From b9b5db734c5022d68d5abff095281112e92a4725 Mon Sep 17 00:00:00 2001
From: Lynix <lynix680@gmail.com>
Date: Wed, 1 Jun 2016 21:00:00 +0200
Subject: [PATCH] Vulkan/Core: Add loader and instance initialization

Former-commit-id: d0635e2727d1f2f52fe8a03ff0530134645f1b1d [formerly fc5f88194171efde1e68387154db661072bfdf90]
Former-commit-id: 6e42212b86524334a8324b1e49230303b49f969f
---
 include/Nazara/Vulkan/Vulkan.hpp |   8 ++
 src/Nazara/Vulkan/Vulkan.cpp     | 122 +++++++++++++++++++++++++++++++
 2 files changed, 130 insertions(+)

diff --git a/include/Nazara/Vulkan/Vulkan.hpp b/include/Nazara/Vulkan/Vulkan.hpp
index 9d90202c2..59c1bb4f3 100644
--- a/include/Nazara/Vulkan/Vulkan.hpp
+++ b/include/Nazara/Vulkan/Vulkan.hpp
@@ -9,7 +9,9 @@
 
 #include <Nazara/Prerequesites.hpp>
 #include <Nazara/Core/Initializer.hpp>
+#include <Nazara/Core/ParameterList.hpp>
 #include <Nazara/Vulkan/Config.hpp>
+#include <Nazara/Vulkan/VkInstance.hpp>
 
 namespace Nz
 {
@@ -19,13 +21,19 @@ namespace Nz
 			Vulkan() = delete;
 			~Vulkan() = delete;
 
+			static Vk::Instance& GetInstance();
+
 			static bool Initialize();
 
 			static bool IsInitialized();
 
+			static void SetParameters(const ParameterList& parameters);
+
 			static void Uninitialize();
 
 		private:
+			static Vk::Instance s_instance;
+			static ParameterList s_initializationParameters;
 			static unsigned int s_moduleReferenceCounter;
 	};	
 }
diff --git a/src/Nazara/Vulkan/Vulkan.cpp b/src/Nazara/Vulkan/Vulkan.cpp
index 00bb55337..dc7a201ff 100644
--- a/src/Nazara/Vulkan/Vulkan.cpp
+++ b/src/Nazara/Vulkan/Vulkan.cpp
@@ -12,6 +12,11 @@
 
 namespace Nz
 {
+	Vk::Instance& Vulkan::GetInstance()
+	{
+		return s_instance;
+	}
+
 	bool Vulkan::Initialize()
 	{
 		if (s_moduleReferenceCounter > 0)
@@ -32,6 +37,113 @@ namespace Nz
 		CallOnExit onExit(Vulkan::Uninitialize);
 
 		// Initialize module here
+		if (!Vk::Loader::Initialize())
+		{
+			NazaraError("Failed to load Vulkan API, it may be not installed on your system");
+			return false;
+		}
+
+		String appName = "Another application made with Nazara Engine";
+		String engineName = "Nazara Engine - Vulkan Renderer";
+		UInt32 apiVersion = VK_MAKE_VERSION(1, 0, 8);
+		UInt32 appVersion = VK_MAKE_VERSION(1, 0, 0);
+		UInt32 engineVersion = VK_MAKE_VERSION(1, 0, 0);
+
+		s_initializationParameters.GetStringParameter("VkAppInfo_OverrideApplicationName", &appName);
+		s_initializationParameters.GetStringParameter("VkAppInfo_OverrideEngineName", &engineName);
+
+		int iParam;
+
+		if (s_initializationParameters.GetIntegerParameter("VkAppInfo_OverrideAPIVersion", &iParam))
+			apiVersion = iParam;
+
+		if (s_initializationParameters.GetIntegerParameter("VkAppInfo_OverrideApplicationVersion", &iParam))
+			appVersion = iParam;
+
+		if (s_initializationParameters.GetIntegerParameter("VkAppInfo_OverrideEngineVersion", &iParam))
+			engineVersion = iParam;
+
+		VkApplicationInfo appInfo = {
+			VK_STRUCTURE_TYPE_APPLICATION_INFO,
+			nullptr,
+			appName.GetConstBuffer(),
+			appVersion,
+			engineName.GetConstBuffer(),
+			engineVersion,
+			apiVersion
+		};
+
+		VkInstanceCreateFlags createFlags = 0;
+
+		if (s_initializationParameters.GetIntegerParameter("VkInstanceInfo_OverrideCreateFlags", &iParam))
+			createFlags = static_cast<VkInstanceCreateFlags>(iParam);
+
+		std::vector<const char*> enabledLayers;
+		std::vector<const char*> enabledExtensions;
+
+		bool bParam;
+		if (!s_initializationParameters.GetBooleanParameter("VkInstanceInfo_OverrideEnabledExtensions", &bParam) || !bParam)
+		{
+			enabledExtensions.push_back("VK_KHR_surface");
+
+			#ifdef VK_USE_PLATFORM_ANDROID_KHR
+			enabledExtensions.push_back("VK_KHR_android_surface");
+			#endif
+
+			#ifdef VK_USE_PLATFORM_MIR_KHR
+			enabledExtensions.push_back("VK_KHR_mir_surface");
+			#endif
+
+			#ifdef VK_USE_PLATFORM_XCB_KHR
+			enabledExtensions.push_back("VK_KHR_xcb_surface");
+			#endif
+
+			#ifdef VK_USE_PLATFORM_XLIB_KHR
+			enabledExtensions.push_back("VK_KHR_xlib_surface");
+			#endif
+
+			#ifdef VK_USE_PLATFORM_WAYLAND_KHR
+			enabledExtensions.push_back("VK_KHR_wayland_surface");
+			#endif
+
+			#ifdef VK_USE_PLATFORM_WIN32_KHR
+			enabledExtensions.push_back("VK_KHR_win32_surface");
+			#endif
+		}
+
+		std::vector<String> additionalExtensions; // Just to keep the String alive
+		if (s_initializationParameters.GetIntegerParameter("VkInstanceInfo_EnabledExtensionCount", &iParam))
+		{
+			for (int i = 0; i < iParam; ++i)
+			{
+				Nz::String parameterName = "VkInstanceInfo_EnabledExtension" + String::Number(i);
+				Nz::String extension;
+				if (s_initializationParameters.GetStringParameter(parameterName, &extension))
+				{
+					additionalExtensions.emplace_back(std::move(extension));
+					enabledExtensions.push_back(additionalExtensions.back().GetConstBuffer());
+				}
+				else
+					NazaraWarning("Parameter " + parameterName + " expected");
+			}
+		}
+
+		VkInstanceCreateInfo instanceInfo = {
+			VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO,
+			nullptr,
+			createFlags,
+			&appInfo,
+			UInt32(enabledLayers.size()),
+			enabledLayers.data(),
+			UInt32(enabledExtensions.size()),
+			enabledExtensions.data()
+		};
+		
+		if (!s_instance.Create(instanceInfo))
+		{
+			NazaraError("Failed to create instance");
+			return false;
+		}
 
 		onExit.Reset();
 
@@ -44,6 +156,11 @@ namespace Nz
 		return s_moduleReferenceCounter != 0;
 	}
 
+	void Vulkan::SetParameters(const ParameterList& parameters)
+	{
+		s_initializationParameters = parameters;
+	}
+
 	void Vulkan::Uninitialize()
 	{
 		if (s_moduleReferenceCounter != 1)
@@ -58,6 +175,9 @@ namespace Nz
 		s_moduleReferenceCounter = 0;
 
 		// Uninitialize module here
+		s_instance.Destroy();
+
+		Vk::Loader::Uninitialize();
 
 		NazaraNotice("Uninitialized: Vulkan module");
 
@@ -65,6 +185,8 @@ namespace Nz
 		Utility::Uninitialize();
 	}
 
+	Vk::Instance Vulkan::s_instance;
+	ParameterList Vulkan::s_initializationParameters;
 	unsigned int Vulkan::s_moduleReferenceCounter = 0;	
 }