<FromGitter>
<j8r> with only one macro, I was totaly mad this day
<FromGitter>
<j8r> a recursive macro that calls itself
<FromGitter>
<bew> Fun :P
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<jeromegn>
RX14: got some help from somebody who knows v8 a lot: "v8 doesn't have a way to signal that a longjmp has occurred.. you have to reach into internal v8 thread-local structures and trick it into thinking that each fiber is actually a thread. node-fibers does this by reseting v8's 3 TLS keys on every context switch. See the `v8::internal` stuff in this file:
<jeromegn>
https://github.com/laverdet/node-fibers/blob/master/src/coroutine.cc . When looking at this source file you can assume `USE_V8_SYMBOLS` is true, and that `CORO_PTHREAD` and `CORO_FIBER` are false/undefined. It's a horrifying approach and definitely not for the faint of heart."
<jeromegn>
"I'm not super familiar with goroutines but some initial research seems to indicate that they are built on top of threads, though with manual scheduling and careful pooling. In this case since each goroutine is actually backed by a real thread then all you need is proper Locker & Unlocker usage. On the other hand I can definitely verify that Crystal is using a setjmp/longjmp equivalent so in this case you would need to
<jeromegn>
port my horrifying hack."
<jeromegn>
maybe I can use channels to always run some functions from the same fiber
<FromGitter>
<girng> im trying to implement a callback system for my .send, that only gets executed, when the server acknowledges (replies back) that the message was sent
<FromGitter>
<girng> but only when i pass in a third parameter (which means i'm asking for the callback), so on user-request basis. not all the time
<FromGitter>
<girng> You may be wondering why I'm trying to do this. It's because when I tell a player on the master server, that they need to go to a game instance server (across the world, maybe). I need to get a reply back from the game instance server acknowledge they received the *transfer key*, instead before telling them to transfer. ⏎ ⏎ Or, maybe, `.send` could just return "true/false" if the message was fully sent and
<FromGitter>
<girng> @Blacksmoke16 very cool. the problem is however, after doing ` socket.write_bytes(new_message.bytesize) socket.send new_message`, i need to somehow yield, before continuing the execution. because i need to wait for a reply from server to acknowledge they got it. if that makes sense
<FromGitter>
<girng> because after .send is called, it's not 100% certain the receiving end acknowledged they got the msg AFAIK, it just sends the data off
<FromGitter>
<Blacksmoke16> yea i never used socket stuff, how would you *know* they got the message?
<FromGitter>
<Blacksmoke16> or is that what the issue is here?
<FromGitter>
<girng> because right after i do .send to the game instance server, i also do `.send` right after, to the client to tell them they need to connect to that game instance server. that means, if there was lag in the FIRST .send, it could possibly mean the user is connecting to the game instance before the master server message got there
<FromGitter>
<girng> hard to explain, sorry i made a graph and bew said i need to just acknowledge that they received the message
<FromGitter>
<fridgerator> @girng I don't know if that's a feature of socket communication ?
<FromGitter>
<Blacksmoke16> yea sorry bit above my level
<FromGitter>
<Blacksmoke16> never used sockets :/
<FromGitter>
<girng> @Blacksmoke16 your example is kinda exactly what i asked though, i like it...iand will use it, once i can yield for a `received` message after .send. inline callback like that would be great..
<FromGitter>
<girng> quick q: when it's blocking, does that mean the execution doesn't continue until the message was fully sent, or does it just send it off, and continue execution?
<FromGitter>
<fridgerator> what do you mean by fully sent ?
<FromGitter>
<fridgerator> There is not response from the client that the message was received
<FromGitter>
<fridgerator> It sends it, then execution continues after that
<FromGitter>
<girng> ok yeah
<FromGitter>
<girng> thank you just making sure
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<FromGitter>
<bararchy> @girng what lang are you using in Godot? C# or GDScript?
<FromGitter>
<bararchy> I'm thinking of moving from SFML to Godot for my game
<FromGitter>
<bararchy> @faustinoaq This is the rename functionality ?
<FromGitter>
<faustinoaq> @bararchy yep
<FromGitter>
<bararchy> cool!
<FromGitter>
<bararchy> nice work
<FromGitter>
<bararchy> @girng the good thing about SFML is that I can work with it using Crystal, the bad thing is it seems to lack support for some very basic stuff
<FromGitter>
<girng> @bararchy your game is 2d,correct?
<FromGitter>
<bararchy> I really enjoy working with SFML, but then I got to a place where I need stuff like playing a video, or lightning effects etc.. and you there is no support at all for that
<FromGitter>
<girng> @bararchy does SMFL have a particle system plugin or something perhaps?
<FromGitter>
<girng> Godot recently overhauled their particle system to be GPU bound instead of CPU bound, performance has been awesome
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<FromGitter>
<bararchy> @girng It seems SFML is not really a game engine and more a big framework to do multimedia stuff, so anything else needs to be added.
<FromGitter>
<bararchy> I think I'll move to Godot, even though it means using a wierd scripting languge
<FromGitter>
<bararchy> lol
<FromGitter>
<girng> @bararchy I think you'll like it. And worse case scenario you can always go back ahaha
<FromGitter>
<bararchy> I might ping you regarding stuff :)
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<FromGitter>
<girng> @bararchy sure we can pm through gitter too. more than happy to help fellow crystal friend
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<FromGitter>
<bararchy> You know what @girng I think I'll try playing with SDL2 before going to Godot, it seems more comprehensive and support more stuff while not forcing me away from Crystal, because I only need 2d Godot might be an overkill
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<FromGitter>
<girng> Go for it =]
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<txdv>
no, crystal for it
<FromGitter>
<bew> :P
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<pn-max>
Hello
<pn-max>
I'm curious, is there no number type for YAML values ?
<FromGitter>
<girng> im just gonna use redis on the master server. nn to resolve tcp messages from game servers, they'll just all connect to the main redis and use redis.get/set. much easier
<FromGitter>
<girng> gg girng, ty for playing
<pn-max>
bc right now, if you have a yaml with for instance test: 2, you can't get the value from it using parse. At least I can't. the only way I've found to get the number is to modiy the yaml to be " test: "2" " and then parse, and then as_s.to_s.to_i which is... weird
<FromGitter>
<girng> inside pingponger def, i use `redis.pong` in a loop, every 1 second. i even have a `rescue` in my pingponger method
<FromGitter>
<girng> the rescue is not catching either one
<FromGitter>
<girng> ok nvm. looks like it does catch it. had the rescue outside of the loop `end`, but after the def's `end` :P FALSE ALERT! sorry
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<oprypin>
bararchy, SFML and SDL have very similar feature sets. they are not game engines and don't claim to be. they are more about bringing the gap between different underlying hardware and software
<FromGitter>
<girng> `System.hostname` is returning `DESKTOP-FBJM7B1`
<FromGitter>
<sam0x17> crystal's `Random` is automatically seeded yes?
<FromGitter>
<girng> How can I get the local ip of the server?
<crystal-gh>
[crystal] kostya opened pull request #6082: JSON::Serializable (master...json_attributes) https://git.io/vpiFZ
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<FromGitter>
<girng> when i say server, i mean the server the crystal app is running on, not like a TCPServer connection
<FromGitter>
<sam0x17> also is there a way to get the "epsilon" value for Float64 e.g. 0.00000000000000000000001 or whatever it is. I see constants for min and max infinity etc. Visual Basic / C# has this constant and calls it float.Epsilon
<FromGitter>
<girng> ok n i think i found it, i do \` hostname -i \`
<FromGitter>
<bararchy> oprypin TBH what I really need is the SDL_gfx module, currently SFML does not allow you to draw a shape using only points as in Polygons are not really supported
<FromGitter>
<bararchy> also it seems Steam is shipping the SDL pre-built lib bundled with it's installation package which allows you to publish the game without needed the user to install SFML beforehand, also, another plus is that SDL is written in C, which means a bridge lib is not needed (Voidsfml
<FromGitter>
<bararchy> but, plus for SFML is the awsome documentation, which is really lacking in SDL, also oprypin what you did for tutorial in crSFML made it super easy for begginers
<oprypin>
bararchy, polygons are fully supported, what you said is false
<oprypin>
shipping the games on Steam or otherwise is not a problem
<FromGitter>
<niiru97_twitter> instance methods are in `self.method` name right?
<FromGitter>
<hmans> @niiru97_twitter `self` in that case denotes the receiver of the method, and that receiver would be the class itself. Hence `self.foo` is a method `foo` on your class.
<FromGitter>
<hmans> The code of such a method runs in the context of the class, not the instance, so if you call another method from within it, it would also need to be a class method.
<FromGitter>
<hmans> @niiru97_twitter Yes, that will work.
<FromGitter>
<hmans> Methods without the `self.` prefix are instance methods, ie. they will live on instances created through `Foo.new`.
<FromGitter>
<sam0x17> I just implemented bilinear interpolation image resizing if anyone needs it -- will probably eventually submit as a PR to stumpy_png
<oprypin>
sam0x17, based on the project's architecture, maybe it would have to be a separate plugin for stumpycore
<FromGitter>
<sam0x17> maybe, or its own library, I have a bunch of image functions implemented
<FromGitter>
<bararchy> oprypin oh no, how can I do collusion detection for a ConvexShape? global_boundries gives me a rectangle while my shape can be any shape
<FromGitter>
<bararchy> So, I create a line between my player_position, and the starting_position which I know will never be inside a "collision area"
<FromGitter>
<bararchy> then, I need to check if my line intersects exactly 1 edge of my poligon
<FromGitter>
<bararchy> if it does it's inside the boundries and I get collision
<FromGitter>
<bararchy> else it's outside of it
<FromGitter>
<bararchy> oprypin does that makes sense to you? :)
<pn-max>
hey..
<pn-max>
does anyone know about the yaml numbers ? is there anyway to parse them without having to put them into braces, without having to create a mapping ?
<pn-max>
into quotation marks, sorry, tired.
<FromGitter>
<bew> Yes, don't use YAML.mapping :P
<FromGitter>
<alfrednerstu> Hi, I'm getting some encoding errors when typing scandinavian characters (ÅÄÖ) in my ECR file, I'm using Kemal. Anyone have any idea how to fix? Code editor is set to UTF-8, long time since I had problems with encoding…
<FromGitter>
<bararchy> @alfrednerstu what errors excatly?
<FromGitter>
<alfrednerstu> Ö renders as ö, … renders as …, – renders as – for example
<FromGitter>
<alfrednerstu> @bararchy
<pn-max>
bew, what Im saying is
<pn-max>
I havent found a way to use YAML.parse and actually get back numbers from a yaml file
<pn-max>
if I dont input them like so : num: "1"
<pn-max>
in the yaml itself.
<badeball>
bararchy: odd number of intersections, not simply 1
<FromGitter>
<bararchy> I think when talking ConvexShape you can't have 3
<badeball>
ah, I see
<FromGitter>
<bararchy> in Concave shape you can though :)
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<FromGitter>
<gdotdesign> @alfrednerstu do you have `charset` meta tag set in the HTML to `utf-8`?
<FromGitter>
<bararchy> badeball but I still can't figure how I test if the lines intersect :\
<FromGitter>
<bew> as a temporary solution you could parse the numbers as strings, and convert (`.to_i`) after parsing
<FromGitter>
<ryankshah> If I have a method which takes a splat, i.e. `*example` which is a splat of `Proc`s - how can I use `@` with it to reference it throughout my class?
<FromGitter>
<ryankshah> Or is this not possible?
<pn-max>
bew that's what I'm doing now
<pn-max>
but it doesnt work if the numbers are as if
<pn-max>
you have to 'make' them strings by putting double quotes
<pn-max>
else you get a typecast error
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<pn-max>
yeah I'm using your solution instead
<pn-max>
and just doing a trick so that 100 becomes the code for A
<pn-max>
thanks =)
<pn-max>
much nicer than a mapping imo
<pn-max>
lol, no need
<pn-max>
works with 00.
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<oprypin>
pn-max, don't use key codes, use strings, it's much nicer!
<zorp>
hi, I want to cross-compile crystal for openbsd, is there any documentation on how to do that?
<FromGitter>
<j8r> @zorp create a port?
<zorp>
there is no port for crystal and to compile it you have to use a crystal compiler, right? so I have to cross compile from a system with a working compiler
<FromGitter>
<j8r> That's right
<FromGitter>
<j8r> You'll need the same libraries versions though
<FromGitter>
<ryankshah> Are there any hash functions i could implement which map a string to an integer?
<FromGitter>
<bararchy> Zorp, isn't that a balabit product? XD
<zorp>
hmm there is a binary release for openbsd 6.0. but only one and it's crystal 0.19.4 :/
<zorp>
also current openbsd is 6.3
<zorp>
wmoxam, maybe you know more about this? :)
<FromGitter>
<j8r> that's better Zorp
<FromGitter>
<j8r> you can compile incrementally, 0.19.4 => 0.20.0 => 0.21.0
<FromGitter>
<j8r> etc
<zorp>
I found a port :)
<zorp>
thank you for your time tho, j8r!
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<jeromegn>
anybody good with fibers? I figured out my issue and now everything works well. I had to expose the current fiber's stack_bottom address so I could set a sensible value with v8. basically, you can give v8 isolates (the vm) a stack limit address. I figured I'd give the stack a limit like the stack_bottom of the fiber.
<jeromegn>
except I had to subtract about a 1MB from the stack bottom to make it work. else i was getting a v8::internal StackOverflow error :thinking:
<jeromegn>
not looking for a specific answer, mostly some info about fibers.
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<FromGitter>
<bararchy> What does #6082 actually do?
<FromGitter>
<ryankshah> I'm trying to change the name of my module for my shard because I want it to be all lowercase but it starts with a capital
<FromGitter>
<ryankshah> Are modules in Crystal meant to start with a cap?
<FromGitter>
<bararchy> @ryankshah yeha
<FromGitter>
<ryankshah> ahh
<FromGitter>
<ryankshah> Cheers @bararchy
<FromGitter>
<bararchy> np
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<FromGitter>
<bararchy> lol math power didnt help me
<FromGitter>
<bararchy> :(
<FromGitter>
<bararchy> It still shows collision wrong
<FromGitter>
<bararchy> also it sometimes crash with "DivizionByZero"
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<FromGitter>
<bararchy> OMG I made the math work!
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<FromGitter>
<gdotdesign> 🎉
<FromGitter>
<j8r> @barachy `t >=0 && t <= 1` == `0 <= t <= 1`
<FromGitter>
<j8r> Looks like complicated calculations :o
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<FromGitter>
<ParadoxZero> Hi, I am not sure if this is the right place to ask the question. Please forgive me if it is not. ⏎ ⏎ I just came across the project in GitHub, so I did not have any time to go through the docs. Just a quick question because I am extremely curious, how is static type checking implemented if the language uses dynamic type binding (was mentioned in the readme) ? In one of the examples in docs, the type
<FromGitter>
... of a variable was changed by the assignment operation.
<crystal-gh>
[crystal] asterite pushed 2 new commits to master: https://git.io/vpPae
<FromGitter>
<j8r> @ParadoxZero Everything is statically typed. The good part is the compiler, when the types aren't specified, it can guess what types we meant
<FromGitter>
<ryankshah> How could I go about porting cpp code to crystal?
<FromGitter>
<j8r> By doing code, lol. You can also create bindings if you don't want to port
<FromGitter>
<ryankshah> I mean binding x_x I used the wrong term hehe
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<FromGitter>
<ryankshah> I've started writing a port but it may end up being easier to just write a binding
<oprypin>
ParadoxZero, instead of "type of the variable was changed" you can think of it as forgetting the old variable and creating a new one with the same name
<oprypin>
the type system is amazing, you can just read the docs, they're concise
<oprypin>
types of variables (e.g. instance variables) definitely dont change
<jeromegn>
@j8r I think you can do C++ by using an `extern "C"` block. At least that's what I'm doing. However I can't tell if it's going to work well on other people's machines. I'm going to setup CI soon to test on various arch too.
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<FromGitter>
<bararchy> @ryankshah what are you binding?
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<FromGitter>
<bararchy> oprypin SFML 2.5.0 is out in Arch
<FromGitter>
<j8r> Why have you not splitted each/some classes in files?
<oprypin>
at this point this code is only meant for me and i like it in one file so whatever
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<jeromegn>
alright, so my v8 bindings work pretty well. since v8 doesn't like fibers much, I have to set a different stack limit on every context switch.
<jeromegn>
right now, I'm exposing the @stack_top from the current Fiber to C and adding some padding to it. Hoping it won't overlap
<jeromegn>
Unfortunately that bombs rapidly with a StackOverflow error from v8. What works though is subtracting the same padding from stack_top.
<jeromegn>
but then I'm afraid the stacks will overflow from somewhere else
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<jeromegn>
any tips would be appreciated :)
<jeromegn>
oh, using @stack instead of @stack_top works.