entt VS Tasker

EnTT is a popular alternative to flecs for C++, which has different performance/memory characteristics.

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.

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.

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.

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.

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.

You can think of DynaMix as combining one of these libraries with an ECS like entt(https://github.com/skypjack/entt)

I almost exclusively use C++ for my projects. Especially modern C++. When it makes sense(especially for dev tools), I use Python since for those I'm not so worried about distribution and long-term robustness.

Anyway here they are:

Qt desktop app written in C++:https://github.com/thebigG/Tasker

Simple GPIO front-end for linux GPIO driver(could definitely use some improvement) written in C++ and uses boost:https://github.com/thebigG/simple_gpio

WebApp I JUST started working on(This will be a frontend for a YOCTO/FPGA project I'm working on; guitar pedals), and yes it uses good old C++ and runs on the browser:

https://github.com/thebigG/wPedals

And while I'm at it, might as well mention my custom plugins for Godot Game Engine(C++):https://github.com/thebigG/godot-3.x-modules

I have found that C++ is the best compromise for me between performance and elegance ifI do say so myself.

That's really cool that you have it in one of the official repos! Sadly I'm an Ubuntu user myself so it might not be that straightforward to get as far as I know. Though I was able to easily build it from source. Some of these can come down to personal preference, but I'm a big fan of AppImages. If you would like to see an example of a Qt application may be turned into an AppImage. I have an example here: https://github.com/thebigG/Tasker/blob/main/.github/workflows/linux_build.yaml

Here's an example of me using this on GitHub Actions:https://github.com/thebigG/Tasker/blob/win_compile/.github/workflows/ci.yaml

https://github.com/thebigG/Tasker

It's an app that allows you to accurately track your commitments via hardware hooks(audio, mouse and keyboard). The UI can definitely use some work, but figured some people mind find as useful as I do.

Shameless plug:https://github.com/thebigG/Tasker/blob/main/Tasker/build_AppImage.py

Been working on this little project for a bit now:https://github.com/thebigG/Tasker

Tasker - Create Commitments and track your progress through hardware hooks(Mic, Keyboard, Mouse)

https://github.com/thebigG/Tasker