iiinova — where your digital self keeps evolving

Mattias Gustavsson @mattiasg.bsky.social · 31/07/2026

Finally made a browser version of what is probably the best game I’ve made: mattiasgustavsson.itch.io/extrication

mattiasgustavsson.itch.io

Extrication by Mattias Gustavsson

A small point-and-click style adventure game.

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Mattias Gustavsson @mattiasg.bsky.social · 31/07/2026

Check out Yarnspin, my free, open source, game engine for story games: mattiasgustavsson.itch.io/yarnspin

mattiasgustavsson.itch.io

Yarnspin by Mattias Gustavsson

The Story Telling Engine

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Mattias Gustavsson @mattiasg.bsky.social · 11/02/2026

Here's a pretty efficient quicksort implementation in macro form for C. It being a macro means the compare function can be inlined instead of being through a function pointer. Code is a horrible macro mess, but it works gist.github.com/mattiasgusta...

gist.github.com

Sort macro for C

Sort macro for C. GitHub Gist: instantly share code, notes, and snippets.

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Mattias Gustavsson @mattiasg.bsky.social · 03/02/2026

Is there a good online community (discord or whatever) for disussing specifically C programming (and only C programming), without being centered around a specific codebase? And to be precise, hand coded C, not AI generated or vibe coded. Got any tips for such spaces?

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The Bishop Of Hobb-ins @fishwithlasers.bsky.social · 10/01/2026

we’ve got somewhere to stay after the fucking place flooded again, just a room tho, I’ve just managed to pack the bare minimum and I’m skint beyond words. I am so sorry, this has all gone to shit. Can anyone help with emergency survival funds? www.paypal.com/paypalme/ret... ko-fi.com/robfearon

paypal.com

Pay Emma Fearon using PayPal.Me

Go to paypal.me/retroremakes and type in the amount. Since it’s PayPal, it's easy and secure. Don’t have a PayPal account? No worries.

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Mattias Gustavsson @mattiasg.bsky.social · 04/01/2026

I've created a repo for it on github, and I will use the "discussions" feature to talk about it: github.com/mattiasgusta... If you are interested in the project, or want to contribute ideas or even code, feel free to join the discussions :)

github.com

mattiasgustavsson pixie_game_system · Discussions

Explore the GitHub Discussions forum for mattiasgustavsson pixie_game_system. Discuss code, ask questions & collaborate with the developer community.

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Mattias Gustavsson @mattiasg.bsky.social · 04/01/2026

Last year, I started prototyping a fantasy console, but didn't really get it off the ground the way I'd hoped. This year, I want to really make some headway, and move from prototyping to start working on it properly. I've named it "Pixie Game System"

"Pixie Game System" in white-on-black badge on top of rainbow lines

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Mattias Gustavsson @mattiasg.bsky.social · 04/01/2026

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Mattias Gustavsson @mattiasg.bsky.social · 31/12/2025

This past year has, without a doubt, been the toughest year ever for both my wife and me. I do feel hopeful about the year to come, and we do believe the worst is behind us. I hope all of you will get a great 2026.

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Mattias Gustavsson @mattiasg.bsky.social · 16/12/2025

implementing a custom codegen backend for TCC is tricky...

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Mattias Gustavsson @mattiasg.bsky.social · 21/07/2025

I am excited to share this new single-header C library I have been working on for a while now: vecmath.h, a comprehensive vector/matrix math library for graphics/games/3d. It allows you to write vector math code in C that looks like this:

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Mattias Gustavsson @mattiasg.bsky.social · 31/08/2025

I tried my hand at making a video codec. I didn't know the first thing about video codecs when I started, so was quite fun to learn about the concepts and how to implement them. I packaged the result in a stb-style, single-file header-only lib, < 2500 loc with no dependencies.

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Mattias Gustavsson @mattiasg.bsky.social · 01/11/2025

what are the worst things about the modern day internet?

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BΞRNH∆RD @schelling.bsky.social · 11/10/2025

Got back into using the video editing features of Blender to make a trailer for some of my open source shenanigans - Announcing: DOSBox Pure Unleashed 🥳 www.youtube.com/watch?v=t4q8...

youtube.com

DOSBox Pure Unleashed

YouTube video by Psyraven

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Mattias Gustavsson @mattiasg.bsky.social · 31/08/2025

The single header lib also includes source code for an encoder utility and a playback app (both which makes use of other single header libs), behind conditional compile switches (ifdefs). Instructions for how to build them can be found at the top of the file.

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Mattias Gustavsson @mattiasg.bsky.social · 31/08/2025

The code is public domain, and available here github.com/mattiasgusta... For most uses, you are probably better off using a real codec. But for something small, simple, self-contained with no dependencies, this might fit the bill.

github.com

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Mattias Gustavsson @mattiasg.bsky.social · 31/08/2025

The videos in the examples are compressed with my "default" setting, which makes them quite small, with ok-ish quality. On "max" they are more like dvd in size/quality. I focused on avoiding temporal aliasing, and I think i pulled that off quite well.

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Mattias Gustavsson @mattiasg.bsky.social · 31/08/2025

All in all, it seems like my quality/compression is maybe around dvd quality (?), so not in the same league as modern codecs (but attempting that would start to infringe on patents, so I don't particularly want to go down that route).

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Mattias Gustavsson @mattiasg.bsky.social · 31/08/2025

Here are two sample video snippets: mattiasgustavsson.com/wasm/fmv.html mattiasgustavsson.com/wasm/fmvdl.h... (both are displayed with my CRT filter, because that's how I am most likely to be using this myself, but it can be toggled with F9).

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Mattias Gustavsson @mattiasg.bsky.social · 31/08/2025

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Mattias Gustavsson @mattiasg.bsky.social · 01/08/2025

Round a uint32 up to the nearest power-of-two value: gist.github.com/mattiasgusta...

gist.github.com

pow2_ceil.h

GitHub Gist: instantly share code, notes, and snippets.

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Mattias Gustavsson @mattiasg.bsky.social · 21/07/2025

If you're looking for a vector math lib for C (or C++) check it out github.com/mattiasgusta... If you do take a look, please let me know what you think about it - getting feedback is a big part of the reward releasing libraries like this, and I spent a lot of time and effort on it

github.com

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Mattias Gustavsson @mattiasg.bsky.social · 21/07/2025

It's been tested on windows, mac, linux and web-assembly, using msvc, clang, gcc and tcc (tiny c compiler).

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Mattias Gustavsson @mattiasg.bsky.social · 21/07/2025

It is not trying to be the most optimized library, not using any SIMD intrinsics or assembly code, just straightforward, fully portable, simple implementations of a large number of math functions.

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Mattias Gustavsson @mattiasg.bsky.social · 21/07/2025

It has a large set of functions, as it attempts to implement most of what you get in shader languages like HLSL and GLSL, and also most of the utility functions from libraries like D3DX in DirectX.

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Mattias Gustavsson @mattiasg.bsky.social · 21/07/2025

Even though it is primarily designed as a C library, I have also tried to make it fairly nice to use from C++, conditionally adding operator overloads and constructors, but it is not trying to be idiomatic "modern C++" in any way.

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Mattias Gustavsson @mattiasg.bsky.social · 21/07/2025

Here is the library: github.com/mattiasgusta... Now, you get the best ergonomics if you use it with clang compiler in C11 or later, as it makes (optional) use of C11 _Generics and clang vector type extension, but it doesn't require either to work.

github.com

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Mattias Gustavsson @mattiasg.bsky.social · 21/07/2025

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Mattias Gustavsson @mattiasg.bsky.social · 29/06/2025

The engine also includes an editor for adjusting images, implemented using a custom basic imgui system. I've written a bit about it here: mattiasgustavsson.itch.io/yarnspin/dev...

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Mattias Gustavsson @mattiasg.bsky.social · 29/06/2025

This is what my dev environment looks like when I'm making a game in Yarnspin. I use notepad++, with a custom color scheme, with the "folder as workspace" to get a tree view for both scripts and image files. And with keyboard shortcuts for run/compile and go to error.

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Mattias Gustavsson @mattiasg.bsky.social · 29/06/2025

The custom script language for Yarnspin is made to be simple, and without a lot of notation or complex syntax. Mostly it's just specifying images and text to display, listing options to choose from and where they lead to

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Mattias Gustavsson @mattiasg.bsky.social · 29/06/2025

It was made in about a week, using my Yarnspin game engine, which is written in plain C using only stb-style single header libraries github.com/mattiasgusta...

github.com

GitHub - mattiasgustavsson/yarnspin: A simple story-telling game engine

A simple story-telling game engine. Contribute to mattiasgustavsson/yarnspin development by creating an account on GitHub.

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Mattias Gustavsson @mattiasg.bsky.social · 29/06/2025

You can play it for free here: mattiasgustavsson.itch.io/neon-lies I think it's one of the best games I've ever made 😀

mattiasgustavsson.itch.io

Neon Lies by Mattias Gustavsson

A Cyberpunk Adventure

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Mattias Gustavsson @mattiasg.bsky.social · 29/06/2025

I'd like to talk a bit about this a game I made, all done in plain C, using only single header libraries, and it runs in the browser too. It's called "Neon Lies" and it's a retro-futuristic cyberpunk story in a William Gibson style setting.

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Mattias Gustavsson @mattiasg.bsky.social · 09/07/2025

Does the idea of making a game in plain C, without using an off-the-shelf engine, appeal to you, but you don't really know how to go about it? Here's "Repair/Rearm", a game I made using only a handful of single-header libraries, but without an engine,it's just the game code doing only what's needed

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Mattias Gustavsson @mattiasg.bsky.social · 29/06/2025

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Mattias Gustavsson @mattiasg.bsky.social · 29/06/2025

"dos-like" is a mini-engine/framework I made a couple of years ago. It makes it easy to make games and other things with a 90s MS-DOS look and feel, but using a modern C compiler and running on Windows, Linux, macOS and in the browser using WebAssembler.

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Mattias Gustavsson @mattiasg.bsky.social · 29/06/2025

Here is one of the first single-header libs I wrote, for reading and writing .ini files github.com/mattiasgusta... I like .ini files because they are so simple and easy to understand and edit even for non-technical people. Sure, they are not as capable as, say, json/xml. That's ok.

github.com

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Mattias Gustavsson @mattiasg.bsky.social · 29/06/2025

Here is another small single-header library that I use all the time: frametimer.h In the basic case, it just measures the delta time between frames, using high precision timers on all platforms. But, it can also lock to a specific fps, and uses very high precision timers to wait

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Mattias Gustavsson @mattiasg.bsky.social · 04/06/2025

Updated my app.h C library to support standard gamepads, for both windows, osx/linux and wasm. There's a web build here for trying it: mattiasgustavsson.com/wasm/gamepad... Library can be found here: github.com/mattiasgusta... I also updated the app.h template project: github.com/mattiasgusta...

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Mattias Gustavsson @mattiasg.bsky.social · 03/06/2025

My app.h library is sorely missing gamepad support. But not for long 🙂

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Mattias Gustavsson @mattiasg.bsky.social · 10/04/2025

Know what’s great? Good old .ini files. Very easy to understand and edit, even for non-programmers. Here’s my single-header C library for reading and writing .ini files. One of the first single header c libs I wrote, and I still use it all the time 🙂 github.com/mattiasgusta...

github.com

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