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using OpenTK.Graphics.OpenGL;
using Ryujinx.Common.Logging;
using System;
using System.Runtime.InteropServices;
using System.Threading;
namespace Ryujinx.Graphics.OpenGL.Queries
{
class BufferedQuery : IDisposable
{
private const int MaxQueryRetries = 5000;
private const long DefaultValue = -1;
private const ulong HighMask = 0xFFFFFFFF00000000;
public int Query { get; }
private readonly int _buffer;
private readonly IntPtr _bufferMap;
private readonly QueryTarget _type;
public BufferedQuery(QueryTarget type)
{
_buffer = GL.GenBuffer();
Query = GL.GenQuery();
_type = type;
GL.BindBuffer(BufferTarget.QueryBuffer, _buffer);
unsafe
{
long defaultValue = DefaultValue;
GL.BufferStorage(BufferTarget.QueryBuffer, sizeof(long), (IntPtr)(&defaultValue), BufferStorageFlags.MapReadBit | BufferStorageFlags.MapWriteBit | BufferStorageFlags.MapPersistentBit);
}
_bufferMap = GL.MapBufferRange(BufferTarget.QueryBuffer, IntPtr.Zero, sizeof(long), BufferAccessMask.MapReadBit | BufferAccessMask.MapWriteBit | BufferAccessMask.MapPersistentBit);
}
public void Reset()
{
GL.EndQuery(_type);
GL.BeginQuery(_type, Query);
}
public void Begin()
{
GL.BeginQuery(_type, Query);
}
public unsafe void End(bool withResult)
{
GL.EndQuery(_type);
if (withResult)
{
GL.BindBuffer(BufferTarget.QueryBuffer, _buffer);
Marshal.WriteInt64(_bufferMap, -1L);
GL.GetQueryObject(Query, GetQueryObjectParam.QueryResult, (long*)0);
GL.MemoryBarrier(MemoryBarrierFlags.QueryBufferBarrierBit | MemoryBarrierFlags.ClientMappedBufferBarrierBit);
}
else
{
// Dummy result, just return 0.
Marshal.WriteInt64(_bufferMap, 0L);
}
}
private static bool WaitingForValue(long data)
{
return data == DefaultValue ||
((ulong)data & HighMask) == (unchecked((ulong)DefaultValue) & HighMask);
}
public bool TryGetResult(out long result)
{
result = Marshal.ReadInt64(_bufferMap);
return !WaitingForValue(result);
}
public long AwaitResult(AutoResetEvent wakeSignal = null)
{
long data = DefaultValue;
if (wakeSignal == null)
{
while (WaitingForValue(data))
{
data = Marshal.ReadInt64(_bufferMap);
}
}
else
{
int iterations = 0;
while (WaitingForValue(data) && iterations++ < MaxQueryRetries)
{
data = Marshal.ReadInt64(_bufferMap);
if (WaitingForValue(data))
{
wakeSignal.WaitOne(1);
}
}
if (iterations >= MaxQueryRetries)
{
Logger.Error?.Print(LogClass.Gpu, $"Error: Query result timed out. Took more than {MaxQueryRetries} tries.");
}
}
return data;
}
public void Dispose()
{
GL.BindBuffer(BufferTarget.QueryBuffer, _buffer);
GL.UnmapBuffer(BufferTarget.QueryBuffer);
GL.DeleteBuffer(_buffer);
GL.DeleteQuery(Query);
}
}
}
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