__init__.py 文件源码

def set_vsync(self, vsync):
        """Enable or disable vertical sync control.

        When enabled, this option ensures flips from the back to the front
        buffer are performed only during the vertical retrace period of the
        primary display.  This can prevent "tearing" or flickering when
        the buffer is updated in the middle of a video scan.

        Note that LCD monitors have an analogous time in which they are not
        reading from the video buffer; while it does not correspond to
        a vertical retrace it has the same effect.

        With multi-monitor systems the secondary monitor cannot be
        synchronised to, so tearing and flicker cannot be avoided when the
        window is positioned outside of the primary display.  In this case
        it may be advisable to forcibly reduce the framerate (for example,
        using `pyglet.clock.set_fps_limit`).

        :Parameters:
            `vsync` : bool
                If True, vsync is enabled, otherwise it is disabled.

        """
        raise NotImplementedError('abstract')