Geometry shader emulation for macOS (#5551)

* Implement vertex and geometry shader conversion to compute

* Call InitializeReservedCounts for compute too

* PR feedback

* Set clip distance mask for geometry and tessellation shaders too

* Transform feedback emulation only for vertex

src/Ryujinx.Graphics.Shader/Translation/IoUsage.cs

@@ -0,0 +1,28 @@
+namespace Ryujinx.Graphics.Shader.Translation
+{
+    readonly struct IoUsage
+    {
+        private readonly FeatureFlags _usedFeatures;
+
+        public readonly bool UsesRtLayer => _usedFeatures.HasFlag(FeatureFlags.RtLayer);
+        public readonly bool UsesViewportIndex => _usedFeatures.HasFlag(FeatureFlags.ViewportIndex);
+        public readonly bool UsesViewportMask => _usedFeatures.HasFlag(FeatureFlags.ViewportMask);
+        public readonly byte ClipDistancesWritten { get; }
+        public readonly int UserDefinedMap { get; }
+
+        public IoUsage(FeatureFlags usedFeatures, byte clipDistancesWritten, int userDefinedMap)
+        {
+            _usedFeatures = usedFeatures;
+            ClipDistancesWritten = clipDistancesWritten;
+            UserDefinedMap = userDefinedMap;
+        }
+
+        public readonly IoUsage Combine(IoUsage other)
+        {
+            return new IoUsage(
+                _usedFeatures | other._usedFeatures,
+                (byte)(ClipDistancesWritten | other.ClipDistancesWritten),
+                UserDefinedMap | other.UserDefinedMap);
+        }
+    }
+}