Feature/VkExtensions+VkLayers (#2)

src/Engine.hpp

@@ -1,6 +1,9 @@
 
 #pragma once
 
+// resource allocation is initializion my beloved
+#include <vulkan/vulkan_raii.hpp>
+
 #include "Window.hpp"
 
 class Engine {
@@ -10,6 +13,7 @@ public:
     Engine(Window* window);
     ~Engine() = default;
 
+    // initializes and sets up the vulkan instance. outside of constructor to allow control of order the order of initialization
     void init();
     
     // draw is called every render iteration in that while loop
@@ -17,8 +21,30 @@ public:
 
 private:
 
-    // might get rid of this
+    // returns a list of the required extensions needed by our engine
+    std::vector<const char*> getRequiredInstanceExtensions();
+
+    // helper for organizing the creation of the vulkan instance. returns success or failure
+    bool createInstance();
+
+    // helper for attaching callbacks to the instance
+    bool initDebugMessenger();
+
+    // callback function for the vulkan debug extension: routes debug messages from validation layers to our app
+    static VKAPI_ATTR vk::Bool32 VKAPI_CALL debugCallback(vk::DebugUtilsMessageSeverityFlagBitsEXT severity,
+                                                          vk::DebugUtilsMessageTypeFlagsEXT type,
+                                                          const vk::DebugUtilsMessengerCallbackDataEXT* pCallbackData,
+                                                          void* pUserData);
 
     Window* window_;
 
+    // Vulkan specific instance members
+    vk::raii::Context context_;
+    vk::raii::Instance instance_ = nullptr;
+    vk::raii::DebugUtilsMessengerEXT debugMessenger_ = nullptr;
+
+    // members for control over validation layers
+    static constexpr bool enableValidationLayers = true; // TODO: only true in debug mode
+    const std::vector<const char*> validationLayers = { "VK_LAYER_KHRONOS_validation" };
+
 };