WIP: Initial basic replay recording

[unknownbrackets]

This is not about TAS, I'm not a TAS person. For me it's more about rewind and issue repro (even locally, when some game misbehaves and a state would cement bugs.)

This doesn't have any UI or file format handling yet, and there's no integration with rewind yet either.

-[Unknown]

[hrydgard]

This is very cool. Took me sec to understand what all the file stuff is about, but it's for replay playbacks to function even when games were reading from disc during the recording by storing the data that was read.

[unknownbrackets]

Yeah, otherwise you get in a weird place with games that do autosaves or etc. - you can't replay the same data. This way should make it transparent to the game that the save data has changed.

Haven't totally figured out UI at this point.

For rewind, I'm thinking it can at least take snapshots less often (it will cause "scrubbing" to do this though.)

I've also realized that rewind is processed at the beginning of a frame (rather than end.) I've been considering tying it into timing because sometimes we have less expensive frames and I'd rather take the rewind snapshot then if possible.

-[Unknown]

[unknownbrackets]

Just a note: because of #11019 this will probably be reverted. I'm not interested enough in this functionality to chase some obscure virus scanner or whatever might be causing the issue, so this will probably be abandoned.

-[Unknown]

[hrydgard]

Actually I'm not sure I want to revert... If it's that hard to reproduce, and in a game that already doesn't work very well, I say meh, let's keep it.