fix bugs

[IwakuraRein]

call m_pRender[m_rndMethod]->destroy() before m_pRender[m_rndMethod]->create(). Otherwise, the previous pipeline and pipeline layout won't be destroyed when a scene is loaded.

add if (m_busy) return; to SampleExample::onKeyboard(). Otherwise, when user is pressing the keyboard while loading the scene, some unpredictable multithread bugs may happen.

Signed-off-by: Alex alexfu@seas.upenn.edu

[IwakuraRein]

Sorry for making this sign-off issue again.

And seems SampleExample::onMouseMotion() has the same problem as SampleExample::onKeyboard(). Adding if (m_busy) return; solved it.

[mklefrancois]

Thanks @IwakuraRein for fix proposals. Can you please check the DCO for the signoff. Thanks