terrain/Terrain/TerrainViewController.swift

//
//  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 {

    var renderer: Renderer!

    private var metalView: MTKView! {
        return view as? MTKView
    }

    override func loadView() {
        guard let device = MTLCreateSystemDefaultDevice() else {
            fatalError("Couldn't create system default Metal device")
        }
        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
    }

    override func viewDidLoad() {
        renderer = Renderer()
        metalView.delegate = renderer
    }

    override func viewWillAppear() {
        super.viewWillAppear()
        guard let device = metalView.device else {
            return
        }
        renderer.setupMetal(withDevice: device, pixelFormat: metalView.colorPixelFormat)
        renderer.prepareToRender()
    }
    
}