The journey to Nintendo Switch

325 points14
jvanderbot9 hours ago

> Removing all uses of undefined behaviour is probably a fool's errand, as it would require significant changes throughout the code that would take time and come with a performance impact, all for no immediate practical benefit. So I just hunted down the undefined behaviour cases that actually broke determinism. This was easy enough, as we have plenty of tools we use to test determinism. By comparing the game state CRC for every tick of every test (we have 2,417 tests) between x86 and ARM, I believe I got a pretty good coverage of potential issues.

Holy hell.

bri3d8 hours ago

This kind of determinism testing is a fairly common approach in games that implement shared-state multiplayer, and I think that's why it was implemented for Factorio as well. Otherwise you get drift between clients that breaks the game.

TrainedMonkey5 hours ago

One alternative is to run everything on the server, but that introduces another set of problems.

m4rtink2 hours ago

IIRC that's what Satisfactory does and it causes all sorts of synchronization issues and glitches - non-hosting players not seeing buildings or stuff on belts or even glitching into/colliding with things that were not there a split second ago, as they loaded from the server too slowly.

That won't really happen in Factorio due to the shared state & makes possible insanely complex layouts that all players can see an interact with exactly the same. The downside usually is that eventually - just after you got that 20 GW nuclear power plant with trucked water & and steam going - the slowest player starts to have issues as his hardware no longer can keep with the complexity of the simulation.

Then you either start shedding players or call it a day and start again with a different objective or mod.

camgunz8 hours ago

I built a similar system for a Doom port--compatibility was an important issue for me, and conveniently I was adding client/server multiplayer with state deltas, so I had all the infra built to do a full dump every tic. It sounds wild, but if your game is already deterministic and you support saving, you're 80% of the way there.

TillE9 hours ago

Automated testing is great! More game developers should get serious about using it, even if you're not doing full coverage unit testing like business software.

mbrodersen4 minutes ago

Yes! Automated testing is a super power. I haven’t had a single bug in production for 5+ years because of automated tests.

Moncefmd7 hours ago

Whats CRC?

inoffensivename7 hours ago

I'm guessing cyclic redundancy check. You turn the game state in each tick into a number, then play the exact same game on both platforms. If you get the same stream of numbers, you can be pretty sure the game is behaving correctly.

hoten6 hours ago

It's likely a hash of the game state. They save input and playback recordings of the game, expecting to always receive the same hash for the game state every frame.

Just this week I started on a similar system for a game engine I work on (Zelda Classic). Main reason was for testing purposes, but another benefit is that it is SO cool to see the game replayed for you. Like those self playing pianos.

nimih7 hours ago

cyclic redundancy check

Arrath10 hours ago

> "This is the first time we had to make sure the game is deterministic between ARM and x86. We should be fine, C++ is portable, right? Just don't use undefined behavior. Turns out we use quite a lot of undefined behavior..."


shadowgovt8 hours ago

This has been my experience dealing with portability and C++ as well. In theory, very portable. In practice, "portable" as long as you don't care about the details of how features work and didn't use any undefined behaviors that just happened to work in the first architecture but are implemented totally differently in the new architecture (and C++, of course, embraces undefined behavior instead of keeping the developer out of it).

Things as simple as "believing you know the byte-width of a primitive data type" are dangerous.

RicoElectrico10 hours ago

Would it occur had they used UBsan on debug builds?

astrange3 hours ago

It won't find threading issues, or "implementation-defined behavior" (which isn't the same thing as undefined behavior).

yeputons4 hours ago

No doubt. For starters, UBsan does not check for any invalid memory access.

In my C++ course, I require that the code runs correctly under 5 different compilers (GCC, LLVM Clang, Apple Clang, MSVC, Intel C++ Compiler Classic) on 3 OS (Ubuntu, Windows, macOS) in Release, Debug+Valgrind, Debug+Sanitizers modes, and students still get UB quite often.

Extra reading: and discussion at

von_lohengramm7 hours ago

For things that UBsan checks for, yes, but there's a ridiculous amount of things that are surprisingly UB in C(++).

naranha10 hours ago

If the switch proves anything it's that you don't have to pay $1600 for a GPU to enjoy amazing games. Or the other way round, if you pay $1600 for a gpu it does not mean that you'll be able to play any good games.

gbasp5 hours ago

I think the technical limitations of the Nintendo Switch makes for more interesting games in general. Most of the games on my Xbox and PC tend to be FPS/Action games with very boring, brown and green "realistic" environments whereas games on my Switch tend to be bright and colorful with lots of 2D and pixel graphics and games in the vein of simulators, adventures, roguelikes etc.

misterprime3 hours ago

Tangent: It's amazing that the popularity of XP to "level up" and HP to bring to zero has become. This was a new concept to me way back when Final Fantasy 3 (3 in the US, I think 6 in Japan) came out. It felt very niche and reserved for a specific type of game. Now those ideas are everywhere.

What's a common new game trend since then? I can think of these: randomized microtransaction packs, online multiplayer PvP and co-op.

Are there any established trends that I'm missing out on, or new concepts emerging that old gamers may not have come across?

csense11 minutes ago

- Early access. Back in the day the dev would pay you with a free copy of the game for helping with the beta. Now you pay the dev for the privilege of helping with the beta.

- Cosmetics. Tons of games have stuff you can buy (equipment, skins, etc.) to make your character look cool. Extra stuff that can be developed easily by an artist, doesn't affect game balance, and sometimes even costs real money.

- Battle pass. I've never bought one but I think you get stuff on two tracks for progression, a free track and a paid track. Progression resets and there are new tracks like 4 times a year or something. Makes people want to open their wallets for the paid track due to FOMO and "...but I already earned it!"

I think if you switch from free to paid you immediately get all the stuff on the paid track you've already progressed past. Also I think they want to charge you $10 four times a year, every time the new tracks come out.

- -- Sort of like Steam / Epic / GOG for indie developers too small to be on those sites yet.

chillfox45 minutes ago

Crafting is absolutely everywhere, as is some kind of level up system (attributes/skills/perks/traits/etc...).

spamalot1592 hours ago

The Battle Royale genre (Fortnite, PUBG, ect.) is the biggest new genre I can think of. The 100 player last-man-standing game mode probably wouldn't have been possible without the advancements in networking speed and infrastructure in the last 15ish years.

gibspaulding27 minutes ago

I was just wondering today why the BR format has taken over in recent years and I can't really come up with a technical reason for it. Red orchestra had 64 player pvp matches back in 2006 and I think Arma had similar sized game modes in that era too. I could see a BR mod for either of those, but it didn't happen (or at least take off). Maybe there's something I'm missing, but it seems feasible.

I think the gaming world just really latches onto tends. A few years it was survival/crafting games, before that RPG's. Good luck figuring out what's next!

throwaway6753095 hours ago

A lot of the best 3rd party switch games are ports from PC games or games available on other consoles: spelunky, shovel knight, cup head.

I think the technical imitations can definitely hamstring their games, even the first party ones. breath of the wild comes to mind, and frequently dips into sub 30 fps which breaks the immersion factor.

bobthepanda5 hours ago

Most of those are hardly Switch exclusive.

I like the Switch, but it definitely chugs, and I suspect had we not had the supply chain meltdown over the pandemic we would‘ve gotten a more significant hardware refresh.

As far as simulators go, I‘m playing Two Point Campus, and it definitely chugs and crashes occasionally.

Semaphor4 hours ago

But that's your choice. Almost all of my PC games are 4X and turn based RPGs. All of them make heavy use of a mouse and keyboard. And in addition, you don't need stupid 4 slot cards to play them.

dmitriid4 hours ago

It would be true if Nintendo still had support of a beast like Rare. Alas, there are very few if any companies that are willing to work with these limitations and create games specifically for Switch.

And the main reason the games are colorful on Switch is that Nintendo still, to this day, has a reputation of kids-only console. And Switch also pushed it towards "casual one-off gaming" which invites bright colors (think Candy Crush).

izacus4 hours ago

Sadly, pretty much all of the games I want to enjoy run terribly on the Switch to the point where I had to go back to my 800$ GPU to play them.

Pretty much every strategy / tactics game (outside a single one: Fire Emblem) runs terribly, below 30 fps, looks very burry and... the killing blow... has crazy long loading times. You can go grab coffee while Civ6 is loading and still won't be done by the time.

Quality control of games from Nintendo is very very poor. There are several games that came out which were unfinishable or unplayable and they just happily certified them.

chillfox42 minutes ago

Interestingly Civ runs fine for me and looks good handheld, but it all falls apart when docked.

mackatap4 hours ago

I only use Nintendo hardware for Nintendo software and I'm never disappointed!

afterburner9 hours ago

I mean that's always been Nintendo's thing, hasn't it? Cheaper, less powerful consoles, but focus on iconic gameplay

hbn9 hours ago

I'd say that only really started in the 7th console generation (Wii, PS3, Xbox 360)

Gamecube and prior was roughly comparable to the competition, but after that the other companies were trying to outperform each other in graphical fidelity while Nintendo released basically another Gamecube but with motion controls. And it was a hit!

amalcon6 hours ago

Certainly the N64 (immediately prior to Gamecube) was supposed to be super high tech. They actually stressed the partnership with SGI in the marketing, and literally named the console after the word size of its CPU. In retrospect the former was pretty weird, since the public would not have known that name or anything.

Folks can quibble about the Gamecube if they like, but step back one generation and they were definitely trying to push the technology.

hbn4 hours ago

The 90s console wars were all about bits, even though no one knew what it meant other than "more bits = better". It was really Sega that started the bit-wars, releasing the Genesis while Nintendo was still selling the NES. They were very successful with getting kids to compare how powerful their console was to Nintendo's by slapping a giant "16-BIT" front-and-center on the top of the console and mentioning it in all the advertising. And that kinda stuck around for years.

Most of those kids didn't know what 64-bit meant, but they knew it must be better than their old 16-bit piece of junk. That's 4x the amount of bits, therefore the console was 4x better!

deergomoo8 hours ago

> Gamecube and prior was roughly comparable to the competition

It gets forgotten about because it didn’t sell all that well and because the tiny little 1.8GB discs kept most of the multi-platform blockbusters off it, but the GameCube was significantly more powerful than the PS2 (though not as powerful as the Xbox).

stryan9 hours ago

> I'd say that only really started in the 7th console generation (Wii, PS3, Xbox 360)

I think that's when they really started leaning into it again, but Gunpei Yokoi (Gameboy inventor) was a big proponent of the idea, which he called "Lateral Thinking with Withered Technology". So it's been a part of Nintendos design process for a while before that.

vikingerik6 hours ago

It was fairly true for the NES and SNES generations as well. Each used a CPU five years old by then and a RAM size that was common in computers eight years prior. Really, for only the N64 console generation did Nintendo ever try to outdo its competitors on hardware specs.

DerekL23 minutes ago

It doesn't matter how the NES compared to computers, because computers cost much more. Also, less RAM is required if the program is on a cartridge.

hbn4 hours ago
highwind5 hours ago

I'd argue that first time Nintendo exhibited that mentality was with GameBoy.

mattl4 hours ago

I think their Game and Watch systems show it too.

ProfessorLayton9 hours ago

Not always, the N64 was more powerful and more expensive (Game carts) than the competition. So was the GameCube (It was more powerful than the PS2).

pdntspa9 hours ago

Depends entirely on what you play. Cyberpunk 2077 in 4K with DLSS and raytracing is exquisite...

shadowgovt8 hours ago

... as long as you ignore the places where CDPR didn't actually finish debugging the game and errors abound, from innocent things like a pathing error in a pre-rendered character animation causing them to steamroll through movable objects in a scene to arguable game-breakers like a mission neither being succeed-able or failable because some key internal flag is in the wrong state, with the only solution being to roll back to a save before the error occurred.

pdntspa7 hours ago

I've beaten the game and NEVER had any issues like that, other than right after launch. You should consider leaving the faction of people who are irrationally bitter at that game because it is a position that is becoming more comical over time. The game is really quite good now and has been for some time.

> actually finish debugging the game and errors abound

Literally EVERY software developer is guilty of this. I cannot count how many games have come out in this state and there wasn't an ridiculous backlash, just CP2077.

NOTHING comes out bug free nowadays, because we as an industry have this idiotic policy of shipping things ASAP

shadowgovt6 hours ago
MayeulC6 hours ago

Consider SQLite as a conterpoint before using superlatives. There are others.

Edit: well, of course, a game bug, even if game-breaking, isn't safety critical. Yo have to plan what to spend time on.

petesergeant9 hours ago

I looked up what this meant, and I think it means this:

jaimehrubiks9 hours ago

The level of detail is impressive

WastingMyTime894 hours ago

Cyberpunk 2077 main issues are the very unequal main story and the extremely boring and repetitive side quests (also the driving gameplay but that’s fixable). That’s not things graphics can save sadly.

candiddevmike12 hours ago

> Now, the final startup time when the game is installed on internal storage is 70 seconds, but let's not get ahead of ourselves.

Maybe I don't notice this with other games but that seems like a really long time.

Macha11 hours ago

Animal Crossing has some pretty long load times on startup or coming back from islands, but I'd still expect it's under a minute.

On the other hand, factorio is a load once and play for hours type game compared to something like mario which incurs loads on each level

elliekelly11 hours ago

Civ VI can also take a while to load. Especially if you’re loading a game that’s already in progress. I haven’t timed it but I wouldn’t be surprised if it was over a minute.

hbn12 hours ago

That jumped out to me too. I was hoping "let's not get ahead of ourselves" meant he'd explain why the startup time is so long but it's never mentioned again.

I just timed Breath of the Wild (cartridge version), and from the time I launched the game from the Switch menu to seeing the game menu was about 16 seconds, and the time from selecting a save file to loading the game world was about 18 seconds. What exactly about this game makes it take so long to load?

rjh2912 hours ago

BotW got some after-launch patches that significantly reduced the launch time.

They did this by overclocking the Switch during load. I didn't see any mention of boost/overclock in the Factorio writeup, though.

hbn11 hours ago

Interesting, I wasn't aware (or forgot)! I looked into it though, and it seems like it wasn't anywhere near the minute+ mentioned in the article.

I found a GameFaqs forum thread[1] from shortly after the game launched that claims it was about 20 seconds. And a US Gamer article[2] that says the update that came a couple years later only shaved off about 5 seconds (seems within the ballpark of what I measured)



simias10 hours ago

Do you know if this technique is available for all games or just Nintendo's own? It seems like it would be easy to cause issues if games were allowed to mess with the clocking willy-nilly, so I assumed that it was only done on Zelda because it's a first-party title (and one of the biggest on the console).

cecilpl210 hours ago
hbn10 hours ago

This article[1] claims Crash Team Racing takes advantage of boost mode, so seemingly it's available to third-party developers.

Perhaps they don't get to mess with the clock "willy nilly" and it's more like an API that enables a higher - but fixed - clock speed?


Shywim9 hours ago

This is available for any game since 2019, here’s an article talking about it:

w-m8 hours ago

Gonna have to wait for someone from the community to come along and profile the game to find that 10 Mb json file of in-app purchase items being parsed in O(n*2).

timeimp8 hours ago

I love how this still comes up all these years later

_puk7 hours ago

I presume the GP is referring to the GTA V fix, which was only 18 months ago [0].. having been ever present in a game that had been out for over 6 years!

I think it'll be referred to for years to come as an example of not only how seemingly simple decisions can come back to haunt you, but also how patient users can be if they really want to play something..


izacus4 hours ago

Pretty much all of the games on Switch have very long loading times. Some stretch even into minutes (XCom and Civ6 come to mind as being pretty bad).

klodolph12 hours ago

Some games, like ACNH, have a long load time.

Andrex10 hours ago

Which is a little disappointing, since one of the things I loved most about the GameCube game was the instant load times. I also enjoyed taking the disc out of the slot after the game was loaded.

spijdar6 hours ago

Animal Crossing is an interesting game to me because of how little the series code has changed over time. The GameCube releases seems to have almost literally been the Nintendo 64 release recompiled against a different SDK for the GC platform (weighing in at only 27MB total for the GC release! An entire 1.4GB DVD for 27MB!), while the Wii and 3DS games, and seemingly the Switch one, are variants of the DS rewrite (seemingly the last time the codebase was scrapped and restarted).

I'd be really curious to know how similar the Switch code is. On the surface, the game seems to have been extended quite a bit, but I feel like a lot of it is just uncovering functionality that already existed in the codebase, e.g. the ability to place arbitrary items on the outside grid, I'm fairly sure the "engine" already supported this, and it was the way outside objects were implemented, there was just no interface for adding/removing them.

Andrex5 hours ago
kergonath9 hours ago

I haven’t measured, but Subnautica (on Switch) takes forever to load a save when it starts. I would not be surprised if it takes more than one minute.

pdntspa8 hours ago

How does a game like Factorio take so long to load? The game assets themselves are like megabytes. What is it doing?

xienze11 hours ago

I’m kind of surprised (and bummed) that they ported it to the Switch and not the iPad. The Switch is a bit slow (can’t imagine big bases performing well) and I’m not convinced using a game pad will work well. By contrast, modern iPads are smoking fast and I bet an iPad touch interface would suit the game fairly well. Ah well, maybe some day.

candiddevmike11 hours ago

I think you could say this about a lot of games. IMO, Apple doesn't make it easy to port a game from PC to iPad (app store guidelines in particular), and I doubt there are as many iPad gamers as there are other platforms.

frostburg9 hours ago

This is true but Factorio is not Madden; for example they have a sizable (for Factorio) built-in audience of everyone making iOS apps. The pencil would work well for input, I'd gladly buy it again.

matsemann11 hours ago

The Switch got a touch screen as well?

xienze10 hours ago

A teeny tiny one in comparison.

kergonath9 hours ago
wishfish10 hours ago

For anyone who wants a Factorio-like on iOS, there's a great game called Builderment. It's not as complex as Factorio but it does get rather involved. Works well with touch and even works well on the smaller screens of iPhones.

kergonath9 hours ago

I was going to check it out, but IAPs are full of gem packs, which is not very encouraging. How is the freemium aspect?

swarnie11 hours ago

Playing modded Rimworld (even on reasonable hardware) is a total ball ache for loading times.

I need to be absolutely sure i want to play the game five minutes before i do.

dang14 hours ago


Factorio is coming to Nintendo Switch - - Sept 2022 (359 comments)

j_m_b13 hours ago

Will the controller designs end up in the pc version? Would love to play this on my Steam Deck in console mode!

Morgawr12 hours ago

The article linked says this:

> Even after the launch, there is much to do. Next to my screen there's a stack of post-it notes with future improvements, possible features and technical debt I need to solve. As mentioned in the announcement last week, after the launch I will also work on controller support for PC and Steam Deck.

glandium13 hours ago

The Nintendo Switch has an ARM64 CPU, which means the biggest part of porting to that CPU is now done. Does it mean we can expect an Apple Silicon mac build some time soon(ish)?

ezfe11 hours ago

I emailed them last week about Apple Silicon and they told me to watch for today's blog post. I interpret that to mean that, yes - this means they can more easily do that.

desindol12 hours ago

No. It’s a completely different graphic stack.

Kukumber12 hours ago

If you target PC/Console and don't have an abstract GPU interface, then you should rethink your life choices

And all the graphics stacks nowadays are similar, Vulkan, Metal, DX12, all share the same ideas

Also there are countless opensource cross platform GPU libs, bgfx [1] or sokol [2] for example

[1] -

[2] -

desindol10 hours ago

Yeah theoretically it’s that easy but irl it’s not…

fredoralive12 hours ago

There’s already a Mac OS version, so it they’ve presumably already handled that side of things.

Shared40412 hours ago

IIRC, Factorio uses SDL - which afaict already targets macOS.

Cyberdog8 hours ago

Like most macOS games, it most likely is an x86-64 game that Apple's x86-64 emulator does an admirable job of emulating. As far as I can tell, very few Mac games, even new ones, are proper ARM builds currently.

hatware11 hours ago

It runs fine on the M1. iPad support would be the real winner.

TillE11 hours ago

> It allowed me to make many Nintendo Switch specific optimizations, and even some optimizations for the PC version

Are there significant CPU-specific optimizations that can be made for the Switch / ARMv8 that wouldn't apply to x86-64? I've never really dug into things at that level, I wouldn't know where to begin except for like vector instructions.

packetlost11 hours ago

My understanding is ARM has less strict memory (ordering) guarantees, as well as the inability to explicitly trigger cache line flushes from user-space. That being said, I imagine most of the optimizations would come from the particular aspects of the GPU/graphics pipeline, which I imagine is substantially different from the standard PC structure.

TillE9 hours ago

Yeah you can always cut corners with the GPU if you have to, but Factorio has the large problem of making a CPU-intensive deterministic simulation run at 60 Hz.

Thinking about it some more, there are also probably some tweaks you could use for situations with limited resources which wouldn't apply to most PCs, but would affect the Switch.

Rebelgecko7 hours ago

(Disclaimer: I haven't written assembly for a while so this may not be true any more)

One cool thing about ARM is that vector instructions run in parallel with the regular CPU pipeline. You can do some neat optimizations where you interleave sequential part of an algorithm runs while the SIMD instructions are executing. However if you do this yourself the code is going to be super non-portable. In general, knowing that something is always going to be running on a Switch lets you dig deeper into architecture specific optimizations, since x86 has so much variance it would take a ton of effort to really dial in performance on the whole menagerie of Intel and AMD CPUs

djmips7 hours ago

CPU wise - although you can optimize specially for the ARM - and it's great to make sure your math is using NEON and that you don't have some pathological slow down because your code assumes more cores you'll still find the lions share of your optimization on CPU benefiting both architectures.

For fun, I'll mention that there is a hardware hash function that you can use. The public A57 documentation has a performance guide available that is applicable to the Switch.

midnightclubbed7 hours ago

Most likely the optimizations are higher level than that (for the most part). With the switch they will be able to target to specific core counts and use a less generic thread/memory synchronization api.

There may be some cases where the fixed ARMv8 instruction set allows them to use instructions that have equivalents on recent x64 processors but not back to their minspec PC.

colpabar11 hours ago

I have no idea. But if there are, the factorio devs will find them and write an extremely detailed blog post about the entire process.

exebook13 hours ago

Am I the only one who after seeing the title thought they are building Nintendo switch inside Factorio? Which makes me think can it at least run something like Atari 2600 at decent speed?

jerf12 hours ago

A Minecraft-based Atari 2600 emulator was running about 1 frame per second last I knew:

And that's heavily based on internal scripting with real code.

The recent "Minecraft"-in-Minecraft emulation was done with pure Redstone internal to the game, but has to be run on a specialized server that accelerates Redstone operations by several thousands to be even fast enough to record time lapses at a reasonable sped.

In-game simulations of logic gates that are generally running at fractions of a Hz are a pretty steep obstacle to overcome for any "real" computing like that. Just to calibrate your expectations.

bombcar12 hours ago

Lots of things already are in progress on similar things:

mdmglr13 hours ago

I’m not a game developer. What I would like to know is how does porting the code that draws the UIs and perhaps the game work? For example on PC one might use WinForms and DirectX so is this just a matter of writing wrappers to all your DirectX calls to the Switch equivalents?

weberer12 hours ago

Factorio uses SDL. Factorio has been cross-platform (Linux, Windows, Mac) from the beginning, so it makes sense that they're not tied down to Microsoft's proprietary nonsense. I'd imagine this choice made it a lot easier to port to the Switch as well.

pjmlp12 hours ago

It is a bit more involved than that, but yeah that is kind of basics.

The Switch supports OpenGL 4.6, Vulkan, and their own API NVN, which actually many engines make use of. Most likely Factorio is using one of the former anyway, so that problem is kind of out of the way, other that having to deal with the extensions and hardware/driver specific behaviors.

Then as they mention the blog, having to adjust the way the GUI works from a PC setup to an handheld.

foolfoolz1 hour ago

when i’ve played games like RCT1 that can handle thousands of guests in the park, 1000s of placed items, each square customized, hundreds of rides simultaneously with real physics, it makes me wonder why factorio needs such intense system requirements for a mostly 2d production game

SpacePortKnight8 hours ago

Factorio's official requirement for x86 is a dual core 3.0Ghz processor & yet it's able to run on Switch which has a very weak 1Ghz quad core cortex-A57 ARM CPU.

How is this possible? I would imagine CPU requirements to be more or less same across any resolution / operating system.

This is what makes Nintendo Switch interesting to me. It's CPU is even less powerful than an Raspberry Pi 4. Even midrange android smartphones today are much more efficient and powerful than Switch and yet Switch can run Doom / Skyrim just fine.

elihu58 minutes ago

Part of it might just be that they have lower expectations for Switch in terms of the CPU being able to keep up with a large megabase. They expect players to be able to launch a rocket without any noticeable lag, but one-rocket-per-minute bases might be a bit much.

Also, they mentioned in the previous blog post that they've done some optimization to keep the framerate from bogging down, so maybe even the x86 requirements are lower these days (or will be when those optimizations show up in the public version, which might not have happened yet).

Johanx646 hours ago

Switch can't run Doom "just fine", it downscales down to 360p frequently and chogs between 20-30fps. It's barely playable. Mind you, Doom is one of the better optimized games of this gen. And running it sub~60fps on with all settings turned down to ultra low is a sin.

Factorio is pretty well optimized too, however the factory size Switch can handle are on the - can launch the rocket - scale. This is but a small fraction of the factory size people end up building

izacus4 hours ago

> Switch and yet Switch can run Doom / Skyrim just fine.

That "just fine" hides a massive understatement on just how compromised these games are on Switch. They usually run on settings even below lowest possible on PC and regularly drop resolution way down to even 640x360, making everything extremely oily and blurry.

These games run and can be enjoyable - but "fine" is not really a word that fits into their performance :)

Macha3 hours ago

A modern 1.6ghz laptop cpu like the 1240U is probably fine for factorio.

A Core 2 Duo E8400 at 3ghz probably isn't.

They don't want to test and then list the minimum CPU for every generation of cpu for the last decade or more when listing system requirements. So they go a little higher in the stated requirements than is probably needed with newer gens so people don't get angry and disappointed that their older gen cpu doesn't run well despite having the listed clock speed.

djmips7 hours ago

The Switch CPU isn't actually that terrible. You can run into issues with the number of cores. The main thing you will find is that generally most codebases are full of potential optimizions but they aren't acted on until you find yourself constrained.

packetlost7 hours ago

The platform variance for x86/x64 CPUs is... way bigger. The actual instructions per-clock could be wildly different and has massive impact on performance than just the clockspeed.

Cyberdog8 hours ago

Because the Switch is running Factorio on top of a bit of code optimized for running games. A PC is running Factorio on top of a full-featured general-purpose OS, and most PC users are going to be running other things concurrently; web browsers, Electron messaging apps, malware, etc.

Of course, being able to target a single hardware platform with very minor differences like the Switch also means the ability to make optimizations to that specific platform without having to care about possibly breaking compatibility with others. It'd be like being able to optimize your game for people with Nvidia cards and completely ignore those with ATI, Intel, or any other brands on the PC.

bombcar12 hours ago

It's still a year away according to the end of the blog, but it's nice to get an insight into the amount of work necessary for a port.

(oops, that was the expansion, misread)

neogodless12 hours ago

> But we are releasing on 28th October 2022

Unless I'm misunderstanding this section, that's about 5 weeks away.

> it still won't be ready sooner than in a year from now

This is a reference to the expansion.

guidopallemans12 hours ago

This comment was about the upcoming Factorio expansion.

jjmorrison10 hours ago

Factorio is the best game I've ever played. It's so good.

dvfjsdhgfv13 hours ago

I was so excited when I saw the Allegro library in the 90s! I lost track of it later and believed it was dead (I believe the author went to Microsoft to work on DirectX). But lo and behold, I've just checked what libraries the Factorio guys used - and what a pleasant surprise!

hoten12 hours ago

Yup, allegro is alive and well as version 5. But it's pretty much entirely different.

mcphage14 hours ago

This came as a total surprise... I'm impressed they managed to get the game running well on the Switch!

Will I actually buy it again, just to have it on the Switch?

...yes. Yes, I will.

kergonath13 hours ago

I would absolutely love an iPad version. Much more than the Switch version (which I am going to get anyway).

Sakos13 hours ago

It would certainly blow the Switch version out of the water performance-wise.

mcphage10 hours ago

It would... on the other hand, iPads also cost a lot more.

kergonath9 hours ago

It’s more a case of playing it on an iPad I already have. Otherwise yes, getting an iPad specifically for Factorio is some serious commitment.

MBCook12 hours ago

That sounds great to me. And the iPad has a better screen and still supports PS/Xbox/Switch controllers.

But there would have to be a touch only interface and that may be the killer.

ls61210 hours ago

Well if they port it to Apple Silicon macs making an iOS build shouldn’t be crazy difficult right? (Famous last words)

duskwuff8 hours ago

Still waiting on the Apple Silicon port. The Mac build of the game is still x86-only.

hatware11 hours ago

Might be the only thing that can utilize all the power of an M1 Pro!

krallja9 hours ago

The devs have talked about performance bottlenecks a lot - the real benefit of Factorio on the M1 would be the RAM interconnect, as most of the performance issues are related to RAM latency. Upgrading your PC from (e.g.) DDR3 to DDR4 gives you a whole lot more FPS per $ than upgrading your graphics card or CPU.

wtallis8 hours ago
kergonath9 hours ago

Sounds like the M1 is Taylor-made for this, then! The memory bandwidth is insane and latency is great.