Ryujinx/Ryujinx.Audio/Renderer/Utils/SpanMemoryManager.cs

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//
// Copyright (c) 2019-2021 Ryujinx
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
using System;
using System.Buffers;
using System.Runtime.InteropServices;
namespace Ryujinx.Audio.Renderer.Utils
{
public sealed unsafe class SpanMemoryManager<T> : MemoryManager<T>
where T : unmanaged
{
private readonly T* _pointer;
private readonly int _length;
public SpanMemoryManager(Span<T> span)
{
fixed (T* ptr = &MemoryMarshal.GetReference(span))
{
_pointer = ptr;
_length = span.Length;
}
}
public override Span<T> GetSpan() => new Span<T>(_pointer, _length);
public override MemoryHandle Pin(int elementIndex = 0)
{
if (elementIndex < 0 || elementIndex >= _length)
{
throw new ArgumentOutOfRangeException(nameof(elementIndex));
}
return new MemoryHandle(_pointer + elementIndex);
}
public override void Unpin() { }
protected override void Dispose(bool disposing) { }
public static Memory<T> Cast<TFrom>(Memory<TFrom> memory) where TFrom : unmanaged
{
return new SpanMemoryManager<T>(MemoryMarshal.Cast<TFrom, T>(memory.Span)).Memory;
}
}
}