From dc97457bf0121b9383054ca14d3c525b56b92634 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Tue, 3 Mar 2020 11:02:08 -0300
Subject: Initial support for double precision shader instructions. (#963)

* Implement DADD, DFMA and DMUL shader instructions

* Rename FP to FP32

* Correct double immediate

* Classic mistake
---
 Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

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

diff --git a/Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs b/Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs
index 77cd1bf7..3585c35f 100644
--- a/Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs
+++ b/Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs
@@ -54,5 +54,21 @@ namespace Ryujinx.Graphics.Shader.Decoders
 
             return BitConverter.Int32BitsToSingle(imm);
         }
+
+        public static float DecodeD20Immediate(long opCode)
+        {
+            long imm = opCode.Extract(20, 19);
+
+            bool negate = opCode.Extract(56);
+
+            imm <<= 44;
+
+            if (negate)
+            {
+                imm |= 1L << 63;
+            }
+
+            return (float)BitConverter.Int64BitsToDouble(imm);
+        }
     }
 }
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