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/*=========================================================================
Program: Visualization Toolkit
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#ifndef vtkOpenGLResourceFreeCallback_h
#define vtkOpenGLResourceFreeCallback_h
// Description:
// Provide a mechanism for making sure graphics resources are
// freed properly.
class vtkOpenGLRenderWindow;
class vtkWindow;
class vtkGenericOpenGLResourceFreeCallback
{
public:
vtkGenericOpenGLResourceFreeCallback() {
this->VTKWindow = NULL; this->Releasing = false; }
virtual ~vtkGenericOpenGLResourceFreeCallback() { }
// Called when the event is invoked
virtual void Release() = 0;
virtual void RegisterGraphicsResources(vtkOpenGLRenderWindow *rw) = 0;
bool IsReleasing() {
return this->Releasing; }
protected:
vtkOpenGLRenderWindow *VTKWindow;
bool Releasing;
};
// Description:
// Templated member callback.
template <class T>
class vtkOpenGLResourceFreeCallback : public vtkGenericOpenGLResourceFreeCallback
{
public:
vtkOpenGLResourceFreeCallback(T* handler, void (T::*method)(vtkWindow *))
{
this->Handler = handler;
this->Method = method;
}
virtual ~vtkOpenGLResourceFreeCallback() { }
virtual void RegisterGraphicsResources(vtkOpenGLRenderWindow *rw) {
if (this->VTKWindow == rw)
{
return;
}
if (this->VTKWindow)
{
this->Release();
}
this->VTKWindow = rw;
this->VTKWindow->RegisterGraphicsResources(this);
}
// Called when the event is invoked
virtual void Release()
{
if (this->VTKWindow && this->Handler && !this->Releasing)
{
this->Releasing = true;
this->VTKWindow->PushContext();
(this->Handler->*this->Method)(this->VTKWindow);
this->VTKWindow->UnregisterGraphicsResources(this);
this->VTKWindow->PopContext();
this->VTKWindow = NULL;
this->Releasing = false;
}
}
protected:
T* Handler;
void (T::*Method)(vtkWindow *);
};
#endif
// VTK-HeaderTest-Exclude: vtkOpenGLResourceFreeCallback.h
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