In shaders it's common to use normalized coordinates with [0,0] being the centre extending to [-0.5,0.5] on each axis. There are lots of advantages. It makes a

In shaders it's common to use normalized coordinates with [0,0] being the centre extending to [-0.5,0.5] on each axis. There are lots of advantages. It makes a lot of the math simpler. Shader programming probably isn't the best place to start for beginners though.