DOOM
86Box
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DOOM | 86Box | |
---|---|---|
91 | 32 | |
12,640 | 2,313 | |
2.4% | 4.5% | |
2.5 | 9.9 | |
22 days ago | 6 days ago | |
C++ | C | |
GNU General Public License v3.0 only | GNU General Public License v3.0 only |
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.
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.
- 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
86Box
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86Box crashes on startup of any virtual machine
86Box crashes on startup without showing any message, no matter the hardware or operating system being emulated and 86Box build, either stable, experimental or old/new dynamic recompiler. Created an issue on GitHub but the dev who replied said he couldn't reproduce it.
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Virtual Machine for old childhood Rom games
For emulation, you can look into PCem/86Box
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Fake recruiter Lazarus lured aerospace employee with trojanized coding challenge
Unsurprising, of the 300 staffing agencies in our area only 23 are actually licensed to legally operate as a service. Trying to authenticate which are "fake" or "real" is a thread most companies/applicants rather not pull.
There is also the fake-hire scam: where staff are lured away with a lucrative compensation packages, data-mined by the competitor, and finally jettisoned before the evaluation period expires (typically 6 to 10 months).
A few infected PDFs from various bad actors are also floating around out there with exaggerated promises.
Keep safe, and note 86box supports read-only backing images and sessions Like Bochs/kvm:
https://github.com/86Box/86Box/releases
(works on Apple M1 laptops, but is slow)
- 86Box 4.0 Released
- Port of 86BoxManager to Linux
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Any way I could get Beach Life (2002) running on a Mac?
https://86box.net/#downloads | https://github.com/86Box/86Box/releases
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Where does PCem store the Hard disk you create? I want to move it to a different location and can't find it.
Features are implemented much, much faster, especially if you use nightly builds. Always adding hardware. You can look at the changelog: https://github.com/86Box/86Box/releases
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86box crashing when using shaders?
Shaders are a rather young feature in 86box and very incomplete (only single pass shaders supported for now). I am not surprised they crash. Please report the bug to https://github.com/86Box/86Box/issues
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I’m wondering if someone would be interested in helping my get an old windows 95 game to run.
Another solution is to emulate a win95 old pc. It works great and the compatibility is very very high. Try out 86Box. There is a process to set it up and install Windows, but it is worth it for playing stubborn games.
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Getting vintage (old world) Linux distro’s installed on modern virtualization software impossible?
You want 86Box, a full PC emulator as opposed to a virtual machine.
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.
pcem - PCem
project-based-tutorials-in-c - A curated list of project-based tutorials in C
qemu-3dfx - MESA GL/3Dfx Glide pass-through for QEMU
Apollo-11 - Original Apollo 11 Guidance Computer (AGC) source code for the command and lunar modules.
dosbox-x - DOSBox-X fork of the DOSBox project
doomgeneric - Easily portable doom
PCem-ROMs - This is a collection of requiered ROMs files for PCem emulator. RIP PCem 2021
luxtorpeda - Steam Play compatibility tool to run games using native Linux engines
em-dosbox - An Emscripten port of DOSBox
angband - A free, single-player roguelike dungeon exploration game
box86 - Box86 - Linux Userspace x86 Emulator with a twist, targeted at ARM Linux devices