I'm using DBGL (a great dosbox frontend http://members.quicknet.nl/blankendaalr/dbgl/) for all my dosbox needs and everything works fine but I can't get pixel shaders to work.
I've downloaded a few shaders, extracted them into ./dbgl/dosroot/shaders directory but they won't show up on the display config tab.

Does anyone here know how to make dosbox linux use pixel shaders?

Thanks in advance!