jlang-rs-gd

J is an extremely high-level mathematical notation and programming language.

Godot is a game / gui / multimedia engine.

jlang-rs-gd lets you call J from godot, using a glue layer built in rust.

requirements

• rust and cargo (rust is a programming language, cargo is its build tool)
• clang (the godot bindings need this to build)
• godot (I use 3.3, but any 3.x should work)
• j (so you have a j dll to call)

building the dll

The output of the build process is a dll that you need to copy to your Godot project.

Until jlang-rs is somewhat stable, you need a local working copy in a sibling directory (or uncomment the { git = ... } line in Cargo.toml)

cd /path/to/dev/area
git clone https://github.com/tangentstorm/jlang-rs
git clone https://github.com/tangentstorm/jlang-rs-gd
cd jlang-rs-gd

to build jlang_rs_gd.dll:

• set the LIBCLANG_PATH environment variable
• run cargo test, cargo build, etc.

examples:

# powershell:
$env:LIBCLANG_PATH="d:/program files/llvm/bin"; cargo test

# git bash:
LIBCLANG_PATH='d:/program files/llvm/bin' cargo test

Running the demo

Once you have a sucessful build:

cp target/debug/jlang_rs_gd.dll demo/
cp j.dll demo/   #  or .so on linux (untested)

The run godot and open the project in the demo/ directory.

Adding the DLL to your own Godot project

This is a slightly tedious, manual process:

• copy the two DLLs from the above section to your project directory.
• copy the jlang-rs-gd.tres file from the demo directory, or recreate it from scratch
• create a GdNative script in godot, using jlang-rs-gd.tres as the