Rewrite shader decoding stage (#2698)

* Rewrite shader decoding stage

* Fix P2R constant buffer encoding

* Fix PSET/PSETP

* PR feedback

* Log unimplemented shader instructions

* Implement NOP

* Remove using

* PR feedback

Ryujinx.Graphics.Shader/Instructions/InstEmitBarrier.cs

@@ -0,0 +1,44 @@
+using Ryujinx.Graphics.Shader.Decoders;
+using Ryujinx.Graphics.Shader.Translation;
+
+namespace Ryujinx.Graphics.Shader.Instructions
+{
+    static partial class InstEmit
+    {
+        public static void Bar(EmitterContext context)
+        {
+            InstBar op = context.GetOp<InstBar>();
+
+            // TODO: Support other modes.
+            if (op.BarOp == BarOp.Sync)
+            {
+                context.Barrier();
+            }
+            else
+            {
+                context.Config.GpuAccessor.Log($"Invalid barrier mode: {op.BarOp}.");
+            }
+        }
+
+        public static void Depbar(EmitterContext context)
+        {
+            InstDepbar op = context.GetOp<InstDepbar>();
+
+            // No operation.
+        }
+
+        public static void Membar(EmitterContext context)
+        {
+            InstMembar op = context.GetOp<InstMembar>();
+
+            if (op.Membar == Decoders.Membar.Cta)
+            {
+                context.GroupMemoryBarrier();
+            }
+            else
+            {
+                context.MemoryBarrier();
+            }
+        }
+    }
+}