Add ui.UI

example/main.go

@@ -8,6 +8,7 @@ import (
 	"github.com/hajimehoshi/go-ebiten/example/game/rects"
 	"github.com/hajimehoshi/go-ebiten/example/game/rotating"
 	"github.com/hajimehoshi/go-ebiten/example/game/sprites"
+	"github.com/hajimehoshi/go-ebiten/ui"
 	"github.com/hajimehoshi/go-ebiten/ui/cocoa"
 	_ "github.com/hajimehoshi/go-ebiten/ui/glut"
 	"os"
@@ -41,5 +42,6 @@ func main() {
 	}
 
 	const screenScale = 2
-	cocoa.Run(game, 256, 240, screenScale, "Ebiten Demo")
+	cocoaUI := cocoa.New(256, 240, screenScale, "Ebiten Demo")
+	ui.Run(cocoaUI, game)
 }

ui/cocoa/cocoa.go

@@ -12,7 +12,6 @@ import "C"
 import (
 	"github.com/hajimehoshi/go-ebiten"
 	"github.com/hajimehoshi/go-ebiten/graphics/opengl"
-	"time"
 	"unsafe"
 )
 
@@ -20,16 +19,74 @@ type UI struct {
 	screenWidth    int
 	screenHeight   int
 	screenScale    int
-	graphicsDevice *opengl.Device
+	title          string
 	initializing   chan ebiten.Game
 	initialized    chan ebiten.Game
 	updating       chan ebiten.Game
 	updated        chan ebiten.Game
 	input          chan ebiten.InputState
+	graphicsDevice *opengl.Device
 }
 
 var currentUI *UI
 
+func New(screenWidth, screenHeight, screenScale int, title string) *UI {
+	if currentUI != nil {
+		panic("UI can't be duplicated.")
+	}
+	ui := &UI{
+		screenWidth:  screenWidth,
+		screenHeight: screenHeight,
+		screenScale:  screenScale,
+		title:        title,
+		initializing: make(chan ebiten.Game),
+		initialized:  make(chan ebiten.Game),
+		updating:     make(chan ebiten.Game),
+		updated:      make(chan ebiten.Game),
+		input:        make(chan ebiten.InputState),
+	}
+	currentUI = ui
+	return ui
+}
+
+func (ui *UI) MainLoop() {
+	cTitle := C.CString(ui.title)
+	defer C.free(unsafe.Pointer(cTitle))
+
+	C.Run(C.size_t(ui.screenWidth),
+		C.size_t(ui.screenHeight),
+		C.size_t(ui.screenScale),
+		cTitle)
+}
+
+func (ui *UI) ScreenWidth() int {
+	return ui.screenWidth
+}
+
+func (ui *UI) ScreenHeight() int {
+	return ui.screenHeight
+}
+
+func (ui *UI) Initializing() chan<- ebiten.Game {
+	return ui.initializing
+}
+
+func (ui *UI) Initialized() <-chan ebiten.Game {
+	return ui.initialized
+}
+
+func (ui *UI) Updating() chan<- ebiten.Game {
+	return ui.updating
+}
+
+func (ui *UI) Updated() <-chan ebiten.Game {
+	return ui.updated
+}
+
+func (ui *UI) Input() <-chan ebiten.InputState {
+	return ui.input
+}
+
 //export ebiten_EbitenOpenGLView_Initialized
 func ebiten_EbitenOpenGLView_Initialized() {
 	if currentUI.graphicsDevice != nil {
@@ -76,64 +133,3 @@ func ebiten_EbitenOpenGLView_InputUpdated(inputType C.InputType, cx, cy C.int) {
 	}
 	currentUI.input <- ebiten.InputState{x, y}
 }
-
-func Run(game ebiten.Game, screenWidth, screenHeight, screenScale int,
-	title string) {
-	currentUI = &UI{
-		screenWidth:  screenWidth,
-		screenHeight: screenHeight,
-		screenScale:  screenScale,
-		initializing: make(chan ebiten.Game),
-		initialized:  make(chan ebiten.Game),
-		updating:     make(chan ebiten.Game),
-		updated:      make(chan ebiten.Game),
-		input:        make(chan ebiten.InputState),
-	}
-
-	go func() {
-		frameTime := time.Duration(
-			int64(time.Second) / int64(ebiten.FPS))
-		tick := time.Tick(frameTime)
-		gameContext := &GameContext{
-			screenWidth:  screenWidth,
-			screenHeight: screenHeight,
-			inputState:   ebiten.InputState{-1, -1},
-		}
-		currentUI.initializing <- game
-		game = <-currentUI.initialized
-		for {
-			select {
-			case gameContext.inputState = <-currentUI.input:
-			case <-tick:
-				game.Update(gameContext)
-			case currentUI.updating <- game:
-				game = <-currentUI.updated
-			}
-		}
-	}()
-
-	cTitle := C.CString(title)
-	defer C.free(unsafe.Pointer(cTitle))
-	C.Run(C.size_t(screenWidth),
-		C.size_t(screenHeight),
-		C.size_t(screenScale),
-		cTitle)
-}
-
-type GameContext struct {
-	screenWidth  int
-	screenHeight int
-	inputState   ebiten.InputState
-}
-
-func (context *GameContext) ScreenWidth() int {
-	return context.screenWidth
-}
-
-func (context *GameContext) ScreenHeight() int {
-	return context.screenHeight
-}
-
-func (context *GameContext) InputState() ebiten.InputState {
-	return context.inputState
-}

ui/cocoa/ebiten_window.c

@@ -14,11 +14,13 @@
                             styleMask:style];
   NSScreen* screen = [[NSScreen screens] objectAtIndex:0];
   NSSize screenSize = [screen visibleFrame].size;
-  // Reference: Mac OS X Human Interface Guidelines: UI Element Guidelines: Windows
+  // Reference: Mac OS X Human Interface Guidelines: UI Element Guidelines:
+  // Windows
   // http://developer.apple.com/library/mac/#documentation/UserExperience/Conceptual/AppleHIGuidelines/Windows/Windows.html
-  NSRect contentRect = NSMakeRect((screenSize.width - windowRect.size.width) / 2,
+  NSRect contentRect =
-                                  (screenSize.height - windowRect.size.height) * 2 / 3,
+    NSMakeRect((screenSize.width - windowRect.size.width) / 2,
-                                  size.width, size.height);
+               (screenSize.height - windowRect.size.height) * 2 / 3,
+               size.width, size.height);
   self = [super initWithContentRect:contentRect
                           styleMask:style
                             backing:NSBackingStoreBuffered
@@ -53,9 +55,10 @@
                                    alternateButton:nil
                                        otherButton:@"Cancel"
                          informativeTextWithFormat:@""];
+    SEL selector = @selector(alertDidEnd:returnCode:contextInfo:);
     [alert beginSheetModalForWindow:sender
                       modalDelegate:self
-                     didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:)
+                     didEndSelector:selector
                         contextInfo:nil];
   }
   return NO;

ui/cocoa/run.c

@@ -7,8 +7,9 @@
 
 void Run(size_t width, size_t height, size_t scale, const char* title) {
   @autoreleasepool {
+    NSSize size = NSMakeSize(width * scale, height * scale);
     EbitenWindow* window = [[EbitenWindow alloc]
-                            initWithSize:NSMakeSize(width * scale, height * scale)];
+                            initWithSize:size];
     [window setTitle: [[NSString alloc] initWithUTF8String:title]];  
     EbitenController* controller = [[EbitenController alloc]
                                     initWithWindow:window];

ui/ui.go

@@ -0,0 +1,61 @@
+package ui
+
+import (
+	"github.com/hajimehoshi/go-ebiten"
+	"time"
+)
+
+type UI interface {
+	MainLoop()
+	ScreenWidth()  int
+	ScreenHeight() int
+	Initializing() chan<- ebiten.Game
+	Initialized()  <-chan ebiten.Game
+	Updating()     chan<- ebiten.Game
+	Updated()      <-chan ebiten.Game
+	Input()        <-chan ebiten.InputState
+}
+
+func mainLoop(ui UI, game ebiten.Game) {
+	frameTime := time.Duration(int64(time.Second) / int64(ebiten.FPS))
+	tick := time.Tick(frameTime)
+	gameContext := &GameContext{
+		screenWidth:  ui.ScreenWidth(),
+		screenHeight: ui.ScreenHeight(),
+		inputState:   ebiten.InputState{-1, -1},
+	}
+	ui.Initializing() <- game
+	game = <-ui.Initialized()
+	for {
+		select {
+		case gameContext.inputState = <-ui.Input():
+		case <-tick:
+			game.Update(gameContext)
+		case ui.Updating() <- game:
+			game = <-ui.Updated()
+		}
+	}
+}
+
+func Run(ui UI, game ebiten.Game) {
+	go mainLoop(ui, game)
+	ui.MainLoop()
+}
+
+type GameContext struct {
+	screenWidth  int
+	screenHeight int
+	inputState   ebiten.InputState
+}
+
+func (context *GameContext) ScreenWidth() int {
+	return context.screenWidth
+}
+
+func (context *GameContext) ScreenHeight() int {
+	return context.screenHeight
+}
+
+func (context *GameContext) InputState() ebiten.InputState {
+	return context.inputState
+}