Add Metal 3.0 beta 4 compiler

Fixes tgjones#111

Author: tgjones

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## 2022-09-19
 
 * Updated glslang to latest trunk (#112)
+* Added Metal compiler 3.0 beta 4
 
 ## 2022-07-12
 

src/ShaderPlayground.Core/Compilers/Metal/MetalCompiler.cs

@@ -17,7 +17,7 @@ internal sealed class MetalCompiler : IShaderCompiler
         public ShaderCompilerParameter[] Parameters { get; } =
         {
             CommonParameters.CreateVersionParameter("metal"),
-            new ShaderCompilerParameter("MetalVersion", "Metal Language Version", ShaderCompilerParameterType.ComboBox, MetalVersions, "macos-metal2.4"),
+            new ShaderCompilerParameter("MetalVersion", "Metal Language Version", ShaderCompilerParameterType.ComboBox, MetalVersions, "metal3.0"),
             CommonParameters.CreateOutputParameter(new[] { LanguageNames.MetalIR }),
         };
 
@@ -39,6 +39,7 @@ internal sealed class MetalCompiler : IShaderCompiler
             "ios-metal2.2",
             "ios-metal2.3",
             "ios-metal2.4",
+            "metal3.0",
         };
 
         public ShaderCompilerResult Compile(ShaderCode shaderCode, ShaderCompilerArguments arguments, List<ShaderCompilerArguments> previousCompilerArguments)