ebiten/docs/examples/noise.html

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<!DOCTYPE html>
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<meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/noise.png">
<meta name="description" content="Ebiten example - noise">
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<title>Ebiten example - noise</title>
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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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<div class="card"><pre class="card-body"><code class="language-go">// &#43;build example
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package main
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import (
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&#34;fmt&#34;
&#34;image&#34;
&#34;log&#34;
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&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
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)
const (
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screenWidth = 320
screenHeight = 240
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)
var (
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noiseImage *image.RGBA
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)
type rand struct {
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x, y, z, w uint32
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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.
// Use Xorshift instead: http://en.wikipedia.org/wiki/Xorshift
t := r.x ^ (r.x &lt;&lt; 11)
r.x, r.y, r.z = r.y, r.z, r.w
r.w = (r.w ^ (r.w &gt;&gt; 19)) ^ (t ^ (t &gt;&gt; 8))
return r.w
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}
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var theRand = &amp;rand{12345678, 4185243, 776511, 45411}
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func update(screen *ebiten.Image) error {
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// Generate the noise with random RGB values.
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const l = screenWidth * screenHeight
for i := 0; i &lt; l; i&#43;&#43; {
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x := theRand.next()
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noiseImage.Pix[4*i] = uint8(x &gt;&gt; 24)
noiseImage.Pix[4*i&#43;1] = uint8(x &gt;&gt; 16)
noiseImage.Pix[4*i&#43;2] = uint8(x &gt;&gt; 8)
noiseImage.Pix[4*i&#43;3] = 0xff
}
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if ebiten.IsRunningSlowly() {
return nil
}
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screen.ReplacePixels(noiseImage.Pix)
ebitenutil.DebugPrint(screen, fmt.Sprintf(&#34;FPS: %f&#34;, ebiten.CurrentFPS()))
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return nil
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}
func main() {
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noiseImage = image.NewRGBA(image.Rect(0, 0, screenWidth, screenHeight))
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Noise (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
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}
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</code></pre></div>
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<p>© 2013 Hajime Hoshi</p>
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