Function glTexSubImage2D 

pub unsafe extern "C" fn glTexSubImage2D(
    target: GLenum,
    level: GLint,
    xoffset: GLint,
    yoffset: GLint,
    width: GLsizei,
    height: GLsizei,
    format: GLenum,
    type_: GLenum,
    pixels: *const c_void,
)