eq::Channel Class Reference

A channel represents a two-dimensional viewport within a Window. More...

#include <channel.h>

Inheritance diagram for eq::Channel:

Collaboration diagram for eq::Channel:

Public Member Functions
EQ_API	Channel (Window *parent)
	Construct a new channel. More...
virtual EQ_API	~Channel ()
	Destruct the channel. More...
virtual EQ_API void	drawStatistics ()
	Draw a statistics overlay. More...
virtual EQ_API void	outlineViewport ()
	Outline the current pixel viewport. More...
void	changeLatency (const uint32_t latency)
EQ_API void	addResultImageListener (ResultImageListener *listener)
	Add a listener that gets notified everytime a new frame was rendered for a destination channel. More...
EQ_API void	removeResultImageListener (ResultImageListener *listener)
	Remove a result image listener to stop receival of notifications on new images. More...
virtual EQ_API std::string	getDumpImageFileName () const
Data Access
EQ_API co::CommandQueue *	getPipeThreadQueue ()
EQ_API co::CommandQueue *	getCommandThreadQueue ()
EQ_API uint32_t	getCurrentFrame () const
bool	waitFrameFinished (uint32_t frame, uint32_t timeout) const
EQ_API bool	isStopped () const
EQ_API Pipe *	getPipe ()
EQ_API const Pipe *	getPipe () const
EQ_API Node *	getNode ()
EQ_API const Node *	getNode () const
EQ_API Config *	getConfig ()
EQ_API const Config *	getConfig () const
EQ_API ServerPtr	getServer ()
EQ_API const GLEWContext *	glewGetContext () const
	Get the GLEW context for this channel. More...
EQ_API util::ObjectManager &	getObjectManager ()
EQ_API const DrawableConfig &	getDrawableConfig () const
EQ_API View *	getNativeView ()
	Get the channel's native view. More...
EQ_API const View *	getNativeView () const
	const-version of getNativeView() More...
EQ_API const Vector3ub &	getUniqueColor () const
EQ_API void	addStatistic (Event &event)
Context-specific data access.
The data returned by these methods depends on the context (callback) they are called from, typically the data for the current rendering task. If they are called outside of a frame task method, they return the channel's native parameter or a placeholder value for the task decomposition parameters.
virtual EQ_API Vector2f	getJitter () const
EQ_API View *	getView ()
	Get the channel's current View. More...
EQ_API const View *	getView () const
	Const version of getView(). More...
EQ_API Frustumf	getScreenFrustum () const
	Returns an orthographic frustum for 2D operations on the view. More...
Operations
Operations are only meaningful from within certain callbacks. They are just convenience wrappers applying context-specific data to the OpenGL state using the context-specific data access above.
virtual EQ_API void	applyBuffer ()
	Apply the current rendering buffer, including the color mask. More...
virtual EQ_API void	applyColorMask () const
	Apply the current color mask. More...
virtual EQ_API void	applyViewport () const
	Apply the OpenGL viewport for the current rendering task. More...
virtual EQ_API void	applyFrustum () const
	Apply the frustum matrix for the current rendering task. More...
virtual EQ_API void	applyPerspective () const
	Apply the perspective frustum matrix for the current rendering task. More...
virtual EQ_API void	applyOrtho () const
	Apply the orthographic frustum matrix for the current rendering task. More...
EQ_API void	applyScreenFrustum () const
	Apply an orthographic frustum for pixel-based 2D operations. More...
virtual EQ_API void	applyHeadTransform () const
	Apply the transformation to position the view frustum. More...
virtual EQ_API void	applyPerspectiveTransform () const
	Apply the transformation to position the perspective view frustum. More...
virtual EQ_API void	applyOrthoTransform () const
	Apply the transformation to position the orthographic view frustum. More...
EQ_API void	bindFrameBuffer ()
	Rebind the window frame buffer. More...
EQ_API void	bindDrawFrameBuffer ()
	Rebind the window draw buffer. More...
Region of Interest.
virtual EQ_API void	resetRegions ()
	Reset the declared regions of interest. More...
virtual EQ_API void	declareRegion (const eq::PixelViewport &region)
	Declare a region covered by the current draw or assemble operation. More...
EQ_API void	declareRegion (const eq::Viewport &vp)
	Convenience method to declare a region in relative coordinates. More...
EQ_API PixelViewport	getRegion () const
EQ_API const PixelViewports &	getRegions () const
	Get the current regions of interest. More...
Events
EQ_API EventOCommand	sendError (const uint32_t error)
	Send a channel error event to the application node. More...
virtual EQ_API bool	processEvent (const Event &event)
	Process a received event. More...
Public Member Functions inherited from eq::fabric::Channel< Window, Channel >
virtual bool	omitOutput () const
virtual void	output (std::ostream &) const
void	init ()
Window *	getWindow ()
const Window *	getWindow () const
bool	isDestination () const
void	setViewVersion (const co::ObjectVersion &view)
const co::ObjectVersion &	getViewVersion () const
void	setPixelViewport (const PixelViewport &pvp)
EQFABRIC_INL void	setViewport (const Viewport &vp)
const PixelViewport &	getNativePixelViewport () const
bool	hasFixedViewport () const
EQFABRIC_INL void	setNearFar (const float nearPlane, const float farPlane)
	Set the near and far planes for this channel. More...
EQFABRIC_INL VisitorResult	accept (Visitor &visitor)
	Perform a depth-first traversal of this channel. More...
EQFABRIC_INL VisitorResult	accept (Visitor &visitor) const
	Const-version of accept(). More...
EQFABRIC_INL void	setCapabilities (const uint64_t bitmask)
	Set the capabilities supported by the channel. More...
EQFABRIC_INL uint64_t	getCapabilities () const
EQFABRIC_INL void	setMaxSize (const Vector2i &size)
void	setOverdraw (const Vector4i &overdraw)
const Vector2i &	getMaxSize () const
EQFABRIC_INL ChannelPath	getPath () const
virtual EQFABRIC_INL void	backup ()
virtual EQFABRIC_INL void	restore ()
uint32_t	getDrawBuffer () const
uint32_t	getReadBuffer () const
const ColorMask &	getDrawBufferMask () const
const PixelViewport &	getPixelViewport () const
virtual bool	useOrtho () const
	Select perspective or orthographic rendering. More...
const Frustumf &	getFrustum () const
const Frustumf &	getPerspective () const
const Frustumf &	getOrtho () const
const Matrix4f &	getHeadTransform () const
	Return the view matrix. More...
const Matrix4f &	getPerspectiveTransform () const
	Return the perspective view matrix. More...
const Matrix4f &	getOrthoTransform () const
	Return the orthographic view matrix. More...
const Viewport &	getViewport () const
const Range &	getRange () const
const Pixel &	getPixel () const
const SubPixel &	getSubPixel () const
const Zoom &	getZoom () const
uint32_t	getPeriod () const
uint32_t	getPhase () const
const Vector2i &	getPixelOffset () const
	Get the channel's current position wrt the destination channel. More...
Eye	getEye () const
const Vector4i &	getOverdraw () const
uint32_t	getTaskID () const
EQFABRIC_INL int32_t	getIAttribute (const IAttribute attr) const
EQFABRIC_INL const std::string &	getSAttribute (const SAttribute attr) const
Public Member Functions inherited from eq::fabric::Object
virtual EQFABRIC_API bool	isDirty () const
virtual EQFABRIC_API uint128_t	commit (const uint32_t incarnation=CO_COMMIT_NEXT)
virtual EQFABRIC_API void	setName (const std::string &name)
	Set the name of the object. More...
EQFABRIC_API const std::string &	getName () const
EQFABRIC_API void	setUserData (co::Object *userData)
	Set user-specific data. More...
EQFABRIC_API co::Object *	getUserData ()
EQFABRIC_API const co::Object *	getUserData () const
EQFABRIC_API uint32_t	getTasks () const
	Return the set of tasks this channel might execute in the worst case. More...
EQFABRIC_API uint32_t	getSerial () const

Protected Member Functions
EQ_API void	attach (const uint128_t &id, const uint32_t instanceID)
virtual void	frameTilesStart (const uint128_t &)
	Start a batch of tile rendering operations. More...
virtual void	frameTilesFinish (const uint128_t &)
	Finish a batch of tile rendering operations. More...
virtual EQ_API void	notifyViewportChanged ()
	Notification that parameters influencing the vp/pvp have changed. More...
virtual EQ_API void	notifyStopFrame (const uint32_t lastFrameNumber)
	Notify interruption of the rendering. More...
Actions
EQ_API void	startFrame (const uint32_t frameNumber)
	Start a frame by unlocking all child resources. More...
EQ_API void	releaseFrame (const uint32_t frameNumber)
	Signal the completion of a frame to the parent. More...
EQ_API void	releaseFrameLocal (const uint32_t frameNumber)
	Release the local synchronization of the parent for a frame. More...
virtual EQ_API void	setupAssemblyState ()
	Setup the OpenGL state for a readback or assemble operation. More...
virtual EQ_API void	resetAssemblyState ()
	Reset the OpenGL state after an assembly operation. More...
Task Methods
The task methods (callbacks) are called by Equalizer during rendering to execute various rendering tasks. Each task method has a useful default implementation, but at least frameDraw() is implemented by an application.
virtual EQ_API bool	configInit (const uint128_t &initID)
	Initialize this channel. More...
virtual EQ_API bool	configExit ()
	Exit this channel. More...
virtual EQ_API void	frameStart (const uint128_t &frameID, const uint32_t frameNumber)
	Start rendering a frame. More...
virtual EQ_API void	frameFinish (const uint128_t &frameID, const uint32_t frameNumber)
	Finish rendering a frame. More...
virtual EQ_API void	frameDrawFinish (const uint128_t &frameID, const uint32_t frameNumber)
	Finish drawing. More...
virtual EQ_API void	frameClear (const uint128_t &frameID)
	Clear the frame buffer. More...
virtual EQ_API void	frameDraw (const uint128_t &frameID)
	Draw the scene. More...
virtual EQ_API void	frameAssemble (const uint128_t &frameID, const Frames &frames)
	Assemble all input frames. More...
virtual EQ_API void	frameReadback (const uint128_t &frameID, const Frames &frames)
	Read back the rendered frame buffer into the output frames. More...
virtual EQ_API void	frameViewStart (const uint128_t &frameID)
	Start updating a destination channel. More...
virtual EQ_API void	frameViewFinish (const uint128_t &frameID)
	Finish updating a destination channel. More...
Protected Member Functions inherited from eq::fabric::Channel< Window, Channel >
EQFABRIC_INL	Channel (Window *parent)
	Construct a new channel.
	Channel (const Channel &from)
	Construct a copy of a channel (view/segment dest).
virtual EQFABRIC_INL void	serialize (co::DataOStream &os, const uint64_t dirtyBits)
virtual EQFABRIC_INL void	deserialize (co::DataIStream &is, const uint64_t dirtyBits)
virtual EQFABRIC_INL void	setDirty (const uint64_t bits)
void	setIAttribute (const IAttribute attr, const int32_t value)
void	setSAttribute (const SAttribute attr, const std::string &value)
virtual ChangeType	getChangeType () const
virtual uint64_t	getRedistributableBits () const
virtual void	updateCapabilities ()
void	overrideContext (RenderContext &context)
void	resetContext ()
const RenderContext &	getContext () const
const RenderContext &	getNativeContext () const
Protected Member Functions inherited from eq::fabric::Object
EQFABRIC_API	Object ()
	Construct a new Object. More...
EQFABRIC_API	Object (const Object &)
	Construct an unmapped, unregistered copy of an object. More...
virtual EQFABRIC_API	~Object ()
	Destruct the object. More...
EQFABRIC_API Object &	operator= (const Object &from)
	NOP assignment operator. More...
virtual bool	hasMasterUserData ()
virtual uint32_t	getUserDataLatency () const
EQFABRIC_API void	setTasks (const uint32_t tasks)
virtual EQFABRIC_API void	notifyDetach ()
EQFABRIC_API void	postRemove (Object *child)
virtual void	removeChild (const uint128_t &)
template<class C , class S >
void	commitChild (C *child, S *sender, uint32_t cmd, const uint32_t incarnation)
template<class C >
void	commitChild (C *child, const uint32_t incarnation)
template<class C , class S >
void	commitChildren (const std::vector< C * > &children, S *sender, uint32_t cmd, const uint32_t incarnation)
template<class C >
void	commitChildren (const std::vector< C * > &children, uint32_t cmd, const uint32_t incarnation)
template<class C >
void	commitChildren (const std::vector< C * > &children, const uint32_t incarnation)
template<class C >
void	syncChildren (const std::vector< C * > &children)
template<class P , class C >
void	releaseChildren (const std::vector< C * > &children)
EQFABRIC_API bool	_cmdSync (co::ICommand &command)

Friends
class	fabric::Window< Pipe, Window, Channel, WindowSettings >

Additional Inherited Members
Public Types inherited from eq::fabric::Channel< Window, Channel >
typedef LeafVisitor< Channel >	Visitor
	The channel visitor type.
typedef Window	Parent
	The parent window type.
enum	IAttribute
	Integer attributes for a channel. More...
enum	SAttribute
	String attributes. More...
Public Types inherited from eq::fabric::Object
enum	DirtyBits {   DIRTY_NAME = Serializable::DIRTY_CUSTOM << 0, DIRTY_USERDATA = Serializable::DIRTY_CUSTOM << 1, DIRTY_TASKS = Serializable::DIRTY_CUSTOM << 2, DIRTY_REMOVED = Serializable::DIRTY_CUSTOM << 3,   DIRTY_SERIAL = Serializable::DIRTY_CUSTOM << 4, DIRTY_CUSTOM = Serializable::DIRTY_CUSTOM << 6, DIRTY_OBJECT_BITS = DIRTY_NAME | DIRTY_USERDATA }
	The changed parts of the object since the last pack(). More...
Static Public Member Functions inherited from eq::fabric::Channel< Window, Channel >
static EQFABRIC_INL const std::string &	getIAttributeString (const IAttribute attr)
static EQFABRIC_INL const std::string &	getSAttributeString (const SAttribute attr)
Protected Types inherited from eq::fabric::Channel< Window, Channel >
enum	DirtyBits

Detailed Description

A channel represents a two-dimensional viewport within a Window.

The channel is the basic rendering entity. It represents a 2D rendering area within a Window. It executes all rendering-relevant tasks, such as clear, draw, assemble and readback. Each rendering task is using its own RenderContext, which is computed by the server based on the rendering description of the current configuration.

See Also

fabric::Channel

Definition at line 43 of file channel.h.

Constructor & Destructor Documentation

EQ_API eq::Channel::Channel ( Window *  parent )

explicit

Construct a new channel.

Version

1.0

virtual EQ_API eq::Channel::~Channel ( )

virtual

Destruct the channel.

Version

1.0

Reimplemented from eq::fabric::Channel< Window, Channel >.

Member Function Documentation

EQ_API void eq::Channel::addResultImageListener

(

ResultImageListener *

listener

)

Add a listener that gets notified everytime a new frame was rendered for a destination channel.

The channel does not take ownership of the listener. The notification always happens in the render thread.

Parameters

listener

the new listener to add

Version

1.9

virtual EQ_API void eq::Channel::applyBuffer ( )

virtual

Apply the current rendering buffer, including the color mask.

See Also

getReadBuffer() , getDrawBuffer(), getDrawBufferMask()

Version

1.0

virtual EQ_API void eq::Channel::applyColorMask ( ) const

virtual

Apply the current color mask.

See Also

applyBuffer(), getDrawBufferMask()

Version

1.0

virtual EQ_API void eq::Channel::applyFrustum ( ) const

virtual

Apply the frustum matrix for the current rendering task.

If a sub-pixel decomposition is defined, the frustum is jittered by the amount given by getJitter() to implement software anti-aliasing. Applications which want to implement a different multi-sampling algorithm, e.g., depth-of-field, have to re-implement getJitter() or applyFrustum() accordingly.

See Also

useOrtho(), getJitter(), getSubPixel()

Version

1.0

virtual EQ_API void eq::Channel::applyHeadTransform ( ) const

virtual

Apply the transformation to position the view frustum.

Version

1.0

See Also

useOrtho()

virtual EQ_API void eq::Channel::applyOrtho ( ) const

virtual

Apply the orthographic frustum matrix for the current rendering task.

Version

1.0

virtual EQ_API void eq::Channel::applyOrthoTransform ( ) const

virtual

Apply the transformation to position the orthographic view frustum.

Version

1.0

virtual EQ_API void eq::Channel::applyPerspective ( ) const

virtual

Apply the perspective frustum matrix for the current rendering task.

Version

1.0

virtual EQ_API void eq::Channel::applyPerspectiveTransform ( ) const

virtual

Apply the transformation to position the perspective view frustum.

Version

1.0

EQ_API void eq::Channel::applyScreenFrustum

(

)

const

Apply an orthographic frustum for pixel-based 2D operations.

One unit of the frustum covers one pixel on screen. The frustum is positioned relative to the view.

Version

1.0

virtual EQ_API void eq::Channel::applyViewport ( ) const

virtual

Apply the OpenGL viewport for the current rendering task.

See Also

getViewport()

Version

1.0

EQ_API void eq::Channel::bindDrawFrameBuffer

(

)

Rebind the window draw buffer.

Version

1.9

EQ_API void eq::Channel::bindFrameBuffer

(

)

Rebind the window frame buffer.

Version

1.0

virtual EQ_API bool eq::Channel::configExit ( )

protectedvirtual

Exit this channel.

Version

1.0

virtual EQ_API bool eq::Channel::configInit ( const uint128_t &  initID )

protectedvirtual

Initialize this channel.

Parameters

initID

the init identifier.

Version

1.0

virtual EQ_API void eq::Channel::declareRegion ( const eq::PixelViewport &  region )

virtual

Declare a region covered by the current draw or assemble operation.

The region is relative to the current pixel viewport. It is clipped against the current pixel viewport of the channel. Called with the full pixel viewport after frameDraw if no region has been declared.

Declaring a single, empty region causes this channel to not read back any pixel data, i.e., if it did not draw anything.

The implementation might merge or split the declared regions.

Version

1.3

EQ_API void eq::Channel::declareRegion

(

const eq::Viewport &

vp

)

Convenience method to declare a region in relative coordinates.

The given viewport is relative to the current pixel viewport.

Version

1.3

virtual EQ_API void eq::Channel::drawStatistics ( )

virtual

Draw a statistics overlay.

Version

1.0

virtual EQ_API void eq::Channel::frameAssemble ( const uint128_t &  frameID, const Frames &  frames  )

protectedvirtual

Assemble all input frames.

Called 0 to n times during one frame.

Parameters

frameID	the per-frame identifier.
frames	the input frames.

Version

1.7.3

virtual EQ_API void eq::Channel::frameClear ( const uint128_t &  frameID )

protectedvirtual

Clear the frame buffer.

Called 0 to n times during one frame.

Parameters

frameID

the per-frame identifier.

Version

1.0

virtual EQ_API void eq::Channel::frameDraw ( const uint128_t &  frameID )

protectedvirtual

Draw the scene.

Called 0 to n times during one frame.

Parameters

frameID

the per-frame identifier.

Version

1.0

virtual EQ_API void eq::Channel::frameDrawFinish ( const uint128_t &  frameID, const uint32_t  frameNumber  )

protectedvirtual

Finish drawing.

Called once per frame after the last draw operation. Typically releases the local node thread synchronization for this frame.

Parameters

frameID	the per-frame identifier.
frameNumber	the frame to finished with draw.

Version

1.0

virtual EQ_API void eq::Channel::frameFinish ( const uint128_t &  frameID, const uint32_t  frameNumber  )

protectedvirtual

Finish rendering a frame.

Called once at the end of each frame, to do per-frame updates of channel-specific data. This method has to call releaseFrame().

Parameters

frameID	the per-frame identifier.
frameNumber	the frame to finish.

Version

1.0

virtual EQ_API void eq::Channel::frameReadback ( const uint128_t &  frameID, const Frames &  frames  )

protectedvirtual

Read back the rendered frame buffer into the output frames.

Called 0 to n times during one frame.

Parameters

frameID	the per-frame identifier.
frames	the output frames.

Version

1.7.3

1.0

virtual EQ_API void eq::Channel::frameStart ( const uint128_t &  frameID, const uint32_t  frameNumber  )

protectedvirtual

Start rendering a frame.

Called once at the beginning of each frame, to do per-frame updates of channel-specific data. This method has to call startFrame().

Parameters

frameID	the per-frame identifier.
frameNumber	the frame to start.

See Also

Config::startFrame()

Version

1.0

virtual void eq::Channel::frameTilesFinish ( const uint128_t &  )

inlineprotectedvirtual

Finish a batch of tile rendering operations.

Version

1.1.6

Definition at line 576 of file channel.h.

virtual void eq::Channel::frameTilesStart ( const uint128_t &  )

inlineprotectedvirtual

Start a batch of tile rendering operations.

Version

1.1.6

Definition at line 573 of file channel.h.

virtual EQ_API void eq::Channel::frameViewFinish ( const uint128_t &  frameID )

protectedvirtual

Finish updating a destination channel.

Called once for each destination channel's eye pass, before frameFinish() to update a part of a display. Destination channels are the final display channels, e.g., channels which are defined by a view/segment intersection.

This is typically used to do operations on the output channel after it has been fully updated, e.g., to draw a 2D overlay or to perform post-processing on the rendered image.

Parameters

frameID

the per-frame identifier.

Version

1.0

virtual EQ_API void eq::Channel::frameViewStart ( const uint128_t &  frameID )

protectedvirtual

Start updating a destination channel.

Called once for each destination channel's eye pass, after frameStart() to update a part of a display. Destination channels are the final display channels, e.g., channels which are defined by a view/segment intersection.

Parameters

frameID

the per-frame identifier.

Version

1.0

EQ_API Config* eq::Channel::getConfig

(

)

Returns

the parent config.

Version

1.0

EQ_API const Config* eq::Channel::getConfig

(

)

const

Returns

the parent config.

Version

1.0

EQ_API const DrawableConfig& eq::Channel::getDrawableConfig

(

)

const

Returns

the channel's drawable config.

Version

1.0

virtual EQ_API std::string eq::Channel::getDumpImageFileName ( ) const

virtual

Returns

filename for image if SATTR_DUMP_IMAGE, default "getCurrentFrame().rgb"

Version

1.9

virtual EQ_API Vector2f eq::Channel::getJitter ( ) const

virtual

Returns

the jitter vector for the current subpixel decomposition.

Version

1.0

EQ_API View* eq::Channel::getNativeView

(

)

Get the channel's native view.

This function always returns the channel's native view, no matter in which context it is called. Only destination channels have a native view.

Returns

the channel's native view, or 0 if it does not have one.

See Also

getView()

Version

1.0

EQ_API const View* eq::Channel::getNativeView

(

)

const

const-version of getNativeView()

Version

1.0

EQ_API Node* eq::Channel::getNode

(

)

Returns

the parent node.

Version

1.0

EQ_API const Node* eq::Channel::getNode

(

)

const

Returns

the parent node.

Version

1.0

EQ_API util::ObjectManager& eq::Channel::getObjectManager

(

)

Returns

the window's object manager instance.

Version

1.0

EQ_API Pipe* eq::Channel::getPipe

(

)

Returns

the parent pipe.

Version

1.0

EQ_API const Pipe* eq::Channel::getPipe

(

)

const

Returns

the parent pipe.

Version

1.0

EQ_API PixelViewport eq::Channel::getRegion

(

)

const

Returns

a region covering all declared regions.

Version

1.3

EQ_API const PixelViewports& eq::Channel::getRegions

(

)

const

Get the current regions of interest.

The returned regions are guaranteed not to overlap with each other. Therefore they may differ in number and size from the declared regions. The actual algorithm to create the non-overlapping regions is unspecified and may change in the future.

Returns

current regions of interest.

Version

1.3

EQ_API Frustumf eq::Channel::getScreenFrustum

(

)

const

Returns an orthographic frustum for 2D operations on the view.

One unit of the frustum covers one pixel on screen. The frustum is positioned relative to the view.

Returns

the 2D orthographic frustum.

Version

1.0

EQ_API ServerPtr eq::Channel::getServer

(

)

Returns

the parent server.

Version

1.0

EQ_API const Vector3ub& eq::Channel::getUniqueColor

(

)

const

Returns

a fixed unique color for this channel.

Version

1.0

EQ_API View* eq::Channel::getView

(

)

Get the channel's current View.

During a frame task method, i.e., in one of the frameFoo functions, the view is set to the view of the destination channel, that is, the channel for which this channel is executing the rendering task. Outside of a frame task method the native view of the channel, or 0, is returned.

Returns

the channel's view, or 0 if it does not have a view.

See Also

getNativeView()

Version

1.0

EQ_API const View* eq::Channel::getView

(

)

const

Const version of getView().

Version

1.0

EQ_API const GLEWContext* eq::Channel::glewGetContext

(

)

const

Get the GLEW context for this channel.

The GLEW context is initialized during window initialization, and provides access to OpenGL extensions. This function does not follow the Equalizer naming conventions, since GLEW uses a function of this name to automatically resolve OpenGL function entry points. Therefore, any supported GL function can be called directly from an initialized Channel.

Returns

the extended OpenGL function table for the channel's OpenGL context.

Version

1.0

EQ_API bool eq::Channel::isStopped

(

)

const

Returns

true if this channel is stopped, false otherwise.

Version

1.0

virtual EQ_API void eq::Channel::notifyStopFrame ( const uint32_t  lastFrameNumber )

protectedvirtual

Notify interruption of the rendering.

This method is called from the Client command thread, as opposed to the rendering thread. Its purpose is to cause the rendering thread to stop its operations as soon as possible. Normal rendering shall recommence after the given frame.

Parameters

lastFrameNumber

stop rendering until this frame has been processed.

Version

1.0

virtual EQ_API void eq::Channel::notifyViewportChanged ( )

protectedvirtual

Notification that parameters influencing the vp/pvp have changed.

Reimplemented from eq::fabric::Channel< Window, Channel >.

virtual EQ_API void eq::Channel::outlineViewport ( )

virtual

Outline the current pixel viewport.

Version

1.0

virtual EQ_API bool eq::Channel::processEvent ( const Event &  event )

virtual

Process a received event.

The task of this method is to update the channel as necessary, and transform the event into a config event to be send to the application using Config::sendEvent().

Parameters

event

the received event.

Returns

true when the event was handled, false if not.

Version

1.0

EQ_API void eq::Channel::releaseFrame ( const uint32_t  frameNumber )

protected

Signal the completion of a frame to the parent.

Parameters

frameNumber

the frame to end.

Version

1.0

EQ_API void eq::Channel::releaseFrameLocal ( const uint32_t  frameNumber )

protected

Release the local synchronization of the parent for a frame.

Parameters

frameNumber

the frame to release.

Version

1.0

EQ_API void eq::Channel::removeResultImageListener

(

ResultImageListener *

listener

)

Remove a result image listener to stop receival of notifications on new images.

Parameters

listener

the new listener to remove

Version

1.9

virtual EQ_API void eq::Channel::resetAssemblyState ( )

protectedvirtual

Reset the OpenGL state after an assembly operation.

Version

1.0

virtual EQ_API void eq::Channel::resetRegions ( )

virtual

Reset the declared regions of interest.

Called from frameStart and frameClear to reset the area to be used to optimize compositing and load balancing for each frame.

Version

1.3

EQ_API EventOCommand eq::Channel::sendError

(

const uint32_t

error

)

Send a channel error event to the application node.

Parameters

error

the error code.

Version

1.7.1

virtual EQ_API void eq::Channel::setupAssemblyState ( )

protectedvirtual

Setup the OpenGL state for a readback or assemble operation.

The default implementation is very conservative and saves any state which is potentially changed by the assembly routines. Applications may overwrite this and resetAssemblyState() to optimize performance in accordance with their rendering code.

Version

1.0

EQ_API void eq::Channel::startFrame ( const uint32_t  frameNumber )

protected

Start a frame by unlocking all child resources.

Parameters

frameNumber

the frame to start.

Version

1.0

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

• channel.h