started on virtual screen / viewport

MonoGame.Extended/Game1/Game1.cs

@@ -1,4 +1,5 @@
-using Microsoft.Xna.Framework;
+using System;
+using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
 using Microsoft.Xna.Framework.Input;
 using MonoGame.Extended;
@@ -13,16 +14,25 @@ namespace Game1
         private Texture2D[] _backgroundTexture;
         private Texture2D _backgroundTextureClouds;
         private Texture2D _backgroundTextureSky;
+        private VirtualScreen _virtualScreen;
 
         public Game1()
         {
             _graphicsDeviceManager = new GraphicsDeviceManager(this);
             Content.RootDirectory = "Content";
             IsMouseVisible = true;
+            Window.AllowUserResizing = true;
+            Window.ClientSizeChanged += WindowOnClientSizeChanged;
+        }
+
+        private void WindowOnClientSizeChanged(object sender, EventArgs eventArgs)
+        {
+            _virtualScreen.OnClientSizeChanged();
         }
 
         protected override void Initialize()
         {
+            _virtualScreen = new VirtualScreen(GraphicsDevice, 800, 480);
             _camera = new Camera2D(GraphicsDevice.Viewport);
             base.Initialize();
         }
@@ -108,7 +118,7 @@ namespace Game1
         {
             GraphicsDevice.Clear(Color.CornflowerBlue);
 
-            _spriteBatch.Begin(transformMatrix: _camera.GetViewMatrix(new Vector2(0.0f, 1.0f)));
+            _spriteBatch.Begin(transformMatrix: _camera.GetViewMatrix(new Vector2(0.0f, 1.0f)) * _virtualScreen.GetScaleMatrix());
             _spriteBatch.Draw(_backgroundTextureSky, Vector2.Zero);
             _spriteBatch.Draw(_backgroundTextureClouds, Vector2.Zero);
             _spriteBatch.End();
@@ -116,7 +126,7 @@ namespace Game1
             for (var i = 0; i < 4; i++)
             {
                 var parallaxFactor = new Vector2(0.5f + 0.25f * i, 1.0f);
-                var viewMatrix = _camera.GetViewMatrix(parallaxFactor);
+                var viewMatrix = _camera.GetViewMatrix(parallaxFactor) * _virtualScreen.GetScaleMatrix();
                 _spriteBatch.Begin(transformMatrix: viewMatrix);
                 _spriteBatch.Draw(_backgroundTexture[i], Vector2.Zero);
                 _spriteBatch.End();

MonoGame.Extended/MonoGame.Extended/MonoGame.Extended.csproj

@@ -38,6 +38,7 @@
     <Compile Include="SpriteBatchExtensions.cs" />
     <Compile Include="TextureRegion2D.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="VirtualScreen.cs" />
   </ItemGroup>
   <ItemGroup>
     <Reference Include="MonoGame.Framework, Version=3.1.2.0, Culture=neutral, processorArchitecture=MSIL">

MonoGame.Extended/MonoGame.Extended/VirtualScreen.cs

@@ -0,0 +1,46 @@
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace MonoGame.Extended
+{
+    public class VirtualScreen
+    {
+        private readonly GraphicsDevice _graphicsDevice;
+
+        public VirtualScreen(GraphicsDevice graphicsDevice, int virtualWidth, int virtualHeight)
+        {
+            _graphicsDevice = graphicsDevice;
+
+            VirtualWidth = virtualWidth;
+            VirtualHeight = virtualHeight;
+        }
+
+        public int VirtualWidth { get; private set; }
+        public int VirtualHeight { get; private set; }
+
+        public int ActualWidth
+        {
+            get { return _graphicsDevice.Viewport.Width; }
+        }
+
+        public int ActualHeight
+        {
+            get { return _graphicsDevice.Viewport.Height; }
+        }
+
+        public Matrix GetScaleMatrix()
+        {
+            var scaleX = (float) ActualWidth / VirtualWidth;
+            var scaleY = (float) ActualHeight / VirtualHeight;
+            return Matrix.CreateScale(scaleX, scaleY, 1.0f);
+        }
+
+        public void OnClientSizeChanged()
+        {
+            var aspectRatio = (float) VirtualWidth / VirtualHeight;
+            var newWidth = _graphicsDevice.Viewport.Width;
+            var newHeight = _graphicsDevice.Viewport.Height;
+            _graphicsDevice.Viewport = new Viewport(100, 100, 300, 300);
+        }
+    }
+}