//
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// Renderer.swift
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// LiveProject
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// 渲染工具
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// Created by 倪路朋 on 6/26/25.
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//
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import Foundation
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import Metal
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import MetalKit
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import AVFoundation
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class MetalRenderer: NSObject, MTKViewDelegate {
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private let device: MTLDevice
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private let commandQueue: MTLCommandQueue
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private let ciContext: CIContext
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private var currentPixelBuffer: CVPixelBuffer?
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private let textureCache: CVMetalTextureCache
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init(mtkView: MTKView) {
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guard let device = MTLCreateSystemDefaultDevice(),
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let commandQueue = device.makeCommandQueue() else {
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fatalError("Unable to create Metal device or command queue")
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}
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self.device = device
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self.commandQueue = commandQueue
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self.ciContext = CIContext(mtlDevice: device)
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var tmpCache: CVMetalTextureCache?
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CVMetalTextureCacheCreate(nil, nil, device, nil, &tmpCache)
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guard let textureCache = tmpCache else {
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fatalError("Unable to create texture cache")
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}
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self.textureCache = textureCache
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super.init()
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// ✅ 设置驱动渲染的关键代码
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mtkView.device = device
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mtkView.framebufferOnly = false
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mtkView.isPaused = false
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mtkView.enableSetNeedsDisplay = false
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mtkView.delegate = self
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print("MetalRenderer init")
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}
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func draw(in view: MTKView) {
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let size = view.drawableSize
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//print("🧾 drawableSize = \(size)")
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if !size.width.isFinite || !size.height.isFinite || size.width <= 0 || size.height <= 0 {
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print("❌ 非法尺寸，跳过渲染 \(size)")
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return
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}
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guard let drawable = view.currentDrawable,
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let commandBuffer = commandQueue.makeCommandBuffer(),
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let pixelBuffer = currentPixelBuffer else {
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return
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}
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let drawableSize = view.drawableSize
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guard drawableSize.width > 0, drawableSize.height > 0 else { return }
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// 加方向修正：顺时针旋转90度
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var ciImage = CIImage(cvPixelBuffer: pixelBuffer).oriented(.right)
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// 等比缩放后居中
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let sourceExtent = ciImage.extent
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let scaleX = drawableSize.width / sourceExtent.width
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let scaleY = drawableSize.height / sourceExtent.height
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let scale = min(scaleX, scaleY)
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let scaledImage = ciImage.transformed(by: CGAffineTransform(scaleX: scale, y: scale))
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let xOffset = (drawableSize.width - scaledImage.extent.width) / 2
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let yOffset = (drawableSize.height - scaledImage.extent.height) / 2
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let translatedImage = scaledImage.transformed(by: CGAffineTransform(translationX: xOffset, y: yOffset))
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// 渲染
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ciContext.render(translatedImage,
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to: drawable.texture,
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commandBuffer: commandBuffer,
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bounds: CGRect(origin: .zero, size: drawableSize),
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colorSpace: CGColorSpaceCreateDeviceRGB())
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commandBuffer.present(drawable)
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commandBuffer.commit()
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//print("绘制画面")
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}
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func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) {
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// No-op: Handle size change if needed
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}
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func display(pixelBuffer: CVPixelBuffer) {
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self.currentPixelBuffer = pixelBuffer
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//print("display")
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//刷新
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}
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}
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