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https://gitlab.kitware.com/vtk/vtk-m
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3e7cde8ecb
The PerlinNoise source has a mode where if a seed is not set, it will choose a new seed every time it is executed. It did this by using the value 0 as an indicator to do this (and initializing the Seed to 0). However, there was a problem with one of the benchmarks that was specifically setting the seed to 0 and getting unexpected results. Fix the problem by adding a separate, hidden member of the PerlinNoise class that keeps track of whether to generate new seeds or not.
80 lines
2.9 KiB
C++
80 lines
2.9 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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//
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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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#ifndef vtk_m_source_PerlinNoise_h
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#define vtk_m_source_PerlinNoise_h
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#include <vtkm/source/Source.h>
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namespace vtkm
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{
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namespace source
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{
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/**
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* @brief The PerlinNoise source creates a uniform dataset.
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*
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* This class generates a uniform grid dataset with a tileable perlin
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* noise scalar point field.
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*
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* The Execute method creates a complete structured dataset that have a
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* scalar point field named 'perlinnoise'.
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**/
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class VTKM_SOURCE_EXPORT PerlinNoise final : public vtkm::source::Source
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{
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public:
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VTKM_CONT PerlinNoise() = default;
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VTKM_CONT ~PerlinNoise() = default;
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VTKM_CONT PerlinNoise(const PerlinNoise&) = default;
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VTKM_CONT PerlinNoise(PerlinNoise&&) = default;
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VTKM_CONT PerlinNoise& operator=(const PerlinNoise&) = default;
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VTKM_CONT PerlinNoise& operator=(PerlinNoise&&) = default;
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VTKM_DEPRECATED(2.0, "Use SetCellDimensions or SetPointDimensions.")
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VTKM_CONT PerlinNoise(vtkm::Id3 dims);
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VTKM_DEPRECATED(2.0, "Use Set*Dimensions and SetSeed.")
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VTKM_CONT PerlinNoise(vtkm::Id3 dims, vtkm::IdComponent seed);
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VTKM_DEPRECATED(2.0, "Use Set*Dimensions and SetOrigin.")
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VTKM_CONT PerlinNoise(vtkm::Id3 dims, vtkm::Vec3f origin);
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VTKM_DEPRECATED(2.0, "Use Set*Dimensions, SetOrigin, and SetSeed.")
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VTKM_CONT PerlinNoise(vtkm::Id3 dims, vtkm::Vec3f origin, vtkm::IdComponent seed);
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VTKM_CONT vtkm::Id3 GetPointDimensions() const { return this->PointDimensions; }
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VTKM_CONT void SetPointDimensions(vtkm::Id3 dims) { this->PointDimensions = dims; }
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VTKM_CONT vtkm::Id3 GetCellDimensions() const { return this->PointDimensions - vtkm::Id3(1); }
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VTKM_CONT void SetCellDimensions(vtkm::Id3 dims) { this->PointDimensions = dims + vtkm::Id3(1); }
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VTKM_CONT vtkm::Vec3f GetOrigin() const { return this->Origin; }
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VTKM_CONT void SetOrigin(const vtkm::Vec3f& origin) { this->Origin = origin; }
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/// \brief The seed used for the pseudorandom number generation of the noise.
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///
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/// If the seed is not set, then a new, unique seed is picked each time `Execute` is run.
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VTKM_CONT vtkm::IdComponent GetSeed() const { return this->Seed; }
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VTKM_CONT void SetSeed(vtkm::IdComponent seed)
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{
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this->Seed = seed;
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this->SeedSet = true;
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}
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private:
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vtkm::cont::DataSet DoExecute() const override;
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vtkm::Id3 PointDimensions = { 16, 16, 16 };
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vtkm::Vec3f Origin = { 0, 0, 0 };
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vtkm::IdComponent Seed = 0;
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bool SeedSet = false;
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};
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} //namespace source
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} //namespace vtkm
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#endif //vtk_m_source_PerlinNoise_h
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