/vr/ - Retro Games

Using a superwide 3840x480 resolution on a monitor like http://emulation.gametechwiki.com/index.php/Display_FAQ#CRT_Monitors recommends, and everything worked up until I tried using the interlacing.cg shader as instructed, where it looks like pic related. What did I do wrong? I have my config set up like this https://gist.github.com/Monroe88/dbd3e01252afa5c50690 so I don't know why the shader isn't working properly (I should add that 3840x240 works but that has its own issues with scaling that make it less desirable).