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Entitas is a super fast Entity Component System Framework (ECS) specifically made for C# and Unity. Internal caching and blazing fast component access makes it second to none. Several design decisions have been made to work optimal in a garbage collected environment and to go easy on the garbage collector. Entitas comes with an optional code generator which radically reduces the amount of code you have to write and makes your code read like well written prose.

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The optional code generator lets you write code that is super fast, safe and literally screams its intent.

public static Entity CreateRedGem(this Pool pool, int x, int y) {
    return pool.CreateEntity()
               .IsGameBoardElement(true)
               .IsMovable(true)
               .AddPosition(x, y)
               .AddResource(Res.redGem)
               .IsInteractive(true);
}

var entities = pool.GetEntities(Matcher.AllOf(Matcher.Move, Matcher.Position));
foreach (var entity in entities) {
    var move = entity.move;
    var pos = entity.position;
    entity.ReplacePosition(pos.x, pos.y + move.speed);
}

Entitas is fast, light and gets rid of unnecessary complexity. There are less than a handful classes you have to know to rocket start your game or application:

• Entity
• Pool
• Group
• Group Observer

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The Code Generator generates classes and methods for you, so you can focus on getting the job done. It radically reduces the amount of code you have to write and improves readability by a huge magnitude. It makes your code less error-prone while ensuring best performance. I strongly recommend using it!

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The optional Unity module integrates Entitas nicely into Unity and provides powerful editor extensions to inspect and debug pools, groups, entities, components and systems.

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Read the wiki or checkout the awesome example projects to see Entitas in action. These example projects illustrate how systems, groups, observers and entities all play together seamlessly.

Each release is published with zip files attached containing all source files you need.

Entitas-CSharp.zip

• Entitas
• Entitas.CodeGenerator

Entitas-Unity.zip

• Entitas
• Entitas.CodeGenerator
• Entitas.Unity
• Entitas.Unity.CodeGenerator
• Entitas.Unity.VisualDebugging

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The project is hosted on GitHub where you can report issues, fork the project and submit pull requests.

Entitas.sln contains all projects and tests in one solution. Run build.sh to copy all required Entitas source files to all Unity projects.

To run the tests, navigate to the project root folder and execute runTests.sh.

• Check the issues to make sure nobody hasn't already requested it and/or contributed it
• Fork the project
• Checkout the latest develop
• Start a feature/yourFeatureOrBugfix branch based on the latest develop
• Make sure to add/update tests. This is important so nobody will break it in a future version. Please write tests first, followed by the implementation.
• Commit and push until you are happy with your contribution
• Create a pull request

Big shout out to @mzaks, @cloudjubei and @devboy for endless hours of discussion and helping making Entitas awesome!

• @sschmid | @s_schmid | @entitas_csharp

Entitas is available in

• C#
• Swift
• Objective-C
• Go
• F#
• TypeScript
• Java
• Haskell
• Erlang
• Clojure