I've had this problem for about a week now. It used to use my graphics card (GeForce GTX 540M) but suddenly the
shaders stopped working. At first I thought it was just because I was on a big build but when I tested on a slate
no brick server they still didn't work. I went and checked my launcher.txt and sure enough the vendor is Intel, not
Nvidia. Obviously I screamed wtf and checked Google. No one else has had this problem as far as I can see. I really
like shaders (Though I do prefer terrain... forget you Kalphiter. Please no flame for this) so I would love it if someone could help me out.
One last thing. I also went to the Nvidia Control Panel and made Blockland us the Nvidia High Performance Graphics Processor. Didn't help.