Clither

slither.io but not shit. Rollback netcode. No lag.

A cross-platform multi-player 2D arcade game implemented in plain C89.

How to Build

The tools you will need to build this project are:

• CMake.
• A C89 compliant C compiler.
• Make (If you're on Mac/linux).
• Git (if you want to make to make updating the code easy).

Windows MSVC Developers should start the "Visual Studio Command Prompt" from the start menu instead of CMD. It sets the required environment variables. If you are using MSYS then you can use regular CMD (or bash).

The general procedure is as follows:

• cd into the source directory of clither (where this README is located).
• Make a new directory called build.
• cd into that directory with your command prompt/terminal/whatever.
• Type cmake .. (Two dots are important)

This will configure the project for your platform. Linux/Mac users now type make to build.

If you're on Windows, there will now be Visual Studio project files, inside the build directory. So go in there and open them up.

Emscripten

Install emscripten:

git clone https://github.com/emscripten-core/emsdk.git
cd emsdk
git pull
./emsdk update-tags
./emsdk install latest
./emsdk activate latest
source ./emsdk_env.sh

Next, configure:

cd path/to/clither
emcmake cmake --preset web
cmake --build build-web-Release/ --paralell $(nproc)

Nix

Nix is the easiest for building the server and cross compiling to windows: https://nixos.org/download/.

You can install nix locally (--no-daemon). If you are worried about cluttering your system with unnecessary files, don't worry. Everyting is contained within the /nix directory.

Once installed, you will also want to create /etc/nix/nix.conf and add the following lines:

extra-experimental-features = nix-command flakes

Build server as a docker image

nix build .#docker
docker load < result
docker run clither:latest

To include a custom settings.ini file:

nix build .#docker --override-input settings path:./path/to/settings.ini
docker load < result
docker run clither:latest

Cross-compile to windows

nix build .#client-win64
zip -r clither-win64.zip result/

Usage

There are 3 different modes:

• Host mode: ./clither --host will create a server process in the background, then launch the client and join your local server. Other players on your network will be able to join your server if they want.
• Server mode: ./clither --server will only run the server component. No window will open.
• Client mode: ./clither --ip <server ip> will only run the client component and join the specified server.