eq::util::AccumBufferObject Class Reference

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

#include <accumBufferObject.h>

Inheritance diagram for eq::util::AccumBufferObject:

Collaboration diagram for eq::util::AccumBufferObject:

List of all members.

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

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Detailed Description

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

See also:

glAccum(), eq::util::Accum

Definition at line 36 of file accumBufferObject.h.

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Constructor & Destructor Documentation

eq::util::AccumBufferObject::AccumBufferObject

(

const GLEWContext *const

glewContext

)

Construct a new Accumulation Buffer Object.

Version:

1.0

eq::util::AccumBufferObject::~AccumBufferObject

(

)

Destruct the Accumulation Buffer Object.

Version:

1.0

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Member Function Documentation

void eq::util::AccumBufferObject::accum

(

const GLfloat

value

)

Accumulate the current read buffer into the accumulation buffer.

The color values of the current read buffer are multiplied by value and added to the accumulation buffer.

Parameters:

value

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

Version:

1.0

void eq::util::AccumBufferObject::display

(

const GLfloat

value

)

Transfer accumulation buffer values to the draw buffer.

The accumulation buffer color values are multiplied by value, and copied into the current draw buffer.

Parameters:

value

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

Version:

1.0

void eq::util::AccumBufferObject::exit

(

)

De-initialize the Accumulation Buffer Object.

Version:

1.0

Reimplemented from eq::util::FrameBufferObject.

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

Initialize the Accumulation Buffer Object.

The ABO uses a 32-bit float texture for the accumulation.

Parameters:

pvp	the initial pixel viewport 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()

Version:

1.0

void eq::util::AccumBufferObject::load

(

const GLfloat

value

)

Load the current read buffer into the accumulation buffer.

The color 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.

Version:

1.0

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

• accumBufferObject.h