Sebastian Schöner @s4schoener

programming! - previously: @epicgames, @unity3d, @pdx_dev_studio, @Chasing_Carrots

 Stockholm, Sweden
blog.s-schoener.com
Joined March 2016
I am doing something new! I am now independent and will be doing contract work plus fiddle with some of my own projects. Feel free to get in touch if you want to rent parts of my brain some time.
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Sebastian Schöner retweeted
Live++ @liveplusplus
Nov 6
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_li… #cpp
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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-…

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...

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Hard links, hard times: deleting files on Windows while they are still in use blog.s-schoener.com/2025-10-…

Hard links, hard times | Sebastian Schöner

On Windows, you can’t delete a file while someone else is watching you using it. Or so they say. On Mac or Linux, you can totally delete a file while someone else is using it. This difference has...

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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-…

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....

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Async, too much blog.s-schoener.com/2025-09-…
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How I accidentally served as the control group for an AI experiment blog.s-schoener.com/2025-09-…

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...

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How my attitude to "unfinished" code changed blog.s-schoener.com/2025-09-…

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...

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Unreasonable within reason blog.s-schoener.com/2025-08-…

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...

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On a quest to become more naive. blog.s-schoener.com/2025-08-…

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...

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Sebastian Schöner retweeted
Daniel Hooper
 @DanielcHooper
Aug 13
⭐️ New Article: Snooping On Slow Builds (Using syscalls)
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Toying around with C vs. C++ compile times: blog.s-schoener.com/2025-08-…

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...

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What I learned about debug performance of C++ vector math: blog.s-schoener.com/2025-08-…

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...

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How to speed up random memory accesses blog.s-schoener.com/2025-07-…

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....

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How to iterate over section data in C++, and a disappointing conclusion blog.s-schoener.com/2025-07-…

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...

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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-…

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...

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Making stupid mistakes: blog.s-schoener.com/2025-07-…

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 avoidab...

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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-…

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...

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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-…

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....

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Invisible loads and a case for non-member functions blog.s-schoener.com/2025-05-…

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...

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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-…

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...

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