Allegro 5 game programming library bindings for Common Lisp
1cl-liballegroInterface and bindings to the Allegro 5 game programming library
(al:rest-time secs)because of symbol interference with #'cl:rest.
- Enums/constants are shortened, check constants if you need help finding them.
- Type names have changed too, check types if you need help finding them.
- To access slots from a C struct, you can use CFFI:MEM-REF create a plist
(defcstruct display-mode (width :int) (height :int) (format :int) (refresh-rate :int)) (with-foreign-object (test '(:struct display-mode)) (let ((plist (mem-ref test '(:struct display-mode)))) (print plist) (print (getf plist 'width))))
- I've got a neat OPTIONAL lispy interface here which provides an entire fixed timestep game loop
- Everything else is pretty much 1-to-1
- If you're getting crashes on MacOS, put all your code into callback and pass it to al:run-main.
- Examples exist if you get lost
Feel free to raise an issue to request a feature or for me to work on something
4FunctionalityPretty much complete except:
I won't work on the following sections because Common Lisp has more suitable implementations unless there's a usecase or I'm bored.
5.1(More found under gh-pages branch)https://resttime.github.io/cl-liballegro/
5.2Why can't my program find the DLL in Windows?
There are path problems in Windows because the DLL files (which contain all the functions the CFFI calls upon) doesn't have a default location unlike in Unix environments. When the library loads in Windows, it will look for the DLL in the current folder of the FILE.LISP that evaluates (ql:quickload "cl-liballegro") This means you must have a copy of the DLL file in the directory of FILE.LISP, not in the cl-liballegro directory unless the FILE.LISP is in there. SLIME however, likes to change the default search folder to the one Emacs is in when it starts.
;; Open command prompt in the folder that contains both the DLL and game.lisp` > sbcl > (load "game.lisp") ; File contains (ql:quickload "cl-liballegro")
5.2.2With Emacs + SLIMEgame.lisp contains (ql:quickload :cl-liballegro)
;; Looks for the DLL at /path/to/Desktop/allegro.dll C-x C-f /path/to/Desktop/file9.lisp M-x slime C-x C-f /path/to/Desktop/game/game.lisp C-c C-l
;; Looks for the DLL at /path/to/Desktop/game/allegro.dll C-x C-f /path/to/Desktop/file9.lisp C-x C-f /path/to/Desktop/game/game.lisp M-x slime C-c C-l
;; Looks for the DLL at /whatever/default/emacs/directory/allegro.dll M-x slime C-x C-f /path/to/Desktop/game/game.lisp C-c C-l