private void EnsureDevicePresent()
{
if (mDevice != null)
{
return;
}
DiagnosticsWriter.WriteInformation("Connecting to computation device");
var flags = mIsDebugModeEnabled
? DeviceCreationFlags.Debug
: DeviceCreationFlags.None;
if (flags.HasFlag(DeviceCreationFlags.Debug))
{
DiagnosticsWriter.WriteWarning("Computations are being run in debug mode. Performance will degrade.");
}
var adapterCount = mFactory.GetAdapterCount();
var error = (Exception)null;
for (var i = 0; i < adapterCount; i++)
{
var adapter = mFactory.GetAdapter(i);
var featureLevel = Device.GetSupportedFeatureLevel(adapter);
if (featureLevel < FeatureLevel.Level_11_0)
{
DiagnosticsWriter.WriteDebug("Skipping \"{0}\" because of an insufficient feature level ({1} < {2})",
adapter.Description.Description,
featureLevel.ToString(),
nameof(FeatureLevel.Level_11_0));
continue;
}
try
{
mDevice = new Device(adapter, flags, FeatureLevel.Level_11_0);
DiagnosticsWriter.WriteInformation("Connection to device established: {0}", adapter.Description.Description);
}
catch (Exception ex)
{
error = ex;
continue;
}
break;
}
if (mDevice == null)
{
if (error != null)
{
throw new Exception(string.Format(error.Message, error));
}
throw new NotSupportedException("No suitable adapter could be found.");
}
}