/// <summary>
        /// Configures the Direct3D device, and stores handles to it and the device context.
        /// </summary>
        private void CreateDeviceResources()
        {
            DisposeDeviceAndContext();

            // This flag adds support for surfaces with a different color channel ordering
            // than the API default. It is required for compatibility with Direct2D.
            DeviceCreationFlags creationFlags = DeviceCreationFlags.BgraSupport;

#if DEBUG
            if (DirectXHelper.SdkLayersAvailable())
            {
                // If the project is in a debug build, enable debugging via SDK Layers with this flag.
                creationFlags |= DeviceCreationFlags.Debug;
            }
#endif

            // This array defines the set of DirectX hardware feature levels this app will support.
            // Note the ordering should be preserved.
            // Note that HoloLens supports feature level 11.1. The HoloLens emulator is also capable
            // of running on graphics cards starting with feature level 10.0.
            FeatureLevel[] featureLevels =
            {
                FeatureLevel.Level_12_1,
                FeatureLevel.Level_12_0,
                FeatureLevel.Level_11_1,
                FeatureLevel.Level_11_0,
                FeatureLevel.Level_10_1,
                FeatureLevel.Level_10_0
            };

            // Create the Direct3D 11 API device object and a corresponding context.
            try
            {
                if (null != dxgiAdapter)
                {
                    using (var device = new Device(dxgiAdapter, creationFlags, featureLevels))
                    {
                        // Store pointers to the Direct3D 11.1 API device.
                        d3dDevice = ToDispose(device.QueryInterface <Device3>());
                    }
                }
                else
                {
                    using (var device = new Device(DriverType.Hardware, creationFlags, featureLevels))
                    {
                        // Store a pointer to the Direct3D device.
                        d3dDevice = ToDispose(device.QueryInterface <Device3>());
                    }
                }
            }
            catch
            {
                // If the initialization fails, fall back to the WARP device.
                // For more information on WARP, see:
                // http://go.microsoft.com/fwlink/?LinkId=286690
                using (var device = new Device(DriverType.Warp, creationFlags, featureLevels))
                {
                    d3dDevice = ToDispose(device.QueryInterface <Device3>());
                }
            }

            // Cache the feature level of the device that was created.
            d3dFeatureLevel = d3dDevice.FeatureLevel;

            // Store a pointer to the Direct3D immediate context.
            d3dContext = ToDispose(d3dDevice.ImmediateContext3);

            // Acquire the DXGI interface for the Direct3D device.
            using (var dxgiDevice = d3dDevice.QueryInterface <SharpDX.DXGI.Device3>())
            {
                // Wrap the native device using a WinRT interop object.
                IntPtr pUnknown;
                uint   hr = InteropStatics.CreateDirect3D11DeviceFromDXGIDevice(dxgiDevice.NativePointer, out pUnknown);
                if (hr == 0)
                {
                    d3dInteropDevice = (IDirect3DDevice)Marshal.GetObjectForIUnknown(pUnknown);
                    Marshal.Release(pUnknown);
                }

                // Store a pointer to the DXGI adapter.
                // This is for the case of no preferred DXGI adapter, or fallback to WARP.
                dxgiAdapter = ToDispose(dxgiDevice.Adapter.QueryInterface <SharpDX.DXGI.Adapter3>());
            }

            // Check for device support for the optional feature that allows setting the render target array index from the vertex shader stage.
            var options = d3dDevice.CheckD3D113Features3();
            if (options.VPAndRTArrayIndexFromAnyShaderFeedingRasterizer)
            {
                d3dDeviceSupportsVprt = true;
            }
        }