Initial tessellation shader support (#2534)

* Initial tessellation shader support

* Nits

* Re-arrange built-in table

* This is not needed anymore

* PR feedback

Ryujinx.Graphics.Shader/TessPatchType.cs

@@ -0,0 +1,22 @@
+namespace Ryujinx.Graphics.Shader
+{
+    public enum TessPatchType
+    {
+        Isolines = 0,
+        Triangles = 1,
+        Quads = 2
+    }
+
+    static class TessPatchTypeExtensions
+    {
+        public static string ToGlsl(this TessPatchType type)
+        {
+            return type switch
+            {
+                TessPatchType.Isolines => "isolines",
+                TessPatchType.Quads => "quads",
+                _ => "triangles"
+            };
+        }
+    }
+}