eq::util::Accum Class Reference

A C++ class to abstract an accumulation buffer. More...

#include <accum.h>

Collaboration diagram for eq::util::Accum:

List of all members.

Public Member Functions
	Accum (const GLEWContext *const glewContext)
	Construct a new accumulation buffer.
	~Accum ()
	Destruct the accumulation buffer.
bool	init (const PixelViewport &pvp, GLuint textureFormat)
	Initialize the accumulation buffer.
void	exit ()
	Exit the accum buffer.
bool	resize (const int width, const int height)
	Resize the accumulation buffer.
void	clear ()
	Clear the accumulation buffer.
void	accum ()
	Accumulate a frame from the read buffer into the accumulation buffer.
void	display ()
	Copy the result of the accumulation to the current draw buffer.
uint32_t	getMaxSteps () const
	Get the maximum number of accumulation steps possible.
uint32_t	getNumSteps () const
	Get the current number of accumulation steps done.
void	setTotalSteps (uint32_t totalSteps)
	Set the total number of accumulation steps that will be done.
uint32_t	getTotalSteps ()
bool	usesFBO () const
	Test if the accumulation uses the FBO implementation.
const GLEWContext *	glewGetContext () const
Static Public Member Functions
static bool	usesFBO (const GLEWContext *glewContext)

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Detailed Description

A C++ class to abstract an accumulation buffer.

Depending on the OpenGL version, an FBO or glAccum() is used.

Remark: MacOS systems seem to have a buggy implementation of glAccum(), and use a workaround which needs setTotalSteps() to set up the total number of accumulations done.

Definition at line 40 of file accum.h.

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Constructor & Destructor Documentation

eq::util::Accum::Accum

(

const GLEWContext *const

glewContext

)

Construct a new accumulation buffer.

Version:

1.0

Definition at line 23 of file accum.cpp.

eq::util::Accum::~Accum

(

)

Destruct the accumulation buffer.

Version:

1.0

Definition at line 34 of file accum.cpp.

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Member Function Documentation

void eq::util::Accum::accum

(

)

Accumulate a frame from the read buffer into the accumulation buffer.

Version:

1.0

Definition at line 97 of file accum.cpp.

Referenced by eq::Compositor::assembleFramesSorted(), and eq::Compositor::assembleFramesUnsorted().

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void eq::util::Accum::clear

(

)

Clear the accumulation buffer.

Version:

1.0

Definition at line 72 of file accum.cpp.

Referenced by eq::Compositor::assembleFramesSorted(), and eq::Compositor::assembleFramesUnsorted().

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void eq::util::Accum::display

(

)

Copy the result of the accumulation to the current draw buffer.

Version:

1.0

Definition at line 129 of file accum.cpp.

Referenced by eq::Compositor::assembleFramesSorted(), and eq::Compositor::assembleFramesUnsorted().

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void eq::util::Accum::exit

(

)

Exit the accum buffer.

Version:

1.0

Definition at line 61 of file accum.cpp.

Referenced by init().

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uint32_t eq::util::Accum::getMaxSteps

(

)

const

Get the maximum number of accumulation steps possible.

Returns:

the maximum number of steps.

Version:

1.0

Definition at line 149 of file accum.cpp.

uint32_t eq::util::Accum::getNumSteps

(

)

const [inline]

Get the current number of accumulation steps done.

Returns:

the number of steps done.

Version:

1.0

Definition at line 101 of file accum.h.

uint32_t eq::util::Accum::getTotalSteps

(

)

[inline]

Returns:

the total number of accumulations.

Version:

1.0

Definition at line 116 of file accum.h.

bool eq::util::Accum::init	(	const PixelViewport &	pvp,
		GLuint	textureFormat
	)

Initialize the accumulation buffer.

Parameters:

	pvp	the pixel viewport.
	textureFormat	the texture format.

Returns:

true if initialized successfully.

Version:

1.0

Definition at line 39 of file accum.cpp.

References exit().

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bool eq::util::Accum::resize	(	const int	width,
		const int	height
	)

Resize the accumulation buffer.

Parameters:

	width	the new width.
	height	the new height.

Returns:

true if the accumulation buffer is correctly resized.

Version:

1.0

Definition at line 77 of file accum.cpp.

void eq::util::Accum::setTotalSteps

(

uint32_t

totalSteps

)

[inline]

Set the total number of accumulation steps that will be done.

This is used only for Darwin systems due to a specific glAccum() workaround.

Parameters:

totalSteps

the total number of steps to do.

Version:

1.0

Definition at line 112 of file accum.h.

Referenced by eq::Compositor::assembleFramesSorted(), and eq::Compositor::assembleFramesUnsorted().

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bool eq::util::Accum::usesFBO

(

)

const

Test if the accumulation uses the FBO implementation.

Returns:

true if the accumulation uses an FBO, false if it uses glAccum().

Definition at line 160 of file accum.cpp.

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

• accum.h
• accum.cpp