An IDE and debugger for the esoteric programming language Piet.

In-depth and low-level knowledge about GPU.

Normally when we implement ray tracing, each ray of light carries a RGB vector. Spectral Ray Tracing is the technique of instead of treating a ray of light as a particle in a straight line, the algorithm treats light as a wave spectrum - spectral power distribution (SPD). This allows more realistic rendering such as dispersion, diffraction, etc.

A 4-part writeup on how GPS works and how to implement a GPS receiver: I/Q data, asynchronous CDMA, GPS C/A and P code, Heterodyne demodulation, etc.

Even life as simple as virus has evolved mechanism of cooperation and competition - on a molecular level. Amazing!

Search images from Reddit and Instagram by semantic meaning or a similar image.

A comprehensive list of frequently seen concepts in electronics.

Netfilter TPROXY target explained.

The part most interest me is how to use Linux network namespace to experiment with network layouts on the same machine.

They look really fun!

Tool to draw/generate funnel diagram from textual input. "Came in a fluffer" style.

Valuable SQLite tips for the use on a production servers.

Chemotaxis is a great slice: it’s a triumph of systems biology—we understand it holistically but also in fine detail at almost every level.

A nice explainer of the JTAG protocol. JTAG started as a protocol for testing connectivity between pins of ICs on a circuit board.

TIL signed distance field. First I need to explain the concept of alpha testing. Alpha testing is a rendering technique for textures. It dictates that when rendering a texture, perform a test on the alpha value of that pixel against a threshold. Completely throw out or keep the data depending on the comparison result. Typically the alpha value for each pixel is set to the actual transparency of the pixel. This signed distance field method calculates the signed distance of each pixel to the nearest color pixels. The signed instance field is then saved in alpha channel in the texture. All the remaining alpha-testing mechanism is the same. It's claimed that this technique improves the rendering quality of low-resolution textures drastically.

Read the original paper: https://steamcdn-a.akamaihd.net/apps/valve/2007/SIGGRAPH2007_AlphaTestedMagnification.pdf

An interactive cheatsheet for the GPIO pins on Raspberry Pi.

Also check out https://microbit.pinout.xyz/ for the GPIO pins for BBC micro:bit.

What Hyperbole does is to add actions to textual patterns.

Interesting insight: A false failure is one that you fix by editing the test, while a real failure is one you fix by editing the code. Some tests virtually never have real failures, so it's better to avoid them. One principle is to test function, not code.

A clever way to implement a htmx-like mechanism of substituting the content of a node with the response of a request.

It works like this. Have a hidden iframe whose onload callback sets the target node (specified by hash) with the iframe's body content. Then use an a element to trigger the iframe load: <a target=_the_iframe href="/req-url#target-element">.

TIL: a[target], iframe[hidden], contentWindow, contentDocument, <base target=X>

This article talks about PGA (projective geometric algebra), an alternative approach to do geometric transformation that is not using matrix.