A Rust framework for building Minecraft: Java Edition servers. Built on top of [Bevy ECS](https://bevyengine.org/learn/book/getting-started/ecs/), Valence is an effort to create a Minecraft compatible server completely from scratch in Rust. You can think of Valence as a _game engine for Minecraft servers_. It doesn't do much by default, but by writing game logic yourself and leveraging Bevy's powerful [plugin system](https://bevyengine.org/learn/book/getting-started/plugins/), you can make almost anything. Opinionated features like dynamic scripting, dedicated executables, and vanilla game mechanics are all expected to be built as optional plugins. This level of modularity is desirable for those looking to build highly custom experiences in Minecraft such as minigame servers. # Goals Valence aims to be the following: * **Complete**. Abstractions for the full breadth of the Minecraft protocol. * **Flexible**. Valence provides direct access to the lowest levels of Minecraft's protocol when necessary. * **Modular**. Pick and choose the features you actually need. * **Intuitive**. An API that is easy to use and difficult to misuse. Extensive documentation and examples are important. * **Efficient**. Optimal use of system resources with multiple CPU cores in mind. Valence uses very little memory and can support [thousands](https://cdn.discordapp.com/attachments/998132822864834613/1051100042519380028/2022-12-10_03.30.09.png) of players at the same time without lag (assuming you have the bandwidth). * **Up to date**. Targets the most recent stable version of Minecraft. Support for multiple versions at once is not planned. However, you can use a proxy with [ViaBackwards](https://www.spigotmc.org/resources/viabackwards.27448/) to achieve backwards compatibility with older clients. ## Current Status Valence is still early in development with many features unimplemented or incomplete. Expect to encounter bugs, limitations, and breaking changes. Here are some noteworthy achievements: - `valence_nbt`: A speedy new library for Minecraft's Named Binary Tag (NBT) format. - `valence_protocol`: A library for working with Minecraft's protocol. Does not depend on Valence and can be used in other projects. - Authentication, encryption, and compression - Block states - Chunks - Entities and metadata - Bounding volume hierarchy for fast spatial entity queries - Player list and player skins - Dimensions, biomes, and worlds - JSON Text API - A Fabric mod for extracting data from the game into JSON files. These files are processed by a build script to generate Rust code for the project. The JSON files can be used in other projects as well. - Inventories - Items - Particles - Anvil file format (read only) - Proxy support ([Velocity](https://velocitypowered.com/), [Bungeecord](https://www.spigotmc.org/wiki/bungeecord/) and [Waterfall](https://docs.papermc.io/waterfall)) Here is a [short video](https://www.youtube.com/watch?v=6P072lKE01s) (outdated) showing the examples and some of Valence's capabilities. # Getting Started ## Running the Examples After cloning the repository, run ```shell cargo r -r --example ``` to view the list of examples. I recommend giving `parkour`, `conway`, `terrain`, and `cow_sphere` a try. Next, open your Minecraft client and connect to the address `localhost`. If all goes well you should be playing on the server. ## Adding Valence as a Dependency Valence is published to [crates.io](https://crates.io/crates/valence). Run `cargo add valence` to add it to your project. Documentation is available [here](https://docs.rs/valence/latest/valence/). However, the crates.io version is likely outdated. To use the most recent development version, add Valence as a [git dependency](https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#specifying-dependencies-from-git-repositories) ```toml [dependencies] valence = { git = "https://github.com/valence-rs/valence" } ``` View the latest documentation by running `cargo d --open` in your project. # Contributing Contributions are welcome! Please see [CONTRIBUTING.md](https://github.com/valence-rs/valence/blob/main/CONTRIBUTING.md). You can also join [the Discord](https://discord.gg/8Fqqy9XrYb) to discuss the project and ask questions. # License Code is licensed under [MIT](https://opensource.org/licenses/MIT) while the Valence logo is under [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/) # Funding If you would like to contribute financially, consider sponsoring me (rj00a) on [GitHub](https://github.com/sponsors/rj00a) or [Patreon](https://www.patreon.com/rj00a). I would love to continue working on Valence and your support would help me do that. Thanks!