[vk, macos] register and use legacy MVK surface if metal is unavailable

Signed-off-by: lizzie <lizzie@eden-emu.dev>

src/video_core/vulkan_common/vk_enum_string_helper.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -5,4 +8,7 @@
 
 #include "video_core/vulkan_common/vulkan.h"
 
+#if defined(__APPLE__) && !defined(VK_STRUCTURE_TYPE_OH_SURFACE_CREATE_INFO_OHOS)
+#   define VK_STRUCTURE_TYPE_OH_SURFACE_CREATE_INFO_OHOS VK_STRUCTURE_TYPE_SURFACE_CREATE_INFO_OHOS
+#endif
 #include <vulkan/vk_enum_string_helper.h>

src/video_core/vulkan_common/vulkan.h

@@ -11,6 +11,7 @@
 #define VK_USE_PLATFORM_WIN32_KHR
 #elif defined(__APPLE__)
 #define VK_USE_PLATFORM_METAL_EXT
+#define VK_USE_PLATFORM_MACOS_MVK
 #elif defined(__ANDROID__)
 #define VK_USE_PLATFORM_ANDROID_KHR
 #elif defined(__HAIKU__)
@@ -29,6 +30,15 @@
 #ifndef VK_KHR_MAINTENANCE_8_EXTENSION_NAME
 #define VK_KHR_MAINTENANCE_8_EXTENSION_NAME "VK_KHR_maintenance8"
 #endif
+#ifndef VK_KHR_MAINTENANCE_9_EXTENSION_NAME
+#define VK_KHR_MAINTENANCE_9_EXTENSION_NAME "VK_KHR_maintenance9"
+#endif
+#ifndef VK_EXT_METAL_SURFACE_EXTENSION_NAME
+#define VK_EXT_METAL_SURFACE_EXTENSION_NAME "VK_EXT_metal_surface"
+#endif
+#ifndef VK_MVK_MACOS_SURFACE_EXTENSION_NAME
+#define VK_MVK_MACOS_SURFACE_EXTENSION_NAME "VK_MVK_macos_surface"
+#endif
 
 // Sanitize macros
 #undef CreateEvent

src/video_core/vulkan_common/vulkan_surface.cpp

@@ -38,11 +38,24 @@ vk::SurfaceKHR CreateSurface(
             .flags = 0,
             .pLayer = static_cast<const CAMetalLayer*>(window_info.render_surface),
         };
-        const auto vkCreateMetalSurfaceEXT = reinterpret_cast<PFN_vkCreateMetalSurfaceEXT>(dld.vkGetInstanceProcAddr(*instance, "vkCreateMetalSurfaceEXT"));
-        if (!vkCreateMetalSurfaceEXT ||
-            vkCreateMetalSurfaceEXT(*instance, &metal_ci, nullptr, &unsafe_surface) != VK_SUCCESS) {
-            LOG_ERROR(Render_Vulkan, "Failed to initialize Metal surface");
-            throw vk::Exception(VK_ERROR_INITIALIZATION_FAILED);
+        const auto vkCreateMetalSurfaceEXT = PFN_vkCreateMetalSurfaceEXT(dld.vkGetInstanceProcAddr(*instance, "vkCreateMetalSurfaceEXT"));
+        if (!vkCreateMetalSurfaceEXT || vkCreateMetalSurfaceEXT(*instance, &metal_ci, nullptr, &unsafe_surface) != VK_SUCCESS) {
+            // TODO: Way to fallback? - where's my vulkan headers
+            // Attempt to make a macOS surface instead then...
+            // This is the deprecated VkMacOSSurfaceCreateInfoMVK(3) version; but should work if the above failed
+            // https://registry.khronos.org/vulkan/specs/latest/man/html/VkMacOSSurfaceCreateInfoMVK.html
+            const VkMacOSSurfaceCreateInfoMVK macos_legacy_ci = {
+                .sType = VK_STRUCTURE_TYPE_MACOS_SURFACE_CREATE_INFO_MVK,
+                .pNext = nullptr,
+                .flags = 0,
+                .pView = static_cast<const void*>(window_info.render_surface),
+            };
+            const auto vkCreateMacOSSurfaceMVK = PFN_vkCreateMacOSSurfaceMVK(dld.vkGetInstanceProcAddr(*instance, "vkCreateMacOSSurfaceMVK"));
+            if (!vkCreateMacOSSurfaceMVK || vkCreateMacOSSurfaceMVK(*instance, &macos_legacy_ci, nullptr, &unsafe_surface) != VK_SUCCESS) {
+                LOG_ERROR(Render_Vulkan, "Failed to initialize Metal/macOS surface");
+                throw vk::Exception(VK_ERROR_INITIALIZATION_FAILED);
+            }
+            LOG_ERROR(Render_Vulkan, "Failed to initialize Metal/macOS surface");
         }
     }
 #elif defined(__ANDROID__)