EXPERIMENTAL: Metal backend (#441)

This is not a continuation of the Metal backend; this is simply bringing
the branch up to date and merging it as-is behind an experiment.

---------

Co-authored-by: Isaac Marovitz <isaacryu@icloud.com>
Co-authored-by: Samuliak <samuliak77@gmail.com>
Co-authored-by: SamoZ256 <96914946+SamoZ256@users.noreply.github.com>
Co-authored-by: Isaac Marovitz <42140194+IsaacMarovitz@users.noreply.github.com>
Co-authored-by: riperiperi <rhy3756547@hotmail.com>
Co-authored-by: Gabriel A <gab.dark.100@gmail.com>

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

@@ -0,0 +1,94 @@
+using Ryujinx.Graphics.Shader.Translation;
+using System;
+using System.Globalization;
+
+namespace Ryujinx.Graphics.Shader.CodeGen.Msl
+{
+    static class NumberFormatter
+    {
+        private const int MaxDecimal = 256;
+
+        public static bool TryFormat(int value, AggregateType dstType, out string formatted)
+        {
+            switch (dstType)
+            {
+                case AggregateType.FP32:
+                    return TryFormatFloat(BitConverter.Int32BitsToSingle(value), out formatted);
+                case AggregateType.S32:
+                    formatted = FormatInt(value);
+                    break;
+                case AggregateType.U32:
+                    formatted = FormatUint((uint)value);
+                    break;
+                case AggregateType.Bool:
+                    formatted = value != 0 ? "true" : "false";
+                    break;
+                default:
+                    throw new ArgumentException($"Invalid variable type \"{dstType}\".");
+            }
+
+            return true;
+        }
+
+        public static string FormatFloat(float value)
+        {
+            if (!TryFormatFloat(value, out string formatted))
+            {
+                throw new ArgumentException("Failed to convert float value to string.");
+            }
+
+            return formatted;
+        }
+
+        public static bool TryFormatFloat(float value, out string formatted)
+        {
+            if (float.IsNaN(value) || float.IsInfinity(value))
+            {
+                formatted = null;
+
+                return false;
+            }
+
+            formatted = value.ToString("G9", CultureInfo.InvariantCulture);
+
+            if (!(formatted.Contains('.') ||
+                  formatted.Contains('e') ||
+                  formatted.Contains('E')))
+            {
+                formatted += ".0f";
+            }
+
+            return true;
+        }
+
+        public static string FormatInt(int value, AggregateType dstType)
+        {
+            return dstType switch
+            {
+                AggregateType.S32 => FormatInt(value),
+                AggregateType.U32 => FormatUint((uint)value),
+                _ => throw new ArgumentException($"Invalid variable type \"{dstType}\".")
+            };
+        }
+
+        public static string FormatInt(int value)
+        {
+            if (value <= MaxDecimal && value >= -MaxDecimal)
+            {
+                return value.ToString(CultureInfo.InvariantCulture);
+            }
+
+            return $"as_type<int>(0x{value.ToString("X", CultureInfo.InvariantCulture)})";
+        }
+
+        public static string FormatUint(uint value)
+        {
+            if (value <= MaxDecimal && value >= 0)
+            {
+                return value.ToString(CultureInfo.InvariantCulture) + "u";
+            }
+
+            return $"as_type<uint>(0x{value.ToString("X", CultureInfo.InvariantCulture)})";
+        }
+    }
+}