//
//  MetalView.swift
//  chapter02
//
//  Created by Marius on 1/9/16.
//  Copyright © 2016 Marius Horga. All rights reserved.
//

import MetalKit

class MetalView: MTKView {

    required init(coder: NSCoder) {
        super.init(coder: coder)
        device = MTLCreateSystemDefaultDevice()
    }
    
    override func draw(_ dirtyRect: NSRect) {
        if let drawable = currentDrawable, let rpd = currentRenderPassDescriptor {
            rpd.colorAttachments[0].texture = currentDrawable!.texture
            rpd.colorAttachments[0].clearColor = MTLClearColor(red: 0, green: 0.5, blue: 0.5, alpha: 1)
            rpd.colorAttachments[0].loadAction = .clear
            let commandBuffer = device!.makeCommandQueue()?.makeCommandBuffer()
            let commandEncoder = commandBuffer?.makeRenderCommandEncoder(descriptor: rpd)
            commandEncoder?.endEncoding()
            commandBuffer?.present(drawable)
            commandBuffer?.commit()
        }
    }
}