Game2.cs

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


namespace TheWall
{
	public class Game2 : Game
	{
		GraphicsDeviceManager _graphics;
		SpriteBatch _spriteBatch;
		Texture2D _moonTexture;
		RenderTarget2D _renderTarget;
		RenderTarget2D _renderTarget2;


		public Game2()
		{
			_graphics = new GraphicsDeviceManager( this );
			Content.RootDirectory = "Content";
			IsMouseVisible = true;
		}


		protected override void LoadContent()
		{
			_spriteBatch = new SpriteBatch( GraphicsDevice );
			_moonTexture = Content.Load<Texture2D>( "moon.png" );
		}


		protected override void Update( GameTime gameTime )
		{
			Input.update();
			if( Input.isKeyDown( Keys.A ) )
			{
				_renderTarget = new RenderTarget2D( _graphics.GraphicsDevice, 128, 128, false, SurfaceFormat.Color, DepthFormat.None, 0, RenderTargetUsage.PreserveContents );
				renderMoon( _renderTarget, Color.Red );
			}

			if( Input.isKeyDown( Keys.B ) )
			{
				_renderTarget2 = new RenderTarget2D( _graphics.GraphicsDevice, 128, 128, false, SurfaceFormat.Color, DepthFormat.None, 0, RenderTargetUsage.PreserveContents );
				renderMoon( _renderTarget2, Color.Blue );
			}

			base.Update( gameTime );
		}


		void renderMoon( RenderTarget2D target, Color color )
		{
			_graphics.GraphicsDevice.SetRenderTarget( target );
			_spriteBatch.Begin( SpriteSortMode.Immediate, BlendState.AlphaBlend );
			_spriteBatch.Draw( _moonTexture, Vector2.Zero, color );
			_spriteBatch.End();

			_graphics.GraphicsDevice.SetRenderTarget( null );
		}


		protected override void Draw( GameTime gameTime )
		{
			GraphicsDevice.Clear( Color.CornflowerBlue );

			_spriteBatch.Begin( SpriteSortMode.Immediate, BlendState.AlphaBlend );

			if( _renderTarget != null )
				_spriteBatch.Draw( _renderTarget, new Vector2( 150, 150 ), Color.White );

			if( _renderTarget2 != null )
				_spriteBatch.Draw( _renderTarget2, new Vector2( 0, 0 ), Color.White );

			_spriteBatch.End();

			base.Draw( gameTime );
		}
	}
}