metal_layer

metal_layer.swift

import Cocoa

class MetalLayer: CAMetalLayer {
    unowned var common: MacCommon

    override var device: MTLDevice? {
        didSet{
            if oldValue == nil {
                //clearBuffer()
            }
        }
    }

    init(common com: MacCommon) {
        common = com
        super.init()

        //layer.framebufferOnly = false
        //layer.drawableSize = NSSize(width: 1024, height: 576)
        pixelFormat = .rgba16Float
        backgroundColor = NSColor.black.cgColor

        if #available(macOS 10.13, *) {
            displaySyncEnabled = true
        }
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func clearBuffer() {
        if let device = device, let drawable = nextDrawable() {
            let commandQueue = device.makeCommandQueue()
            let commandBuffer = commandQueue?.makeCommandBuffer()
            let texture = drawable.texture

            let desc = MTLRenderPassDescriptor()
            desc.colorAttachments[0].texture = texture
            desc.colorAttachments[0].loadAction = .clear
            desc.colorAttachments[0].storeAction = .store
            desc.colorAttachments[0].clearColor = MTLClearColorMake(0, 0, 0, 1.0)

            let commandEncoder = commandBuffer?.makeRenderCommandEncoder(descriptor: desc)!
            commandEncoder?.endEncoding()

            commandBuffer?.present(drawable)
            commandBuffer?.commit()
        }
    }
}