Quake
Box2D
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Quake
- Nebula is an open-source and free-to-use modern C++ game engine
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Don't waste money on a math coprocessor they said;
K5/Cyrix could overlap Integer and FPU operations, what they couldnt do was interleave (pipeline) FPU operations so that multiple floating point instructions ran in parallel.
https://www.phatcode.net/res/224/files/html/ch63/63-02.html
Here a non perspective correction related Quake FPU code example https://github.com/id-Software/Quake/blob/bf4ac424ce754894ac...
Lcliploop:
- Quake's lightning gun bug explained
- Can one create games on a low end pc?
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Honestly don't understand why people keep buying from them
Quake seriously wasn't any more complicated. The only thing about Quake that really made it stand out was its 3D engine which, while revolutionary for its time, was basically stone-age technology by modern standards.
- How can i compile a modified source of quake?
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Get in nerd, we're going fragging (1999)
You can also read this very old CPMA code that reimplements bunny hopping into Quake 3, a link I'm able to dig up because I have also been playing since literally the first one came out.
- Free as in freedom
- Is it possible to create a raycast game with rooms above rooms?
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upload a picture of waluigi
I checked this out too, https://github.com/id-Software/Quake expands to a 12.3MB directory for me (excluding .git/, which is another 3MB or so).
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?
ioq3 - The ioquake3 community effort to continue supporting/developing id's Quake III Arena
Bullet - Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.
halflife - Half-Life 1 engine based games
Chipmunk - A fast and lightweight 2D game physics library.
quakespasm - QuakeSpasm -- A modern, cross-platform Quake game engine based on FitzQuake.
raylib - A simple and easy-to-use library to enjoy videogames programming
Quake-III-Arena - Quake III Arena GPL Source Release
LiquidFun - 2D physics engine for games
Godot - Godot Engine – Multi-platform 2D and 3D game engine
PhysX - NVIDIA PhysX SDK
Quake-2 - Quake 2 GPL Source Release
box2d-lite - A small 2D physics engine