mirror of
https://gitlab.kitware.com/vtk/vtk-m
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44 lines
1.5 KiB
Markdown
44 lines
1.5 KiB
Markdown
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# Invoker now a member of all vtkm::filters
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To simplify how vtkm filters are written we have made each vtkm::filter
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have a `vtkm::cont::Invoker` as member variable. The goal with this change
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is provide an uniform API for launching all worklets from within a filter.
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Lets consider the PointElevation filter. Previous to these changes the
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`DoExecute` would need to construct the correct dispatcher with the
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correct parameters as seen below:
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```cpp
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template <typename T, typename StorageType, typename DerivedPolicy>
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inline VTKM_CONT vtkm::cont::DataSet PointElevation::DoExecute(
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const vtkm::cont::DataSet& inDataSet,
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const vtkm::cont::ArrayHandle<T, StorageType>& field,
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const vtkm::filter::FieldMetadata& fieldMetadata,
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vtkm::filter::PolicyBase<DerivedPolicy>)
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{
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vtkm::cont::ArrayHandle<vtkm::Float64> outArray;
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vtkm::worklet::DispatcherMapField<vtkm::worklet::PointElevation> dispatcher(this->Worklet);
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dispatcher.Invoke(field, outArray);
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...
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}
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```
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With these changes the filter can instead use `this->Invoke` and have
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the correct dispatcher executed. This makes it easier to teach and
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learn how to write new filters.
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```cpp
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template <typename T, typename StorageType, typename DerivedPolicy>
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inline VTKM_CONT vtkm::cont::DataSet PointElevation::DoExecute(
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const vtkm::cont::DataSet& inDataSet,
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const vtkm::cont::ArrayHandle<T, StorageType>& field,
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const vtkm::filter::FieldMetadata& fieldMetadata,
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vtkm::filter::PolicyBase<DerivedPolicy>)
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{
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vtkm::cont::ArrayHandle<vtkm::Float64> outArray;
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this->Invoke(this->Worklet, field, outArray);
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...
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}
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```
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