Function glCompressedTexImage2D 

pub unsafe extern "C" fn glCompressedTexImage2D(
    target: GLenum,
    level: GLint,
    internalformat: GLenum,
    width: GLsizei,
    height: GLsizei,
    border: GLint,
    imageSize: GLsizei,
    data: *const c_void,
)