如何将金属着色器处理的相机捕获调整为全屏？

Question

我想创建一个使用金属着色器的全屏相机应用程序。 当我曾经在我的根视图中使用 AVCaptureVideoPreviewLayer 时，使用设置[videoPreviewLayer.videoGravity =.resizeAspectFill][1]它真的是全屏的，但是当我将我的应用程序切换到 Metal 时，我无法将其调整为超过 1170 x 1560适用于 iPhone 13 专业版。 我根据本手册https://developer.apple.com/documentation/avfoundation/additional_data_capture/avcamfilter_applying_filters_to_a_capture_stream找到的唯一设置是：

let width = CVPixelBufferGetWidth(previewPixelBuffer)

let height = CVPixelBufferGetHeight(previewPixelBuffer)

我对 Metal 完全陌生，所以也许我不能问正确的答案，但是如何将 Metal 纹理调整为全屏尺寸？
// 宽度 = 1170 // 高度 = 1560

private func render() {
    guard let pixelBuffer = self.pixelBuffer else { return }
    var width = CVPixelBufferGetWidth(pixelBuffer)
    var height = CVPixelBufferGetHeight(pixelBuffer)

    
            
    var cvTextureOut: CVMetalTexture?
    print(width)
    print(height)
    CVMetalTextureCacheCreateTextureFromImage(kCFAllocatorDefault, textureCache!, pixelBuffer, nil, .bgra8Unorm, width, height , 0, &cvTextureOut)
    
    guard let cvTexture = cvTextureOut, let inputTexture = CVMetalTextureGetTexture(cvTexture) else {
        fatalError("Failed to create metal textures")
    }
    
    guard let drawable: CAMetalDrawable = self.currentDrawable else { fatalError("Failed to create drawable") }
    
    if let commandQueue = commandQueue, let commandBuffer = commandQueue.makeCommandBuffer(), let computeCommandEncoder = commandBuffer.makeComputeCommandEncoder() {
        computeCommandEncoder.setComputePipelineState(computePipelineState)
        computeCommandEncoder.setTexture(inputTexture, index: 0)
        computeCommandEncoder.setTexture(drawable.texture, index: 1)
        computeCommandEncoder.dispatchThreadgroups(inputTexture.threadGroups(), threadsPerThreadgroup: inputTexture.threadGroupCount())
        computeCommandEncoder.endEncoding()
        commandBuffer.present(drawable)
        commandBuffer.commit()
    }
}