Updated to the next chapter of vkguide https://vkguide.dev/docs/new_chapter_2/vulkan_shader_drawing/

vk_engine.h

@@ -5,12 +5,30 @@
 
 #include <vk_types.h>
 
+struct DeletionQueue {
+  std::deque<std::function<void()>> deletors;
+
+  void push_function(std::function<void()>&& function) {
+    deletors.push_back(function);
+  }
+
+  void flush() {
+    // reverse itererate the deletion queue
+    for(auto it = deletors.rbegin(); it != deletors.rend(); it++) {
+      (*it)();
+    }
+
+    deletors.clear();
+  }
+};
+
 struct FrameData {
   VkCommandPool _commandPool;
   VkCommandBuffer _mainCommandBuffer;
   VkSemaphore _swapchainSemaphore;
   VkSemaphore _renderSemaphore;
   VkFence _renderFence;
+  DeletionQueue _deletionQueue;
 };
 
 constexpr unsigned int FRAME_OVERLAP=2;
@@ -32,6 +50,9 @@ public:
   std::vector<VkImageView> _swapchainImageViews;
   VkExtent2D _swapchainExtent;
 
+  // VMA stuff
+  VmaAllocator _allocator;
+
   // frames/command buffer
   unsigned int _frameNumber = 0;
   FrameData _frames[FRAME_OVERLAP];
@@ -43,12 +64,15 @@ public:
   VkQueue _graphicsQueue;
   uint32_t _graphicsQueueFamily;
 
+  // draw resources
+  AllocatedImage _drawImage;
+  VkExtent2D _drawExtent;
+
   // internal data
   bool _isInitialized{ false };
-
   VkExtent2D _windowExtent{ 1700 , 900 };
-
   struct SDL_Window* _window{ nullptr };
+  DeletionQueue _mainDeletionQueue;
 
   static VulkanEngine& Get();
 
@@ -72,4 +96,5 @@ private:
 
   void create_swapchain(uint32_t width, uint32_t height);
   void destroy_swapchain();
+  void draw_background(VkCommandBuffer cmd);
 };