Vulkan: Add loading of Instance/Device

Former-commit-id: 0184f78824900bd46cff94dbfe829b126b8c984d

src/Nazara/Vulkan/VkLoader.cpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 Jérôme Leclercq
+// Copyright (C) 2016 Jérôme Leclercq
 // This file is part of the "Nazara Engine - Vulkan"
 // For conditions of distribution and use, see copyright notice in Config.hpp
 
@@ -7,8 +7,58 @@
 
 namespace Nz
 {
+	namespace Vk
+	{
+		bool Loader::Initialize()
+		{
+			#ifdef NAZARA_PLATFORM_WINDOWS
+			s_vulkanLib.Load("vulkan-1.dll");
+			#elif defined(NAZARA_PLATFORM_LINUX)
+			s_vulkanLib.Load("libvulkan.so");
+			#else
+			#error Unhandled platform
+			#endif
+
+			if (!s_vulkanLib.IsLoaded())
+			{
+				NazaraError("Failed to open vulkan library: " + s_vulkanLib.GetLastError());
+				return false;
+			}
+
+			// vkGetInstanceProcAddr is the only function that's garantee to be exported
+			vkGetInstanceProcAddr = reinterpret_cast<PFN_vkGetInstanceProcAddr>(s_vulkanLib.GetSymbol("vkGetInstanceProcAddr"));
+			if (!vkGetInstanceProcAddr)
+			{
+				NazaraError("Failed to get symbol \"vkGetInstanceProcAddr\": " + s_vulkanLib.GetLastError());
+				return false;
+			}
+
+			// all other functions should be loaded using vkGetInstanceProcAddr
+			#define NAZARA_VULKAN_LOAD_GLOBAL(func) func = reinterpret_cast<PFN_##func>(vkGetInstanceProcAddr(nullptr, #func))
+
+			NAZARA_VULKAN_LOAD_GLOBAL(vkCreateInstance);
+			NAZARA_VULKAN_LOAD_GLOBAL(vkEnumerateInstanceExtensionProperties);
+			NAZARA_VULKAN_LOAD_GLOBAL(vkEnumerateInstanceLayerProperties);
+
+			#undef NAZARA_VULKAN_LOAD_GLOBAL
+
+			return true;
+		}
+
+		#define NAZARA_VULKAN_GLOBAL_FUNCTION_IMPL(func) PFN_##func Loader::func = nullptr
+
+		NAZARA_VULKAN_GLOBAL_FUNCTION_IMPL(vkCreateInstance);
+		NAZARA_VULKAN_GLOBAL_FUNCTION_IMPL(vkEnumerateInstanceExtensionProperties);
+		NAZARA_VULKAN_GLOBAL_FUNCTION_IMPL(vkEnumerateInstanceLayerProperties);
+		NAZARA_VULKAN_GLOBAL_FUNCTION_IMPL(vkGetInstanceProcAddr);
+
+		#undef NAZARA_VULKAN_GLOBAL_FUNCTION_IMPL
+
+		DynLib Loader::s_vulkanLib;
+
+		void Loader::Uninitialize()
+		{
+			s_vulkanLib.Unload();
+		}
+	}
 }
-
-#define NAZARA_VULKAN_EXPORTED_FUNCTION_IMPL(func) PFN_##func func = nullptr;
-
-NAZARA_VULKAN_EXPORTED_FUNCTION_IMPL(vkGetInstanceProcAddr)