Blog
Problems I have worked through, written up, plus small demos you can try in the browser. Each card starts with a one-line summary in plain words.
A 2012 game's maths gives slightly different answers on a modern 64-bit build. Why that happens, and how I made both builds agree.
x87 precision, Direct3D 9 and a 64-bit reconstruction: why the same float formula gives two answers, and how precision became an explicit parameter.
A demo you can play with in the browser: three ways a graphics card can draw see-through hair, side by side.
A WebGL2 playground: the same strands drawn with blending, alpha testing and alpha to coverage.
A timing bug in how my renderer hands finished frames to the screen. My graphics card tolerated it; a checking tool caught it.
A write-after-read synchronization bug in a Vulkan present path, found by a validation layer rather than by symptoms.