osg::Viewport Class Reference

Encapsulate OpenGL glViewport. More...

Inheritance diagram for osg::Viewport:

[legend]List of all members.

Public Member Functions
	Viewport ()
	Viewport (int x, int y, int width, int height)
	Viewport (const Viewport &vp, const CopyOp &copyop=CopyOp::SHALLOW_COPY)
	Copy constructor using CopyOp to manage deep vs shallow copy.
	META_StateAttribute (osg, Viewport, VIEWPORT)
virtual int	compare (const StateAttribute &sa) const
	Return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.
void	setViewport (int x, int y, int width, int height)
void	getViewport (int &x, int &y, int &width, int &height) const
int &	x ()
int	x () const
int &	y ()
int	y () const
int &	width ()
int	width () const
int &	height ()
int	height () const
bool	valid () const
float	aspectRatio () const
	Return the aspectRatio of the viewport, which is equal to width/height.
const osg::Matrix	computeWindowMatrix () const
	Compute the Window Matrix which takes projected coords into Window coordinates.
virtual void	apply (State &state) const
	apply the OpenGL state attributes.
Protected Member Functions
virtual	~Viewport ()
Protected Attributes
int	_x
int	_y
int	_width
int	_height

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Detailed Description

Encapsulate OpenGL glViewport.

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Constructor & Destructor Documentation

osg::Viewport::Viewport (   )

osg::Viewport::Viewport (  int  x, int  y, int  width, int  height )  [inline]

osg::Viewport::Viewport (  const Viewport &  vp, const CopyOp &  copyop = CopyOp::SHALLOW_COPY )  [inline]

Copy constructor using CopyOp to manage deep vs shallow copy.

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

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Member Function Documentation

virtual void osg::Viewport::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.

float osg::Viewport::aspectRatio (   )  const [inline]

Return the aspectRatio of the viewport, which is equal to width/height. If height is zero, the potental division by zero is avoided by simply returning 1.0f.

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

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

const osg::Matrix osg::Viewport::computeWindowMatrix (   )  const [inline]

Compute the Window Matrix which takes projected coords into Window coordinates. To convert local coordinates into window coordinates use v_window = v_local * MVPW matrix, where the MVPW matrix is ModelViewMatrix * ProjectionMatrix * WindowMatrix, the latter supplied by Viewport::computeWindowMatrix(), the ModelView and Projection Matrix can either be sourced from the current osg::State object, via osgUtil::SceneView or CullVisitor.

void osg::Viewport::getViewport (  int &  x, int &  y, int &  width, int &  height )  const [inline]

int osg::Viewport::height (   )  const [inline]

int& osg::Viewport::height (   )  [inline]

osg::Viewport::META_StateAttribute (  osg  , Viewport  , VIEWPORT  )

void osg::Viewport::setViewport (  int  x, int  y, int  width, int  height )  [inline]

bool osg::Viewport::valid (   )  const [inline]

int osg::Viewport::width (   )  const [inline]

int& osg::Viewport::width (   )  [inline]

int osg::Viewport::x (   )  const [inline]

int& osg::Viewport::x (   )  [inline]

int osg::Viewport::y (   )  const [inline]

int& osg::Viewport::y (   )  [inline]

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Member Data Documentation

int osg::Viewport::_height [protected]

int osg::Viewport::_width [protected]

int osg::Viewport::_x [protected]

int osg::Viewport::_y [protected]

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

• Viewport

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