DOOM
Godot
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DOOM | Godot | |
---|---|---|
91 | 2,744 | |
12,738 | 83,500 | |
3.1% | 2.7% | |
2.5 | 10.0 | |
12 days ago | 4 days ago | |
C++ | C++ | |
GNU General Public License v3.0 only | MIT License |
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DOOM
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Doom Released Under GPLv2
commercially exploit or use for any commercial purpose."
[1] https://github.com/id-Software/DOOM/commit/4eb368a960647c8cc...
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GTA 5 source code leaks online
The original Doom had third-party audio playback routines, so the source came with a rewritten sound server: https://github.com/id-Software/DOOM/tree/master/sndserv
The bad news: this code only compiles and runs on linux. We couldn't
- What you can do with C ?
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Software Disenchantment
Here's a repo for you with no test coverage and no auto-generated DI. They using unsafe pointers all over the place, too!
https://github.com/id-Software/DOOM
Shall I prepare the postage for the letter in which you'll call John Carmack an MBA? Should we send another to Chris Sawyer? I heard he didn't even write a formal design doc for Roller Coaster Tycoon!
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Ask HN: Good practices for my first C project
cURL is one of the most used C libs and is an example of good quality C code. If you follow the style used there, see e.g. https://github.com/curl/curl/blob/master/lib/dynhds.h (and associated dynhds.c) you will be good.
Looking at the source of some of the old game-engines from the era that have since been released as open-source can also be helpful, like https://github.com/id-Software/DOOM.
In both cases notice how simple and elegant a lot of the code is. There is already enough complexity inherent in the problem they are solving, and that is where the focus should be.
Any IDE with a working language server to make it easy to jump around and refactor should work fine. Limitations might be due to the C language itself?
Error handling on such a fixed platform does not need to be super-advanced. You should always be within the confines of the system so there shouldn't be much that can go wrong. If stuff goes wrong anyway just being able call a function Fatal("FooBar failed with code 34") when unexpected stuff happens and have it log somewhere to be able to dig around should be enough. You never need to be able to recover and retry.
Make sure to use https://clang.llvm.org/docs/AddressSanitizer.html or a similar tool when developing outside of the PSOne.
That said, consider statically allocating global buffers for most stuff and avoid using the heap for most stuff.
Good luck working within the confines of the PSOne! Many hackers have pulled the hair from their head on that platform ;)
- Ask HN: Where do I find good code to read?
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Running Stable Diffusion in 260MB of RAM
Probably more easily than you'd think. DOOM is open source[1], and as GP alludes, is probably the most frequently ported game in existence, so its source code almost certainly appears multiple times in GPT-4's training set, likely alongside multiple annotated explanations.
[1] https://github.com/id-Software/DOOM
- Where can I get game files to study?
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Some were meant for C [pdf]
I'd define an arena as the pattern where the arena itself owns N objects. So you free the arena to free all objects.
My first job was at EA working on console games (PS2, GameCube, XBox, no OS or virtual memory on any of them), and while at the time I was too junior to touch the memory allocators themselves, we were definitely not malloc-ing and freeing all the time.
It was more like you load data for the level in one stage, which creates a ton of data structures, and then you enter a loop to draw every frame quickly. There were many global variables.
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Wikipedia calls it a region, zone, arena, area, or memory context, and that seems about right:
https://en.wikipedia.org/wiki/Region-based_memory_management
It describes history from 1967 (before C was invented!) and has some good examples from Apache ("pools") and Postgres ("memory contexts").
I also just looked at these codebases:
https://github.com/mit-pdos/xv6-public (based on code from the 70's)
https://github.com/id-Software/DOOM (1997)
I looked at allocproc() in xv6, and gives you an object from a fixed global array. A lot of C code in the 80's and 90's was essentially "kernel code" in that it didn't have an OS underneath it. Embedded systems didn't run on full-fledges OSes.
DOOM tends to use a lot of what I would call "pools" -- arrays of objects of a fixed size, and that's basically what I remember from EA.
Though in g_game.c, there is definitely an arena of size 0x20000 called "demobuffer". It's used with a bump allocator.
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So I'd say
- malloc / free of individual objects was NEVER what C code looked like (aside from toy code in college)
- arena allocators were used, but global vars and pools are also very common.
- arenas are more or less wash for memory safety. they help you in some ways, but hurt you in others.
The reason C programmers don't malloc/free all the time is for speed, not memory safety. Arenas are still unsafe.
When you free an arena, you have no guarantee there's nothing that points to it anymore.
Also, something that shouldn't be underestimated is that arena allocators break tools like ASAN, which use the malloc() free() interface. This was underscored to me by writing a garbage collector -- the custom allocator "broke" ASAN, and that was actually a problem:
https://www.oilshell.org/blog/2023/01/garbage-collector.html
If you want memory safety in your C code, you should be using ASAN (dynamically instrumented allocators) and good test coverage. Arenas don't help -- they can actually hurt. An arena is a trivial idea -- the problem is more if that usage pattern actually matches your application, and apps evolve over time.
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What is your gender?
Doom
Godot
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Tetris Development 1 - Setting Up
Instead, I was recommended Godot by a fellow developer. It is an easy-to-pickup and beginner-friendly open-source engine, which I will use to develop the Tetris game.
- Web Game Engines and Libraries
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Name it Better (ideas for making more informative names)
Here's an example file tree from a part of the Godot game engine source code.
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Ask HN: Yo wants to build a game, I'm lost. What can I do?
Godot [1] is a very nice game engine. There's a game on Itch.io that teaches the scripting language it uses [2], and a ton of great tutorials on YouTube for beginners and experts alike.
[1]: https://godotengine.org/
- Show HN: GodotOS: A Fake Operating System Interface Made in the Godot Engine
- Unity Software cutting 25% of staff in 'company reset' continuation
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Show HN: Mutable.ai – Turn your codebase into a Wiki
The Bitcoin and Mastadon links don't seem to be working! (wiki not found)
Would love to see this for Godot (https://github.com/godotengine/godot). Maybe Maplibre too (https://github.com/maplibre/maplibre-native)!
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My thought on different engines
Godot Engine is a free and open-source game engine. The story started as an in-house engine of an Argentinian studio in 2007, and since 2014, it's been a community-driven project with a lot of contributors.
- How do "feature flags work"
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Duplicated Enemies all respond to a signal belonging to a different instance of that enemy.
I think this is the PR.
What are some alternatives?
open-watcom-v2 - Open Watcom V2.0 - Source code repository, Wiki, Latest Binary build, Archived builds including all installers for download.
bevy - A refreshingly simple data-driven game engine built in Rust
project-based-tutorials-in-c - A curated list of project-based tutorials in C
o3de - Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D engine that enables developers and content creators to build AAA games, cinema-quality 3D worlds, and high-fidelity simulations without any fees or commercial obligations.
Apollo-11 - Original Apollo 11 Guidance Computer (AGC) source code for the command and lunar modules.
Cocos2d - Cocos2d-x is a suite of open-source, cross-platform, game-development tools utilized by millions of developers across the globe. Its core has evolved to serve as the foundation for Cocos Creator 1.x & 2.x.
doomgeneric - Easily portable doom
GDevelop - :video_game: Open-source, cross-platform game engine designed to be used by everyone.
luxtorpeda - Steam Play compatibility tool to run games using native Linux engines
Panda3D - Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU
angband - A free, single-player roguelike dungeon exploration game
ursina - A game engine powered by python and panda3d.