check it out

(shadow 'char-width)
(use-package :xlib)
(defparameter *mods* '(:mod-1))
(defparameter *move* 1)
(defparameter *resize* 3)
(defparameter *lower* 4)
(defparameter *raise* 5)
(defparameter *display* nil) ; set this to an integer to do testing with xnest

(defun open-default-display (&optional display-name)
"Open a connection to DISPLAY-NAME if supplied, or to the appropriate
default display as given by GET-DEFAULT-DISPLAY otherwise.

OPEN-DISPLAY-NAME always attempts to do display authorization. The
hostname is resolved to an address, then authorization data for the
(protocol, host-address, displaynumber) triple is looked up in the
file given by AUTHORITY_PATHNAME (typically $HOME/.Xauthority). If
the protocol is :local, or if the hostname resolves to the local host,
authority data for the local machine's actual hostname - as returned by
gethostname(3) - is used instead."
(destructuring-bind (host display screen protocol)
(get-default-display display-name)
(declare (ignore screen))
(open-display host :display display :protocol protocol)))

(defun main ()
(let* ((display (if *display*
(open-display "" :display *display*)
(open-default-display)))
(screen (first (display-roots display)))
(root (screen-root screen)))

(dolist (button (list *move* *resize* *lower* *raise*))
(grab-button root button '(:button-press) :modifiers *mods*))

(unwind-protect
(let (last-button last-x last-y)
(do () (nil) ; infinite loop
(event-case (display :discard-p t)
;; for key-press and key-release, code is the keycode
;; for button-press and button-release, code is the button number
(:button-press (code child event-window)
(cond ((= code *raise*)
(circulate-window-up root))
((= code *lower*)
(circulate-window-down root))
((or (= code *move*)
(= code *resize*))
(when child ; do nothing if we're not over a window
(setf last-button code)
(grab-pointer child '(:pointer-motion :button-release))
(let ((lst (multiple-value-list (query-pointer root))))
(setf last-x (sixth lst)
last-y (seventh lst)))))))
(:motion-notify
(event-window root-x root-y)
;; while(XCheckTypedEvent(display, MotionNotify, &ev));
(let ((delta-x (- root-x last-x))
(delta-y (- root-y last-y)))
(cond ((= last-button *move*)
;; (incf (drawable-x event-window) delta-x)
;; (incf (drawable-y event-window) delta-y)
(setf (drawable-x event-window) root-x
(drawable-y event-window) root-y))
((= last-button *resize*)
;; (incf (drawable-width event-window) delta-x)
;; (incf (drawable-height event-window) delta-y)
(setf (drawable-width event-window)
(max 1 (- root-x (drawable-x event-window)))
(drawable-height event-window)
(max 1 (- root-y (drawable-y event-window))))))))
(:button-release ()
(ungrab-pointer display)))))
(dolist (button (list *move* *resize* *lower* *raise*))
(ungrab-button root button :modifiers *mods*))
(close-display display))))

>>1
Looks cool, but X sucks. Fortunately, progress in recent years has almost made X no longer mandatory, except for the fact that AMD, nVidia, and Intel are stuck in the stone age with their binary blob crap that still requires X and would probably cost them each a couple of million dollars in programmer salaries to migrate away from. Eventually, it'll happen, but not currently.

All of the cool kids only care care about OpenGL ES 2.0 (and soon ES 3.0 which is in testing), and you can get decent performance with the open source drivers based around libGL-mesa. For fullscreen graphics that works from a terminal without a window manager, use udev + libdrm + EGL + OpenGL ES 2.0 directly. For Windowed graphics, build and install Wayland and then use Wayland + EGL + OpenGL ES 2.0.

https://upload.wikimedia.org/wikipedia/commons/2/2d/The_Linux_Graphics_Stack_and_glamor.svg