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/EncoderResources.cs

@@ -0,0 +1,63 @@
+using SharpMetal.Metal;
+using System.Collections.Generic;
+
+namespace Ryujinx.Graphics.Metal
+{
+    public struct RenderEncoderBindings
+    {
+        public List<Resource> Resources = new();
+        public List<BufferResource> VertexBuffers = new();
+        public List<BufferResource> FragmentBuffers = new();
+
+        public RenderEncoderBindings() { }
+
+        public readonly void Clear()
+        {
+            Resources.Clear();
+            VertexBuffers.Clear();
+            FragmentBuffers.Clear();
+        }
+    }
+
+    public struct ComputeEncoderBindings
+    {
+        public List<Resource> Resources = new();
+        public List<BufferResource> Buffers = new();
+
+        public ComputeEncoderBindings() { }
+
+        public readonly void Clear()
+        {
+            Resources.Clear();
+            Buffers.Clear();
+        }
+    }
+
+    public struct BufferResource
+    {
+        public MTLBuffer Buffer;
+        public ulong Offset;
+        public ulong Binding;
+
+        public BufferResource(MTLBuffer buffer, ulong offset, ulong binding)
+        {
+            Buffer = buffer;
+            Offset = offset;
+            Binding = binding;
+        }
+    }
+
+    public struct Resource
+    {
+        public MTLResource MtlResource;
+        public MTLResourceUsage ResourceUsage;
+        public MTLRenderStages Stages;
+
+        public Resource(MTLResource resource, MTLResourceUsage resourceUsage, MTLRenderStages stages)
+        {
+            MtlResource = resource;
+            ResourceUsage = resourceUsage;
+            Stages = stages;
+        }
+    }
+}