From ff2bac9c9042ef23437b19a32f3f2b6869cc1274 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Thu, 12 Mar 2020 22:30:26 -0300
Subject: Implement MME shadow RAM (#987)

---
 Ryujinx.Graphics.Gpu/MacroInterpreter.cs | 39 ++++++++++++++++++++++++--------
 1 file changed, 29 insertions(+), 10 deletions(-)

(limited to 'Ryujinx.Graphics.Gpu/MacroInterpreter.cs')

diff --git a/Ryujinx.Graphics.Gpu/MacroInterpreter.cs b/Ryujinx.Graphics.Gpu/MacroInterpreter.cs
index 4287f055..fa8a4a48 100644
--- a/Ryujinx.Graphics.Gpu/MacroInterpreter.cs
+++ b/Ryujinx.Graphics.Gpu/MacroInterpreter.cs
@@ -45,7 +45,7 @@ namespace Ryujinx.Graphics.Gpu
             BitwiseNotAnd      = 12
         }
 
-        public Queue<int> Fifo { get; private set; }
+        public Queue<int> Fifo { get; }
 
         private int[] _gprs;
 
@@ -62,6 +62,8 @@ namespace Ryujinx.Graphics.Gpu
 
         private int _pc;
 
+        private ShadowRamControl _shadowCtrl;
+
         /// <summary>
         /// Creates a new instance of the macro code interpreter.
         /// </summary>
@@ -78,8 +80,10 @@ namespace Ryujinx.Graphics.Gpu
         /// <param name="mme">Code of the program to execute</param>
         /// <param name="position">Start position to execute</param>
         /// <param name="param">Optional argument passed to the program, 0 if not used</param>
+        /// <param name="shadowCtrl">Shadow RAM control register value</param>
         /// <param name="state">Current GPU state</param>
-        public void Execute(int[] mme, int position, int param, GpuState state)
+        /// <param name="shadowState">Shadow GPU state</param>
+        public void Execute(int[] mme, int position, int param, ShadowRamControl shadowCtrl, GpuState state, GpuState shadowState)
         {
             Reset();
 
@@ -87,13 +91,15 @@ namespace Ryujinx.Graphics.Gpu
 
             _pc = position;
 
+            _shadowCtrl = shadowCtrl;
+
             FetchOpCode(mme);
 
-            while (Step(mme, state));
+            while (Step(mme, state, shadowState));
 
             // Due to the delay slot, we still need to execute
             // one more instruction before we actually exit.
-            Step(mme, state);
+            Step(mme, state, shadowState);
         }
 
         /// <summary>
@@ -118,8 +124,9 @@ namespace Ryujinx.Graphics.Gpu
         /// </summary>
         /// <param name="mme">Program code to execute</param>
         /// <param name="state">Current GPU state</param>
+        /// <param name="shadowState">Shadow GPU state</param>
         /// <returns>True to continue execution, false if the program exited</returns>
-        private bool Step(int[] mme, GpuState state)
+        private bool Step(int[] mme, GpuState state, GpuState shadowState)
         {
             int baseAddr = _pc - 1;
 
@@ -165,7 +172,7 @@ namespace Ryujinx.Graphics.Gpu
                     {
                         SetDstGpr(FetchParam());
 
-                        Send(state, result);
+                        Send(state, shadowState, result);
 
                         break;
                     }
@@ -175,7 +182,7 @@ namespace Ryujinx.Graphics.Gpu
                     {
                         SetDstGpr(result);
 
-                        Send(state, result);
+                        Send(state, shadowState, result);
 
                         break;
                     }
@@ -197,7 +204,7 @@ namespace Ryujinx.Graphics.Gpu
 
                         SetMethAddr(result);
 
-                        Send(state, FetchParam());
+                        Send(state, shadowState, FetchParam());
 
                         break;
                     }
@@ -209,7 +216,7 @@ namespace Ryujinx.Graphics.Gpu
 
                         SetMethAddr(result);
 
-                        Send(state, (result >> 12) & 0x3f);
+                        Send(state, shadowState,(result >> 12) & 0x3f);
 
                         break;
                     }
@@ -482,9 +489,21 @@ namespace Ryujinx.Graphics.Gpu
         /// Performs a GPU method call.
         /// </summary>
         /// <param name="state">Current GPU state</param>
+        /// <param name="shadowState">Shadow GPU state</param>
         /// <param name="value">Call argument</param>
-        private void Send(GpuState state, int value)
+        private void Send(GpuState state, GpuState shadowState, int value)
         {
+            // TODO: Figure out what TrackWithFilter does, compared to Track.
+            if (_shadowCtrl == ShadowRamControl.Track ||
+                _shadowCtrl == ShadowRamControl.TrackWithFilter)
+            {
+                shadowState.Write(_methAddr, value);
+            }
+            else if (_shadowCtrl == ShadowRamControl.Replay)
+            {
+                value = shadowState.Read(_methAddr);
+            }
+
             MethodParams meth = new MethodParams(_methAddr, value);
 
             state.CallMethod(meth);
-- 
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