Retrieves the specified texture surface level.
HRESULT GetSurfaceLevel( UINT Level, IDirect3DSurface9 ** ppSurfaceLevel );
If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be one D3DERR_INVALIDCALL.
Calling this method will increase the internal reference count on the IDirect3DSurface9 interface. Failure to call IUnknown::Release when finished using this IDirect3DSurface9 interface results in a memory leak.
Header: Declared in D3d9.h.