A super-simple shader can free pixel stretching and position translation on the XY axis.

[crashGG]

A super-simple shader refined from the super-fast crt-cyclon.fx,It only provides the functions of free pixel stretching and position translation on the XY axis. Suitable for users who only want to fine-tune the screen zoom and position and do not like the bundled CRT-like effects.Fixed some bugs in the original version, adjusted the step progress and the range.

Some games have black borders on the top and bottom of the screen that are difficult to remove.like Tekken 3:
crop: all boarders
wildscreen rendering on
Black borders on the top and bottom

crop: only overscan area
wildscreen rendering on
The black border at the top has been reduced, but a few pixels have been cropped at the bottom.The proportions of the screen are incorrect, the characters are squeezed and become thin and long.

crop: all boarders
wildscreen rendering on
Custom Aspect Ratio: 83:50
Post shader: XY-Pos-free
Zoom Image X:0.0665
Zoom Image Y:0.0665
Image Center X:-3.32
Image Center Y:-4.17

a perfect 16:9 screen:

Some games have incorrect aspect ratio, such as tomb raider 3:
4:3 original:

16:9 wildscreen rendering on:

Custom Aspect Ratio: 13:9
wildscreen rendering on
Post shader: XY-Pos-free
Zoom Image X:0.1875
Zoom Image Y:0
Image Center X:-9.38
Image Center Y:0
a perfect 16:9 screen:

[PatrickvL]

What is the purpose of these two lines?

[crashGG]

As I wrote in the description, this shader is simplified and refined from crt-cyclon.fx. You are welcome to continue to simplify and optimize the code.