March 4, 2019 
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March 4, 2019 [00:16:16] *** karab44 <karab44!~karab44@unaffiliated/karab44> has joined ##OpenGL[00:49:49] *** BPL <BPL!~BPL@102.56.27.77.dynamic.reverse-mundo-r.com> has quit IRC (Quit: Leaving)[01:00:10] *** atk <atk!~Arch-TK@ircpuzzles/staff/Arch-TK> has quit IRC (Quit: Well this is unexpected.)[01:00:32] *** atk <atk!~Arch-TK@ircpuzzles/staff/Arch-TK> has joined ##OpenGL[01:04:02] *** serg-z <serg-z!~serg-z@87.247.25.10> has quit IRC (Ping timeout: 244 seconds)[01:05:24] *** soul-d <soul-d!~name@2a02:a44a:bcae:1:b14b:978b:e66b:d20c> has quit IRC (Ping timeout: 258 seconds)[01:10:22] *** serg-z <serg-z!~serg-z@37.99.59.189> has joined ##OpenGL[01:12:41] *** ratchetfreak <ratchetfreak!~ratchetfr@ptr-82s3g7mshmuppe4qf4b.18120a2.ip6.access.telenet.be> has quit IRC (Ping timeout: 258 seconds)[01:16:25] *** davr0s <davr0s!~textual@host109-152-21-236.range109-152.btcentralplus.com> has joined ##OpenGL[01:25:59] *** davr0s <davr0s!~textual@host109-152-21-236.range109-152.btcentralplus.com> has quit IRC (Quit: My MacBook Pro has gone to sleep. 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<learningc!~learningc@mti-37-145.tm.net.my> has quit IRC (Ping timeout: 255 seconds)[12:48:32] *** grim001 <grim001!~grim001@ip70-189-228-129.lv.lv.cox.net> has joined ##OpenGL[12:49:04] <mort> hey, if I have two quads on the screen, how does opengl determine which gets drawn on top of the other?[12:54:19] <karalaine> mort: https://paroj.github.io/gltut/Positioning/Tut05%20Overlap%20and%20Depth%20Buffering.html[12:55:55] <mort> thanks[12:56:46] *** HZun <HZun!~HZun@0x3ec721e2.osd.customer.dk.telia.net> has joined ##OpenGL[13:01:44] *** slime <slime!~slime73@blk-215-81-93.eastlink.ca> has joined ##OpenGL[13:22:54] *** learningc <learningc!~learningc@mti-37-145.tm.net.my> has joined ##OpenGL[13:23:53] *** User__ <User__!~learningc@mti-37-145.tm.net.my> has quit IRC (Ping timeout: 255 seconds)[13:24:46] *** slime <slime!~slime73@blk-215-81-93.eastlink.ca> has quit IRC (Quit: This computer has gone to sleep)[13:35:39] *** porky11 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<tcsc!sid721@gateway/web/mozilla/x-lcglbqyhponugfot> has joined ##OpenGL[15:15:34] *** Stragus <Stragus!~alexis@modemcable198.134-161-184.mc.videotron.ca> has joined ##OpenGL[15:17:23] *** bigpet <bigpet!uid25664@gateway/web/irccloud.com/x-gmkawmresoftjfup> has joined ##OpenGL[15:49:40] *** hellozee <hellozee!~hellozee@116.73.34.190> has joined ##OpenGL[15:52:44] *** HZun <HZun!~HZun@0x3ec721e2.osd.customer.dk.telia.net> has quit IRC (Quit: Leaving)[16:02:57] *** Nicmavr <Nicmavr!~Nicmavr@unaffiliated/nicmavr> has quit IRC (Read error: Connection reset by peer)[16:05:02] *** Nicmavr <Nicmavr!~Nicmavr@unaffiliated/nicmavr> has joined ##OpenGL[17:16:49] *** BobBarker <BobBarker!~null@2607:5300:60:1c3f::> has joined ##OpenGL[17:30:32] *** upgrdman <upgrdman!~upgrdman@blender/artist/upgrdman> has joined ##OpenGL[17:48:10] *** Matthijs <Matthijs!~quassel@unaffiliated/matthijs> has quit IRC (Quit: *waves frantically*)[17:57:26] *** Foaly <Foaly!~Foaly@ppp-88-217-88-122.dynamic.mnet-online.de> has joined ##OpenGL[18:10:14] *** gareppa <gareppa!~gareppa@unaffiliated/gareppa> has joined ##OpenGL[18:12:38] *** iderik <iderik!~weechat@h-162-65.A147.priv.bahnhof.se> has quit IRC (Quit: iderik)[18:19:23] *** gareppa <gareppa!~gareppa@unaffiliated/gareppa> has quit IRC (Quit: Leaving)[18:20:08] <zy]x[yz> hmm. say i'm drawing a whole bunch of the same model: i'd populate the vertex buffer, then for each object i'd populate a transform uniform and then call glDrawArrays(), right? alternately, i could repeat the vertex buffer data for many objects, and then have another input (not uniform) for the transoform matrices, and draw several of them with one call to glDrawArrays(). is there a better way to[18:20:14] <zy]x[yz> batch them than that?[18:22:03] <Stragus> How big is that model you are repeating?[18:22:12] *** karab44 <karab44!~karab44@unaffiliated/karab44> has quit IRC ()[18:22:25] <Stragus> Instances could be appropriate, or indirect multi draw, or manual instancing...[18:22:35] <zy]x[yz> this is just a thought experiment at the moment as i think about how to proceed[18:23:20] <Stragus> Well, it's different if said model is a quad particle, a strand of grass, or a comfy chair[18:24:12] <zy]x[yz> for this discussion let's say it's a very simple model, like a quad billboard[18:25:01] <Stragus> Then you would do manual instancing by fetching all the data in the vertex shader, only given gl_VertexID[18:26:25] <Stragus> For more complex models, you would use regular instancing, glVertexAttribDivisor()[18:27:25] <zy]x[yz> cool, i'll go read up on that stuff. thanks[18:36:39] *** ratchetfreak <ratchetfreak!c351a8d8@gateway/web/freenode/ip.195.81.168.216> has quit IRC (Ping timeout: 256 seconds)[18:59:17] *** Foaly <Foaly!~Foaly@ppp-88-217-88-122.dynamic.mnet-online.de> has quit IRC (Quit: Now 'mid shadows deep falls blessed sleep.)[19:04:12] *** swebb <swebb!~swebb@161.97.198.243> has quit IRC (Remote host closed the connection)[19:06:05] *** swebb <swebb!~swebb@161.97.198.243> has joined ##OpenGL[19:14:40] *** ratchetfreak <ratchetfreak!~ratchetfr@ptr-82s3g7mshmuppe4qf4b.18120a2.ip6.access.telenet.be> has joined ##OpenGL[19:40:15] *** jfpoole <jfpoole!~textual@72.143.113.107> has joined ##OpenGL[19:56:54] *** Noah1101 <Noah1101!~noah@c-73-216-58-112.hsd1.va.comcast.net> has joined ##OpenGL[19:58:51] *** hellozee <hellozee!~hellozee@116.73.34.190> has quit IRC (Remote host closed the connection)[19:59:09] *** quadsar <quadsar!~quadsar@unaffiliated/quadsar> has quit IRC (Ping timeout: 244 seconds)[20:00:38] *** quadsar <quadsar!~quadsar@unaffiliated/quadsar> has joined ##OpenGL[20:26:40] *** groton <groton!~groton@unaffiliated/groton> has joined ##OpenGL[20:41:32] *** Twipply <Twipply!~Twipply@unaffiliated/twipply> has joined ##OpenGL[20:45:17] *** slidercrank <slidercrank!~slidercra@ircpuzzles/2015/april-fools/fifth/slidercrank> has joined ##OpenGL[20:46:06] *** BobBarker 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Bye!)[21:39:26] *** jfpoole <jfpoole!~textual@72.143.113.107> has quit IRC (Quit: Textual IRC Client: www.textualapp.com)[22:02:08] *** Noah1101 <Noah1101!~noah@c-73-216-58-112.hsd1.va.comcast.net> has quit IRC (Ping timeout: 245 seconds)[22:03:30] *** slvn_ <slvn_!~slvn_@c2s31-1-78-245-90-111.fbx.proxad.net> has quit IRC (Quit: Leaving)[22:23:44] *** glYoda <glYoda!~MTLYoda@c-73-25-27-206.hsd1.or.comcast.net> has quit IRC (Quit: glYoda)[22:26:11] *** RobertPlummer <RobertPlummer!49928d92@gateway/web/freenode/ip.73.146.141.146> has joined ##OpenGL[22:27:43] <RobertPlummer> Hi guys! I'm running Khronos unit tests on headless-gl for the additions of rendering multiple targets, and I'm getting a unique situation: there is a gl.readPixels call that checks what is output from the fragment shader, and it returns all zeros.[22:28:13] <RobertPlummer> In an effort to find the issue, I wrote a utility to listens to the context, and picks up all methods called, and is able to replay the whole thing.[22:28:50] <RobertPlummer> Inside the Khronos tests fail, but if I put the listening in the tests, picking up all commands called to the gl context, and then I replay them: it acts as desired.[22:29:26] <RobertPlummer> So my question: What could cause readpixels to be all zero's, if both environments are nearly identical?[22:30:03] *** ShadowIce <ShadowIce!~pyoro@unaffiliated/shadowice-x841044> has quit IRC (Quit: Leaving)[22:32:02] <RobertPlummer> What is very odd is that the fragment shader returns an if statement, it should be either a red background or a green one. But inside the unit test, I'm getting all zeros.[22:32:06] <RobertPlummer> In other words, no colors.[22:34:20] <RobertPlummer> Ah, ha! I think I may have part of it. the extension isn't being called.[22:35:20] *** slime <slime!~slime73@24.215.81.93> has joined ##OpenGL[22:35:32] *** RobertPlummer <RobertPlummer!49928d92@gateway/web/freenode/ip.73.146.141.146> has quit IRC (Quit: Page closed)[22:52:39] *** Nokurn <Nokurn!~Nokurn@71-95-52-160.dhcp.rvsd.ca.charter.com> has quit IRC (Quit: ZNC 1.7.2 - https://znc.in)[22:52:46] *** Smjert_ <Smjert_!~Smjert@unaffiliated/smjert> has quit IRC (Quit: ZNC 1.6.1 - http://znc.in)[22:52:56] *** Nokurn <Nokurn!~Nokurn@71-95-52-160.dhcp.rvsd.ca.charter.com> has joined ##OpenGL[22:53:00] *** Smjert <Smjert!~Smjert@unaffiliated/smjert> has joined ##OpenGL[22:54:03] *** gaulishcoin <gaulishcoin!~gaulishco@anice-652-1-19-72.w83-201.abo.wanadoo.fr> has quit IRC (Remote host closed the connection)[22:54:26] *** R2robot <R2robot!~R2robot@unaffiliated/r2ro> has quit IRC (Ping timeout: 272 seconds)[22:54:26] *** bpmedley <bpmedley!~bpm@c-69-94-201-19.hs.gigamonster.net> has quit IRC (Ping timeout: 272 seconds)[22:55:32] *** gareppa <gareppa!~gareppa@unaffiliated/gareppa> has joined ##OpenGL[22:55:38] *** bpmedley <bpmedley!~bpm@c-69-94-201-19.hs.gigamonster.net> has joined ##OpenGL[23:03:16] *** R2robot <R2robot!~R2robot@unaffiliated/r2ro> has joined ##OpenGL[23:05:22] *** stefkos <stefkos!~Pawel@79.184.52.47.ipv4.supernova.orange.pl> has quit IRC (Remote host closed the connection)[23:11:46] *** gareppa <gareppa!~gareppa@unaffiliated/gareppa> has quit IRC (Quit: Leaving)[23:14:27] *** bayoubengal01 <bayoubengal01!~bayoubeng@rrcs-50-84-94-202.sw.biz.rr.com> has quit IRC (Ping timeout: 240 seconds)[23:36:54] *** davr0s <davr0s!~textual@host109-152-21-236.range109-152.btcentralplus.com> has quit IRC (Quit: My MacBook Pro has gone to sleep. 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