Initial work

Ryujinx.Graphics.Shader/Decoders/OpCodeSetReg.cs

@@ -0,0 +1,14 @@
+using Ryujinx.Graphics.Shader.Instructions;
+
+namespace Ryujinx.Graphics.Shader.Decoders
+{
+    class OpCodeSetReg : OpCodeSet, IOpCodeReg
+    {
+        public Register Rb { get; protected set; }
+
+        public OpCodeSetReg(InstEmitter emitter, ulong address, long opCode) : base(emitter, address, opCode)
+        {
+            Rb = new Register(opCode.Extract(20, 8), RegisterType.Gpr);
+        }
+    }
+}