid *buffer) const

GLsizei	getCompressedTextureSize (const Sizef &pixel_size) const

Protected Attributes
GLuint	d_ogltexture
	The OpenGL texture we're wrapping.

Sizef	d_size
	Size of the texture.

uint8 *	d_grabBuffer
	cached image data for restoring the texture.

Sizef	d_dataSize
	original size of pixel data loaded into texture

Vector2f	d_texelScaling
	cached pixel to texel mapping scale values.

OpenGLRendererBase &	d_owner
	OpenGLRenderer that created and owns this OpenGLTexture.

const String	d_name
	The name given for this texture.

GLenum	d_format
	Texture format.

GLenum	d_subpixelFormat
	Texture subpixel format.

bool	d_isCompressed
	Whether Texture format is a compressed format.

Friends
Texture &	OpenGLRendererBase::createTexture (const String &)

Texture &	OpenGLRendererBase::createTexture (const String &, const String &, const String &)

Texture &	OpenGLRendererBase::createTexture (const String &, const Sizef &)

Texture &	OpenGLRendererBase::createTexture (const String &, GLuint, const Sizef &)

void	OpenGLRendererBase::destroyTexture (Texture &)

void	OpenGLRendererBase::destroyTexture (const String &)

Additional Inherited Members
Public Types inherited from CEGUI::Texture
enum	PixelFormat { PF_RGB, PF_RGBA, PF_RGBA_4444, PF_RGB_565, PF_PVRTC2, PF_PVRTC4, PF_RGB_DXT1, PF_RGBA_DXT1, PF_RGBA_DXT3, PF_RGBA_DXT5 }
	Enumerated type containing the supported pixel formats that can be passed to loadFromMemory. More...

Detailed Description

Texture implementation for the OpenGLRenderer.

Member Function Documentation

void CEGUI::OpenGLTexture::blitFromMemory	(	const void *	sourceData,
		const Rectf &	area
	)

virtual

Performs an area memory blit to the texture.

Parameters

sourceData	input data, the size must match area described by the given Rect
area	area where the blit will happen

Note: The pixel format must match current Texture's pixel format!

Implements CEGUI::Texture.

void CEGUI::OpenGLTexture::blitToMemory ( void * targetData )

virtual

Performs a complete blit from the texture surface to memory.

Parameters

targetData the buffer where the target is stored

Note: You have to (correctly) preallocate the target buffer!

Implements CEGUI::Texture.

const String& CEGUI::OpenGLTexture::getName ( ) const

virtual

Returns the name given to the texture when it was created.

Returns: Reference to a String object that holds the name of the texture.

Implements CEGUI::Texture.

GLuint CEGUI::OpenGLTexture::getOpenGLTexture ( ) const

Return the internal OpenGL texture id used by this Texture object.

Returns: id of the OpenGL texture that this object is using.

const Sizef& CEGUI::OpenGLTexture::getOriginalDataSize ( ) const

virtual

Returns the original pixel size of the data loaded into the texture.

Returns: reference to a Size object that describes the original size, in pixels, of the data loaded into the texture.

Implements CEGUI::Texture.

const Sizef& CEGUI::OpenGLTexture::getSize ( ) const

virtual

Returns the current pixel size of the texture.

Returns: Reference to a Size object that describes the size of the texture in pixels.

Implements CEGUI::Texture.

const Vector2f& CEGUI::OpenGLTexture::getTexelScaling ( ) const

virtual

Returns pixel to texel scale values that should be used for converting pixel values to texture co-ords.

Returns: Reference to a Vector2 object that describes the scaling values required to accurately map pixel positions to texture co-ordinates.

Implements CEGUI::Texture.

void CEGUI::OpenGLTexture::grabTexture ( )

Grab the texture to a local buffer.

This will destroy the OpenGL texture, and restoreTexture must be called before using it again.

bool CEGUI::OpenGLTexture::isPixelFormatSupported ( const PixelFormat fmt ) const

virtual

Return whether the specified pixel format is supported by the system for the CEGUI::Texture implementation.

The result of this call will vary according to the implementaion API and the capabilities of the hardware.

Note: Whether the CEGUI system as a whole will make use of support for any given pixel format will depend upon that format being recognised and supported by both the renderer module implementation and the ImageCodec module that is used to load texture data.

Parameters

fmt	One of the PixelFormat enumerated values specifying the pixel format that is to be tested.

Returns

true if the specified PixelFormat is supported.
false if the specified PixelFormat is not supported.

Implements CEGUI::Texture.

void CEGUI::OpenGLTexture::loadFromFile	(	const String &	filename,
		const String &	resourceGroup
	)

virtual

Loads the specified image file into the texture. The texture is resized as required to hold the image.

Parameters

filename	The filename of the image file that is to be loaded into the texture
resourceGroup	Resource group identifier to be passed to the resource provider when loading the image file.

Returns: Nothing.

Implements CEGUI::Texture.

void CEGUI::OpenGLTexture::loadFromMemory	(	const void *	buffer,
		const Sizef &	buffer_size,
		PixelFormat	pixel_format
	)

virtual

Loads (copies) an image in memory into the texture. The texture is resized as required to hold the image.

Parameters

buffer	Pointer to the buffer containing the image data.
buffer_size	Size of the buffer (in pixels as specified by pixelFormat)
pixel_format	PixelFormat value describing the format contained in buffPtr.

Returns: Nothing.

Implements CEGUI::Texture.

void CEGUI::OpenGLTexture::setTextureSize ( const Sizef & sz )

set the size of the internal texture.

Parameters

sz	size for the internal texture, in pixels.

Note: Depending upon the hardware capabilities, the actual final size of the texture may be larger than what is specified when calling this function. The texture will never be smaller than what you request here. To discover the actual size, call getSize.

Exceptions

RendererException thrown if the hardware is unable to support a texture large enough to fulfill the requested size.

Returns: Nothing.

Public Member Functions

Protected Member Functions

Protected Attributes

Friends

Additional Inherited Members

Detailed Description

Member Function Documentation