Add GameContext; Remove Input and TextureFactory

gamecontext.go

@@ -0,0 +1,35 @@
+/*
+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
+
+import (
+	"image"
+)
+
+type GameContext interface {
+	IsKeyPressed(key Key) bool
+	CursorPosition() (x, y int)
+	IsMouseButtonPressed(mouseButton MouseButton) bool
+	NewRenderTargetID(width, height int, filter Filter) (RenderTargetID, error)
+	NewTextureID(img image.Image, filter Filter) (TextureID, error)
+}
+
+var currentGameContext GameContext
+
+func SetGameContext(g GameContext) {
+	currentGameContext = g
+}

input.go

@@ -37,35 +37,23 @@ const (
 	MouseButtonMax
 )
 
-type Input interface {
-	IsKeyPressed(key Key) bool
-	CursorPosition() (x, y int)
-	IsMouseButtonPressed(mouseButton MouseButton) bool
-}
-
-var currentInput Input
-
-func SetInput(input Input) {
-	currentInput = input
-}
-
 func IsKeyPressed(key Key) bool {
-	if currentInput == nil {
-		panic("ebiten.IsKeyPressed: currentInput is not set")
+	if currentGameContext == nil {
+		panic("ebiten.IsKeyPressed: currentGameContext is not set")
 	}
-	return currentInput.IsKeyPressed(key)
+	return currentGameContext.IsKeyPressed(key)
 }
 
 func CursorPosition() (x, y int) {
-	if currentInput == nil {
-		panic("ebiten.CurrentPosition: currentInput is not set")
+	if currentGameContext == nil {
+		panic("ebiten.CurrentPosition: currentGameContext is not set")
 	}
-	return currentInput.CursorPosition()
+	return currentGameContext.CursorPosition()
 }
 
 func IsMouseButtonPressed(button MouseButton) bool {
-	if currentInput == nil {
-		panic("ebiten.IsMouseButtonPressed: currentInput is not set")
+	if currentGameContext == nil {
+		panic("ebiten.IsMouseButtonPressed: currentGameContext is not set")
 	}
-	return currentInput.IsMouseButtonPressed(button)
+	return currentGameContext.IsMouseButtonPressed(button)
 }

internal/glfw/canvas.go

@@ -25,22 +25,22 @@ import (
 )
 
 type canvas struct {
-	window    *glfw.Window
-	context   *opengl.GraphicsContext
-	input     input
-	funcs     chan func()
-	funcsDone chan struct{}
+	window          *glfw.Window
+	graphicsContext *opengl.GraphicsContext
+	input           input
+	funcs           chan func()
+	funcsDone       chan struct{}
 }
 
 func (c *canvas) draw(d GraphicsContextDrawer) (err error) {
 	c.use(func() {
-		c.context.PreUpdate()
+		c.graphicsContext.PreUpdate()
 	})
-	if err = d.Draw(&context{c}); err != nil {
+	if err = d.Draw(&graphicsContext{c}); err != nil {
 		return
 	}
 	c.use(func() {
-		c.context.PostUpdate()
+		c.graphicsContext.PostUpdate()
 		c.window.SwapBuffers()
 	})
 	return
@@ -88,3 +88,15 @@ func (c *canvas) use(f func()) {
 func (c *canvas) update() {
 	c.input.update(c.window)
 }
+
+func (c *canvas) IsKeyPressed(key ebiten.Key) bool {
+	return c.input.IsKeyPressed(key)
+}
+
+func (c *canvas) IsMouseButtonPressed(button ebiten.MouseButton) bool {
+	return c.input.IsMouseButtonPressed(button)
+}
+
+func (c *canvas) CursorPosition() (x, y int) {
+	return c.input.CursorPosition()
+}

internal/glfw/context.go

@@ -20,53 +20,53 @@ import (
 	"github.com/hajimehoshi/ebiten"
 )
 
-type context struct {
+type graphicsContext struct {
 	canvas *canvas
 }
 
-var _ ebiten.GraphicsContext = new(context)
+var _ ebiten.GraphicsContext = new(graphicsContext)
 
-func (c *context) Clear() {
+func (c *graphicsContext) Clear() {
 	c.canvas.use(func() {
-		c.canvas.context.Clear()
+		c.canvas.graphicsContext.Clear()
 	})
 }
 
-func (c *context) Fill(r, g, b uint8) {
+func (c *graphicsContext) Fill(r, g, b uint8) {
 	c.canvas.use(func() {
-		c.canvas.context.Fill(r, g, b)
+		c.canvas.graphicsContext.Fill(r, g, b)
 	})
 }
 
-func (c *context) Texture(id ebiten.TextureID) (d ebiten.Drawer) {
+func (c *graphicsContext) Texture(id ebiten.TextureID) (d ebiten.Drawer) {
 	c.canvas.use(func() {
 		d = &drawer{
 			canvas:      c.canvas,
-			innerDrawer: c.canvas.context.Texture(id),
+			innerDrawer: c.canvas.graphicsContext.Texture(id),
 		}
 	})
 	return
 }
 
-func (c *context) RenderTarget(id ebiten.RenderTargetID) (d ebiten.Drawer) {
+func (c *graphicsContext) RenderTarget(id ebiten.RenderTargetID) (d ebiten.Drawer) {
 	c.canvas.use(func() {
 		d = &drawer{
 			canvas:      c.canvas,
-			innerDrawer: c.canvas.context.RenderTarget(id),
+			innerDrawer: c.canvas.graphicsContext.RenderTarget(id),
 		}
 	})
 	return
 }
 
-func (c *context) ResetOffscreen() {
+func (c *graphicsContext) ResetOffscreen() {
 	c.canvas.use(func() {
-		c.canvas.context.ResetOffscreen()
+		c.canvas.graphicsContext.ResetOffscreen()
 	})
 }
 
-func (c *context) SetOffscreen(id ebiten.RenderTargetID) {
+func (c *graphicsContext) SetOffscreen(id ebiten.RenderTargetID) {
 	c.canvas.use(func() {
-		c.canvas.context.SetOffscreen(id)
+		c.canvas.graphicsContext.SetOffscreen(id)
 	})
 }
 

internal/glfw/ui.go

@@ -53,8 +53,7 @@ func (u *UI) Start(width, height, scale int, title string) error {
 		funcs:     make(chan func()),
 		funcsDone: make(chan struct{}),
 	}
-	ebiten.SetInput(&c.input)
-	ebiten.SetTextureFactory(c)
+	ebiten.SetGameContext(c)
 
 	c.run(width, height, scale)
 
@@ -62,13 +61,14 @@ func (u *UI) Start(width, height, scale int, title string) error {
 	windowWidth, _ := window.GetFramebufferSize()
 	realScale := windowWidth / width
 	c.use(func() {
-		c.context, err = opengl.Initialize(width, height, realScale)
+		c.graphicsContext, err = opengl.Initialize(width, height, realScale)
 	})
 	if err != nil {
 		return err
 	}
 
 	u.canvas = c
+
 	return nil
 }
 

texturefactory.go

@@ -47,33 +47,18 @@ func (i RenderTargetID) IsNil() bool {
 	return i == 0
 }
 
-var currentTextureFactory TextureFactory
-
-// A TextureFactory is the interface that creates a render target or a texture.
-// This method is for the library and a game developer doesn't have to use this.
-type TextureFactory interface {
-	NewRenderTargetID(width, height int, filter Filter) (RenderTargetID, error)
-	NewTextureID(img image.Image, filter Filter) (TextureID, error)
-}
-
-// SetTextureFactory sets the current texture factory.
-// This method is for the library and a game developer doesn't have to use this.
-func SetTextureFactory(textureFactory TextureFactory) {
-	currentTextureFactory = textureFactory
-}
-
 // NewRenderTargetID returns an ID of a newly created render target.
 func NewRenderTargetID(width, height int, filter Filter) (RenderTargetID, error) {
-	if currentTextureFactory == nil {
-		panic("graphics.NewRenderTarget: currentTextureFactory is not set.")
+	if currentGameContext == nil {
+		panic("graphics.NewRenderTarget: currentGameContext is not set.")
 	}
-	return currentTextureFactory.NewRenderTargetID(width, height, filter)
+	return currentGameContext.NewRenderTargetID(width, height, filter)
 }
 
 // NewRenderTargetID returns an ID of a newly created texture.
 func NewTextureID(img image.Image, filter Filter) (TextureID, error) {
-	if currentTextureFactory == nil {
-		panic("graphics.NewTexture: currentTextureFactory is not set")
+	if currentGameContext == nil {
+		panic("graphics.NewTexture: currentGameContext is not set")
 	}
-	return currentTextureFactory.NewTextureID(img, filter)
+	return currentGameContext.NewTextureID(img, filter)
 }