d1a4aecc59
We have made several improvements to adding data into an `ArrayHandle`. ## Moving data from an `std::vector` For numerous reasons, it is convenient to define data in a `std::vector` and then wrap that into an `ArrayHandle`. It is often the case that an `std::vector` is filled and then becomes unused once it is converted to an `ArrayHandle`. In this case, what we really want is to pass the data off to the `ArrayHandle` so that the `ArrayHandle` is now managing the data and not the `std::vector`. C++11 has a mechanism to do this: move semantics. You can now pass variables to functions as an "rvalue" (right-hand value). When something is passed as an rvalue, it can pull state out of that variable and move it somewhere else. `std::vector` implements this movement so that an rvalue can be moved to another `std::vector` without actually copying the data. `make_ArrayHandle` now also takes advantage of this feature to move rvalue `std::vector`s. There is a special form of `make_ArrayHandle` named `make_ArrayHandleMove` that takes an rvalue. There is also a special overload of `make_ArrayHandle` itself that handles an rvalue `vector`. (However, using the explicit move version is better if you want to make sure the data is actually moved.) ## Make `ArrayHandle` from initalizer list A common use case for using `std::vector` (particularly in our unit tests) is to quickly add an initalizer list into an `ArrayHandle`. Now you can by simply passing an initializer list to `make_ArrayHandle`. ## Deprecated `make_ArrayHandle` with default shallow copy For historical reasons, passing an `std::vector` or a pointer to `make_ArrayHandle` does a shallow copy (i.e. `CopyFlag` defaults to `Off`). Although more efficient, this mode is inherintly unsafe, and making it the default is asking for trouble. To combat this, calling `make_ArrayHandle` without a copy flag is deprecated. In this way, if you wish to do the faster but more unsafe creation of an `ArrayHandle` you should explicitly express that. This requried quite a few changes through the VTK-m source (particularly in the tests). ## Similar changes to `Field` `vtkm::cont::Field` has a `make_Field` helper function that is similar to `make_ArrayHandle`. It also features the ability to create fields from `std::vector`s and C arrays. It also likewise had the same unsafe behavior by default of not copying from the source of the arrays. That behavior has similarly been depreciated. You now have to specify a copy flag. The ability to construct a `Field` from an initializer list of values has also been added.
106 lines
3.7 KiB
C++
106 lines
3.7 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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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/ArrayHandleIndex.h>
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#include <vtkm/cont/VariantArrayHandle.h>
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#include <vtkm/worklet/DispatcherMapField.h>
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#include <vtkm/worklet/WorkletMapField.h>
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#include <vtkm/cont/testing/Testing.h>
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class TestWholeArrayWorklet : public vtkm::worklet::WorkletMapField
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{
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public:
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using ControlSignature = void(WholeArrayIn, WholeArrayInOut, WholeArrayOut);
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using ExecutionSignature = void(WorkIndex, _1, _2, _3);
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template <typename InPortalType, typename InOutPortalType, typename OutPortalType>
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VTKM_EXEC void operator()(const vtkm::Id& index,
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const InPortalType& inPortal,
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const InOutPortalType& inOutPortal,
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const OutPortalType& outPortal) const
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{
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using inT = typename InPortalType::ValueType;
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if (!test_equal(inPortal.Get(index), TestValue(index, inT())))
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{
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this->RaiseError("Got wrong input value.");
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}
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using inOutT = typename InOutPortalType::ValueType;
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if (!test_equal(inOutPortal.Get(index), TestValue(index, inOutT()) + inOutT(100)))
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{
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this->RaiseError("Got wrong input/output value.");
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}
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inOutPortal.Set(index, TestValue(index, inOutT()));
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using outT = typename OutPortalType::ValueType;
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outPortal.Set(index, TestValue(index, outT()));
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}
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};
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namespace map_whole_array
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{
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static constexpr vtkm::Id ARRAY_SIZE = 10;
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struct DoTestWholeArrayWorklet
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{
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using WorkletType = TestWholeArrayWorklet;
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template <typename T>
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VTKM_CONT void operator()(T) const
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{
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std::cout << "Set up data." << std::endl;
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T inArray[ARRAY_SIZE];
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T inOutArray[ARRAY_SIZE];
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for (vtkm::Id index = 0; index < ARRAY_SIZE; index++)
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{
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inArray[index] = TestValue(index, T());
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inOutArray[index] = static_cast<T>(TestValue(index, T()) + T(100));
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}
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vtkm::cont::ArrayHandle<T> inHandle =
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vtkm::cont::make_ArrayHandle(inArray, ARRAY_SIZE, vtkm::CopyFlag::On);
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vtkm::cont::ArrayHandle<T> inOutHandle =
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vtkm::cont::make_ArrayHandle(inOutArray, ARRAY_SIZE, vtkm::CopyFlag::On);
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vtkm::cont::ArrayHandle<T> outHandle;
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// Output arrays must be preallocated.
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outHandle.Allocate(ARRAY_SIZE);
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vtkm::worklet::DispatcherMapField<WorkletType> dispatcher;
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dispatcher.Invoke(vtkm::cont::VariantArrayHandle(inHandle).ResetTypes(vtkm::List<T>{}),
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vtkm::cont::VariantArrayHandle(inOutHandle).ResetTypes(vtkm::List<T>{}),
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vtkm::cont::VariantArrayHandle(outHandle).ResetTypes(vtkm::List<T>{}));
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std::cout << "Check result." << std::endl;
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CheckPortal(inOutHandle.ReadPortal());
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CheckPortal(outHandle.ReadPortal());
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}
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};
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void TestWorkletMapFieldExecArg(vtkm::cont::DeviceAdapterId id)
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{
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std::cout << "Testing Worklet with WholeArray on device adapter: " << id.GetName() << std::endl;
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std::cout << "--- Worklet accepting all types." << std::endl;
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vtkm::testing::Testing::TryTypes(map_whole_array::DoTestWholeArrayWorklet(),
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vtkm::TypeListCommon());
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}
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} // anonymous namespace
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int UnitTestWorkletMapFieldWholeArray(int argc, char* argv[])
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{
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return vtkm::cont::testing::Testing::RunOnDevice(
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map_whole_array::TestWorkletMapFieldExecArg, argc, argv);
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}
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