Initial work

Ryujinx.Graphics.Shader/Decoders/OpCodeIpa.cs

@@ -0,0 +1,20 @@
+using Ryujinx.Graphics.Shader.Instructions;
+
+namespace Ryujinx.Graphics.Shader.Decoders
+{
+    class OpCodeIpa : OpCodeAluReg
+    {
+        public int AttributeOffset { get; }
+
+        public InterpolationMode Mode { get; }
+
+        public OpCodeIpa(InstEmitter emitter, ulong address, long opCode) : base(emitter, address, opCode)
+        {
+            AttributeOffset = opCode.Extract(28, 10);
+
+            Saturate = opCode.Extract(51);
+
+            Mode = (InterpolationMode)opCode.Extract(54, 2);
+        }
+    }
+}