fix bug and add log

vulkan/Application.h

@@ -81,6 +81,17 @@ public:
     bool _applicationInited = false;
     void cleanupSecondInit();
 
+    // Tear down only the window-dependent Vulkan objects so we can survive an
+    // Android APP_CMD_TERM_WINDOW (screen off / background / rotate).
+    // Keeps renderPass / pipelines / VMA / textures / FaceApp resources intact,
+    // so pipelines created by FaceApp remain valid for the new swapchain.
+    // Caller MUST hold any app-level mutexes that serialize JNI -> Vulkan access.
+    void cleanupForWindowLost();
+
+    // Rebuild the window-dependent Vulkan objects torn down above.
+    // Safe to call only after cleanupForWindowLost().
+    void reinitForNewWindow();
+
 protected:
     void loadTexture(std::string path, Texture& tex, bool srgb, VkCommandPool pool);
     void loadTexture(std::vector<unsigned char>& image_data, size_t image_size, int w, int h, Texture& tex, bool srgb, VkCommandPool pool, std::string path);