examples: Use RunGame

Updates #1111

examples/contextlost/main.go

@@ -39,14 +39,17 @@ const (
 )
 
 var (
-	count        = 0
 	gophersImage *ebiten.Image
 	extraImages  []*ebiten.Image
-	lost         = false
 )
 
-func loseAndRestoreContext(context js.Value) {
+type Game struct {
-	if lost {
+	count int
+	lost  bool
+}
+
+func (g *Game) loseAndRestoreContext(context js.Value) {
+	if g.lost {
 		return
 	}
 
@@ -61,7 +64,7 @@ func loseAndRestoreContext(context js.Value) {
 	ext.Call("loseContext")
 	fmt.Println("Lost the context!")
 	fmt.Println("The context is automatically restored after 3 seconds.")
-	lost = true
+	g.lost = true
 
 	// If and only if the context is lost by loseContext, you need to call restoreContext. Note that in usual
 	// case of context lost, you cannot call restoreContext but the context should be restored automatically.
@@ -71,11 +74,11 @@ func loseAndRestoreContext(context js.Value) {
 		time.Sleep(3 * time.Second)
 		ext.Call("restoreContext")
 		fmt.Println("Restored the context!")
-		lost = false
+		g.lost = false
 	}()
 }
 
-func update(screen *ebiten.Image) error {
+func (g *Game) Update(screen *ebiten.Image) error {
 	if inpututil.IsKeyJustPressed(ebiten.KeySpace) {
 		doc := js.Global().Get("document")
 		canvas := doc.Call("getElementsByTagName", "canvas").Index(0)
@@ -86,26 +89,29 @@ func update(screen *ebiten.Image) error {
 				context = canvas.Call("getContext", "experimental-webgl")
 			}
 		}
-		loseAndRestoreContext(context)
+		g.loseAndRestoreContext(context)
 		return nil
 	}
 
-	count++
+	g.count++
-	if ebiten.IsDrawingSkipped() {
 	return nil
 }
+
+func (g *Game) Draw(screen *ebiten.Image) {
 	w, h := gophersImage.Size()
 	op := &ebiten.DrawImageOptions{}
 
 	// For the details, see examples/rotate.
 	op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
-	op.GeoM.Rotate(float64(count%360) * 2 * math.Pi / 360)
+	op.GeoM.Rotate(float64(g.count%360) * 2 * math.Pi / 360)
 	op.GeoM.Translate(screenWidth/2, screenHeight/2)
 	screen.DrawImage(gophersImage, op)
 
 	ebitenutil.DebugPrint(screen, "Press Space to force to lose/restore the GL context!\n(Browser only)")
+}
 
-	return nil
+func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return screenWidth, screenHeight
 }
 
 func main() {
@@ -130,7 +136,9 @@ func main() {
 		extraImages = append(extraImages, eimg)
 	}
 
-	if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Context Lost (Ebiten Demo)"); err != nil {
+	ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
+	ebiten.SetWindowTitle("Context Lost (Ebiten Demo)")
+	if err := ebiten.RunGame(&Game{}); err != nil {
 		log.Fatal(err)
 	}
 }

examples/doomfire/main.go

@@ -33,7 +33,6 @@ const (
 
 var (
 	pixels      = make([]byte, screenSize*4)
-	firePixels  = make([]byte, screenSize)
 	firePalette = []color.RGBA{
 		{R: 7, G: 7, B: 7, A: 255},       //  0
 		{R: 31, G: 7, B: 7, A: 255},      //  1
@@ -75,29 +74,37 @@ var (
 	}
 )
 
-func init() {
+type Game struct {
+	firePixels []byte
+}
+
+func NewGame() *Game {
+	firePixels := make([]byte, screenSize)
 	for i := screenSize - screenWidth; i < screenSize; i++ {
 		firePixels[i] = 36
 	}
+	return &Game{
+		firePixels: firePixels,
+	}
 }
 
-func updateFirePixels() {
+func (g *Game) updateFirePixels() {
 	for i := 0; i < screenWidth; i++ {
 		for j := 0; j < screenHeight; j++ {
 			idx := i + (screenWidth * j)
-			updateFireIntensityPerPixel(idx)
+			g.updateFireIntensityPerPixel(idx)
 		}
 	}
 }
 
-func updateFireIntensityPerPixel(currentPixelIndex int) {
+func (g *Game) updateFireIntensityPerPixel(currentPixelIndex int) {
 	below := currentPixelIndex + screenWidth
 	if below >= screenSize {
 		return
 	}
 
 	d := rand.Intn(3)
-	newI := int(firePixels[below]) - d
+	newI := int(g.firePixels[below]) - d
 	if newI < 0 {
 		newI = 0
 	}
@@ -105,11 +112,11 @@ func updateFireIntensityPerPixel(currentPixelIndex int) {
 	if currentPixelIndex-d < 0 {
 		return
 	}
-	firePixels[currentPixelIndex-d] = byte(newI)
+	g.firePixels[currentPixelIndex-d] = byte(newI)
 }
 
-func renderFire() {
+func (g *Game) renderFire() {
-	for i, v := range firePixels {
+	for i, v := range g.firePixels {
 		p := firePalette[v]
 		pixels[i*4] = p.R
 		pixels[i*4+1] = p.G
@@ -118,22 +125,26 @@ func renderFire() {
 	}
 }
 
-func update(screen *ebiten.Image) error {
+func (g *Game) Update(screen *ebiten.Image) error {
-	updateFirePixels()
+	g.updateFirePixels()
-
-	if ebiten.IsDrawingSkipped() {
 	return nil
 }
 
-	renderFire()
+func (g *Game) Draw(screen *ebiten.Image) {
+	g.renderFire()
 	screen.ReplacePixels(pixels)
-	return nil
+}
+
+func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return screenWidth, screenHeight
 }
 
 func main() {
 	rand.Seed(time.Now().UnixNano())
 
-	if err := ebiten.Run(update, screenWidth, screenHeight, 6, "Doom Fire (Ebiten Demo)"); err != nil {
+	ebiten.SetWindowSize(screenWidth*6, screenHeight*6)
+	ebiten.SetWindowTitle("Doom Fire (Ebiten Demo)")
+	if err := ebiten.RunGame(NewGame()); err != nil {
 		log.Fatal(err)
 	}
 }

examples/drag/main.go

@@ -187,7 +187,7 @@ type Game struct {
 	sprites []*Sprite
 }
 
-var theGame *Game
+var ebitenImage *ebiten.Image
 
 func init() {
 	// Decode image from a byte slice instead of a file so that
@@ -203,8 +203,10 @@ func init() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	ebitenImage, _ := ebiten.NewImageFromImage(img, ebiten.FilterDefault)
+	ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
+}
 
+func NewGame() *Game {
 	// Initialize the sprites.
 	sprites := []*Sprite{}
 	w, h := ebitenImage.Size()
@@ -218,7 +220,7 @@ func init() {
 	}
 
 	// Initialize the game.
-	theGame = &Game{
+	return &Game{
 		strokes: map[*Stroke]struct{}{},
 		sprites: sprites,
 	}
@@ -264,7 +266,7 @@ func (g *Game) updateStroke(stroke *Stroke) {
 	stroke.SetDraggingObject(nil)
 }
 
-func (g *Game) update(screen *ebiten.Image) error {
+func (g *Game) Update(screen *ebiten.Image) error {
 	if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
 		s := NewStroke(&MouseStrokeSource{})
 		s.SetDraggingObject(g.spriteAt(s.Position()))
@@ -282,11 +284,10 @@ func (g *Game) update(screen *ebiten.Image) error {
 			delete(g.strokes, s)
 		}
 	}
-
-	if ebiten.IsDrawingSkipped() {
 	return nil
 }
 
+func (g *Game) Draw(screen *ebiten.Image) {
 	draggingSprites := map[*Sprite]struct{}{}
 	for s := range g.strokes {
 		if sprite := s.DraggingObject().(*Sprite); sprite != nil {
@@ -308,12 +309,16 @@ func (g *Game) update(screen *ebiten.Image) error {
 	}
 
 	ebitenutil.DebugPrint(screen, "Drag & Drop the sprites!")
+}
 
-	return nil
+func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return screenWidth, screenHeight
 }
 
 func main() {
-	if err := ebiten.Run(theGame.update, screenWidth, screenHeight, 2, "Drag & Drop (Ebiten Demo)"); err != nil {
+	ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
+	ebiten.SetWindowTitle("Drag & Drop (Ebiten Demo)")
+	if err := ebiten.RunGame(NewGame()); err != nil {
 		log.Fatal(err)
 	}
 }

examples/filter/main.go

@@ -36,11 +36,14 @@ var (
 	ebitenImage *ebiten.Image
 )
 
-func update(screen *ebiten.Image) error {
+type Game struct {
-	if ebiten.IsDrawingSkipped() {
+}
+
+func (g *Game) Update(screen *ebiten.Image) error {
 	return nil
 }
 
+func (g *Game) Draw(screen *ebiten.Image) {
 	ebitenutil.DebugPrint(screen, "Nearest Filter (default) VS Linear Filter")
 
 	op := &ebiten.DrawImageOptions{}
@@ -55,8 +58,10 @@ func update(screen *ebiten.Image) error {
 	// Specify linear filter.
 	op.Filter = ebiten.FilterLinear
 	screen.DrawImage(ebitenImage, op)
+}
 
-	return nil
+func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return screenWidth, screenHeight
 }
 
 func main() {
@@ -79,7 +84,9 @@ func main() {
 	// Specify FilterDefault here, that means to prefer filter specified at DrawImageOptions.
 	ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
 
-	if err := ebiten.Run(update, screenWidth, screenHeight, 1, "Filter (Ebiten Demo)"); err != nil {
+	ebiten.SetWindowSize(screenWidth, screenHeight)
+	ebiten.SetWindowTitle("Filter (Ebiten Demo)")
+	if err := ebiten.RunGame(&Game{}); err != nil {
 		log.Fatal(err)
 	}
 }

examples/flood/main.go

@@ -46,11 +46,14 @@ var (
 	}
 )
 
-func update(screen *ebiten.Image) error {
+type Game struct {
-	if ebiten.IsDrawingSkipped() {
+}
+
+func (g *Game) Update(screen *ebiten.Image) error {
 	return nil
 }
 
+func (g *Game) Draw(screen *ebiten.Image) {
 	const (
 		ox = 10
 		oy = 10
@@ -80,7 +83,10 @@ func update(screen *ebiten.Image) error {
 		op.ColorM.Translate(r, g, b, 0)
 		screen.DrawImage(ebitenImage, op)
 	}
-	return nil
+}
+
+func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return screenWidth, screenHeight
 }
 
 func main() {
@@ -99,7 +105,9 @@ func main() {
 	}
 	ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
 
-	if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Flood fill with solid colors (Ebiten Demo)"); err != nil {
+	ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
+	ebiten.SetWindowTitle("Flood fill with solid colors (Ebiten Demo)")
+	if err := ebiten.RunGame(&Game{}); err != nil {
 		log.Fatal(err)
 	}
 }

examples/font/main.go

@@ -41,11 +41,7 @@ var (
 	sampleText      = `The quick brown fox jumps over the lazy dog.`
 	mplusNormalFont font.Face
 	mplusBigFont    font.Face
-	counter         = 0
-	kanjiText       = []rune{}
-	kanjiTextColor  color.RGBA
 )
-
 var jaKanjis = []rune{}
 
 func init() {
@@ -115,28 +111,33 @@ func init() {
 	rand.Seed(time.Now().UnixNano())
 }
 
-func update(screen *ebiten.Image) error {
+type Game struct {
+	counter        int
+	kanjiText      []rune
+	kanjiTextColor color.RGBA
+}
+
+func (g *Game) Update(screen *ebiten.Image) error {
 	// Change the text color for each second.
-	if counter%ebiten.MaxTPS() == 0 {
+	if g.counter%ebiten.MaxTPS() == 0 {
-		kanjiText = []rune{}
+		g.kanjiText = nil
 		for j := 0; j < 4; j++ {
 			for i := 0; i < 8; i++ {
-				kanjiText = append(kanjiText, jaKanjis[rand.Intn(len(jaKanjis))])
+				g.kanjiText = append(g.kanjiText, jaKanjis[rand.Intn(len(jaKanjis))])
 			}
-			kanjiText = append(kanjiText, '\n')
+			g.kanjiText = append(g.kanjiText, '\n')
 		}
 
-		kanjiTextColor.R = 0x80 + uint8(rand.Intn(0x7f))
+		g.kanjiTextColor.R = 0x80 + uint8(rand.Intn(0x7f))
-		kanjiTextColor.G = 0x80 + uint8(rand.Intn(0x7f))
+		g.kanjiTextColor.G = 0x80 + uint8(rand.Intn(0x7f))
-		kanjiTextColor.B = 0x80 + uint8(rand.Intn(0x7f))
+		g.kanjiTextColor.B = 0x80 + uint8(rand.Intn(0x7f))
-		kanjiTextColor.A = 0xff
+		g.kanjiTextColor.A = 0xff
 	}
-	counter++
+	g.counter++
-
-	if ebiten.IsDrawingSkipped() {
 	return nil
 }
 
+func (g *Game) Draw(screen *ebiten.Image) {
 	const x = 20
 
 	// Draw info
@@ -147,14 +148,19 @@ func update(screen *ebiten.Image) error {
 	text.Draw(screen, sampleText, mplusNormalFont, x, 80, color.White)
 
 	// Draw Kanji text lines
-	for i, line := range strings.Split(string(kanjiText), "\n") {
+	for i, line := range strings.Split(string(g.kanjiText), "\n") {
-		text.Draw(screen, line, mplusBigFont, x, 160+54*i, kanjiTextColor)
+		text.Draw(screen, line, mplusBigFont, x, 160+54*i, g.kanjiTextColor)
 	}
-	return nil
+}
+
+func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return screenWidth, screenHeight
 }
 
 func main() {
-	if err := ebiten.Run(update, screenWidth, screenHeight, 1, "Font (Ebiten Demo)"); err != nil {
+	ebiten.SetWindowSize(screenWidth, screenHeight)
+	ebiten.SetWindowTitle("Font (Ebiten Demo)")
+	if err := ebiten.RunGame(&Game{}); err != nil {
 		log.Fatal(err)
 	}
 }