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Day 9 (Advent of Code 2020)
Day 9’s problem statement is convoluted - the “ah maybe that’s why I don’t usually do Advent of Code” kind of convoluted, but let’s give it a go anyway.
So, we have a series of numbers, like so:
35
20
15
25
47
40
62
55
65
95
102
117
150
182
127
219
299
277
309
576
And uh the first N numbers are a “preamble” and every number that comes after that must be the sum of any two of the numbers that come before it.
Things that can go wrong when downloading
When I get a little bit too emotional about my current baby, the itch.io app, there’s always a timely support ticket reminding me that it is currently, still a glorified game downloader.
However true that is, that doesn’t mean it’s easy! In the past year, I’ve had to account for a bunch of failure conditions that can happen, some of which I didn’t realize were even possible. Let’s review them, for fun!
Running an executable without exec
In part 1, we’ve looked at three executables:
sample, an assembly program that prints “hi there” using thewritesystem call.entry_point, a C program that prints the address ofmainusingprintf- The
/bin/trueexecutable, probably also a C program (because it’s part of GNU coreutils), and which just exits with code 0.
We noticed that when running entry_point through GDB, it always printed the
same address. But when we ran it directly, it printed a different address on
every run.
Just paying Figma $15/month because nothing else fucking works
My family wasn’t poor by any stretch of the imagination, but I was raised to avoid spending money whenever possible.
I was also taught “it’s a poor craftsman that blames their tools”, which apparently means “take responsibility for your fuckups”, but, to young-me, definitely sounded more like “you don’t deserve nice things”.
I was also taught from an early age that I was born a sinner, incapable of doing good by myself, and that all the earthly things were temptations, sent by the devil to corrupt me (further I guess?) but also temporary, and that I shouldn’t attach myself.
Fast font packing for fun and profit
Being creative is hard work, let’s go optimizing instead! My graphics engine dye was pretty naive about displaying text, and it was wasteful. Let’s see how I made it all better with this one weird tip.
Disclaimer: Even after a few years I’m still very much an OpenGL newbie. Please don’t hit me with crowbars.
Once upon a time, OpenGL was easy to use - and also falling out of relevancy as far as high-performance 3D graphics were concerned. But it wasn’t all bad! You could basically pick up any library out there and integrate it with your existing GL project. Not that it’s a good idea, but it usually just worked.
The many rewrites of the itch.io desktop app
I started working on the itch.io desktop app over 4 years ago.
It has arguably been my main project ever since, along with companion projects like butler, capsule and many smaller libraries.
I’m fuzzy on the initial history, but I remember the codebase went through a lot of changes. As early as 2014, the whole codebase was ported from vanilla JavaScript to TypeScript. In 2016, I released a timeline of all the changes. In 2018, I released a postmortem for v25 (which I then deleted).
Game Design: The Binding of Isaac
In hours, I have played more of The Binding of Isaac than any other game in my Steam library. Edmund McMillen said he wasn’t expecting it to be a hit, and has since proceeded to be proven thoroughly wrong.
It is kind of a big deal among a certain crowd: as I’m writing this, the second season of the Binding of Isaac Racing League, hosted and commented by Crumps, is in full swing - even though the game was certainly not designed for that!
Ludum Dare #25 Post-mortem
Last week-end, I participated to Ludum Dare for the fourth time in a row!
Downloads: Linux (64) | OS/X | Windows
Story
So here is our entry: Legithief. The backstory is simple, yet cunning: you are an ordinary thief practicing ordinary acts of thievery in the houses of ordinary people to make a living. But one day.. you are quietly robbing yet another home, when you are suddenly smashed in the head with a bat.
Catching up with async Rust
In December 2023, a minor miracle happened: async fn in traits shipped.
As of Rust 1.39, we already had free-standing async functions:
pub async fn read_hosts () -> eyre:: Result < Vec < u8 >> {
// etc.
}
…and async functions in impl blocks:
impl HostReader {
pub async fn read_hosts ( & self ) -> eyre:: Result < Vec < u8 >>
