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2025-07-09 3b7521a47ae731f0bf0a922822e4417493489539

 LiveProject/tool/MetalRenderer.swift

@@ -4,35 +4,99 @@
//  渲染工具
//  Created by 倪路朋 on 6/26/25.
//
import CoreVideo
import Foundation
import Metal
import MetalKit
import AVFoundation

class MetalRenderer: NSObject, MTKViewDelegate {
    var device: MTLDevice!
    var commandQueue: MTLCommandQueue!
    private let device: MTLDevice
    private let commandQueue: MTLCommandQueue
    private let ciContext: CIContext

    func setup(view: MTKView) {
        self.device = view.device
        self.commandQueue = device.makeCommandQueue()
        // 初始化 texture、pipeline 等
    private var currentPixelBuffer: CVPixelBuffer?
    private let textureCache: CVMetalTextureCache

    init(mtkView: MTKView) {
        guard let device = MTLCreateSystemDefaultDevice(),
              let commandQueue = device.makeCommandQueue() else {
            fatalError("Unable to create Metal device or command queue")
        }

        self.device = device
        self.commandQueue = commandQueue
        self.ciContext = CIContext(mtlDevice: device)

        var tmpCache: CVMetalTextureCache?
        CVMetalTextureCacheCreate(nil, nil, device, nil, &tmpCache)
        guard let textureCache = tmpCache else {
            fatalError("Unable to create texture cache")
        }
        self.textureCache = textureCache

        super.init()

        // ✅ 设置驱动渲染的关键代码
        mtkView.device = device
        mtkView.framebufferOnly = false
        mtkView.isPaused = false
        mtkView.enableSetNeedsDisplay = false
        mtkView.delegate = self
        print("MetalRenderer init")
    }

    // ✅ 必须实现的方法 1：窗口大小改变时调用
    func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
        // 可以留空或更新视图缩放、渲染区域等
    }

    // ✅ 必须实现的方法 2：每一帧绘制时调用
    func draw(in view: MTKView) {
        guard let drawable = view.currentDrawable,
              let descriptor = view.currentRenderPassDescriptor else { return }
        let size = view.drawableSize
        //print("🧾 drawableSize = \(size)")

        let commandBuffer = commandQueue.makeCommandBuffer()!
        let encoder = commandBuffer.makeRenderCommandEncoder(descriptor: descriptor)!
        // 渲染逻辑，如绘制纹理
        encoder.endEncoding()
        if !size.width.isFinite || !size.height.isFinite || size.width <= 0 || size.height <= 0 {
            print("❌ 非法尺寸，跳过渲染 \(size)")
            return
        }
        guard let drawable = view.currentDrawable,
              let commandBuffer = commandQueue.makeCommandBuffer(),
              let pixelBuffer = currentPixelBuffer else {
            return
        }

        let drawableSize = view.drawableSize
        guard drawableSize.width > 0, drawableSize.height > 0 else { return }

        // 加方向修正：顺时针旋转90度
        var ciImage = CIImage(cvPixelBuffer: pixelBuffer).oriented(.right)

        // 等比缩放后居中
        let sourceExtent = ciImage.extent
        let scaleX = drawableSize.width / sourceExtent.width
        let scaleY = drawableSize.height / sourceExtent.height
        let scale = min(scaleX, scaleY)

        let scaledImage = ciImage.transformed(by: CGAffineTransform(scaleX: scale, y: scale))

        let xOffset = (drawableSize.width - scaledImage.extent.width) / 2
        let yOffset = (drawableSize.height - scaledImage.extent.height) / 2
        let translatedImage = scaledImage.transformed(by: CGAffineTransform(translationX: xOffset, y: yOffset))

        // 渲染
        ciContext.render(translatedImage,
                         to: drawable.texture,
                         commandBuffer: commandBuffer,
                         bounds: CGRect(origin: .zero, size: drawableSize),
                         colorSpace: CGColorSpaceCreateDeviceRGB())

        commandBuffer.present(drawable)
        commandBuffer.commit()
        //print("绘制画面")
    }

    func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
        // No-op: Handle size change if needed
    }

    func display(pixelBuffer: CVPixelBuffer) {
        self.currentPixelBuffer = pixelBuffer
        //print("display")
        //刷新
        
    }
}