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Ryujinx/Ryujinx.Graphics/Shader/Translation/Optimizations/HalfConversion.cs
Alex Barney b2b736abc2 Misc cleanup (#708)
* Fix typos

* Remove unneeded using statements

* Enforce var style more

* Remove redundant qualifiers

* Fix some indentation

* Disable naming warnings on files with external enum names

* Fix build

* Mass find & replace for comments with no spacing

* Standardize todo capitalization and for/if spacing
2019-07-02 04:39:22 +02:00

47 lines
No EOL
1.2 KiB
C#

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);
}
}
}