Add Game.Fps

ebiten.go

@@ -14,6 +14,7 @@ type TapInfo struct {
 type Game interface {
 	ScreenWidth() int
 	ScreenHeight() int
+	Fps() int
 	Init(tf graphics.TextureFactory)
 	Update()
 	Draw(g graphics.GraphicsContext, offscreen graphics.Texture)
@@ -34,7 +35,7 @@ func OpenGLRun(game Game, ui UI, screenScale int) {
 		})
 
 	go func() {
-		const frameTime = time.Second / 60
+		frameTime := time.Duration(int64(time.Second) / int64(game.Fps()))
 		tick := time.Tick(frameTime)
 		for {
 			<-tick

example/game/rects/rects.go

@@ -24,6 +24,10 @@ func (game *Rects) ScreenHeight() int {
 	return 240
 }
 
+func (game *Rects) Fps() int {
+	return 60
+}
+
 func (game *Rects) Init(tf graphics.TextureFactory) {
 	game.rectsTexture = tf.NewTexture(game.ScreenWidth(), game.ScreenHeight())
 }

example/game/rotating/rotating.go

@@ -27,6 +27,10 @@ func (game *Rotating) ScreenHeight() int {
 	return 240
 }
 
+func (game *Rotating) Fps() int {
+	return 60
+}
+
 func (game *Rotating) Init(tf graphics.TextureFactory) {
 	file, err := os.Open("ebiten.png")
 	if err != nil {
@@ -53,7 +57,7 @@ func (game *Rotating) Draw(g graphics.GraphicsContext, offscreen graphics.Textur
 	geometryMatrix := matrix.IdentityGeometry()
 	tx, ty := float64(game.ebitenTexture.Width), float64(game.ebitenTexture.Height)
 	geometryMatrix.Translate(-tx/2, -ty/2)
-	geometryMatrix.Rotate(float64(game.x) * 2 * math.Pi / (60 * 10))
+	geometryMatrix.Rotate(float64(game.x) * 2 * math.Pi / float64(game.Fps() * 10))
 	geometryMatrix.Translate(tx/2, ty/2)
 	centerX := float64(game.ScreenWidth()) / 2
 	centerY := float64(game.ScreenHeight()) / 2

example/game/sprites/sprites.go

@@ -75,6 +75,10 @@ func (game *Sprites) ScreenHeight() int {
 	return 240
 }
 
+func (game *Sprites) Fps() int {
+	return 60
+}
+
 func (game *Sprites) Init(tf graphics.TextureFactory) {
 	file, err := os.Open("ebiten.png")
 	if err != nil {