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using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using OpenTK.Graphics.OpenGL;
using Ryujinx.Common.Logging;
using Ryujinx.Graphics.GAL;
using Ryujinx.Graphics.OpenGL.Image;
namespace Ryujinx.Graphics.OpenGL
{
class PersistentBuffers : IDisposable
{
private PersistentBuffer _main = new PersistentBuffer();
private PersistentBuffer _background = new PersistentBuffer();
public PersistentBuffer Default => BackgroundContextWorker.InBackground ? _background : _main;
public void Dispose()
{
_main?.Dispose();
_background?.Dispose();
}
}
class PersistentBuffer : IDisposable
{
private IntPtr _bufferMap;
private int _copyBufferHandle;
private int _copyBufferSize;
private byte[] _data;
private IntPtr _dataMap;
private void EnsureBuffer(int requiredSize)
{
if (_copyBufferSize < requiredSize && _copyBufferHandle != 0)
{
GL.DeleteBuffer(_copyBufferHandle);
_copyBufferHandle = 0;
}
if (_copyBufferHandle == 0)
{
_copyBufferHandle = GL.GenBuffer();
_copyBufferSize = requiredSize;
GL.BindBuffer(BufferTarget.CopyWriteBuffer, _copyBufferHandle);
GL.BufferStorage(BufferTarget.CopyWriteBuffer, requiredSize, IntPtr.Zero, BufferStorageFlags.MapReadBit | BufferStorageFlags.MapPersistentBit);
_bufferMap = GL.MapBufferRange(BufferTarget.CopyWriteBuffer, IntPtr.Zero, requiredSize, BufferAccessMask.MapReadBit | BufferAccessMask.MapPersistentBit);
}
}
public unsafe IntPtr GetHostArray(int requiredSize)
{
if (_data == null || _data.Length < requiredSize)
{
_data = GC.AllocateUninitializedArray<byte>(requiredSize, true);
_dataMap = (IntPtr)Unsafe.AsPointer(ref MemoryMarshal.GetArrayDataReference(_data));
}
return _dataMap;
}
private void Sync()
{
GL.MemoryBarrier(MemoryBarrierFlags.ClientMappedBufferBarrierBit);
IntPtr sync = GL.FenceSync(SyncCondition.SyncGpuCommandsComplete, WaitSyncFlags.None);
WaitSyncStatus syncResult = GL.ClientWaitSync(sync, ClientWaitSyncFlags.SyncFlushCommandsBit, 1000000000);
if (syncResult == WaitSyncStatus.TimeoutExpired)
{
Logger.Error?.PrintMsg(LogClass.Gpu, $"Failed to sync persistent buffer state within 1000ms. Continuing...");
}
GL.DeleteSync(sync);
}
public unsafe ReadOnlySpan<byte> GetTextureData(TextureView view, int size)
{
EnsureBuffer(size);
GL.BindBuffer(BufferTarget.PixelPackBuffer, _copyBufferHandle);
view.WriteToPbo(0, false);
GL.BindBuffer(BufferTarget.PixelPackBuffer, 0);
Sync();
return new ReadOnlySpan<byte>(_bufferMap.ToPointer(), size);
}
public unsafe ReadOnlySpan<byte> GetTextureData(TextureView view, int size, int layer, int level)
{
EnsureBuffer(size);
GL.BindBuffer(BufferTarget.PixelPackBuffer, _copyBufferHandle);
int offset = view.WriteToPbo2D(0, layer, level);
GL.BindBuffer(BufferTarget.PixelPackBuffer, 0);
Sync();
return new ReadOnlySpan<byte>(_bufferMap.ToPointer(), size).Slice(offset);
}
public unsafe ReadOnlySpan<byte> GetBufferData(BufferHandle buffer, int offset, int size)
{
EnsureBuffer(size);
GL.BindBuffer(BufferTarget.CopyReadBuffer, buffer.ToInt32());
GL.BindBuffer(BufferTarget.CopyWriteBuffer, _copyBufferHandle);
GL.CopyBufferSubData(BufferTarget.CopyReadBuffer, BufferTarget.CopyWriteBuffer, (IntPtr)offset, IntPtr.Zero, size);
GL.BindBuffer(BufferTarget.CopyWriteBuffer, 0);
Sync();
return new ReadOnlySpan<byte>(_bufferMap.ToPointer(), size);
}
public void Dispose()
{
if (_copyBufferHandle != 0)
{
GL.DeleteBuffer(_copyBufferHandle);
}
}
}
}
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