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