fix(macos): macOS build fixes and MoltenVK improvements

- Switch to Ryujinx MoltenVK build compiled with older Metal SDK to avoid
  MSL 3.2 thread_scope_subgroup bugs that cause text rendering issues
- Exclude Apple from GNU ld.bfd linker option (macOS uses different linker)
- Handle VK_ERROR_FRAGMENTED_POOL in Vulkan descriptor pool allocation

CMakeModules/DownloadExternals.cmake

@@ -44,12 +44,12 @@ endfunction()
 function(download_moltenvk_external platform version)
     set(MOLTENVK_DIR "${CMAKE_BINARY_DIR}/externals/MoltenVK")
     set(MOLTENVK_TAR "${CMAKE_BINARY_DIR}/externals/MoltenVK.tar")
-    # MoltenVK release asset filenames use lowercase platform names (e.g., 'macos', 'ios'),
-    # but the extracted directory structure uses mixed case (e.g., 'macOS', 'iOS').
+    # Use Ryujinx MoltenVK build which is compiled with an older Metal SDK
+    # This avoids MSL 3.2 bugs with thread_scope_subgroup and fixes text rendering issues
     string(TOLOWER "${platform}" MOLTENVK_ASSET_PLATFORM)
     if (NOT EXISTS ${MOLTENVK_DIR})
         if (NOT EXISTS ${MOLTENVK_TAR})
-            file(DOWNLOAD https://github.com/KhronosGroup/MoltenVK/releases/download/${version}/MoltenVK-${MOLTENVK_ASSET_PLATFORM}.tar
+            file(DOWNLOAD https://github.com/V380-Ori/Ryujinx.MoltenVK/releases/download/${version}-ryujinx/MoltenVK-${MOLTENVK_ASSET_PLATFORM}.tar
                 ${MOLTENVK_TAR} SHOW_PROGRESS)
         endif()
 

src/citron/CMakeLists.txt

@@ -396,7 +396,7 @@ if (APPLE)
 
     if (NOT USE_SYSTEM_MOLTENVK)
         set(MOLTENVK_PLATFORM "macOS")
-        set(MOLTENVK_VERSION "v1.4.0-rc1")
+        set(MOLTENVK_VERSION "v1.4.0")
         download_moltenvk_external(${MOLTENVK_PLATFORM} ${MOLTENVK_VERSION})
     endif()
     find_library(MOLTENVK_LIBRARY MoltenVK REQUIRED)
@@ -421,7 +421,7 @@ elseif(WIN32)
 endif()
 
 # Robust static linking and linker selection under GCC LTO
-if (NOT MSVC)
+if (NOT MSVC AND NOT APPLE)
     # Use GNU ld.bfd for GCC LTO plugin-aware archive resolution
     target_link_options(citron PRIVATE -fuse-ld=bfd)
 

src/citron_cmd/CMakeLists.txt

@@ -29,7 +29,7 @@ add_executable(citron-cmd
 )
 
 # Robust static linking and linker selection under GCC LTO
-if (NOT MSVC)
+if (NOT MSVC AND NOT APPLE)
     # Use GNU ld.bfd for GCC LTO plugin-aware archive resolution
     target_link_options(citron-cmd PRIVATE -fuse-ld=bfd)
 

src/dedicated_room/CMakeLists.txt

@@ -8,7 +8,7 @@ add_executable(citron-room
 )
 
 # Robust static linking order using GNU ld group to resolve cycles
-if (NOT MSVC)
+if (NOT MSVC AND NOT APPLE)
     # Use GNU ld.bfd for GCC LTO archives (ld.lld cannot consume GCC LTO plugin objects)
     target_link_options(citron-room PRIVATE -fuse-ld=bfd)
 

src/video_core/vulkan_common/vulkan_wrapper.cpp

@@ -565,6 +565,7 @@ DescriptorSets DescriptorPool::Allocate(const VkDescriptorSetAllocateInfo& ai) c
     case VK_SUCCESS:
         return DescriptorSets(std::move(sets), num, owner, handle, *dld);
     case VK_ERROR_OUT_OF_POOL_MEMORY:
+    case VK_ERROR_FRAGMENTED_POOL:
         return {};
     default:
         throw Exception(result);