cmd/ebitenmobile: bug fix: graceful shutdown on context lost

Closes #3097

cmd/ebitenmobile/_files/EbitenSurfaceView.java

@@ -29,13 +29,12 @@ import {{.JavaPkg}}.ebitenmobileview.RenderRequester;
 import {{.JavaPkg}}.{{.PrefixLower}}.EbitenView;
 
 class EbitenSurfaceView extends GLSurfaceView implements RenderRequester {
+    // As GLSurfaceView can be recreated, the states must be static (#3097).
+    static private boolean errored_ = false;
+    static private boolean onceSurfaceCreated_ = false;
+    static private boolean contextLost_ = false;
 
     private class EbitenRenderer implements GLSurfaceView.Renderer {
-
-        private boolean errored_ = false;
-        private boolean onceSurfaceCreated_ = false;
-        private boolean contextLost_ = false;
-
         @Override
         public void onDrawFrame(GL10 gl) {
             if (errored_) {
@@ -100,7 +99,7 @@ class EbitenSurfaceView extends GLSurfaceView implements RenderRequester {
     }
 
     private void onContextLost() {
-        Log.v("Go", "Kill the application due to a context lost");
+        Log.e("Go", "The application was killed due to context loss");
         // TODO: Relaunch this application for better UX (#805).
         Runtime.getRuntime().exit(0);
     }

internal/ui/ui_glfw.go

@@ -81,6 +81,8 @@ type userInterfaceImpl struct {
 	initWindowMaximized        bool
 	initWindowMousePassthrough bool
 
+	initUnfocused bool
+
 	// bufferOnceSwapped must be accessed from the main thread.
 	bufferOnceSwapped bool
 
@@ -1087,6 +1089,7 @@ func (u *UserInterface) initOnMainThread(options *RunOptions) error {
 		return err
 	}
 
+	u.initUnfocused = options.InitUnfocused
 	focused := glfw.True
 	if options.InitUnfocused {
 		focused = glfw.False
@@ -1288,8 +1291,10 @@ func (u *UserInterface) update() (float64, float64, error) {
 			if err = u.window.Show(); err != nil {
 				return
 			}
-			if err = u.window.Focus(); err != nil {
-				return
+			if !u.initUnfocused {
+				if err = u.window.Focus(); err != nil {
+					return
+				}
 			}
 
 			if runtime.GOOS == "darwin" || runtime.GOOS == "windows" {