March 13, 2019 
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https://znc.in)[14:35:03] *** Karyon <Karyon!~Karyon@unaffiliated/karyon> has joined ##OpenGL[14:35:34] *** ville <ville!~ville@212-149-214-47.bb.dnainternet.fi> has joined ##OpenGL[14:36:51] *** esrse <esrse!~nil@175.126.171.165> has quit IRC (Ping timeout: 252 seconds)[14:46:17] *** Danol <Danol!~Danol@ip-94-112-108-12.net.upcbroadband.cz> has joined ##OpenGL[14:46:27] <Danol> Hello[14:47:05] <Danol> I'm suffering from edges not fitting correctly, sometimes leaving transparent pixels: https://ibb.co/hc9NYnj[14:47:15] <Danol> (those light pixels in the middle)[14:47:22] <Danol> Any ideas what to look for/what to do?[14:47:28] *** CoolerZ <CoolerZ!~coolerext@14.139.38.193> has quit IRC (Ping timeout: 246 seconds)[14:48:07] <Danol> https://ibb.co/85T1zQG it also happens a lot with MSAA enabled on the vertical edges[14:48:21] *** CoolerZ <CoolerZ!~coolerext@202.3.77.168> has joined ##OpenGL[14:48:24] <Danol> I tried calculating the matrices in double precision on the CPU side, did not help[14:50:12] *** learningc <learningc!~learningc@2001:d08:d6:12ab:a14f:dbe3:b38f:ec3d> has quit IRC (Read error: Connection reset by peer)[14:53:58] <Stragus> To avoid any gap between triangles, you want the same vertex coordinates, the same matrix and the same vertex shader[14:55:50] <Danol> For the vertical lines, that is held[14:56:29] *** Twipply <Twipply!~Twipply@unaffiliated/twipply> has joined ##OpenGL[14:56:42] <Danol> For the horizontal gaps, will try[15:04:58] <Danol> Hmm nah :/[15:05:16] <Danol> Everything has the same matrix and shader and still[15:05:23] <Danol> the coordinates are passed as integers[15:05:40] <Danol> well not in the shader, but are sent to the GPU as integers[15:05:46] <Danol> in 0..255 range[15:06:40] *** davr0s <davr0s!~textual@host109-150-28-226.range109-150.btcentralplus.com> has quit IRC (Quit: My MacBook Pro has gone to sleep. ZZZzzz…)[15:13:13] *** gareppa <gareppa!~gareppa@unaffiliated/gareppa> has quit IRC (Quit: Leaving)[15:18:31] *** hnsz <hnsz!~hnsz@s5594260d.adsl.online.nl> has joined ##OpenGL[15:21:06] <Stragus> Danol: Are you sure you are using the same vertex attribute values and the same matrix?[15:23:30] <Danol> Stragus, this is the code I use: https://pastebin.com/JEskHCxP[15:23:45] <Danol> where rec.offset is integer[15:23:47] *** zeduckmaster <zeduckmaster!~zeduckmas@85.106.1.181> has quit IRC (Quit: Leaving)[15:24:31] <Danol> I can see the stitching even inside the rendered chunks that are rendered by the same glDrawArrays[15:24:53] *** charlie5 <charlie5!~rod@pa49-180-71-41.pa.nsw.optusnet.com.au> has quit IRC (Ping timeout: 252 seconds)[15:25:45] *** maxtothemax <maxtothemax!~maxtothem@2601:1c2:600:445b::f7f9> has quit IRC (Ping timeout: 252 seconds)[15:25:54] <Stragus> That offset is not guaranteeing the same output for calculations[15:26:28] <Stragus> If any offset math was done with integers before conversion to floats, I guess that would work in practice. Although maybe not strictly guaranteed[15:28:12] <Danol> as I said, the stitching is visible even in the regions rendered using the same glDrawArrays where the offset is uniform[15:28:56] *** charlie5 <charlie5!~rod@pa49-180-71-41.pa.nsw.optusnet.com.au> has joined ##OpenGL[15:30:59] <Stragus> That would be pretty weird. Are you using the same vertices? Or different vertices with all identical vertex attributes for the ones that contribute to computing gl_Position?[15:31:33] <Danol> I'm quite positive it's the same vertices[15:32:08] <Danol> I've discovered that when I turn of my postprocessing, it goes away[15:32:20] <Danol> so I might have some bugs in the postprocessing[15:32:35] <Stragus> Right. Otherwise it should have been impossible[15:46:25] *** learningc <learningc!~learningc@2001:d08:d6:12ab:808c:da69:5849:22fd> has joined ##OpenGL[15:48:48] <Danol> https://ibb.co/Nt1r8MZ ok what about this?[15:49:05] <Danol> I'm getting a different part of the texture when a face is heavily skewed[15:49:19] <Danol> filtering is set to nearest[15:49:34] <Danol> The grass seems to be getting to texture of the lamp[15:50:06] <Danol> https://ibb.co/gVkSMkf the atlas looks like this[15:51:05] <Stragus> Not sure what to look at, you get a border of 1 pixel from the neighbor image of your atlas?[15:51:07] <Danol> Every face has a margin repeating the around the face (the face is ther erepeated)[15:51:20] <Danol> the border is actually equal to the sife of the image[15:51:44] <Danol> On the game screenshot, you can see those weird yellow-black lines in the center of the image[15:51:56] <Danol> there should be grass texture there[15:51:59] <Stragus> Do you have anisotropic filtering enabled?[15:52:02] <Danol> no[15:52:29] <Danol> and even if so, the lamp texture is on the right in the atlas[15:52:31] <Stragus> Do your texcoords end up in the middle of the corner pixels of each image, or at the corners of each image?[15:52:44] <Danol> corners I believe[15:52:48] <Danol> but still, there's plenty of margin[15:52:51] <Stragus> In the second case, float math can make you land in the next image[16:05:26] <Danol> There's the big margin[16:05:38] <Danol> and also the fact that the lamp texture is on the right of the grass texture, not under it[16:09:22] *** gareppa <gareppa!~gareppa@unaffiliated/gareppa> has joined ##OpenGL[16:11:37] <Danol> There seems to be problem on the uv coordinates level[16:12:07] <Danol> https://ibb.co/VmjynPQ[16:12:16] <Danol> I'm not texturing anything, just showing the UV coordinates[16:12:32] <Danol> there shouldn't be those places with yellow color. How does that happen?[16:17:12] *** groton <groton!~groton@unaffiliated/groton> has joined ##OpenGL[16:32:08] *** thomas_25 <thomas_25!~thomas_25@unaffiliated/thomas-25/x-0068438> has quit IRC (Ping timeout: 245 seconds)[16:33:15] *** groton <groton!~groton@unaffiliated/groton> has quit IRC (Quit: groton)[16:35:40] *** CoolerZ <CoolerZ!~coolerext@202.3.77.168> has quit IRC (Ping timeout: 250 seconds)[16:43:40] *** upgrdman <upgrdman!~upgrdman@blender/artist/upgrdman> has joined ##OpenGL[16:55:38] *** Foaly <Foaly!~Foaly@ppp-88-217-90-191.dynamic.mnet-online.de> has joined ##OpenGL[16:55:59] *** stefkos <stefkos!~Pawel@79.184.214.190.ipv4.supernova.orange.pl> has quit IRC (Quit: Going offline, see ya! 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Even to a smaller resolution?[21:31:13] *** slime73 <slime73!~slime73@blk-215-81-93.eastlink.ca> has joined ##OpenGL[21:32:13] <Foaly> glviewport shouldn't be expensive[21:34:00] <qptain_Nemo> hmm, reducing the resolution seems to help for some reason[21:37:02] *** slvn_ <slvn_!~slvn_@c2s31-1-78-245-90-111.fbx.proxad.net> has quit IRC (Remote host closed the connection)[21:39:37] *** iderik <iderik!~weechat@h-162-65.A147.priv.bahnhof.se> has quit IRC (Quit: iderik)[21:39:59] *** bayoubengal <bayoubengal!~bayoubeng@rrcs-50-84-94-202.sw.biz.rr.com> has quit IRC (Ping timeout: 252 seconds)[21:41:05] *** bayoubengal <bayoubengal!~bayoubeng@rrcs-50-84-94-202.sw.biz.rr.com> has joined ##OpenGL[21:43:39] <qptain_Nemo> oh hm i guess it could be the switch of render target[21:46:02] <qptain_Nemo> i guess my situation is more complicated than i thought[21:52:50] *** davr0s <davr0s!~textual@host109-150-28-226.range109-150.btcentralplus.com> has quit IRC (Quit: My MacBook Pro has gone to sleep. ZZZzzz…)[22:00:40] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has quit IRC (Quit: Leaving.)[22:00:59] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has joined ##OpenGL[22:01:27] <Yaniel> it is most likely the switch of render target causing other changes in your pipeline[22:01:38] <Yaniel> possibly relinking of shader[22:05:02] <qptain_Nemo> that can happen?[22:05:21] <Yaniel> yes[22:06:08] <Yaniel> modern drivers do stuff like blending in the shader AFAIK[22:08:36] *** petris_ is now known as petris[22:09:02] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has quit IRC (Quit: Leaving.)[22:09:22] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has joined ##OpenGL[22:17:30] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has quit IRC (Quit: Leaving.)[22:17:49] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has joined ##OpenGL[22:23:39] *** halbeno_ <halbeno_!~halbeno@d50-93-37-115.abhsia.telus.net> has joined ##OpenGL[22:26:54] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has quit IRC (Ping timeout: 246 seconds)[22:29:17] *** davr0s <davr0s!~textual@host109-150-28-226.range109-150.btcentralplus.com> has joined ##OpenGL[22:31:55] *** Foaly <Foaly!~Foaly@ppp-88-217-90-191.dynamic.mnet-online.de> has quit IRC (Quit: Now 'mid shadows deep falls blessed sleep.)[22:32:05] *** halbeno_ <halbeno_!~halbeno@d50-93-37-115.abhsia.telus.net> has quit IRC (Quit: Leaving.)[22:32:24] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has joined ##OpenGL[22:51:20] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has quit IRC (Quit: Leaving.)[22:51:42] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has joined ##OpenGL[22:51:46] *** thomas_25 <thomas_25!~thomas_25@unaffiliated/thomas-25/x-0068438> has quit IRC (Quit: My MacBook has gone to sleep. ZZZzzz…)[22:53:27] *** davr0s <davr0s!~textual@host109-150-28-226.range109-150.btcentralplus.com> has quit IRC (Quit: My MacBook Pro has gone to sleep. ZZZzzz…)[22:54:00] *** davr0s <davr0s!~textual@host109-150-28-226.range109-150.btcentralplus.com> has joined ##OpenGL[22:55:21] *** upgrdman <upgrdman!~upgrdman@blender/artist/upgrdman> has quit IRC (Quit: Leaving)[23:04:33] *** groton <groton!~groton@unaffiliated/groton> has joined ##OpenGL[23:06:26] <qptain_Nemo> do you actually need to insert explicit glMemoryBarrier calls between rendering to a texture and then reading from it in another shader?[23:06:35] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has quit IRC (Quit: Leaving.)[23:06:54] *** halbeno <halbeno!~halbeno@d50-93-37-115.abhsia.telus.net> has joined ##OpenGL[23:10:28] <Yaniel> no[23:11:09] <Yaniel> at least if you don't have the texture bound at the time when you use it in a shader[23:11:19] <Serus> In OpenGL ES 2 are you supposed to call glEnableVertexAttribArray every time before drawing?[23:11:28] <Yaniel> if you want to read and write to the texture at the same time thennnn it gets more complicated[23:11:54] <Yaniel> Serus: it's global state so not necessary unless the set of enabled attributes changes[23:12:33] <Serus> Does that very between objects drawn? Or is on a per buffer basis?[23:12:47] <qptain_Nemo> Yaniel: well if it's always bound as the output of a framebuffer but then another shader only just samples from it[23:13:30] <Yaniel> does the other shader draw to the same framebuffer?[23:13:35] <qptain_Nemo> no[23:14:32] <Yaniel> so texture is attached to FBO a and written to, then another shader samples the texture and writes to FBO b which has different textures attached?[23:14:42] <qptain_Nemo> yes[23:14:43] <Yaniel> that's fine, no need for any manual synchronization[23:14:48] <qptain_Nemo> ok thanks[23:23:37] *** krystcich <krystcich!~krystcich@088156132084.dynamic-ww-04.vectranet.pl> has quit IRC (Quit: Going offline, see ya! (www.adiirc.com))[23:24:07] *** d3x0r <d3x0r!~d3x0r@ip174-72-226-164.lv.lv.cox.net> has joined ##OpenGL[23:32:43] *** glYoda <glYoda!~MTLYoda@c-73-25-27-206.hsd1.or.comcast.net> has quit IRC (Quit: glYoda)[23:44:18] *** s0laster <s0laster!~needs@119.160.9.93.rev.sfr.net> has quit IRC (Remote host closed the connection)[23:48:46] *** davr0s <davr0s!~textual@host109-150-28-226.range109-150.btcentralplus.com> has quit IRC (Quit: My MacBook Pro has gone to sleep. ZZZzzz…)[23:51:12] *** davr0s <davr0s!~textual@host109-150-28-226.range109-150.btcentralplus.com> has joined ##OpenGL[23:53:12] <Serus> glVertexAttribPointer uses the currently bound array buffer, right?[23:53:37] <Serus> an element buffer would not change its behavior, right?[23:59:53] <derhass> right