Add cocoa.window

ui/cocoa/cocoa.go

@@ -7,8 +7,6 @@ package cocoa
 //
 // void StartApplication(void);
 // void PollEvents(void);
-// void BeginDrawing(void* window);
-// void EndDrawing(void* window);
 //
 import "C"
 import (
@@ -16,14 +14,13 @@ import (
 	"github.com/hajimehoshi/go-ebiten/graphics/opengl"
 	"github.com/hajimehoshi/go-ebiten/ui"
 	"image"
-	"unsafe"
 )
 
 type UI struct {
 	screenWidth      int
 	screenHeight     int
 	screenScale      int
-	window           unsafe.Pointer
+	window           *window
 	initialEventSent bool
 	textureFactory   *textureFactory
 	graphicsDevice   *opengl.Device
@@ -114,10 +111,9 @@ func (u *UI) RenderTargetCreated() <-chan graphics.RenderTargetCreatedEvent {
 }
 
 func (u *UI) Draw(f func(graphics.Canvas)) {
-	// TODO: Use UseContext instead
-	C.BeginDrawing(u.window)
-	u.graphicsDevice.Update(f)
-	C.EndDrawing(u.window)
+	u.window.UseContext(func() {
+		u.graphicsDevice.Update(f)
+	})
 }
 
 //export ebiten_ScreenSizeUpdated

ui/cocoa/mainloop.c

@@ -50,9 +50,8 @@ void* CreateGLContext(void* sharedGLContext) {
   return glContext;
 }
 
-void* CreateWindow(size_t width, size_t height, const char* title, void* sharedGLContext) {
-  NSOpenGLContext* glContext = CreateGLContext(sharedGLContext);
-  [glContext makeCurrentContext];
+void* CreateWindow(size_t width, size_t height, const char* title, void* glContext_) {
+  NSOpenGLContext* glContext = (NSOpenGLContext*)glContext_;
 
   NSSize size = NSMakeSize(width, height);
   EbitenWindow* window = [[EbitenWindow alloc]
@@ -95,6 +94,10 @@ void UnuseGLContext(void) {
   CGLUnlockContext(cglContext);
 }
 
+void* GetGLContext(void* window) {
+  return [(EbitenWindow*)window glContext];
+}
+
 void BeginDrawing(void* window) {
   // TODO: CGLLock
   [[(EbitenWindow*)window glContext] makeCurrentContext];

ui/cocoa/texture_factory.go

@@ -1,15 +1,12 @@
 package cocoa
 
-// #include <stdlib.h>
-//
 // void* CreateGLContext(void* sharedGLContext);
-// void* CreateWindow(size_t width, size_t height, const char* title, void* sharedGLContext);
 // void UseGLContext(void* glContext);
 // void UnuseGLContext(void);
 //
 import "C"
 import (
-	//"github.com/hajimehoshi/go-ebiten/graphics"
+	"runtime"
 	"unsafe"
 )
 
@@ -22,11 +19,12 @@ type textureFactory struct {
 
 func runTextureFactory() *textureFactory {
 	t := &textureFactory{
-		funcs: make(chan func()),
+		funcs:     make(chan func()),
 		funcsDone: make(chan struct{}),
 	}
 	ch := make(chan struct{})
 	go func() {
+		runtime.LockOSThread()
 		t.sharedContext = C.CreateGLContext(unsafe.Pointer(nil))
 		close(ch)
 		t.loop()
@@ -52,12 +50,6 @@ func (t *textureFactory) UseContext(f func()) {
 	<-t.funcsDone
 }
 
-func (t *textureFactory) CreateWindow(width, height int, title string) unsafe.Pointer {
-	cTitle := C.CString(title)
-	defer C.free(unsafe.Pointer(cTitle))
-
-	return C.CreateWindow(C.size_t(width),
-		C.size_t(height),
-		cTitle,
-		t.sharedContext)
+func (t *textureFactory) CreateWindow(width, height int, title string) *window {
+	return runWindow(width, height, title, t.sharedContext)
 }

ui/cocoa/window.go

@@ -0,0 +1,65 @@
+package cocoa
+
+// #include <stdlib.h>
+//
+// void* CreateWindow(size_t width, size_t height, const char* title, void* glContext);
+// void* CreateGLContext(void* sharedGLContext);
+//
+// void* GetGLContext(void* window);
+// void UseGLContext(void* glContext);
+// void UnuseGLContext(void);
+//
+import "C"
+import (
+	"runtime"
+	"unsafe"
+)
+
+type window struct {
+	native    unsafe.Pointer
+	funcs     chan func()
+	funcsDone chan struct{}
+}
+
+func runWindow(width, height int, title string, sharedContext unsafe.Pointer) *window {
+	w := &window{
+		funcs:     make(chan func()),
+		funcsDone: make(chan struct{}),
+	}
+
+	cTitle := C.CString(title)
+	defer C.free(unsafe.Pointer(cTitle))
+
+	ch := make(chan struct{})
+	go func() {
+		runtime.LockOSThread()
+		glContext := C.CreateGLContext(sharedContext)
+		w.native = C.CreateWindow(C.size_t(width),
+			C.size_t(height),
+			cTitle,
+			glContext)
+		close(ch)
+		w.loop()
+	}()
+	<-ch
+	// TODO: Activate here?
+	return w
+}
+
+func (w *window) loop() {
+	for {
+		select {
+		case f := <-w.funcs:
+			glContext := C.GetGLContext(w.native)
+			C.UseGLContext(glContext)
+			f()
+			C.UnuseGLContext()
+			w.funcsDone <- struct{}{}
+		}
+	}
+}
+
+func (w *window) UseContext(f func()) {
+	w.funcs <- f
+	<-w.funcsDone
+}