|Microsoft DirectX 9.0|
Releases all references to video memory resources and deletes all stateblocks.
If the method succeeds, the return value is S_OK.
If the method fails, the return value can be one of the following values.
D3DERR_INVALIDCALL The method call is invalid. For example, a method's parameter may have an invalid value.
This method should be called whenever the device is lost. Before this object can be used again, the device must be reset and the ID3DXFont::OnResetDevice method called.