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    <p>This method doesn't use pixel shaders, but if you're looking to use Texture2D's SetData method instead of making a call to SpriteBatch.Draw() for every pixel, you may find this useful. I used an array of uint instead of bool to represent your colors. If you can get away with an 8-bit color texture, you could may be able to speed this up by changing the texture format.</p> <pre><code>public class Game1 : Microsoft.Xna.Framework.Game { // Set width, height const int WIDTH = 800; const int HEIGHT = 600; // Used to randomly fill in initial data, not necessary Random rand; // Graphics and spritebatch GraphicsDeviceManager graphics; SpriteBatch spriteBatch; // Texture you will regenerate each call to update Texture2D texture; // Data array you perform calculations on uint[] data; // Colors are represented in the texture as 0xAARRGGBB where: // AA = alpha // RR = red // GG = green // BB = blue // Set the first color to red const uint COLOR0 = 0xFFFF0000; // Set the second color to blue const uint COLOR1 = 0xFF0000FF; public Game1() { graphics = new GraphicsDeviceManager(this); Content.RootDirectory = "Content"; // Set width, height graphics.PreferredBackBufferWidth = WIDTH; graphics.PreferredBackBufferHeight = HEIGHT; } protected override void Initialize() { base.Initialize(); // Seed random, initialize array with random picks of the 2 colors rand = new Random((int)DateTime.Now.Ticks); data = new uint[WIDTH * HEIGHT]; loadInitialData(); } protected override void LoadContent() { // Create a new SpriteBatch, which can be used to draw textures. spriteBatch = new SpriteBatch(GraphicsDevice); // Create a new texture texture = new Texture2D(GraphicsDevice, WIDTH, HEIGHT); } protected override void Update(GameTime gameTime) { // Allows the game to exit if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed) this.Exit(); // Run-time error without this // Complains you can't modify a texture that has been set on the device GraphicsDevice.Textures[0] = null; // Do the calculations updateData(); // Update the texture for the next time it is drawn to the screen texture.SetData(data); base.Update(gameTime); } protected override void Draw(GameTime gameTime) { // Draw the texture once spriteBatch.Begin(); spriteBatch.Draw(texture, Vector2.Zero, Color.Purple); spriteBatch.End(); base.Draw(gameTime); } private void loadInitialData() { // Don't know where the initial data comes from // Just populate the array with a random selection of the two colors for (int i = 0; i &lt; WIDTH; i++) for (int j = 0; j &lt; HEIGHT; j++) data[i * HEIGHT + j] = rand.Next(2) == 0 ? COLOR0 : COLOR1; } private void updateData() { // Rough approximation of calculations for(int y = HEIGHT - 1; y &gt;= 0; y--) for (int x = WIDTH - 1; x &gt;= 0; x--) if (data[x * HEIGHT + y] == COLOR1) if (y + 1 &lt; HEIGHT &amp;&amp; data[x * HEIGHT + (y + 1)] == COLOR0) { data[x * HEIGHT + (y + 1)] = data[x * HEIGHT + y]; data[x * HEIGHT + y] = COLOR0; } } } </code></pre>
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    1. POHow can I use a Shader in XNA to color single pixels?
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    1. USVenesectrix
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    1. POHow can I use a Shader in XNA to color single pixels?
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    1. COCould not agree more. To make GPU stuff work fast, the way to go is to let the CPU upload your data as a texture. Using an indexed color texture is probably the fastest scenario, but 32 bit colors will probably perform just fine. Shaders are fun to write but they probably don't add value in this scenario.
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    2. COOut of interest... How would you know that the texture to remove from the device is at index [0]?
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    3. COI think because it's such a simple example and only one texture is being drawn that you can assume it's going to be at index 0. If the example had more than one texture, then I guess I would assume that they are in the graphics device in the order they are drawn, but I haven't found a source to back that up, sorry.
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