How to create a patch to a game ?

GoW 3 uses MLAA so it doesn't work with RPCS3's resolution scaling setting. It's not really an "issue" since resolution scaling is technically a hack. But there was some work being done on trying to resolve that.

"So I can apply a patch to disable MLAA in GoW 3 then the resolution scaling will work ? like this game :
https://wiki.rpcs3.net/index.php?title=Help:Game_Patches#The_Last_of_Us

In general
Any explanation How these patches are created ? where to look ? where to start digging , any links please ?

How I can see PPU Hashes from a game ? it's something like overriding values at specific PPU hash (address) for making changes (patches) for certain things like FPS and blurring , MLAA , ... etc in a game , right ?

Thanks"

Anyone ?