Function glSeparableFilter2D 

pub unsafe extern "C" fn glSeparableFilter2D(
    target: GLenum,
    internalformat: GLenum,
    width: GLsizei,
    height: GLsizei,
    format: GLenum,
    type_: GLenum,
    row: *const GLvoid,
    column: *const GLvoid,
)