Implement a Macro JIT (#1445)

* Implement a Macro JIT

* Nit: space

Ryujinx.Graphics.Gpu/Engine/MME/MacroJitContext.cs

@@ -0,0 +1,57 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.Graphics.Gpu.State;
+using System.Collections.Generic;
+
+namespace Ryujinx.Graphics.Gpu.Engine.MME
+{
+    /// <summary>
+    /// Represents a Macro Just-in-Time compiler execution context.
+    /// </summary>
+    class MacroJitContext
+    {
+        /// <summary>
+        /// Arguments FIFO.
+        /// </summary>
+        public Queue<int> Fifo { get; } = new Queue<int>();
+
+        /// <summary>
+        /// Fetches a arguments from the arguments FIFO.
+        /// </summary>
+        /// <returns></returns>
+        public int FetchParam()
+        {
+            if (!Fifo.TryDequeue(out int value))
+            {
+                Logger.PrintWarning(LogClass.Gpu, "Macro attempted to fetch an inexistent argument.");
+
+                return 0;
+            }
+
+            return value;
+        }
+
+        /// <summary>
+        /// Reads data from a GPU register.
+        /// </summary>
+        /// <param name="state">Current GPU state</param>
+        /// <param name="reg">Register offset to read</param>
+        /// <returns>GPU register value</returns>
+        public static int Read(GpuState state, int reg)
+        {
+            return state.Read(reg);
+        }
+
+        /// <summary>
+        /// Performs a GPU method call.
+        /// </summary>
+        /// <param name="value">Call argument</param>
+        /// <param name="state">Current GPU state</param>
+        /// <param name="methAddr">Address, in words, of the method</param>
+        public static void Send(int value, GpuState state, int methAddr)
+        {
+            MethodParams meth = new MethodParams(methAddr, value);
+
+            state.CallMethod(meth);
+        }
+    }
+}