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using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace Ryujinx.Graphics.GAL
{
public readonly unsafe struct PinnedSpan<T> : IDisposable where T : unmanaged
{
private readonly void* _ptr;
private readonly int _size;
private readonly Action _disposeAction;
/// <summary>
/// Creates a new PinnedSpan from an existing ReadOnlySpan. The span *must* be pinned in memory.
/// The data must be guaranteed to live until disposeAction is called.
/// </summary>
/// <param name="span">Existing span</param>
/// <param name="disposeAction">Action to call on dispose</param>
/// <remarks>
/// If a dispose action is not provided, it is safe to assume the resource will be available until the next call.
/// </remarks>
public static PinnedSpan<T> UnsafeFromSpan(ReadOnlySpan<T> span, Action disposeAction = null)
{
return new PinnedSpan<T>(Unsafe.AsPointer(ref MemoryMarshal.GetReference(span)), span.Length, disposeAction);
}
/// <summary>
/// Creates a new PinnedSpan from an existing unsafe region. The data must be guaranteed to live until disposeAction is called.
/// </summary>
/// <param name="ptr">Pointer to the region</param>
/// <param name="size">The total items of T the region contains</param>
/// <param name="disposeAction">Action to call on dispose</param>
/// <remarks>
/// If a dispose action is not provided, it is safe to assume the resource will be available until the next call.
/// </remarks>
public PinnedSpan(void* ptr, int size, Action disposeAction = null)
{
_ptr = ptr;
_size = size;
_disposeAction = disposeAction;
}
public ReadOnlySpan<T> Get()
{
return new ReadOnlySpan<T>(_ptr, _size * Unsafe.SizeOf<T>());
}
public void Dispose()
{
_disposeAction?.Invoke();
}
}
}
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