Set the effect state manager.
HRESULT SetStateManager( LPD3DXEFFECTSTATEMANAGER pManager );
If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be one of the following: D3DERR_INVALIDCALL, D3DXERR_INVALIDDATA.
The ID3DXEffectStateManager is a user-implemented interface that furnishes callbacks into an application for setting device state from an effect.
Header: Declared in D3dx9effect.h.