few more comments

src/main.cpp

@@ -81,17 +81,25 @@ class VulkanApp {
   }
 
  private:
+  // GLFW instance
   vkfw::UniqueInstance mVKFWInstance;
-  vkfw::UniqueWindow   mWindow;
+  // GLFW window
+  vkfw::UniqueWindow mWindow;
 
+  // Vulkan instance
   vk::UniqueInstance mInstance;
 
+  // Debug messenger
   vk::UniqueDebugUtilsMessengerEXT mDebugMessenger;
-  vk::UniqueSurfaceKHR             mSurface;
+  // Window surface
+  vk::UniqueSurfaceKHR mSurface;
 
-  vk::PhysicalDevice      mPhysicalDevice;
+  // Represents the physical device
+  vk::PhysicalDevice mPhysicalDevice;
+  // Number of MSAA samples
   vk::SampleCountFlagBits mMsaaSamples;
-  vk::UniqueDevice        mDevice;
+  // Represents the logical device
+  vk::UniqueDevice mDevice;
 
   vk::Queue mGraphicsQueue;
   vk::Queue mPresentQueue;