Retro2D : Minimal Code + FPS + Mouse

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Retro2D;

namespace StarterGame
{
    public class Game1 : Game
    {
        Window _window = new Window();
        FrameCounter _frameCounter = new FrameCounter();
        MouseState _mouseState;
        int _relMouseX;
        int _relMouseY;
        int _screenW = 960;
        int _screenH = 540;

        public int _finalScreenW = 960;
        public int _finalScreenH = 540;

        public Game1()
        {
            _window.Setup(this, Mode.RETRO, "StarterGame", _screenW, _screenH, 2, 0, false, true, false);
            Content.RootDirectory = "Content";
        }
        protected override void Initialize()
        {
            _window.Init();
            _window.SetScale(2);

            _window.SetFinalScreenSize(_finalScreenW, _finalScreenH);

            base.Initialize();
        }
        protected override void LoadContent()
        {
        }
        protected override void UnloadContent()
        {
        }
        protected override void Update(GameTime gameTime)
        {
            _window.GetMouse(ref _relMouseX, ref _relMouseY, ref _mouseState);

            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
                Exit();

            _window.UpdateStdWindowControl();

            _frameCounter.Update(gameTime);

            Window.Title = "FPS :" + _frameCounter.Fps();

            base.Update(gameTime);
        }
        protected override void Draw(GameTime gameTime)
        {

            // Set Target to MainRenderTarget !
            _window.SetRenderTarget(_window.NativeRenderTarget);
            _window.Batch.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied, SamplerState.PointClamp); //, DepthStencilState.None, RasterizerState.CullCounterClockwise );

            // Draw something here !
            _window.Batch.GraphicsDevice.Clear(new Color(20, 40, 60));
            Retro2D.Draw.Grid(_window.Batch, 0, 0, _screenW, _screenH, 16, 16, Color.Gray * .4f);
            Retro2D.Draw.Sight(_window.Batch, _relMouseX, _relMouseY, _screenW, _screenH, Color.RoyalBlue, 1);

            _window.Batch.End();

            // Render MainTarget in FinalTarget
            _window.SetRenderTarget(_window.FinalRenderTarget);
            _window.Batch.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied, SamplerState.AnisotropicClamp);

            _window.RenderMainTarget(Color.White);

            _window.Batch.End();

            // Flip to FinalRenderTarget !
            _window.SetRenderTarget(null);
            _window.Batch.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied, SamplerState.AnisotropicClamp);

            _window.RenderFinalTarget(Color.White);

            _window.Batch.End();


            base.Draw(gameTime);
        }
    }
}