图形设备是否使用多线程渲染？（只读）
在许多平台上，Unity 可以使用多线程渲染，
其中对底层图形 API 的实际调用是在单独的线程上完成的。
通常，您不必关心这一点，除非您要创建的是本机代码渲染插件。在这种情况下，您需要确保您的插件也在正确的线程上进行渲染调用；
请使用 GL.IssuePluginEvent 执行该操作。
另请参阅：GL.IssuePluginEvent、原生插件接口。
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