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ryujinx-fork/Ryujinx.Common/Utilities/Buffers.cs
Alex Barney d1ab9fb42c ASTC optimizations (#845)
* ASTC optimizations

* Move code to Ryujinx.Common

* Support 3D textures

* Address feedback

* Remove ASTC logging

* Use stackalloc instead of a Buffer20 struct

* Code style and cleanup

* Respond to feedback

* Rearrange public/private property ordering
2020-01-09 02:13:00 +01:00

59 lines
1.9 KiB
C#

using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace Ryujinx.Common.Utilities
{
[DebuggerDisplay("{ToString()}")]
[StructLayout(LayoutKind.Sequential, Size = 16)]
public struct Buffer16
{
[DebuggerBrowsable(DebuggerBrowsableState.Never)] private ulong _dummy0;
[DebuggerBrowsable(DebuggerBrowsableState.Never)] private ulong _dummy1;
public byte this[int i]
{
get => Bytes[i];
set => Bytes[i] = value;
}
public Span<byte> Bytes => SpanHelpers.AsByteSpan(ref this);
// Prevent a defensive copy by changing the read-only in reference to a reference with Unsafe.AsRef()
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static implicit operator Span<byte>(in Buffer16 value)
{
return SpanHelpers.AsByteSpan(ref Unsafe.AsRef(in value));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static implicit operator ReadOnlySpan<byte>(in Buffer16 value)
{
return SpanHelpers.AsReadOnlyByteSpan(ref Unsafe.AsRef(in value));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public ref T As<T>() where T : unmanaged
{
if (Unsafe.SizeOf<T>() > (uint)Unsafe.SizeOf<Buffer16>())
{
throw new ArgumentException();
}
return ref MemoryMarshal.GetReference(AsSpan<T>());
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public Span<T> AsSpan<T>() where T : unmanaged
{
return SpanHelpers.AsSpan<Buffer16, T>(ref this);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public readonly ReadOnlySpan<T> AsReadOnlySpan<T>() where T : unmanaged
{
return SpanHelpers.AsReadOnlySpan<Buffer16, T>(ref Unsafe.AsRef(in this));
}
}
}