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Ryujinx/Ryujinx.Graphics/Vic/StructUnpacker.cs
gdkchan c86aacde76
NVDEC implementation using FFmpeg (#443)
* Initial nvdec implementation using FFmpeg

* Fix swapped channels on the video decoder and the G8R8 texture format

* Fix texture samplers not being set properly (regression)

* Rebased

* Remove unused code introduced on the rebase

* Add support for RGBA8 output format on the video image composer

* Correct spacing

* Some fixes for rebase and other tweaks

* Allow size mismatch on frame copy

* Get rid of GetHostAddress calls on VDec
2018-12-03 00:38:47 -02:00

69 lines
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1.4 KiB
C#

using Ryujinx.Graphics.Memory;
using System;
namespace Ryujinx.Graphics.Vic
{
class StructUnpacker
{
private NvGpuVmm Vmm;
private long Position;
private ulong Buffer;
private int BuffPos;
public StructUnpacker(NvGpuVmm Vmm, long Position)
{
this.Vmm = Vmm;
this.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;
}
}
}
}