The Implementation of Rewind in Braid 

He did? What is it?

@@tech6hutch I don't know if he published it, but he made a simple program that just displays text on the screen and lets you flip through it, and he said "Now it's better than powerpoint!"

@@Elavid oh lmao

@@Elavid what do you mean by flipping through it? i don't understand the difference

Yea, but Office 2007 in the release year, it was the most aesthetic GUI I've ever used. No other software made similarly strong positive feelings in me.

Like duh. Why would you discard frames by frame saving? The only thing that seems difficult to me is to rewind audio (maybe just play a reversed sound and cut it by your needs)

@@joepeters8746 frame by frame saving is easy if you don’t worry about memory management. And that’s exactly what makes it complicated.

@@joepeters8746 Frame by frame saving would take an insane amount of memory without forward planning and serious optimizations. This is essentially the equivalent of brute-forcing the rewind problem. The fact that he managed to do so for an infinite rewind system without crashing everyone's computers is really impressive (I'd certainly consider it difficult). Rewinding audio is much easier as you could record, compress, and play back the game's sound using pre-built systems. Also, lets not forget that in this case it was a simple platformer with few moving elements - if you wanted to do this for a more complex game with a lot of information, this approach would probably not work for you.

@@jeangodecoster if you browse prebuilt gaming PCs, 32gb is not uncommon. Anything below 16 and you have to start explaining you don't mean VRAM. 40mb is extremely frugal. With entry level nvme latency < 100us, you could probably ignore ram and stream gigabytes to disk.

Saving the whole world's state frame by frame at face value seems like the naive (ie. stupid) solution. I think every programmer would try to solve it a different way at first. Also it's not because it was the best solution for Braid that it is the best solution for you. Jon had to do some serious compression trickery to be able to use it.

If only we could rewind!

trolololol

he needed the ring!

come on pablo they've, got a convention to run and a lot more people would be messed up by them allowing people to go over their designated times, it's his fault for not timing his presentation properly.

@@fisheatsyourhead the thing is they should have schedule more time for him. Most GDC talks last at least one hour and they gave the man 30 minutes to explain a system with a lot of technicality. But you know, it was 2010, fuck indie devs right?

@@GuilhermeNeubaner "When I submitted this talk I was like 'Oh sure it's pretty simple. I'll be able to talk about everything in 25 minutes.'... Doesn't seem to be how it is." - Jonathan Blow 0:13

@@Michael_800 *sarcasm*

no, cut off because they day has a bunch of parallel tracks with simultaneous interesting talks going on, so they have to keep things on schedule.

Actually it was right before lunch, and I was specifically given that slot in order to be able to go over time, but the CAs (conference associates) were being total jerks. I also wasn't given time beforehand to make sure my laptop was set up and working with the display. You can't see it in this video, but one reason I keep hitting escape and going into PowerPoint edit mode is because people can't see the whole slides, because they were being displayed at 16:9 aspect ratio on a 4:3 screen and there wasn't time to detect this issue and fix it. (I guess whatever recording they made of the feed has the whole slides). It was a pretty terrible experience, and as a result I do not give speeches at the GDC any more!

+Jonathan Blow I appreciate you responding. I was understanding of them if you were on any other time slot, but being given the one right before lunch so that people actually could choose to stay with you overtime... I'm sorry you had to deal with that. Not to mention all the technical issues you were already dealing with...

Hi. It's a shame the talk could not be finished - it is always a pleasure to listen to your takls and interviews. Even tech-heavy ones, despite I'm not a programmer.

That was super interesting to understrand your thought process in this very technical feat. I'm a begginer at programming and game making and even though I didn't understand every technical detail, I feel like you've helped me understand a thought process path I should take. Even though your experience with GDC left you bitter, I hope you do come back because we the audience, are all interested in what you have to say. I feel really bummed we couldn't go through the last 6 slides or your presentation. Thanks for your talk!

One did simply cut Jonathan off. Unreal.

Because other talks are scheduled for that room. They should have put him in a 1 hour block instead of this 25 minute block. But he also said in the talk at the beginning that he told them a 25 minute slot was fine. So in the end this is on him, sadly.

Yeah, it was a worthwhile rewind. :)

I see what you did there.

rewind effect

file

Sound and picture are out of sync.

This? number-none.com/product/Arithmetic%20Coding,%20Part%202/index.html

Michael Campagnaro thanks :)

What do you mean? That's a perfectly cromulent word. It embiggens the title and you can't misunderstimate it.

why not doing it online in first place?

All the money got spent building the time machine to go back to 1980 and get the microphones.

Because it's not you paying :D

I watch a lot of music/audio and game talks, there is a noticeable difference in priorities.

If I understood correctly, what he meant by a diff was not that he did delta encoding (as he explicitly said he didn't). He seems to just skip entities/properties that has not changed between a frame and its base frame. But for things that has changed, he stores the full new value.

Ok, I can see how that would work with key-value pairs or with some form of diff format that encodes the position of the changes in a serialized binary blob but ... yeah, like I said, it would've been worth saying like three more sentences here to make it explicit what went on IMHO.

Penny Lane Yeah, I agree. He probably glossed over it for a lack of time. As someone else said, this needed to be a 1 hour talk at least.

Yes, totally agree!

Apparently he was told he could spill into the lunch break I think.

Because its the biggest PC platform for games.

***** Nope, win 7 & 10 dominate the field with 70% market share, then comes win xp and 8 (then Linux, then OSX). Win XP is not supported anymore, you should under no cicumstances stay with it, unless you want to be extremely vounorable to viruses etc. also I think most XP users are either old grannies or companies who were unable to make the switch yet - both of them are not exactly the target audience of video games

Merthalophor Oops, I didn't see XP at the end. I thought you are one of the hipsters who only use Linux for everything.

***** well, to be honest, I _am_ one of these guys, but I understand people who use windows.

You realize this talk was given in 2010 right?

Kelda Hanson the capability to write programs does not imply the capability to use other programs.

To quote Joanathan Blow himself: "You can't see it in this video, but one reason I keep hitting escape and going into PowerPoint edit mode is because people can't see the whole slides, because they were being displayed at 16:9 aspect ratio on a 4:3 screen and there wasn't time to detect this issue and fix it. (I guess whatever recording they made of the feed has the whole slides)." This is in a long list of issues with how the GDC handled his talk. It was a pretty terrible experience for him.

Do it yourself and prove him wrong. Oh, true, taking is easy and free, working is not

didn't he just talk about that

you're conflating cheating and bugs/exploits. one is absolutely the programmer's concern, while the other, although related, may not be.

Games hard

What's wrong with conversating about implementating? :P

Yeah I don't know why he's complainting. And they haven't changed it in two years, so I guess he'll just have to acceptate it.