From 1876b346fea647e8284a66bb6d62c38801035cff Mon Sep 17 00:00:00 2001
From: gdk <gab.dark.100@gmail.com>
Date: Sun, 13 Oct 2019 03:02:07 -0300
Subject: Initial work

---
 Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs | 58 +++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs

(limited to 'Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs')

diff --git a/Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs b/Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs
new file mode 100644
index 00000000..77cd1bf7
--- /dev/null
+++ b/Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs
@@ -0,0 +1,58 @@
+using System;
+
+namespace Ryujinx.Graphics.Shader.Decoders
+{
+    static class DecoderHelper
+    {
+        public static int DecodeS20Immediate(long opCode)
+        {
+            int imm = opCode.Extract(20, 19);
+
+            bool sign = opCode.Extract(56);
+
+            if (sign)
+            {
+                imm = (imm << 13) >> 13;
+            }
+
+            return imm;
+        }
+
+        public static int Decode2xF10Immediate(long opCode)
+        {
+            int immH0 = opCode.Extract(20, 9);
+            int immH1 = opCode.Extract(30, 9);
+
+            bool negateH0 = opCode.Extract(29);
+            bool negateH1 = opCode.Extract(56);
+
+            if (negateH0)
+            {
+                immH0 |= 1 << 9;
+            }
+
+            if (negateH1)
+            {
+                immH1 |= 1 << 9;
+            }
+
+            return immH1 << 22 | immH0 << 6;
+        }
+
+        public static float DecodeF20Immediate(long opCode)
+        {
+            int imm = opCode.Extract(20, 19);
+
+            bool negate = opCode.Extract(56);
+
+            imm <<= 12;
+
+            if (negate)
+            {
+                imm |= 1 << 31;
+            }
+
+            return BitConverter.Int32BitsToSingle(imm);
+        }
+    }
+}
\ No newline at end of file
-- 
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