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

  Program:   Visualization Toolkit
  Module:    vtkOpenGLImageGradient.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.

=========================================================================*/
/**
 * @class   vtkOpenGLImageGradient
 * @brief   Compute Gradient using the GPU
 */

#ifndef vtkOpenGLImageGradient_h
#define vtkOpenGLImageGradient_h

#include "vtkImageGradient.h"
#include "vtkImagingOpenGL2Module.h" // For export macro

class vtkOpenGLImageAlgorithmHelper;
class vtkRenderWindow;

class VTKIMAGINGOPENGL2_EXPORT vtkOpenGLImageGradient : public vtkImageGradient
{
public:
  static vtkOpenGLImageGradient* New();
  vtkTypeMacro(vtkOpenGLImageGradient, vtkImageGradient);

  /**
   * Set the render window to get the OpenGL resources from
   */
  void SetRenderWindow(vtkRenderWindow*);

protected:
  void PrintSelf(ostream& os, vtkIndent indent) override;
  vtkOpenGLImageGradient();
  ~vtkOpenGLImageGradient() override;

  vtkOpenGLImageAlgorithmHelper* Helper;

  void ThreadedRequestData(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector, vtkImageData*** inData, vtkImageData** outData,
    int extent[6], int id) override;

private:
  vtkOpenGLImageGradient(const vtkOpenGLImageGradient&) = delete;
  void operator=(const vtkOpenGLImageGradient&) = delete;
};

#endif