Improve Clean Exit + Audio Pausing + Improve System Language Setting

* Clean Exiting was improved by implementing a robust system for when to abandon clean exiting and simply restart the process alongside moving clean exiting to the background when the application is quit by using the back button
* Audio is now automatically paused whenever the application is moved to the background and automatically resumed when it's brought to the foreground
* The system language setting had several errors and inconsistencies which have now been fixed, it's been brought more in line with HOS language (Albeit not entirely due to no region setting in Skyline)
* Fix a bug with `ThreadLocal` where the atomic `list` pointer was uninitialized resulting in a `SEGFAULT` during the destructor

app/libraries/vklayers/LICENSE.libVkLayer_khronos_validation.txt

@@ -0,0 +1,208 @@
+The majority of files in this project use the Apache 2.0 License.
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+Any license deviations from Apache 2.0 are "more permissive" licenses.
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app/src/main/cpp/emu_jni.cpp

@@ -17,6 +17,7 @@
 #include "skyline/os.h"
 #include "skyline/jvm.h"
 #include "skyline/gpu.h"
+#include "skyline/audio.h"
 #include "skyline/input.h"
 #include "skyline/kernel/types/KProcess.h"
 
@@ -26,6 +27,7 @@ jfloat AverageFrametimeDeviationMs; //!< The average deviation of the average fr
 
 std::weak_ptr<skyline::kernel::OS> OsWeak;
 std::weak_ptr<skyline::gpu::GPU> GpuWeak;
+std::weak_ptr<skyline::audio::Audio> AudioWeak;
 std::weak_ptr<skyline::input::Input> InputWeak;
 
 // https://cs.android.com/android/platform/superproject/+/master:bionic/libc/tzcode/bionic.cpp;l=43;drc=master;bpv=1;bpt=1
@@ -86,16 +88,17 @@ extern "C" JNIEXPORT void Java_emu_skyline_EmulationActivity_executeApplication(
 
     try {
         auto os{std::make_shared<skyline::kernel::OS>(
-                jvmManager,
+            jvmManager,
-                logger,
+            logger,
-                settings,
+            settings,
-                std::string(appFilesPath),
+            std::string(appFilesPath),
-                GetTimeZoneName(),
+            GetTimeZoneName(),
-                static_cast<skyline::language::SystemLanguage>(systemLanguage),
+            static_cast<skyline::language::SystemLanguage>(systemLanguage),
-                std::make_shared<skyline::vfs::AndroidAssetFileSystem>(AAssetManager_fromJava(env, assetManager))
+            std::make_shared<skyline::vfs::AndroidAssetFileSystem>(AAssetManager_fromJava(env, assetManager))
-            )};
+        )};
         OsWeak = os;
         GpuWeak = os->state.gpu;
+        AudioWeak = os->state.audio;
         InputWeak = os->state.input;
         jvmManager->InitializeControllers();
         env->ReleaseStringUTFChars(appFilesPathJstring, appFilesPath);
@@ -125,14 +128,14 @@ extern "C" JNIEXPORT void Java_emu_skyline_EmulationActivity_executeApplication(
     close(romFd);
 }
 
-extern "C" JNIEXPORT jboolean Java_emu_skyline_EmulationActivity_stopEmulation(JNIEnv *, jobject) {
+extern "C" JNIEXPORT jboolean Java_emu_skyline_EmulationActivity_stopEmulation(JNIEnv *, jobject, jboolean join) {
     auto os{OsWeak.lock()};
     if (!os)
         return false;
     auto process{os->state.process};
     if (!process)
         return false;
-    process->Kill(true, false, true);
+    process->Kill(join, false, true);
     return true;
 }
 
@@ -144,6 +147,15 @@ extern "C" JNIEXPORT jboolean Java_emu_skyline_EmulationActivity_setSurface(JNIE
     return true;
 }
 
+extern "C" JNIEXPORT void Java_emu_skyline_EmulationActivity_changeAudioStatus(JNIEnv *, jobject, jboolean play) {
+    auto audio{AudioWeak.lock()};
+    if (audio)
+        if (play)
+            audio->Resume();
+        else
+            audio->Pause();
+}
+
 extern "C" JNIEXPORT void Java_emu_skyline_EmulationActivity_updatePerformanceStatistics(JNIEnv *env, jobject thiz) {
     static jclass clazz{};
     if (!clazz)

app/src/main/cpp/skyline/audio.h

@@ -21,6 +21,14 @@ namespace skyline::audio {
 
         ~Audio();
 
+        void Pause() {
+            outputStream->requestPause();
+        }
+
+        void Resume() {
+            outputStream->requestStart();
+        }
+
         /**
          * @brief Opens a new track that can be used to play sound
          * @param channelCount The amount channels that are present in the track

app/src/main/cpp/skyline/common/language.h

@@ -20,25 +20,25 @@ namespace skyline {
          * @brief The list of all languages. Entries parameters are language, language code, system language index, application language index and map which holds a macro used for filtering some application languages that don't have a direct corresponding system language
          * @example #define LANG_ENTRY(lang, code, sysIndex, appIndex, map) func(lang, code, sysIndex, appIndex, map) <br> LANGUAGES <br> #undef LANG_ENTRY
          */
-        #define LANGUAGES                                                       \
+        #define LANGUAGES                                               \
-            LANG_ENTRY(Japanese, ja, 0, 2, MAP)                                 \
+            LANG_ENTRY(Japanese,             ja,       0,  2, MAP)      \
-            LANG_ENTRY(AmericanEnglish, en-us, 1, 0, MAP)                       \
+            LANG_ENTRY(AmericanEnglish,      en-us,    1,  0, MAP)      \
-            LANG_ENTRY(French, fr, 2, 3, MAP)                                   \
+            LANG_ENTRY(French,               fr,       2,  3, MAP)      \
-            LANG_ENTRY(German, de, 3, 4, MAP)                                   \
+            LANG_ENTRY(German,               de,       3,  4, MAP)      \
-            LANG_ENTRY(Italian, it, 4, 7, MAP)                                  \
+            LANG_ENTRY(Italian,              it,       4,  7, MAP)      \
-            LANG_ENTRY(Spanish, es, 5, 6, MAP)                                  \
+            LANG_ENTRY(Spanish,              es,       5,  6, MAP)      \
-            LANG_ENTRY(Chinese, zh-CN, 6, 14, DONT_MAP)                         \
+            LANG_ENTRY(Chinese,              zh-CN,    6, 14, DONT_MAP) \
-            LANG_ENTRY(Korean, ko, 7, 12, MAP)                                  \
+            LANG_ENTRY(Korean,               ko,       7, 12, MAP)      \
-            LANG_ENTRY(Dutch, nl, 8, 8, MAP)                                    \
+            LANG_ENTRY(Dutch,                nl,       8,  8, MAP)      \
-            LANG_ENTRY(Portuguese, pt, 9, 10, MAP)                              \
+            LANG_ENTRY(Portuguese,           pt,       9, 10, MAP)      \
-            LANG_ENTRY(Russian, ru, 10, 11, MAP)                                \
+            LANG_ENTRY(Russian,              ru,      10, 11, MAP)      \
-            LANG_ENTRY(Taiwanese, zh-TW, 11, 13, DONT_MAP)                      \
+            LANG_ENTRY(Taiwanese,            zh-TW,   11, 13, DONT_MAP) \
-            LANG_ENTRY(BritishEnglish, en-GB, 12, 1, MAP)                       \
+            LANG_ENTRY(BritishEnglish,       en-GB,   12,  1, MAP)      \
-            LANG_ENTRY(CanadianFrench, fr-CA, 13, 9, MAP)                       \
+            LANG_ENTRY(CanadianFrench,       fr-CA,   13,  9, MAP)      \
-            LANG_ENTRY(LatinAmericanSpanish, es-419, 14, 5, MAP)                \
+            LANG_ENTRY(LatinAmericanSpanish, es-419,  14,  5, MAP)      \
-            LANG_ENTRY(SimplifiedChinese, zh-Hans, 15, 14, MAP)                 \
+            LANG_ENTRY(SimplifiedChinese,    zh-Hans, 15, 14, MAP)      \
-            LANG_ENTRY(TraditionalChinese, zh-Hant, 16, 13, MAP)                \
+            LANG_ENTRY(TraditionalChinese,   zh-Hant, 16, 13, MAP)      \
-            LANG_ENTRY(BrazilianPortuguese, pt-BR, 17, 10, DONT_MAP)
+            LANG_ENTRY(BrazilianPortuguese,  pt-BR,   17, 10, DONT_MAP)
 
         /**
          * @brief Enumeration of system languages

app/src/main/cpp/skyline/common/thread_local.h

@@ -80,7 +80,7 @@ namespace skyline {
 
         pthread_key_t key;
         std::function<IntrustiveTypeNode *(ThreadLocal &)> constructor;
-        std::atomic<IntrustiveTypeNode *> list; //!< An atomic instrusive linked list of all instances of the object to call non-trivial destructors for the objects
+        std::atomic<IntrustiveTypeNode *> list{}; //!< An atomic instrusive linked list of all instances of the object to call non-trivial destructors for the objects
 
       public:
         template<typename... Args>

app/src/main/cpp/skyline/kernel/types/KSharedMemory.cpp

@@ -101,9 +101,9 @@ namespace skyline::kernel::type {
 
                 if (mmap(guest.ptr, guest.size, UnborrowPermission.Get(), MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0) == MAP_FAILED)
                     // It is likely that these exceptions will end up as asserts as the destructor is implicitly noexcept but we want to be notified about these not working so that's fine as it can be discovered in the debugger
-                    throw exception("An error occurred while remapping transfer memory as anonymous memory in guest: {}", strerror(errno));
+                    state.logger->Warn("An error occurred while remapping transfer memory as anonymous memory in guest: {}", strerror(errno));
                 else if (!host.Valid())
-                    throw exception("Expected host mapping of transfer memory to be valid during KTransferMemory destruction");
+                    state.logger->Warn("Expected host mapping of transfer memory to be valid during KTransferMemory destruction");
 
                 std::memcpy(guest.ptr, host.ptr, host.size);
 

app/src/main/cpp/skyline/nce.cpp

@@ -89,6 +89,32 @@ namespace skyline::nce {
 
             *tls = nullptr;
         } else { // If TLS wasn't restored then this occurred in host code
+            if (signal == SIGSEGV) {
+                static bool RunningUnderDebugger{[]() {
+                    std::ifstream status("/proc/self/status");
+                    constexpr std::string_view TracerPidTag = "TracerPid:";
+
+                    for (std::string line; std::getline(status, line); ) {
+                        if (line.starts_with(TracerPidTag)) {
+                            line = line.substr(TracerPidTag.size());
+
+                            for (char character : line)
+                                if (std::isspace(character))
+                                    continue;
+                                else
+                                    return character != '0';
+
+                            return false;
+                        }
+                    }
+
+                    return false;
+                }()};
+
+                if (RunningUnderDebugger)
+                    raise(SIGTRAP); // Notify the debugger if we've got a SIGSEGV as the debugger doesn't catch them by default as they might be hooked
+            }
+
             signal::ExceptionalSignalHandler(signal, info, ctx); //!< Delegate throwing a host exception to the exceptional signal handler
         }
     }

app/src/main/cpp/skyline/soc/gm20b/engines/gpfifo.cpp

@@ -1,8 +1,6 @@
 // SPDX-License-Identifier: MPL-2.0
 // Copyright © 2021 Skyline Team and Contributors (https://github.com/skyline-emu/)
 
-#pragma once
-
 #include <soc.h>
 #include <soc/gm20b/channel.h>
 #include "gpfifo.h"

app/src/main/java/emu/skyline/EmulationActivity.kt

@@ -29,6 +29,12 @@ import kotlin.math.abs
 class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTouchListener {
     companion object {
         private val Tag = EmulationActivity::class.java.simpleName
+        val ReturnToMainTag = "returnToMain"
+
+        /**
+         * The Kotlin thread on which emulation code executes
+         */
+        private var emulationThread : Thread? = null
     }
 
     init {
@@ -43,15 +49,15 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
     private var vibrators = HashMap<Int, Vibrator>()
 
     /**
-     * A boolean flag denoting if the emulation thread should call finish() or not
+     * If the emulation thread should call [returnToMain] or not
      */
     @Volatile
     private var shouldFinish : Boolean = true
 
     /**
-     * The Kotlin thread on which emulation code executes
+     * If the activity should return to [MainActivity] or just call [finishAndRemoveTask]
      */
-    private lateinit var emulationThread : Thread
+    var returnToMain : Boolean = false
 
     @Inject
     lateinit var settings : Settings
@@ -72,9 +78,10 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
     private external fun executeApplication(romUri : String, romType : Int, romFd : Int, preferenceFd : Int, language : Int, appFilesPath : String, assetManager : AssetManager)
 
     /**
-     * @return If it successfully caused the [emulationThread] to gracefully stop
+     * @param join If the function should only return after all the threads join or immediately
+     * @return If it successfully caused [emulationThread] to gracefully stop or do so asynchronously when not joined
      */
-    private external fun stopEmulation() : Boolean
+    private external fun stopEmulation(join : Boolean) : Boolean
 
     /**
      * This sets the surface object in libskyline to the provided value, emulation is halted if set to null
@@ -84,12 +91,17 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
      */
     private external fun setSurface(surface : Surface?) : Boolean
 
+    /**
+     * @param play If the audio should be playing or be stopped till it is resumed by calling this again
+     */
+    private external fun changeAudioStatus(play : Boolean)
+
     var fps : Int = 0
     var averageFrametime : Float = 0.0f
     var averageFrametimeDeviation : Float = 0.0f
 
     /**
-     * Writes the current performance statistics into [fps] and [frametime] fields
+     * Writes the current performance statistics into [fps], [averageFrametime] and [averageFrametimeDeviation] fields
      */
     private external fun updatePerformanceStatistics()
 
@@ -162,25 +174,55 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
     }
 
     /**
-     * This executes the specified ROM
+     * Return from emulation to either [MainActivity] or the activity on the back stack
-     *
-     * @param rom The URI of the ROM to execute
      */
-    private fun executeApplication(rom : Uri) {
+    fun returnFromEmulation() {
+        if (shouldFinish) {
+            runOnUiThread {
+                if (shouldFinish) {
+                    shouldFinish = false
+                    if (returnToMain)
+                        startActivity(Intent(applicationContext, MainActivity::class.java).setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
+                    finishAndRemoveTask()
+                }
+            }
+        }
+    }
+
+    /**
+     * @note Any caller has to handle the application potentially being restarted with the supplied intent
+     */
+    private fun executeApplication(intent : Intent) {
+        if (emulationThread?.isAlive == true) {
+            shouldFinish = false
+            if (stopEmulation(false))
+                emulationThread!!.join(250)
+
+            if (emulationThread!!.isAlive) {
+                finishAndRemoveTask()
+                startActivity(intent)
+                Runtime.getRuntime().exit(0)
+            }
+        }
+
+        shouldFinish = true
+        returnToMain = intent.getBooleanExtra(ReturnToMainTag, false)
+
+        val rom = intent.data!!
         val romType = getRomFormat(rom, contentResolver).ordinal
         val romFd = contentResolver.openFileDescriptor(rom, "r")!!
         val preferenceFd = ParcelFileDescriptor.open(File("${applicationInfo.dataDir}/shared_prefs/${applicationInfo.packageName}_preferences.xml"), ParcelFileDescriptor.MODE_READ_WRITE)
 
         emulationThread = Thread {
             executeApplication(rom.toString(), romType, romFd.detachFd(), preferenceFd.detachFd(), settings.systemLanguage, applicationContext.filesDir.canonicalPath + "/", assets)
-            if (shouldFinish)
+            returnFromEmulation()
-                runOnUiThread {
-                    emulationThread.join()
-                    finish()
-                }
         }
 
-        emulationThread.start()
+        emulationThread!!.start()
+    }
+
+    override fun onBackPressed() {
+        returnFromEmulation()
     }
 
     /**
@@ -235,12 +277,20 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
             setOnClickListener { binding.onScreenControllerView.isInvisible = !binding.onScreenControllerView.isInvisible }
         }
 
-        executeApplication(intent.data!!)
+        executeApplication(intent!!)
+    }
+
+    override fun onPause() {
+        super.onPause()
+
+        changeAudioStatus(false)
     }
 
     override fun onResume() {
         super.onResume()
 
+        changeAudioStatus(true)
+
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
             @Suppress("DEPRECATION")
             window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
@@ -253,38 +303,26 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
     }
 
     /**
-     * This is used to stop the currently executing ROM and replace it with the one specified in the new intent
+     * Stop the currently executing ROM and replace it with the one specified in the new intent
      */
     override fun onNewIntent(intent : Intent?) {
-        super.onNewIntent(intent)
+        super.onNewIntent(intent!!)
-        shouldFinish = false
+        setIntent(intent)
-
+        executeApplication(intent)
-        while (emulationThread.isAlive)
-            if (stopEmulation())
-                emulationThread.join()
-
-        vibrators.forEach { (_, vibrator) -> vibrator.cancel() }
-
-        shouldFinish = true
-
-        executeApplication(intent?.data!!)
     }
 
     override fun onDestroy() {
         super.onDestroy()
         shouldFinish = false
 
-        while (emulationThread.isAlive)
+        stopEmulation(false)
-            if (stopEmulation())
-                emulationThread.join()
-
         vibrators.forEach { (_, vibrator) -> vibrator.cancel() }
         vibrators.clear()
     }
 
     override fun surfaceCreated(holder : SurfaceHolder) {
         Log.d(Tag, "surfaceCreated Holder: $holder")
-        while (emulationThread.isAlive)
+        while (emulationThread!!.isAlive)
             if (setSurface(holder.surface))
                 return
     }
@@ -298,7 +336,7 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
 
     override fun surfaceDestroyed(holder : SurfaceHolder) {
         Log.d(Tag, "surfaceDestroyed Holder: $holder")
-        while (emulationThread.isAlive)
+        while (emulationThread!!.isAlive)
             if (setSurface(null))
                 return
     }

app/src/main/java/emu/skyline/MainActivity.kt

@@ -278,10 +278,11 @@ class MainActivity : AppCompatActivity() {
     private fun selectStartGame(appItem : AppItem) {
         if (binding.swipeRefreshLayout.isRefreshing) return
 
-        if (settings.selectAction)
+        if (settings.selectAction) {
             AppDialog.newInstance(appItem).show(supportFragmentManager, "game")
-        else if (appItem.loaderResult == LoaderResult.Success)
+        } else if (appItem.loaderResult == LoaderResult.Success) {
-            startActivity(Intent(this, EmulationActivity::class.java).apply { data = appItem.uri })
+            startActivity(Intent(this, EmulationActivity::class.java).apply { data = appItem.uri; putExtra(EmulationActivity.ReturnToMainTag, true) })
+        }
     }
 
     private fun selectShowGameDialog(appItem : AppItem) {

app/src/main/java/emu/skyline/preference/CustomEditTextPreference.kt

@@ -13,7 +13,7 @@ import androidx.preference.EditTextPreference
 import emu.skyline.R
 
 /**
- * This class adapts [EditTextPreference] so that it supports setting the value as the summary automatically. Also added useful attributes.
+ * This class adapts [EditTextPreference] so that it supports setting the value as the summary automatically and adds useful attributes
  */
 class CustomEditTextPreference @JvmOverloads constructor(context : Context, attrs : AttributeSet? = null, defStyleAttr : Int = androidx.preference.R.attr.editTextPreferenceStyle) : EditTextPreference(context, attrs, defStyleAttr) {
     init {

app/src/main/res/values/array.xml

@@ -35,23 +35,43 @@
         <item>2</item>
     </string-array>
     <string-array name="system_languages">
-        <item>Japanese (日本語)</item>
+        <item>American English</item>
-        <item>English</item>
-        <item>French (français)</item>
-        <item>German (Deutsch)</item>
-        <item>Italian (italiano)</item>
-        <item>Spanish (español)</item>
-        <item>Chinese</item>
-        <item>Korean (한국어)</item>
-        <item>Dutch (Nederlands)</item>
-        <item>Portuguese (português)</item>
-        <item>Russian (Русский)</item>
-        <item>Taiwanese</item>
         <item>British English</item>
-        <item>Canadian English</item>
+        <item>Français (French)</item>
-        <item>Latin American Spanish</item>
+        <item>Français Canadien (Canadian French)</item>
-        <item>Simplified Chinese</item>
+        <item>Deutsch (German)</item>
-        <item>Traditional Chinese (正體中文)</item>
+        <item>Español (Spanish)</item>
-        <item>Brazilian Portuguese (português do Brasil)</item>
+        <item>Español Latinoamericano (Latin American Spanish)</item>
+        <item>Italiano (Italian)</item>
+        <item>Nederlands (Dutch)</item>
+        <item>Português (Portuguese)</item>
+        <item>Português do Brasil (Brazilian Portuguese)</item>
+        <item>Русский (Russian)</item>
+        <item>日本語 (Japanese)</item>
+        <item>汉语 (Chinese)</item>
+        <item>繁體中文 (Traditional Chinese)</item>
+        <item>简体中文 (Simplified Chinese)</item>
+        <item>한국어 (Korean)</item>
+        <item>臺語 (Taiwanese)</item>
     </string-array>
+    <integer-array name="system_languages_val">
+        <item>1</item>
+        <item>12</item>
+        <item>2</item>
+        <item>13</item>
+        <item>3</item>
+        <item>5</item>
+        <item>14</item>
+        <item>4</item>
+        <item>8</item>
+        <item>9</item>
+        <item>17</item>
+        <item>10</item>
+        <item>0</item>
+        <item>6</item>
+        <item>16</item>
+        <item>15</item>
+        <item>7</item>
+        <item>11</item>
+    </integer-array>
 </resources>

app/src/main/res/values/themes.xml

@@ -16,6 +16,7 @@
     <style name="AppTheme" parent="BaseAppTheme">
         <item name="android:windowLightNavigationBar" tools:targetApi="o_mr1">true</item>
         <item name="android:windowLightStatusBar">true</item>
+        <item name="android:alertDialogTheme">@style/ThemeOverlay.MaterialComponents.MaterialAlertDialog</item>
     </style>
 
     <style name="ToolbarTheme" parent="AppTheme">

app/src/main/res/xml/preferences.xml

@@ -75,6 +75,7 @@
         <emu.skyline.preference.IntegerListPreference
             android:defaultValue="1"
             android:entries="@array/system_languages"
+            android:entryValues="@array/system_languages_val"
             app:key="system_language"
             app:title="@string/system_language"
             app:refreshRequired="true"