     fileprivate var glkView: GLKView?
     fileprivate var frameLock: NSLock?
     fileprivate var renderingEnabled: Bool = true
-    fileprivate var clearRenderer = 0
     fileprivate var lastVideoFrame: OTVideoFrame?
-    fileprivate var lastVideoFrameRendered: Bool = true
     fileprivate var displayLinkProxy: DisplayLinkProxy?
     fileprivate var displayLink: CADisplayLink?
     

        yPlane?.deallocate()
        uPlane?.deallocate()
        vPlane?.deallocate()
    }
    
}

        if let fLock = frameLock, let format = frame.format {
            fLock.lock()
            assert(format.pixelFormat == .I420)

            deallocateFrame(lastVideoFrame)
            
            lastVideoFrame = OTVideoFrame(format: format)
            lastVideoFrame?.timestamp = frame.timestamp
            
