Basically, yes. A shader is basically a function which passes in the x,y coords and spits out a color, and this is done for every pixel on the screen. So a sim

Basically, yes. A shader is basically a function which passes in the x,y coords and spits out a color, and this is done for every pixel on the screen. So a simple shader would be something like (in pseudo code): function shader( x, y ) { if( x > 0.5 ) return white; else return black; } would color one half of the screen black, and the other white.