Android: Fix rotating EmulationActivity after boot fails

Time for yet another new iteration of working around the
"surface destruction during boot" problem...
This time, the strategy is to use a mutex in MainAndroid.cpp.

3 files changed, 7 insertions, 20 deletions

diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/NativeLibrary.java b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/NativeLibrary.java
index 9e7c9bb208..0c35a35da0 100644
--- a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/NativeLibrary.java
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/NativeLibrary.java
@@ -403,15 +403,13 @@ public final class NativeLibrary
    */
   public static native void StopEmulation();
 
-  public static native boolean IsBooting();
-
-  public static native void WaitUntilDoneBooting();
-
   /**
    * Returns true if emulation is running (or is paused).
    */
   public static native boolean IsRunning();
 
+  public static native boolean IsRunningAndStarted();
+
   /**
    * Enables or disables CPU block profiling
    *
@@ -487,7 +485,7 @@ public final class NativeLibrary
   private static native String GetCurrentTitleDescriptionUnchecked();
 
   public static boolean displayAlertMsg(final String caption, final String text,
-          final boolean yesNo, final boolean isWarning)
+          final boolean yesNo, final boolean isWarning, final boolean nonBlocking)
   {
     Log.error("[NativeLibrary] Alert: " + text);
     final EmulationActivity emulationActivity = sEmulationActivity.get();
@@ -498,10 +496,9 @@ public final class NativeLibrary
     }
     else
     {
-      // AlertMessages while the core is booting will deadlock if WaitUntilDoneBooting is called.
-      // We also can't use AlertMessages unless we have a non-null activity reference.
-      // As a fallback, we use toasts instead.
-      if (emulationActivity == null || IsBooting())
+      // We can't use AlertMessages unless we have a non-null activity reference
+      // and are allowed to block. As a fallback, we can use toasts.
+      if (emulationActivity == null || nonBlocking)
       {
         new Handler(Looper.getMainLooper()).post(
                 () -> Toast.makeText(DolphinApplication.getAppContext(), text, Toast.LENGTH_LONG)
diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/fragments/EmulationFragment.java b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/fragments/EmulationFragment.java
index 4cdb0051e5..cfcd28ea02 100644
--- a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/fragments/EmulationFragment.java
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/fragments/EmulationFragment.java
@@ -330,16 +330,6 @@ public final class EmulationFragment extends Fragment implements SurfaceHolder.C
         mSurface = null;
         Log.debug("[EmulationFragment] Surface destroyed.");
 
-        if (state != State.STOPPED && !NativeLibrary.IsShowingAlertMessage())
-        {
-          // In order to avoid dereferencing nullptr, we must not destroy the surface while booting
-          // the core, so wait here if necessary. An easy (but not 100% consistent) way to reach
-          // this method while the core is booting is by having landscape orientation lock enabled
-          // and starting emulation while the phone is in portrait mode, leading to the activity
-          // being recreated very soon after NativeLibrary.Run has been called.
-          NativeLibrary.WaitUntilDoneBooting();
-        }
-
         NativeLibrary.SurfaceDestroyed();
       }
     }
diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/overlay/InputOverlay.java b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/overlay/InputOverlay.java
index fe37981ab5..e9abd1a05b 100644
--- a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/overlay/InputOverlay.java
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/overlay/InputOverlay.java
@@ -148,7 +148,7 @@ public final class InputOverlay extends SurfaceView implements OnTouchListener
   public void initTouchPointer()
   {
     // Check if we have all the data we need yet
-    boolean aspectRatioAvailable = NativeLibrary.IsRunning() && !NativeLibrary.IsBooting();
+    boolean aspectRatioAvailable = NativeLibrary.IsRunningAndStarted();
     if (!aspectRatioAvailable || mSurfacePosition == null)
       return;