Remove InputState

ebiten.go

@@ -4,19 +4,33 @@ import (
 	"github.com/hajimehoshi/go-ebiten/graphics"
 )
 
-type Game interface {
+// TODO: Remove this
-	InitTextures(tf graphics.TextureFactory)
-	Update(context GameContext)
-	Draw(canvas graphics.Canvas)
-}
-
 type GameContext interface {
 	ScreenWidth() int
 	ScreenHeight() int
-	InputState() InputState
 }
 
-type InputState struct {
+type ScreenSizeUpdatedEvent struct {
+	Width  int
+	Height int
+}
+
+type InputStateUpdatedEvent struct {
 	X int
 	Y int
 }
+
+type UIEvents interface {
+	ScreenSizeUpdated() <-chan ScreenSizeUpdatedEvent
+}
+
+type UI interface {
+	PollEvents()
+	InitTextures(func(graphics.TextureFactory))
+	Draw(func(graphics.Canvas))
+
+	InputStateUpdated() <-chan InputStateUpdatedEvent
+
+	// TODO: Remove this
+	Update(func(GameContext))
+}

example/game/input/input.go

@@ -11,11 +11,21 @@ import (
 
 type Input struct {
 	textTextureId graphics.TextureId
-	inputState    ebiten.InputState
+	inputStateCh  chan ebiten.InputStateUpdatedEvent
+	x             int
+	y             int
 }
 
 func New() *Input {
-	return &Input{}
+	return &Input{
+		inputStateCh: make(chan ebiten.InputStateUpdatedEvent, 1),
+		x:            -1,
+		y:            -1,
+	}
+}
+
+func (game *Input) InputStateUpdated() chan<- ebiten.InputStateUpdatedEvent {
+	return game.inputStateCh
 }
 
 func (game *Input) InitTextures(tf graphics.TextureFactory) {
@@ -35,14 +45,22 @@ func (game *Input) InitTextures(tf graphics.TextureFactory) {
 }
 
 func (game *Input) Update(context ebiten.GameContext) {
-	game.inputState = context.InputState()
+events:
+	for {
+		select {
+		case e := <-game.inputStateCh:
+			game.x, game.y = e.X, e.Y
+		default:
+			break events
+		}
+	}
 }
 
 func (game *Input) Draw(g graphics.Canvas) {
 	g.Fill(128, 128, 255)
 	str := fmt.Sprintf(`Input State:
   X: %d
-  Y: %d`, game.inputState.X, game.inputState.Y)
+  Y: %d`, game.x, game.y)
 	game.drawText(g, str, 5, 5)
 }
 

example/main.go

@@ -17,6 +17,12 @@ import (
 	"time"
 )
 
+type Game interface {
+	InitTextures(tf graphics.TextureFactory)
+	Update(context ebiten.GameContext)
+	Draw(canvas graphics.Canvas)
+}
+
 func main() {
 	runtime.GOMAXPROCS(runtime.NumCPU())
 
@@ -25,7 +31,7 @@ func main() {
 		gameName = os.Args[1]
 	}
 
-	var game ebiten.Game
+	var game Game
 	switch gameName {
 	case "blank":
 		game = blank.New()
@@ -50,7 +56,8 @@ func main() {
 	const screenScale = 2
 	const fps = 60
 	const title = "Ebiten Demo"
-	ui := cocoa.New(screenWidth, screenHeight, screenScale, title)
+
+	var ui ebiten.UI = cocoa.New(screenWidth, screenHeight, screenScale, title)
 	ui.InitTextures(game.InitTextures)
 
 	lock := sync.Mutex{}
@@ -66,8 +73,24 @@ func main() {
 			})
 		}
 	}()
+
+	inputStateUpdated := ui.InputStateUpdated()
 	for {
 		ui.PollEvents()
+	events:
+		for {
+			select {
+			case e := <-inputStateUpdated:
+				type InputStateUpdatedHandler interface {
+					InputStateUpdated() chan<- ebiten.InputStateUpdatedEvent
+				}
+				if game2, ok := game.(InputStateUpdatedHandler); ok {
+					game2.InputStateUpdated() <- e
+				}
+			default:
+				break events
+			}
+		}
 		ui.Draw(func(c graphics.Canvas) {
 			lock.Lock()
 			defer lock.Unlock()

ui/cocoa/cocoa.go

@@ -20,7 +20,6 @@ import (
 	"github.com/hajimehoshi/go-ebiten/graphics"
 	"github.com/hajimehoshi/go-ebiten/graphics/opengl"
 	"runtime"
-	"sync"
 	"unsafe"
 )
 
@@ -31,7 +30,6 @@ func init() {
 type GameContext struct {
 	screenWidth  int
 	screenHeight int
-	inputState   ebiten.InputState
 }
 
 func (context *GameContext) ScreenWidth() int {
@@ -42,18 +40,15 @@ func (context *GameContext) ScreenHeight() int {
 	return context.screenHeight
 }
 
-func (context *GameContext) InputState() ebiten.InputState {
-	return context.inputState
-}
-
 type UI struct {
 	screenWidth               int
 	screenHeight              int
 	screenScale               int
 	graphicsDevice            *opengl.Device
 	gameContext               *GameContext
-	gameContextLock sync.Mutex
 	window                    unsafe.Pointer
+	inputStateUpdatedChs      chan chan ebiten.InputStateUpdatedEvent
+	inputStateUpdatedNotified chan ebiten.InputStateUpdatedEvent
 }
 
 var currentUI *UI
@@ -69,9 +64,9 @@ func New(screenWidth, screenHeight, screenScale int, title string) *UI {
 		gameContext: &GameContext{
 			screenWidth:  screenWidth,
 			screenHeight: screenHeight,
-			inputState:   ebiten.InputState{-1, -1},
 		},
-		gameContextLock: sync.Mutex{},
+		inputStateUpdatedChs:      make(chan chan ebiten.InputStateUpdatedEvent),
+		inputStateUpdatedNotified: make(chan ebiten.InputStateUpdatedEvent),
 	}
 
 	cTitle := C.CString(title)
@@ -91,9 +86,26 @@ func New(screenWidth, screenHeight, screenScale int, title string) *UI {
 		cTitle,
 		context)
 	currentUI = ui
+
+	go ui.chLoop()
+
 	return ui
 }
 
+func (ui *UI) chLoop() {
+	inputStateUpdated := []chan ebiten.InputStateUpdatedEvent{}
+	for {
+		select {
+		case ch := <-ui.inputStateUpdatedChs:
+			inputStateUpdated = append(inputStateUpdated, ch)
+		case e := <-ui.inputStateUpdatedNotified:
+			for _, ch := range inputStateUpdated {
+				ch <- e
+			}
+		}
+	}
+}
+
 func (ui *UI) PollEvents() {
 	C.PollEvents()
 }
@@ -105,8 +117,6 @@ func (ui *UI) InitTextures(f func(graphics.TextureFactory)) {
 }
 
 func (ui *UI) Update(f func(ebiten.GameContext)) {
-	ui.gameContextLock.Lock()
-	defer ui.gameContextLock.Unlock()
 	f(ui.gameContext)
 }
 
@@ -116,15 +126,27 @@ func (ui *UI) Draw(f func(graphics.Canvas)) {
 	C.EndDrawing(ui.window)
 }
 
+func (ui *UI) InputStateUpdated() <-chan ebiten.InputStateUpdatedEvent {
+	ch := make(chan ebiten.InputStateUpdatedEvent)
+	go func() {
+		ui.inputStateUpdatedChs <- ch
+	}()
+	return ch
+}
+
+func (ui *UI) notifyInputStateUpdated(e ebiten.InputStateUpdatedEvent) {
+	go func() {
+		ui.inputStateUpdatedNotified <- e
+	}()
+}
+
 //export ebiten_InputUpdated
 func ebiten_InputUpdated(inputType C.InputType, cx, cy C.int) {
 	ui := currentUI
 
-	ui.gameContextLock.Lock()
-	defer ui.gameContextLock.Unlock()
-
 	if inputType == C.InputTypeMouseUp {
-		ui.gameContext.inputState = ebiten.InputState{-1, -1}
+		e := ebiten.InputStateUpdatedEvent{-1, -1}
+		ui.notifyInputStateUpdated(e)
 		return
 	}
 
@@ -141,5 +163,6 @@ func ebiten_InputUpdated(inputType C.InputType, cx, cy C.int) {
 	} else if ui.screenHeight <= y {
 		y = ui.screenHeight - 1
 	}
-	ui.gameContext.inputState = ebiten.InputState{x, y}
+	e := ebiten.InputStateUpdatedEvent{x, y}
+	ui.notifyInputStateUpdated(e)
 }

ui/ui.go

@@ -1 +0,0 @@
-package ui