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IRC log for #minetest-dev, 2017-06-26

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All times shown according to UTC.

Time Nick Message
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03:26 ThomasMonroe i gtg to bed, cya tomorrow
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03:32 paramat will re-merge #6026 in a few mins as is now approved by sfan5
03:32 ShadowBot https://github.com/minetest/minetest/issues/6026 -- Ores: Make 'absheight' flag non-functional by paramat
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03:39 paramat merging
03:42 paramat done
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04:26 Natechip If im needed talk to my mobile when its here.
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06:36 burli Hi
06:37 burli Is it correct that Minetest currently uses UDP for network communication?
06:39 VanessaE yes mostly
06:39 VanessaE TCP is used for some stuff, like the cURL code that fetches media from a http server
06:39 VanessaE an*
06:39 VanessaE but in-game it's all UDP
06:39 burli Hm, so UDP and TCP is mixed?
06:40 VanessaE UDP and TCP during sign-in, and pretty much UDP-only while playing
06:40 burli I learned right now that it is not a good idea to mix both in the same app
06:40 VanessaE it's fine in this case.
06:40 burli ah, ok
06:42 burli found a nice article about that http://gafferongames.com/networkin​g-for-game-programmers/udp-vs-tcp/
06:42 nerzhul UDP is used everywhere except media downloading & server list which use TCP/HTTP
06:42 burli The problem is that since TCP and UDP are both built on top of IP, the underlying packets sent by each protocol will affect each other. Exactly how they affect each other is quite complicated and relates to how TCP performs reliability and flow control, but fundamentally you should remember that TCP tends to induce packet loss in UDP packets
06:43 nerzhul burli, yes it was especially right in 56k, with modern bandwidth this problem disappear
06:43 VanessaE nerzhul: one exception to that btw
06:43 nerzhul you have same problem if you listen stream music on youtube when playing MT
06:43 VanessaE http used in-game if you have a mod installed that uses that feature.
06:47 burli However. Was just curious. As far as I remember there is a bottleneck in networking.
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08:43 sfan5 burli: like nerzh​ul already said this is not a problem at all on modern connections
08:44 sfan5 also tcp is only used during sign-in and the amount of traffic used by mt (on the client) isn't enough to fill up all bandwidth anyway
08:45 sfan5 the exception VanessaE mentioned only applies to the server, which should be running on a good connection anyway
08:45 VanessaE right.
08:45 sfan5 i don't know from which year that article you linked it but if my connection started dropping packets just because i have some tcp connection under mild load i'd call my isp to complain
08:51 jomat The oldest comments are from 2008 :-)
08:52 burli That's what I want to say right now
08:52 burli So it's not that old I think
08:56 jomat No, Internet wasn't that bad back then :-) It's just the architecure of udp that allows packets beeing dropped...
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14:38 red-001 can someone review #5965?
14:38 ShadowBot https://github.com/minetest/minetest/issues/5965 -- Create a filesystem abstraction layer for CSM and only allow accessing files that are scanned into it. by red-001
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17:59 nerzhul merging #6041 in ~5 mins
18:00 ShadowBot https://github.com/minetest/minetest/issues/6041 -- Isolate irrlicht references and use a singleton by nerzhul
18:00 nerzhul (if GH permits it, else doing it manually)
18:04 nerzhul oops merged the wrong PR, forcepush to solve that
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18:05 lisac nerzhul, No need this PR is also nice
18:05 lisac :P
18:05 nerzhul oh seems we only need to rename one function for Krock
18:05 nerzhul will push the fix, it's better
18:05 nerzhul ok Krock if i push the fix ? gh doesn't show the kilbith branch fix and doesn't merged it too
18:06 Krock yes, LGTM
18:07 nerzhul okay doing that, i compile it locally and if okay push it with kilbith name
18:07 kilbith nah, no need
18:07 kilbith I mean for the name
18:07 nerzhul okay
18:09 Krock nerzhul, uhm.. wrong commit?
18:09 nerzhul Krock, ?
18:09 Krock whatever, this trivial function name change can be omitted
18:09 nerzhul i would merge 6041 and i merged 6050
18:09 nerzhul too late :p
18:10 nerzhul thanks kilbith for that feature, i think players will like it :)
18:11 nerzhul then now merging 6041
18:11 kilbith I expect $500 from the community now
18:11 nerzhul thanks Krock for your time
18:11 nerzhul kilbith, sorry no github bounty
18:12 kilbith $1500 if you want the god rays and deferred rendering
18:12 nerzhul i think it's a lgtm price in private software, it's 2 days of senior dev development
18:12 nerzhul then it's not very expensive :p
18:13 Krock $1337 for a kingdom
18:15 red-001 https://www.openhub.net/p/m​inetest-c55/estimated_cost
18:18 nerzhul wow :p
18:20 Krock heh, Linux: $ 287,679,508
18:21 red-001 #6054
18:21 ShadowBot https://github.com/minetest/minetest/issues/6054 -- Hand isn't visible with arm inertia enabled.
18:21 kilbith nerzhul has the same issue afaik
18:21 kilbith *had
18:22 kilbith you set the setting to true in-game?
18:23 kilbith nevermind
18:23 red-001 no, it was enabled when starting the game
18:23 red-001 disabling it fixes the issue
18:23 nerzhul red-001, same pb, i have removed my cmake-build-debug and rebuild
18:23 kilbith are you compiling in debug mode?
18:23 nerzhul i don't understand why i have that problem
18:23 nerzhul but cleanup your cmake env and rebuild fix the problem
18:24 Krock did a release build and it worked alright
18:24 kilbith it shouldn't cause that even without cleaning cmake
18:24 nerzhul debug and release works
18:24 nerzhul kilbith, agreed
18:24 red-001 huh
18:25 kilbith it's the compiler doing some things in your back when using fabsf or std::fabs
18:27 kilbith at least it's my theory
18:27 kilbith does your CPU supports SSE/AVX?
18:28 red-001 I think so let me check
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18:31 red-001 SSE4.1/4.2, AVX 2.0
18:31 kilbith right
18:32 sfan5 does gcc even generate avx instructions by default?
18:32 sofar with the right -march yes
18:32 sfan5 by default
18:32 sofar depends on the distro default gcc flags, most of the times
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18:35 nerzhul oh sofar hi
18:35 nerzhul in debug mode march is not defined
18:35 nerzhul for me only cleaning up cmake build dir fix the problem, and i got it on two machines, home + work
18:35 nerzhul very strange
18:36 nerzhul (one is AMD FX 8350 and the other core i3)
18:36 red-001 testing it on a freshly cloned copy of the repo
18:36 nerzhul red-001, you don't need to clone
18:36 kilbith add this flag if necessary: -march=native
18:36 nerzhul just remove your cmake build dir
18:36 nerzhul (i hope you have a specific cmake dir and don't use source tree :p
18:37 red-001 alright it worked now
18:37 kilbith very strange
18:38 nerzhul yeah, nothing in cmake config changed between builds it's very strange
18:40 red-001 huh this looks a lot nicer in person then in the example video
18:41 kilbith yeah, I agree
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18:43 jcalve I have the arm disappearing bug too in a debug build, freshly cloned
18:43 red-001 huh
18:44 * red-001 smells undefined behavior
18:45 kilbith well I don't see how
18:46 nerzhul sounds like a underfined variable init ?
18:46 nerzhul oh
18:46 nerzhul bool m_arm_inertia; is not inited
18:46 nerzhul but yes inited in constructor
18:46 nerzhul no sense
18:47 red-001 some werid bug in incremental linking?
18:49 nerzhul seems jcalve said he has the bug on fresh build
18:49 jcalve I do
18:50 jcalve I cleaned the folder and I'm rebuilding to see if it goes away
18:58 jcalve still there
19:09 nerzhul i can reproduce it and i know where it is
19:09 nerzhul i found where is the problem
19:09 nerzhul there is division per zero
19:12 nerzhul if i forbid 0.0 division bug disappear
19:17 bigfoot547 I'm compiling new minetest! I'm excited! :D
19:25 kilbith red-001: #6055
19:25 ShadowBot https://github.com/minetest/minetest/issues/6055 -- Camera: Fix possible division per zero by kilbith
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19:33 bigfoot547 bigfoot547> Ehm, compiling minetest is giving me a linking error
19:33 bigfoot547 <bigfoot547> I'll get the paste
19:33 bigfoot547 <bigfoot547> https://pastebin.com/6pHgqd4b
19:33 bigfoot547 <bigfoot547> There's the error
19:33 bigfoot547 (#minetest )
19:36 jcalve without knowing anything about c++, looks like your json lib has a problem
19:37 bigfoot547 Yeeees
19:37 bigfoot547 Look: Linking CXX static library libjsoncpp.a
19:37 bigfoot547 It compiled
19:37 bigfoot547 Then, [ 12%] Built target jsoncpp
19:38 bigfoot547 But, the linker said stuff :(
19:38 sfan5 are you linking to system jsoncpp?
19:38 bigfoot547 Also, .text+0x3cfe is assembly stuff
19:39 bigfoot547 sfan5: How do you mean?
19:39 sfan5 do you have -DENABLE_SYSTEM_JSONCPP=TRUE
19:39 bigfoot547 No
19:40 bigfoot547 I'm building with it now
19:51 Fixer compiled newest mt just fine via msys2/mingw64
19:52 bigfoot547 I'm having problems with jsoncpp
19:55 bigfoot547 I'm installing libjsoncpp-dev'
19:55 bigfoot547 I'm installing `libjsoncpp-dev'
19:56 bigfoot547 How do I use the system jsoncpp?
19:56 sfan5 -DENABLE_SYSTEM_JSONCPP=TRUE
19:57 bigfoot547 Ok, I'm using that flag
19:57 bigfoot547 Let's just wait for the comp
20:06 Shara dra :P
20:09 bigfoot547 It works! Thank you sfan5, Fixer, jcalve, and Shara!
20:09 bigfoot547 :D
20:09 bigfoot547 Credit where credit is due ;)
20:11 nerzhul no problem i'm here :p
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20:57 Shara old sneak*
20:58 Shara Eww, wrong tab sorry
21:10 nerzhul jcalve, are you there ,
21:10 jcalve nerzhul: yes
21:10 nerzhul can you edit camera.cpp L199 to 203 to replace the two fabs with
21:10 nerzhul https://pastebin.com/MRBAMNzv
21:11 nerzhul and tell me if it works (for me okay)
21:11 jcalve sure
21:12 nerzhul red-001, ^
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21:13 jcalve nerzhul: that fixed it for me too
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21:19 nerzhul jcalve, nice
21:19 nerzhul red-001, ?
21:19 nerzhul okay pushing he fix to master
21:19 red-001 sorry I was afk
21:19 red-001 testing now
21:19 nerzhul pj
21:19 nerzhul nice i'm preparing the patch
21:23 nerzhul red-001, waiting you
21:25 red-001 yeah that worked
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21:31 nerzhul nice
21:31 nerzhul pushing the fix
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21:31 nerzhul + optim reinit += operation
21:32 red-001 any idea why it worked in release builds?
21:32 nerzhul i don't have idea
21:34 nerzhul i don't know why compiler let division by zero, if i remember i crash programs genrally
21:34 nerzhul it's not an exception in C++ hmmm
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21:35 red-001 * red-001 smells undefined behavior
21:35 nerzhul red-001, yes
21:35 red-001 I guess it optimized out the crash
21:35 nerzhul https://stackoverflow.com/questions/3004​095/division-by-zero-undefined-behavior-​or-implementation-defined-in-c-and-or-c
21:35 kilbith well, that was a good lesson
21:35 nerzhul no crash, just undefined behaviour as it seems
21:36 nerzhul whenever you do a division ensure you never have zero, if you have, handle
21:40 red-001 at least it's not JS
21:41 red-001 which seems to think it's infinaty
21:41 red-001 infinity*
21:42 nerzhul :p
21:44 red-001 huh
21:44 red-001 I should check if it returns negative infinite when dividing a negative number
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22:09 nerzhul sfan5, when you get time can you review #5963 ? i'm waiting for your approval to merge, it looks nice but i need your expertise :p
22:09 nerzhul i should go
22:09 ShadowBot https://github.com/minetest/minetest/issues/5963 -- Fix msvc annoyances by adrido
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