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I'm David Llewellyn-Jones and this is my homepage. I'm a researcher in network security who's also interested in programming and graphics. You might be interested in my research, my software or my random musings.

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17 Apr 2015 : Back from 2006 #
Yesterday an unexpected server upgrade caused my website to drop back to what it looked like in 2006, which was more than a little disconcerting. After a bit of panic today, and with the help of my hosting provider we've now got the site back to the future again and into its 2015 state. Phew!
12 Apr 2015 : Twitter name change #
I've just changed my twitter name to flypigahoy. Now I get to slowly find all of the places I've linked to twitter from!
1 Apr 2015 : Shadertoy API testing #
There's now a page where you can test the shaders from with shaderback.js. Only shaders not reliant on channel inputs will work, so you may need to click through a few before finding one that renders correctly.
21 Mar 2015 : Shadertoy to shaderback #
It turns out many of the shaders on Shadertoy (at least those not using channel inputs) can be used by shaderback.js with surprisingly little conversion. Take a look at this really rather amazing example by Inigo Quilez.
21 Mar 2015 : Shaderback.js is go #
There don't appear to have been any ill-effects from using shaderback.js, so the default is now to have the animated background enabled. It can still be removed if needs-be. The lack of abstraction using GPU code on the Web is really refreshing; it feels like the '90s, poking colour values direct into the screenbuffer again!