Ryujinx/Ryujinx.Graphics.Shader/Decoders/DecoderHelper.cs
gdkchan dc97457bf0
Initial support for double precision shader instructions. (#963)
* Implement DADD, DFMA and DMUL shader instructions

* Rename FP to FP32

* Correct double immediate

* Classic mistake
2020-03-03 15:02:08 +01:00

74 lines
No EOL
1.5 KiB
C#

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);
}
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);
}
}
}