A high-performance C# based Archetype & Chunks Entity Component System (ECS) for game development and data-oriented programming.

• 🏎️ FAST > Best cache efficiency, iteration, and allocation speed. Plays in the same league as C++/Rust ECS Libs!
• 🚀 FASTER > Arch is on average quite faster than other ECS implemented in C#. Check out this Benchmark!
• 🤏 BARE MINIMUM > Not bloated, it's small and only provides the essentials for you!
• ☕️ SIMPLE > Promotes a clean, minimal, and self-explanatory API that is simple by design. Check out the Wiki!
• 💪 MAINTAINED > It's actively being worked on, maintained, and comes along several Extensions!
• 🚢 SUPPORT > Supports .NetStandard 2.1, .Net Core 6 and 7, and therefore you may use it with Unity or Godot!

Download the package, get started today and join the Discord!

dotnet add PROJECT package Arch --version 1.3.0-alpha

Arch is bare minimum, easy to use, and efficient. Let's say you want to create some game entities and make them move based on their velocity... sounds complicated? It's not! Arch does everything for you, you only need to define the entities and the logic.

I bet you don't want to read tons of documentation, theory, and other boring stuff right?
Let's just ignore all that deep knowledge and jump in directly to get something done.

// Components ( ignore the formatting, this saves space )
public struct Position{ float X, Y };
public struct Velocity{ float Dx, Dy };

public sealed class Game 
{
    public static void Main(string[] args) 
    {     
        // Create a world and entities with position and velocity.
        var world = World.Create();
        for (var index = 0; index < 1000; index++) 
            world.Create(new Position{ X = 0, Y = 0}, new Velocity{ Dx = 1, Dy = 1});
        
        // Enumerate entities with Position AND Velocity to modify them
        var query = new QueryDescription().WithAll<Position,Velocity>();
        world.Query(in query, (Entity entity, ref Position pos, ref Velocity vel) => {
            pos.X += vel.Dx;
            pos.Y += vel.Dy;
            Console.WriteLine($"Moved: {entity.Id}"); 
        }); 
    }
}

This is all you need to know, with this little knowledge you are already able to bring your worlds to life.
However, if you want to take a closer look at Arch's features and performance techniques, check out the Wiki! There's more to explore, for example...

• Bare minimum - No overengineering, no abstracted hidden costs
• Incredibly fast and efficient
• Is actively maintained and developed
• Grateful for every contribution

• Archetypes with 64KB large chunks for your massive worlds
• Incredibly small Entity size
• Optional Pure-ECS for maximum performance and efficiency
• Bulk/Batch Entity operations
• High-performance Queries
• Multithreaded Queries
• Enumerators
• CommandBuffers
• Events
• Generic and Non-Generic API
• AOT friendly
• Several extensions with systems, tools, source generators and more
• Monogame, Unity, Godot Integration guides
• And much more...

Arch has some extensions that add more features and tools. Among them for example :

• 🛠️ Arch.Extended > Adds a set of tools and features to save boilerplate code!
• 🔎 Godot Entity Debugger > An Arch Entity debugger for the Godot engine!
• 🔎 Stride Entity Debugger > An example of Arch in the Stride engine, with additional entity and system inspector!
• 🔎 Arch.Unity > A library that makes the integration of Arch in Unity much easier, with many cool new features!
• ❓ Your Tool-Library? > If you develop more tools and features for Arch, let us know and we'll list them here!

Arch is already one of the fastest ECS and uses the best techniques under the hood to achieve maximum performance and efficiency. Care is always taken to find a healthy balance between CPU performance and ram utilization.

If you are more interested, have a look at the benchmark!

Were we able to convince you? If so, let's get started. We have prepared a whole wiki to explain all the important aspects and provide examples. Click here for the documentation!

Arch is already used in some projects, for a more detailed look, take a look at the wiki!

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