The fence has not been set.
The fence has been set and has not been hit.
The fence has been processed.
A non-blocking query of fence status is not supported by the implementation.
The states returned by getStatus()
GFXDevice * mDevice
This method will not return until the fence has been processed by the GPU.
This is a non-blocking call to get the status of the fence.
This method inserts the fence into the command buffer.