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

  Program:   Visualization Toolkit
  Module:    vtkGPUInfoList.h

  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.

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

// .NAME vtkGPUInfoList - Stores the list of GPUs VRAM information.
// .SECTION Description
// vtkGPUInfoList stores a list of vtkGPUInfo. An host can have
// several GPUs. It creates and sets the list by probing the host with system
// calls. This an abstract class. Concrete classes are OS specific.
// .SECTION See Also
// vtkGPUInfo vtkDirectXGPUInfoList vtkCoreGraphicsGPUInfoList

#ifndef __vtkGPUInfoList_h
#define __vtkGPUInfoList_h

#include "vtkObject.h"

class vtkGPUInfoListArray; // STL Pimpl
class vtkGPUInfo;

class VTK_RENDERING_EXPORT vtkGPUInfoList : public vtkObject
{
public:
  static vtkGPUInfoList *New();
  vtkTypeMacro(vtkGPUInfoList, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);
  
  // Description:
  // Build the list of vtkInfoGPU if not done yet.
  // Default implementation created an empty list. Useful if there is no
  // implementation available for a given architecture yet.
  // \post probed: IsProbed()
  virtual void Probe()=0;
  
  // Description:
  // Tells if the operating system has been probed. Initial value is false.
  virtual bool IsProbed();
  
  // Description:
  // Return the number of GPUs.
  // \pre probed: IsProbed()
  virtual int GetNumberOfGPUs();
  
  // Description:
  // Return information about GPU i.
  // \pre probed: IsProbed()
  // \pre valid_index: i>=0 && i<GetNumberOfGPUs()
  // \post result_exists: result!=0
  virtual vtkGPUInfo *GetGPUInfo(int i);
  
protected:
  // Description:
  // Default constructor. Set Probed to false. Set Array to NULL.
  vtkGPUInfoList();
  virtual ~vtkGPUInfoList();
  
  bool Probed;
  vtkGPUInfoListArray *Array;
  
private:
  vtkGPUInfoList(const vtkGPUInfoList&); // Not implemented.
  void operator=(const vtkGPUInfoList&); // Not implemented.
};

#endif