我应该如何在Metal中渲染文本？

import MetalKit

class ViewController: UIViewController, MTKViewDelegate {
    var device: MTLDevice!
    var commandQueue: MTLCommandQueue!
    var pipelineState: MTLRenderPipelineState!
    var vertexBuffer: MTLBuffer!
    var uniformBuffer: MTLBuffer!
    var texture: MTLTexture!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建MTKView
        let metalView = MTKView(frame: view.bounds, device: MTLCreateSystemDefaultDevice())
        metalView.delegate = self
        view.addSubview(metalView)
        
        // 初始化Metal相关对象
        device = metalView.device
        commandQueue = device.makeCommandQueue()
        
        // 创建渲染管道
        let library = device.makeDefaultLibrary()
        let vertexFunction = library?.makeFunction(name: "vertexShader")
        let fragmentFunction = library?.makeFunction(name: "fragmentShader")
        let pipelineDescriptor = MTLRenderPipelineDescriptor()
        pipelineDescriptor.vertexFunction = vertexFunction
        pipelineDescriptor.fragmentFunction = fragmentFunction
        pipelineDescriptor.colorAttachments[0].pixelFormat = metalView.colorPixelFormat
        pipelineState = try! device.makeRenderPipelineState(descriptor: pipelineDescriptor)
        
        // 创建顶点数据
        let vertices = [
            TextVertex(position: vector_float2(-1, -1), textureCoordinate: vector_float2(0, 1)),
            TextVertex(position: vector_float2(1, -1), textureCoordinate: vector_float2(1, 1)),
            TextVertex(position: vector_float2(-1, 1), textureCoordinate: vector_float2(0, 0)),
            TextVertex(position: vector_float2(1, 1), textureCoordinate: vector_float2(1, 0))
        ]
        vertexBuffer = device.makeBuffer(bytes: vertices, length: MemoryLayout<TextVertex>.stride * vertices.count, options: [])
        
        // 创建Uniform缓冲区
        let uniforms = Uniforms(modelViewProjectionMatrix: matrix_identity_float4x4)
        uniformBuffer = device.makeBuffer(bytes: &uniforms, length: MemoryLayout<Uniforms>.stride, options: [])
        
        // 创建纹理
        texture = createTextureFromText("Hello, Metal!")
    }
    
    func createTextureFromText(_ text: String) -> MTLTexture {
        // 使用Core Text或其他文本渲染库将文本渲染到纹理中
        // 返回包含文本的纹理对象
    }
    
    func draw(in view: MTKView) {
        guard let drawable = view.currentDrawable,
              let renderPassDescriptor = view.currentRenderPassDescriptor else {
            return
        }
        
        let commandBuffer = commandQueue.makeCommandBuffer()
        let commandEncoder = commandBuffer?.makeRenderCommandEncoder(descriptor: renderPassDescriptor)
        commandEncoder?.setRenderPipelineState(pipelineState)
        commandEncoder?.setVertexBuffer(vertexBuffer, offset: 0, index: 0)
        commandEncoder?.setVertexBuffer(uniformBuffer, offset: 0, index: 1)
        commandEncoder?.setFragmentTexture(texture, index: 0)
        commandEncoder?.drawPrimitives(type: .triangleStrip, vertexStart: 0, vertexCount: 4)
        commandEncoder?.endEncoding()
        
        commandBuffer?.present(drawable)
        commandBuffer?.commit()
    }
    
    func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
        // 处理视图大小变化
    }
}

struct TextVertex {
    var position: vector_float2
    var textureCoordinate: vector_float2
}

struct Uniforms {
    var modelViewProjectionMatrix: matrix_float4x4
}