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ryujinx-final/Ryujinx.Graphics.Texture/PixelConverter.cs

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using System;
using System.Runtime.InteropServices;
using System.Runtime.Intrinsics;
using System.Runtime.Intrinsics.X86;
namespace Ryujinx.Graphics.Texture
{
public static class PixelConverter
{
public unsafe static byte[] ConvertR4G4ToR4G4B4A4(ReadOnlySpan<byte> data)
{
byte[] output = new byte[data.Length * 2];
int start = 0;
if (Sse41.IsSupported)
{
int sizeTrunc = data.Length & ~7;
start = sizeTrunc;
fixed (byte* inputPtr = data, outputPtr = output)
{
for (ulong offset = 0; offset < (ulong)sizeTrunc; offset += 8)
{
Sse2.Store(outputPtr + offset * 2, Sse41.ConvertToVector128Int16(inputPtr + offset).AsByte());
}
}
}
Span<ushort> outputSpan = MemoryMarshal.Cast<byte, ushort>(output);
for (int i = start; i < data.Length; i++)
{
outputSpan[i] = (ushort)data[i];
}
return output;
}
}
}