- driving example :
  un-textured rotating cube + textured rotating cube + basic repl overlay
  + one command to see repl in perspective + one command to come back to
  orthographic projection.

-----------

- put everything in a trunk directory
- clean source code from use/require/etc
- use finalizers (register a feature when the code uses finalizers?)
- use foreign-parse for some wrapping (it's done by hand atm.).

- event queue
  - make it be thread-safe.
  - it would be great to send events to other chicken instances
  across the network.
  - I don't like how event time-of-dispatching is inserted by user code...

- gl-display
  - register the feature 'gl-display-level-0 or 1
  - '''display:make arguments policy (no args, ...)'''
  - receive all X events
  - resize, expand, maximize, ...
  - with/out border
  - with/out X Shape extension
  - window title
  - utf-8 support
  - support all keyboard keys, uppercases
  - xev like sample
  - joypad support :)
- gl-font
  - font choice
  - font size in pixel
  - dynamically link against libfreetype and use any font
  - gl-font-complete provides freetype code, so no dependencies
  - setter and getter to position it
  - allow choice of font through Xft

- gl-projection : different kind of camera, orthographic projection, ...

Can each of the following be self-contained (no dependence) ?
- csg / gl-repl : write a Chicken Scheme Graphics top-level (just a repl).
  - '''adapt pretty-print for gl-font:pp'''
- (make the repl accessible in SXML ?)
- csg-ed / gl-ed : write an extension for csg to enable source file editing.
  The idea is to be able to write computer graphics applications
  directly from csg; with csg being a part of the applications
  (until one decides the application is complete and csg has not to be
  released with the application).
- gl-gui : see the proposal of Tony.
- gl-gui-ed : gui builder/editor for gl-gui.
- tutorial : based on gl-gui / gl-gui-ed ?
- graphical representation of list...
- pos and evo :)

- documentation : define-foreign-enum is used with a long list of symbols in
  gl-dislay-glx.scm, thus needing libffi.