Unify keyboard and mouse to input

glfw/canvas.go

@@ -27,8 +27,7 @@ import (
 type canvas struct {
 	window    *glfw.Window
 	context   *opengl.GraphicsContext
-	keyboard  keyboard
-	mouse     mouse
+	input     input
 	funcs     chan func()
 	funcsDone chan struct{}
 }
@@ -87,6 +86,5 @@ func (c *canvas) use(f func()) {
 }
 
 func (c *canvas) update() {
-	c.keyboard.update(c.window)
-	c.mouse.update(c.window)
+	c.input.update(c.window)
 }

glfw/input.go

@@ -19,14 +19,26 @@ package glfw
 import (
 	glfw "github.com/go-gl/glfw3"
 	"github.com/hajimehoshi/ebiten"
+	"math"
 )
 
-type keyboard struct {
-	keyPressed [ebiten.KeyMax]bool
+type input struct {
+	keyPressed         [ebiten.KeyMax]bool
+	mouseButtonPressed [ebiten.MouseButtonMax]bool
+	cursorX            int
+	cursorY            int
 }
 
-func (k *keyboard) IsKeyPressed(key ebiten.Key) bool {
-	return k.keyPressed[key]
+func (i *input) IsKeyPressed(key ebiten.Key) bool {
+	return i.keyPressed[key]
+}
+
+func (i *input) IsMouseButtonPressed(button ebiten.MouseButton) bool {
+	return i.mouseButtonPressed[button]
+}
+
+func (i *input) CursorPosition() (x, y int) {
+	return i.cursorX, i.cursorY
 }
 
 var glfwKeyCodeToKey = map[glfw.Key]ebiten.Key{
@@ -37,8 +49,14 @@ var glfwKeyCodeToKey = map[glfw.Key]ebiten.Key{
 	glfw.KeyDown:  ebiten.KeyDown,
 }
 
-func (k *keyboard) update(window *glfw.Window) {
+func (i *input) update(window *glfw.Window) {
 	for g, u := range glfwKeyCodeToKey {
-		k.keyPressed[u] = window.GetKey(g) == glfw.Press
+		i.keyPressed[u] = window.GetKey(g) == glfw.Press
 	}
+	for b := ebiten.MouseButtonLeft; b < ebiten.MouseButtonMax; b++ {
+		i.mouseButtonPressed[b] = window.GetMouseButton(glfw.MouseButton(b)) == glfw.Press
+	}
+	x, y := window.GetCursorPosition()
+	i.cursorX = int(math.Floor(x))
+	i.cursorY = int(math.Floor(y))
 }

glfw/mouse.go

@@ -1,46 +0,0 @@
-/*
-Copyright 2014 Hajime Hoshi
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package glfw
-
-import (
-	glfw "github.com/go-gl/glfw3"
-	"github.com/hajimehoshi/ebiten"
-	"math"
-)
-
-type mouse struct {
-	buttonPressed [ebiten.MouseButtonMax]bool
-	x             int
-	y             int
-}
-
-func (m *mouse) CursorPosition() (x, y int) {
-	return m.x, m.y
-}
-
-func (m *mouse) IsMouseButtonPressed(button ebiten.MouseButton) bool {
-	return m.buttonPressed[button]
-}
-
-func (m *mouse) update(window *glfw.Window) {
-	x, y := window.GetCursorPosition()
-	m.x = int(math.Floor(x))
-	m.y = int(math.Floor(y))
-	for i := ebiten.MouseButtonLeft; i < ebiten.MouseButtonMax; i++ {
-		m.buttonPressed[i] = window.GetMouseButton(glfw.MouseButton(i)) == glfw.Press
-	}
-}

glfw/ui.go

@@ -49,8 +49,7 @@ func (u *UI) Start(width, height, scale int, title string) (ebiten.Canvas, error
 		funcs:     make(chan func()),
 		funcsDone: make(chan struct{}),
 	}
-	ebiten.SetKeyboard(&c.keyboard)
-	ebiten.SetMouse(&c.mouse)
+	ebiten.SetInput(&c.input)
 	ebiten.SetTextureFactory(c)
 
 	c.run(width, height, scale)

input.go

@@ -16,6 +16,18 @@ limitations under the License.
 
 package ebiten
 
+type Key int
+
+// TODO: Add more keys.
+const (
+	KeyUp Key = iota
+	KeyDown
+	KeyLeft
+	KeyRight
+	KeySpace
+	KeyMax
+)
+
 type MouseButton int
 
 const (
@@ -25,27 +37,35 @@ const (
 	MouseButtonMax
 )
 
-var currentMouse Mouse
-
-type Mouse interface {
+type Input interface {
+	IsKeyPressed(key Key) bool
 	CursorPosition() (x, y int)
 	IsMouseButtonPressed(mouseButton MouseButton) bool
 }
 
-func SetMouse(mouse Mouse) {
-	currentMouse = mouse
+var currentInput Input
+
+func SetInput(input Input) {
+	currentInput = input
+}
+
+func IsKeyPressed(key Key) bool {
+	if currentInput == nil {
+		panic("ebiten.IsKeyPressed: currentInput is not set")
+	}
+	return currentInput.IsKeyPressed(key)
 }
 
 func CursorPosition() (x, y int) {
-	if currentMouse == nil {
-		panic("input.CurrentPosition: currentMouse is not set")
+	if currentInput == nil {
+		panic("ebiten.CurrentPosition: currentInput is not set")
 	}
-	return currentMouse.CursorPosition()
+	return currentInput.CursorPosition()
 }
 
 func IsMouseButtonPressed(button MouseButton) bool {
-	if currentMouse == nil {
-		panic("input.IsMouseButtonPressed: currentMouse is not set")
+	if currentInput == nil {
+		panic("ebiten.IsMouseButtonPressed: currentInput is not set")
 	}
-	return currentMouse.IsMouseButtonPressed(button)
+	return currentInput.IsMouseButtonPressed(button)
 }

keyboard.go

@@ -1,46 +0,0 @@
-/*
-Copyright 2014 Hajime Hoshi
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package ebiten
-
-type Key int
-
-// TODO: Add more keys.
-const (
-	KeyUp Key = iota
-	KeyDown
-	KeyLeft
-	KeyRight
-	KeySpace
-	KeyMax
-)
-
-var currentKeyboard Keyboard
-
-type Keyboard interface {
-	IsKeyPressed(key Key) bool
-}
-
-func SetKeyboard(keyboard Keyboard) {
-	currentKeyboard = keyboard
-}
-
-func IsKeyPressed(key Key) bool {
-	if currentKeyboard == nil {
-		panic("input.IsKeyPressed: currentKeyboard is not set")
-	}
-	return currentKeyboard.IsKeyPressed(key)
-}

run.go

@@ -28,8 +28,11 @@ type Game interface {
 	Draw(context GraphicsContext) error
 }
 
-func Run(u UI, game Game, width, height, scale int, title string, fps int) error {
-	canvas, err := u.Start(width, height, scale, title)
+// Run runs the game. Basically, this function executes ui.Start() at the start,
+// calls ui.DoEvent(), game.Update() and game.Draw() at a regular interval, and finally
+// calls ui.Terminate().
+func Run(ui UI, game Game, width, height, scale int, title string, fps int) error {
+	canvas, err := ui.Start(width, height, scale, title)
 	if err != nil {
 		return err
 	}
@@ -39,9 +42,9 @@ func Run(u UI, game Game, width, height, scale int, title string, fps int) error
 	sigterm := make(chan os.Signal, 1)
 	signal.Notify(sigterm, os.Interrupt, syscall.SIGTERM)
 
-	defer u.Terminate()
+	defer ui.Terminate()
 	for {
-		u.DoEvents()
+		ui.DoEvents()
 		select {
 		default:
 			if err := canvas.Draw(game); err != nil {