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2020-10-01 06:03:14 <tzh> i'd _like_ to be able to send in some 'render' event into the frp network 60 times a second or w/e based on some external timer, but right now since i'm not running render events in the event network itself the code is kind of a mess since i have to have a separate timing loop with some synchronizing variables
2020-10-01 06:03:17 <tzh> and it's kind of a mess
2020-10-01 06:03:39 <hololeap> what are you using frp for?
2020-10-01 06:03:57 <tzh> handling inputs mostly
2020-10-01 06:04:29 <tzh> those are getting pushed into the network and turned into updates to a game info mvar kinda type, which in turn is read by the rendering loop
2020-10-01 06:04:43 <tzh> which is not exactly how frp is intended to be used as i understand it :V
2020-10-01 06:04:45 Xnuk- is now known as Xnuk
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2020-10-01 06:10:58 <hololeap> tzh: i wouldn't have frp doing much other than controlling some kind of state using user input, and have it on its own thread apart from most of the gpipe stuff. you can use MVar, TMVar, etc. to communicate between the threads.
2020-10-01 06:13:00 <tzh> hololeap: the problem i'm having with that is that my timesteps are getting messed up. if i poll the time outside of the event network, its values are actually 'back in time' compared to values happening 'at the same time' within the event network, presumably due to some differences between logical vs. actual time
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2020-10-01 06:13:42 <tzh> which leads to things like animations being messed up because the time given to a frame being render happens 'before' the time stored in the data structure
2020-10-01 06:14:28 <tzh> so i'd have to, like, poll the time 60fps or something and fire that into the event network anyway, or something like that, to get a monotonic time value that's also up-to-date for each frame
2020-10-01 06:16:03 × jb55 quits (~jb55@gateway/tor-sasl/jb55) (Ping timeout: 240 seconds)
2020-10-01 06:16:31 <hololeap> yes, that is what you should do
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2020-10-01 06:16:59 <hololeap> fire the event on each frame
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2020-10-01 06:18:34 <tzh> yeah i guess that makes sense. still requires some restructuring of the game logic but probably not as much as totally rewriting the render/frp interface
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2020-10-01 06:22:16 <hololeap> maybe take a look at
2020-10-01 06:22:17 <hololeap> https://github.com/Twey/gloss-banana/blob/master/Graphics/Gloss/Interface/FRP/ReactiveBanana.hs
2020-10-01 06:22:42 <hololeap> it uses gloss, which simplifies the rendering quite a bit, but you might get some clues from there
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2020-10-01 06:24:01 <tzh> yeah i'll take a look
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2020-10-01 06:25:26 <tzh> it's actually been a while since i touched this part of my code so i was just idly thinking for solutions, but when i get back to digging into the rendering+timing guts this looks like it'll help
2020-10-01 06:26:25 <tzh> it looks like gloss provides a callback for tick handling, and so this just hooks that up into sending time messages into the network?
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2020-10-01 06:28:27 <tzh> so i guess i'd just have to run my own timing loop based on some target-fps value and use that to push 'canonical' times into the event network, and then have the rendering loop render and pause, or something. although i guess that still has the timing issue, since to know how long or if the rendering loop should wait it would need to poll time from outside of the event network
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2020-10-01 06:30:01 <hololeap> i've seen how this is done with gloss. it has a playIO function which takes a (s -> IO Picture) which it internally runs every frame
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2020-10-01 06:31:12 <tzh> right, but how does it determine internally when it's time to render a new frame?
2020-10-01 06:31:30 <tzh> or is the answer just "any time has passed"
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2020-10-01 06:33:35 <hololeap> is there some way with gpipe to create a function that calls an IO action, which produces the output, on every frame?
2020-10-01 06:34:29 <hololeap> because this can be the `Behavior Picture` equivalent that your network produces
2020-10-01 06:35:02 <tzh> i mean, gpipe is only a rendering library; if i want something to happen every frame i have to make that happen myself. like, i have a function that does the draw calls and swaps the buffers, that kind of thing, it's just the question of how to give that a time value that's meaningful in the context of the current game data
2020-10-01 06:35:40 <hololeap> i see
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2020-10-01 06:38:06 <hololeap> i think you would need to set up the timer seperately, which would poll the frp network and render the frame on every tick
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2020-10-01 06:40:01 <tzh> yeah i'll probably have to think about this more while actually working on my timing code
2020-10-01 06:40:12 <tzh> but i have a few more ideas now at least so that's been helpful
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2020-10-01 06:40:51 <hololeap> you can also ask on #reflex-frp. they may have some general ideas even though you're using reactive-banana
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2020-10-01 06:41:58 <hololeap> and look at the gloss codebase too, since it uses gl internally
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2020-10-01 06:47:39 <tzh> yeah
2020-10-01 06:47:53 <tzh> in the mean time, it's late so i should get to bed. ty for the help!
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2020-10-01 06:49:59 <hololeap> np
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