From 9d26aa8d0697e75eabbc8d1edc58579b8a31c3b0 Mon Sep 17 00:00:00 2001
From: Isaac Marovitz <isaacryu@icloud.com>
Date: Fri, 28 Jun 2024 21:13:59 +0100
Subject: [PATCH] Fragment input interpolation qualifiers
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Fixes Mario’s shadow in SMO
---
 .../CodeGen/Msl/Declarations.cs                    | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/Ryujinx.Graphics.Shader/CodeGen/Msl/Declarations.cs b/src/Ryujinx.Graphics.Shader/CodeGen/Msl/Declarations.cs
index b15b482db..3179c80a2 100644
--- a/src/Ryujinx.Graphics.Shader/CodeGen/Msl/Declarations.cs
+++ b/src/Ryujinx.Graphics.Shader/CodeGen/Msl/Declarations.cs
@@ -299,6 +299,18 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Msl
 
                     foreach (var ioDefinition in inputs.OrderBy(x => x.Location))
                     {
+                        string iq = string.Empty;
+
+                        if (context.Definitions.Stage == ShaderStage.Fragment)
+                        {
+                            iq = context.Definitions.ImapTypes[ioDefinition.Location].GetFirstUsedType() switch
+                            {
+                                PixelImap.Constant => "[[flat]] ",
+                                PixelImap.ScreenLinear => "[[center_no_perspective]] ",
+                                _ => string.Empty,
+                            };
+                        }
+
                         string type = ioDefinition.IoVariable switch
                         {
                             // IoVariable.Position => "float4",
@@ -329,7 +341,7 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Msl
                             _ => ""
                         };
 
-                        context.AppendLine($"{type} {name} {suffix};");
+                        context.AppendLine($"{type} {name} {iq}{suffix};");
                     }
 
                     context.LeaveScope(";");