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examples/sprites: Apply ColorM change only once

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This commit is contained in:
Hajime Hoshi 2017-05-28 01:02:54 +09:00
parent 3b3179e33e
commit e84b717c95
1 changed files with 11 additions and 13 deletions
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20
examples/sprites/main.go
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@ -33,8 +33,6 @@ const (
var ( var (
ebitenImage *ebiten.Image ebitenImage *ebiten.Image
ebitenImageWidth = 0
ebitenImageHeight = 0
) )
type Sprite struct { type Sprite struct {
@ -81,14 +79,10 @@ const (
MaxSprites = 50000 MaxSprites = 50000
) )
var sprites = &Sprites{make([]*Sprite, MaxSprites), 500} var (
sprites = &Sprites{make([]*Sprite, MaxSprites), 500}
var op *ebiten.DrawImageOptions
func init() {
op = &ebiten.DrawImageOptions{} op = &ebiten.DrawImageOptions{}
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5) )
}
func update(screen *ebiten.Image) error { func update(screen *ebiten.Image) error {
if ebiten.IsKeyPressed(ebiten.KeyLeft) { if ebiten.IsKeyPressed(ebiten.KeyLeft) {
@ -125,11 +119,15 @@ Press <- or -> to change the number of sprites`, ebiten.CurrentFPS(), sprites.nu
func main() { func main() {
var err error var err error
ebitenImage, _, err = ebitenutil.NewImageFromFile("_resources/images/ebiten.png", ebiten.FilterNearest) img, _, err := ebitenutil.NewImageFromFile("_resources/images/ebiten.png", ebiten.FilterNearest)
if err != nil { if err != nil {
log.Fatal(err) log.Fatal(err)
} }
ebitenImageWidth, ebitenImageHeight = ebitenImage.Size() w, h := img.Size()
ebitenImage, _ = ebiten.NewImage(w, h, ebiten.FilterNearest)
op := &ebiten.DrawImageOptions{}
op.ColorM.Scale(1, 1, 1, 0.5)
ebitenImage.DrawImage(img, op)
for i := range sprites.sprites { for i := range sprites.sprites {
w, h := ebitenImage.Size() w, h := ebitenImage.Size()
x, y := rand.Intn(screenWidth-w), rand.Intn(screenHeight-h) x, y := rand.Intn(screenWidth-w), rand.Intn(screenHeight-h)