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

  Program:   Visualization Toolkit
  Module:    vtkSobelGradientMagnitudePass.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 vtkSobelGradientMagnitudePass_h
#define vtkSobelGradientMagnitudePass_h

#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkImageProcessingPass.h"

class vtkOpenGLRenderWindow;
class vtkDepthPeelingPassLayerList; // Pimpl
class vtkFrameBufferObject;
class vtkTextureObject;
namespace vtkgl
{
class CellBO;
}


class VTKRENDERINGOPENGL2_EXPORT vtkSobelGradientMagnitudePass : public vtkImageProcessingPass
{
public:
  static vtkSobelGradientMagnitudePass *New();
  vtkTypeMacro(vtkSobelGradientMagnitudePass,vtkImageProcessingPass);
  void PrintSelf(ostream& os, vtkIndent indent);

  //BTX

  virtual void Render(const vtkRenderState *s);
  //ETX

  void ReleaseGraphicsResources(vtkWindow *w);

 protected:
  vtkSobelGradientMagnitudePass();

  virtual ~vtkSobelGradientMagnitudePass();


  vtkFrameBufferObject *FrameBufferObject;
  vtkTextureObject *Pass1; // render target for the scene
  vtkTextureObject *Gx1; // render target 0 for the first shader
  vtkTextureObject *Gy1; // render target 1 for the first shader

  // Structures for the various cell types we render.
  vtkgl::CellBO *Program1; // shader to compute Gx1 and Gy1
  vtkgl::CellBO *Program2; // shader to compute |G| from Gx1 and Gy1

 private:
  vtkSobelGradientMagnitudePass(const vtkSobelGradientMagnitudePass&);  // Not implemented.
  void operator=(const vtkSobelGradientMagnitudePass&);  // Not implemented.
};

#endif