Finished validation layer stuffs

.clang-format

@@ -9,7 +9,7 @@ AllowShortLoopsOnASingleLine: true
 BasedOnStyle: Chromium
 BinPackArguments: false
 BinPackParameters: false
-ColumnLimit: 100
+ColumnLimit: 110
 ConstructorInitializerIndentWidth: 2
 ContinuationIndentWidth: 2
 Cpp11BracedListStyle: false

.envrc

@@ -1 +1,2 @@
-use_flake
+export NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1
+use_flake . --impure

flake.nix

@@ -111,6 +111,9 @@
               ]
               ++ deps;
 
+            VULKAN_SDK = "${vulkan-headers}";
+            VK_LAYER_PATH = "${vulkan-validation-layers}/share/vulkan/explicit_layer.d";
+
             shellHook = ''
               export PATH="${llvmPackages_18.clang-tools.override {enableLibcxx = true;}}/bin:$PATH"
             '';

src/main.cpp

@@ -1,11 +1,14 @@
 #include <cstdlib>
 #include <fmt/format.h>
 #include <iostream>
+#include <span>
+#include <vulkan/vulkan_core.h>
 
 #define GLFW_INCLUDE_NONE
 #define GLFW_INCLUDE_VULKAN
 #include <GLFW/glfw3.h>
 
+#include "util/magic_enum.hpp"
 #include "util/types.h"
 
 constexpr u32 WIDTH  = 800;
@@ -19,6 +22,35 @@ const bool enableValidationLayers = false;
 const bool enableValidationLayers = true;
 #endif
 
+fn CreateDebugUtilsMessengerEXT(
+  VkInstance                                instance,
+  const VkDebugUtilsMessengerCreateInfoEXT* pCreateInfo,
+  const VkAllocationCallbacks*              pAllocator,
+  VkDebugUtilsMessengerEXT*                 pDebugMessenger
+) -> VkResult {
+  auto func = std::bit_cast<PFN_vkCreateDebugUtilsMessengerEXT>(
+    vkGetInstanceProcAddr(instance, "vkCreateDebugUtilsMessengerEXT")
+  );
+
+  if (func == nullptr)
+    return VK_ERROR_EXTENSION_NOT_PRESENT;
+
+  return func(instance, pCreateInfo, pAllocator, pDebugMessenger);
+}
+
+fn DestroyDebugUtilsMessengerEXT(
+  VkInstance                   instance,
+  VkDebugUtilsMessengerEXT     debugMessenger,
+  const VkAllocationCallbacks* pAllocator
+) -> void {
+  auto func = std::bit_cast<PFN_vkDestroyDebugUtilsMessengerEXT>(
+    vkGetInstanceProcAddr(instance, "vkDestroyDebugUtilsMessengerEXT")
+  );
+
+  if (func != nullptr)
+    func(instance, debugMessenger, pAllocator);
+}
+
 class Application {
  public:
   fn run() -> void {
@@ -29,6 +61,7 @@ class Application {
   }
 
  private:
+  VkDebugUtilsMessengerEXT mDebugMessenger;
   VkInstance               mInstance;
   GLFWwindow*              mWindow;
 
@@ -44,8 +77,7 @@ class Application {
 
       for (const auto& layerProperties : availableLayers) {
         if (strcmp(
-              static_cast<const char*>(layerName),
-              static_cast<const char*>(layerProperties.layerName)
+              static_cast<const char*>(layerName), static_cast<const char*>(layerProperties.layerName)
             ) == 0) {
           layerFound = true;
           break;
@@ -69,10 +101,49 @@ class Application {
     return extensions;
   }
 
+  static fn getRequiredExtensions() -> std::vector<const char*> {
+    u32          glfwExtensionCount = 0;
+    const char** glfwExtensions     = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);
+
+    std::vector<const char*> extensions;
+
+    if (glfwExtensions) {
+      std::span<const char*> extSpan(glfwExtensions, glfwExtensionCount);
+      extensions.assign(extSpan.begin(), extSpan.end());
+    }
+
+    if (enableValidationLayers)
+      extensions.push_back(VK_EXT_DEBUG_UTILS_EXTENSION_NAME);
+
+    return extensions;
+  }
+
+  static VKAPI_ATTR fn VKAPI_CALL debugCallback(
+    // Severity - verbose, info, warning, error
+    VkDebugUtilsMessageSeverityFlagBitsEXT /*messageSeverity*/,
+
+    // Message Type - general, validation, performance
+    VkDebugUtilsMessageTypeFlagsEXT /*messageType*/,
+
+    // Callback Data - Contains details of the message
+    // * pMessage    - The message as a null-terminated string
+    // * pObjects    - Array of related objects
+    // * objectCount - Number of related objects
+    const VkDebugUtilsMessengerCallbackDataEXT* pCallbackData,
+
+    // User Data - Any extra data the user may want to pass to the function
+    void* /*pUserData*/
+  ) -> VkBool32 /* If true, abort the call */ {
+    std::cerr << "validation layer: " << pCallbackData->pMessage << std::endl;
+
+    return VK_FALSE;
+  }
+
   fn createInstance() -> void {
     if (enableValidationLayers && !checkValidationLayerSupport())
       throw std::runtime_error("Validation layers requested, but not available!");
 
+    // General Metadata
     VkApplicationInfo appInfo {};
     appInfo.sType              = VK_STRUCTURE_TYPE_APPLICATION_INFO; // Used for pNext
     appInfo.pApplicationName   = "Hello Triangle";
@@ -81,33 +152,38 @@ class Application {
     appInfo.engineVersion      = VK_MAKE_VERSION(1, 0, 0);
     appInfo.apiVersion         = VK_API_VERSION_1_0;
 
-    uint32_t     glfwExtensionCount = 0;
-    const char** glfwExtensions     = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);
-
+    // Information used by vkCreateInstance
     VkInstanceCreateInfo createInfo {};
     createInfo.sType            = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
     createInfo.pApplicationInfo = &appInfo;
-    createInfo.enabledExtensionCount   = glfwExtensionCount;
-    createInfo.ppEnabledExtensionNames = glfwExtensions;
+
+    VkDebugUtilsMessengerCreateInfoEXT debugCreateInfo {};
 
     if (enableValidationLayers) {
       createInfo.enabledLayerCount   = static_cast<uint32_t>(validationLayers.size());
       createInfo.ppEnabledLayerNames = validationLayers.data();
+
+      populateDebugMessengerCreateInfo(debugCreateInfo);
+      createInfo.pNext = (VkDebugUtilsMessengerCreateInfoEXT*)&debugCreateInfo;
     } else {
       createInfo.enabledLayerCount = 0;
+
+      createInfo.pNext = nullptr;
     }
 
-    std::vector<const char*> requiredExtensions;
-
-    requiredExtensions.emplace_back(VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME);
+    // Fixes macOS crashes
+    std::vector<const char*> extensions = getRequiredExtensions();
+    extensions.emplace_back(VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME);
 
     createInfo.flags |= VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR;
+    createInfo.enabledExtensionCount   = static_cast<u32>(extensions.size());
+    createInfo.ppEnabledExtensionNames = extensions.data();
 
-    createInfo.enabledExtensionCount   = static_cast<u32>(requiredExtensions.size());
-    createInfo.ppEnabledExtensionNames = requiredExtensions.data();
-
-    if (vkCreateInstance(&createInfo, nullptr, &mInstance) != VK_SUCCESS)
-      throw std::runtime_error("failed to create instance!");
+    // Finally, create the instance (and throw an error if it fails)
+    if (auto result = vkCreateInstance(&createInfo, nullptr, &mInstance); result != VK_SUCCESS)
+      throw std::runtime_error(
+        string("Failed to create instance! Error: ") + string(magic_enum::enum_name(result))
+      );
   }
 
   fn initWindow() -> void {
@@ -123,13 +199,43 @@ class Application {
     mWindow = glfwCreateWindow(WIDTH, HEIGHT, "Vulkan", nullptr, nullptr);
   }
 
-  fn initVulkan() -> void { createInstance(); }
+  fn initVulkan() -> void {
+    createInstance();
+    setupDebugMessenger();
+  }
+
+  static fn populateDebugMessengerCreateInfo(VkDebugUtilsMessengerCreateInfoEXT& createInfo) -> void {
+    createInfo                 = {};
+    createInfo.sType           = VK_STRUCTURE_TYPE_DEBUG_UTILS_MESSENGER_CREATE_INFO_EXT;
+    createInfo.messageSeverity = VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT |
+                                 VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT |
+                                 VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT;
+    createInfo.messageType = VK_DEBUG_UTILS_MESSAGE_TYPE_GENERAL_BIT_EXT |
+                             VK_DEBUG_UTILS_MESSAGE_TYPE_VALIDATION_BIT_EXT |
+                             VK_DEBUG_UTILS_MESSAGE_TYPE_PERFORMANCE_BIT_EXT;
+    createInfo.pfnUserCallback = debugCallback;
+  }
+
+  fn setupDebugMessenger() -> void {
+    if (!enableValidationLayers)
+      return;
+
+    VkDebugUtilsMessengerCreateInfoEXT createInfo;
+    populateDebugMessengerCreateInfo(createInfo);
+
+    if (CreateDebugUtilsMessengerEXT(mInstance, &createInfo, nullptr, &mDebugMessenger) != VK_SUCCESS) {
+      throw std::runtime_error("Failed to set up debug messenger!");
+    }
+  }
 
   fn mainLoop() -> void {
     while (!glfwWindowShouldClose(mWindow)) glfwPollEvents();
   }
 
   fn cleanup() -> void {
+    if (enableValidationLayers)
+      DestroyDebugUtilsMessengerEXT(mInstance, mDebugMessenger, nullptr);
+
     vkDestroyInstance(mInstance, nullptr);
     glfwDestroyWindow(mWindow);
     glfwTerminate();