Initial tessellation shader support (#2534)

* Initial tessellation shader support

* Nits

* Re-arrange built-in table

* This is not needed anymore

* PR feedback

2 files changed, 14 insertions, 8 deletions

diff --git a/Ryujinx.Graphics.Shader/StructuredIr/OperandInfo.cs b/Ryujinx.Graphics.Shader/StructuredIr/OperandInfo.cs
index 95c5731a..e56008f0 100644
--- a/Ryujinx.Graphics.Shader/StructuredIr/OperandInfo.cs
+++ b/Ryujinx.Graphics.Shader/StructuredIr/OperandInfo.cs
@@ -19,15 +19,15 @@ namespace Ryujinx.Graphics.Shader.StructuredIr
 
         public static VariableType GetVarType(OperandType type)
         {
-            switch (type)
+            return type switch
             {
-                case OperandType.Attribute:      return VariableType.F32;
-                case OperandType.Constant:       return VariableType.S32;
-                case OperandType.ConstantBuffer: return VariableType.F32;
-                case OperandType.Undefined:      return VariableType.S32;
-            }
-
-            throw new ArgumentException($"Invalid operand type \"{type}\".");
+                OperandType.Attribute => VariableType.F32,
+                OperandType.AttributePerPatch => VariableType.F32,
+                OperandType.Constant => VariableType.S32,
+                OperandType.ConstantBuffer => VariableType.F32,
+                OperandType.Undefined => VariableType.S32,
+                _ => throw new ArgumentException($"Invalid operand type \"{type}\".")
+            };
         }
     }
 }
\ No newline at end of file
diff --git a/Ryujinx.Graphics.Shader/StructuredIr/StructuredProgramContext.cs b/Ryujinx.Graphics.Shader/StructuredIr/StructuredProgramContext.cs
index a9e44175..2a39d021 100644
--- a/Ryujinx.Graphics.Shader/StructuredIr/StructuredProgramContext.cs
+++ b/Ryujinx.Graphics.Shader/StructuredIr/StructuredProgramContext.cs
@@ -282,6 +282,12 @@ namespace Ryujinx.Graphics.Shader.StructuredIr
 
         public AstOperand GetOperandUse(Operand operand)
         {
+            // If this flag is set, we're reading from an output attribute instead.
+            if (operand.Type.IsAttribute() && (operand.Value & AttributeConsts.LoadOutputMask) != 0)
+            {
+                return GetOperandDef(operand);
+            }
+
             return GetOperand(operand);
         }