glfw-clj

A wrapper for the excellent GLFW library, on top of the coffi foreign function interface library for Clojure.

This library provides

Installation

This library is available on Clojars, and as a git dependency. You can add a dependency on it with the following configuration in your deps.edn file.

org.suskalo/glfw-clj {:mvn/version "0.1.66"}
io.github.IGJoshua/glfw-clj {:git/tag "v0.1.66" :git/sha "4e6cd6c"}

In addition to the module management needed by coffi, glfw-clj depends on the GLFW library being present on the LD_LIBRARY_PATH.

Usage

General usage of the library follows the usage of GLFW, as the library matches that one closely. See this page if you want help getting started.

Functions are provided in the glfw-clj.core namespace, which is intended to be aliased as glfw.

user=> (require '[glfw-clj.core :as glfw])

Then functions will follow the same names as are in the original library, but without the glfw prefix, and in kebab case. For example the function glfwGetError is provided as glfw-clj.core/get-error.

user=> (glfw/get-error)
nil

In order to be able to use most functionality in the library, it must first be initialized.

user=> (glfw/init)
true

This returns true when it succeeds, and false when it fails for whatever reason.

In general, integers that map to GLFW_TRUE or GLFW_FALSE are replaced with booleans, and integers which map to a given GLFW_SOME_ENUM like GLFW_PRESS are replaced with keywords in the glfw-clj.core namespace. So GLFW_PRESS is mapped to the keyword ::glfw/press.

The set-callback functions take an optional scope parameter, which is a resource scope from coffi. This ensures that the callback is kept around for as long as it will be used. If you don't pass a scope, the global scope will be used. This is generally advisable if you set the callback once at the beginning of your program and don't change it. It's recommended to use this scope even when developing at the REPL to prevent JVM crashes.

Callbacks will catch exceptions that are thrown in them and log them using clojure.tools.logging, before returning an appropriate do-nothing value (at the time of writing, all callbacks return void and therefore nil is used as the return value).

Opaque objects like the window, monitor, and cursor objects are represented as pointers.

Docstrings are provided for all functions, but are there as reminder text, not a replacement for the main GLFW documentation. When in doubt, check the GLFW docs.

Future Plans

These features/changes are being considered for future versions of the library.

• An alternate way of loading the library

License

Copyright © 2021 Joshua Suskalo

Distributed under the zlib/libpng license, the same as GLFW.