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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#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
{
/**
* \class GPUFiniteDifferenceFunction
*
* This is a base class of GPU finite difference function.
* Note that unlike most GPU classes, derived class of GPUFiniteDifferenceFunction
* does not have corresponding CPU class as its parent but only has CPU class
* FiniteDifferenceFunction as its base class. Therefore, only members of
* FiniteDifferenceFunction are reused by its derived GPU classes.
*
* \par How to use this class
* GPUFiniteDifferenceFunction must be subclassed to add functionality for
* GPUComputeUpdate.
*
* \ingroup ITKGPUFiniteDifference
**/
template <typename TImageType>
class ITK_TEMPLATE_EXPORT GPUFiniteDifferenceFunction : public FiniteDifferenceFunction<TImageType>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(GPUFiniteDifferenceFunction);
/** Standard class type aliases. */
using Self = GPUFiniteDifferenceFunction;
using Superclass = FiniteDifferenceFunction<TImageType>;
using DifferenceFunctionType = Superclass;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(GPUFiniteDifferenceFunction);
/** Extract some parameters from the image type */
using typename Superclass::ImageType;
using typename Superclass::PixelType;
using typename Superclass::PixelRealType;
/** Save image dimension. */
static constexpr unsigned int ImageDimension = ImageType::ImageDimension;
/** Define the TimeStepType to always be double. */
using typename Superclass::TimeStepType;
/** The default boundary condition for finite difference
* functions that is used unless overridden in the Evaluate() method. */
using typename Superclass::DefaultBoundaryConditionType;
/** Neighborhood radius type */
using typename Superclass::RadiusType;
/** Neighborhood type */
using typename Superclass::NeighborhoodType;
/** A floating point offset from an image grid location. Used for
* interpolation among grid values in a neighborhood. */
using typename Superclass::FloatOffsetType;
#if !defined(ITK_WRAPPING_PARSER)
/** Empty implementation - this will not be used by GPU filters */
PixelType
ComputeUpdate(const NeighborhoodType & itkNotUsed(neighborhood),
void * itkNotUsed(globalData),
const FloatOffsetType & itkNotUsed(offset = FloatOffsetType(0.0))) override
{
PixelType pix{};
return pix;
}
#endif
/** GPU function to compute update buffer */
virtual void
GPUComputeUpdate(const typename TImageType::Pointer output, typename TImageType::Pointer update, void * gd) = 0;
/** Allocate GPU buffers for computing metric statistics
* */
virtual void
GPUAllocateMetricData(unsigned int itkNotUsed(numPixels))
{}
/** Release GPU buffers for computing metric statistics
* */
virtual void
GPUReleaseMetricData()
{}
protected:
GPUFiniteDifferenceFunction() { m_GPUKernelManager = GPUKernelManager::New(); }
~GPUFiniteDifferenceFunction() override = default;
/** GPU kernel manager for GPUFiniteDifferenceFunction class */
typename GPUKernelManager::Pointer m_GPUKernelManager{};
/** GPU kernel handle for GPUComputeUpdate() */
int m_ComputeUpdateGPUKernelHandle{};
};
} // end namespace itk
#endif
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