The IDirect3DDevice2::GetRenderState method gets a single Direct3D Device rendering state parameter.
HRESULT GetRenderState(
  D3DRENDERSTATETYPE dwRenderStateType,  
  LPDWORD lpdwRenderState                
);
 If the method succeeds, the return value is DD_OK.
If the method fails, the return value is an error. The method returns DDERR_INVALIDPARAMS if one of the arguments is invalid.
This method was introduced with the IDirect3DDevice2 interface.
  Windows NT: Use version 5.0 or later.
  Windows: Use Windows 95 or later. Available as a redistributable for Windows 95.
  Windows CE: Unsupported.
  Header: Declared in d3d.h.
  Import Library: Use ddraw.lib.
IDirect3DDevice2::SetRenderState