Add iOS platform (refactor Mac into shared Apple platform impl)

Source/Engine/GraphicsDevice/Vulkan/iOS/iOSVulkanPlatform.cpp

@@ -0,0 +1,24 @@
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+#if GRAPHICS_API_VULKAN && PLATFORM_IOS
+
+#include "iOSVulkanPlatform.h"
+#include "../RenderToolsVulkan.h"
+#include <UIKit/UIKit.h>
+
+void iOSVulkanPlatform::GetInstanceExtensions(Array<const char*>& extensions, Array<const char*>& layers)
+{
+    extensions.Add(VK_KHR_SURFACE_EXTENSION_NAME);
+	extensions.Add(VK_MVK_IOS_SURFACE_EXTENSION_NAME);
+}
+
+void iOSVulkanPlatform::CreateSurface(void* windowHandle, VkInstance instance, VkSurfaceKHR* surface)
+{
+	MISSING_CODE("TODO: Vulkan via MoltenVK on iOS");
+	VkIOSSurfaceCreateInfoMVK surfaceCreateInfo;
+	RenderToolsVulkan::ZeroStruct(surfaceCreateInfo, VK_STRUCTURE_TYPE_IOS_SURFACE_CREATE_INFO_MVK);
+	surfaceCreateInfo.pView = nullptr; // UIView or CAMetalLayer
+	VALIDATE_VULKAN_RESULT(vkCreateIOSSurfaceMVK(instance, &surfaceCreateInfo, nullptr, surface));
+}
+
+#endif