D3D 设备丢失后，什么会一同丢失？

1：Default中加载的资源。这些资源在设备丢失后要手工Release掉,难怪Sprite提供了ID3DXSprite::OnLostDevice

ID3DXSprite::OnLostDevice

Use this method to release all references to video memory resources and delete all stateblocks. This method should be called whenever a device is lost or before resetting a device.

2：RenderState渲染状态，难怪Sprite都提供了ID3DXSprite::OnResetDevice等相关的函数，就是为了恢复渲染状态 .

ID3DXSprite::OnResetDevice

Use this method to re-acquire resources and save initial state.

3:Stencil Buffer,RenderTarget,及显存中的数据会丢，另外，后备缓冲中的数据也会丢。

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