freeciv
DOOM
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freeciv | DOOM | |
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44 | 91 | |
1,186 | 12,738 | |
1.9% | 3.1% | |
9.9 | 2.5 | |
6 days ago | 10 days ago | |
C | C++ | |
GNU General Public License v3.0 only | GNU General Public License v3.0 only |
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freeciv
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6 free games updated in the last 60 days
#4 - Free Civ - Its Civilization 1 and 2, a free clone. You can download the game here; OR play via the online web version... which is my favorite... has a great 2.5 iso view that adds depth.. or join a mega game where 300 or so human players play one turn per day.
- anime_irl
- Is it possible to see the code of 90s computer games?
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Will Civ II ever be available on the download sites? I’m an oldster and just can’t get into newer gaming.
Also, a similar question points to FreeCiv: http://www.freeciv.org/
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Im looking to try open source games, what are some good ones?
Freeciv
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What is your favorite open source Linux game? Mine is Wideland (Best way to describe is the way Settlers 3 should have been)
I also played my fair share of FreeCiv, because my second favourite Amiga game was Civilization. ;-)
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Does anyone remember Civ2 on the PS1? The computer player took so long after a while 😂
It's worth-trying if you're interested in seeing what the "4x" genre is about. Probably not Civ 2 on PSX, but you can get Civ: Revolution (Civ "dumbed down" for consoles) on the PS360 generation consoles, Civ: Revolution 2 on mobile (not a bad attempt but really should've stuck on console), Civ 6 on the Nintendo Switch, or FreeCiv on PC and/or mobile if you want a Civ2-experience that isn't stuck on the original Playstation (or hunting down an older DOS/Windows copy). Alternatively, if looking for a Civ5 experience and not on Steam but mobile: There is UnCiv which can be pretty decent for the price (free) and platform (mobile). It won't match Civ6, but it's near "current" based on Civ5.
- FreeCiv update 3.0.6 released - Free & open-source empire-building strategy game inspired by the history of human civilization
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link testing
It's a tough one to recommend for, that fanless system tends to overheat just being on, much less running anything, from all I've read. I'd probably stick with some basics like ADOM, FreeCiv, Battle for Wesnoth, etc. (all three are free by the way). Those games are non-system intensive so shouldn't put too much pressure on it to run them, and turn-based so you don't have to worry about lag. Looking for a bit more action, give the demo for Torchlight a go, see how the system handles it. Should be capable enough but with heat issues it could put a crimp in the play. Similar with Windows (Bedrock) edition Minecraft, give the free trial a go and see what's what. Fez, Bastion, Braid, Baldur's Gate 1 & 2, Beyond Good & Evil, Commandos 2+3, Deus Ex, Elder Scrolls III: Morrowind, Empire Earth, Europa Universalis II, Fallout 1/2/Tactics, Fate, FlatOut 2, Gothic 2, Ground Control, Hearts of Iron, Hitman 3: Contracts, Homeworld (the classic version, comes with the remastered), IL-2 Sturmovik, Jagged Alliance 2, Machinarium, Majesty, Medal of Honor: Allied Assault, Mount & Blade, Oddworld: Abe's Exoddus, Planescape: Torment, Praetorians, Prince of Persia: The Sands of Time, Quake 1-3, Rayman 2, Return to Castle Wolfenstein, Shadow Warrior Classic, Sid Meier’s Civilization III (or give Freeciv a go instead), Silent Storm, SimCity 4 Deluxe, Soldier of Fortune II: Double Helix, Starcraft (original, it's the free one), System Shock 2, The Curse of Monkey Island, The Settlers IV, Theme Hospital, Thief, Thief 2, Tom Clancy's Rainbow Six, Tom Clancy's Splinter Cell, Tomb Raider II, should run on that.
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Civilisation style games on a budget
Freeciv is well, free : https://www.freeciv.org
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
What are some alternatives?
Unciv - Open-source Android/Desktop remake of Civ V
open-watcom-v2 - Open Watcom V2.0 - Source code repository, Wiki, Latest Binary build, Archived builds including all installers for download.
OpenTTD - OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe
project-based-tutorials-in-c - A curated list of project-based tutorials in C
freeciv-web - Freeciv-web is an Open Source strategy game implemented in HTML5 and WebGL, which can be played online against other players, or in single player mode against AI opponents.
Apollo-11 - Original Apollo 11 Guidance Computer (AGC) source code for the command and lunar modules.
unknown-horizons - Unknown Horizons official code repository
doomgeneric - Easily portable doom
julius - An open source re-implementation of Caesar III
luxtorpeda - Steam Play compatibility tool to run games using native Linux engines
0ad - Git mirror of the 0 A.D. source code (http://trac.wildfiregames.com/browser)
angband - A free, single-player roguelike dungeon exploration game