Project-Alice
Box2D
Project-Alice | Box2D | |
---|---|---|
12 | 35 | |
242 | 7,318 | |
- | - | |
10.0 | 0.0 | |
4 days ago | about 2 months ago | |
C++ | C++ | |
GNU General Public License v3.0 only | MIT License |
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Project-Alice
- Project Alice (Victoria 2 open-source clone) December Update (nearing 1.0 release)
- July update and PUBLIC DEMO for Project Alice
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Does anyone know any good open source project to optimize?
Currently I am part of a team working on an open source game (https://github.com/schombert/Project-Alice) that intends to lean heavily on vectorization for performance, since it is a strategy game that has to work with a decently large amount of data, by the standards of a game at least. We have things set up so that most of the data is stored in something like the struct of arrays pattern and we have some machinery in place for doing vectorized operations on it. But obviously we could benefit from a specialist. On the other hand, perhaps a game is not serious enough for your work, and there is a lot of things going on in a game that are probably irrelevant for your work.
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C++ Show and Tell - June 2023
Well on our way to recreating the game Victoria 2 in C++ from scratch (i.e. we didn't use an existing game engine). https://github.com/schombert/Project-Alice
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OpenVic2 Has a Map! (Full update on the project)
It looks like it will be done much sooner then. They have done a lot so far https://github.com/schombert/Project-Alice/blob/main/docs/Devlogs/may/may.md
- May 2023 update for Project Alice (the Victoria 2 "retro clone")
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Next CK3 dlc just gave me the vibe
a small search resulted in this development blog from 3 days ago (after one a month ago)
- April 2023 update for Project Alice (the Victoria 2 "retro clone")
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I have just gotten victoria 2, any tips for begginers?
Enjoy: https://github.com/schombert/Project-Alice/blob/main/docs/rules.md It isn't 100% complete, but it is most of the way there
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OpenVic2 vs Project Alice
Project Alice is a continuation of a previous effort by u/schombert to create an open source Victoria 2. He is rebuilding the project in c++ with opengl and can be found here. I'm not sure on actual implementation details and any modding / multiplayer details
Box2D
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Blaze: A High Performance C++ Math library
For typical game physics engines... not that much. Math libraries like Eigen or Blaze use lots of template metaprogramming techniques under the hood that can help when you're doing large batched matrix multiplications (since it can remove temporary allocations at compile-time and can also fuse operations efficiently, as well as applying various SIMD optimizations), but it doesn't really help when you need lots of small operations (with mat3 / mat4 / vec3 / quat / etc.). Typical game physics engines tend to use iterative algorithms for their solvers (Gauss-Seidel, PBD, etc...) instead of batched "matrix"-oriented ones, so you'll get less benefits out of Eigen / Blaze compared to what you typically see in deep learning / scientific computing workloads.
The codebases I've seen in many game physics engines seem to all roll their own math libraries for these stuff, or even just use SIMD (SSE / AVX) intrinsics directly. Examples: PhysX (https://github.com/NVIDIA-Omniverse/PhysX), Box2D (https://github.com/erincatto/box2d), Bullet (https://github.com/bulletphysics/bullet3)...
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Jolt Physics raylib: trying 3D C++ Game Physics Engine
Box2D: 2D engine used in Unity and also earlier versions of Godot. Open source.
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Rust Game Physics Engines: PhysX, Rapier, XPBD & Others
Box2D GitHub repo: erincatto/box2d
- Nebula is an open-source and free-to-use modern C++ game engine
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Linear code is more readable
Why is 600 lines too long? How are you able to make that judgment call without first knowing what the algorithm is even doing? People setting arbitrary limits like this is what leads to convoluted spaghetti, instead of just taking things on a case by case basis. Here’s a function from the Box2D code running a particularly complex algorithm for solving contact velocities https://github.com/erincatto/box2d/blob/411acc32eb6d4f2e96fc... .
It’s 310 lines long. It reads very well, and it looks very maintainable. It has very clear comments explaining the reasoning behind the harder parts of the code. Would you reject this code because it’s pretty long? I wouldn’t.
There is no such thing as too long or too short. There’s overengineered and there’s underengineered and there’s a sweet spot in the middle that has the perfect amount of engineering with the least amount of complexity (preferably no additional complexity than the original problem warranted). Sometimes, the problem at hand is inherently a large algorithm and requires many lines of code. Don’t split it up! It just makes it harder for future maintainers who now have to figure out if the additional functions are actually being used elsewhere or if they’re just there to make the code “pretty”.
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How would you implement a simple collision system?
There is always the approach of looking at how an existing engine is implemented, such as box2d: https://github.com/erincatto/box2d
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C++23: The Next C++ Standard
TIL Box2D must not be serious code because it doesn't use copious amounts of explicit temporaries[0].
And just for the record, I'm very glad Erin Catto decided to use operator overloading in his code. It made it much easier for me to read and understand what the code was doing as opposed to it being overly verbose and noisy.
[0]: https://github.com/erincatto/box2d/blob/main/src/collision/b...
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Make a game engine in C++
For Physics Box2d can be used as a simple starting point.
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Does anyone know any good open source project to optimize?
I suspect most C++ physics libraries like Box2D (https://github.com/erincatto/box2d) or Bullet3 (https://github.com/bulletphysics/bullet3) could really benefit a lot from SIMD.
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what to start learning
for 2D physics have a look at Box2D it's amazing https://box2d.org/
What are some alternatives?
retro-game - a 2d game made in SFML and c++
Bullet - Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.
DiscordCoreAPI - A bot library for Discord, written in C++, and featuring explicit multithreading through the usage of custom, asynchronous C++ CoRoutines.
Chipmunk - A fast and lightweight 2D game physics library.
key-manager - A desktop app for password management and creation, developed using Qt.
raylib - A simple and easy-to-use library to enjoy videogames programming
OpenVic - Main Repo for the OpenVic Project
LiquidFun - 2D physics engine for games
Jsonifier - A few classes for parsing and serializing objects from/into JSON, in C++ - very rapidly.
PhysX - NVIDIA PhysX SDK
Open-V2
box2d-lite - A small 2D physics engine