November 6, 2014 
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November 6, 2014 [00:06:20] *** Ad1 has quit IRC[00:10:20] *** derhass_ has joined ##OpenGL[00:12:26] *** ShadowIce has quit IRC[00:13:30] *** derhass has quit IRC[00:22:24] *** TheBunnyZOS has quit IRC[00:22:33] *** dreamminder has quit IRC[00:22:57] *** AbigailBuccaneer has quit IRC[00:23:16] *** AbigailBuccaneer has joined ##OpenGL[00:26:49] *** shintah has quit IRC[00:29:37] *** paperManu has quit IRC[00:32:28] *** paul424 has quit IRC[00:32:44] *** jdolan has quit IRC[00:36:21] *** razieliyo has quit IRC[00:36:43] *** qeed has joined ##OpenGL[00:37:25] *** Ryp has joined ##OpenGL[00:38:19] *** b4b has joined ##OpenGL[00:39:21] *** konom has quit IRC[00:41:53] *** Ryp has quit IRC[00:42:18] *** b4b has quit IRC[00:44:15] *** SurgeMedic has quit IRC[00:45:05] *** b4b has joined ##OpenGL[00:52:20] *** Twinklebear has joined ##OpenGL[00:53:55] *** BitPuffin has joined ##OpenGL[00:54:38] *** BitPuffin has quit IRC[00:57:20] *** Demon_Fox has joined ##OpenGL[00:57:54] *** BitPuffin has joined ##OpenGL[01:01:01] *** staylor has quit IRC[01:05:30] *** puerum has joined ##OpenGL[01:11:06] *** derhass_ has quit IRC[01:11:22] *** levertourist has quit IRC[01:14:31] *** AbiBuccaneer has joined ##OpenGL[01:17:39] *** AbigailBuccaneer has quit IRC[01:18:20] *** pabb has joined ##OpenGL[01:18:34] *** charlie5 has joined ##OpenGL[01:21:32] *** SurgeMedic has joined ##OpenGL[01:21:45] *** jreyno40_ has joined ##OpenGL[01:23:27] *** Kane has quit IRC[01:28:54] *** paperManu has joined ##OpenGL[01:28:55] *** centrinia has quit IRC[01:38:07] *** Crehl has quit IRC[01:40:29] *** hexagoxel_ has joined ##OpenGL[01:43:36] *** moeSeth_ has joined ##OpenGL[01:44:18] *** hexagoxel has quit IRC[01:45:18] *** BreadProduct has quit IRC[01:59:59] *** linuxuz3r has joined ##OpenGL[02:02:39] *** kuldeepdhaka has joined ##OpenGL[02:05:20] *** Guest20536 has joined ##OpenGL[02:08:53] *** slidercrank has quit IRC[02:11:40] *** bjz_ has quit IRC[02:16:03] *** hexagoxel_ has quit IRC[02:16:27] *** linuxuz3r has quit IRC[02:21:49] *** SurgeMedic has quit IRC[02:26:36] *** ra4king has quit IRC[02:27:56] *** ra4king has joined ##OpenGL[02:29:23] *** souper123 has joined ##OpenGL[02:29:32] <souper123> does anyone here know how do do AABB sweeping[02:33:52] *** souper123 has quit IRC[02:46:25] *** robot-beethoven has joined ##OpenGL[02:58:40] *** roboman2444 has quit IRC[02:59:08] *** SurgeMedic has joined ##OpenGL[03:00:56] *** hahuang65 has quit IRC[03:01:09] *** Syzygy__ has joined ##OpenGL[03:01:11] *** xishe has quit IRC[03:01:17] *** fatalhalt has joined ##OpenGL[03:01:34] *** xishe has joined ##OpenGL[03:03:29] *** Syzygy_ has quit IRC[03:07:06] *** jbud has joined ##OpenGL[03:07:51] *** jdolan has joined ##OpenGL[03:08:25] *** Dark_Confidant has quit IRC[03:08:25] *** Dark_Confidant|m has joined ##OpenGL[03:09:03] <jbud> Hey guys, I'm running into a weird problem with my program where the mesh appears to bounce around when I'm moving the camera: https://www.youtube.com/watch?v=NDbzIxmjWzM[03:10:00] <jbud> I was told that its likely a depth fighting issue, but I thought would be fixed behind the scenes with this: enable(GL.DEPTH_TEST), depthFunc(GL.LEQUAL)[03:17:36] *** roboman2444 has joined ##OpenGL[03:19:26] <XMPPwocky> that is not how you fix depth fighting[03:22:29] <jbud> XMPPwocky: How can I fix the depth fighting ?? I was looking up on the depth buffer, and thought that that was the solution[03:23:10] <XMPPwocky> no, depth fighting is a consequence of the depth buffer (and limited precision and FPU inaccuracy in it)[03:23:34] <XMPPwocky> move the things that are fighting apart, slightly[03:23:38] *** theripper93 has joined ##OpenGL[03:24:32] <roboman2444> you can also do some weird stuff with a projection matrix as well[03:24:42] <jbud> I get it..but if that's the case then I don't think my problem is depth fighting after all[03:24:46] <roboman2444> so you dont get any parrallax[03:25:21] *** Orion] has quit IRC[03:26:44] <Stragus> jbud, what does your matrix look like? Are the near and far planes reasonable? Also avoid rendering different geometry with a very similar depth[03:27:32] <jbud> Stragus: they both use the same matrices, but separate shaders: vec4 position = uPMatrix * uVMatrix * uMVMatrix * vec4(aVertexCoord, 1.0);[03:28:34] <Stragus> Woah, what are you doing multiplying 3 matrices in your vertex shader? Can't you just pre-multiply that once *outside* the shader?[03:28:47] <jbud> My near plane is 1.0 and far plane is 400000.0 ... that shouldn't be too bad right?[03:29:04] <jbud> Stragus: optimization comes next, but you're right its grossly inefficient of me :)[03:29:12] <Stragus> That's a large range. What's the approximate distance of your geometry?[03:29:14] *** JoshSyn has joined ##OpenGL[03:29:51] <jbud> Stragus: Its hard to say, the terrain is actually being generated on the fly. But they're probably quite close, I can get a rough estimate[03:29:55] <Stragus> (Sorry I haven't seen the video, I avoid Flash)[03:30:06] <jbud> Doesn't youtube use html5 now for video?[03:30:29] <Stragus> Seems still to request Flash in Firefox[03:30:46] <jbud> Too bad, I thought the html5 was a nice upgrade[03:31:56] <Stragus> Okay, that's a serious and unexpected depth buffer glitch[03:32:15] <jbud> Stragus: Oh damn! You were totally right I think[03:32:15] <Stragus> I feel like the distance to that terrain must be large, far from that 1.0 near plane[03:32:32] <jbud> Its the far plane, when I took it down by a factor of 10 it stopped doing that[03:33:23] <jbud> No it didn't :D It only fixed it from close up..its still an issue when I back up a little bit[03:33:25] <Stragus> Generally, the near plane is a more serious issue than the far plane[03:33:35] <Stragus> You can even put the far plane at infinity[03:33:47] <Stragus> What's the approximate distance to your geometry?[03:33:52] <jbud> Yeah I figured the only issue between near/far plane would be floating point precision issues[03:34:54] <Stragus> You'll typically have 24 bits of depth buffer precision, so it's not quite float, a range of 16M values[03:34:56] <jbud> Stragus: ~35 units[03:36:26] <jbud> I guess I should still be fine for the near/far plane though, that's a lot less precision than float, but not enough to affect me I don't think[03:36:48] <theripper93> Hey guys, i'm just starting using opengl and I never have coded anything 3D before. I'm using the Nehe tutorials. I know it's an old source that uses the legacy version of opengl, but you guys think I should learn it anyway or jump to the modern opengl?[03:37:55] <Stragus> jbud, I guess your range is just too high for the precision required[03:38:23] <Stragus> I have a far/near ratio of 1024.0 here : http://www.rayforce.net/newproject024.png[03:38:48] <Stragus> theripper93, I would go straight to modern OpenGL, or you'll have to un-learn a bunch of stuff[03:39:15] <Stragus> The fixed pipeline has been replaced by a programmable pipeline where you control how the different stages operate, especially the vertex and fragment shader stages[03:40:10] <jbud> Stragus: Wow damn! You're able to see way further than I would have expected for a 1024 ratio, I guess you just make everything much much smaller?[03:40:37] <Stragus> The scale doesn't matter, it's just a matter of proportions[03:41:12] <theripper93> Stragus, thank you. I'll consider it. I just didn't found a good source begginers to modern GL like Nehe's. Guess I keep looking then.[03:41:43] <Stragus> jbud, the far clipping plane terminates exactly where the "fog" makes things disappear for maximum depth buffer precision : http://www.rayforce.net/newproject030.png[03:41:44] <theripper93> Stragus, I don't have a problem to unlearn things and learn again in a better way, but time is priceless. Well, thanks a lot.[03:42:36] <Stragus> theripper93, sorry I don't actually know what the best source to learn from scratch is these days... someone else may suggest something :)[03:42:58] <Stragus> I learned OpenGL in the days of the fixed pipeline and followed the evolution[03:43:03] <jbud> I just read the opengl Red book, and started on my own project[03:43:22] <jbud> I'm still a noob, but its enough to start on my projects at least[03:43:26] <Stragus> The Red Book is great but it must be the latest paper version. The free online version is very outdated[03:43:40] <jbud> God yeah, get the new one, theripper93[03:44:33] <Stragus> jbud, in your engine, think at what distance do you want geometry to "disappear" and make the far plane exactly that[03:44:37] *** wiky has joined ##OpenGL[03:44:47] <theripper93> Ok. I'll look for a copy. Maybe I can find a cheap and used one (or maybe not that cheap, but :P).[03:45:15] <jbud> Stragus: thanks for the help, I've been banging my head over this one for a while before coming here :)[03:45:42] <jbud> Btw those pics you sent look awesome[03:45:48] <Stragus> :) Cool, feel free to ask earlier next time[03:46:10] <Stragus> Thanks, it was a side pet project about an year ago, before the regular work left me with no spare time[03:46:15] <jbud> Hahah maybe I should. Clearly I can't solve everything on my own[03:46:26] <LeelooMinai> I did kind of a "crash course" learning of OpenGL for my purposes, and it wasn't pretty - seems that everything could be done in at least 3 ways, all of them weird, and trying to get details on them was even more confusing:)[03:47:07] <Stragus> In software programming, there are always many ways to solve any non-trivial problem[03:47:38] <Textmode> none of them good. :3[03:47:46] <Stragus> That too :)[03:48:41] *** Hunts has joined ##OpenGL[03:50:34] <LeelooMinai> That's understandable... But I found OpenGL API to be PITA - it's difficult to figure out what is valid and under what circumstances, what will be the outcome in terms of performance, and what steps should be followed to achieve anything.[03:51:17] <Stragus> You need to read something that explains how the pipeline really works then, this "crash course" may not have been appropriate[03:52:09] <LeelooMinai> I just describe dealing with the API itself.[03:52:12] <glYoda> "it's difficult to figure out what is valid and under what circumstances, what will be the outcome in terms of performance, and what steps should be followed to achieve anything." …I'd disagree[03:52:28] *** HuntsMan has quit IRC[03:52:35] <glYoda> correctness is well defined within the API and shading language specifications[03:53:23] <glYoda> performance OTOH is something you'll have to profile across platforms / vendors etc. but this isn't unique to the GL[03:53:38] <glYoda> you'll need to follow a similar path for any accelerated 3D or 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IRC[07:51:48] *** Khlorghaal has quit IRC[07:52:42] *** TyrfingMjolnir has joined ##OpenGL[07:53:03] *** esgl has quit IRC[07:56:20] *** diegov_ has quit IRC[07:58:45] *** TyrfingMjolnir has quit IRC[07:59:25] *** ValicekB has quit IRC[08:02:54] *** TheTeapot has quit IRC[08:03:04] *** MLM has quit IRC[08:05:07] <Textmode> What version is glPolygonStipple in?[08:05:14] *** TyrfingMjolnir has joined ##OpenGL[08:06:20] <slime> legacy GL (1.x and 2.x), it's not in core GL3+ or GLES2+ or webgl[08:06:38] <Textmode> hmm…[08:07:13] *** TyrfingMjolnir has quit IRC[08:08:50] <glYoda> it's trivial enough to emulate tho[08:09:41] *** TheTeapot has joined ##OpenGL[08:09:46] *** ValicekB has joined ##OpenGL[08:09:56] *** Zupo has joined ##OpenGL[08:10:45] <Textmode> glYoda: on the contrary; I have it working in modern GL. i'm trying to figure out how to make it work on older hardware.[08:11:06] <glYoda> well it's even easier… use PolygonStipple directly then[08:11:16] *** TyrfingMjolnir has joined ##OpenGL[08:11:17] <Textmode> indeed :3[08:12:11] <Textmode> can I reasonably expect modern hardware to support legacy GL?[08:12:22] <glYoda> (a) PolygonStipple, (b) EXT_gpu_shader4 + texelFetch, ( c ) everything in (b) along with EXT_texture_integer to simplify bitmap handing[08:12:34] <Textmode> or do I have to do some sniffing and switch to the pipeline it "expects"?[08:12:39] <glYoda> you have the 3 options above to choose from[08:12:56] <glYoda> "can I reasonably expect modern hardware to support legacy GL?" …of course not[08:13:26] <Textmode> howso?[08:13:37] <glYoda> assuming you've chosen a core API profile (and for newer GL features on certain platforms this is ALL you'll have to work with) PolygonStipple won't ever be available to you[08:13:59] <glYoda> i.e. this was deprecated under GL >= 3.x[08:14:07] *** TyrfingMjolnir has quit IRC[08:14:25] <glYoda> in which case you'll need to target options (b) or ( c ) above[08:14:28] <Textmode> glYoda: right, but if I request GL2 or GL1 ?[08:14:59] *** CainJacobi has quit IRC[08:15:26] <glYoda> then you'll lose support for anything outside of that version on certain platforms (i.e. platforms which ARB_compatibility isn't a supported API feature)[08:15:35] <glYoda> so choose wisely[08:16:14] <glYoda> honestly I'm not sure why you'd ever waste the time and effort to maintain a compatibility path for this feature… IF you need it then do it through the programmable pipeline[08:16:17] <glYoda> period[08:16:48] <glYoda> hell you can implement a completely spec compliant path for polygon stipple on anything D3D10 level for instance[08:16:59] <glYoda> (using SM4 and integer textures)[08:18:06] <glYoda> if one is willing to reorder the bitmap data a bit you can do it within SM3 as well (with UNORM textures)[08:19:11] <Textmode> glYoda: my requirements are very minimal, though. stippling is probably the most "advanced" thing I actually need.[08:19:56] <glYoda> in both cases the fragment shader is roughly 3 to 4 lines of text :P[08:20:39] <glYoda> well polygon stipple is pretty trivial to implement[08:21:12] *** fille has joined ##OpenGL[08:21:43] <glYoda> and (IMHO) it's trivial enough to expose directly under current API without ever having to go into a compatibility profile OR earlier than GL 3.x core[08:24:29] <Textmode> (pity the current API isn't itself trivial.)[08:25:03] <glYoda> sure it is[08:27:02] *** Twinklebear has quit IRC[08:30:25] *** TyrfingMjolnir has joined ##OpenGL[08:32:40] *** PhyloGenesis has joined ##OpenGL[08:33:58] *** damir__ has joined ##OpenGL[08:36:49] *** Waynes has joined ##OpenGL[08:38:09] *** Keniyal has joined ##OpenGL[08:47:55] *** BreadProduct has quit IRC[08:49:49] *** ValicekB has quit IRC[08:50:35] *** doev has joined ##OpenGL[08:50:51] *** Slion has joined ##OpenGL[08:51:05] *** Garner has joined ##OpenGL[08:51:28] *** Beetny has joined ##OpenGL[08:53:17] *** ValicekB has joined ##OpenGL[08:53:33] *** Sirolf has joined ##OpenGL[08:57:05] *** telex has quit 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##OpenGL[09:38:20] *** ClarusCogitatio has quit IRC[09:39:17] *** ClarusCogitatio has joined ##OpenGL[09:43:12] *** PasNox has joined ##OpenGL[09:53:37] *** Folkol has quit IRC[09:54:15] *** Folkol has joined ##OpenGL[09:58:55] *** adsc has joined ##OpenGL[09:59:37] *** Madsy has quit IRC[10:04:47] *** Domx has joined ##OpenGL[10:06:57] *** redeemed has joined ##OpenGL[10:07:19] *** Dom__ has quit IRC[10:07:48] *** ByronJohnson has quit IRC[10:09:44] *** ByronJohnson has joined ##OpenGL[10:09:53] *** Dom__ has joined ##OpenGL[10:12:22] *** Domx has quit IRC[10:13:24] *** Shogun has quit IRC[10:13:27] <neure> http://lunarg.com/little-chicken-bit-story-big-performance-gain-intels-mesa-driver/[10:13:45] <neure> wtf horrible font[10:14:37] *** Shogun has joined ##OpenGL[10:14:40] <Bloodust> looks good to me[10:15:01] *** ClarusCogitatio has quit IRC[10:16:05] <neure> way too bold[10:16:34] *** centrinia has quit IRC[10:18:48] *** ClarusCogitatio has joined ##OpenGL[10:19:16] <ClaudiusMaximus> light grey on white is more of a readability problem than anything else[10:20:09] <adsc> it looks okay on my screen, although a bit bold[10:21:54] <neure> "a bit" is a bit too much for me[10:22:20] <Bloodust> I really dont see any problems here, the text looks fine to me[10:24:08] <neure> does yours look different from this: http://i.imgur.com/q9GoIfE.png ?[10:25:16] <slime> neure: looks like this to me http://i.imgur.com/XvHOcCb.png[10:25:17] <Bloodust> yes[10:25:19] <Bloodust> very[10:25:30] <neure> ok[10:25:34] <neure> that is much better[10:25:43] <neure> which browser?[10:25:50] <Bloodust> mine's a bit bolder than slime's[10:26:00] <slime> neure: safari in OSX[10:26:52] <Bloodust> mine on firefox on windows 8 http://i.imgur.com/tjzTbw9.png[10:28:41] *** erhan_ has joined ##OpenGL[10:29:46] <neure> i suppose they have chosen some non-standard font and each browser does their own, different guess of what would be best replacement..[10:30:00] <neure> one of them might even get it right[10:30:22] <neure> Looks like IE on windows results good page, Chrome sucks[10:30:59] <ClaudiusMaximus> looks like this on iceweasel on debian http://mathr.co.uk/tmp/lunarg.png[10:31:31] <neure> that looks almost too thin font for my liking[10:31:58] <neure> text color being lightish gray does not help at all..[10:32:25] *** doomlord_1 has joined ##OpenGL[10:32:56] <ClaudiusMaximus> 4 screenshots of 1 webpage all looking different, fun times to be a webdev i guess..[10:38:00] *** viggo has joined ##OpenGL[10:40:40] *** viggo2 has quit IRC[10:44:09] *** TheTeapot has quit IRC[10:46:28] *** HaltingState has quit IRC[10:52:14] *** __zoot__ has joined ##OpenGL[10:52:32] *** kuldeepdhaka_ has joined ##OpenGL[10:56:04] *** kuldeepdhaka has quit IRC[11:00:15] *** clincher has quit IRC[11:00:29] *** JoshSyn has joined ##OpenGL[11:01:31] *** clincher has joined ##OpenGL[11:09:28] *** __zoot__ has quit IRC[11:18:28] *** HaltingState has joined ##OpenGL[11:20:42] *** Burga 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damir__ has joined ##OpenGL[12:12:36] *** urraka has joined ##OpenGL[12:14:04] *** snakenerd has quit IRC[12:15:58] *** Crehl has quit IRC[12:16:37] *** Guest12806 is now known as krs[12:19:32] *** JoshSyn has joined ##OpenGL[12:22:24] *** karab44 has joined ##OpenGL[12:25:32] *** BitPuffin has joined ##OpenGL[12:28:22] *** JoshSyn has quit IRC[12:29:28] *** PhyloGenesis has quit IRC[12:34:20] *** PasNox has quit IRC[12:34:46] *** PasNox has joined ##OpenGL[12:35:46] *** james4k has joined ##OpenGL[12:40:11] *** james4k has quit IRC[12:42:43] *** aethersis has joined ##OpenGL[12:44:54] *** doev has quit IRC[12:45:56] *** fmardini has quit IRC[12:47:23] *** manny- has quit IRC[12:48:49] *** ClarusCogitatio has quit IRC[12:50:25] *** Jack__ has joined ##OpenGL[12:50:31] *** ClarusCogitatio has joined ##OpenGL[12:51:55] *** charlie5 has quit IRC[12:53:10] *** Beetny has quit IRC[12:55:20] *** Textmode has quit IRC[12:56:57] *** DMJC-M has joined ##OpenGL[12:57:46] <DMJC-M> before I jump into reading all the links at the top, do they contain a good porting guide for migrating GL1 code to GL3/4?[12:58:03] <mathias__> No.[12:58:07] <DMJC-M> I've got a bunch of Legacy glbegin/glend code I want to move to array objects[12:58:36] <DMJC-M> is there any resource anywhere that clearly/easily describes howto migrate?[13:01:19] <Bloodust> nope but its not that complicated[13:02:03] <DMJC-M> well it is and it isn't heh[13:02:19] <DMJC-M> but I mainly just need to stop being lazy about using arrays[13:02:50] <chrisf> difficulty will depend on how tangled up your begin/end code is[13:03:09] *** Jack__ has quit IRC[13:04:03] <DMJC-M> mg2modeller.sf.net if you want to have a look at how screwed/not screwed I am[13:06:05] *** paperManu has joined ##OpenGL[13:06:10] <Bloodust> too long[13:06:47] <DMJC-M> I figured[13:06:50] *** charlie5 has joined ##OpenGL[13:07:02] <chrisf> doesnt look too bad so far[13:12:26] *** fmardini has joined ##OpenGL[13:13:12] *** Ad1_RN has joined ##OpenGL[13:14:58] *** dshwang has quit IRC[13:15:53] *** pazul has quit IRC[13:16:17] *** paul424 has joined ##OpenGL[13:16:30] *** kuldeepdhaka_ is now known as kuldeepdhaka[13:17:08] *** Ad1_RnR has quit IRC[13:23:05] *** Ryp has joined ##OpenGL[13:25:19] *** xissburg has joined ##OpenGL[13:26:29] *** erhan_ has joined ##OpenGL[13:27:02] *** fmardini has quit IRC[13:28:23] <paul424> Mathematically, texture filtering is a type of anti-aliasing (AA), but it filters out high frequencies from the texture fill whereas other AA techniques generally focus on visual edges.[13:28:50] <paul424> What's the "frequency" in that context ? ( I am not native ) ?[13:31:14] *** BitPuffin has quit IRC[13:31:18] *** manny- has joined ##OpenGL[13:32:22] <Hunts> paul424: frequency components of the decomposition of the data[13:32:24] <Hunts> like, fourier transform[13:32:37] <paul424> aha :\[13:32:41] <paul424> must read about it[13:32:57] *** ManDay has joined ##OpenGL[13:32:59] *** Kane has joined ##OpenGL[13:35:02] <aethersis> paul424 what do you have problem with[13:35:22] <paul424> wikipedia[13:35:29] <aethersis> xD you don't understand fourier transform?[13:35:34] <paul424> :) http://en.wikipedia.org/wiki/Anisotropic_filtering[13:35:44] <paul424> aethersis: naah never had to do with it[13:36:01] <aethersis> how old are you or are you familiar with academic level calculus?[13:36:12] <paul424> 402[13:36:14] <paul424> 42[13:36:54] <paul424> naah joking , I took the some calculus course but ... ;)[13:36:56] <aethersis> alright so the theory is that every continuous signal can be decomposed into a finite or infinite sum of sines and cosines with different frequencies and amplitudes[13:37:06] *** charlie5 has quit IRC[13:37:21] <paul424> aha , what does it have with bi, tri and anisotropic filtering ?[13:37:25] *** wiky has joined ##OpenGL[13:37:44] <aethersis> so after doing the fourier transform on some continuous signal, you get the output as a sum of sines and cosines and when you sum them up, you obtain the signal back[13:37:49] <aethersis> it[13:38:23] <aethersis> it's easy to imagine in 2d, however this applies to ANY dimension and not even only to euclidean space[13:38:40] <aethersis> wait I meant 1d[13:38:45] <aethersis> so you can also do the trick in 2d and 3d[13:38:53] <paul424> aha , what does it have with bi, tri and anisotropic filtering ?[13:39:06] *** RyanPridgeon has joined ##OpenGL[13:39:12] <aethersis> I thought you were talking about antialiasing[13:39:27] <paul424> They ain't done by fourier transform ...[13:39:54] <paul424> heh that would be an excelent filter though :P[13:39:56] <aethersis> but they change frequency spectrum of the signal[13:40:26] <aethersis> i.e. low pass filter would blur an image or cut off higher frequency in audio signal[13:40:32] <paul424> first each picture would have to be of the finest quality fourier image[13:40:38] <aethersis> and highpass would sharpen image and remove lower frequencies[13:41:32] <aethersis> the most dumbass way to do any kind of filtering would be to decompose the signal into the fourier series and simply remove the harmonics you wish to remove from the series[13:41:37] *** jdolan has joined ##OpenGL[13:41:46] <aethersis> but it would be incredibely slow[13:42:00] *** snakenerd has joined ##OpenGL[13:42:18] <aethersis> actually you don't need to know about FFT to implement any of this. It's just good to know what filters actually are and that an image is also a signal with its harmonics pretty much like a sound wave[13:43:15] <aethersis> I can't help you with anisotropic filtering though.. Never done it[13:43:24] <paul424> naah ok[13:43:26] <aethersis> and I'm ill and unable to think xD[13:43:45] *** mockillo has quit IRC[13:46:34] <paul424> http://www.arcsynthesis.org/gltut/Texturing/Tut15%20Anisotropy.html ahh finally[13:47:36] *** samrat has quit IRC[13:48:04] *** mockillo has joined ##OpenGL[13:50:41] *** charlie5 has joined ##OpenGL[13:50:42] *** aethersis has quit IRC[13:52:17] *** aethersis has joined ##OpenGL[13:53:50] *** shintahW2 has joined ##OpenGL[13:56:58] *** shintahW has quit IRC[13:56:58] *** shintahW2 is now known as shintahW[13:59:17] *** paul424 has quit IRC[14:00:21] *** paperManu has quit IRC[14:04:41] *** zoraj has quit IRC[14:16:39] *** jdolan has quit IRC[14:17:41] *** dshwang has joined ##OpenGL[14:19:09] *** razieliyo has joined ##OpenGL[14:19:09] *** razieliyo has joined ##OpenGL[14:21:32] *** tehrain has joined ##OpenGL[14:21:38] *** DMJC-M has quit IRC[14:22:25] *** DrSkyLizard has joined ##OpenGL[14:23:27] *** erhan_ has quit IRC[14:33:03] *** paperManu has joined ##OpenGL[14:33:43] *** adsc has quit IRC[14:35:33] *** jdolan has joined ##OpenGL[14:35:57] *** Demon_Fox has joined ##OpenGL[14:38:25] *** Ryp1 has joined ##OpenGL[14:38:44] *** paperManu has quit IRC[14:40:24] *** jdolan has quit IRC[14:41:53] *** Ryp has quit IRC[14:49:00] *** Zupo2 has joined ##OpenGL[14:49:20] *** fille has quit IRC[14:51:08] *** paperManu has joined ##OpenGL[14:52:46] *** ManDay has quit IRC[14:52:54] *** kuldeepdhaka has quit IRC[14:59:12] *** samrat has joined ##OpenGL[14:59:53] *** Ryp1 has quit IRC[15:00:22] *** erhan_ has joined ##OpenGL[15:08:48] *** Dark_Confidant has joined ##OpenGL[15:09:21] *** kuldeepdhaka has joined ##OpenGL[15:12:16] *** Madsy has joined ##OpenGL[15:12:16] *** Madsy has joined ##OpenGL[15:12:20] *** Match has joined ##OpenGL[15:12:30] *** Dark_Confidant|m has quit IRC[15:13:17] *** Ryp has joined ##OpenGL[15:14:27] *** dav1d has joined ##OpenGL[15:17:40] <dav1d> I am currently trying to get rid of the glad_ prefix of function pointers (e.g. https://github.com/Dav1dde/glad/blob/c/include/glad/glad.h#L3525-L3527 - big file!) but this breaks code in other places e.g. glut http://vp.dav1d.de/EovY?c - I think I ran into this problem already, that's why I did that workaround, but I can't remember the reason why it breaks. Can anyone explain that to me? Also is there a way to not use this define stuff, but yet have it wo[15:18:07] <dav1d> Yaniel: ^[15:22:19] <Bloodust> cut after "have it wo"[15:22:31] <Bloodust> why are you trying to get rid of the prefix?[15:25:03] <dav1d> Bloodust: https://github.com/Dav1dde/glad/issues/11[15:25:18] <BtbN> It's designed like that for a reason. It avoids collisions with OS OpenGL libraries that might already define that symbol.[15:25:37] <dav1d> last bit: "Also is there a way to not use this define stuff, but yet have it work? ;)"[15:25:40] <BtbN> Having an actual symbol with the name of an OpenGL Symbol is likely to cause errors.[15:25:42] <Bloodust> riiight[15:26:07] <BtbN> Might maybe work on Windows, but will cause issues on Linux and OSX.[15:26:12] <BtbN> And propably everywhere else[15:26:19] <dav1d> I see, psuedo mangling with glad_ prefix[15:26:40] <dav1d> I guess that makes sense, I use not enough C to think of that ... thanks[15:26:43] <dav1d> mh[15:27:09] <BtbN> What is the actual issue you want to fix?[15:27:49] <dav1d> BtbN: there is no real issue (no bug), https://github.com/Dav1dde/glad/issues/11[15:28:03] <dav1d> completion for IDEs is fucked up because of that macro workaround[15:29:02] <BtbN> btw., i'm the one who PR'd that huge C cleanup. Report a bug to the IDEs then i'd say.[15:29:25] <BtbN> For C++ and modern C there'd be an alternative, as it supports inline functions[15:29:41] <dav1d> BtbN: yeah I remember your name :)[15:30:10] <BtbN> In QtCreator the macros work as expected for me.[15:30:26] <dav1d> BtbN: what do you think of #ifdef GL_GLEXT_PROTOTYPES[15:30:33] <dav1d> BtbN: ohhh[15:30:50] <dav1d> yeah, I was actually expecting an IDE to expand the macro (pretty sure kdevelop does that)[15:34:06] <BtbN> Issue #11 is actualy a bug in QtCreator[15:34:33] <BtbN> No idea which version he's using, but in the current git version i'm using it works fine.[15:34:37] <dav1d> BtbN: wanna do me a favor and answer the commit?[15:34:44] *** xissburg has quit IRC[15:34:45] <dav1d> eh[15:34:47] <dav1d> issue not commit[15:34:50] <BtbN> sure[15:34:56] <dav1d> tyvm[15:35:46] *** HunterD has joined ##OpenGL[15:36:58] *** xissburg has joined ##OpenGL[15:39:16] *** hexagoxel has joined ##OpenGL[15:40:17] *** maxton has quit IRC[15:43:05] *** Ryp has quit IRC[15:43:59] *** maxton has joined ##OpenGL[15:45:59] *** jdolan has joined ##OpenGL[15:46:01] *** adsc has joined ##OpenGL[15:48:56] *** FrodoTheHobbit has quit IRC[15:49:04] *** FrodoTheHobbit has joined ##OpenGL[15:54:15] *** MLM has joined ##OpenGL[15:55:03] *** wiky has quit IRC[15:56:31] *** charlie5 has quit IRC[15:58:41] *** doev has joined ##OpenGL[16:01:43] *** Gamecubic has joined ##OpenGL[16:01:43] *** Ryp has joined ##OpenGL[16:03:16] *** zajfy has joined ##OpenGL[16:04:10] *** bkc_ has quit IRC[16:04:24] *** doev has quit IRC[16:05:01] *** bkc_ has joined ##OpenGL[16:09:21] *** bkc_ has quit IRC[16:10:07] *** bkc_ has joined ##OpenGL[16:13:30] *** karab44 has quit IRC[16:15:37] *** Zeioth has joined ##OpenGL[16:16:05] *** damir__ has quit IRC[16:17:54] *** Ryp has quit IRC[16:18:31] *** BitPuffin has joined ##OpenGL[16:19:58] *** BitPuffin has quit IRC[16:20:52] *** TyrfingMjolnir has quit IRC[16:23:45] *** Ryp has joined ##OpenGL[16:24:40] *** TyrfingMjolnir has joined ##OpenGL[16:26:33] *** TyrfingMjolnir has quit IRC[16:26:58] *** TyrfingMjolnir has joined ##OpenGL[16:28:20] *** nimitz has joined ##OpenGL[16:28:49] <nimitz> should you be modelling specular terms when dealing with light bounces on somewhat rough materials?[16:30:50] *** kuldeepdhaka has quit IRC[16:31:01] *** DrSkyLizard has quit IRC[16:31:13] *** staylor has joined ##OpenGL[16:31:25] <roboman2444> nimitz, everything has specular[16:31:39] <roboman2444> one of the main points behind PBR[16:34:27] *** TyrfingMjolnir has quit IRC[16:35:15] <nimitz> so backlighting is treated as another light?[16:35:21] <nimitz> (assuming no GI)[16:37:26] *** doboo has joined ##OpenGL[16:38:07] <doboo> I know it's not related to opengl, but anyone of you has any experience in text shaping for font rendering? using harfbuzz for example[16:38:15] *** BitPuffin has joined ##OpenGL[16:41:28] *** Orion] has joined ##OpenGL[16:47:36] *** Kane has quit IRC[16:51:57] *** 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joined ##OpenGL[18:32:38] *** konom_ has quit IRC[18:32:44] *** konom__ has quit IRC[18:34:13] <aethersis> hi[18:34:25] <aethersis> I need the fastest possible numerical method for solving matrix equation of type Ax=B[18:35:18] <aethersis> SOR works about 3x faster than Jacobi but still if the matrix A is N*N, it needs 3xN iterations to solve it correctly[18:35:23] <aethersis> jacobi needs 10xN[18:35:31] *** erhan_ has quit IRC[18:35:40] *** newguise1234 has quit IRC[18:35:43] <roboman2444> not exactly an opengl question...[18:36:13] <aethersis> yeah but perhaps someone know[18:36:14] <aethersis> s[18:36:30] <roboman2444> true[18:38:54] <aethersis> actually it's not exactly Ax=B what I want is solving poisson differential equation but it comes down to the form Ax=B[18:40:48] <aethersis> yet another thing I realized is that the bottleneck of such the algorithms is not mathematical complexity but memory efficiency[18:41:02] <aethersis> complex maths is cheaper than extensive memory usage[18:41:13] <aethersis> it basically computes faster (to some extent of course)[18:44:55] *** adsc has quit IRC[18:49:12] *** Misu has joined ##OpenGL[18:52:33] *** Josh|SYN has quit IRC[18:52:46] *** stefkos has joined ##OpenGL[18:56:26] *** razieliyo_ has joined ##OpenGL[18:58:32] *** BitPuffin has quit IRC[18:59:57] *** razieliyo has quit IRC[19:04:54] *** newguise1234 has joined ##OpenGL[19:06:51] *** Khlorghaal has joined ##OpenGL[19:09:32] *** Ryp1 has joined ##OpenGL[19:10:05] *** Ryp has quit IRC[19:12:25] *** RyanPridgeon has joined ##OpenGL[19:15:10] *** Lucretia has quit IRC[19:15:13] *** Match has quit IRC[19:17:49] *** vegard1992 has joined ##OpenGL[19:17:51] <vegard1992> hey guys[19:18:34] *** Lucretia has joined ##OpenGL[19:24:47] <Bloodust> hey you[19:25:52] *** japro has joined ##OpenGL[19:26:32] <vegard1992> will u guys help me with openAL[19:26:34] <vegard1992> in python[19:26:40] <vegard1992> the dudes over at #openal are being real quiet[19:26:53] *** hexagoxel has quit IRC[19:26:57] <vegard1992> i dunno if the two are related or wat[19:28:58] *** PortaLu has joined ##OpenGL[19:28:59] *** Leates is now known as Guest31843[19:29:20] <roboman2444> vegard1992, openal is very different from opengl[19:29:32] <roboman2444> i dont think you will find much help in this channel[19:29:40] <roboman2444> maybe ask in #gamedev or something[19:29:41] <vegard1992> awh[19:29:49] <vegard1992> theres a channel for that? :D[19:29:59] <vegard1992> wow[19:30:01] <vegard1992> theres a lot of ppl[19:30:06] <vegard1992> ^_^[19:31:07] *** Lucretia has quit IRC[19:31:29] *** ShadowIce has joined ##OpenGL[19:31:30] <roboman2444> also i think most openGL programmers do stuff in C or c++, so asking python questions in here probably wont result in much either[19:31:46] <vegard1992> well[19:31:54] <vegard1992> u guys helped me out a lot![19:31:56] <vegard1992> :)[19:32:04] <vegard1992> its pretty similar[19:32:07] *** foreignFunction has joined ##OpenGL[19:32:15] <vegard1992> shaders are in C[19:32:58] <phillip_w> GLSL isnt C is it?[19:33:02] <phillip_w> its just remarkably similar[19:33:03] <tehrain> they look like C but they're not[19:33:22] <vegard1992> well[19:33:29] <vegard1992> i just say all that stuff is C[19:33:31] <aethersis> phillip_w, it's not C at all, it just has similar syntax[19:33:34] <vegard1992> like kernels, shaders[19:34:01] <aethersis> and it also enforces a different way of thinking about code[19:34:29] <aethersis> thinking about it as about C code can be helpful for the beginning but then you will be lost xD[19:34:41] <vegard1992> ok what should i say[19:35:29] <slime> the language for opengl's shaders is called GLSL[19:37:05] *** Ryp1 has quit IRC[19:37:17] *** Crehl has joined ##OpenGL[19:37:37] *** ttvdsfx has quit IRC[19:37:40] <phillip_w> okay[19:38:27] *** shingshang has quit IRC[19:39:14] *** HunterD has joined ##OpenGL[19:39:32] <roboman2444> glsl has a similar syntax to C[19:39:34] <roboman2444> very 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joined ##OpenGL[20:11:23] *** meoblast001 has joined ##OpenGL[20:11:35] *** BreadProduct has quit IRC[20:11:42] *** BreadProduct_ is now known as BreadProduct[20:12:33] *** Keniyal has joined ##OpenGL[20:13:28] *** xissburg has quit IRC[20:17:49] *** clauswitt has quit IRC[20:25:27] *** damir__ has quit IRC[20:29:03] *** katlogic_ is now known as katlogic[20:32:27] *** RyanPridgeon_ has quit IRC[20:32:56] *** RyanPridgeon has joined ##OpenGL[20:36:55] *** vegard1992 has quit IRC[20:37:26] *** konom has joined ##OpenGL[20:42:07] *** aethersis has quit IRC[20:42:51] *** gaganjyot has quit IRC[20:44:28] *** paul424 has joined ##OpenGL[20:56:46] *** cr`nge has quit IRC[20:57:46] *** HOS_cr`nge has joined ##OpenGL[21:04:28] *** hexagoxel has joined ##OpenGL[21:07:54] *** anivemin has joined ##OpenGL[21:09:02] *** karab44 has joined ##OpenGL[21:11:11] *** katlogic has quit IRC[21:11:32] *** meoblast001 has quit IRC[21:11:47] *** katlogic_ has joined ##OpenGL[21:14:24] *** japro has quit IRC[21:16:05] *** ttvdsfx has joined ##OpenGL[21:16:51] *** samrat has quit IRC[21:16:56] *** Slion has joined ##OpenGL[21:18:37] *** PasNox__ has quit IRC[21:24:53] *** DMJC-M has quit IRC[21:25:53] *** BitPuffin has joined ##OpenGL[21:28:13] *** HOS_cr`nge has quit IRC[21:28:25] *** bjz has quit IRC[21:30:02] *** losh has joined ##OpenGL[21:30:30] *** HOS_cr`nge has joined ##OpenGL[21:34:31] *** groton has joined ##OpenGL[21:35:59] *** bjz has joined ##OpenGL[21:41:54] *** Ryp has quit IRC[21:43:02] *** RyanPridgeon_ has joined ##OpenGL[21:43:11] *** Garner has quit IRC[21:46:03] *** RyanPridgeon has quit IRC[21:49:02] *** RyanPridgeon has joined ##OpenGL[21:50:08] *** RyanPridgeon_ has quit IRC[21:50:23] *** bjz has quit IRC[21:51:00] *** bjz has joined ##OpenGL[21:52:13] *** karab44 has quit IRC[21:52:18] <nimitz> anyone implemented disney's shading model here?[21:53:07] <Bloodust> whatsthat[21:53:15] <nimitz> http://disney-animation.s3.amazonaws.com/library/s2012_pbs_disney_brdf_notes_v2.pdf[21:53:36] <nimitz> i'm using their diffuse model but they seem to be omitting the lambertian contribution[21:53:53] <nimitz> and if i just multiply by n.l i get a very dark diffuse[21:54:08] <nimitz> multiplying by PI seems to "fix" it, but it's not mentionned anywhere in the paper[21:55:39] *** bjz has quit IRC[21:56:23] *** Ryp has joined ##OpenGL[21:59:46] *** Slion has quit IRC[22:01:30] *** Garner has joined ##OpenGL[22:07:40] *** _leb has joined ##OpenGL[22:10:37] *** snakenerd has quit IRC[22:11:39] *** Ryp1 has joined ##OpenGL[22:15:26] *** centrinia has joined ##OpenGL[22:16:05] *** Ryp has quit IRC[22:19:31] *** losh has quit IRC[22:20:27] *** cp has joined ##OpenGL[22:20:30] *** Ryp1 has quit IRC[22:25:31] *** foreignFunction has quit IRC[22:27:58] *** tehrain has quit IRC[22:32:45] *** hdon has quit IRC[22:34:46] *** Demon_Fox has joined ##OpenGL[22:36:10] *** cp has left ##OpenGL[22:37:27] *** Waynes has quit IRC[22:41:35] *** jdolan has quit IRC[22:42:29] *** Demon_Fox has quit IRC[22:43:27] *** BitPuffin has quit IRC[22:48:11] *** BitPuffin has joined ##OpenGL[22:48:44] *** anivemin has quit IRC[22:53:36] *** qeed has joined ##OpenGL[22:53:37] *** japro has joined ##OpenGL[22:54:23] *** groton has quit IRC[23:00:38] *** metredigm has joined ##OpenGL[23:01:52] *** iKlsR has joined ##OpenGL[23:02:54] *** slidercrank has joined ##OpenGL[23:06:42] *** stefkos has quit IRC[23:07:59] *** sreich has quit IRC[23:08:09] *** japro has quit IRC[23:09:14] *** Lemml has quit IRC[23:13:46] *** telex has quit IRC[23:13:54] *** FrodoTheHobbit has quit IRC[23:14:46] *** telex has joined ##OpenGL[23:23:41] *** iKlsR has quit IRC[23:25:12] *** mockillo has quit IRC[23:25:26] *** icedev has joined ##OpenGL[23:25:54] *** TunnelCat has joined ##OpenGL[23:26:47] *** FrodoTheHobbit has joined ##OpenGL[23:28:46] *** sreich has joined ##OpenGL[23:29:47] *** mockillo has joined ##OpenGL[23:32:12] *** seaworthy has joined ##OpenGL[23:32:44] *** unreal has quit IRC[23:32:54] *** HunterD has quit IRC[23:33:34] *** tcsc has joined ##OpenGL[23:39:36] <nimitz> anyone implemented PBR here? i'm looking for a way to attenuate specG at high grazing[23:40:20] <roboman2444> pabst[23:40:30] <roboman2444> also Fresnel[23:40:52] *** sreich has joined ##OpenGL[23:43:51] <nimitz> pabst?[23:44:04] *** Khlorghaal has quit IRC[23:44:28] *** sreich has quit IRC[23:45:35] *** sreich has joined ##OpenGL[23:45:51] *** unreal has joined ##OpenGL[23:47:29] <roboman2444> google it[23:48:26] <nimitz> ...[23:48:47] <nimitz> "Pabst Brewing Company"[23:48:48] *** Ad1 has quit IRC[23:50:02] *** RyanPridgeon_ has joined ##OpenGL[23:50:35] <roboman2444> pabst blue ribbon[23:50:38] <roboman2444> pbr[23:52:10] <derhass> lol[23:53:06] *** RyanPridgeon has quit IRC[23:53:50] *** RyanPridgeon has joined ##OpenGL[23:54:22] *** RyanPridgeon_ has quit IRC[23:56:14] *** RyanPridgeon has quit IRC