From 1a2c31ab41fb6f6684526284da2814d308ac5c82 Mon Sep 17 00:00:00 2001
From: IlyaShurupov <ilusha@workspace.com>
Date: Thu, 7 Nov 2024 17:27:46 +0300
Subject: [PATCH] add validation layers

---
 main.cpp | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/main.cpp b/main.cpp
index 32b8497..5d00ea5 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,9 +1,19 @@
 #define GLFW_INCLUDE_VULKAN
+
+#include <cstring>
 #include "GLFW/glfw3.h"
 
 #include "iostream"
 #include "stdexcept"
 #include "cstdlib"
+#include "vector"
+
+const std::vector<const char*> validationLayers = {
+#ifdef NDEBUG
+#else
+    "VK_LAYER_KHRONOS_validation"
+#endif
+};
 
 class Application {
 public:
@@ -25,6 +35,7 @@ private:
 
   void initVulkan() {
     createInstance();
+    // pickPhysicalDevice();
   }
 
   void mainLoop() {
@@ -41,6 +52,10 @@ private:
 
 
   void createInstance() {
+    if (!checkValidationLayerSupport()) {
+      throw std::runtime_error("no required validation layers present");
+    }
+
     uint32_t glfwExtensionCount = 0;
     const char** glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);
 
@@ -56,7 +71,8 @@ private:
     VkInstanceCreateInfo createInfo {
       .sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO,
       .pApplicationInfo = &appInfo,
-      .enabledLayerCount = 0,
+      .enabledLayerCount = (uint32_t) validationLayers.size(),
+      .ppEnabledLayerNames = validationLayers.data(),
       .enabledExtensionCount = glfwExtensionCount,
       .ppEnabledExtensionNames = glfwExtensions,
     };
@@ -66,6 +82,28 @@ private:
     }
   }
 
+  static bool checkValidationLayerSupport() {
+    uint32_t layerCount;
+    vkEnumerateInstanceLayerProperties(&layerCount, nullptr);
+
+    std::vector<VkLayerProperties> availableLayers(layerCount);
+    vkEnumerateInstanceLayerProperties(&layerCount, availableLayers.data());
+
+    for (const auto& requestedLayer : validationLayers) {
+      bool presents = false;
+      for (auto &layer: availableLayers) {
+        if (strcmp(requestedLayer, layer.layerName) == 0) {
+          presents = true;
+          break;
+        }
+      }
+
+      if (!presents) return false;
+    }
+
+    return true;
+  }
+
 private:
   GLFWwindow* window = nullptr;
   VkInstance instance {};