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import SwiftUI
import MetalKit
struct MetalView: NSViewRepresentable {
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func makeNSView(context: NSViewRepresentableContext<MetalView>) -> MTKView {
let mtkView = MTKView()
mtkView.delegate = context.coordinator
mtkView.preferredFramesPerSecond = 60
mtkView.enableSetNeedsDisplay = true
if let metalDevice = MTLCreateSystemDefaultDevice() {
mtkView.device = metalDevice
}
mtkView.framebufferOnly = false
mtkView.clearColor = MTLClearColor(red: 0, green: 0, blue: 0, alpha: 0)
mtkView.drawableSize = mtkView.frame.size
mtkView.enableSetNeedsDisplay = true
mtkView.isPaused = false
return mtkView
}
func updateNSView(_ nsView: MTKView, context: NSViewRepresentableContext<MetalView>) {
}
class Coordinator : NSObject, MTKViewDelegate {
var parent: MetalView
var metalDevice: MTLDevice!
var metalCommandQueue: MTLCommandQueue!
init(_ parent: MetalView) {
self.parent = parent
if let metalDevice = MTLCreateSystemDefaultDevice() {
self.metalDevice = metalDevice
}
self.metalCommandQueue = metalDevice.makeCommandQueue()!
super.init()
}
func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
}
func draw(in view: MTKView) {
guard let drawable = view.currentDrawable else {
return
}
let commandBuffer = metalCommandQueue.makeCommandBuffer()
let rpd = view.currentRenderPassDescriptor
rpd?.colorAttachments[0].clearColor = MTLClearColorMake(0, 0, 0, 1)
rpd?.colorAttachments[0].loadAction = .clear
rpd?.colorAttachments[0].storeAction = .store
let re = commandBuffer?.makeRenderCommandEncoder(descriptor: rpd!)
re?.endEncoding()
commandBuffer?.present(drawable)
commandBuffer?.commit()
}
}
}
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