mirror of
https://gitlab.kitware.com/vtk/vtk-m
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105 lines
2.6 KiB
C++
105 lines
2.6 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_worklet_particleadvection_Integrators_h
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#define vtk_m_worklet_particleadvection_Integrators_h
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#include <vtkm/Types.h>
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namespace vtkm
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{
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namespace worklet
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{
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namespace particleadvection
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{
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template <typename FieldEvaluateType, typename FieldType>
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class RK4Integrator
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{
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public:
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VTKM_EXEC_CONT
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RK4Integrator()
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: h(0)
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, h_2(0)
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{
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}
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VTKM_EXEC_CONT
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RK4Integrator(const FieldEvaluateType& field, FieldType _h)
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: f(field)
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, h(_h)
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, h_2(_h / 2.f)
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{
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}
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template <typename PortalType>
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VTKM_EXEC bool Step(const vtkm::Vec<FieldType, 3>& pos,
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const PortalType& field,
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vtkm::Vec<FieldType, 3>& out) const
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{
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vtkm::Vec<FieldType, 3> k1, k2, k3, k4;
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if (f.Evaluate(pos, field, k1) && f.Evaluate(pos + h_2 * k1, field, k2) &&
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f.Evaluate(pos + h_2 * k2, field, k3) && f.Evaluate(pos + h * k3, field, k4))
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{
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out = pos + h / 6.0f * (k1 + 2 * k2 + 2 * k3 + k4);
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return true;
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}
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return false;
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}
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FieldEvaluateType f;
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FieldType h, h_2;
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};
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template <typename FieldEvaluateType, typename FieldType>
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class EulerIntegrator
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{
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public:
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VTKM_EXEC_CONT
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EulerIntegrator(const FieldEvaluateType& field, FieldType _h)
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: f(field)
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, h(_h)
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{
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}
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template <typename PortalType>
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VTKM_EXEC bool Step(const vtkm::Vec<FieldType, 3>& pos,
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const PortalType& field,
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vtkm::Vec<FieldType, 3>& out) const
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{
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vtkm::Vec<FieldType, 3> vCur;
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if (f.Evaluate(pos, field, vCur))
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{
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out = pos + h * vCur;
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return true;
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}
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return false;
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}
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FieldEvaluateType f;
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FieldType h;
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};
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}
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}
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}
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#endif // vtk_m_worklet_particleadvection_Integrators_h
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