在Metal、Swift中设置点的圆形

import MetalKit

// 创建Metal设备和命令队列
guard let device = MTLCreateSystemDefaultDevice(),
      let commandQueue = device.makeCommandQueue() else {
    fatalError("Failed to create Metal device or command queue")
}

// 定义顶点数据
let vertices: [Float] = [
    // x, y, z
    0.0, 0.0, 0.0, // 中心点
    0.0, 0.5, 0.0, // 上方点
    0.5, 0.0, 0.0, // 右方点
    0.0, -0.5, 0.0, // 下方点
    -0.5, 0.0, 0.0 // 左方点
]

// 创建顶点缓冲区
let vertexBuffer = device.makeBuffer(bytes: vertices, length: vertices.count * MemoryLayout<Float>.stride, options: [])

// 创建渲染管道描述符
let pipelineDescriptor = MTLRenderPipelineDescriptor()
pipelineDescriptor.vertexFunction = device.makeDefaultLibrary()?.makeFunction(name: "vertexShader")
pipelineDescriptor.fragmentFunction = device.makeDefaultLibrary()?.makeFunction(name: "fragmentShader")
pipelineDescriptor.colorAttachments[0].pixelFormat = .bgra8Unorm

// 创建渲染管道状态
let pipelineState = try device.makeRenderPipelineState(descriptor: pipelineDescriptor)

// 创建渲染目标描述符
let renderPassDescriptor = MTLRenderPassDescriptor()
renderPassDescriptor.colorAttachments[0].loadAction = .clear
renderPassDescriptor.colorAttachments[0].storeAction = .store
renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 1.0)

// 创建渲染命令缓冲区
guard let commandBuffer = commandQueue.makeCommandBuffer(),
      let renderEncoder = commandBuffer.makeRenderCommandEncoder(descriptor: renderPassDescriptor) else {
    fatalError("Failed to create command buffer or render encoder")
}

// 设置渲染管道状态
renderEncoder.setRenderPipelineState(pipelineState)

// 设置顶点缓冲区
renderEncoder.setVertexBuffer(vertexBuffer, offset: 0, index: 0)

// 绘制点的圆形
renderEncoder.drawPrimitives(type: .point, vertexStart: 0, vertexCount: vertices.count / 3)

// 结束编码器和命令缓冲区
renderEncoder.endEncoding()
commandBuffer.present(drawable.currentDrawable!)
commandBuffer.commit()