4xMSAA(Multi Sampling Anti Aliasing)

Let's use multisample anti-aliasing(MSAA).

The code hooked in a PreparingDeviceSetting event is added to the constructor of a Game1 class.

    graphics.PreparingDeviceSettings += new EventHandler<PreparingDeviceSettingsEventArgs>(GraphicsPreparingDeviceSettings);

And the following codes are added.

void GraphicsPreparingDeviceSettings(object sender, PreparingDeviceSettingsEventArgs e)
{
    PresentationParameters pp = e.GraphicsDeviceInformation.PresentationParameters;
#if XBOX
    pp.MultiSampleQuality = 1;
    pp.MultiSampleType = MultiSampleType.FourSamples;
    return;
#endif
    GraphicsAdapter adapter = e.GraphicsDeviceInformation.Adapter;
    SurfaceFormat format = adapter.CurrentDisplayMode.Format;

    int quality = 0;
    if (adapter.CheckDeviceMultiSampleType(DeviceType.Hardware, format, false, MultiSampleType.FourSamples, out quality))
    {
        pp.MultiSampleQuality = 0;
        pp.MultiSampleType = MultiSampleType.FourSamples;
    }
    else if (adapter.CheckDeviceMultiSampleType(DeviceType.Hardware, format, false, MultiSampleType.TwoSamples, out quality))
    {
        pp.MultiSampleQuality = 0;
        pp.MultiSampleType = MultiSampleType.TwoSamples;
    }
}

Reference
Higeneko diary