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

  Program:   Visualization Toolkit
  Module:    vtkDataTransferHelper.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.

=========================================================================*/
#ifndef vtkDataTransferHelper_h
#define vtkDataTransferHelper_h

#include "vtkRenderingOpenGLModule.h" // For export macro
#include "vtkObject.h"
#include "vtkWeakPointer.h" // needed for vtkWeakPointer.
#include "vtkSmartPointer.h" // needed for vtkSmartPointer.

class vtkDataArray;
class vtkPixelBufferObject;
class vtkTextureObject;
class vtkOpenGLExtensionManager;
class vtkRenderWindow;

class VTKRENDERINGOPENGL_EXPORT vtkDataTransferHelper : public vtkObject
{
public:
  static vtkDataTransferHelper* New();
  vtkTypeMacro(vtkDataTransferHelper, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);


  void SetContext(vtkRenderWindow* context);
  vtkRenderWindow* GetContext();


  vtkSetVector6Macro(CPUExtent, int);
  vtkGetVector6Macro(CPUExtent, int);


  vtkSetVector6Macro(GPUExtent, int);
  vtkGetVector6Macro(GPUExtent, int);


  vtkSetVector6Macro(TextureExtent, int);
  vtkGetVector6Macro(TextureExtent, int);

  bool GetExtentIsValid(int *extent);

  bool GetCPUExtentIsValid();

  bool GetGPUExtentIsValid();

  bool GetTextureExtentIsValid();


  vtkSetMacro(MinTextureDimension,int);
  vtkGetMacro(MinTextureDimension,int);


  vtkGetObjectMacro(Array, vtkDataArray);
  void SetArray(vtkDataArray* array);


  vtkGetObjectMacro(Texture, vtkTextureObject);
  void SetTexture(vtkTextureObject* texture);


  bool Upload(int components=0,
              int *componentList=NULL);

  bool Download();


  bool DownloadAsync1();
  bool DownloadAsync2();

  bool GetShaderSupportsTextureInt();
  void SetShaderSupportsTextureInt(bool value);


  static bool IsSupported(vtkRenderWindow* renWin);
//BTX
protected:
  vtkDataTransferHelper();
  ~vtkDataTransferHelper();

  bool LoadRequiredExtensions(vtkOpenGLExtensionManager*);

  int CPUExtent[6];
  int GPUExtent[6];
  int TextureExtent[6];

  vtkWeakPointer<vtkRenderWindow> Context;
  vtkTextureObject* Texture;
  vtkDataArray* Array;
  bool ShaderSupportsTextureInt;
  int MinTextureDimension;

  vtkSmartPointer<vtkPixelBufferObject> AsyncDownloadPBO;

  vtkPixelBufferObject* GetPBO();

  // We try to reuse the PBO if possible.
  vtkSmartPointer<vtkPixelBufferObject> PBO;
private:
  vtkDataTransferHelper(const vtkDataTransferHelper&); // Not implemented.
  void operator=(const vtkDataTransferHelper&); // Not implemented.
//ETX
};

#endif