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Ghostie

Ghostie is a 2D game engine engine for Common Lisp. See the demo here in low-res with shitty colors (anyone know a good screencasting tool for windows?).

The goal of Ghostie is to provide an engine for easily creating beautiful games without making (m)any assumptions about the gameplay itself.

Dependencies

Some of these probably aren't in Quicklisp, so you'll have to put them into your local-projects/. Sorry.

• cl-svg-polygon - Used to convert SVG files into levels.
• glu-tessellate - Used to transform polygons into triangles (for OpenGL rendering).
• clipmunk - My fork of the clipmunk bindings, which wrap the latest versions of the Chipmunk physics library.
• chipmunk-wrapper - Some nice CLOS wrappage around clipmunk that makes the bindings a bit more lispy.

C Libraries

You will need to have Chipmunk physics >= 6.1.3 (compiled with -DCHIPMUNK_FFI) and GLFW installed on your system for Ghostie to run.

Usage

(ql:quickload :ghostie-demo)
(ghostie-demo:start)

This starts the demo level, which is a basic demonstration of a mobile character and interaction with the physics environment. The demo level is tiny for now, but the idea is eventually to create a full-blown game level in the demo.

Key bindings:

• Arrow keys: move character
• a: Add box to simulation (for testing physics)
• l: Reload level from scratch (reset player position, remove any boxes, etc)
• -: Zoom out camera
• =: Zoom in camera
• c: Recompile shaders (allows modification of shaders in-game)
• q: Quit

TODO

This is constantly changing as I figure out what I want to do with Ghostie. For a complete TODO, see the issues list.

Notes

Ghostie requires OpenGL >= 3.3 as it makes use of shaders and some other newer OpenGL extensions that are only available in later versions. Get with the times, man.

Ghostie currently runs everything (game logic/physics/rendering) in one thread. Control is immediately returned to the caller after the thread is spawned.

Ghostie is entirely a work in progress and there is a lot of non-trivial work to do on it, as outlined above. My goal is to not only provide a viable option for 2D game programming in lisp, but make it so easy that armed with a vision and some time, anybody can make a good looking, fun to play game in the best programming language available.