在MTKView内绘制文本

Question

我开始从事一个项目，旧的大学使用金属来绘制一些图形。我对金属的经验为零，目前我正在寻找一种快速的解决方案，以便在此MTKView中添加标签，稍后我将学习有关金属的更多信息。

这是代码的最新步骤：

for coordinate in coordinates {
    let circleVertice = CircleVertex(x: coordinate, y: 200, radius: 20)
     rrIntervals += circleVertice.toVertices(perimeterPoints: perimeterPoints)
 }

如您所见，我有一个坐标，它是标签的坐标，它随图形一起移动，直到它离开屏幕为止。例如，我想在此处添加带有"Test"字符串的标签，用此坐标在此MTKView中添加此标签的最佳和最快方法是什么。此代码在MTKView class

的子类中

如果可以在这里帮助我，您将挽救我的生命。谢谢

Answer 1

这是我的项目中的金属设置，@ 0xBFE1A8，您可以帮助我在此设置中实现SKRenderer吗？

    protocol MetalSetupDelegate: class {
   func prepareEncoder(id: String, encoder: MTLRenderCommandEncoder,
                       drawable: CAMetalDrawable, bufferDataSource: BufferDatasource) throws
}

class MetalSetup {

   struct Functions {

      let id: String
      let vertex: String
      let fragment: String

      init(id: String = "default", vertex: String, fragment: String) {
         self.id = id
         self.vertex = vertex
         self.fragment = fragment
      }
   }

   enum Error: Swift.Error {
      case unableToInitialize(String)
   }

   let device: MTLDevice
   let library: MTLLibrary
   let pixelFormat = MTLPixelFormat.bgra8Unorm 
   let commandQueue: MTLCommandQueue
   private var pipelineStates: [String: MTLRenderPipelineState] = [:]
   let bufferDataSource: BufferDatasource
   weak var delegate: MetalSetupDelegate?

   convenience init(device: MTLDevice, functions: Functions) throws {
      try self.init(device: device, functions: [functions])
   }

   init(device: MTLDevice, functions: [Functions]) throws {
      self.device = device
      guard let url = Bundle(for: type(of: self)).url(forResource: "default", withExtension: "metallib") else {
         throw Error.unableToInitialize(String(describing: URL.self))
      }
      library = try device.makeLibrary(filepath: url.path)
      guard let commandQueue = device.makeCommandQueue() else {
         throw Error.unableToInitialize(String(describing: MTLCommandQueue.self))
      }
      self.commandQueue = commandQueue
      bufferDataSource = BufferDatasource(inFlightBuffersCount: 3)

      for function in functions {
         guard let vertexProgram = library.makeFunction(name: function.vertex) else {
            throw Error.unableToInitialize(String(describing: MTLFunction.self))
         }
         guard let fragmentProgram = library.makeFunction(name: function.fragment) else {
            throw Error.unableToInitialize(String(describing: MTLFunction.self))
         }

         let pipelineStateDescriptor = MTLRenderPipelineDescriptor()
         pipelineStateDescriptor.vertexFunction = vertexProgram
         pipelineStateDescriptor.fragmentFunction = fragmentProgram

         pipelineStateDescriptor.colorAttachments[0].pixelFormat = pixelFormat
         let pipelineState = try device.makeRenderPipelineState(descriptor: pipelineStateDescriptor)
         pipelineStates[function.id] = pipelineState
      }
   }

   func render(drawable: CAMetalDrawable, renderPassDescriptor: MTLRenderPassDescriptor) throws {

      guard let delegate = delegate else {
         return
      }

      guard let commandBuffer = commandQueue.makeCommandBuffer() else {
         throw Error.unableToInitialize(String(describing: MTLCommandBuffer.self))
      }

      renderPassDescriptor.colorAttachments[0].loadAction = .clear

      guard let renderEncoder = commandBuffer.makeRenderCommandEncoder(descriptor: renderPassDescriptor) else {
         throw Error.unableToInitialize(String(describing: MTLRenderCommandEncoder.self))
      }

      do {
         bufferDataSource.dispatchWait()
         commandBuffer.label = "Main Command Buffer"
         commandBuffer.addCompletedHandler { [unowned self] _ -> Void in
            self.bufferDataSource.dispatchSignal()
         }

         renderEncoder.label = "Final Pass Encoder"
         for (id, pipelineState) in pipelineStates {
            renderEncoder.pushDebugGroup("Drawing buffers for id: \(id)")
            renderEncoder.setRenderPipelineState(pipelineState)
            try delegate.prepareEncoder(id: id, encoder: renderEncoder, drawable: drawable, bufferDataSource: bufferDataSource)
            renderEncoder.popDebugGroup()
         }

         renderEncoder.endEncoding()

         commandBuffer.present(drawable)
         commandBuffer.commit()
      } catch {
         renderEncoder.endEncoding()
         bufferDataSource.dispatchSignal()
         throw error
      }
   }
}