From fb5402ce812cad562e184488aa662273e8fbdc0b Mon Sep 17 00:00:00 2001
From: Isaac Marovitz <isaacryu@icloud.com>
Date: Tue, 10 Oct 2023 14:14:28 -0400
Subject: [PATCH] Implement CreateProgram

---
 src/Ryujinx.Graphics.Metal/MetalRenderer.cs |  3 +-
 src/Ryujinx.Graphics.Metal/Program.cs       | 49 ++++++++++++++++++++-
 2 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/src/Ryujinx.Graphics.Metal/MetalRenderer.cs b/src/Ryujinx.Graphics.Metal/MetalRenderer.cs
index 18f11e583..5ecaf7575 100644
--- a/src/Ryujinx.Graphics.Metal/MetalRenderer.cs
+++ b/src/Ryujinx.Graphics.Metal/MetalRenderer.cs
@@ -74,8 +74,7 @@ namespace Ryujinx.Graphics.Metal
 
         public IProgram CreateProgram(ShaderSource[] shaders, ShaderInfo info)
         {
-            Logger.Warning?.Print(LogClass.Gpu, "Not Implemented!");
-            return new Program();
+            return new Program(shaders, _device);
         }
 
         public ISampler CreateSampler(SamplerCreateInfo info)
diff --git a/src/Ryujinx.Graphics.Metal/Program.cs b/src/Ryujinx.Graphics.Metal/Program.cs
index a7953dde1..6cf2a96e5 100644
--- a/src/Ryujinx.Graphics.Metal/Program.cs
+++ b/src/Ryujinx.Graphics.Metal/Program.cs
@@ -1,12 +1,59 @@
+using Ryujinx.Common.Logging;
 using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.Shader;
+using SharpMetal.Foundation;
+using SharpMetal.Metal;
+using System;
+using System.Runtime.Versioning;
 
 namespace Ryujinx.Graphics.Metal
 {
+    [SupportedOSPlatform("macos")]
     class Program : IProgram
     {
+        private ProgramLinkStatus _status = ProgramLinkStatus.Incomplete;
+        private MTLFunction[] _shaderHandles;
+
+        public Program(ShaderSource[] shaders, MTLDevice device)
+        {
+            _shaderHandles = new MTLFunction[shaders.Length];
+
+            for (int index = 0; index < shaders.Length; index++)
+            {
+                var libraryError = new NSError(IntPtr.Zero);
+                ShaderSource shader = shaders[index];
+                var shaderLibrary = device.NewLibrary(StringHelper.NSString(shader.Code), new MTLCompileOptions(IntPtr.Zero), ref libraryError);
+                if (libraryError != IntPtr.Zero)
+                {
+                    Logger.Warning?.Print(LogClass.Gpu, $"Shader linking failed: \n{StringHelper.String(libraryError.LocalizedDescription)}");
+                    _status = ProgramLinkStatus.Failure;
+                }
+                else
+                {
+                    switch (shaders[index].Stage)
+                    {
+                        case ShaderStage.Compute:
+                            _shaderHandles[index] = shaderLibrary.NewFunction(StringHelper.NSString("computeMain"));
+                            break;
+                        case ShaderStage.Vertex:
+                            _shaderHandles[index] = shaderLibrary.NewFunction(StringHelper.NSString("vertexMain"));
+                            break;
+                        case ShaderStage.Fragment:
+                            _shaderHandles[index] = shaderLibrary.NewFunction(StringHelper.NSString("fragmentMain"));
+                            break;
+                        default:
+                            Logger.Warning?.Print(LogClass.Gpu, $"Cannot handle stage {shaders[index].Stage}!");
+                            break;
+                    }
+
+                    _status = ProgramLinkStatus.Success;
+                }
+            }
+        }
+
         public ProgramLinkStatus CheckProgramLink(bool blocking)
         {
-            return ProgramLinkStatus.Success;
+            return _status;
         }
 
         public byte[] GetBinary()