如何确定MTLTextureDescriptor的最大允许大小

import Metal

func getMaxAllowableTextureSize() -> MTLSize {
    let device = MTLCreateSystemDefaultDevice()!
    let maxTextureSize = device.maxTextureSize
    let maxTextureLayers = device.maxTextureLayers
    let maxTexturePixels = device.maxTexture2DArrayLayers * maxTextureSize * maxTextureSize
    
    let textureFormat = MTLPixelFormat.rgba8Unorm // 选择合适的纹理格式
    
    // 计算最大允许的纹理尺寸
    let maxAllowableSize = min(maxTextureSize, Int(sqrt(Double(maxTexturePixels))), maxTextureLayers)
    
    let textureDescriptor = MTLTextureDescriptor.texture2DDescriptor(pixelFormat: textureFormat, width: maxAllowableSize, height: maxAllowableSize, mipmapped: false)
    
    return MTLSize(width: textureDescriptor.width, height: textureDescriptor.height, depth: textureDescriptor.arrayLength)
}

let maxAllowableSize = getMaxAllowableTextureSize()
print("Max allowable texture size: \(maxAllowableSize.width) x \(maxAllowableSize.height) x \(maxAllowableSize.depth)")