Quaddicted: Quake Expo 2011 — Berserker@Quake2, Heavily Modified idTech2 Engine, by Borodulin Serge

"Berserker@Quake2 is the heavily modified idTech2 engine, based on quake2-3.21 source code. OpenGL renderer uses the classic forward rendering technology. Main feature is per-pixel lighting (PPL) and real-time shadowing using stencil shadow volumes. Lights/Shadows processing based on Tenebrae source code."