osg::BlendFunc Class Reference

Inheritance diagram for osg::BlendFunc:


Public Types
enum	BlendFuncMode { DST_ALPHA = GL_DST_ALPHA, DST_COLOR = GL_DST_COLOR, ONE = GL_ONE, ONE_MINUS_DST_ALPHA = GL_ONE_MINUS_DST_ALPHA, ONE_MINUS_DST_COLOR = GL_ONE_MINUS_DST_COLOR, ONE_MINUS_SRC_ALPHA = GL_ONE_MINUS_SRC_ALPHA, ONE_MINUS_SRC_COLOR = GL_ONE_MINUS_SRC_COLOR, SRC_ALPHA = GL_SRC_ALPHA, SRC_ALPHA_SATURATE = GL_SRC_ALPHA_SATURATE, SRC_COLOR = GL_SRC_COLOR, CONSTANT_COLOR = GL_CONSTANT_COLOR, ONE_MINUS_CONSTANT_COLOR = GL_ONE_MINUS_CONSTANT_COLOR, CONSTANT_ALPHA = GL_CONSTANT_ALPHA, ONE_MINUS_CONSTANT_ALPHA = GL_ONE_MINUS_CONSTANT_ALPHA, ZERO = GL_ZERO }
Public Member Functions
	BlendFunc ()
	BlendFunc (GLenum source, GLenum destination)
	BlendFunc (GLenum source, GLenum destination, GLenum source_alpha, GLenum destination_alpha)
	BlendFunc (const BlendFunc &trans, const CopyOp &copyop=CopyOp::SHALLOW_COPY)
	META_StateAttribute (osg, BlendFunc, BLENDFUNC)
virtual int	compare (const StateAttribute &sa) const
virtual bool	getModeUsage (ModeUsage &usage) const
void	setFunction (GLenum source, GLenum destination)
void	setFunction (GLenum source_rgb, GLenum destination_rgb, GLenum source_alpha, GLenum destination_alpha)
void	setSource (GLenum source)
GLenum	getSource () const
void	setSourceRGB (GLenum source)
GLenum	getSourceRGB () const
void	setSourceAlpha (GLenum source)
GLenum	getSourceAlpha () const
void	setDestination (GLenum destination)
GLenum	getDestination () const
void	setDestinationRGB (GLenum destination)
GLenum	getDestinationRGB () const
void	setDestinationAlpha (GLenum destination)
GLenum	getDestinationAlpha () const
virtual void	apply (State &state) const
Static Public Member Functions
static Extensions *	getExtensions (unsigned int contextID, bool createIfNotInitalized)
static void	setExtensions (unsigned int contextID, Extensions *extensions)
Protected Member Functions
virtual	~BlendFunc ()
Protected Attributes
GLenum	_source_factor
GLenum	_destination_factor
GLenum	_source_factor_alpha
GLenum	_destination_factor_alpha
Classes
class	Extensions

Detailed Description

Encapsulates OpenGL blend/transparency state.

Member Enumeration Documentation

enum osg::BlendFunc::BlendFuncMode

Enumerator:

DST_ALPHA

DST_COLOR

ONE

ONE_MINUS_DST_ALPHA

ONE_MINUS_DST_COLOR

ONE_MINUS_SRC_ALPHA

ONE_MINUS_SRC_COLOR

SRC_ALPHA

SRC_ALPHA_SATURATE

SRC_COLOR

CONSTANT_COLOR

ONE_MINUS_CONSTANT_COLOR

CONSTANT_ALPHA

ONE_MINUS_CONSTANT_ALPHA

ZERO

Constructor & Destructor Documentation

osg::BlendFunc::BlendFunc ( )

osg::BlendFunc::BlendFunc ( GLenum source,

GLenum destination

)

osg::BlendFunc::BlendFunc ( GLenum source,

GLenum destination,

GLenum source_alpha,

GLenum destination_alpha

)

osg::BlendFunc::BlendFunc ( const BlendFunc & trans,

const CopyOp & copyop = CopyOp::SHALLOW_COPY

) [inline]

Copy constructor using CopyOp to manage deep vs shallow copy.

virtual osg::BlendFunc::~BlendFunc ( ) [protected, virtual]

Member Function Documentation

virtual void osg::BlendFunc::apply ( State & state ) const [virtual]

apply the OpenGL state attributes. The global state for the current OpenGL context is passed in to allow the StateAttribute to obtain details on the the current context and state.
Implements osg::StateAttribute.

virtual int osg::BlendFunc::compare ( const StateAttribute & sa ) const [inline, virtual]

Return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.
Implements osg::StateAttribute.

GLenum osg::BlendFunc::getDestination ( ) const [inline]

GLenum osg::BlendFunc::getDestinationAlpha ( ) const [inline]

GLenum osg::BlendFunc::getDestinationRGB ( ) const [inline]

static Extensions* osg::BlendFunc::getExtensions ( unsigned int contextID,

bool createIfNotInitalized

) [static]

Returns the Extensions object for the given context. If createIfNotInitalized is true and the Exentsions object doesn't exist, getExtensions() creates it on the given context. Returns NULL if createIfNotInitalized is false and the Extensions object doesn't exist.

virtual bool osg::BlendFunc::getModeUsage ( ModeUsage & usage ) const [inline, virtual]

GLenum osg::BlendFunc::getSource ( ) const [inline]

GLenum osg::BlendFunc::getSourceAlpha ( ) const [inline]

GLenum osg::BlendFunc::getSourceRGB ( ) const [inline]

osg::BlendFunc::META_StateAttribute ( osg ,

BlendFunc ,

BLENDFUNC

)

void osg::BlendFunc::setDestination ( GLenum destination ) [inline]

void osg::BlendFunc::setDestinationAlpha ( GLenum destination ) [inline]

void osg::BlendFunc::setDestinationRGB ( GLenum destination ) [inline]

static void osg::BlendFunc::setExtensions ( unsigned int contextID,

Extensions * extensions

) [static]

setExtensions() allows users to override the extensions across graphics contexts. Typically used when you have different extensions supported across graphics pipes, but need to ensure that they all use the same low common denominator extensions.