itkGPUFiniteDifferenceFunction.h

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 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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 *  See the License for the specific language governing permissions and
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#ifndef __itkGPUFiniteDifferenceFunction_h
#define __itkGPUFiniteDifferenceFunction_h

#include "itkFiniteDifferenceFunction.h"
#include "itkLightObject.h"
#include "itkConstNeighborhoodIterator.h"
#include "itkVector.h"

#include "itkGPUDataManager.h"
#include "itkGPUKernelManager.h"

namespace itk
{
template< typename TImageType >
class GPUFiniteDifferenceFunction : public FiniteDifferenceFunction< TImageType >
{
public:

  typedef GPUFiniteDifferenceFunction            Self;
  typedef FiniteDifferenceFunction< TImageType > Superclass;
  typedef Superclass                             DifferenceFunctionType;
  typedef SmartPointer< Self >                   Pointer;
  typedef SmartPointer< const Self >             ConstPointer;

  itkTypeMacro(GPUFiniteDifferenceFunction, FiniteDifferenceFunction);

  typedef typename Superclass::ImageType     ImageType;
  typedef typename Superclass::PixelType     PixelType;
  typedef typename Superclass::PixelRealType PixelRealType;

  itkStaticConstMacro(ImageDimension, unsigned int, ImageType::ImageDimension);

  typedef typename Superclass::TimeStepType TimeStepType;

  typedef typename Superclass::DefaultBoundaryConditionType DefaultBoundaryConditionType;

  typedef typename Superclass::RadiusType RadiusType;

  typedef typename Superclass::NeighborhoodType NeighborhoodType;

  typedef typename Superclass::FloatOffsetType FloatOffsetType;

  virtual void InitializeIteration() {}

#if !defined( CABLE_CONFIGURATION )

  virtual PixelType  ComputeUpdate( const NeighborhoodType & itkNotUsed(neighborhood),
                                    void *itkNotUsed(globalData),
                                    const FloatOffsetType & itkNotUsed(offset = FloatOffsetType(0.0)) )
  {
    PixelType pix = itk::NumericTraits<PixelType>::Zero;
    return pix;
  }
#endif


  virtual void GPUComputeUpdate( const typename TImageType::Pointer output,
                                 typename TImageType::Pointer update,
                                 void *gd) = 0;

  virtual void GPUAllocateMetricData(unsigned int itkNotUsed(numPixels)) {}

  virtual void GPUReleaseMetricData() {}

protected:
  GPUFiniteDifferenceFunction() {
    m_GPUKernelManager = GPUKernelManager::New();
  }
  ~GPUFiniteDifferenceFunction() {
  }

  void PrintSelf(std::ostream & os, Indent indent) const
  {
    Superclass::PrintSelf(os, indent);
  }

  typename GPUKernelManager::Pointer m_GPUKernelManager;

  int m_ComputeUpdateGPUKernelHandle;

private:
  GPUFiniteDifferenceFunction(const Self &); //purposely not implemented
  void operator=(const Self &);              //purposely not implemented

};
} // end namespace itk

#endif