dox/Rendering/vtkOpenGLExtensionManager.h

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// -*- c++ -*-

/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkOpenGLExtensionManager.h,v $

  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.

  Copyright 2003 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
  license for use of this work by or on behalf of the
  U.S. Government. Redistribution and use in source and binary forms, with
  or without modification, are permitted provided that this Notice and any
  statement of authorship are reproduced on all copies.

=========================================================================*/

#ifndef __vtkOpenGLExtensionManager_h
#define __vtkOpenGLExtensionManager_h

#include <vtkObject.h>
#include <vtkWeakPointer.h> // needed for vtkWeakPointer.

class vtkRenderWindow;

//BTX
extern "C" {
#ifdef _WIN32
#include <vtkOpenGL.h>  // Needed for WINAPI
  typedef int (WINAPI *vtkOpenGLExtensionManagerFunctionPointer)(void);
#else
  typedef void (*vtkOpenGLExtensionManagerFunctionPointer)(void);
#endif
}
//ETX

class VTK_RENDERING_EXPORT vtkOpenGLExtensionManager : public vtkObject
{
public:
  vtkTypeRevisionMacro(vtkOpenGLExtensionManager, vtkObject);
  static vtkOpenGLExtensionManager *New();
  void PrintSelf(ostream &os, vtkIndent indent);


  vtkRenderWindow* GetRenderWindow();
  virtual void SetRenderWindow(vtkRenderWindow *renwin);

  virtual void Update();


  vtkGetStringMacro(ExtensionsString);

  virtual int ExtensionSupported(const char *name);

//BTX

  virtual vtkOpenGLExtensionManagerFunctionPointer GetProcAddress(
    const char *fname);
//ETX

  virtual void LoadExtension(const char *name);

  virtual int LoadSupportedExtension(const char *name);

  
  virtual void LoadCorePromotedExtension(const char *name);
//BTX
protected:
  vtkOpenGLExtensionManager();
  virtual ~vtkOpenGLExtensionManager();

  vtkWeakPointer<vtkRenderWindow> RenderWindow;

  int OwnRenderWindow;
  char *ExtensionsString;

  vtkTimeStamp BuildTime;

  virtual void ReadOpenGLExtensions();
  
  virtual int SafeLoadExtension(const char *name);

private:
  vtkOpenGLExtensionManager(const vtkOpenGLExtensionManager&); // Not implemented
  void operator=(const vtkOpenGLExtensionManager&); // Not implemented
//ETX
};

#endif //__vtkOpenGLExtensionManager

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