<!DOCTYPE html> <meta charset="utf-8"> <meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/noise.png"> <meta name="description" content="Ebiten example - noise"> <link rel="shortcut icon" href="../favicon.png" type="image/png" > <link rel="icon" href="../favicon.png" type="image/png" > <title>Ebiten example - noise</title> <link rel="stylesheet" href="../stylesheets/bootstrap.min.css"> <link rel="stylesheet" href="../stylesheets/highlight-github.css"> <link rel="stylesheet" href="../stylesheets/ebiten.css"> <script src="../scripts/googleanalytics.js"></script> <nav class="navbar"><div class="container"> <nav class="d-flex flex-row" style="width: 100%;"> <div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div> <ul class="nav"> <li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li> <li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li> <li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a> <li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</a> </ul> </nav> </div></nav> <main><div class="container"> <h2>Ebiten example - noise</h2> <iframe src="noise.content.html" width="640" height="480"></iframe> <div class="card"><pre class="card-body"><code class="language-go">// +build example package main import ( "fmt" "image" "log" "github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten/ebitenutil" ) const ( screenWidth = 320 screenHeight = 240 ) var ( noiseImage *image.RGBA ) type rand struct { x, y, z, w uint32 } func (r *rand) next() uint32 { // math/rand is too slow to keep 60 FPS on web browsers. // Use Xorshift instead: http://en.wikipedia.org/wiki/Xorshift t := r.x ^ (r.x << 11) r.x, r.y, r.z = r.y, r.z, r.w r.w = (r.w ^ (r.w >> 19)) ^ (t ^ (t >> 8)) return r.w } var theRand = &rand{12345678, 4185243, 776511, 45411} func update(screen *ebiten.Image) error { // Generate the noise with random RGB values. const l = screenWidth * screenHeight for i := 0; i < l; i++ { x := theRand.next() noiseImage.Pix[4*i] = uint8(x >> 24) noiseImage.Pix[4*i+1] = uint8(x >> 16) noiseImage.Pix[4*i+2] = uint8(x >> 8) noiseImage.Pix[4*i+3] = 0xff } if ebiten.IsRunningSlowly() { return nil } screen.ReplacePixels(noiseImage.Pix) ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %f", ebiten.CurrentFPS())) return nil } func main() { noiseImage = image.NewRGBA(image.Rect(0, 0, screenWidth, screenHeight)) if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Noise (Ebiten Demo)"); err != nil { log.Fatal(err) } } </code></pre></div> </div></main> <footer><div class="container"> <p>© 2013 Hajime Hoshi</p> <p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p> <p>The content of this page is licensed under <a href="https://creativecommons.org/licenses/by/4.0/">the Creative Commons Attribution 4.0 License</a>.</p> </div></footer> <script src="../scripts/highlight.pack.js"></script> <script>hljs.initHighlightingOnLoad();</script>