Resolve "Context Functionality"

Closes #7 (closed)

src/vkcv/Context.cpp

 #include "Context.hpp"
-
+#include "CoreManager.hpp"
 
 namespace vkcv {
 
@@ -10,38 +10,44 @@ namespace vkcv {
 	Context::~Context() {
 		m_device.destroy();
 		m_instance.destroy();
+		vkcv::terminateGLFW();
 	}
 
 	Context Context::create(const char* applicationName, uint32_t applicationVersion, uint32_t queueCount, std::vector<vk::QueueFlagBits> queueFlags, std::vector<const char*> instanceExtensions, std::vector<const char*> deviceExtensions) {
-		glfwInit();
+		vkcv::initGLFW();
 
 		// check for layer support
-		uint32_t layerCount = 0;
-		vk::enumerateInstanceLayerProperties(&layerCount, nullptr);
-		std::vector<vk::LayerProperties> layerProperties(layerCount);
-		vk::enumerateInstanceLayerProperties(&layerCount, layerProperties.data());
+		
+		const std::vector<vk::LayerProperties>& layerProperties = vk::enumerateInstanceLayerProperties();
+		
 		std::vector<const char*> supportedLayers;
+		supportedLayers.reserve(layerProperties.size());
+		
 		for (auto& elem : layerProperties) {
 			supportedLayers.push_back(elem.layerName);
 		}
 
 // if in debug mode, check if validation layers are supported. Enable them if supported
-#if _DEBUG
+#ifndef NDEBUG
 		std::vector<const char*> validationLayers = {
-		"VK_LAYER_KHRONOS_validation"
+			"VK_LAYER_KHRONOS_validation"
 		};
+		
 		if (!Context::checkSupport(supportedLayers, validationLayers)) {
 			throw std::runtime_error("Validation layers requested but not available!");
 		}
 #endif
-
-
+		
 		// check for extension support
 		std::vector<vk::ExtensionProperties> instanceExtensionProperties = vk::enumerateInstanceExtensionProperties();
+		
 		std::vector<const char*> supportedExtensions;
+		supportedExtensions.reserve(instanceExtensionProperties.size());
+		
 		for (auto& elem : instanceExtensionProperties) {
 			supportedExtensions.push_back(elem.extensionName);
 		}
+		
 		if (!checkSupport(supportedExtensions, instanceExtensions)) {
 			throw std::runtime_error("The requested instance extensions are not supported!");
 		}
@@ -67,7 +73,7 @@ namespace vkcv {
 			instanceExtensions.data()
 		);
 
-#if _DEBUG
+#ifndef NDEBUG
 		instanceCreateInfo.enabledLayerCount = static_cast<uint32_t>(validationLayers.size());
 		instanceCreateInfo.ppEnabledLayerNames = validationLayers.data();
 #endif
@@ -105,7 +111,7 @@ namespace vkcv {
 			nullptr		// Should our device use some features??? If yes: TODO
 		);
 
-#if _DEBUG
+#ifndef NDEBUG
 		deviceCreateInfo.enabledLayerCount = static_cast<uint32_t>(validationLayers.size());
 		deviceCreateInfo.ppEnabledLayerNames = validationLayers.data();
 #endif
@@ -267,7 +273,7 @@ namespace vkcv {
 		const char** glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);
 		std::vector<const char*> extensions(glfwExtensions, glfwExtensions + glfwExtensionCount);
 
-#if _DEBUG
+#ifndef NDEBUG
 	extensions.push_back(VK_EXT_DEBUG_UTILS_EXTENSION_NAME);
 #endif