Function gl::GetnSeparableFilter

pub unsafe fn GetnSeparableFilter(target: GLenum,
                                  format: GLenum,
                                  type_: GLenum,
                                  rowBufSize: GLsizei,
                                  row: *mut c_void,
                                  columnBufSize: GLsizei,
                                  column: *mut c_void,
                                  span: *mut c_void)