Sebastian Schöner
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sschoener.bsky.social
Sebastian Schöner
@sschoener.bsky.social
660 followers 50 following 300 posts
Programming! - previously at Epic Games, Unity Technologies, Paradox Dev Studios

https://blog.s-schoener.com
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sschoener.bsky.social
Every once in a while, I check the reviews on my games on Steam. It's always nice when a game finds the exact player it was made for. New review from July:

"We Love this game, it plays as advertised." (store.steampowered.com/app/1584170/...)

How I advertise it:
November 13, 2025 at 8:49 AM
Reposted by Sebastian Schöner
liveplusplus.bsky.social
Is your company interested in trying Live++? Want to know what it can do for you? Curious about its features?

You can now request a live demo through our website - free of charge!
liveplusplus.tech/request_live...

#cpp
November 6, 2025 at 3:46 PM
sschoener.bsky.social
Do you want to improve the performance of your il2cpp Unity projects, without changing your code or your assets? My il2cpp build processor cpp2better is now officially available (on request). Reach out to me, details here: blog.s-schoener.com/2025-11-04-c...
cpp2better, an il2cpp postprocessor | Sebastian Schöner
It’s been a while since I last talked about cpp2better. Time for an official “here it is” post. What is cpp2better? cpp2better is a tool that hooks into your build pipeline for Unity to achieve better...
blog.s-schoener.com
November 4, 2025 at 2:13 PM
sschoener.bsky.social
Do you want to know about what things might go wrong when cross-compiling from Linux to Windows? No? Ah, too bad. Then don't click the link below.

blog.s-schoener.com/2025-09-29-c...
What can go wrong in cross compilation | Sebastian Schöner
I have been unfortunate enough to embark on a journey of C++ cross-compilation, by choice nonetheless. In my case, I use clang to compile on a Linux machine to get binaries for a Windows machine. This...
blog.s-schoener.com
September 30, 2025 at 10:16 AM
sschoener.bsky.social
Async, too much
blog.s-schoener.com/2025-09-22-a...
Bilbo: "After all, why not? Why shouldn't I make this async?"
September 23, 2025 at 8:52 AM
sschoener.bsky.social
How I accidentally served as the control group for an AI experiment
blog.s-schoener.com/2025-09-17-c...
How I became the control group in an AI experiment | Sebastian Schöner
At the risk of alienating almost everyone reading this blog, I wanted to report some first hand experience of interacting with AI for programming. I specifically want to talk about how I accidentally ...
blog.s-schoener.com
September 17, 2025 at 9:28 AM
sschoener.bsky.social
How my attitude to "unfinished" code changed blog.s-schoener.com/2025-09-08-t...
TODO TITLE | Sebastian Schöner
In the past, I used to work in a codebase that had a lot of // @TODO: comments in it. Those TODOs would rank from obvious, small improvements to calls for features that would require an entire rewrite...
blog.s-schoener.com
September 10, 2025 at 9:21 AM
sschoener.bsky.social
Unreasonable within reason blog.s-schoener.com/2025-08-29-r...
Unreasonable within reason | Sebastian Schöner
Over the years I have come to appreciate “unreasonable” coworkers. What a weird sentence to write, right? When it comes to programming, you are usually fairly well advised to be “reasonable.” For exam...
blog.s-schoener.com
August 29, 2025 at 9:06 AM
sschoener.bsky.social
On a quest to become more naive.
blog.s-schoener.com/2025-08-19-s...
Speaking with curiosity | Sebastian Schöner
I had two interactions recently that surprised me in light of how I think about this blog. In the first interaction, someone referred to me as a “performance expert.” Thank you, that’s very kind of yo...
blog.s-schoener.com
August 19, 2025 at 8:52 AM
sschoener.bsky.social
Toying around with C vs. C++ compile times: blog.s-schoener.com/2025-08-13-c...
Does C compile faster than C++? | Sebastian Schöner
I recently found myself wondering whether it is faster to compile C than C++. On some level, the answer to this is an obvious “yes”: You can’t accidentally summon cthulhu SFINAE-thulhu in your C code,...
blog.s-schoener.com
August 13, 2025 at 10:27 AM
sschoener.bsky.social
What I learned about debug performance of C++ vector math: blog.s-schoener.com/2025-08-07-v...
Vector types and debug performance | Sebastian Schöner
For reasons, I have found myself writing a vector math library. Like Aras some time ago I’ve found an unpleasant surprise when looking at the debug performance of some vector types. There is no point ...
blog.s-schoener.com
August 7, 2025 at 12:21 PM
sschoener.bsky.social
How to speed up random memory accesses
blog.s-schoener.com/2025-07-28-r...
How to speed up random memory accesses | Sebastian Schöner
At some point when optimizing software, you are left with a soup of pointers that you just have to dereference, even though you know that you are going to suffer a cache miss for every single read. Co...
blog.s-schoener.com
July 29, 2025 at 11:12 AM
sschoener.bsky.social
How to iterate over section data in C++, and a disappointing conclusion blog.s-schoener.com/2025-07-14-s...
How to iterate over section data in C++ | Sebastian Schöner
Last time, we looked at callbacks you can directly embed into your binaries on Windows that are then called for every thread on start/end. The runtime is using this to initialize thread-locals that re...
blog.s-schoener.com
July 15, 2025 at 6:57 PM
sschoener.bsky.social
How to get thread create/exit callbacks on Windows, and learn a little bit about TLS on the way

blog.s-schoener.com/2025-07-07-t...
How to get thread create/exit callbacks on Windows | Sebastian Schöner
I recently needed to run a callback on thread shutdown and creation, on Windows. For exiting, you can apparently use FlsAlloc (MSDN), which is a part of the Fiber API. I’ve tried that, it works. But t...
blog.s-schoener.com
July 7, 2025 at 6:57 AM
sschoener.bsky.social
Making stupid mistakes:
blog.s-schoener.com/2025-07-04-s...
Stupid mistakes | Sebastian Schöner
Quite often, I see this: Forget it, I’m stupid, this is all wrong. or Sorry, I broke it, it was a stupid and unnecessary mistake. While some mistakes are actually unnecessary and completely avoidable,...
blog.s-schoener.com
July 4, 2025 at 11:20 AM
sschoener.bsky.social
I had to debug a crash that turned out to be caused by a misunderstanding of how the Windows linker deals with data imports, and I did not find this documented anywhere. So I fixed it:

blog.s-schoener.com/2025-06-15-w...
How does the Windows linker handle exported data? | Sebastian Schöner
I recently had to understand the details of what happens when on Windows you have a global variable in a DLL and try to use it from another. I did not find this spelled-out anywhere, so let’s change t...
blog.s-schoener.com
June 15, 2025 at 6:16 PM
sschoener.bsky.social
How The Mods Made Me: An unexpected blast from the past turned into a retrospective on creating games as a kid of the early 90s.

blog.s-schoener.com/2025-05-18-m...
How The Mods Made Me | Sebastian Schöner
Recently I got a message from someone that ran into a performance problem with a tool I wrote 15 years ago. On shutdown, the program would completely grind the entire machine to a halt for 3 minutes. ...
blog.s-schoener.com
May 19, 2025 at 9:07 AM
sschoener.bsky.social
Invisible loads and a case for non-member functions blog.s-schoener.com/2025-05-08-i...
Invisible loads and why I like free-standing functions | Sebastian Schöner
I have been grappling with a really silly C++ problem for a long time: I don’t like member functions, but I need to write member functions to get a decent programming UX. Member functions give me two ...
blog.s-schoener.com
May 8, 2025 at 9:35 AM
sschoener.bsky.social
A few words intended to end any romantic notions of how much effort your compiler can even put into passing stuff by value: blog.s-schoener.com/2025-04-30-b...
Passing stuff by value and ABIs | Sebastian Schöner
I have in the past had this very romantic belief that when you pass a struct by value the compiler will lovingly select the right combination of registers to carefully craft the perfect packing of you...
blog.s-schoener.com
April 30, 2025 at 1:40 PM
sschoener.bsky.social
My notes about how Unity's ECS handles dependencies, or "Data-soup with long noodles." blog.s-schoener.com/2025-04-25-d...
Data-soup with long noodles | Sebastian Schöner
This is a post about Unity’s ECS (as of Unity 6) and how it handles dependencies between jobs. The other day a friend asked: “Why are the different methods of scheduling work in Unity’s ECS so inconsi...
blog.s-schoener.com
April 25, 2025 at 10:10 AM
sschoener.bsky.social
Optimization at the speed of 1.6 Kilo-Fredriksson with cpp2better
blog.s-schoener.com/2025-04-17-k...
Optimization at the speed of 1.6 Kilo-Fredriksson | Sebastian Schöner
I have already introduced my latest project cpp2better in a previous post. I have made good progress and wanted to share some results. I have had the chance to test my tool on more projects now and ca...
blog.s-schoener.com
April 17, 2025 at 8:21 AM
sschoener.bsky.social
Did you know that engines like Unity aren't build from scratch and have dependencies? For example the excellent tundra build system. In the spirit of supporting some of the bedrock of our industry, I am now sponsoring Tundra development. github.com/deplinenoise
deplinenoise - Overview
deplinenoise has 39 repositories available. Follow their code on GitHub.
github.com
April 15, 2025 at 8:11 AM
sschoener.bsky.social
GPU Hang Adventures and the things I learned that you, the graphics programmer, probably already know
blog.s-schoener.com/2025-04-08-g...
GPU hang adventures | Sebastian Schöner
After the last post, you might think that I have spent most of my time lately with IL2CPP. That, however, is untrue: I have actually mostly been looking at GPU hangs. I would by no means call myself a...
blog.s-schoener.com
April 8, 2025 at 10:21 AM
sschoener.bsky.social
A mini-announcement about Unity games, performance, and IL2CPP codegen:

blog.s-schoener.com/2025-04-07-c...
IL2CPP, but better | Sebastian Schöner
IL2CPP is Unity’s AOT solution for C#, which takes compiled C# in the form of IL-code and turns it into C++ code, which can then be compiled using regular native toolchains. I have looked at a lot of ...
blog.s-schoener.com
April 7, 2025 at 9:40 AM
sschoener.bsky.social
Bool4 and some unexpected new perspective
blog.s-schoener.com/2025-03-31-b...
bool4 and an unexpected new perspective | Sebastian Schöner
This blog post is 20 paragraphs exposition and 2 paragraphs punchline. It is a follow-up to my previous post on vectorization. I mentioned there that Unity’s math package implements bool4 like this: s...
blog.s-schoener.com
April 2, 2025 at 9:41 AM