Raspberry pi3 screen orientation . Flip? Help

[pokerparties]

I have a raspberry pi3 using retropi in a custom made sit down style table top game unit . I need to flip the screen to fit a TV .
How can I do this ?

Help
Thank you

[IanDaemon]

@pokerparties 180 degree flip? Rotate?

Do you mean 180 degree flip for player two? That's done in the ROM. If the manufacturer didn't plan for it then you're out of luck having player one different from player two.

Rotate the screen? This can be done with a shader.

Split the screen and mirror the output like "Arcade1Up's Street fighter table"? This can be done with a shader.

[IanDaemon]

Here are some cool shaders that I use:

https://retropie.org.uk/forum/topic/23763/cocktail-cab-project/23

[pokerparties]

@iandaemon

Yes I’m trying to flip 180 to fit a TV screen

[IanDaemon]

@pokerparties Flipping the screen 180, just makes it "upside down". Do you mean 90 degrees, similar to the difference between 'portrait' and 'landscape'?

If so, then you can just use a shader in Retroarch. That's what I do. Regardless, shaders are the way to go. (There is a "hardware" route to go with the "Pi 3" that you can't do on the "Pi 4", but I think it's CPU intensive.) You'd get better performance with shaders.