Contributing

Important Note

While we're thrilled that there is so much interest in reverse engineering LEGO Island and are happy to accept contributions from anyone who would like to help progress us further to our goal of a complete codebase, proposed changes to this repository must adhere to a certain degree of engineering quality. While the established contributors here are more than happy to provide code reviews and constructive criticism, it is not their job to teach potential contributors C++ or decompilation fundamentals. As a project that is largely an artifact of the free time of its contributors, the more of that (often scarce) resource that can be dedicated to efficient work, the faster the decompilation will progress. Unfortunately, this results in well-intentioned but poorly constructed contributions actually hurting progress in the long-term. While we are greatly appreciative of the sentiment, if you aren't very confident in your decompilation abilities, it is generally in the project's best interest that you return when you have a better grasp over the process.

Generally, decompilation is a fairly advanced skill. Depending on your current proficiency with C/C++ and x86 assembly, it could take you months or even years to learn the skills necessary to do it adequately. If you're still interested in learning, part 1 of the decompilation vlog covers the overall process and should give you a starting point that you can dive in from. Once again, please make yourself familiar with this process before attempting to contribute code to this project.

Ghidra Server

For documenting the original binaries and generating pseudocode that we decompile with, we primarily use Ghidra (it's free and open source). To help with collaboration, we have a shared Ghidra repository with all of our current work. You are free to check it out and mess around with it locally, however to prevent sabotage, you will need to request permission before you can push your changes back to the server (ask in the Matrix room).

To access the Ghidra repository, use the following details:

Address: server.mattkc.com
Port: 13100

General Guidelines

If you feel fit to contribute, feel free to create a pull request! Someone will review and merge it (or provide feedback) as soon as possible.

Please keep your pull requests small and understandable; you may be able to shoot ahead and make a lot of progress in a short amount of time, but this is a collaborative project, so you must allow others to catch up and follow along. Large pull requests become significantly more unwieldy to review, and as such make it exponentially more likely for a mistake or error to go undetected. They also make it harder to merge other pull requests because the more files you modify, the more likely it is for a merge conflict to occur. A general guideline is to keep submissions limited to one class at a time. Sometimes two or more classes may be too interlinked for this to be feasible, so this is not a hard rule, however if your PR is starting to modify more than 10 or so files, it's probably getting too big.

This repository currently has only one goal: accuracy to the original executables. We are byte/instruction matching as much as possible, which means the priority is making the original compiler (MSVC 4.20) produce code that matches the original game. As such, modernizations and bug fixes will probably be rejected for the time being.

Overview

3rdparty: Contains code obtained from third parties, not including Mindscape. Generally, these are libraries that have been placed in the public domain or are freely available on the web. As these are unaltered files, our style guide (see below) does not apply.
ISLE: Decompilation of ISLE.EXE. It depends on some code in LEGO1.
LEGO1: Decompilation of LEGO1.DLL. This folder contains code from Mindscape's custom in-house engine called Omni (file pattern: mx*), the LEGO Island-specific extensions for Omni and the game's code (file pattern: lego*) as well as several utility libraries developed by Mindscape.
tools: A set of tools aiding in the decompilation effort.
util: Utility headers aiding in the decompilation effort.

Tooling

Please make yourself familiar with the available tooling and annotations.

Code Style

In general, we're not exhaustively strict about coding style, but there are some preferable guidelines to follow that have been adopted from what we know about the original codebase:

Formatting

We are currently using clang-format with a configuration file that aims to replicate the code formatting employed by the original developers. There are integrations available for most editors and IDEs. The required clang-format version is 17.x.

Naming conventions

We are currently using a customized version of ncc with a configuration file that aims to replicate the naming conventions employed by the original developers. ncc requires Clang 16.x; please refer to the tool and the GitHub action for guidance.

Questions?

For any further questions, feel free to ask in either the Matrix chatroom or on the forum.

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