SoElement Class Reference

SoElement is the abstract base class for all elements. More...

#include <Inventor/elements/SoElement.h>

Inheritance diagram for SoElement:

Public Member Functions
const SoType	getTypeId (void) const
int	getStackIndex (void) const
virtual void	init (SoState *state)
virtual void	push (SoState *state)
virtual void	pop (SoState *state, const SoElement *prevTopElement)
virtual SbBool	matches (const SoElement *element) const =0
virtual SoElement *	copyMatchInfo (void) const =0
void	setDepth (const int depth)
int	getDepth (void) const
virtual void	print (FILE *file=stdout) const
virtual	~SoElement ()

Static Public Member Functions
static void	initClass (void)
static SoType	getClassTypeId (void)
static int	getClassStackIndex (void)
static void	initElements (void)
static int	getNumStackIndices (void)
static SoType	getIdFromStackIndex (const int stackIndex)

Protected Member Functions
	SoElement (void)
void	capture (SoState *const state) const
virtual void	captureThis (SoState *state) const
void	setTypeId (const SoType typeId)
void	setStackIndex (const int index)
SoElement *	getNextInStack (void) const
SoElement *	getNextFree (void) const

Static Protected Member Functions
static SoElement *	getElement (SoState *const state, const int stackIndex)
static const SoElement *	getConstElement (SoState *const state, const int stackIndex)
static int	createStackIndex (const SoType id)

Protected Attributes
SoType	typeId
int	stackIndex
int	depth

Static Protected Attributes
static int	classStackIndex
static SoTypeList *	stackToType

Detailed Description

SoElement is the abstract base class for all elements.

This is the base class for all the element classes in Coin.

Constructor & Destructor Documentation

~SoElement()

SoElement::~SoElement ( )

virtual

The destructor.

SoElement()

SoElement::SoElement ( void  )

protected

The constructor. To create element instances, use SoType::createInstance() for the elements type identifier.

Member Function Documentation

initClass()

void SoElement::initClass ( void  )

static

Initialize relevant common data for all instances, like the type system.

getClassTypeId()

SoType SoElement::getClassTypeId ( void  )

static

This static method returns the SoType object associated with objects of this class.

getClassStackIndex()

int SoElement::getClassStackIndex ( void  )

static

This static method returns the state stack index for the class.

getTypeId()

const SoType SoElement::getTypeId

(

void

)

const

Returns the type identification of an object derived from a class inheriting SoElement. This is used for runtime type checking and "downward" casting.

For a more thorough explanation of the runtime type identification functionality, see the documentation of SoBase::getTypeId().

getStackIndex()

int SoElement::getStackIndex

(

void

)

const

Returns the stack index for an element instance.

init()

void SoElement::init ( SoState *  state )

virtual

This function initializes the element type in the given SoState. It is called for the first element of each enabled element type in SoState objects.

Reimplemented in SoLazyElement, SoOverrideElement, SoTextureCombineElement, SoMultiTextureImageElement, SoDepthBufferElement, SoShapeStyleElement, SoUnitsElement, SoMultiTextureCoordinateElement, SoShapeHintsElement, SoGLVBOElement, SoMaterialBindingElement, SoNormalBindingElement, SoMultiTextureEnabledElement, SoGLCacheContextElement, SoEnvironmentElement, SoPickStyleElement, SoProfileElement, SoTextureOverrideElement, SoVertexAttributeBindingElement, SoDrawStyleElement, SoProfileCoordinateElement, SoShadowStyleElement, SoComplexityTypeElement, SoGLShadowCullingElement, SoCacheHintElement, SoGLLazyElement, SoPolygonOffsetElement, SoTextureCoordinateBindingElement, SoWindowElement, SoCullElement, SoGLMultiTextureImageElement, SoLightElement, SoLightModelElement, SoLinePatternElement, SoAccumulatedElement, SoAnnoText3FontSizeHintElement, SoAnnoText3RenderPrintElement, SoBumpMapElement, SoGeoElement, SoDiffuseColorElement, SoGLMultiTextureCoordinateElement, SoMultiTextureMatrixElement, SoTextureUnitElement, SoVertexAttributeElement, SoResetMatrixElement, SoAmbientColorElement, SoBBoxModelMatrixElement, SoCacheElement, SoClipPlaneElement, SoCoordinateElement, SoDecimationTypeElement, SoEmissiveColorElement, SoGLColorIndexElement, SoGLMultiTextureEnabledElement, SoGLMultiTextureMatrixElement, SoGLPointSizeElement, SoGLUpdateAreaElement, SoModelMatrixElement, SoNormalElement, SoSpecularColorElement, SoBumpMapCoordinateElement, SoBumpMapMatrixElement, SoFontNameElement, SoInt32Element, SoLightAttenuationElement, SoListenerDopplerElement, SoListenerOrientationElement, SoListenerPositionElement, SoPickRayElement, SoProjectionMatrixElement, SoReplacedElement, SoTransparencyElement, SoViewVolumeElement, SoViewingMatrixElement, SoViewportRegionElement, SoAnnoText3CharOrientElement, SoComplexityElement, SoCreaseAngleElement, SoDecimationPercentageElement, SoFloatElement, SoFocalDistanceElement, SoFontSizeElement, SoGLClipPlaneElement, SoGLDrawStyleElement, SoGLEnvironmentElement, SoGLLightIdElement, SoGLLinePatternElement, SoGLLineWidthElement, SoGLModelMatrixElement, SoGLNormalElement, SoGLPolygonOffsetElement, SoGLRenderPassElement, SoGLShaderProgramElement, SoGLShapeHintsElement, SoGLVertexAttributeElement, SoGLViewingMatrixElement, SoGLViewportRegionElement, SoLineWidthElement, SoListenerGainElement, SoLocalBBoxMatrixElement, SoPointSizeElement, SoShininessElement, SoSoundElement, SoSwitchElement, SoTextOutlineEnabledElement, SoTextureQualityElement, and SoGLDepthBufferElement.

push()

void SoElement::push ( SoState *  state )

virtual

This method is called every time a new element is required in one of the stacks. This happens when a writable element is requested, using SoState::getElement() or indirectly SoElement::getElement(), and the depth of the current element is less than the state depth.

Override this method if your element needs to copy data from the previous top of stack. The push() method is called on the new element, and the previous element can be found using SoElement::getNextInStack().

Reimplemented in SoMultiTextureImageElement, SoMultiTextureCoordinateElement, SoLazyElement, SoTextureCombineElement, SoOverrideElement, SoShapeStyleElement, SoDepthBufferElement, SoMultiTextureEnabledElement, SoShapeHintsElement, SoSoundElement, SoGLVBOElement, SoGLShadowCullingElement, SoProfileElement, SoTextureOverrideElement, SoWindowElement, SoCacheHintElement, SoGLLazyElement, SoGLShaderProgramElement, SoCullElement, SoGLMultiTextureImageElement, SoLightElement, SoAccumulatedElement, SoVertexAttributeElement, SoBBoxModelMatrixElement, SoCacheElement, SoGLMultiTextureCoordinateElement, SoGLMultiTextureEnabledElement, SoGLPointSizeElement, SoMultiTextureMatrixElement, SoClipPlaneElement, SoGLMultiTextureMatrixElement, SoGLUpdateAreaElement, SoModelMatrixElement, SoBumpMapMatrixElement, SoGLDrawStyleElement, SoGLLightIdElement, SoGLLinePatternElement, SoGLLineWidthElement, SoGLModelMatrixElement, SoGLShapeHintsElement, SoGLViewingMatrixElement, SoLocalBBoxMatrixElement, SoTextOutlineEnabledElement, SoGLPolygonOffsetElement, SoGLViewportRegionElement, and SoGLDepthBufferElement.

pop()

void SoElement::pop ( SoState *  state, const SoElement *  prevTopElement  )

virtual

This method is called when the state is popped, and the depth of the element is bigger than the current state depth. pop() is called on the new top of stack, and a pointer to the previous top of stack is passed in prevTopElement.

Override this method if you need to copy some state information from the previous top of stack.

Reimplemented in SoShapeStyleElement, SoDepthBufferElement, SoShapeHintsElement, SoSoundElement, SoGLVBOElement, SoGLShadowCullingElement, SoWindowElement, SoCacheHintElement, SoGLLazyElement, SoGLShaderProgramElement, SoGLMultiTextureImageElement, SoCacheElement, SoGLMultiTextureCoordinateElement, SoGLMultiTextureEnabledElement, SoGLPointSizeElement, SoGLMultiTextureMatrixElement, SoGLUpdateAreaElement, SoGLDrawStyleElement, SoGLLightIdElement, SoGLLinePatternElement, SoGLLineWidthElement, SoGLModelMatrixElement, SoGLShapeHintsElement, SoGLViewingMatrixElement, SoTextOutlineEnabledElement, SoGLPolygonOffsetElement, SoGLViewportRegionElement, SoGLClipPlaneElement, SoGLEnvironmentElement, SoGLProjectionMatrixElement, and SoGLDepthBufferElement.

matches()

SbBool SoElement::matches ( const SoElement *  element ) const

pure virtual

This function returns TRUE is the element matches another element (of the same class), with respect to cache validity.

If the application programmer's extension element has a matches() function, it should also have a copyMatchInfo() function.

Implemented in SoMultiTextureImageElement, SoMultiTextureCoordinateElement, SoLazyElement, SoTextureCombineElement, SoOverrideElement, SoDepthBufferElement, SoShapeStyleElement, SoShapeHintsElement, SoLocalBBoxMatrixElement, SoMultiTextureEnabledElement, SoGLVBOElement, SoCullElement, SoGLCacheContextElement, SoCacheElement, SoWindowElement, SoCacheHintElement, SoGLShaderProgramElement, SoResetMatrixElement, SoFontNameElement, SoLightAttenuationElement, SoGLUpdateAreaElement, SoTextureOverrideElement, SoProfilerElement, SoModelMatrixElement, SoInt32Element, SoPickRayElement, SoFloatElement, SoReplacedElement, SoViewportRegionElement, SoAccumulatedElement, and SoGLRenderPassElement.

copyMatchInfo()

SoElement * SoElement::copyMatchInfo ( void  ) const

pure virtual

This function creates a copy of the element that contains enough information to enable the matches() function to work.

Used to help with scene graph traversal caching operations.

Implemented in SoMultiTextureImageElement, SoMultiTextureCoordinateElement, SoLazyElement, SoTextureCombineElement, SoOverrideElement, SoDepthBufferElement, SoShapeStyleElement, SoShapeHintsElement, SoLocalBBoxMatrixElement, SoMultiTextureEnabledElement, SoGLVBOElement, SoCullElement, SoGLCacheContextElement, SoCacheElement, SoWindowElement, SoAccumulatedElement, SoCacheHintElement, SoGLShaderProgramElement, SoResetMatrixElement, SoFontNameElement, SoLightAttenuationElement, SoGLUpdateAreaElement, SoTextureOverrideElement, SoProfilerElement, SoInt32Element, SoPickRayElement, SoReplacedElement, SoFloatElement, SoViewportRegionElement, and SoGLRenderPassElement.

initElements()

void SoElement::initElements ( void  )

static

This function initializes all the built-in Coin element classes.

getNumStackIndices()

int SoElement::getNumStackIndices ( void  )

static

Returns the number of allocated element stack index slots.

getIdFromStackIndex()

SoType SoElement::getIdFromStackIndex ( const int  stackIndex )

static

Returns the SoType identifier for the element class with element state stack index stackIndex.

setDepth()

void SoElement::setDepth

(

const int

depth

)

Sets the depth value of the element instance in the state stack.

getDepth()

int SoElement::getDepth

(

void

)

const

Returns the state stack depth value of the element instance.

print()

void SoElement::print ( FILE *  file = stdout ) const

virtual

This function is for printing element information, and is used mostly for debugging purposes.

Reimplemented in SoOverrideElement, SoShapeHintsElement, SoEnvironmentElement, SoSoundElement, SoCoordinateElement, SoTextureOverrideElement, SoFontNameElement, SoLightAttenuationElement, SoListenerDopplerElement, SoViewportRegionElement, SoListenerOrientationElement, SoListenerPositionElement, SoReplacedElement, SoInt32Element, and SoFloatElement.

getElement()

SoElement * SoElement::getElement ( SoState *const  state, const int  stackIndex  )

inlinestaticprotected

This method returns the top instance (in the state stack) of the element class with stack index stackIndex.

The returned instance is writable. To make this instance, some lazy evaluation may have to be performed, so use getConstElement() instead if the instance shouldn't be modified.

If no instance is available and cannot be made, NULL is returned.

See also

const SoElement * SoElement::getConstElement(SoState * const state, const int stackIndex)

getConstElement()

void const SoElement * SoElement::getConstElement ( SoState *const  state, const int  stackIndex  )

inlinestaticprotected

This method returns a reference to the top element of the class with stack index stackIndex. The returned element is non-mutable.

(Don't try to be clever and cast away the constness – if the returned instance is modified, strange, hard to find and generally wonderful bugs will most likely start to happen.)

If no instance can be returned, NULL is returned.

See also

SoElement * SoElement::getElement(SoState * const state, const int stackIndex)

capture()

void SoElement::capture ( SoState *const  state ) const

inlineprotected

This function does whatever is necessary in the state for caching purposes. If should be called by subclasses of SoElement whenever any value in the element is accessed.

captureThis()

void SoElement::captureThis ( SoState *  state ) const

protectedvirtual

Adds the element to the cache.

Reimplemented in SoAccumulatedElement.

setTypeId()

void SoElement::setTypeId ( const SoType  typeId )

protected

Sets the type identifier of an instance.

Note that this is fundamentally different from the SoNode runtime type system.

setStackIndex()

void SoElement::setStackIndex ( const int  stackIndex )

protected

Sets the stack index in an instance. Used in constructors of derived elements.

createStackIndex()

int SoElement::createStackIndex ( const SoType  typeId )

staticprotected

Returns the value of a new available stack index.

getNextInStack()

SoElement * SoElement::getNextInStack ( void  ) const

protected

Returns the next element down in the stack. Should be used in push() to get the previous element.

This method has a slightly misleading name, but we didn't change it to stay compatible with the original SGI Inventor API.

getNextFree()

SoElement * SoElement::getNextFree ( void  ) const

protected

Returns the next free element, i.e. the next element up in the stack.

Member Data Documentation

classStackIndex

int SoElement::classStackIndex

staticprotected

This is the static state stack index for the class.

typeId

SoType SoElement::typeId

protected

The element's unique SoType type identification.

stackIndex

int SoElement::stackIndex

protected

The index in the state stack for this particular element instance.

stackToType

SoTypeList * SoElement::stackToType

staticprotected

Provides mapping from state stack indices to element types.

depth

int SoElement::depth

protected

The depth of the element instance in the state stack.

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

• SoElement.h
• SoElement.cpp