Implement experimental Vulkan backend

Source/Core/VideoBackends/Vulkan/VulkanLoader.h

@@ -0,0 +1,45 @@
+// Copyright 2016 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#define VK_NO_PROTOTYPES
+
+#if defined(WIN32)
+#define VK_USE_PLATFORM_WIN32_KHR
+#elif defined(HAVE_X11)
+// Currently we're getting xlib handles passed to the backend.
+// If this ever changes to xcb, it's a simple change here.
+#define VK_USE_PLATFORM_XLIB_KHR
+//#define VK_USE_PLATFORM_XCB_KHR
+#elif defined(ANDROID)
+#define VK_USE_PLATFORM_ANDROID_KHR
+#else
+//#warning Unknown platform
+#endif
+
+#include "vulkan/vulkan.h"
+
+// We abuse the preprocessor here to only need to specify function names once.
+#define VULKAN_MODULE_ENTRY_POINT(name, required) extern PFN_##name name;
+#define VULKAN_INSTANCE_ENTRY_POINT(name, required) extern PFN_##name name;
+#define VULKAN_DEVICE_ENTRY_POINT(name, required) extern PFN_##name name;
+#include "VideoBackends/Vulkan/VulkanEntryPoints.inl"
+#undef VULKAN_DEVICE_ENTRY_POINT
+#undef VULKAN_INSTANCE_ENTRY_POINT
+#undef VULKAN_MODULE_ENTRY_POINT
+
+namespace Vulkan
+{
+bool LoadVulkanLibrary();
+bool LoadVulkanInstanceFunctions(VkInstance instance);
+bool LoadVulkanDeviceFunctions(VkDevice device);
+void UnloadVulkanLibrary();
+
+const char* VkResultToString(VkResult res);
+void LogVulkanResult(int level, const char* func_name, VkResult res, const char* msg, ...);
+
+#define LOG_VULKAN_ERROR(res, ...) LogVulkanResult(2, __FUNCTION__, res, __VA_ARGS__)
+
+}  // namespace Vulkan