UWP CompositionBrush containing a tiling noise texture, host backdrop

Acrylic.cs

var compositor = Window.Current.Compositor;

var noiseUri = new System.Uri("ms-appx:///Assets/noisy-texture-256x256.png");
var noiseSurface = LoadedImageSurface.StartLoadFromUri(noiseUri);
var noiseBrush = compositor.CreateSurfaceBrush();
noiseBrush.Surface = noiseSurface;
noiseBrush.Stretch = CompositionStretch.None;

var composeNoiseAndBackgroundEffectDesc = new ArithmeticCompositeEffect()
{
    Source1 = new CompositionEffectSourceParameter("HostBackdropBrush"),
    Source2 = new GaussianBlurEffect()
    {
        Name = "Glass",
        BlurAmount = 12,
        BorderMode = EffectBorderMode.Soft,
        Source = new BorderEffect()
        {
            Name = "TiledNoise",
            ExtendX = CanvasEdgeBehavior.Wrap,
            ExtendY = CanvasEdgeBehavior.Wrap,
            Source = new CompositionEffectSourceParameter("NoiseBrush")
        }
    },
    Source1Amount = 0.8f,
    Source2Amount = 0.2f,
    MultiplyAmount = 0.0f,
    Offset = 0.0f
};
var composeNoiseAndBackgroundEffectFactory = compositor.CreateEffectFactory(composeNoiseAndBackgroundEffectDesc);
var composeNoiseAndBackgroundBrush = composeNoiseAndBackgroundEffectFactory.CreateBrush();
composeNoiseAndBackgroundBrush.SetSourceParameter("HostBackdropBrush", compositor.CreateHostBackdropBrush());
composeNoiseAndBackgroundBrush.SetSourceParameter("NoiseBrush", noiseBrush);

CompositionBrush = composeNoiseAndBackgroundBrush;