EXPERIMENTAL: Metal backend (#441)

This is not a continuation of the Metal backend; this is simply bringing
the branch up to date and merging it as-is behind an experiment.

---------

Co-authored-by: Isaac Marovitz <isaacryu@icloud.com>
Co-authored-by: Samuliak <samuliak77@gmail.com>
Co-authored-by: SamoZ256 <96914946+SamoZ256@users.noreply.github.com>
Co-authored-by: Isaac Marovitz <42140194+IsaacMarovitz@users.noreply.github.com>
Co-authored-by: riperiperi <rhy3756547@hotmail.com>
Co-authored-by: Gabriel A <gab.dark.100@gmail.com>

src/Ryujinx.Graphics.Metal/BufferManager.cs

@@ -0,0 +1,237 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.Graphics.GAL;
+using SharpMetal.Metal;
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
+
+namespace Ryujinx.Graphics.Metal
+{
+    [SupportedOSPlatform("macos")]
+    readonly struct ScopedTemporaryBuffer : IDisposable
+    {
+        private readonly BufferManager _bufferManager;
+        private readonly bool _isReserved;
+
+        public readonly BufferRange Range;
+        public readonly BufferHolder Holder;
+
+        public BufferHandle Handle => Range.Handle;
+        public int Offset => Range.Offset;
+
+        public ScopedTemporaryBuffer(BufferManager bufferManager, BufferHolder holder, BufferHandle handle, int offset, int size, bool isReserved)
+        {
+            _bufferManager = bufferManager;
+
+            Range = new BufferRange(handle, offset, size);
+            Holder = holder;
+
+            _isReserved = isReserved;
+        }
+
+        public void Dispose()
+        {
+            if (!_isReserved)
+            {
+                _bufferManager.Delete(Range.Handle);
+            }
+        }
+    }
+
+    [SupportedOSPlatform("macos")]
+    class BufferManager : IDisposable
+    {
+        private readonly IdList<BufferHolder> _buffers;
+
+        private readonly MTLDevice _device;
+        private readonly MetalRenderer _renderer;
+        private readonly Pipeline _pipeline;
+
+        public int BufferCount { get; private set; }
+
+        public StagingBuffer StagingBuffer { get; }
+
+        public BufferManager(MTLDevice device, MetalRenderer renderer, Pipeline pipeline)
+        {
+            _device = device;
+            _renderer = renderer;
+            _pipeline = pipeline;
+            _buffers = new IdList<BufferHolder>();
+
+            StagingBuffer = new StagingBuffer(_renderer, this);
+        }
+
+        public BufferHandle Create(nint pointer, int size)
+        {
+            // TODO: This is the wrong Metal method, we need no-copy which SharpMetal isn't giving us.
+            var buffer = _device.NewBuffer(pointer, (ulong)size, MTLResourceOptions.ResourceStorageModeShared);
+
+            if (buffer == IntPtr.Zero)
+            {
+                Logger.Error?.PrintMsg(LogClass.Gpu, $"Failed to create buffer with size 0x{size:X}, and pointer 0x{pointer:X}.");
+
+                return BufferHandle.Null;
+            }
+
+            var holder = new BufferHolder(_renderer, _pipeline, buffer, size);
+
+            BufferCount++;
+
+            ulong handle64 = (uint)_buffers.Add(holder);
+
+            return Unsafe.As<ulong, BufferHandle>(ref handle64);
+        }
+
+        public BufferHandle CreateWithHandle(int size)
+        {
+            return CreateWithHandle(size, out _);
+        }
+
+        public BufferHandle CreateWithHandle(int size, out BufferHolder holder)
+        {
+            holder = Create(size);
+
+            if (holder == null)
+            {
+                return BufferHandle.Null;
+            }
+
+            BufferCount++;
+
+            ulong handle64 = (uint)_buffers.Add(holder);
+
+            return Unsafe.As<ulong, BufferHandle>(ref handle64);
+        }
+
+        public ScopedTemporaryBuffer ReserveOrCreate(CommandBufferScoped cbs, int size)
+        {
+            StagingBufferReserved? result = StagingBuffer.TryReserveData(cbs, size);
+
+            if (result.HasValue)
+            {
+                return new ScopedTemporaryBuffer(this, result.Value.Buffer, StagingBuffer.Handle, result.Value.Offset, result.Value.Size, true);
+            }
+            else
+            {
+                // Create a temporary buffer.
+                BufferHandle handle = CreateWithHandle(size, out BufferHolder holder);
+
+                return new ScopedTemporaryBuffer(this, holder, handle, 0, size, false);
+            }
+        }
+
+        public BufferHolder Create(int size)
+        {
+            var buffer = _device.NewBuffer((ulong)size, MTLResourceOptions.ResourceStorageModeShared);
+
+            if (buffer != IntPtr.Zero)
+            {
+                return new BufferHolder(_renderer, _pipeline, buffer, size);
+            }
+
+            Logger.Error?.PrintMsg(LogClass.Gpu, $"Failed to create buffer with size 0x{size:X}.");
+
+            return null;
+        }
+
+        public Auto<DisposableBuffer> GetBuffer(BufferHandle handle, bool isWrite, out int size)
+        {
+            if (TryGetBuffer(handle, out var holder))
+            {
+                size = holder.Size;
+                return holder.GetBuffer(isWrite);
+            }
+
+            size = 0;
+            return null;
+        }
+
+        public Auto<DisposableBuffer> GetBuffer(BufferHandle handle, int offset, int size, bool isWrite)
+        {
+            if (TryGetBuffer(handle, out var holder))
+            {
+                return holder.GetBuffer(offset, size, isWrite);
+            }
+
+            return null;
+        }
+
+        public Auto<DisposableBuffer> GetBuffer(BufferHandle handle, bool isWrite)
+        {
+            if (TryGetBuffer(handle, out var holder))
+            {
+                return holder.GetBuffer(isWrite);
+            }
+
+            return null;
+        }
+
+        public Auto<DisposableBuffer> GetBufferI8ToI16(CommandBufferScoped cbs, BufferHandle handle, int offset, int size)
+        {
+            if (TryGetBuffer(handle, out var holder))
+            {
+                return holder.GetBufferI8ToI16(cbs, offset, size);
+            }
+
+            return null;
+        }
+
+        public Auto<DisposableBuffer> GetBufferTopologyConversion(CommandBufferScoped cbs, BufferHandle handle, int offset, int size, IndexBufferPattern pattern, int indexSize)
+        {
+            if (TryGetBuffer(handle, out var holder))
+            {
+                return holder.GetBufferTopologyConversion(cbs, offset, size, pattern, indexSize);
+            }
+
+            return null;
+        }
+
+        public PinnedSpan<byte> GetData(BufferHandle handle, int offset, int size)
+        {
+            if (TryGetBuffer(handle, out var holder))
+            {
+                return holder.GetData(offset, size);
+            }
+
+            return new PinnedSpan<byte>();
+        }
+
+        public void SetData<T>(BufferHandle handle, int offset, ReadOnlySpan<T> data) where T : unmanaged
+        {
+            SetData(handle, offset, MemoryMarshal.Cast<T, byte>(data), null);
+        }
+
+        public void SetData(BufferHandle handle, int offset, ReadOnlySpan<byte> data, CommandBufferScoped? cbs)
+        {
+            if (TryGetBuffer(handle, out var holder))
+            {
+                holder.SetData(offset, data, cbs);
+            }
+        }
+
+        public void Delete(BufferHandle handle)
+        {
+            if (TryGetBuffer(handle, out var holder))
+            {
+                holder.Dispose();
+                _buffers.Remove((int)Unsafe.As<BufferHandle, ulong>(ref handle));
+            }
+        }
+
+        private bool TryGetBuffer(BufferHandle handle, out BufferHolder holder)
+        {
+            return _buffers.TryGetValue((int)Unsafe.As<BufferHandle, ulong>(ref handle), out holder);
+        }
+
+        public void Dispose()
+        {
+            StagingBuffer.Dispose();
+
+            foreach (var buffer in _buffers)
+            {
+                buffer.Dispose();
+            }
+        }
+    }
+}