mirror of
https://github.com/hajimehoshi/ebiten.git
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101 lines
3.3 KiB
HTML
101 lines
3.3 KiB
HTML
<!DOCTYPE html>
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<script src="../scripts/force-https.js"></script>
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
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<link rel="icon" href="../favicon.png" type="image/png" >
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<title>Ebiten example - noise</title>
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<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">
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<link rel="stylesheet" href="../stylesheets/highlight-github.css">
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<link rel="stylesheet" href="../stylesheets/ebiten.css">
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<script src="../scripts/googleanalytics.js"></script>
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<header class="navbar"><div class="container">
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<div class="navbar-header">
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<a class="navbar-brand" href="..">Ebiten</a>
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</div>
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<nav class="collapse navbar-collapse">
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<ul class="nav navbar-nav navbar-right">
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<li><a href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
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<li><a href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>
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<li><a href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>
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</ul>
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</nav>
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</header>
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<main><div class="container">
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<h2>Ebiten example - noise</h2>
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<iframe src="noise.content.html" width="640" height="480"></iframe>
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<pre><code class="language-go">// +build example
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package main
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import (
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"fmt"
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"image"
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"log"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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noiseImage *image.RGBA
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)
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type rand struct {
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x, y, z, w uint32
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}
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func (r *rand) next() uint32 {
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// math/rand is too slow to keep 60 FPS on web browsers.
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// Use Xorshift instead: http://en.wikipedia.org/wiki/Xorshift
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t := r.x ^ (r.x << 11)
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r.x, r.y, r.z = r.y, r.z, r.w
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r.w = (r.w ^ (r.w >> 19)) ^ (t ^ (t >> 8))
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return r.w
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}
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var randInstance = &rand{12345678, 4185243, 776511, 45411}
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func update(screen *ebiten.Image) error {
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const l = screenWidth * screenHeight
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for i := 0; i < l; i++ {
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x := randInstance.next()
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noiseImage.Pix[4*i] = uint8(x >> 24)
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noiseImage.Pix[4*i+1] = uint8(x >> 16)
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noiseImage.Pix[4*i+2] = uint8(x >> 8)
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noiseImage.Pix[4*i+3] = 0xff
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}
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if err := screen.ReplacePixels(noiseImage.Pix); err != nil {
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return err
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}
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if err := ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %f", ebiten.CurrentFPS())); err != nil {
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return err
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}
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return nil
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}
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func main() {
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noiseImage = image.NewRGBA(image.Rect(0, 0, screenWidth, screenHeight))
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Noise (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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</code></pre>
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</div></main>
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<footer><div class="container">
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<p>© 2013 Hajime Hoshi</p>
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<p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p>
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<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>
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</div></footer>
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<script src="../scripts/highlight.pack.js"></script>
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<script>hljs.initHighlightingOnLoad();</script>
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