class TGLContext


 This class encapsulates window-system specific information about a
 GL-context and alows their proper management in ROOT.

Function Members (Methods)

public:

	TGLContext(TGLWidget* glWidget, Bool_t shareDefault = kTRUE, const TGLContext* shareList = 0)
virtual	~TGLContext()
static TClass*	Class()
Bool_t	ClearCurrent()
static TGLContext*	GetCurrent()
TGLContextIdentity*	GetIdentity() const
static void	GlewInit()
virtual TClass*	IsA() const
Bool_t	IsValid() const
Bool_t	MakeCurrent()
void	Release()
void	SetContext(TGLWidget* widget, const TGLContext* shareList)
virtual void	ShowMembers(TMemberInspector&)
virtual void	Streamer(TBuffer&)
void	StreamerNVirtual(TBuffer& ClassDef_StreamerNVirtual_b)
void	SwapBuffers()

private:

	TGLContext(const TGLContext&)
TGLContext&	operator=(const TGLContext&)

Data Members

private:

TGLPaintDevice*	fDevice
Bool_t	fFromCtor	To prohibit user's calls of SetContext.
TGLContextIdentity*	fIdentity
TGLContextPrivate*	fPimpl
Bool_t	fValid
static Bool_t	fgGlewInitDone

Class Charts

Inheritance Inherited Members Includes Libraries

Function documentation

TGLContext(TGLWidget* glWidget, Bool_t shareDefault = kTRUE, const TGLContext* shareList = 0)

 TGLContext ctor "from" TGLWidget.
 Is shareDefault is true, the shareList is set from default
 context-identity. Otherwise the given shareList is used (can be
 null).
 Makes thread switching.

void GlewInit()

 Initialize GLEW - static private function.
 Called immediately after creation of the first GL context.

void SetContext(TGLWidget* widget, const TGLContext* shareList)

WIN32 gl-context creation. Defined as a member-function (this code removed from ctor)
to make WIN32/X11 separation cleaner.
This function is public only for calls via gROOT and called from ctor.

Bool_t MakeCurrent()

If context is valid (TGLPaintDevice, for which context was created still exists),
make it current.

Bool_t ClearCurrent()

Reset current context.

void SwapBuffers()

If context is valid (TGLPaintDevice, for which context was created still exists),
swap buffers (in case of P-buffer call glFinish()).

void Release()

Make the context invalid and (do thread switch, if needed)
free resources.

~TGLContext()

TGLContext dtor. If it's called before TGLPaintDevice's dtor
(context is valid) resource will be freed and context
un-registered.

TGLContextIdentity * GetIdentity() const

We can have several shared contexts,
and gl-scene wants to know, if some context
(defined by its identity) can be used.

TGLContext * GetCurrent()

Ask TGLContextPrivate to lookup context in its internal map.

TGLContext(TGLWidget* glWidget, Bool_t shareDefault = kTRUE, const TGLContext* shareList = 0)

   TGLContext(TGLPBuffer *glPbuf, const TGLContext *shareList = 0);

Bool_t IsValid() const

{ return fValid; }