SoGLCallback Class Reference

Provides custom OpenGL behavior during rendering actions. More...

#include <Inventor/nodes/SoGLCallback.h>

Inheritance diagram for SoGLCallback:

Public Member Functions
virtual SoType	getTypeId () const
	Returns the type identifier for this specific instance.
	SoGLCallback ()
	Constructor.
Public Member Functions inherited from SoCallback
	SoCallback ()
	Creates a callback node with default settings.
void	setCallback (SoCallbackCB *func, void *localUserData=NULL)
	Sets pointer to callback function and user data.
Public Member Functions inherited from SoNode
virtual void	setOverride (const SbBool state)
	Turns the override flag on or off.
virtual SbBool	isOverride () const
	Returns the state of the override flag.
virtual SoNode *	copy (SbBool copyConnections=FALSE) const
	Creates and returns an exact copy of the node.
virtual SbBool	affectsState () const
	Returns TRUE if a node has an effect on the state during traversal.
virtual void	touch ()
	Marks an instance as modified, simulating a change to it.
Public Member Functions inherited from SoFieldContainer
void	setToDefaults ()
	Sets all fields in this object to their default values.
SbBool	hasDefaultValues () const
	Returns TRUE if all of the object's fields have their default values.
SbBool	fieldsAreEqual (const SoFieldContainer *fc) const
	Returns TRUE if this object's fields are exactly equal to fc's fields.
void	copyFieldValues (const SoFieldContainer *fc, SbBool copyConnections=FALSE)
	Copies the contents of fc's fields into this object's fields.
SoNONUNICODE SbBool	set (const char *fieldDataString)
	Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.
SbBool	set (const SbString &fieldDataString)
	Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.
void	get (SbString &fieldDataString)
	Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.
virtual int	getFields (SoFieldList &list) const
	Appends references to all of this object's fields to resultList, and returns the number of fields appended.
virtual int	getAllFields (SoFieldList &list) const
	Returns a list of fields, including the eventIn's and eventOut's.
virtual SoField *	getField (const SbName &fieldName) const
	Returns a the field of this object whose name is fieldName.
virtual SoField *	getEventIn (const SbName &fieldName) const
	Returns a the eventIn with the given name.
virtual SoField *	getEventOut (const SbName &fieldName) const
	Returns the eventOut with the given name.
SbBool	getFieldName (const SoField *field, SbName &fieldName) const
	Returns the name of the given field in the fieldName argument.
SbBool	enableNotify (SbBool flag)
	Notification at this Field Container is enabled (if flag == TRUE) or disabled (if flag == FALSE).
SbBool	isNotifyEnabled () const
	Notification is the process of telling interested objects that this object has changed.
virtual void	setUserData (void *data)
	Sets application data.
void *	getUserData (void) const
	Gets user application data.
Public Member Functions inherited from SoBase
virtual SbName	getName () const
	Returns the name of an instance.
virtual void	setName (const SbName &name)
	Sets the name of an instance.
void	setSynchronizable (const bool b)
	Sets this to be a ScaleViz synchronizable object.
bool	isSynchronizable () const
	Gets the ScaleViz synchronizable state of this object.
Public Member Functions inherited from SoRefCounter
void	ref () const
	Adds a reference to an instance.
void	unref () const
	Removes a reference from an instance.
void	unrefNoDelete () const
	unrefNoDelete() should be called when it is desired to decrement the reference count, but not delete the instance if this brings the reference count to zero.
int	getRefCount () const
	Returns current reference count.
void	lock () const
	lock this instance.
void	unlock () const
	unlock this instance.
Public Member Functions inherited from SoTypedObject
SbBool	isOfType (const SoType &type) const
	Returns TRUE if this object is of the type specified in type or is derived from that type.
template<typename TypedObjectClass >
SbBool	isOfType () const
	Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.

Static Public Member Functions
static SoType	getClassTypeId ()
	Returns the type identifier for this class.
Static Public Member Functions inherited from SoCallback
static SoType	getClassTypeId ()
	Returns the type identifier for this class.
Static Public Member Functions inherited from SoNode
static SoType	getClassTypeId ()
	Returns the type identifier for this class.
static SoNode *	getByName (const SbName &name)
	A node's name can be set using SoBase::setName().
static int	getByName (const SbName &name, SoNodeList &list)
	A node's name can be set using SoBase::setName().
Static Public Member Functions inherited from SoFieldContainer
static SoType	getClassTypeId ()
	Returns the type of this class.
Static Public Member Functions inherited from SoBase
static SoType	getClassTypeId ()
	Returns type identifier for this class.
Static Public Member Functions inherited from SoTypedObject
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Detailed Description

Provides custom OpenGL behavior during rendering actions.

This node behaves exactly like an SoCallback except... the SoGLCallback node allows the application to make OpenGL calls during a render traversal. It is normally used to make OpenGL rendering calls (and any state setting calls needed for rendering).

SoGLCallback automatically calls glPushAttrib() to save the OpenGL state before executing the callback and then calls glPopAttrib() (restore) after executing the callback, ensuring that OpenGL state cannot leak outside the node.

Please note that this means an SoGLCallback node cannot modify the OpenGL state used for Open Inventor rendering. (This is a change since Open Inventor 10.0) You must use standard Open Inventor nodes to modify state for Open Inventor rendering. For example, use an SoViewport node to change the OpenGL viewport, use the SoDepthBuffer node to change the OpenGL depth buffer test and so on.

You can use this node to get values from the Open Inventor traversal state list using the SoElement classes. For example, SoLineWidthElement contains the current line width set by an SoDrawStyle node.

This node should not be used to do Open Inventor rendering. Open Inventor rendering calls should only be done using an SoCallBack node.

There is some "overhead" for rendering using SoGLCallback instead of Open Inventor nodes. Normal Open Inventor rendering is optimized in various ways to maximize GPU performance and to keep the GPU "busy". When an SoGLCallback node is traversed, Open Inventor must finish all current rendering, execute the application's OpenGL calls, then resume normal rendering.

Create the node:

SoGLCallback* glCallbackNode = new SoGLCallback();
glCallbackNode->setCallback( myGLCallback );
root->addChild( glCallbackNode );

Create the Callback:

The callback function registered with the node will only be executed during SoGLRenderAction traversal, as calling OpenGL functions requires a current OpenGL context.

void myCallback( void* data, SoAction* action )
{
  // Safe to call OpenGL functions
}

FILE FORMAT/DEFAULT

GLCallback { }

ACTION BEHAVIOR

SoGLRenderAction, SoGetBoundingBoxAction, SoPickAction
Calls the specified callback for all actions.

SEE ALSO

SoAction, SoCallback, SoCallbackAction, SoEventCallback

NOTE: node available since Open Inventor 10.0

Definition at line 155 of file SoGLCallback.h.

Constructor & Destructor Documentation

SoGLCallback()

SoGLCallback::SoGLCallback

(

)

Constructor.

Member Function Documentation

getClassTypeId()

static SoType SoGLCallback::getClassTypeId ( )

static

Returns the type identifier for this class.

getTypeId()

virtual SoType SoGLCallback::getTypeId ( ) const

virtual

Returns the type identifier for this specific instance.

Reimplemented from SoCallback.

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

• Inventor/nodes/SoGLCallback.h