Ported GPUCode's Android Vulkan stability fixes

Thanks!

src/android/app/src/main/java/io/github/lime3ds/android/activities/EmulationActivity.kt

@@ -85,10 +85,6 @@ class EmulationActivity : AppCompatActivity() {
             windowManager.defaultDisplay.rotation
         )
 
-        // Start a foreground service to prevent the app from getting killed in the background
-        foregroundService = Intent(this, ForegroundService::class.java)
-        startForegroundService(foregroundService)
-
         EmulationLifecycleUtil.addShutdownHook(hook = { this.finish() })
     }
 
@@ -112,7 +108,6 @@ class EmulationActivity : AppCompatActivity() {
 
     override fun onDestroy() {
         EmulationLifecycleUtil.clear()
-        stopForegroundService(this)
         super.onDestroy()
     }
 

src/android/app/src/main/jni/emu_window/emu_window.cpp

@@ -27,7 +27,11 @@ static void UpdateLandscapeScreenLayout() {
             IDCache::GetNativeLibraryClass(), IDCache::GetLandscapeScreenLayout()));
 }
 
-void EmuWindow_Android::OnSurfaceChanged(ANativeWindow* surface) {
+bool EmuWindow_Android::OnSurfaceChanged(ANativeWindow* surface) {
+    if (render_window == surface) {
+        return false;
+    }
+
     render_window = surface;
 
     window_info.type = Frontend::WindowSystemType::Android;
@@ -35,6 +39,8 @@ void EmuWindow_Android::OnSurfaceChanged(ANativeWindow* surface) {
 
     StopPresenting();
     OnFramebufferSizeChanged();
+
+    return true;
 }
 
 bool EmuWindow_Android::OnTouchEvent(int x, int y, bool pressed) {

src/android/app/src/main/jni/emu_window/emu_window.h

@@ -17,7 +17,7 @@ public:
     ~EmuWindow_Android();
 
     /// Called by the onSurfaceChanges() method to change the surface
-    void OnSurfaceChanged(ANativeWindow* surface);
+    bool OnSurfaceChanged(ANativeWindow* surface);
 
     /// Handles touch event that occur.(Touched or released)
     bool OnTouchEvent(int x, int y, bool pressed);

src/android/app/src/main/jni/native.cpp

@@ -289,12 +289,13 @@ void Java_io_github_lime3ds_android_NativeLibrary_surfaceChanged(JNIEnv* env,
                                                                  jobject surf) {
     s_surf = ANativeWindow_fromSurface(env, surf);
 
+    bool notify = false;
     if (window) {
-        window->OnSurfaceChanged(s_surf);
+        notify = window->OnSurfaceChanged(s_surf);
     }
 
     auto& system = Core::System::GetInstance();
-    if (system.IsPoweredOn()) {
+    if (notify && system.IsPoweredOn()) {
         system.GPU().Renderer().NotifySurfaceChanged();
     }
 

src/video_core/renderer_vulkan/vk_pipeline_cache.cpp

@@ -82,7 +82,7 @@ constexpr std::array<vk::DescriptorSetLayoutBinding, 7> SHADOW_BINDINGS = {{
 PipelineCache::PipelineCache(const Instance& instance_, Scheduler& scheduler_,
                              RenderpassCache& renderpass_cache_, DescriptorPool& pool_)
     : instance{instance_}, scheduler{scheduler_}, renderpass_cache{renderpass_cache_}, pool{pool_},
-      num_worker_threads{std::max(std::thread::hardware_concurrency(), 2U)},
+      num_worker_threads{std::max(std::thread::hardware_concurrency() >> 1, 2U)},
       workers{num_worker_threads, "Pipeline workers"},
       descriptor_set_providers{DescriptorSetProvider{instance, pool, BUFFER_BINDINGS},
                                DescriptorSetProvider{instance, pool, TEXTURE_BINDINGS},

src/video_core/renderer_vulkan/vk_present_window.cpp

@@ -473,7 +473,7 @@ void PresentWindow::CopyToSwapchain(Frame* frame) {
         .pSignalSemaphores = &present_ready,
     };
 
-    std::scoped_lock submit_lock{scheduler.submit_mutex};
+    std::scoped_lock submit_lock{scheduler.submit_mutex, recreate_surface_mutex};
 
     try {
         graphics_queue.submit(submit_info, frame->present_done);

src/video_core/renderer_vulkan/vk_swapchain.cpp

@@ -78,9 +78,13 @@ void Swapchain::Create(u32 width_, u32 height_, vk::SurfaceKHR surface_) {
 }
 
 bool Swapchain::AcquireNextImage() {
+    if (needs_recreation) {
+        return false;
+    }
+
     MICROPROFILE_SCOPE(Vulkan_Acquire);
-    vk::Device device = instance.GetDevice();
-    vk::Result result =
+    const vk::Device device = instance.GetDevice();
+    const vk::Result result =
         device.acquireNextImageKHR(swapchain, std::numeric_limits<u64>::max(),
                                    image_acquired[frame_index], VK_NULL_HANDLE, &image_index);
 
@@ -102,10 +106,6 @@ bool Swapchain::AcquireNextImage() {
 }
 
 void Swapchain::Present() {
-    if (needs_recreation) {
-        return;
-    }
-
     const vk::PresentInfoKHR present_info = {
         .waitSemaphoreCount = 1,
         .pWaitSemaphores = &present_ready[image_index],
@@ -119,6 +119,10 @@ void Swapchain::Present() {
         [[maybe_unused]] vk::Result result = instance.GetPresentQueue().presentKHR(present_info);
     } catch (vk::OutOfDateKHRError&) {
         needs_recreation = true;
+        return;
+    } catch (vk::SurfaceLostKHRError&) {
+        needs_recreation = true;
+        return;
     } catch (const vk::SystemError& err) {
         LOG_CRITICAL(Render_Vulkan, "Swapchain presentation failed {}", err.what());
         UNREACHABLE();