Third-party: add Metal dependency submodules

.gitmodules

@@ -111,6 +111,12 @@
 [submodule "third_party/DirectX-Headers"]
 	path = third_party/DirectX-Headers
 	url = https://github.com/microsoft/DirectX-Headers.git
+[submodule "third_party/metal-cpp"]
+	path = third_party/metal-cpp
+	url = https://github.com/wmarti/metal-cpp.git
+[submodule "third_party/metal-shader-converter"]
+	path = third_party/metal-shader-converter
+	url = https://github.com/wmarti/metal-shader-converter.git
 [submodule "third_party/asio"]
 	path = third_party/asio
 	url = https://github.com/chriskohlhoff/asio.git

premake5.lua

@@ -434,6 +434,8 @@ workspace("xenia")
   include("third_party/fmt.lua")
   include("third_party/glslang-spirv.lua")
   include("third_party/imgui.lua")
+  include("third_party/metal-shader-converter.lua")
+  include("third_party/metal-cpp.lua")
   include("third_party/miniaudio.lua")
   include("third_party/mspack.lua")
   include("third_party/snappy.lua")

third_party/metal-cpp.lua

@@ -0,0 +1,21 @@
+if not os.istarget("macosx") then
+  return
+end
+
+group("third_party")
+project("metal-cpp")
+  uuid("11c84c8d-bfa2-4b14-b832-4e85e9ca8e3b")
+  kind("None")  -- Header-only library
+  language("C++")
+  defines({
+    "METAL_CPP_AVAILABLE=1",
+  })
+  includedirs({
+    "metal-cpp",
+  })
+  files({
+    "metal-cpp/Foundation/Foundation.hpp",
+    "metal-cpp/Metal/Metal.hpp",
+    "metal-cpp/MetalFX/MetalFX.hpp",
+    "metal-cpp/QuartzCore/QuartzCore.hpp",
+  })

third_party/metal-shader-converter.lua

@@ -0,0 +1,30 @@
+if not os.istarget("macosx") then
+  return
+end
+
+group("third_party")
+project("metal-shader-converter")
+  uuid("b1b2c3d4-e5f6-7890-abcd-ef1234567890")
+  kind("StaticLib")
+  language("C++")
+  defines({
+    "_LIB",
+  })
+  includedirs({
+    "metal-shader-converter/include",
+  })
+  files({
+    "metal-shader-converter/include/metal_irconverter.h",
+    "metal-shader-converter/include/metal_irconverter_runtime.h",
+  })
+  -- Link against the Metal Shader Converter dynamic library
+  libdirs({
+    "metal-shader-converter/lib",
+  })
+  links({
+    "metalirconverter",
+  })
+  links({
+    "Metal.framework",
+    "MetalKit.framework",
+  })