TransferToOpenGL.h

Go to the documentation of this file.

//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt for details.
//
//  This software is distributed WITHOUT ANY WARRANTY; without even
//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
//  PURPOSE.  See the above copyright notice for more information.
//============================================================================
#ifndef vtk_m_interop_TransferToOpenGL_h
#define vtk_m_interop_TransferToOpenGL_h
 
#include <vtkm/cont/ArrayHandle.h>
#include <vtkm/cont/DeviceAdapter.h>
#include <vtkm/cont/ErrorBadValue.h>
#include <vtkm/cont/TryExecute.h>
#include <vtkm/interop/BufferState.h>
#include <vtkm/interop/internal/TransferToOpenGL.h>
 
#include <vtkm/cont/cuda/DeviceAdapterCuda.h>
#include <vtkm/cont/serial/DeviceAdapterSerial.h>
#include <vtkm/cont/tbb/DeviceAdapterTBB.h>
 
namespace vtkm
{
namespace interop
{
 
template <typename ValueType, class StorageTag, class DeviceAdapterTag>
VTKM_CONT void TransferToOpenGL(const vtkm::cont::ArrayHandle<ValueType, StorageTag>& handle,
                                BufferState& state,
                                DeviceAdapterTag)
{
  vtkm::interop::internal::TransferToOpenGL<ValueType, DeviceAdapterTag> toGL(state);
  toGL.Transfer(handle);
}
 
template <typename ValueType, typename StorageTag>
VTKM_CONT void TransferToOpenGL(const vtkm::cont::ArrayHandle<ValueType, StorageTag>& handle,
                                BufferState& state)
{
  // First, try to transfer data that already exists on a device.
  bool success = vtkm::cont::TryExecute([&](auto device) {
    if (handle.IsOnDevice(device))
    {
      TransferToOpenGL(handle, state, device);
      return true;
    }
    else
    {
      return false;
    }
  });
  if (!success)
  {
    // Generally, we are here because the array is not already on a device
    // or for some reason the transfer failed on that device. Try any device.
    success = vtkm::cont::TryExecute([&](auto device) {
      TransferToOpenGL(handle, state, device);
      return true;
    });
  }
  if (!success)
  {
    throw vtkm::cont::ErrorBadValue("Failed to transfer array to OpenGL on any device.");
  }
}
}
}
 
#endif //vtk_m_interop_TransferToOpenGL_h