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examples/noise: Refactoring

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This commit is contained in:
Hajime Hoshi 2018-01-30 03:50:07 +09:00
parent 6e5830739f
commit 13974808a6
1 changed files with 5 additions and 2 deletions
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7
examples/noise/main.go
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@ -47,20 +47,23 @@ func (r *rand) next() uint32 {
return r.w return r.w
} }
var randInstance = &rand{12345678, 4185243, 776511, 45411} var theRand = &rand{12345678, 4185243, 776511, 45411}
func update(screen *ebiten.Image) error { func update(screen *ebiten.Image) error {
// Generate the noise with random RGB values.
const l = screenWidth * screenHeight const l = screenWidth * screenHeight
for i := 0; i < l; i++ { for i := 0; i < l; i++ {
x := randInstance.next() x := theRand.next()
noiseImage.Pix[4*i] = uint8(x >> 24) noiseImage.Pix[4*i] = uint8(x >> 24)
noiseImage.Pix[4*i+1] = uint8(x >> 16) noiseImage.Pix[4*i+1] = uint8(x >> 16)
noiseImage.Pix[4*i+2] = uint8(x >> 8) noiseImage.Pix[4*i+2] = uint8(x >> 8)
noiseImage.Pix[4*i+3] = 0xff noiseImage.Pix[4*i+3] = 0xff
} }
if ebiten.IsRunningSlowly() { if ebiten.IsRunningSlowly() {
return nil return nil
} }
screen.ReplacePixels(noiseImage.Pix) screen.ReplacePixels(noiseImage.Pix)
ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %f", ebiten.CurrentFPS())) ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %f", ebiten.CurrentFPS()))
return nil return nil