From 8ac53c66b4e58c9793f3c1c894679d04604a99c8 Mon Sep 17 00:00:00 2001
From: Isaac Marovitz <42140194+IsaacMarovitz@users.noreply.github.com>
Date: Wed, 14 Dec 2022 19:13:23 -0500
Subject: [PATCH] Remove Half Conversion (#4106)

* Remove HalfConversion

* Update `CodeGenVersion`
---
 .../Shader/DiskCache/DiskCacheHostStorage.cs  |  2 +-
 .../Optimizations/ConstantFolding.cs          |  2 +-
 .../Optimizations/HalfConversion.cs           | 47 -------------------
 3 files changed, 2 insertions(+), 49 deletions(-)
 delete mode 100644 Ryujinx.Graphics.Shader/Translation/Optimizations/HalfConversion.cs

diff --git a/Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheHostStorage.cs b/Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheHostStorage.cs
index e337dd9c..bdc6f4d6 100644
--- a/Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheHostStorage.cs
+++ b/Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheHostStorage.cs
@@ -22,7 +22,7 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
         private const ushort FileFormatVersionMajor = 1;
         private const ushort FileFormatVersionMinor = 2;
         private const uint FileFormatVersionPacked = ((uint)FileFormatVersionMajor << 16) | FileFormatVersionMinor;
-        private const uint CodeGenVersion = 4069;
+        private const uint CodeGenVersion = 4106;
 
         private const string SharedTocFileName = "shared.toc";
         private const string SharedDataFileName = "shared.data";
diff --git a/Ryujinx.Graphics.Shader/Translation/Optimizations/ConstantFolding.cs b/Ryujinx.Graphics.Shader/Translation/Optimizations/ConstantFolding.cs
index 092e52a9..ab33da19 100644
--- a/Ryujinx.Graphics.Shader/Translation/Optimizations/ConstantFolding.cs
+++ b/Ryujinx.Graphics.Shader/Translation/Optimizations/ConstantFolding.cs
@@ -262,7 +262,7 @@ namespace Ryujinx.Graphics.Shader.Translation.Optimizations
 
             value = (value >> operation.Index * 16) & 0xffff;
 
-            operation.TurnIntoCopy(ConstF(HalfConversion.HalfToSingle(value)));
+            operation.TurnIntoCopy(ConstF((float)BitConverter.UInt16BitsToHalf((ushort)value)));
         }
 
         private static void FPNegate(Operation operation)
diff --git a/Ryujinx.Graphics.Shader/Translation/Optimizations/HalfConversion.cs b/Ryujinx.Graphics.Shader/Translation/Optimizations/HalfConversion.cs
deleted file mode 100644
index 96060272..00000000
--- a/Ryujinx.Graphics.Shader/Translation/Optimizations/HalfConversion.cs
+++ /dev/null
@@ -1,47 +0,0 @@
-using System;
-
-namespace Ryujinx.Graphics.Shader.Translation.Optimizations
-{
-    static class HalfConversion
-    {
-        public static float HalfToSingle(int value)
-        {
-            int mantissa = (value >> 0)  & 0x3ff;
-            int exponent = (value >> 10) & 0x1f;
-            int sign     = (value >> 15) & 0x1;
-
-            if (exponent == 0x1f)
-            {
-                // NaN or Infinity.
-                mantissa <<= 13;
-                exponent   = 0xff;
-            }
-            else if (exponent != 0 || mantissa != 0 )
-            {
-                if (exponent == 0)
-                {
-                    // Denormal.
-                    int e = -1;
-                    int m = mantissa;
-
-                    do
-                    {
-                        e++;
-                        m <<= 1;
-                    }
-                    while ((m & 0x400) == 0);
-
-                    mantissa = m & 0x3ff;
-                    exponent = e;
-                }
-
-                mantissa <<= 13;
-                exponent   = 127 - 15 + exponent;
-            }
-
-            int output = (sign << 31) | (exponent << 23) | mantissa;
-
-            return BitConverter.Int32BitsToSingle(output);
-        }
-    }
-}
\ No newline at end of file