Fix : Added prerequisite checks for using VK_Layer_Validation

@@ -83,0 +83,4 @@
+{
+  const char *ev_val = getenv("VK_LAYER_PATH");
+  bool exists = false;
+  if (ev_val != nullptr) {

@@ -83,0 +84,4 @@
+  const char *ev_val = getenv("VK_LAYER_PATH");
+  bool exists = false;
+  if (ev_val != nullptr) {
+    std::string _json = std::string(ev_val) +  "/VkLayer_khronos_validation.json";

@@ -83,0 +85,4 @@
+  bool exists = false;
+  if (ev_val != nullptr) {
+    std::string _json = std::string(ev_val) +  "/VkLayer_khronos_validation.json";
+    std::ifstream infile(_json.c_str());

@@ -83,0 +90,4 @@
+  }
+  if (!exists) {
+#if defined(_WIN32)
+    fprintf(stderr,

@@ -83,0 +95,4 @@
+            "\n  Set the path ..VulkanSDK\1.2.198.1\Bin of VulkanSDK (version1.2.198.1) to the "
+            "environment variable VK_LAYER_PATH.\nSee more details "
+            "https://vulkan.lunarg.com/doc/sdk/1.3.239.0/windows/layer_configuration.html.");
+#elif !defined(__APPLE__)

@@ -83,0 +99,4 @@
+    fprintf(stderr,
+            "Warning: Layer requested, we are trying to use the VulkanValidationLayer explicitly. "
+            "\n  Set the path ..vulkan/explicit_layer.d of VulkanSDK (version1.2.198.1) to the "
+            "environment variable VK_LAYER_PATH.\n"See more details https://vulkan.lunarg.com/doc/sdk/1.3.239.0/linux/layer_configuration.html.");

@@ -83,0 +83,4 @@
+{
+  const char *ev_val = getenv("VK_LAYER_PATH");
+  bool exists = false;
+  if (ev_val != nullptr) {

@@ -83,0 +90,4 @@
+  }
+  if (!exists) {
+#if defined(_WIN32)
+    fprintf(stderr,

@@ -24,3 +24,3 @@
 #include <cstring>
 #include <iostream>
-
+#include "sys/stat.h"

@@ -80,3 +80,3 @@
   }
 }
-
+static bool is_vklayer_exist(const char* vk_extension_config)

@@ -83,0 +85,4 @@
+  if (ev_val == nullptr) {
+    return false;
+  }
+  const size_t size_max =  strlen(ev_val) +  strlen(vk_extension_config) + 2;

@@ -865,3 +881,3 @@
   vector<const char *> layers_enabled;
   if (m_debug) {
-    enableLayer(layers_available, layers_enabled, "VK_LAYER_KHRONOS_validation", m_debug);
+    if (is_vklayer_exist("VkLayer_khronos_validation.json")) {

@@ -102,6 +116,10 @@ static const char *vulkan_error_as_string(VkResult result)
 
 /* Triple buffering. */
 const int MAX_FRAMES_IN_FLIGHT = 2;
+enum class VkDynamicLibraryType : std::uint8_t {

@@ -104,1 +118,4 @@
 const int MAX_FRAMES_IN_FLIGHT = 2;
+enum class VkDynamicLibraryType : std::uint8_t {
+  VkValidationLayer = 0,
+  VkDynamicLibraryAll

@@ -409,0 +434,4 @@
+      return;
+ }
+
+  if (checkLayerSupport(layers_available, "VK_LAYER_KHRONOS_validation") &&

@@ -19,10 +19,12 @@
 
 #include <vector>
 
+#include <sys/stat.h>

@@ -413,0 +425,4 @@
+        vklayer_config_exist("VkLayer_khronos_validation.json")) {
+        layers_enabled.push_back(layer_name);
+    }
+    else if (warning) {