Sorry, I hope this is the right forum.
Anyway, I would like to do something that looks like an old CRT-TV.
I already got the scan-line and vignette shader (GLSL), now my problem is that I need to slightly "bend" the surface on the edges to the back to create this illusion of an old CRT-TV surface. I am using Game Maker Studio, so I have only 2D capabilities and limited 3d functionality, like drawing models and manipulating matrices.
Can someone help me to get this started?
edit: A picture of what I mean in a game where I saw it. It is very subtle and I hope you can spot it in the screen well enough.