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// You don't need all of the crud the new project wizard barfs out.

using Windows.ApplicationModel.Activation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace MyThing
{
    sealed partial class App : Application
    {

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/**
    App.cpp
*/

#include "pch.h"

#include <agile.h>
#include <dxgi1_4.h>
#include <d3d11_3.h>
#include <DirectXMath.h>

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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()
{

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// Code to implement decently performing FFT for complex and real valued
// signals. See www.lomont.org for a derivation of the relevant algorithms 
// from first principles. Copyright Chris Lomont 2010-2012.
// This code and any ports are free for all to use for any reason as long 
// as this header is left in place.
// Version 1.1, Sept 2011
using System;

/* History:
 * Sep 2011 - v1.1 - added parameters to support various sign conventions 

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    public class ExampleBrush : XamlCompositionBrushBase
    {
        protected override void OnConnected()
        {
            if (CompositionBrush == null)
            {
                var compositor = Window.Current.Compositor;

                var bitmapUri = new System.Uri("ms-appx:///Assets/StoreLogo.png");
                var bitmapSurface = LoadedImageSurface.StartLoadFromUri(bitmapUri);

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using Microsoft.Graphics.Canvas;
using Microsoft.Graphics.Canvas.UI.Composition;
using System;
using Windows.Graphics.DirectX;
using Windows.UI.Composition;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Media;

namespace PixelImage
{

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/**
    D3D11AppView.cpp
*/

#include "pch.h"
#include "D3D11AppView.h"

using namespace Windows::ApplicationModel;
using namespace Windows::ApplicationModel::Core;
using namespace Windows::ApplicationModel::Activation;

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/**
    D3D11AppView.cpp
*/

#include "pch.h"
#include "D3D11AppView.h"

using namespace Windows::ApplicationModel;
using namespace Windows::ApplicationModel::Core;
using namespace Windows::ApplicationModel::Activation;

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Configuring a C++/WinRT project in Visual Studio.

1. Select Tools|Nuget Package Manager|Manage Nuget Packages for Solution...
2. Select Browse, search for cppwinrt and install for the project.
3. Right click the project, and select Properties.
4. Select All Configurations and All Platforms.
5. Select C/C++, Command Line.
6. Add /await /std:c++latest command line switches.
7. Select C/C++, All Options.
8. Set Consume Windows Runtime Extension to No.

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        /// <summary>
        /// In general the three letter code is just the first three letters of
        /// the name. Where this would result in a duplicate (e.g. New Orleans,
        /// New York) or otherwise be unclear some reasonable mnemonic is chosen.
        /// </summary>
        private Dictionary<string, string> cities = new Dictionary<string, string>
        {
            { "ALB", "Albuquerque" },
            { "ANC", "Anchorage" },
            { "ATL", "Atlanta" },