eq::util::AccumBufferObject Class Reference

A class to emulate an OpenGL accumulation buffer using an FBO. More...

#include <accumBufferObject.h>

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List of all members.

Public Member Functions
	AccumBufferObject (GLEWContext *const glewContext)
	Construct a new Accumulation Buffer Object.
	~AccumBufferObject ()
	Destruct the Accumulation Buffer Object.
bool	init (const PixelViewport &pvp, GLuint format)
	Initialize the Accumulation Buffer Object.
void	exit ()
	De-initialize the Accumulation Buffer Object.
void	load (GLfloat value)
	Load the current read buffer into the accumulation buffer.
void	accum (GLfloat value)
	Accumulate the current read buffer into the accumulation buffer.
void	display (GLfloat value)
	Transfers accumulation buffer values to the write buffer.

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Detailed Description

A class to emulate an OpenGL accumulation buffer using an FBO.

See also:

glAccum()

Definition at line 34 of file accumBufferObject.h.

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Member Function Documentation

bool eq::util::AccumBufferObject::init	(	const PixelViewport &	pvp,
		GLuint	format
	)

Initialize the Accumulation Buffer Object.

The ABO uses a 32-bit float texture.

Parameters:

	width	the initial width of the rendering buffer.
	height	the initial height of the rendering buffer.
	format	the texture format corresponding to the source color read buffer.

Returns:

true on success, false otherwise

See also:

Window::getColorFormat(), glReadBuffer()

Definition at line 38 of file accumBufferObject.cpp.

References exit(), eq::util::FrameBufferObject::init(), eq::util::FrameBufferObject::setColorFormat(), eq::util::Texture::setFormat(), and eq::util::FrameBufferObject::unbind().

Referenced by eq::util::Accum::init().

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void eq::util::AccumBufferObject::exit

(

)

De-initialize the Accumulation Buffer Object.

Reimplemented from eq::util::FrameBufferObject.

Definition at line 56 of file accumBufferObject.cpp.

References eq::util::Texture::flush().

Referenced by eq::util::Accum::exit(), init(), and ~AccumBufferObject().

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void eq::util::AccumBufferObject::load

(

GLfloat

value

)

Load the current read buffer into the accumulation buffer.

The values of the current read buffer are multiplied with value and copied into the accumulation buffer.

Parameters:

value

a floating-point value multiplying the source values during the load operation.

Definition at line 67 of file accumBufferObject.cpp.

References eq::util::FrameBufferObject::bind(), eq::util::Texture::copyFromFrameBuffer(), eq::util::FrameBufferObject::getPixelViewport(), and eq::util::FrameBufferObject::unbind().

Referenced by eq::util::Accum::accum().

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void eq::util::AccumBufferObject::accum

(

GLfloat

value

)

Accumulate the current read buffer into the accumulation buffer.

The read buffer is multiplied by value and added to the accumulation buffer.

Parameters:

value

a floating-point value multiplying the source values during the accum operation.

Definition at line 78 of file accumBufferObject.cpp.

References eq::util::FrameBufferObject::bind(), eq::util::Texture::copyFromFrameBuffer(), eq::util::FrameBufferObject::getPixelViewport(), and eq::util::FrameBufferObject::unbind().

Referenced by eq::util::Accum::accum().

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void eq::util::AccumBufferObject::display

(

GLfloat

value

)

Transfers accumulation buffer values to the write buffer.

Each accumulation buffer is multiplied by value during the transfer.

Parameters:

value

a floating-point value multiplying the accumulation values during the operation.

Definition at line 93 of file accumBufferObject.cpp.

References eq::util::FrameBufferObject::getColorTextures().

Referenced by eq::util::Accum::display().

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

• accumBufferObject.h
• accumBufferObject.cpp