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https://gitlab.kitware.com/vtk/vtk-m
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135 lines
4.6 KiB
C++
135 lines
4.6 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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#include <iostream>
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#include <vtkm/Math.h>
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/RuntimeDeviceInformation.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/TryExecute.h>
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#include <vtkm/cont/cuda/DeviceAdapterCuda.h>
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#include <vtkm/cont/serial/DeviceAdapterSerial.h>
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#include <vtkm/cont/tbb/DeviceAdapterTBB.h>
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typedef vtkm::Vec<vtkm::Float32, 3> FloatVec3;
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typedef vtkm::Vec<vtkm::UInt8, 4> Uint8Vec4;
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struct GenerateSurfaceWorklet : public vtkm::worklet::WorkletMapField
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{
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vtkm::Float32 t;
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GenerateSurfaceWorklet(vtkm::Float32 st)
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: t(st)
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{
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}
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typedef void ControlSignature(FieldIn<>, FieldOut<>, FieldOut<>);
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typedef void ExecutionSignature(_1, _2, _3);
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template <typename T>
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VTKM_EXEC void operator()(const vtkm::Vec<T, 3>& input,
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vtkm::Vec<T, 3>& output,
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vtkm::Vec<vtkm::UInt8, 4>& color) const
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{
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output[0] = input[0];
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output[1] = 0.25f * vtkm::Sin(input[0] * 10.f + t) * vtkm::Cos(input[2] * 10.f + t);
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output[2] = input[2];
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color[0] = 0;
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color[1] = static_cast<vtkm::UInt8>(160 + (96 * vtkm::Sin(input[0] * 10.f + t)));
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color[2] = static_cast<vtkm::UInt8>(160 + (96 * vtkm::Cos(input[2] * 5.f + t)));
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color[3] = 255;
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}
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};
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struct RunGenerateSurfaceWorklet
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{
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template <typename DeviceAdapterTag>
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bool operator()(DeviceAdapterTag) const
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{
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//At this point we know we have runtime support
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typedef vtkm::cont::DeviceAdapterTraits<DeviceAdapterTag> DeviceTraits;
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typedef vtkm::worklet::DispatcherMapField<GenerateSurfaceWorklet, DeviceAdapterTag>
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DispatcherType;
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std::cout << "Running a worklet on device adapter: " << DeviceTraits::GetName() << std::endl;
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GenerateSurfaceWorklet worklet(0.05f);
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DispatcherType(worklet).Invoke(this->In, this->Out, this->Color);
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return true;
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}
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vtkm::cont::ArrayHandle<FloatVec3> In;
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vtkm::cont::ArrayHandle<FloatVec3> Out;
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vtkm::cont::ArrayHandle<Uint8Vec4> Color;
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};
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template <typename T>
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std::vector<vtkm::Vec<T, 3>> make_testData(int size)
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{
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std::vector<vtkm::Vec<T, 3>> data;
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data.reserve(static_cast<std::size_t>(size * size));
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for (int i = 0; i < size; ++i)
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{
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for (int j = 0; j < size; ++j)
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{
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data.push_back(vtkm::Vec<T, 3>(
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2.f * static_cast<T>(i / size) - 1.f, 0.f, 2.f * static_cast<T>(j / size) - 1.f));
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}
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}
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return data;
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}
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//This is the list of devices to compile in support for. The order of the
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//devices determines the runtime preference.
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struct DevicesToTry : vtkm::ListTagBase<vtkm::cont::DeviceAdapterTagCuda,
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vtkm::cont::DeviceAdapterTagTBB,
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vtkm::cont::DeviceAdapterTagSerial>
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{
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};
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int main(int, char**)
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{
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std::vector<FloatVec3> data = make_testData<vtkm::Float32>(1024);
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//make array handles for the data
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// TryExecutes takes a functor and a list of devices. It then tries to run
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// the functor for each device (in the order given in the list) until the
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// execution succeeds. This allows you to compile in support for multiple
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// devices which have runtime requirements ( GPU / HW Accelerator ) and
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// correctly choose the best device at runtime.
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//
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// The functor parentheses operator should take exactly one argument, which is
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// the DeviceAdapterTag to use. The functor should return true if the execution
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// succeeds.
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//
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// This function also optionally takes a vtkm::cont::RuntimeDeviceTracker, which
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// will monitor for certain failures across calls to TryExecute and skip trying
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// devices with a history of failure.
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RunGenerateSurfaceWorklet task;
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task.In = vtkm::cont::make_ArrayHandle(data);
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vtkm::cont::TryExecute(task, DevicesToTry());
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}
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