Start Metal Backend

Revert build yml changes

src/Ryujinx.Graphics.Shader/CodeGen/Msl/CodeGenContext.cs

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+using Ryujinx.Graphics.Shader.StructuredIr;
+using Ryujinx.Graphics.Shader.Translation;
+using System.Text;
+
+namespace Ryujinx.Graphics.Shader.CodeGen.Msl
+{
+    class CodeGenContext
+    {
+        public const string Tab = "    ";
+
+        public StructuredProgramInfo Info { get; }
+        public ShaderConfig Config { get; }
+
+        private readonly StringBuilder _sb;
+
+        private int _level;
+
+        private string _indentation;
+
+        public CodeGenContext(StructuredProgramInfo info, ShaderConfig config)
+        {
+            Info = info;
+            Config = Config;
+
+            _sb = new StringBuilder();
+        }
+
+        public void AppendLine()
+        {
+            _sb.AppendLine();
+        }
+
+        public void AppendLine(string str)
+        {
+            _sb.AppendLine(_indentation + str);
+        }
+
+        public string GetCode()
+        {
+            return _sb.ToString();
+        }
+
+        public void EnterScope()
+        {
+            AppendLine("{");
+
+            _level++;
+
+            UpdateIndentation();
+        }
+
+        public void LeaveScope(string suffix = "")
+        {
+            if (_level == 0)
+            {
+                return;
+            }
+
+            _level--;
+
+            UpdateIndentation();
+
+            AppendLine("}" + suffix);
+        }
+
+        public StructuredFunction GetFunction(int id)
+        {
+            return Info.Functions[id];
+        }
+
+        private void UpdateIndentation()
+        {
+            _indentation = GetIndentation(_level);
+        }
+
+        private static string GetIndentation(int level)
+        {
+            string indentation = string.Empty;
+
+            for (int index = 0; index < level; index++)
+            {
+                indentation += Tab;
+            }
+
+            return indentation;
+        }
+    }
+}

src/Ryujinx.Graphics.Shader/CodeGen/Msl/Declarations.cs

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+using Ryujinx.Graphics.Shader.CodeGen.Glsl;
+using Ryujinx.Graphics.Shader.StructuredIr;
+
+namespace Ryujinx.Graphics.Shader.CodeGen.Msl
+{
+    static class Declarations
+    {
+        public static void Declare(CodeGenContext context, StructuredProgramInfo info)
+        {
+            context.AppendLine("#include <metal_stdlib>");
+            context.AppendLine("#include <simd/simd.h>");
+            context.AppendLine();
+            context.AppendLine("using namespace metal;");
+        }
+    }
+}

src/Ryujinx.Graphics.Shader/CodeGen/Msl/MslGenerator.cs

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+using Ryujinx.Graphics.Shader.StructuredIr;
+using Ryujinx.Graphics.Shader.Translation;
+
+namespace Ryujinx.Graphics.Shader.CodeGen.Msl
+{
+    static class MslGenerator
+    {
+        public static string Generate(StructuredProgramInfo info, ShaderConfig config)
+        {
+            CodeGenContext context = new CodeGenContext(info, config);
+
+            Declarations.Declare(context, info);
+
+            return context.GetCode();
+        }
+    }
+}