Ryujinx/Ryujinx.Graphics.Nvdec/Vic/StructUnpacker.cs

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2020-01-01 01:08:02 +01:00
using Ryujinx.Graphics.Gpu.Memory;
using System;
namespace Ryujinx.Graphics.Vic
{
class StructUnpacker
{
private MemoryAccessor _vmm;
private ulong _position;
private ulong _buffer;
private int _buffPos;
public StructUnpacker(MemoryAccessor vmm, ulong position)
{
_vmm = vmm;
_position = position;
_buffPos = 64;
}
public int Read(int bits)
{
if ((uint)bits > 32)
{
throw new ArgumentOutOfRangeException(nameof(bits));
}
int value = 0;
while (bits > 0)
{
RefillBufferIfNeeded();
int readBits = bits;
int maxReadBits = 64 - _buffPos;
if (readBits > maxReadBits)
{
readBits = maxReadBits;
}
value <<= readBits;
value |= (int)(_buffer >> _buffPos) & (int)(0xffffffff >> (32 - readBits));
_buffPos += readBits;
bits -= readBits;
}
return value;
}
private void RefillBufferIfNeeded()
{
if (_buffPos >= 64)
{
_buffer = _vmm.ReadUInt64(_position);
_position += 8;
_buffPos = 0;
}
}
}
}