mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
98 lines
2.8 KiB
C++
98 lines
2.8 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_PointElevation_h
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#define vtk_m_worklet_PointElevation_h
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#include <vtkm/worklet/WorkletMapField.h>
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#include <vtkm/Math.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 internal
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{
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template <typename T>
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VTKM_EXEC T clamp(const T& val, const T& min, const T& max)
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{
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return vtkm::Min(max, vtkm::Max(min, val));
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}
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}
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class PointElevation : public vtkm::worklet::WorkletMapField
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{
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public:
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typedef void ControlSignature(FieldIn<Vec3>, FieldOut<Scalar>);
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typedef _2 ExecutionSignature(_1);
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VTKM_CONT
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PointElevation()
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: LowPoint(0.0, 0.0, 0.0)
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, HighPoint(0.0, 0.0, 1.0)
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, RangeLow(0.0)
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, RangeHigh(1.0)
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{
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}
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VTKM_CONT
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void SetLowPoint(const vtkm::Vec<vtkm::Float64, 3>& point) { this->LowPoint = point; }
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VTKM_CONT
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void SetHighPoint(const vtkm::Vec<vtkm::Float64, 3>& point) { this->HighPoint = point; }
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VTKM_CONT
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void SetRange(vtkm::Float64 low, vtkm::Float64 high)
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{
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this->RangeLow = low;
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this->RangeHigh = high;
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}
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VTKM_EXEC
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vtkm::Float64 operator()(const vtkm::Vec<vtkm::Float64, 3>& vec) const
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{
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vtkm::Vec<vtkm::Float64, 3> direction = this->HighPoint - this->LowPoint;
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vtkm::Float64 lengthSqr = vtkm::dot(direction, direction);
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vtkm::Float64 rangeLength = this->RangeHigh - this->RangeLow;
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vtkm::Float64 s = vtkm::dot(vec - this->LowPoint, direction) / lengthSqr;
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s = internal::clamp(s, 0.0, 1.0);
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return this->RangeLow + (s * rangeLength);
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}
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template <typename T>
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VTKM_EXEC vtkm::Float64 operator()(const vtkm::Vec<T, 3>& vec) const
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{
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return (*this)(vtkm::make_Vec(static_cast<vtkm::Float64>(vec[0]),
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static_cast<vtkm::Float64>(vec[1]),
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static_cast<vtkm::Float64>(vec[2])));
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}
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private:
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vtkm::Vec<vtkm::Float64, 3> LowPoint, HighPoint;
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vtkm::Float64 RangeLow, RangeHigh;
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};
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}
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} // namespace vtkm::worklet
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#endif // vtk_m_worklet_PointElevation_h
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