Implement VMNMX shader instruction (#1032)

* Implement VMNMX shader instruction

* No need for the gap on the enum

* Fix typo

4 files changed, 112 insertions, 3 deletions

diff --git a/Ryujinx.Graphics.Shader/Decoders/OpCodeTable.cs b/Ryujinx.Graphics.Shader/Decoders/OpCodeTable.cs
index 3878dd87..4579d650 100644
--- a/Ryujinx.Graphics.Shader/Decoders/OpCodeTable.cs
+++ b/Ryujinx.Graphics.Shader/Decoders/OpCodeTable.cs
@@ -205,6 +205,7 @@ namespace Ryujinx.Graphics.Shader.Decoders
             Set("1101111101001x", InstEmit.Txq,     typeof(OpCodeTex));
             Set("1101111101010x", InstEmit.TxqB,    typeof(OpCodeTex));
             Set("01011111xxxxxx", InstEmit.Vmad,    typeof(OpCodeVideo));
+            Set("0011101xxxxxxx", InstEmit.Vmnmx,   typeof(OpCodeVideo));
             Set("0101000011011x", InstEmit.Vote,    typeof(OpCodeVote));
             Set("0100111xxxxxxx", InstEmit.Xmad,    typeof(OpCodeAluCbuf));
             Set("0011011x00xxxx", InstEmit.Xmad,    typeof(OpCodeAluImm));
diff --git a/Ryujinx.Graphics.Shader/Decoders/OpCodeVideo.cs b/Ryujinx.Graphics.Shader/Decoders/OpCodeVideo.cs
index 15dcfa98..c2bdc22f 100644
--- a/Ryujinx.Graphics.Shader/Decoders/OpCodeVideo.cs
+++ b/Ryujinx.Graphics.Shader/Decoders/OpCodeVideo.cs
@@ -6,19 +6,98 @@ namespace Ryujinx.Graphics.Shader.Decoders
     {
         public Register Rd { get; }
         public Register Ra { get; }
+        public Register Rb { get; }
         public Register Rc { get; }
 
-        public bool SetCondCode { get; protected set; }
-        public bool Saturate    { get; protected set; }
+        public int Immediate { get; }
+
+        public int RaSelection { get; }
+        public int RbSelection { get; }
+
+        public bool SetCondCode { get; }
+
+        public bool HasRb { get; }
+
+        public VideoType RaType { get; }
+        public VideoType RbType { get; }
+
+        public VideoPostOp PostOp { get; }
+
+        public bool DstSigned { get; }
+        public bool Saturate  { get; }
 
         public OpCodeVideo(InstEmitter emitter, ulong address, long opCode) : base(emitter, address, opCode)
         {
             Rd = new Register(opCode.Extract(0,  8), RegisterType.Gpr);
             Ra = new Register(opCode.Extract(8,  8), RegisterType.Gpr);
+            Rb = new Register(opCode.Extract(20, 8), RegisterType.Gpr);
             Rc = new Register(opCode.Extract(39, 8), RegisterType.Gpr);
 
+            RaSelection = opCode.Extract(36, 2);
+            RbSelection = opCode.Extract(28, 2);
+
+            RaType = opCode.Extract(37, 2) switch
+            {
+                2 => VideoType.U16,
+                3 => VideoType.U32,
+                _ => VideoType.U8
+            };
+
+            RbType = opCode.Extract(29, 2) switch
+            {
+                2 => VideoType.U16,
+                3 => VideoType.U32,
+                _ => VideoType.U8
+            };
+
+            if (opCode.Extract(48))
+            {
+                RaType |= VideoType.Signed;
+            }
+
+            if (!opCode.Extract(50))
+            {
+                // Immediate variant.
+                Immediate = opCode.Extract(16, 20);
+
+                RbType = opCode.Extract(49) ? VideoType.S16 : VideoType.U16;
+
+                if (RbType == VideoType.S16)
+                {
+                    Immediate = (Immediate << 12) >> 12;
+                }
+            }
+            else if (opCode.Extract(49))
+            {
+                RbType |= VideoType.Signed;
+            }
+
+            if (RaType == VideoType.U16)
+            {
+                RaSelection &= 1;
+            }
+            else if (RaType == VideoType.U32)
+            {
+                RaSelection = 0;
+            }
+
+            if (RbType == VideoType.U16)
+            {
+                RbSelection &= 1;
+            }
+            else if (RbType == VideoType.U32)
+            {
+                RbSelection = 0;
+            }
+
             SetCondCode = opCode.Extract(47);
-            Saturate    = opCode.Extract(55);
+
+            HasRb = opCode.Extract(50);
+
+            PostOp = (VideoPostOp)opCode.Extract(51, 3);
+
+            DstSigned = opCode.Extract(54);
+            Saturate  = opCode.Extract(55);
         }
     }
 }
\ No newline at end of file
diff --git a/Ryujinx.Graphics.Shader/Decoders/VideoPostOp.cs b/Ryujinx.Graphics.Shader/Decoders/VideoPostOp.cs
new file mode 100644
index 00000000..65891789
--- /dev/null
+++ b/Ryujinx.Graphics.Shader/Decoders/VideoPostOp.cs
@@ -0,0 +1,14 @@
+namespace Ryujinx.Graphics.Shader.Decoders
+{
+    enum VideoPostOp
+    {
+        Mrg16h,
+        Mrg16l,
+        Mrg8b0,
+        Mrg8b2,
+        Acc,
+        Min,
+        Max,
+        Pass
+    }
+}
diff --git a/Ryujinx.Graphics.Shader/Decoders/VideoType.cs b/Ryujinx.Graphics.Shader/Decoders/VideoType.cs
new file mode 100644
index 00000000..7186e7c3
--- /dev/null
+++ b/Ryujinx.Graphics.Shader/Decoders/VideoType.cs
@@ -0,0 +1,15 @@
+namespace Ryujinx.Graphics.Shader.Decoders
+{
+    enum VideoType
+    {
+        U8  = 0,
+        U16 = 1,
+        U32 = 2,
+
+        Signed = 1 << 2,
+
+        S8  = Signed | U8,
+        S16 = Signed | U16,
+        S32 = Signed | U32
+    }
+}