September 17, 2016 
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September 17, 2016 [00:01:59] *** tm6041 <tm6041!~tom@86.14.246.48> has joined ##OpenGL[00:02:00] *** ShadowIce <ShadowIce!~pyoro@unaffiliated/shadowice-x841044> has quit IRC (Quit: Leaving)[00:03:22] *** tm604 <tm604!~tom@pdpc/supporter/professional/tm604> has quit IRC (Disconnected by services)[00:03:26] *** tm6041 is now known as tm604[00:03:29] *** tm604 <tm604!~tom@86.14.246.48> has quit IRC (Changing host)[00:03:29] *** tm604 <tm604!~tom@pdpc/supporter/professional/tm604> has joined ##OpenGL[00:03:46] *** quickbrownfox <quickbrownfox!~henrique_@177.131.178.169> has quit IRC (Ping timeout: 255 seconds)[00:03:46] *** GarrettShields <GarrettShields!~GarrettSh@CPE3497f6605400-CMbc14013107e0.cpe.net.cable.rogers.com> has quit IRC (Ping timeout: 255 seconds)[00:11:02] *** kuldeep <kuldeep!~kuldeep@unaffiliated/kuldeepdhaka> has joined ##OpenGL[00:12:28] *** nine_milli <nine_milli!~nine_mill@32.211.52.104> has joined ##OpenGL[00:19:42] *** telex <telex!teletype@freeshell.de> has quit IRC (Ping timeout: 264 seconds)[00:23:18] *** groton <groton!~groton@unaffiliated/groton> has quit IRC (Quit: groton)[00:26:54] *** ArkaZeen <ArkaZeen!~ArkaZeen@rn-nat-129-97-131-0.dynamic.uwaterloo.ca> has quit IRC (Ping timeout: 264 seconds)[00:31:21] *** bergesenha <bergesenha!uid186066@gateway/web/irccloud.com/x-qoxizlhkfzfukgsx> has joined ##OpenGL[00:33:07] *** ibouvousaime <ibouvousaime!~ibouvousa@41.82.44.140> has quit IRC (Ping timeout: 248 seconds)[00:33:47] *** ibouvousaime <ibouvousaime!~ibouvousa@41.82.46.154> has joined ##OpenGL[00:34:21] *** cam_y <cam_y!~cam_y@162.222.103.203> has joined ##OpenGL[00:35:05] *** Xeek <Xeek!~xeek@unaffiliated/xeek> has quit IRC (Ping timeout: 272 seconds)[00:36:19] *** Xeek <Xeek!~xeek@unaffiliated/xeek> has joined ##OpenGL[00:37:55] *** carado <carado!~carado@2a01:e34:ec1e:2390:8341:b3f5:2d6:41fa> has quit IRC (Ping timeout: 248 seconds)[00:39:18] *** cam_y <cam_y!~cam_y@162.222.103.203> has quit IRC (Ping timeout: 244 seconds)[00:39:39] *** bergesenha <bergesenha!uid186066@gateway/web/irccloud.com/x-qoxizlhkfzfukgsx> has quit IRC ()[00:47:48] *** glYoda <glYoda!~MTLYoda@c-50-137-137-82.hsd1.or.comcast.net> has quit IRC (Quit: glYoda)[00:49:40] *** telex <telex!teletype@freeshell.de> has joined ##OpenGL[00:51:39] *** ImQ009 <ImQ009!~ImQ009@unaffiliated/imq009> has quit IRC (Read error: Connection reset by peer)[00:56:25] *** bjz <bjz!~bjz@104.222.140.110> has quit IRC (Quit: My MacBook Pro has gone to sleep. ZZZzzz…)[01:00:38] *** Ad1_RnR <Ad1_RnR!~Adrian@public-gprs395167.centertel.pl> has quit IRC (Ping timeout: 265 seconds)[01:02:58] *** Ad1_RnR <Ad1_RnR!~Adrian@public-gprs386663.centertel.pl> has joined ##OpenGL[01:08:56] *** GarrettShields <GarrettShields!~GarrettSh@CPE3497f6605400-CMbc14013107e0.cpe.net.cable.rogers.com> has joined ##OpenGL[01:12:43] *** Waynes <Waynes!~wayness@23.94.61.168> has quit IRC (Quit: Leaving.)[01:17:44] *** bjz <bjz!~bjz@pa49-199-192-123.pa.vic.optusnet.com.au> has joined ##OpenGL[01:22:35] *** razieliyo <razieliyo!~razieliyo@unaffiliated/razieliyo> has joined ##OpenGL[01:23:51] <btipling> what kind of error would make things appear stretched near the edges of a perspective projection?[01:24:05] <btipling> an issue with zoom?[01:24:45] *** eivarv <eivarv!~eivarv@89.11.223.65> has quit IRC (Quit: Sleep)[01:25:44] <foobaz> are you sure it's an error? things are supposed to appear stretched near the edge of a perspective projection[01:27:00] <foobaz> because the screen is not perpendicular to a ray from the viewer's eye there[01:27:15] <kmnt> perspective projection is like linear and can look goofy, if you apply a barrel distortion it would look less weird[01:28:30] *** anli_ <anli_!~anders@217-211-66-29-no23.tbcn.telia.com> has joined ##OpenGL[01:30:11] *** KAHR-Alpha <KAHR-Alpha!~Alpha@AReims-652-1-76-199.w86-192.abo.wanadoo.fr> has quit IRC (Ping timeout: 265 seconds)[01:33:00] <btipling> ah[01:35:26] *** Keniyal <Keniyal!~Keniyal@unaffiliated/keniyal> has quit IRC (Remote host closed the connection)[01:35:58] *** bjz <bjz!~bjz@pa49-199-192-123.pa.vic.optusnet.com.au> has quit IRC (Quit: My MacBook Pro has gone to sleep. ZZZzzz…)[01:38:16] <foobaz> it is a feature that it's skewed at the edge, not a bug[01:38:48] <foobaz> because the display is skewed from the perspective of the user, and the distortion introduced by perspective projection corrects for the display's orientation[01:42:14] *** ratchetfreak <ratchetfreak!~ratchetfr@ptr-2hj4tbosgukogvvgjh90kfz9a.ip6.access.telenet.be> has quit IRC (Read error: Connection reset by peer)[01:42:33] *** nikki93 <nikki93!~nikki93@2601:645:8104:cb10:7159:d49c:d04e:541a> has quit IRC (Remote host closed the connection)[01:42:38] *** ratchetfreak <ratchetfreak!~ratchetfr@ptr-2hj4tbosgukogvvgjh90kfz9a.ip6.access.telenet.be> has joined ##OpenGL[01:47:08] *** ravior <ravior!~ravior@5-13-250-133.residential.rdsnet.ro> has joined ##OpenGL[01:54:34] *** DrBenway <DrBenway!~DrBenway@190.18.153.73> has quit IRC (Remote host closed the connection)[01:58:38] *** ratchetfreak <ratchetfreak!~ratchetfr@ptr-2hj4tbosgukogvvgjh90kfz9a.ip6.access.telenet.be> has quit IRC (Ping timeout: 265 seconds)[01:59:22] *** robot-beethoven <robot-beethoven!~robot-bee@c-73-65-29-166.hsd1.mn.comcast.net> has joined ##OpenGL[01:59:22] *** nikki93 <nikki93!~nikki93@2601:645:8104:cb10:d6e:a94a:4ec7:47fb> has joined ##OpenGL[02:02:14] *** TechnoCrunch <TechnoCrunch!~Tech@101.100.137.146> has joined ##OpenGL[02:02:17] *** Vtec234 <Vtec234!~Vtec234@31.205.150.30> has quit IRC (Quit: Leaving)[02:02:29] *** p3rs3us <p3rs3us!~jduro@host86-132-103-130.range86-132.btcentralplus.com> has quit IRC (Ping timeout: 272 seconds)[02:05:29] *** arescorpio <arescorpio!~arescorpi@214-27-245-190.fibertel.com.ar> has joined ##OpenGL[02:05:44] *** Gama11 <Gama11!~quassel@pD9F901AE.dip0.t-ipconnect.de> has quit IRC (Remote host closed the connection)[02:06:29] *** BBIL_ <BBIL_!~quassel@41.225.182.158> has quit IRC (Read error: Connection reset by peer)[02:11:34] *** tristianc <tristianc!~tristianc@pool-100-36-92-89.washdc.fios.verizon.net> has joined ##OpenGL[02:14:39] *** crankslider <crankslider!~slidercra@unaffiliated/slidercrank> has quit IRC (Remote host closed the connection)[02:15:42] *** p3rs3us <p3rs3us!~jduro@86.184.148.55> has joined ##OpenGL[02:16:45] *** cam_y <cam_y!~cam_y@162.222.103.203> has joined ##OpenGL[02:17:25] *** realz <realz!~realz@unaffiliated/realazthat> has quit IRC (Ping timeout: 255 seconds)[02:17:54] *** pril <pril!~userid@unaffiliated/pril> has quit IRC (Ping timeout: 276 seconds)[02:18:43] *** slidercrank <slidercrank!~slidercra@unaffiliated/slidercrank> has joined ##OpenGL[02:19:20] *** cameronfr <cameronfr!cameronfr@2604:a880:1:20::1e5:900f> has quit IRC (Max SendQ exceeded)[02:19:46] *** cameronfr <cameronfr!cameronfr@2604:a880:1:20::1e5:900f> has joined ##OpenGL[02:22:04] *** cam_y_ <cam_y_!~cam_y@209-234-175-138.static.twtelecom.net> has joined ##OpenGL[02:24:30] *** cam_y <cam_y!~cam_y@162.222.103.203> has quit IRC (Ping timeout: 264 seconds)[02:27:19] *** flavi0 <flavi0!~anon@unaffiliated/flavi0> has quit IRC (Quit: leaving)[02:31:42] *** ibouvousaime <ibouvousaime!~ibouvousa@41.82.46.154> has quit IRC (Read error: Connection reset by peer)[02:32:15] *** ibouvousaime <ibouvousaime!~ibouvousa@41.82.46.154> has joined ##OpenGL[02:34:06] *** xxNamuxx <xxNamuxx!~xxNamexx@ppp14-2-162-215.bras1.hba2.internode.on.net> has quit IRC (Ping timeout: 264 seconds)[02:34:45] *** wolfcub <wolfcub!~henrique_@177.131.178.169> has joined ##OpenGL[02:34:55] *** stelarcf <stelarcf!~stelarcf@exenir.com> has quit IRC (Quit: stelarcf)[02:35:25] *** xxNamuxx <xxNamuxx!~xxNamexx@ppp118-208-249-85.bras1.hba2.internode.on.net> has joined ##OpenGL[02:52:45] *** pavshn <pavshn!~pavshn@ppp95-165-153-84.pppoe.spdop.ru> has quit IRC (Quit: My MacBook Air has gone to sleep. 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ZZZzzz…)[03:59:56] *** Joefish <Joefish!~Joefish@p5B12153E.dip0.t-ipconnect.de> has joined ##OpenGL[04:03:10] *** Joefish_ <Joefish_!~Joefish@p5B120D26.dip0.t-ipconnect.de> has quit IRC (Ping timeout: 255 seconds)[04:11:23] *** Birchy <Birchy!~Birchy@178-164-108.52.3p.ntebredband.no> has quit IRC (Ping timeout: 250 seconds)[04:12:30] *** joshsyn <joshsyn!~swoorup@220-253-130-5.dyn.iinet.net.au> has quit IRC (Ping timeout: 264 seconds)[04:17:38] *** notadeveloper <notadeveloper!~notadevel@107-210-170-22.lightspeed.sndgca.sbcglobal.net> has joined ##OpenGL[04:22:08] *** fqtw_ <fqtw_!~me@x4db2b1d2.dyn.telefonica.de> has joined ##OpenGL[04:25:33] *** fqtw <fqtw!~me@x590e47b6.dyn.telefonica.de> has quit IRC (Ping timeout: 240 seconds)[04:33:50] *** ArkaZeen <ArkaZeen!~ArkaZeen@rn-nat-129-97-131-0.dynamic.uwaterloo.ca> has joined ##OpenGL[04:36:22] *** nikki93 <nikki93!~nikki93@2601:645:8104:cb10:d6e:a94a:4ec7:47fb> has quit IRC (Remote host closed the connection)[04:41:51] *** nolash <nolash!~nolash@ip5f5bd522.dynamic.kabel-deutschland.de> has quit IRC (Read error: Connection reset by peer)[04:42:29] *** nolash <nolash!~nolash@ip5f5bd522.dynamic.kabel-deutschland.de> has joined ##OpenGL[04:53:38] *** SwiftMatt <SwiftMatt!~Objective@162.242.94.208> has joined ##OpenGL[04:56:33] *** joshsyn <joshsyn!~swoorup@220-253-130-5.dyn.iinet.net.au> has joined ##OpenGL[04:58:07] *** hexagoxel <hexagoxel!~hexagoxel@p4FCCD84F.dip0.t-ipconnect.de> has quit IRC (Ping timeout: 244 seconds)[04:58:21] <nine_milli> sup, can someone get me up and running on mac?[04:58:26] *** Ad1_RN <Ad1_RN!~Adrian@public-gprs386002.centertel.pl> has joined ##OpenGL[04:59:50] *** hexagoxel <hexagoxel!~hexagoxel@p200300798F119100021E33FFFE2231E9.dip0.t-ipconnect.de> has joined ##OpenGL[05:00:28] *** xaxxon <xaxxon!~xaxxon@2601:602:9d00:d58b:99a6:8004:11d9:3868> has quit IRC (Quit: This computer has gone to sleep)[05:01:29] *** Ad1_RnR <Ad1_RnR!~Adrian@public-gprs386663.centertel.pl> has quit IRC (Ping timeout: 240 seconds)[05:02:37] <nine_milli> http://pastebin.com/kqvTUqwc[05:02:42] <nine_milli> what else needs to be set up[05:02:46] *** fqtw_ is now known as fqtw[05:02:49] <nine_milli> just want glclear to work[05:03:23] *** xaxxon <xaxxon!~xaxxon@c-24-18-184-142.hsd1.wa.comcast.net> has joined ##OpenGL[05:05:05] <xaxxon> nine_milli, you still need help?[05:05:13] <nine_milli> yea[05:05:22] <xaxxon> with what specifically?[05:05:22] <nine_milli> trying to get gl setup on osx[05:05:29] <xaxxon> to develop?[05:05:38] <nine_milli> i just want to glClear to a certain color[05:06:16] <xaxxon> do you have a strong preference on what "helper library" you use? like sdl glfw3 whatever[05:06:28] <xaxxon> oh, and what language do you want to use?[05:06:35] <nine_milli> yes, i dont want to use a helper lib right now[05:06:48] <nine_milli> when angle is available on osx im gonna switch to that[05:08:09] <xaxxon> nine_milli, creating windows and such is annoying. I don't know how to do that[05:08:18] <nine_milli> thats all done[05:08:34] <xaxxon> ok, then you need to be specific about what you need help with[05:08:44] <nine_milli> i have the view etc displaying with a draw interval[05:08:56] <nine_milli> what do i need to do to initilaize opengl?[05:08:57] <dahlia> why would they put angle on osx?[05:09:07] <nine_milli> i want to froce es2 standards[05:09:10] <dahlia> doesnt it need d3d?[05:09:19] <nine_milli> no it supports many backends[05:09:28] <xaxxon> yeah, the point is it's supposed to support es2 everywhere[05:09:30] <nine_milli> look at there site there’s a status[05:09:40] <dahlia> oh[05:09:59] <xaxxon> basically it works everywhere except os x[05:10:06] <xaxxon> nine_milli, so what's your current issue?[05:10:18] <nine_milli> glclear aint working and i have no idea why[05:10:31] <nine_milli> im sure im missing some setup[05:10:31] <dahlia> what does osx use for webgl then?[05:10:46] <dahlia> or for iphone simulator?[05:10:48] <xaxxon> dahlia, "os x" doesn't do webgl[05:10:56] <dahlia> safari does[05:11:22] <kenzierocks> chrome does on osx[05:12:23] <nine_milli> check out http://angleproject.org[05:12:23] <xaxxon> dahlia, are you telling it to set the color buffer and calling swap after?[05:12:29] <xaxxon> *nine_milli[05:13:11] <nine_milli> pretty much[05:13:17] <xaxxon> why don't you post your code[05:13:22] <nine_milli> i did[05:13:30] <nine_milli> : http://pastebin.com/kqvTUqwc[05:13:37] <xaxxon> I think I was not here when you did. ok[05:14:00] <xaxxon> what happens when you run it?[05:14:08] <nine_milli> the view is just black[05:14:39] <nine_milli> im sure opengl isnt correctly setup or something[05:14:46] <nine_milli> never did desktop gl before[05:15:21] <xaxxon> nine_milli, did you grab the "graphics tools for Xcode" package? http://adcdownload.apple.com/Developer_Tools/Graphics_Tools_for_Xcode_7.2/Graphics_Tools_for_Xcode_7.2.dmg[05:15:27] <xaxxon> it has standalone tools[05:15:55] <nine_milli> i added the opengl framework if that’s what you mean?[05:16:06] <xaxxon> no[05:16:24] <xaxxon> if you run your program from the OpenGL profiler, you can set breakpoints on OpenGL errors[05:16:26] <dahlia> I have c++ code which runs on linux/windows/osx/ios/andriod/emscripten and I just basically use core profile 2 and and inject some minor glsl #defines[05:16:28] *** SwiftMatt <SwiftMatt!~Objective@162.242.94.208> has quit IRC (Quit: My MacBook Pro has gone to sleep. ZZZzzz…)[05:16:30] <xaxxon> like "break on OpenGL errors"[05:16:52] <nine_milli> let me check if there’s any console output[05:17:01] <xaxxon> probably not[05:17:26] <nine_milli> just the text drawing[05:17:33] <nine_milli> so at least i know the timer is working[05:17:55] <nine_milli> let me google for an osx example[05:20:10] <xaxxon> I highly recommend running it in the OpenGL profiler.[05:24:25] *** d4ryus <d4ryus!~d4ryus@p549899D3.dip0.t-ipconnect.de> has quit IRC (Ping timeout: 248 seconds)[05:25:57] <xaxxon> anyone using EASTL? I'm getting linker errors for operator new[][05:26:58] *** d4ryus <d4ryus!~d4ryus@p549890D3.dip0.t-ipconnect.de> has joined ##OpenGL[05:33:19] *** SHC <SHC!~quassel@45.249.249.77> has joined ##OpenGL[05:36:10] *** notadeveloper <notadeveloper!~notadevel@107-210-170-22.lightspeed.sndgca.sbcglobal.net> has quit IRC (Ping timeout: 260 seconds)[05:36:56] *** nikki93 <nikki93!~nikki93@2601:645:8104:cb10:d6e:a94a:4ec7:47fb> has joined ##OpenGL[05:41:41] *** nikki93 <nikki93!~nikki93@2601:645:8104:cb10:d6e:a94a:4ec7:47fb> has quit IRC (Ping timeout: 250 seconds)[05:42:51] *** Ad1_RN <Ad1_RN!~Adrian@public-gprs386002.centertel.pl> has quit IRC (Quit: Wychodzi z Matrixa)[05:45:42] *** SwiftMatt <SwiftMatt!~Objective@162.242.94.208> has joined ##OpenGL[05:51:31] *** d4rkforce <d4rkforce!~darkforce@pdpc/supporter/student/d4rkforce> has joined ##OpenGL[05:54:41] *** d4rkforc1 <d4rkforc1!~darkforce@pdpc/supporter/student/d4rkforce> has quit IRC (Ping timeout: 250 seconds)[05:57:30] *** MrFlibble 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<Th30n!~Th30n@78-0-208-174.adsl.net.t-com.hr> has joined ##OpenGL[14:10:53] <simias> hey folks, I have a big performance problem that I'm not sure how to work around[14:11:19] <simias> I'm writing a PSX GPU emulator in opengl and it needs to support 4 semi-transparency modes[14:11:29] <simias> which I emulate using the fixed function blending stage[14:12:00] *** phr34k <phr34k!~phpfreake@82-169-74-79.ip.telfort.nl> has quit IRC (Read error: Connection reset by peer)[14:12:35] <karalaine> whats "mode" in this context?[14:13:11] <simias> https://github.com/libretro/beetle-psx-libretro/blob/master/rustation-libretro/src/renderer/GlRenderer.cpp#L294-L319[14:13:15] <simias> those are the modes[14:13:45] <simias> unfortunately that means that I need to change the blend function and/or equation whenever the mode changes[14:14:05] *** phr34k <phr34k!~phpfreake@82-169-74-79.ip.telfort.nl> has joined ##OpenGL[14:14:09] <simias> and since semi-transparency is order-dependant I can't just buffer the draws by mode or something[14:14:15] <simias> I need to draw them back to front[14:14:31] <simias> so if a game likes to change the mode very often within a frame, I end up with hundred of draw calls[14:14:33] *** ravior <ravior!~ravior@5-13-250-133.residential.rdsnet.ro> has quit IRC (Remote host closed the connection)[14:14:37] <simias> something like this: https://cloud.githubusercontent.com/assets/7925386/18569634/1ec34de6-7ba4-11e6-87ee-648b55c8f912.png[14:15:04] <simias> where I draw a handfull of triangles in a glDrawElementBaseVertex, change the mode, draw a handfull of triangles, change the mode etc...[14:15:09] <simias> that completely ruins performance[14:15:43] <simias> the thing is, I know there are some closed source GL plugins who manage to get it to work just fine, so there's got to be a way around this[14:17:29] *** razieliyo <razieliyo!~razieliyo@unaffiliated/razieliyo> has joined ##OpenGL[14:17:34] <karalaine> at least you could call glBlendFunc only in SemiTransparencyMode_SubtractSource as it stays same otherwise[14:17:47] <karalaine> dunno if that does help at all though[14:17:57] <simias> yeah, I tried that but it didn't help[14:18:24] <simias> I can actually remove the calls to glblend* and it still crawls[14:18:40] <simias> it's the sheer number of draw calls that seems to be the issue[14:18:43] <derhass> I don't see why "hundreds of draw calls" in itself would ruin performance[14:19:14] <simias> derhass: well it's what I observe[14:19:25] *** Th30n <Th30n!~Th30n@78-0-208-174.adsl.net.t-com.hr> has quit IRC (Ping timeout: 260 seconds)[14:19:30] <derhass> yeah. but what is making them that expensive?[14:19:31] <simias> I go from ~200fps to like 60 in those situations[14:19:38] <simias> I don't know[14:19:49] <simias> I'm pretty noobish in opengl, I don't know what to look for[14:19:59] <derhass> on what kind of gpu?[14:20:17] <simias> I tried emptying the shaders to a bare minimum but it barely affects performance at all[14:20:32] <simias> R900 but other people have reported similar issues with other GPUs[14:20:37] <simias> err[14:20:39] <simias> R290[14:20:44] <grim001> profile and check if you're CPU limited. draw calls are expensive[14:20:45] <simias> or is it 280? I'm not sure anymore[14:22:12] <simias> my program only takes ~60% CPU in top so it doesn't look like I'm limited by the CPU[14:22:32] <simias> (the emulator itself probably takes close to 50% on its own)[14:22:44] <derhass> simias: if you ignore the blend mode changes, and just drew all of the transparent ones in one batch with one of the modes, would it be much faster then?[14:22:56] <simias> yes[14:23:01] <grim001> how are you determining the CPU usage?[14:23:05] <simias> grim001: top[14:23:15] *** ravior <ravior!~ravior@2a02:2f0e:c310:153a:224:d7ff:feb5:311c> has joined ##OpenGL[14:23:37] *** Malediction <Malediction!~Buggery@foritus.plus.com> has quit IRC (Read error: Connection reset by peer)[14:24:10] <grim001> so you're somehow GPU limited with empty shaders and not much geometry?[14:24:17] *** Jackneill <Jackneill!~Jackneill@unaffiliated/jackneill> has quit IRC (Ping timeout: 250 seconds)[14:24:23] <simias> don't blame the victim[14:25:16] <simias> derhass: actually I've just tried again, if I ignore the mode changes the performance roughly doubles but it's still not that great[14:25:25] <simias> I get around ~80fps which is not impressive for a PSX[14:25:44] <simias> could you recommend a good program to profile this?[14:25:50] <simias> I'm obviously missing a bottleneck[14:25:58] <simias> something that works on linux if possible...[14:27:32] *** subli <subli!~renegade@90-230-90-249-no148.tbcn.telia.com> has joined ##OpenGL[14:28:09] <simias> maybe I should just incrementally remove code until I get decent perf[14:28:36] *** Suchorski <Suchorski!regex@unaffiliated/suchorski> has joined ##OpenGL[14:29:37] *** toor <toor!~toor@76.ip-51-254-204.eu> has quit IRC (Remote host closed the connection)[14:33:43] *** Murii <Murii!~Murii@86.125.206.235> has quit IRC ()[14:34:09] *** toor <toor!~toor@eth-east-parth2-46-193-65-52.wb.wifirst.net> has joined ##OpenGL[14:35:15] *** carado <carado!~carado@2a01:e34:ec1e:2390:8341:b3f5:2d6:41fa> has quit IRC (Ping timeout: 248 seconds)[14:36:12] *** doomlord <doomlord!~textual@host86-142-61-36.range86-142.btcentralplus.com> has quit IRC (Quit: My MacBook Pro has gone to sleep. 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ZZZzzz…)[17:25:24] *** pril <pril!userid@unaffiliated/pril> has joined ##OpenGL[17:27:00] *** Ploppz <Ploppz!~ploppz@2001:700:303:b:f3ce:ca7c:3834:8e44> has quit IRC (Quit: WeeChat 1.5)[17:28:05] *** wizardtheo <wizardtheo!57720e5b@gateway/web/cgi-irc/kiwiirc.com/ip.87.114.14.91> has joined ##OpenGL[17:28:07] *** Th30n_ <Th30n_!~Th30n@93-136-64-202.adsl.net.t-com.hr> has joined ##OpenGL[17:28:25] *** ImQ009 <ImQ009!~ImQ009@unaffiliated/imq009> has joined ##OpenGL[17:29:04] *** Th30n <Th30n!~Th30n@78-0-208-174.adsl.net.t-com.hr> has quit IRC (Ping timeout: 265 seconds)[17:33:26] <wizardtheo> hi... I'm wondering about MVP matrixes... so they convert positions in model-space into clip-space OK... but is there a way to convert back from clip-space to model-space...[17:34:07] <wizardtheo> I know there's the inverse of a matrix but it's not that simple, because there's the whole "w" component thing where you need to "divide by w" to get the coordinate in clipspace[17:34:46] <wizardtheo> so if I had a coordinate in clipspace... what would be the "correct w" to multiply by first, so that I can NEXT multiply by the inverse of the MVP matrix[17:36:51] *** kasper_ <kasper_!~safaf@82.137.14.15> has quit IRC (Ping timeout: 265 seconds)[17:38:56] <wizardtheo> let's say I had an xyz coordinate in (-1 --> 1) NDC space... how do I convert that back into world-space?[17:39:19] <wizardtheo> assuming I have the typical MVP matrix setup[17:39:38] *** anli_ <anli_!~anders@217-211-66-29-no23.tbcn.telia.com> has joined ##OpenGL[17:39:50] <derhass> wizardtheo: you are just confused[17:40:08] <derhass> wizardtheo: there is no divide by w thing at all in model space <-> clip space[17:40:44] <wizardtheo> yeah sorry[17:40:56] <wizardtheo> NDC space is not equal to clip space[17:40:57] <derhass> what you wan't isn't the inverse in the strict mathematical sense[17:41:11] <derhass> if you would, you would have the w[17:41:13] <anli_> Is a perspective matrix an approximation of the reality? In my world projected coordinates should be calculated with x/z and y/z[17:41:25] <wizardtheo> right[17:41:49] <wizardtheo> derhass: is the "w" component figure-outable in any way, though? Assuming I have xyz in NDC (1 to -1) space?[17:42:08] <anli_> 1 is point, 0 is vector[17:42:10] <anli_> (for w)[17:42:19] <anli_> Maybe you knew that[17:42:42] <wizardtheo> when you convert an xyz coord from world-space to clipspace, it's w component is not 1 anymore or 0[17:42:59] <anli_> Ah, I see[17:43:06] <derhass> wizardtheo: it doesn't matter that much[17:43:08] <wizardtheo> you "divide by w" to get a coord in NDC space so that xyz are from -1 to 1 if they are "Visible"[17:43:46] <wizardtheo> im trying to start with positions in NDC space and get the world-spce coords tough[17:43:48] <wizardtheo> though*[17:43:52] <wizardtheo> so it does matter to me[17:44:14] <anli_> A perspective matrix could only magnify closer objects linearily, right? Not reciprocally[17:44:30] <derhass> wizardtheo: if you only care about unprojection some 3d point (x,y,z), all you have to do is create a clip space point (x_c, y_c, z_c, w_c) such what x_c/w_c = x, y_c/w_c = y, z_c/w_c = z[17:44:47] <derhass> the easiest way is to use w_c = 1, obviously[17:45:31] <wizardtheo> hmmm...[17:45:44] <wizardtheo> OK so let's say I had a point (1,1,1) in clipspace...[17:45:47] <derhass> this means that you apply that to some inverse projection matrix, you'll get a w =! 1 back, and have to divide again[17:46:23] <derhass> and this is why it is not the exact inverse operation (considering the 4d homogenous space), but in 3d, you will get the same end result[17:47:06] <derhass> thing is: if forward transform is MVP * x; fivide by w; the inverse would be: multiply by w; inv(MVP) * that[17:47:26] <derhass> and that would give you back exactly the w in your input space, typically 1[17:47:34] <derhass> no division needed[17:48:04] <wizardtheo> derhass i wish I spoke mathematics... i have to study each sentance real hard to understand its meaning[17:48:13] <wizardtheo> (i almost said I wish I smoke mathematics)[17:48:15] <wizardtheo> lol[17:48:52] <derhass> wizardtheo: you don't have a point (1,1,1) in clip space, because clip space is 4D[17:49:06] *** Cooler <Cooler!~CoolerExt@117.248.8.92> has quit IRC (Ping timeout: 264 seconds)[17:49:06] <wizardtheo> OK[17:49:12] <wizardtheo> well I didnt know th[17:49:13] <wizardtheo> that[17:49:33] <derhass> you were talking about w before, but didn't know it was the fourth component?[17:49:40] <wizardtheo> yes[17:49:49] <wizardtheo> isn't it relative to the fov or something?[17:49:59] <derhass> no[17:50:04] <wizardtheo> damn[17:50:50] <anli_> I cant even get an idea about how those perspective matrices can work: http://62.168.145.82/glmatrix/[17:51:54] <wizardtheo> derhass: Are you saying there is a way to collect the "w" component given existing information?[17:52:02] <wizardtheo> or that I "should know it" already somehow?[17:52:29] <wizardtheo> let's say we are talking about xyz = (1,1,1) in NDC space[17:52:47] <derhass> wizardtheo: you can't get an unique mapping between 3D and 4D points[17:53:02] <wizardtheo> ok[17:53:03] *** ArkaZeen <ArkaZeen!~ArkaZeen@rn-nat-129-97-131-0.dynamic.uwaterloo.ca> has joined ##OpenGL[17:53:14] <derhass> wizardtheo: the clip space -> NDC step reduces 4D to 3D, and information is lost[17:53:29] <wizardtheo> wierd[17:53:39] <derhass> it is actually not lost in the GL, because the GL stores the clip space w[17:54:08] <derhass> it is needed for a lot of things[17:54:16] <derhass> and it could be used for unprojection[17:54:26] <derhass> but that is only a minor detail[17:54:28] <wizardtheo> OK well let's try this... I DID write some kind of "reverse engineer" function... basically, it "Brute forces" every point near(ish) the camera, and finds a point that equals a point in NDC[17:54:51] <wizardtheo> so let's sy I wanted a point (1,1,1) in NDC after MVP multiplication... it can find it[17:54:56] *** sedeki <sedeki!~textual@unaffiliated/sedeki> has quit IRC (Quit: Textual IRC Client: www.textualapp.com)[17:54:58] <wizardtheo> only thing it's horribly slow, as you can expect[17:55:01] <wizardtheo> :)[17:55:04] <derhass> well[17:55:11] *** Th30n_ <Th30n_!~Th30n@93-136-64-202.adsl.net.t-com.hr> has quit IRC (Ping timeout: 244 seconds)[17:55:15] *** indefini <indefini!~chris@240d:1a:1ca:ac00:3602:86ff:fe47:864b> has quit IRC (Ping timeout: 248 seconds)[17:55:24] <wizardtheo> I just want the same thing, but with maths :([17:55:31] <derhass> (1,1,1) is the top right back corner of the frustum[17:55:48] <derhass> wizardtheo: your normal unprojection will do it for you[17:56:12] <wizardtheo> if I multiply (1,1,1,1) by inverse(MVP)[17:56:19] <wizardtheo> I don't get the correct worldpsace position[17:56:25] <wizardtheo> because w is wrong[17:56:32] <derhass> because of two things[17:56:39] <derhass> a) you forgot to divide by w[17:56:59] <derhass> b) MVP matrix is not world to clipspace, so the inverse will not bring you back to world space[17:57:24] <wizardtheo> OK sorry... let's assume my model is identity matrix[17:57:31] <wizardtheo> so it might as well be a VP matrix[17:57:52] <derhass> then we can just use the View * Projection matrix[17:57:59] <wizardtheo> it's just the "w" thats messing me up[17:58:06] <derhass> which will work in the general case, and not confuse a model transform into this[17:58:14] <wizardtheo> ok[17:58:15] <anli_> How is a point converted to clipspace? I thought it was P * M * vec until now[17:58:16] <derhass> it is not messing up anything[17:58:36] <derhass> you are just not interpreting the 4d homogenous clip space position correctly[17:58:57] <derhass> *4d homogenous world space[17:59:04] <wizardtheo> derhass im probably not interpreting anything correctly :([17:59:54] <derhass> anli_: there are two answers to that: a) whatever you do in your vertex shader, b) typically, P * V * M[18:00:22] <anli_> What is V here?[18:00:36] <derhass> the view matrix[18:00:45] <anli_> mv matrix?[18:00:49] <derhass> no[18:00:51] <anli_> ah[18:00:59] <anli_> So the MV matrix is V * M then[18:01:06] <derhass> yes[18:01:14] <derhass> hence the name^^[18:01:18] <anli_> hehe[18:01:42] <anli_> Is M a vec4?[18:01:50] <wizardtheo> M is Mat4[18:01:57] <anli_> ok[18:02:08] <wizardtheo> P and V are Mat4[18:02:25] <anli_> So its P * V * M * pt then?[18:02:25] <wizardtheo> derhass: it's like you are trying to tell me something I should know, but I just dont get it.[18:02:48] <derhass> wizardtheo: well, what is the issue actually?[18:03:13] <derhass> wizardtheo: usie inverse(P*V) * (x,y,z,1) followed by a division by w, and you're done[18:03:17] <derhass> *use[18:03:30] <wizardtheo> Well... basically i want to do raymarching... so I need to get "world-space rays" for each pixel[18:03:48] <wizardtheo> everything I tried doesnt do it except this brute-force thing I made up[18:04:17] <wizardtheo> derhass: Im sure i tried that, but I'll try again[18:04:40] <wizardtheo> I also wanna kind of understand what Im doing[18:04:41] <wizardtheo> that helps[18:05:43] <anli_> Cool, then I know why there is a -1 in the 4,3 cells in http://62.168.145.82/glmatrix/, when you divide with the resulting w, you divide with -z[18:06:07] <derhass> anli_: sure[18:06:18] <wizardtheo> yeah I tried it again, and the coords are way off derhass...[18:06:38] <anli_> oh, wait with -5z that would be[18:06:40] <derhass> wizardtheo: then you are doing it wrong[18:06:46] <anli_> the 3,4 matrix slot[18:06:54] <derhass> anli_: your matrices are probably transposed[18:07:06] <wizardtheo> with my "brute force" algorithm, the coords I get for (1,1,1) to (-1,-1,-1) points, seem reasonable... specifically the "nearface" of my frustum is very near the camera-eye-coordinate![18:07:06] <anli_> I do not think that, must check the code[18:07:20] <anli_> should not be[18:07:27] <wizardtheo> and the far-face seems reasonable[18:07:52] <derhass> wizardtheo: I don;t know what you are doing, so I can't tell you where the error is[18:07:59] <derhass> wizardtheo: but it certainly is broken[18:08:25] <wizardtheo> I pretty much copied your code and put it in and altered it to use my naming system[18:08:46] <wizardtheo> auto Test = inverse(Proj()*View()) * vec4(1,1,1,1);[18:08:51] <wizardtheo> auto Test2 = Test / Test.w;[18:09:00] <derhass> well[18:09:06] <derhass> that makes a lot of assumptions[18:09:17] <derhass> about the conventions you might be using[18:09:35] <derhass> what are your input matrices?[18:09:40] <derhass> and what result do you get[18:09:45] <derhass> and what result do you expect?[18:10:00] <wizardtheo> I expect the nearface to be near the camera-eye, right?[18:10:18] *** kasper^ <kasper^!~safaf@82.137.13.59> has joined ##OpenGL[18:10:29] <derhass> you don't unproject a near-plane point[18:10:33] *** Th30n <Th30n!~Th30n@93-136-64-202.adsl.net.t-com.hr> has joined ##OpenGL[18:10:34] <derhass> you unproject a far-plane point[18:10:54] <wizardtheo> OK[18:11:06] <wizardtheo> I think I got it wrong[18:11:27] <derhass> and for it to be "near the camera" totally depends on how you set up your projection[18:11:27] <wizardtheo> I transformed a near-space coord and it IS near to my camera-eye[18:11:30] <wizardtheo> so it does seem working[18:11:31] <derhass> it could be miles away[18:11:36] <wizardtheo> my project is setup normally...[18:11:45] <wizardtheo> ill get the code[18:11:46] <wizardtheo> hold on[18:11:56] <anli_> Is NDC space the one before the division with w?[18:12:13] <madsy__> anli_: No, after[18:12:16] <derhass> anli_: before or after depends on which direction you're going[18:12:17] <anli_> ok[18:12:24] <anli_> yeah[18:12:33] <anli_> But lets assume we calculate screen coords[18:12:40] <derhass> as madsy said[18:12:49] <madsy__> anli_: N stands for normalized. After dividing with w, all points are between -1 and 1[18:12:51] <wizardtheo> Proj = glm::perspectiveFov( glm::radians(45.0f), (float)Width, (float)Height, 1.0f, 1000.0f );[18:13:02] <madsy__> Or 0 and 1, depending on how your clip matrix looks like[18:13:29] <wizardtheo> nothing strange about my projection...[18:13:40] *** Suchorski <Suchorski!regex@unaffiliated/suchorski> has quit IRC (Ping timeout: 255 seconds)[18:13:47] <wizardtheo> (i hope)[18:13:59] <derhass> wizardtheo: well, yes. I just noted that it will depend on your projection[18:13:59] <wizardtheo> it works as expected[18:14:13] *** Suchorski <Suchorski!regex@189-13-147-110.user.veloxzone.com.br> has joined ##OpenGL[18:14:13] *** Suchorski <Suchorski!regex@189-13-147-110.user.veloxzone.com.br> has quit IRC (Changing host)[18:14:13] *** Suchorski <Suchorski!regex@unaffiliated/suchorski> has joined ##OpenGL[18:14:24] <wizardtheo> OK anyhow, sorry derhass m answers were confusing you[18:14:26] <wizardtheo> my[18:14:39] *** SwiftMatt <SwiftMatt!~Objective@162.242.94.252> has joined ##OpenGL[18:14:41] <wizardtheo> the coordinate IS transformed to a sensible coord, if I do a nearface transform[18:14:43] *** fqtw <fqtw!~me@x4db2b1d2.dyn.telefonica.de> has quit IRC (Read error: Connection reset by peer)[18:14:46] <derhass> I get the impression that my answers were confusing you :)[18:14:55] <wizardtheo> maths confuses me[18:14:56] <wizardtheo> :)[18:15:03] <wizardtheo> at least 3D maths does[18:15:05] <derhass> wizardtheo: it is also correct if you unproject a far plane point[18:15:15] <wizardtheo> OK[18:15:20] <derhass> wizardtheo: your far plane is just 1000 units away[18:15:26] <wizardtheo> true[18:15:37] <derhass> it is also correct for any other distance inbetween[18:15:40] <derhass> and beyond[18:16:00] <derhass> it will just get weirtd if you try unorojection points behind the camera[18:16:29] <wizardtheo> sure[18:16:44] <wizardtheo> ill give it a go thanks[18:17:02] <derhass> well, the unintuitive thing anout those is that the lie just behind your far plane in NDC[18:18:38] *** z3r0_ <z3r0_!~z3r0@41.86.240.102> has joined ##OpenGL[18:18:54] <wizardtheo> the thing that confuses me really now is that the numbers dont seem anywhere near the numbers that I "Brute forced"[18:19:07] <wizardtheo> the near-face numbers do, but not the far-face numbers[18:19:10] *** Ad1 <Ad1!~Adrian@public-gprs383288.centertel.pl> has joined ##OpenGL[18:19:30] <wizardtheo> I think it could be an issue with z-flip[18:19:45] <wizardtheo> my code does a z-flip somewhere i'll try fix that[18:21:59] <derhass> I'm rather not asking...[18:22:17] <wizardtheo> sorry[18:22:27] *** kasper_ <kasper_!~safaf@82.137.15.147> has joined ##OpenGL[18:22:35] <wizardtheo> i just rather assume that +z goes out into the world ahead of me[18:22:40] <wizardtheo> and -z goes behind me[18:22:58] <wizardtheo> but my matrixes assume the opposite[18:23:29] *** kasper^ <kasper^!~safaf@82.137.13.59> has quit IRC (Ping timeout: 250 seconds)[18:23:32] <derhass> because glm follows default GL conventions[18:23:41] <wizardtheo> yes[18:24:06] <derhass> just set up your own projection matrix and you'll be fine[18:24:18] <wizardtheo> so when I do "V2 = M * V1;" I really do "V2 = M * vec3(V1.x, V1.y, -V1.z);"[18:24:43] <derhass> that's the totally wrong place to do this[18:24:57] <wizardtheo> I think it's ruining my math around camera-rays, yes[18:25:16] <wizardtheo> I should fix that first?[18:25:53] <wizardtheo> like you said, just set up my own projection matri[18:25:58] <wizardtheo> matrix*[18:27:40] <derhass> and a matching view matrix[18:28:21] <wizardtheo> OK[18:28:48] *** kasper_ <kasper_!~safaf@82.137.15.147> has quit IRC (Ping timeout: 244 seconds)[18:29:06] <wizardtheo> thanks[18:29:11] <wizardtheo> sorry for all the questions[18:29:27] <wizardtheo> im really commited to doing raymarching[18:29:33] <wizardtheo> and understanding this stuff[18:31:43] *** nolash <nolash!~nolash@ip5f5bd522.dynamic.kabel-deutschland.de> has quit IRC (Remote host closed the connection)[18:33:10] <wizardtheo> http://stackoverflow.com/questions/4124041/is-opengl-coordinate-system-left-handed-or-right-handed opengl seems a mix of right-handed and left-handed by default :/[18:33:14] <wizardtheo> doesn't help simplify things[18:33:18] *** nolash <nolash!~nolash@ip5f5bd522.dynamic.kabel-deutschland.de> has joined ##OpenGL[18:33:49] *** wizardtheo <wizardtheo!57720e5b@gateway/web/cgi-irc/kiwiirc.com/ip.87.114.14.91> has quit IRC (Quit: http://www.kiwiirc.com/ - A hand crafted IRC client)[18:35:12] *** ImQ009 <ImQ009!~ImQ009@unaffiliated/imq009> has quit IRC (Read error: Connection reset by peer)[18:35:44] *** ImQ009 <ImQ009!~ImQ009@unaffiliated/imq009> has joined ##OpenGL[18:37:37] <anli_> Hm, this is not correct: http://62.168.145.82/glmatrix/[18:37:43] <anli_> (updated link)[18:37:59] <anli_> I got a NDC coord where x: - 7[18:38:02] <anli_> approx[18:40:39] *** Codex_ <Codex_!~terop@91-157-91-164.elisa-laajakaista.fi> has quit IRC (Ping timeout: 265 seconds)[18:42:02] *** Jeanne-Kamikaze <Jeanne-Kamikaze!~Jeanne-Ka@102.red-81-43-172.staticip.rima-tde.net> has quit IRC (Ping timeout: 244 seconds)[18:42:23] <derhass> anli_: your matrices are printed transposed to standard math conventions[18:42:58] *** ratchetfreak <ratchetfreak!~ratchetfr@ptr-2hj4tbosgukogvvgjh90kfz9a.ip6.access.telenet.be> has quit IRC (Read error: Connection reset by peer)[18:43:03] <derhass> anli_: but I don't see why the x_ndc=-7 would be incorrect[18:43:24] *** ratchetfreak <ratchetfreak!~ratchetfr@ptr-2hj4tbosgukogvvgjh90kfz9a.ip6.access.telenet.be> has joined ##OpenGL[18:43:30] <anli_> Thats the midpoint of the viewport -7, right?[18:43:44] <derhass> what?[18:43:50] <derhass> no idea what you are even saking[18:43:52] <anli_> hehe[18:43:54] *** z3r0_ <z3r0_!~z3r0@41.86.240.102> has quit IRC (Quit: Leaving)[18:44:39] <anli_> The matrices is written as 0 1 2 3, the next line 4 5 6 7[18:44:40] <derhass> well[18:44:49] <derhass> your point lies behind the camera to begin with[18:45:01] <derhass> it would be clipped away, and never end in NDC[18:45:09] <anli_> 5 is between 2 and 10?[18:45:35] <derhass> 5 is between 2 and 10[18:45:37] *** BilboTheHobbit <BilboTheHobbit!~Emma@112.10.170.75> has quit IRC (Ping timeout: 255 seconds)[18:45:44] <derhass> but not between -2 and -10[18:45:45] <anli_> So its between the clipping planes[18:45:48] <anli_> Oh, wait[18:45:49] <derhass> nope[18:45:51] <anli_> lol[18:45:53] <derhass> it is not[18:47:17] <anli_> Adjusted, now I get positive values for x and y, updated the link[18:47:29] <anli_> hither and yon are still positive as they are distances[18:47:35] <derhass> your point is still off-screen[18:47:46] <derhass> it is clipped in x and y direction, still[18:48:14] <anli_> How do you know it is offscreen, is it the perspective case you mean?[18:48:29] <anli_> oh, should be, 20 degrees is not that much[18:48:30] *** Ad1 <Ad1!~Adrian@public-gprs383288.centertel.pl> has quit IRC (Ping timeout: 276 seconds)[18:49:08] <anli_> "Ah, the resulting coordinaets relative to viewport center" should have their maximum at 1?[18:49:20] <derhass> well[18:49:22] <derhass> indirectly[18:49:33] <derhass> it is better to look at the clip space[18:49:54] <derhass> 37 is never < 5[18:49:57] <derhass> <=[18:50:29] <anli_> Is clipspace what you are calling the "after multplying with this pmatrix" results?[18:50:38] <derhass> yes[18:50:44] <anli_> thx[18:51:06] <derhass> and, please, fix the visualization of your matrices[18:51:14] *** Occulus2057 <Occulus2057!~Alfred@24-113-48-48.wavecable.com> has joined ##OpenGL[18:51:40] *** ImQ009 <ImQ009!~ImQ009@unaffiliated/imq009> has quit IRC (Quit: Leaving)[18:52:00] *** ImQ009 <ImQ009!~ImQ009@unaffiliated/imq009> has joined ##OpenGL[18:52:33] *** Ad1 <Ad1!~Adrian@public-gprs383574.centertel.pl> has joined ##OpenGL[18:53:00] *** ratchetfreak <ratchetfreak!~ratchetfr@ptr-2hj4tbosgukogvvgjh90kfz9a.ip6.access.telenet.be> has quit IRC (Read error: Connection reset by peer)[18:53:28] *** ratchetfreak <ratchetfreak!~ratchetfr@ptr-2hj4tbosgukogvvgjh90kfz9a.ip6.access.telenet.be> has joined ##OpenGL[18:54:19] *** Codex_ <Codex_!~terop@91-157-91-164.elisa-laajakaista.fi> has joined ##OpenGL[18:55:13] *** Ad1 <Ad1!~Adrian@public-gprs383574.centertel.pl> has quit IRC (Max SendQ exceeded)[18:57:07] <anli_> But shouldnt it be 0 1 2 3 at the top, then 4 5 6 7 in the next row etc?[18:58:09] <anli_> I fix it[18:59:05] <anli_> I updated the link, do you want to check it?[19:00:20] <anli_> ortho seems kinda correct[19:00:33] <anli_> Strange that I get decimals[19:01:06] *** neure <neure!~tsuorant@a88-112-89-144.elisa-laajakaista.fi> has joined ##OpenGL[19:01:37] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has joined ##OpenGL[19:01:40] <anli_> Hm, I am outside the screen in the perspective case[19:01:52] *** kasper^ <kasper^!~safaf@82.137.8.18> has joined ##OpenGL[19:02:03] <anli_> I change the fov to 30 then[19:02:12] *** DrGonzo <DrGonzo!~DrBenway@190.18.153.73> has joined ##OpenGL[19:02:33] <anli_> Now its inside[19:03:02] <anli_> I think my understanding of projection matrices begins to come close to acceptability[19:03:15] <anli_> Thanks[19:03:44] *** DrBenway <DrBenway!~DrBenway@190.18.153.73> has quit IRC (Ping timeout: 244 seconds)[19:05:13] <Codex_> anli: you can always learn more[19:05:26] <anli_> You think the page shows the truth?[19:05:36] <Codex_> I missed the url[19:05:36] <anli_> Of course :)[19:05:43] <anli_> http://62.168.145.82/glmatrix/[19:06:16] <Codex_> yeah, that's ok[19:06:22] <anli_> :)[19:06:32] <anli_> Makes me happy[19:07:05] <Codex_> I'm currently thinking projection as "exists z.f(x,y,z)"[19:07:26] <Codex_> but that approach requires some category theory stuff[19:07:38] *** TomTsagk <TomTsagk!~tom@46.12.97.93.dsl.dyn.forthnet.gr> has joined ##OpenGL[19:10:16] <Codex_> basically (x,y,z)->(x,y) conversion kinda binds the z variable...[19:12:46] <derhass> anli_: since GL matrixes are traditionally stored column major, 0 1 2 3 is the first column, not the first row[19:12:46] *** TomTsagk <TomTsagk!~tom@46.12.97.93.dsl.dyn.forthnet.gr> has quit IRC (Read error: Connection reset by peer)[19:12:58] <derhass> anli_: looks OK now[19:13:08] *** kasper_ <kasper_!~safaf@82.137.8.21> has joined ##OpenGL[19:13:12] <nine_milli> hey are all constants the same between es 2 and desktop gl?[19:13:22] <anli_> derhass: thanks :)[19:13:24] <nine_milli> like gl_texture_2d, gl_clear_buffer_bit etc[19:13:25] *** kasper^ <kasper^!~safaf@82.137.8.18> has quit IRC (Ping timeout: 260 seconds)[19:13:33] <nine_milli> the same value that is[19:13:43] <anli_> derhass: I have to confess my code was incorrect, mat4 stores matrices as I expected[19:13:46] *** TomTsagk <TomTsagk!~tom@46.12.97.93.dsl.dyn.forthnet.gr> has joined ##OpenGL[19:14:03] *** karab44 <karab44!~karab44@unaffiliated/karab44> has quit IRC (Quit: Bye bye! o/)[19:15:26] *** TomTsagk <TomTsagk!~tom@46.12.97.93.dsl.dyn.forthnet.gr> has quit IRC (Client Quit)[19:19:46] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has quit IRC (Remote host closed the connection)[19:20:12] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has joined ##OpenGL[19:20:34] *** michauds <michauds!~michauds@modemcable197.154-80-70.mc.videotron.ca> has joined ##OpenGL[19:22:10] *** Leates <Leates!~Leates@unaffiliated/leates> has joined ##OpenGL[19:25:02] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has quit IRC (Ping timeout: 265 seconds)[19:25:03] *** kasper_ <kasper_!~safaf@82.137.8.21> has quit IRC (Ping timeout: 265 seconds)[19:25:23] *** tcsc <tcsc!sid721@gateway/web/mozilla/x-owkpsojxrjijzruq> has quit IRC (Remote host closed the connection)[19:26:33] *** michauds <michauds!~michauds@modemcable197.154-80-70.mc.videotron.ca> has quit IRC (Ping timeout: 248 seconds)[19:26:50] *** Leates <Leates!~Leates@unaffiliated/leates> has quit IRC (Ping timeout: 260 seconds)[19:31:20] *** joshsyn <joshsyn!~swoorup@220-253-130-5.dyn.iinet.net.au> has joined ##OpenGL[19:35:40] *** michauds <michauds!~michauds@modemcable197.154-80-70.mc.videotron.ca> has joined ##OpenGL[19:36:51] *** michauds <michauds!~michauds@modemcable197.154-80-70.mc.videotron.ca> has quit IRC (Remote host closed the connection)[19:36:57] *** ManDay <ManDay!~ManDay@unaffiliated/manday> has joined ##OpenGL[19:46:52] *** pavshn <pavshn!~pavshn@ppp95-165-153-84.pppoe.spdop.ru> has joined ##OpenGL[19:53:59] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has joined ##OpenGL[19:54:30] <nine_milli> can someone show me how to display a texture in modern gl[19:54:39] <nine_milli> i have a es 2 fragment adn vertex shader[19:54:45] <nine_milli> doesnt compile on osx[19:56:37] <nine_milli> http://pastebin.com/bf9H3VsV[19:56:43] <nine_milli> both versions there[19:57:09] <Codex_> how it fails in osx?[19:57:20] <nine_milli> nothing displays[19:58:02] <nine_milli> i quickly googled a few of the errors and saw i need a #version, in/out, and no gl_FragColor[19:58:04] *** upgrdman <upgrdman!~upgrdman@blender/artist/upgrdman> has joined ##OpenGL[19:58:08] <nine_milli> my quick attempt is in the pastebin[19:58:10] <Stragus> Print the info log, always[19:58:22] <nine_milli> i do it compiles now but nothing displays[19:58:49] <nine_milli> i have a feeling it’s the out_color[19:58:57] <nine_milli> how does gl know to use that var?[19:59:06] <nine_milli> instead of gl_FragColor[19:59:13] <Codex_> you have gluniform for the sampler?[20:00:39] <nine_milli> yes can you please look at the pastebin[20:00:56] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has quit IRC (Remote host closed the connection)[20:01:09] <Codex_> it didnt show the C code[20:01:30] <nine_milli> so gl_FragColor isnt used anymore?[20:01:33] *** slidercrank <slidercrank!~slidercra@unaffiliated/slidercrank> has joined ##OpenGL[20:01:37] <Codex_> yup[20:01:42] <nine_milli> what replaces it?[20:01:51] <Codex_> just out variable[20:02:44] *** groton <groton!~groton@unaffiliated/groton> has joined ##OpenGL[20:03:21] <Codex_> dunno exactly how it chooses the right variable, you have many out vars[20:06:17] *** match_ita <match_ita!~Giovanni@dynamic-adsl-78-14-227-127.clienti.tiscali.it> has quit IRC (Quit: It 's better to be optimistic and be wrong , than to be pessimistic and to be right - Albert Einstein)[20:07:34] *** groton <groton!~groton@unaffiliated/groton> has quit IRC (Ping timeout: 265 seconds)[20:07:55] <Codex_> but probably the fragment only needs color and depth[20:08:13] *** pavshn <pavshn!~pavshn@ppp95-165-153-84.pppoe.spdop.ru> has quit IRC (Quit: My MacBook Air has gone to sleep. ZZZzzz…)[20:10:16] *** Th30n <Th30n!~Th30n@93-136-64-202.adsl.net.t-com.hr> has quit IRC (Quit: leaving)[20:12:08] *** Ad1 <Ad1!~Adrian@public-gprs383518.centertel.pl> has joined ##OpenGL[20:12:59] *** Emersont1 <Emersont1!~Emersont1@host109-155-0-22.range109-155.btcentralplus.com> has joined ##OpenGL[20:13:53] *** raroni86 <raroni86!~rasmus@3224056-cl69.boa.fiberby.dk> has quit IRC (Ping timeout: 240 seconds)[20:14:14] *** raroni86 <raroni86!~rasmus@3224056-cl69.boa.fiberby.dk> has joined ##OpenGL[20:14:33] <nine_milli> is there any example of just displaying a texture on a quad in modern gl[20:14:35] *** Emersont1 <Emersont1!~Emersont1@host109-155-0-22.range109-155.btcentralplus.com> has left ##OpenGL[20:14:40] <nine_milli> this should be as basic as it gets[20:14:55] <derhass> nine_milli: https://www-user.tu-chemnitz.de/~heinm/tmp/HelloTexture.c[20:14:58] <Stragus> Tutorials found in the channel's topic should have that[20:15:22] <derhass> ok, that depends on how you define "basic"[20:17:11] *** Leates <Leates!~Leates@unaffiliated/leates> has joined ##OpenGL[20:17:57] *** therue <therue!~therue@1-162-80-44.dynamic.hinet.net> has quit IRC (Quit: therue)[20:18:09] <nine_milli> really only difference i see is #version 150 core\[20:18:12] <nine_milli> let me try that[20:18:20] <nine_milli> wtf is that opengl version or something?[20:18:44] *** z3r0_ <z3r0_!~z3r0@41.86.240.102> has joined ##OpenGL[20:19:35] <slime> https://www.opengl.org/wiki/Core_Language_(GLSL)#OpenGL_and_GLSL_versions[20:20:23] *** AndChat698676 <AndChat698676!~AndChat69@247.ip-149-56-108.net> has joined ##OpenGL[20:21:46] <derhass> nine_milli: well, you can;t use the "texture" function without a #version directive[20:21:58] <derhass> that one was introduced in GLSL 1.30[20:22:19] <AndChat698676> Hi what is the problem of draw lines on opengl es 2 and above, I have gap in line strip[20:26:26] <nine_milli> i changed the texture function to " out_Color = vec4(1.0, 1.0, 1.0, 1.0);\n" +[20:26:36] <nine_milli> was hoping to see a white screen but still black[20:26:53] <nine_milli> makes me think its the coords[20:26:59] <nine_milli> but it runs fine on es 2.0[20:28:13] *** vijai <vijai!vijai@gateway/shell/openshells.net/x-bzdluirosddhkmah> has quit IRC (Quit: WeeChat 1.5)[20:28:24] *** Ploppz <Ploppz!~ploppz@2001:700:303:b:f3ce:ca7c:3834:8e44> has joined ##OpenGL[20:29:39] *** kasper^ <kasper^!~safaf@82.137.13.45> has joined ##OpenGL[20:30:14] *** z3r0_ <z3r0_!~z3r0@41.86.240.102> has quit IRC (Quit: Leaving)[20:30:56] *** Salvakiya <Salvakiya!~Salvakiya@host109-154-253-144.range109-154.btcentralplus.com> has quit IRC (Quit: Leaving)[20:32:41] *** monsterjamp <monsterjamp!uid156866@gateway/web/irccloud.com/x-lgixccyvidfwxxdk> has quit IRC (Quit: Connection closed for inactivity)[20:33:14] <nine_milli> are all constants the same on different gl versions?[20:33:25] *** ArkaZeen <ArkaZeen!~ArkaZeen@rn-nat-129-97-131-0.dynamic.uwaterloo.ca> has quit IRC ()[20:36:34] *** pril <pril!userid@unaffiliated/pril> has quit IRC (Ping timeout: 240 seconds)[20:37:27] *** tm604 <tm604!~tom@pdpc/supporter/professional/tm604> has quit IRC (Ping timeout: 244 seconds)[20:37:39] *** ibouvousaime <ibouvousaime!~ibouvousa@41.83.41.121> has joined ##OpenGL[20:38:02] *** AndChat698676 <AndChat698676!~AndChat69@247.ip-149-56-108.net> has left ##OpenGL ("Leaving")[20:39:46] *** tm604 <tm604!~tom@cpc12-lewi14-2-0-cust47.2-4.cable.virginm.net> has joined ##OpenGL[20:39:56] *** tm604 <tm604!~tom@cpc12-lewi14-2-0-cust47.2-4.cable.virginm.net> has quit IRC (Changing host)[20:39:56] *** tm604 <tm604!~tom@pdpc/supporter/professional/tm604> has joined ##OpenGL[20:40:22] <dahlia> nine_milli: you mean the sympolic constants? I think they add some as versions go higher and probably take out some deprecated ones. If you mean their associated values, I have no idea.[20:41:31] *** ManDay <ManDay!~ManDay@unaffiliated/manday> has quit IRC (Quit: WeeChat 1.4)[20:43:58] *** rawrawrer <rawrawrer!~rawrawrer@c58-111-144-57.thorn2.nsw.optusnet.com.au> has quit IRC (Quit: rawrawrer)[20:48:07] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has joined ##OpenGL[20:49:21] *** Jeanne-Kamikaze <Jeanne-Kamikaze!~Jeanne-Ka@102.red-81-43-172.staticip.rima-tde.net> has joined ##OpenGL[20:50:25] <nine_milli> im getting angry[20:51:00] <nine_milli> does modern gl require a framebuffer or a renderbuffer or some shit[20:51:11] <nine_milli> glDrawrArrays just seems to do nothing[20:51:22] <derhass> a VAO[20:51:23] <Stragus> No, you can use the default framebuffer from the window[20:51:24] <derhass> and shaders[20:51:38] *** sandeepkr__ <sandeepkr__!~sandeepkr@111.235.65.5> has joined ##OpenGL[20:55:04] *** kuldeep <kuldeep!~kuldeep@unaffiliated/kuldeepdhaka> has quit IRC (Ping timeout: 240 seconds)[20:55:54] *** sandeepkr_ <sandeepkr_!~sandeepkr@103.49.155.114> has quit IRC (Ping timeout: 276 seconds)[20:58:07] *** INSANU <INSANU!~jhonny@186.213.190.252> has quit IRC (Ping timeout: 244 seconds)[21:00:57] *** SHC <SHC!~quassel@59.90.24.191> has quit IRC (Remote host closed the connection)[21:05:54] *** ertesx is now known as ertes[21:06:26] *** kuldeep <kuldeep!~kuldeep@unaffiliated/kuldeepdhaka> has joined ##OpenGL[21:10:17] *** pril <pril!userid@unaffiliated/pril> has joined ##OpenGL[21:15:47] *** anli_ <anli_!~anders@217-211-66-29-no23.tbcn.telia.com> has quit IRC (Ping timeout: 272 seconds)[21:17:36] <nine_milli> glDrawArrays is returning error 1282[21:18:31] <derhass> nine_milli: do you have a VAO bound?[21:19:58] <nine_milli> no, i use ECGL.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX, ECGL.GL_FLOAT, false,vertexStride, vertexBuffer);[21:20:09] <nine_milli> pass a pointer of data to it[21:20:32] <derhass> that's not how it works in modern GL[21:20:58] <nine_milli> what u mean?[21:21:30] <derhass> modern GL requires the use of VAOs[21:21:37] <nine_milli> shit[21:21:41] <derhass> and it does not support client-side vertex arrays[21:22:06] <nine_milli> damn if only angle was finished for mac[21:23:25] <nine_milli> can i override ECGL.glVertexAttribPointer to generate a buffer and bind it[21:23:30] <nine_milli> just for testing of course[21:23:54] <derhass> I don't even know what ECGL is[21:24:42] *** ImQ009 <ImQ009!~ImQ009@unaffiliated/imq009> has quit IRC (Read error: Connection reset by peer)[21:33:48] *** nine_milli <nine_milli!~nine_mill@32.211.52.104> has quit IRC (Quit: nine_milli)[21:36:29] *** GarrettShields <GarrettShields!~GarrettSh@CPE3497f6605400-CMbc14013107e0.cpe.net.cable.rogers.com> has quit IRC (Quit: twitter.com/GarrettShields)[21:41:13] *** raroni86 <raroni86!~rasmus@3224056-cl69.boa.fiberby.dk> has quit IRC (Quit: leaving)[21:43:05] *** tambre <tambre!~tambre@85fd-7029-386d-48c1-a980-8a3e-07d0-2001.dyn.estpak.ee> has quit IRC (Ping timeout: 248 seconds)[21:54:23] *** Jeanne-Kamikaze <Jeanne-Kamikaze!~Jeanne-Ka@102.red-81-43-172.staticip.rima-tde.net> has quit IRC (Ping timeout: 265 seconds)[21:57:10] *** xCrypto <xCrypto!~xCrypto@drmons0544w-142177154202.dhcp-dynamic.FibreOp.ns.bellaliant.net> has quit IRC (Quit: Nettalk6 - www.ntalk.de)[22:00:37] *** xCrypto <xCrypto!~xCrypto@drmons0544w-142177154202.dhcp-dynamic.FibreOp.ns.bellaliant.net> has joined ##OpenGL[22:04:16] *** groton <groton!~groton@unaffiliated/groton> has joined ##OpenGL[22:06:33] *** shingshang <shingshang!~shingshan@115-64-27-246.static.tpgi.com.au> has quit IRC (Ping timeout: 265 seconds)[22:08:17] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has quit IRC (Remote host closed the connection)[22:08:50] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has joined ##OpenGL[22:09:10] *** SwiftMatt <SwiftMatt!~Objective@162.242.94.252> has quit IRC (Quit: My MacBook Pro has gone to sleep. 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ZZZzzz…)[22:26:25] *** subli <subli!~renegade@90-230-90-249-no148.tbcn.telia.com> has joined ##OpenGL[22:26:32] *** subli <subli!~renegade@90-230-90-249-no148.tbcn.telia.com> has quit IRC (Client Quit)[22:27:07] *** Kingsquee <Kingsquee!~kingsley@d154-20-149-39.bchsia.telus.net> has joined ##OpenGL[22:50:35] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has joined ##OpenGL[22:51:16] *** neure <neure!~tsuorant@a88-112-89-144.elisa-laajakaista.fi> has quit IRC (Read error: Connection reset by peer)[22:51:44] *** kasper_ <kasper_!~safaf@82.137.12.84> has joined ##OpenGL[22:53:08] *** kasper^ <kasper^!~safaf@82.137.13.45> has quit IRC (Ping timeout: 244 seconds)[22:54:14] *** Jeanne-Kamikaze <Jeanne-Kamikaze!~Jeanne-Ka@102.red-81-43-172.staticip.rima-tde.net> has joined ##OpenGL[22:55:05] *** Zerflag <Zerflag!~zerflag@216-19-179-103.dyn.novuscom.net> has quit IRC (Ping timeout: 260 seconds)[22:57:01] *** Waynes <Waynes!~wayness@23.94.61.168> has quit IRC (Quit: Leaving.)[22:58:25] *** SwiftMatt <SwiftMatt!~Objective@162.242.94.252> has joined ##OpenGL[23:00:15] <btipling> I finally figured out depth testing in Metal heh, usually OpenGL docs help me, but in this case Metal was quite divergent[23:00:38] <btipling> you have to set a depthStencilPixelFormat on a bunch of things[23:01:19] <btipling> this is one case in which the OpenGL API is much simpler[23:04:49] *** pa <pa!~pa@unaffiliated/pa> has quit IRC (Ping timeout: 255 seconds)[23:06:05] <Xeek> I'm determined to make nanovg work. I really don't want to spend the next month making my own[23:06:08] *** TechnoCrunch <TechnoCrunch!~Tech@101.100.137.146> has joined ##OpenGL[23:06:19] *** seaworthy <seaworthy!~seaworthy@cpe-76-175-69-134.socal.res.rr.com> has joined ##OpenGL[23:06:19] *** seaworthy <seaworthy!~seaworthy@cpe-76-175-69-134.socal.res.rr.com> has quit IRC (Changing host)[23:06:19] *** seaworthy <seaworthy!~seaworthy@unaffiliated/seaworthy> has joined ##OpenGL[23:06:21] <Xeek> at least the author of the project is communicative :-)[23:07:37] *** Jackneill <Jackneill!~Jackneill@unaffiliated/jackneill> has quit IRC (Remote host closed the connection)[23:08:25] *** kasper^ <kasper^!~safaf@82.137.13.105> has joined ##OpenGL[23:10:50] *** kasper_ <kasper_!~safaf@82.137.12.84> has quit IRC (Ping timeout: 265 seconds)[23:11:48] *** pril <pril!userid@unaffiliated/pril> has quit IRC (Ping timeout: 265 seconds)[23:17:02] *** stefkos <stefkos!~stefkos@82.177.144.226> has quit IRC (Quit: Leaving)[23:18:04] *** pa <pa!~pa@unaffiliated/pa> has joined ##OpenGL[23:19:24] <slime> btipling: don't you have to in GL as well?[23:19:30] <btipling> do you?[23:19:48] <btipling> I think there's a sane default[23:19:54] <slime> yeah. in the case of the default framebuffer in GL it's a bit different because you request a bitdepth for the depth buffer, when creating the context[23:20:05] <btipling> oh[23:20:30] *** groton <groton!~groton@unaffiliated/groton> has quit IRC (Quit: groton)[23:20:53] <btipling> that might have been one of those things that I was doing but didn't understand why I was doing it :S[23:21:31] *** pavshn <pavshn!~pavshn@ppp95-165-153-84.pppoe.spdop.ru> has joined ##OpenGL[23:23:25] *** feliwir <feliwir!Elite16673@gateway/shell/elitebnc/x-xorwkpivtvfjccpo> has joined ##OpenGL[23:24:48] *** irrenhaus4 <irrenhaus4!~xenon@HSI-KBW-046-005-253-022.hsi8.kabel-badenwuerttemberg.de> has quit IRC (Quit: leaving)[23:25:04] *** irrenhaus3 <irrenhaus3!~xenon@HSI-KBW-046-005-253-022.hsi8.kabel-badenwuerttemberg.de> has joined ##OpenGL[23:27:44] <Xeek> maybe this is normal, glClear ignorres the alpha channel?[23:28:45] <derhass> what do you mean by that?[23:29:34] *** Suchorski <Suchorski!regex@unaffiliated/suchorski> has quit IRC (Ping timeout: 255 seconds)[23:29:35] <Xeek> glClear(1, 1, 1, 0) clears opaque white when I'm bound to an fbo setup with an rgba texture[23:30:12] *** Suchorski <Suchorski!~regex@189-13-147-147.user.veloxzone.com.br> has joined ##OpenGL[23:30:20] <derhass> you mean glClearColor?[23:30:31] *** notadeveloper <notadeveloper!~letsmakej@2602:306:bd2a:a160:f066:409f:1aba:9341> has joined ##OpenGL[23:30:31] *** Suchorski <Suchorski!~regex@189-13-147-147.user.veloxzone.com.br> has quit IRC (Changing host)[23:30:31] *** Suchorski <Suchorski!~regex@unaffiliated/suchorski> has joined ##OpenGL[23:30:33] <Xeek> yeah .. got lazy with my typing :-)[23:31:37] <derhass> glClear will clear to the clear color[23:31:57] <derhass> for all the channels it is allowed to[23:31:58] *** konom <konom!~tamatias@141.15.138.77.rev.sfr.net> has quit IRC (Quit: Leaving)[23:32:22] * Xeek interprest that as yes[23:32:28] <Xeek> or rather, "no"[23:32:49] <btipling> glClear and glClearColor are totally different things[23:32:51] <Xeek> how do I allow it to utilize the alpha channel? glColorMask had no effect[23:32:58] <btipling> https://www.opengl.org/sdk/docs/man2/xhtml/glClear.xml https://www.khronos.org/opengles/sdk/docs/man/xhtml/glClearColor.xml[23:33:05] <Xeek> btipling: yeah, two functions.[23:33:17] <derhass> Xeek: what makes you think it doesn't?[23:33:25] <derhass> I'm not really convinced[23:33:50] *** flavi0 <flavi0!~anon@unaffiliated/flavi0> has quit IRC (Quit: leaving)[23:33:58] <Xeek> derhass: observation[23:34:19] <derhass> but how?[23:34:42] <Xeek> derhass: "makes me think" <-- actually I was thinking it would clear the alpha as well, but it's not, whence the question[23:34:43] <derhass> maybe your blending setup is just screwed[23:35:20] <Xeek> maybe so; though it's only a call to glEnable and glBlendFunc with very common parameters[23:36:11] *** pril <pril!~userid@unaffiliated/pril> has joined ##OpenGL[23:36:47] <derhass> Xeek: show the code[23:37:59] <Xeek> if glClear is indeed affect by the alpha channel set by glClearColor, then I have the answer. The code is quite a bit too involved, I just want to make sure I'm seeing what's wrong and not just chasing down a false issue with my code.[23:38:07] *** notadeveloper <notadeveloper!~letsmakej@2602:306:bd2a:a160:f066:409f:1aba:9341> has quit IRC (Read error: Connection reset by peer)[23:38:33] *** notadeveloper <notadeveloper!~letsmakej@2602:306:bd2a:a160:f066:409f:1aba:9341> has joined ##OpenGL[23:39:05] <slime> Xeek: it does clear the alpha, but that doesn't mean it will show the contents of your desktop behind it[23:39:09] *** ibouvousaime <ibouvousaime!~ibouvousa@41.83.41.121> has joined ##OpenGL[23:39:19] <slime> some OS apis support that after you enable an api setting[23:40:33] <slime> (and with a performance hit)[23:41:19] <derhass> I don't think Xeek expects an FBO to become transparent to the desktop[23:41:27] <Xeek> slime: certainly, this is rendering to a texture so I expect to see whats behind it not whats behind my window :-P[23:42:17] <slime> what's your blend mode? (1, 1, 1, 0) will be full opaque white if you're using premultiplied blending[23:42:26] <Xeek> without glClear my FBO is certainly transparent when I draw it to the screen :-\ My glClear is broken :-([23:42:49] <Xeek> slime: that makes me think nanovg is using premultiplied, that's an idea.[23:42:51] <slime> (0, 0, 0, 0) would be the correct color for transparency if you're using premultiplied blending[23:43:10] * Xeek digs in nanovg's code[23:43:11] <slime> since premultiplied blending expects the colors you use to have their alpha component already multiplied with the rgb[23:43:46] <Xeek> nvgCreateImageRGBA(ctx, w, h, imageFlags | NVG_IMAGE_FLIPY | NVG_IMAGE_PREMULTIPLIED, NULL);[23:43:51] <Xeek> I think you solved the mystery.[23:44:25] *** kuldeep <kuldeep!~kuldeep@unaffiliated/kuldeepdhaka> has quit IRC (Ping timeout: 255 seconds)[23:45:04] *** sandeepkr__ <sandeepkr__!~sandeepkr@111.235.65.5> has quit IRC (Ping timeout: 265 seconds)[23:46:22] *** ibouvousaime <ibouvousaime!~ibouvousa@41.83.41.121> has quit IRC (Quit: Konversation terminated!)[23:46:44] <Xeek> yeah, 0,0,0,0 works as expected.[23:48:51] *** ibouvousaime <ibouvousaime!~ibouvousa@41.82.50.229> has joined ##OpenGL[23:51:38] <btipling> nice[23:53:04] <Xeek> actually it's good that it's doing this[23:53:20] <Xeek> antialias will actually look right on white or black backgrounds[23:53:57] <btipling> nvg seems pretty cool tbh[23:54:33] *** Suchorski <Suchorski!~regex@unaffiliated/suchorski> has quit IRC (Ping timeout: 250 seconds)[23:55:03] <Xeek> btipling: it is, but it's still considered a bit unpolished. It's much less of a dependency than even cairo or skia, but the license is also more open[23:55:17] <Xeek> learning it's quirks and working around bugs, that's the issue[23:55:25] *** Suchorski <Suchorski!regex@177-179-55-118.user.veloxzone.com.br> has joined ##OpenGL[23:55:25] *** Suchorski <Suchorski!regex@177-179-55-118.user.veloxzone.com.br> has quit IRC (Changing host)[23:55:25] *** Suchorski <Suchorski!regex@unaffiliated/suchorski> has joined ##OpenGL[23:55:49] <btipling> well you're also helping the developer make it better by working with them to let them know about the issues[23:55:52] <btipling> so that's good[23:56:05] <Xeek> well I was afraid of that at first, wasn't so sure how active the dev is[23:56:26] <Xeek> he's been replying back to me on one issue I reported, that's good[23:56:33] *** ibouvousaime <ibouvousaime!~ibouvousa@41.82.50.229> has quit IRC (Ping timeout: 240 seconds)[23:56:56] <Xeek> im using his library to make a graphics class similar to what it is in .NET or GDI+[23:57:23] <Xeek> by default the class renders to the screen but if you construct it with a width and height it renders to an fbo, keeping it simple.[23:57:48] *** kuldeep <kuldeep!~kuldeep@unaffiliated/kuldeepdhaka> has joined ##OpenGL[23:57:49] <btipling> Xeek you're making a UI for televisions?[23:58:28] *** sandeepkr__ <sandeepkr__!~sandeepkr@103.49.155.114> has joined ##OpenGL[23:58:32] <Xeek> btipling: no, uhm, what? heh[23:58:39] <btipling> https://github.com/xeekworx/FrugtalTV[23:58:45] <btipling> I thought maybe that was related[23:58:58] <btipling> I saw your issue on nanovg and looked at your repo :P[23:59:14] <Xeek> btipling: that's not the project I'm working on here, but I do find it funny you just picked a random github project of mine and assumed that was this[23:59:24] *** Suchorski <Suchorski!regex@unaffiliated/suchorski> has left ##OpenGL[23:59:26] <btipling> because it was just updated :P[23:59:33] <btipling> but it didn't have any opengl code[23:59:34] <btipling> so[23:59:35] <btipling> :\[23:59:35] <Xeek> oh, that's for a friends youtube channel[23:59:38] <btipling> nice[23:59:39] <Xeek> it's just gfx[23:59:47] <Xeek> he needed a logo, so I made him one :-)