https://bugs.freedesktop.org/show_bug.cgi?id=36236
--- Comment #40 from Marek Olšák maraeo@gmail.com 2011-05-07 08:07:45 PDT --- I was testing Trine on both r300g and r600g and the game seems to render everything correctly (r300g is a little faster though).
You should update Trine to a newer version. There is an updated installer on the Humble Bundle website called 'TrineUpdate2.32.run'.