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Felucca

A game inspired by Ultima Online. Currently in the the early phases of development. Made with Clojure and Unity through Arcadia.

I’ll add a video of the gameplay here soon.

Dependencies

  • Unity (last tested with 2019.2.17f1)
  • git

Set up the environment

These steps only need to be done once.

Download the Felucca source code

git clone [email protected]:mpereira/felucca.git

Set up the Unity project

  1. Open the Unity Hub
  2. Click Add
  3. Select the directory for the git repository root
  4. Click on the project row, the Unity project will load and open
  5. Go to Edit > Project Settings > Player
  6. Make sure that Resolution and Presentation > Run In Background* is checked
  7. Make sure that Other Settings > Configuration > Scripting Backend is Mono
  8. Make sure that Other Settings > Configuration > Api Compatibility Level is .NET 4.0

Set up Arcadia

Arcadia is a git submodule in Felucca.

git submodule init
git submodule update

Now you should see Arcadia Started! in the Unity Console. Unity is ready to run some Clojure!

Connect to the nREPL

I’m currently using Emacs with the Miracle package for development, following mostly the instructions in the Arcadia wiki.

My workflow looks like the following:

  1. Press the “Play” button in Unity to start the game
  2. Run M-x miracle in Emacs and select arcadia:localhost:3722
  3. Evaluate files with miracle-load-file
  4. Evaluate forms by changing to their namespaces with miracle-eval-namespace and then calling miracle-eval-defun or miracle-eval-expression-at-point
  5. Evaluate buffers with miracle-eval-buffer or miracle-load-file

I have some helpers for developing Felucca in my Emacs configuration.

As of [2019-12-30 Mon] connecting to the nREPL using Cider doesn’t work for me. I get error messages like the one below:

MissingMethodException: Cannot find member split matching args
(wrapper dynamic-method) System.Object.CallSite.Target(System.Runtime.CompilerServices.Closure,System.Runtime.CompilerServices.CallSite,object,object)
(wrapper dynamic-method) System.Object.CallSite.Target(System.Runtime.CompilerServices.Closure,System.Runtime.CompilerServices.CallSite,object,object)
user$eval__6884__6889.__interop_split6891 (System.Object , System.Object __temp_1) (at <87f26d80bb03477db7e8b2a5eaa5becd>:0)
user$eval__6884__6889.invokeStatic () (at <87f26d80bb03477db7e8b2a5eaa5becd>:0)
user$eval__6884__6889.invoke () (at <87f26d80bb03477db7e8b2a5eaa5becd>:0)
clojure.lang.Compiler.eval (System.Object form) (at <fb1204dbf0b848beaab1559f81f1b22c>:0)
clojure$core$eval__22334.invokeStatic (System.Object ) (at <75aedcbf6ad14e4293bea1888c10ab1d>:0)
clojure$core$eval__22334.invoke (System.Object ) (at <75aedcbf6ad14e4293bea1888c10ab1d>:0)
clojure.lang.Var.invoke (System.Object arg1) (at <fb1204dbf0b848beaab1559f81f1b22c>:0)
Arcadia.NRepl+EvalFn.invoke () (at Assets/Arcadia/Editor/NRepl.cs:256)
arcadia$internal$callbacks$run_callbacks__4722.invokeStatic (System.Object , System.Object ) (at <87f26d80bb03477db7e8b2a5eaa5becd>:0)
arcadia$internal$callbacks$run_callbacks__4722.invoke (System.Object , System.Object ) (at <87f26d80bb03477db7e8b2a5eaa5becd>:0)
arcadia$internal$editor_callbacks$run_callbacks__4816.invokeStatic () (at <87f26d80bb03477db7e8b2a5eaa5becd>:0)
arcadia$internal$editor_callbacks$run_callbacks__4816.invoke () (at <87f26d80bb03477db7e8b2a5eaa5becd>:0)
clojure.lang.Var.invoke () (at <fb1204dbf0b848beaab1559f81f1b22c>:0)
Arcadia.EditorCallbacks.RunCallbacks () (at Assets/Arcadia/Editor/EditorCallbacks.cs:24)
UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at /Users/builduser/buildslave/unity/build/Editor/Mono/EditorApplication.cs:303)

Author

Murilo Pereira

License

MIT