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echo.parallax.fyi
echo~parallax
@echo.parallax.fyi
120 followers 160 following 190 posts
KHR_materials_dispersion fan

she/they

This is a personal account; all views and opinions are my own.[...]

View full profile at https://app.wafrn.net/blog/echo
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echo.parallax.fyi
MAXIMUM BASEBALL
Bases loaded, 2 outs, 3 balls, 2 strikes!!
October 28, 2025 at 4:42 AM
echo.parallax.fyi
watching baseball
World Series MLB GameDay with Andy Pages at bat. Called strike, foul, foul, foul, ball, ball, foul, foul. That's an excessive number of fouls!
October 28, 2025 at 3:44 AM
echo.parallax.fyi
omg ok I think that worked! I'll be honest, using PDSMOOver was a real "I need someone to hold my hand while I wait for this progress bar" experience but it worked. Here's a test Bitsy
Bitsy a.k.a. Kiki the cat lies in a sunbeam cast through a window.
October 3, 2025 at 8:59 AM
echo.parallax.fyi
It's also my second time playing Chrono Circle! I like it, which I understand is kind of strange. I guess I like that with the way it makes one focus on the mechanics, it feels like the rest of the world falls away while I'm playing it.
100.599 on DJ Noriken's Soldiers; 094.463 on NOMA's Brain Power; 086.537 on kors k vs. Camellia's The Rolling. Only 1 miss on Soldiers!
September 21, 2025 at 6:17 AM
echo.parallax.fyi
y'all heard about that WACCA game? For my second day of playing it ever (counting one credit about two years ago as my first day), I'm really happy with this

Also if the album version of CYCLE HIT is a game then the WACCA version is a boss rush. In this essay I will
0960721 on T VS. SHARK; 0871721 on Möbius; 0980292 on DOUBLE BREAKER XX, all on level 10 or 10+ hard. Only 4 misses on DOUBLE BREAKER XX! WACCA suggests: miss less 0972937 on Cycle Rush Hard.
September 21, 2025 at 6:14 AM
echo.parallax.fyi
Happy to announce that this is me once again
A tweet from Jon Bois re-made in Cohost CSS: [while receiving potentially life-saving vaccine] thanks. Note that I am not Jon Bois, but rather the person receiving the vaccine.
September 16, 2025 at 11:44 PM
echo.parallax.fyi
modern camera systems are so quiet that the job of saying "woooooooooop" on dolly movements now falls to the camera operator, or sometimes an assistant
September 2, 2025 at 2:50 AM
echo.parallax.fyi
I made it back! Now my cat can read about drum 'n' bass
Bitsy aka Kiki the cat sits on the 2016 Hospital Records coffee table book. Kiki aka Bitsy the cat sits on a different page of the 2016 Hospital Records coffee table book.
August 18, 2025 at 9:08 AM
echo.parallax.fyi
hello Seattle! I'm here for a few hours as a side effect of the Air Canada strike — turns out Air Canada was paying flight attendants only US$14600-US$30000 per year according to aviationa2z.com/index.php/20... ! They're on strike now after 240+ days of negotiations.
A strawberry matcha latte in Seattle at Jollidaze Cafe.
August 17, 2025 at 10:47 PM
echo.parallax.fyi
I literally did not even know what was on wplace here, but I think the coincidence is very amusing. anyways here are some other photos from the trip to Vancouver!
Three vegetable buns and a sparkling matcha latte at FUNK Cafe. A gingersnap and an iced latte on a wooden table by a concrete wall at Jazz Cat Coffee. They also had something they called a Catnip Coffee, but it was fairly basic — brewed coffee plus a shot of espresso — so I didn't get it. The two buildings of the Vancouver Convention Centre as rainclouds roll over. The ferry arriving back at Tsawwassen on a sunny day with picturesque clouds.
August 17, 2025 at 6:31 PM
echo.parallax.fyi
in HD, of course!

Also meet me in negative 1967 minutes at the island from Myst to learn more about astronomy. (Did you know that Jupiter, Uranus, and Neptune also have rings? They're just very faint, and Neptune's weren't imaged till 1989. See en.wikipedia.org/wiki/Rings_o...)
A bowl of breakfast poutine, with potatoes, sausage, melted cheese, and a poached egg, garnished with green onion and spices. A road leads into a verdant forest. The sky is filled solid with rainclouds. A panorama. A staircase leads up to an observatory with a neoclassical entrance with blue highlights. That's the Centre of the Universe, an astronomical centre on Vancouver Island. A woman with a pin bag looks up at the observatory. That's me!
August 17, 2025 at 7:47 AM
echo.parallax.fyi
anyways this is me right now
A screenshot of Hawk's Peak Provincial Park from the game A Short Hike, but it's rained out (in reality I haven't made it to a provincial park yet, but I am on a Canadian island and it's raining so I'm reworking my schedule)
August 15, 2025 at 8:00 PM
echo.parallax.fyi
Thank you to everyone who visited our session! All the slides and lab materials (including vk_slang_editor builds for x64 Windows and Linux) are now available online: shader-slang.org/landing/sigg...
The title and agenda for the Introduction to Slang lab. The agenda lists: Language Basics; Using slangc; Porting GLSL; Shader I/O; Debugging and Tools; Structs, Modules, and Interfaces; SlangPy; and Autodifferentiation.
August 15, 2025 at 7:37 PM
echo.parallax.fyi
On Sunday at SIGGRAPH in Vancouver, Chris Hebert and I will run an introductory lab for the Slang shading language! We'll go from basics to advanced features like generics & autodiff, and have multiple activities using a new tool built for this lab!

s2025.conference-schedule.org/presentation...
Slang can take its own language, HLSL 2020, or GLSL (with small modifications) as input, and output SPIR-V, HLSL, GLSL, Metal Shading Language, WebGPU Shading Language, PyTorch, CUDA, OptiX, or C++ code. It can also do a lot more! You can learn more at our talk (or by reading the slides afterwards).
August 7, 2025 at 12:34 AM
echo.parallax.fyi
‪Compute rasterization shader from tonight's Monday Night Bytes: blog.parallax.fyi/compute-rast...

Music: KOAN Sound - Drift (Remix): www.patreon.com/posts/55642704

The Bluesky video encoder really has a hard time with this one. If you download Bonzomatic Compute, you can try it yourself!
May 19, 2025 at 10:02 PM
echo.parallax.fyi
Cleaned-up pixel sorting shader attempt from yesterday's Monday Night Bytes

Music: acloudyskye.bandcamp.com/track/apolog...
April 29, 2025 at 11:26 AM
echo.parallax.fyi
[ c h r o m a t i t e ]

New track from me for Revision 2025! Featuring some custom color bass JSFX, and my own variation of au5's Ultracomb.

blog.parallax.fyi/new-track-fr...

You can vote for it and other Streaming Music tracks here! pm.revision-party.net/voting?compe...
A spectrogram of the linked track. There's horizontal bands in the higher frequencies corresponding to the notes in key, and some wild flanging happening with the bass in the first drop.
April 20, 2025 at 1:25 PM
echo.parallax.fyi
I'm cutting it *really* close to the deadline; this might not happen...

and yes the code for the Reese bass in this track really takes up like 600 lines of code
Commit made just now: "Reese; better Reaper tension curve approximation. 3 files changed, 629 insertions, 56 deletions".
April 19, 2025 at 1:14 PM
echo.parallax.fyi
"spend less on candles" / "no" but it's my demo evaluating like a hundred biquad filters per sample
A Visual Studio performance profiler. 48% of all CPU time goes towards updating biquad filters.
April 19, 2025 at 1:12 PM
echo.parallax.fyi
turns out the one-pole approach causes clicks when it changes polarity! I implemented a FIR phase rotation filter, but then I found someone had designed an IIR phase rotator: yehar.com/blog/?p=368. Now the output's much cleaner, and still 0-latency!
A spectrogram of phased white noise. The frequency and delay of the phaser changes smoothly, and the output's really clean -- even at low frequencies!
April 13, 2025 at 7:38 AM
echo.parallax.fyi
omg I got 0-latency barberpole flanging working!!

Looks like the trick is to rotate the phase of the delay by a constant before adding it back. I think kHs Flanger uses something higher-quality for this (so it needs 16 samples of latency), but I got a cheap version working with a one-pole all-pass!
A spectrogram showing variable-delay flanging -- a series of peaks and notches at regularly spaced intervals -- but the position of the first peak and notch can also scroll up and down! The rest of the image shows a basic UI and more analysis showing it's doing the right thing given a white noise input.
April 13, 2025 at 4:00 AM
echo.parallax.fyi
I'm visiting Germany till 4th May! I think I know a few people from here — this is an open invitation to let me know if you'd like to get coffee or lunch at some point! If you're at Revision 2025, that's even easier.

here's a photo I took at Cafe Luitpold in Munich yesterday!
Mushroom and chicken with puff pastry (two bowls made out of multiple sheets, plus two letter Ls for Luitpold) with sprouts.
April 13, 2025 at 2:56 AM
echo.parallax.fyi
now with polyphony!
April 4, 2025 at 8:43 AM
echo.parallax.fyi
- book is Intel's x86 intrinsics guide. and also static initializers don't work because I'm skipping C runtime startup.

No idea if the demo (which will be an original track) will be ready in time for Revision, but I'm having fun!

also I found another way the ADSR implementation was broken
A waveform of the sound above. The notes appear to start well before the attacks. That's because my decision to use an envelope of max(release, attack) when two notes overlap was not a good decision
April 4, 2025 at 6:52 AM
echo.parallax.fyi
I now have a 1,563 byte .exe; when you launch it, it plays the intro to Periphery's The Way The News Goes... on a sine wave, then closes. It's cute!
April 4, 2025 at 6:52 AM