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/ResourceLayoutBuilder.cs

@@ -0,0 +1,59 @@
+using Ryujinx.Graphics.GAL;
+using System;
+using System.Collections.Generic;
+using System.Runtime.Versioning;
+
+namespace Ryujinx.Graphics.Metal
+{
+    [SupportedOSPlatform("macos")]
+    class ResourceLayoutBuilder
+    {
+        private const int TotalSets = MetalRenderer.TotalSets;
+
+        private readonly List<ResourceDescriptor>[] _resourceDescriptors;
+        private readonly List<ResourceUsage>[] _resourceUsages;
+
+        public ResourceLayoutBuilder()
+        {
+            _resourceDescriptors = new List<ResourceDescriptor>[TotalSets];
+            _resourceUsages = new List<ResourceUsage>[TotalSets];
+
+            for (int index = 0; index < TotalSets; index++)
+            {
+                _resourceDescriptors[index] = new();
+                _resourceUsages[index] = new();
+            }
+        }
+
+        public ResourceLayoutBuilder Add(ResourceStages stages, ResourceType type, int binding, bool write = false)
+        {
+            uint setIndex = type switch
+            {
+                ResourceType.UniformBuffer => Constants.ConstantBuffersSetIndex,
+                ResourceType.StorageBuffer => Constants.StorageBuffersSetIndex,
+                ResourceType.TextureAndSampler or ResourceType.BufferTexture => Constants.TexturesSetIndex,
+                ResourceType.Image or ResourceType.BufferImage => Constants.ImagesSetIndex,
+                _ => throw new ArgumentException($"Invalid resource type \"{type}\"."),
+            };
+
+            _resourceDescriptors[setIndex].Add(new ResourceDescriptor(binding, 1, type, stages));
+            _resourceUsages[setIndex].Add(new ResourceUsage(binding, 1, type, stages, write));
+
+            return this;
+        }
+
+        public ResourceLayout Build()
+        {
+            var descriptors = new ResourceDescriptorCollection[TotalSets];
+            var usages = new ResourceUsageCollection[TotalSets];
+
+            for (int index = 0; index < TotalSets; index++)
+            {
+                descriptors[index] = new ResourceDescriptorCollection(_resourceDescriptors[index].ToArray().AsReadOnly());
+                usages[index] = new ResourceUsageCollection(_resourceUsages[index].ToArray().AsReadOnly());
+            }
+
+            return new ResourceLayout(descriptors.AsReadOnly(), usages.AsReadOnly());
+        }
+    }
+}