创建像素缓冲区Objective-C

NSOpenGLPixelFormatAttribute attribs[] = {
    NSOpenGLPFAPixelBuffer,NSOpenGLPFANoRecovery,NSOpenGLPFAAccelerated,NSOpenGLPFADepthSize,24,(NSOpenGLPixelFormatAttributE) 0
};

NSOpenGLPixelFormat* format = [[[NSOpenGLPixelFormat alloc] initWithAttributes:attribs] autorelease];
NSOpenGLPixelBuffer* pixBuf = [[NSOpenGLPixelBuffer alloc]
                               initWithTextureTarget: GL_TEXTURE_2D
                               textureInternalFormat: GL_RGBA
                               textureMaxMipMapLevel: 0
                               pixelsWide: 32
                               pixelsHigh: 32];

NSLog(@"pbuf address: %p",pixBuf);

我试图摆弄像素格式和宽度,高度,但似乎没有任何作用.我一再为pixBuf得到零.我在MacOS 10.13上使用Xcode 9.它说NSOpenGLPixelBuffer已被弃用,但它应该仍然有效,对吗？