Set up a TerrainViewController with an MTKView

Terrain/TerrainViewController.swift

@@ -0,0 +1,29 @@
+//
+//  TerrainViewController.swift
+//  Terrain
+//
+//  Created by Eryn Wells on 11/3/18.
+//  Copyright © 2018 Eryn Wells. All rights reserved.
+//
+
+import Cocoa
+import MetalKit
+
+class TerrainViewController: NSViewController {
+
+    private var metalView: MTKView! {
+        return view as? MTKView
+    }
+
+    override func loadView() {
+        guard let device = MTLCreateSystemDefaultDevice() else {
+            return
+        }
+        let v = MTKView(frame: CGRect(), device: device)
+        v.translatesAutoresizingMaskIntoConstraints = false
+        v.widthAnchor.constraint(greaterThanOrEqualToConstant: 640).isActive = true
+        v.heightAnchor.constraint(greaterThanOrEqualToConstant: 480).isActive = true
+        view = v
+    }
+    
+}