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CodingKoopa / sdl_debug.md
Last active December 27, 2025 16:44
SDL Wayland Debug

An SDL debug

Problem

I noticed that, for any screen scaling other than 1x, my instance of the OpenLoco game looks blurry on my Arch Linux w/ Sway system. This has the footprint of a XWayland issue; in fact, if I tab over to my Discord client right now then all of the text is blurry because it's (regrettably) using X11. For OpenLoco, though, this seems to be different because the issue only occurs in Fullscreen (regardless of borderless).

I don't want to just trust my eyes, so let's compare a windowed screenshot (good, left) with a fullscreen screenshot (bad, right), both taken with grim via grimshot.

image
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CodingKoopa / GcalTheme.md
Last active June 17, 2025 04:01
Custom Google Calendar Theme

meow meow meow meow

image

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CodingKoopa / 0demo.md
Last active April 7, 2025 21:19
Parallel k-NN ImHex Pattern

Pattern Data view

image

2D viz

image

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CodingKoopa / recover.md
Created January 20, 2025 20:50
Recover Wordfence 2FA Secret

Wordfence is a Wordpress plugin used to protect against automated attacks. Provided with access to MySQL (and MySQL credentials), you can recover the TOTP secret for an account. As discussed in this blog post, Wordfence stores 2FA secrets in plain-text (technically in binary, in a MySQL table). This still works as of Wordfence 8.0.3, but you can check the TOTP source code to see if additional security has been added.

  1. Obtain the database credentials. This can be found in wp-config.php in the WP root. You want $table_prefix (if multiple WP installs), DB_NAME, DB_USER, and DB_PASSWORD. DB_HOST is assumed to be localhost.

  2. Connect to the database:

    $ mysql $DB_HOST --user=$DB_U
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CodingKoopa / notes.md
Created March 26, 2024 05:38
ntfs permission stuff
  1. setup user mapping with ntfs-3g
  2. fix user: chown -R koopa:koopa .
  3. in windows, make sure that subfolder + file permissions are being inherited from the root
  4. in linux, fix file perms: find . -type f -print0 | sudo xargs -0 chmod 644
    • add execute perms within steam library
  5. in linux, fix dir perms: find . -type d -print0 | sudo xargs -0 chmod 755

at this point, things should pretty much be working: newly created documents are rw for the owner (shared between windows and linux), and can optionally be made executable

however, linux creates them as 644, whereas windows-created files show up in linux as 600

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CodingKoopa / ntstatus.h
Created March 9, 2024 03:33
MinGW headers (distributed w/ Cygwin)
/**
* This file has no copyright assigned and is placed in the Public Domain.
* This file is part of the mingw-w64 runtime package.
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
*
* The status values have been taken from
* http://msdn.microsoft.com/en-us/library/cc704588.aspx
* except for the small group of values below.
*/
#ifndef _NTSTATUS_
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CodingKoopa / article.md
Last active April 2, 2025 02:41
Virtual memory in practice

Virtual memory in practice

Hiya! This article will draw some connections between the mechanics of virtual memory and the funny numbers that you see in your operating system's task manager. We will talk about basic systemwide memory statistics as well as per-process properties. The main contribution of this article is illustrating the similarities between Windows and Linux in a way that can be observed using a couple of systems and some curiosity.

Terminology

TODO: Linux does use "commit" in the same way. also, talk about optimistic malloc

TODO: consider https://sw.kovidgoyal.net/kitty/faq/#i-opened-and-closed-a-lot-of-windows-tabs-and-top-shows-kitty-s-memory-usage-is-very-high

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CodingKoopa / bootmain.c
Last active February 25, 2023 05:35
dumb attempt at xv6 bootloader reporting progress over serial (needs to be compiled with `-Os`) [might not actually be correct lol]
// Boot loader.
//
// Part of the boot block, along with bootasm.S, which calls bootmain().
// bootasm.S has put the processor into protected 32-bit mode.
// bootmain() loads an ELF kernel image from the disk starting at
// sector 1 and then jumps to the kernel entry routine.
#include "types.h"
#include "elf.h"
#include "x86.h"
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CodingKoopa / xv6-boot.md
Last active February 26, 2023 07:35
SeaBIOS/xv6 stuff

xv6 boot

boot process

mainly just considering PATA/IDE (QEMU's default interface of choice)

glosses over memory model

Boot process:

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CodingKoopa / 00_readme.md
Last active February 20, 2023 22:27
xkb layout switching issue

I am trying to switch between my default keyboard layout (US, QWERTY) to an alternate layout (US, Dvorak Programmer). I have produced an Xorg config to set this up, but the toggle doesn't work, and the generated source from xkbcomp suggests that it is not being used.

When I run setxkbmap -option "grp:toggle", everything then works (even though this should be redundant with the configuration).

  • 01_xorg.conf.d is my Xorg configuration: everything in /etc/X11/xorg.conf.d. I do not have an /etc/X11/xorg.conf, and my only vendor configurations in /usr/share/X11/xorg.conf.d/ are for associating input devices with libinput (and enabling quirks for certain ones).
  • 02_Xorg.0.log is my Xorg log when booting with this configuration. You can see that the dvp layout is recognized.
  • 03xkb_BEFORE_setxkbmap.xkb is the generated source for this configuration, obtained using xkbcomp $DISPLAY 1.xkb.
  • [`04_xkb_AFTER_setxk