133 lines
4.4 KiB
C++
133 lines
4.4 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_interop_TransferToOpenGL_h
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#define vtk_m_interop_TransferToOpenGL_h
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/DeviceAdapter.h>
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#include <vtkm/cont/ErrorBadValue.h>
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#include <vtkm/cont/TryExecute.h>
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#include <vtkm/interop/BufferState.h>
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#include <vtkm/interop/internal/TransferToOpenGL.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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namespace vtkm
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{
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namespace interop
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{
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namespace detail
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{
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template <typename ArrayT>
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struct PrepareForInteropFunctor
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{
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ArrayT& Array;
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PrepareForInteropFunctor(ArrayT& array)
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: Array(array)
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{
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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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using Traits = vtkm::cont::DeviceAdapterTraits<DeviceAdapterTag>;
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this->Array.PrepareForInput(DeviceAdapterTag());
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return this->Array.GetDeviceAdapterId() == Traits::GetId();
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}
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};
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}
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/// \brief Manages transferring an ArrayHandle to opengl .
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///
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/// \c TransferToOpenGL manages to transfer the contents of an ArrayHandle
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/// to OpenGL as efficiently as possible. Will use the given \p state to determine
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/// what buffer handle to use, and the type to bind the buffer handle too.
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/// If the type of buffer hasn't been determined the transfer will use
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/// deduceAndSetBufferType to do so. Lastly state also holds on to per backend resources
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/// that allow for efficient updating to open gl
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///
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/// This function keeps the buffer as the active buffer of the input type.
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///
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/// This function will throw exceptions if the transfer wasn't possible
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///
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template <typename ValueType, class StorageTag, class DeviceAdapterTag>
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VTKM_CONT void TransferToOpenGL(vtkm::cont::ArrayHandle<ValueType, StorageTag> handle,
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BufferState& state,
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DeviceAdapterTag)
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{
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vtkm::interop::internal::TransferToOpenGL<ValueType, DeviceAdapterTag> toGL(state);
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return toGL.Transfer(handle);
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}
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/// Dispatch overload for TransferToOpenGL that deduces the DeviceAdapter for
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/// the given ArrayHandle.
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///
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/// \overload
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///
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template <typename ValueType, class StorageTag>
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VTKM_CONT void TransferToOpenGL(vtkm::cont::ArrayHandle<ValueType, StorageTag> handle,
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BufferState& state)
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{
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vtkm::cont::DeviceAdapterId devId = handle.GetDeviceAdapterId();
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if (devId == VTKM_DEVICE_ADAPTER_UNDEFINED)
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{
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using ArrayT = vtkm::cont::ArrayHandle<ValueType, StorageTag>;
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using Functor = detail::PrepareForInteropFunctor<ArrayT>;
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// Undefined device means that the array is not in an execution environment.
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// In this case, call PrepareForInput using the devices in the tracker
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// to move the data onto a device. This is required for a CUDA usecase
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// where a device pointer is set as control memory to reuse an already
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// allocated buffer. PrepareForInput on CUDA will detect this and set the
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// execution pointer to match the control pointer.
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vtkm::cont::TryExecute(Functor(handle));
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devId = handle.GetDeviceAdapterId();
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}
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switch (devId)
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{
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case VTKM_DEVICE_ADAPTER_SERIAL:
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TransferToOpenGL(handle, state, vtkm::cont::DeviceAdapterTagSerial());
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break;
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#ifdef VTKM_ENABLE_TBB
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case VTKM_DEVICE_ADAPTER_TBB:
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TransferToOpenGL(handle, state, vtkm::cont::DeviceAdapterTagTBB());
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break;
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#endif
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#ifdef VTKM_CUDA
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case VTKM_DEVICE_ADAPTER_CUDA:
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TransferToOpenGL(handle, state, vtkm::cont::DeviceAdapterTagCuda());
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break;
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#endif
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default:
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throw vtkm::cont::ErrorBadValue("Unknown device id.");
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}
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}
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}
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}
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#endif //vtk_m_interop_TransferToOpenGL_h
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