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Metal API SwiftUI view
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| // | |
| // Created by Szymon Błaszczyński on 26/08/2021. | |
| // | |
| import Foundation | |
| import MetalKit | |
| import SwiftUI | |
| struct MetalView: NSViewRepresentable { | |
| func makeCoordinator() -> Coordinator { | |
| Coordinator(self, mtkView: mtkView) | |
| } | |
| typealias NSViewType = MTKView | |
| var mtkView: MTKView | |
| func makeNSView(context: NSViewRepresentableContext<MetalView>) -> MTKView { | |
| mtkView.delegate = context.coordinator | |
| mtkView.preferredFramesPerSecond = 60 | |
| mtkView.enableSetNeedsDisplay = true | |
| mtkView.isPaused = false | |
| mtkView.colorPixelFormat = MTLPixelFormat.bgra8Unorm | |
| return mtkView | |
| } | |
| func updateNSView(_ nsView: MTKView, context: NSViewRepresentableContext<MetalView>) { | |
| } | |
| class Coordinator: NSObject, MTKViewDelegate { | |
| var parent: MetalView | |
| var ciContext: CIContext! | |
| var metalDevice: MTLDevice! | |
| var metalCommandQueue: MTLCommandQueue! | |
| var mtlTexture: MTLTexture! | |
| var startTime: Date! | |
| init(_ parent: MetalView, mtkView: MTKView) { | |
| self.parent = parent | |
| if let metalDevice = MTLCreateSystemDefaultDevice() { | |
| mtkView.device = metalDevice | |
| self.metalDevice = metalDevice | |
| } | |
| self.ciContext = CIContext(mtlDevice: metalDevice) | |
| self.metalCommandQueue = metalDevice.makeCommandQueue()! | |
| super.init() | |
| mtkView.framebufferOnly = false | |
| mtkView.clearColor = MTLClearColor(red: 0, green: 0, blue: 0, alpha: 0) | |
| mtkView.drawableSize = mtkView.frame.size | |
| mtkView.enableSetNeedsDisplay = true | |
| } | |
| func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) { | |
| } | |
| func draw(in view: MTKView) { | |
| guard let drawable = view.currentDrawable else { | |
| return | |
| } | |
| let texture: MTLTexture = drawable.texture | |
| let passDescriptor = view.currentRenderPassDescriptor | |
| passDescriptor?.colorAttachments[0].texture = texture | |
| passDescriptor?.colorAttachments[0].loadAction = .clear | |
| passDescriptor?.colorAttachments[0].storeAction = .store | |
| passDescriptor?.colorAttachments[0].clearColor = MTLClearColorMake(1, 0, 0, 1) | |
| let commandQueue = metalDevice.makeCommandQueue()! | |
| let commandBuffer = commandQueue.makeCommandBuffer()! | |
| let commandEncoder = commandBuffer.makeRenderCommandEncoder(descriptor: passDescriptor!) | |
| commandEncoder?.endEncoding() | |
| commandBuffer.present(drawable) | |
| commandBuffer.commit() | |
| } | |
| } | |
| } |
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Usage:
MetalView(mtkView: MTKView()in your SwiftUI body