namespace WindowsGame1
{
public class Game1 : Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager graphics;
SpriteBatch spriteBatch;

RenderTarget2D renderTarget2D;
Effect Shader;
Vector2[] position;
int time=0;

public Game1(){
graphics = new GraphicsDeviceManager(this);
graphics.IsFullScreen = true;
graphics.PreferredBackBufferHeight = 768;
graphics.PreferredBackBufferWidth = 1366;
Content.RootDirectory = "Content";}

protected override void Initialize(){
renderTarget2D = new RenderTarget2D(GraphicsDevice, graphics.PreferredBackBufferWidth, graphics.PreferredBackBufferHeight);
base.Initialize();
position = new Vector2[3];
}

protected override void LoadContent(){
spriteBatch = new SpriteBatch(GraphicsDevice);
Shader = Content.Load<Effect>("Interference");}

protected override void UnloadContent(){}

protected override void Update(GameTime gameTime){
if (Keyboard.GetState().IsKeyDown(Keys.Escape))
this.Exit();

time+=4;
position[0] = new Vector2((float)( 0.52 + 0.3 * Math.Sin(0.0005 * time)), (float)(0.5 + 0.45*Math.Cos(0.0007 * time)));
position[1] = new Vector2((float)( 0.6 + 0.3 * Math.Cos(0.0006 * time)), (float)(0.6 + 0.3 * Math.Sin(0.0003 * time)));
position[2] = new Vector2((float)( 0.3 + 0.2 * Math.Sin(0.0009 * time)), (float)(0.6 + 0.3 * Math.Cos(0.0015 * time)));

base.Update(gameTime);
}

/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Draw(GameTime gameTime)
{
Shader.Parameters["ratio"].SetValue(new Vector2(1.0f*graphics.PreferredBackBufferHeight/graphics.PreferredBackBufferWidth, 1));
Shader.Parameters["light"].SetValue(new Vector4(1f, 0.7f, 0, 1f));

//кuтайский код
Shader.Parameters["position0"].SetValue(position[0]);
Shader.Parameters["position1"].SetValue(position[1]);
Shader.Parameters["position2"].SetValue(position[2]);

GraphicsDevice.SetRenderTarget(renderTarget2D);
GraphicsDevice.Clear(Color.Black);

GraphicsDevice.SetRenderTarget(null);

spriteBatch.Begin(0,BlendState.AlphaBlend, null, null, null, Shader);
spriteBatch.Draw(renderTarget2D,Vector2.Zero,Color .White);
spriteBatch.End();

base.Draw(gameTime);
}
}
}

sampler ColorSampler : register(s0);

float2 ratio;
float4 light;

//китайский кодинг
float2 position0;
float2 position1;
float2 position2;

float Add(float2 dR)
{
return sin(length(dR/ratio)*50);
}

float4 terferencePS(float2 TexCoords : TEXCOORD0):COLOR0
{
float intens=Add(TexCoords-position0)
+Add(TexCoords-position1)
+Add(TexCoords-position2);
intens=abs(intens/3);
return light*intens+float4(0,0,0,1);
}

technique Interference
{
pass Pass1
{
PixelShader = compile ps_2_0 InterferencePS();
}
}