Function gl::CompressedTexImage2D

pub unsafe fn CompressedTexImage2D(target: GLenum,
                                   level: GLint,
                                   internalformat: GLenum,
                                   width: GLsizei,
                                   height: GLsizei,
                                   border: GLint,
                                   imageSize: GLsizei,
                                   data: *const c_void)

Fallbacks: CompressedTexImage2DARB