entt VS flecs

Compare entt vs flecs and see what are their differences.

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entt flecs
78 48
9,351 5,430
- -
9.8 9.7
6 days ago 2 days ago
C++ C
MIT License MIT License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

entt

Posts with mentions or reviews of entt. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-09-02.
  • Focus: A simple and fast text editor written in Jai
    7 projects | news.ycombinator.com | 2 Sep 2023
    https://pastebin.com/VPypiitk This is a very small experiment i did to learn the metaprogramming features. its an ECS library using the same model as entt (https://github.com/skypjack/entt). In 200 lines or so it does the equivalent of a few thousand lines of template heavy Cpp while compiling instantly and generating good debug code.

    Some walkthrough:

    Line 8 declares a SparseSet type as a fairly typical template. its just a struct with arrays of type T inside. Next lines implement getters/setters for this data structure

    Line 46 Base_Registry things get interesting. This is a struct that holds a bunch of SparseSet of different types, and providers getters/setters for them by type. It uses code generation to do this. The initial #insert at the start of the class injects codegen that creates structure members from the type list the struct gets on its declaration. Note also how type-lists are a native structure in the lang, no need for variadics.

    Line 99 i decide to do variadic style tail templates anyway for fun. I implement a function that takes a typelist and returns the tail, and the struct is created through recursion as one would do in cpp. Getters and setters for the View struct are also implemented through recursion

    Line 143 has the for expansion. This is how you overload the for loop functionality to create custom iterators.

    The rest of the code is just some basic test code that runs the thing.

  • Introducing Ecsact
    8 projects | dev.to | 24 Jun 2023
    Since we wanted a common game simulation that would be on both the server and the client we looked into a few libraries that would fit our ECS needs. It was decided we were going to write this common part of our game in C++, but rust was considered. C++ was a familiar language for us so naturally EnTT and flecs came up right away. I had used EnTT before, writing some small demo projects, so our choice was made based on familiarity. In order to integrate with Unity we created a small C interface to communicate between our simulation code and Unity’s C#. Here’s close to what it looked like. I removed some parts for brevity sake.
  • Sharing Saturday #472
    7 projects | /r/roguelikedev | 23 Jun 2023
    Are you sure you don't want to use a C++ package manager? Libtcod is on Vcpkg and with that setup you could add the fmt library or EnTT. fmt fixes C++'s string handling and EnTT fixes everything wrong with the entities of the previous tutorials.
  • Where can I find the juiciest, most complex and modern c++ code?
    2 projects | /r/cpp_questions | 9 Jun 2023
  • What are the limits of blueprints?
    4 projects | /r/unrealengine | 25 May 2023
    There's also a performance question. While we can now use Blueprint nativization to convert Blueprints to C++ the result will be a fairly naive version, fast enough for most purposes but not if you're trying to push every bit of performance. This is where you're looking at making sure you're hitting things such as using the CPU cache as well as possible for an ECS system (Look at ENTT or Flecs if you want to see what they're about and why you'd want one), or a system needing to process massive amounts of data quickly such as the Voxel Plugin.
  • any resources for expanding on ECS?
    4 projects | /r/gamedev | 22 Apr 2023
    For a modern engine you’re probably best looking at Unity’s DOTS. You may also want to check out some of the different open source ECS libraries such as flecs and EnTT are two popular ones for C++, but there’s lots of them. Largely you’ll see lots of different approaches taken, all with their own pros and cons. Not all of them will be performant (some focus more on the design benefits) while others will be optimised for certain use cases. What you should prioritise will depend on your specific needs.
  • DynaMix 2.0.0 Released
    8 projects | /r/cpp | 13 Apr 2023
    You can think of DynaMix as combining one of these libraries with an ECS like entt(https://github.com/skypjack/entt)
  • Flecs – A fast entity component system for C and C++
    2 projects | news.ycombinator.com | 4 Apr 2023
    https://github.com/skypjack/entt is a fantastic alternative; also, one of the most beautiful codebases/elegant designs I 've come across.
    2 projects | news.ycombinator.com | 4 Apr 2023
  • Please roast my ECS implementation
    2 projects | /r/gamedev | 27 Feb 2023
    As a way to force myself to learn more about game engines I've created asimov-ts. While doing it, I tried to refrain from looking at other ECS implementations as much as possible and use only more theoretical sources. As a result, I think it's a bit different from other stuff I've seen like EnTT and bevy_ecs.

flecs

Posts with mentions or reviews of flecs. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-12-30.
  • ECS, Finally
    4 projects | news.ycombinator.com | 30 Dec 2023
    I've also been enjoying building My First Game™ in Bevy using ECS. The community around Bevy really shines, but Flecs (https://github.com/SanderMertens/flecs) is arguably a more mature, open-source ECS implementation. You don't get to write in Rust, though, which makes it less cool in my book :)

    I'm not very proud of the code I've written because I've found writing a game to be much more confusing than building websites + backends, but, as the author notes, it certainly feels more elegant than OOP or globals given the context.

    I'm building for WASM and Bevy's parallelism isn't supported in that context (yet? https://github.com/bevyengine/bevy/issues/4078), so the performance wins are just so-so. Sharing a thread with UI rendering suuucks.

    If anyone wants to browse some code or ask questions, feel free! https://github.com/MeoMix/symbiants

  • Databases are the endgame for data-oriented design
    5 projects | /r/rust | 6 Dec 2023
    Flecs does just that: https://ajmmertens.medium.com/why-it-is-time-to-start-thinking-of-games-as-databases-e7971da33ac3
  • Introducing Ecsact
    8 projects | dev.to | 24 Jun 2023
    Since we wanted a common game simulation that would be on both the server and the client we looked into a few libraries that would fit our ECS needs. It was decided we were going to write this common part of our game in C++, but rust was considered. C++ was a familiar language for us so naturally EnTT and flecs came up right away. I had used EnTT before, writing some small demo projects, so our choice was made based on familiarity. In order to integrate with Unity we created a small C interface to communicate between our simulation code and Unity’s C#. Here’s close to what it looked like. I removed some parts for brevity sake.
  • Prolog for future AI
    2 projects | /r/prolog | 24 Jun 2023
    Repository: https://github.com/SanderMertens/flecs
  • An in-game query engine heavily inspired by prolog
    2 projects | /r/prolog | 9 Jun 2023
    This is the project: https://github.com/SanderMertens/flecs (query engine implementation lives here: https://github.com/SanderMertens/flecs/tree/master/src/addons/rules)
  • What are the limits of blueprints?
    4 projects | /r/unrealengine | 25 May 2023
    There's also a performance question. While we can now use Blueprint nativization to convert Blueprints to C++ the result will be a fairly naive version, fast enough for most purposes but not if you're trying to push every bit of performance. This is where you're looking at making sure you're hitting things such as using the CPU cache as well as possible for an ECS system (Look at ENTT or Flecs if you want to see what they're about and why you'd want one), or a system needing to process massive amounts of data quickly such as the Voxel Plugin.
  • What's the hot tech stack these days?
    2 projects | /r/PBBG | 23 May 2023
    If I knew C++ and I'd heard about it before I started my current project, I would have been tempted to use this https://github.com/SanderMertens/flecs which can be built to WASM. Of course you still need JavaScript in the front end to link to the WASM part. I've recently been using esbuild to bundle my front end code, which does a pretty similar job to webpack, but is a bit faster.
  • Bevy and WebGPU
    8 projects | news.ycombinator.com | 18 May 2023
    When do think bevy will support entity-entity relationships ? https://github.com/bevyengine/bevy/issues/3742.

    Flecs ECS already supports this: https://github.com/SanderMertens/flecs/blob/master/docs/Rela...

  • any resources for expanding on ECS?
    4 projects | /r/gamedev | 22 Apr 2023
    For a modern engine you’re probably best looking at Unity’s DOTS. You may also want to check out some of the different open source ECS libraries such as flecs and EnTT are two popular ones for C++, but there’s lots of them. Largely you’ll see lots of different approaches taken, all with their own pros and cons. Not all of them will be performant (some focus more on the design benefits) while others will be optimised for certain use cases. What you should prioritise will depend on your specific needs.
  • Flecs 3.2, a high performance game development framework for C and C++ is out!
    3 projects | /r/programming | 27 Mar 2023
    To find more about Flecs, see the Github repository: https://github.com/SanderMertens/flecs

What are some alternatives?

When comparing entt and flecs you can also consider the following projects:

Hazel - Hazel Engine

raylib - A simple and easy-to-use library to enjoy videogames programming

flecs-lua - Lua script host for flecs

Roguelike-Tutorial-2021 - Roguelike tutorial written hard with GDscript

UnrealCLR - Unreal Engine .NET 6 integration

Taskflow - A General-purpose Parallel and Heterogeneous Task Programming System

bgfx - Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.

Svelto.ECS - Svelto ECS C# Entity Component System

imgui - Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies

python-tcod - A high-performance Python port of libtcod. Includes the libtcodpy module for backwards compatibility with older projects.

roguelike-tutorial-2021 - Game made during the "RoguelikeDev Does The Complete Roguelike Tutorial 2021" event

gainput - Cross-platform C++ input library supporting gamepads, keyboard, mouse, touch