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<!DOCTYPE html>
< link rel = "shortcut icon" href = "../favicon.png" type = "image/png" >
< link rel = "icon" href = "../favicon.png" type = "image/png" >
< title > Ebiten example - noise< / title >
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< link rel = "stylesheet" href = "/stylesheets/bootstrap.min.css" >
< link rel = "stylesheet" href = "/stylesheets/ebiten.css" >
< header class = "navbar" > < div class = "container" >
< div class = "navbar-header" >
< a class = "navbar-brand" href = "/" > Ebiten< / a >
< / div >
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< nav class = "collapse navbar-collapse" >
< ul class = "nav navbar-nav navbar-right" >
< li > < a href = "https://github.com/hajimehoshi/ebiten" > GitHub< / a > < / li >
< li > < a href = "http://godoc.org/github.com/hajimehoshi/ebiten" > GoDoc< / a > < / li >
< li > < a href = "https://github.com/hajimehoshi/ebiten/wiki" > Wiki< / a >
< / ul >
< / 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 >
< pre > < code > // + build example
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package main
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import (
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" fmt"
" image"
" log"
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" github.com/hajimehoshi/ebiten"
" github.com/hajimehoshi/ebiten/ebitenutil"
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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 < < 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
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}
var randInstance = & rand{12345678, 4185243, 776511, 45411}
func update(screen *ebiten.Image) error {
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const l = screenWidth * screenHeight
for i := 0; i < l; i+ + {
x := randInstance.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 err := screen.ReplacePixels(noiseImage.Pix); err != nil {
return err
}
if err := ebitenutil.DebugPrint(screen, fmt.Sprintf(" FPS: %f" , ebiten.CurrentFPS())); err != nil {
return err
}
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, " Noise (Ebiten Demo)" ); err != nil {
log.Fatal(err)
}
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}
< / code > < / pre >
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< / 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" > 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 >
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