March 17, 2019 
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ZZZzzz…)[19:53:56] *** slidercrank <slidercrank!~slidercra@ircpuzzles/2015/april-fools/fifth/slidercrank> has joined ##OpenGL[20:05:26] *** thomas_25 <thomas_25!~thomas_25@unaffiliated/thomas-25/x-0068438> has joined ##OpenGL[20:06:48] *** davr0s <davr0s!~textual@host109-150-28-226.range109-150.btcentralplus.com> has joined ##OpenGL[20:09:53] *** snyp <snyp!~Snyp@1.39.138.102> has quit IRC (Quit: WeeChat 2.4)[20:10:36] *** serg-z <serg-z!~serg-z@87.247.62.56> has joined ##OpenGL[20:27:44] *** groton <groton!~groton@unaffiliated/groton> has joined ##OpenGL[20:35:27] <zy]x[yz> there's a cube directly in front of the camera ({x,y,z} = {0, 0, -1.5}). you rotate the camera 30 degrees about the y-axis. you expect the camera to move toward the right side of the screen or the left side of the screen?[20:35:43] <zy]x[yz> s/expect the camera/expect the cube/[20:37:06] <Stragus> Left? Just remember that in 3D graphics, you rotate the entire world around a fixed camera at the origin[20:37:33] <zy]x[yz> yes, what i'm confused about at the moment is the direction of rotation[20:38:16] <zy]x[yz> i feel like there should be a negation in my arithmetic (because of that moving-the-world-around-the-camera thing you mention), but i get the results i expect without it[20:39:01] <derhass> well, if you rotate the camera, than you rotate the camera[20:40:48] <zy]x[yz> let me ask again to take the camera element out of it: you draw a cube at position {0, 0, -1.5} so that it lands in front of the camera which is at {0, 0, 0}. you rotate the cube 30 degrees about the positive z axis. do you expect the cube to turn clockwise or counter-clockwise?[20:40:49] <derhass> and, actually, assuming usual GL conventions, I'd expect the cube to move to the right[20:41:04] <zy]x[yz> i also thought it should move to the right[20:41:58] <Stragus> Oops, you are both right there[20:42:19] <derhass> zy]x[yz: counter-clockwise[20:42:32] <zy]x[yz> thanks, that's what i thought[20:44:29] <derhass> if you just imagine the infinite cycle xyz->xyz->xyz, you can just look at the next two elements after the axis you're rotating around (no matter the handedness of the space)[20:44:43] <derhass> so positive rotation around x axis means it moves y towards z[20:45:05] <derhass> positive rotation around y axis means it moves z towards x, and z moves x towards y[20:45:22] <zy]x[yz> oh cool, that's a good way to remember it. thanks[20:57:52] *** immibis <immibis!~immibis@125-238-72-168-fibre.sparkbb.co.nz> has joined ##OpenGL[21:08:12] *** marcheu <marcheu!~marcheu@annarchy.freedesktop.org> has joined ##OpenGL[21:09:25] *** borkr <borkr!~borkr@static130-244.mimer.net> has joined ##OpenGL[21:19:22] *** krystcich <krystcich!~krystcich@088156132170.dynamic-ww-04.vectranet.pl> has joined ##OpenGL[21:20:45] *** zalt <zalt!~lambda443@unaffiliated/lambda443> has joined ##OpenGL[21:22:07] <zalt> hello, i have very simple vertex and fragment shaders with "#version 330"[21:22:40] <zalt> i'm trying to use them as they are for GLES 2, what #version string do i need?[21:24:11] <zalt> oops, i can't use them as they are :P ERROR: 0:3: 'in' : storage qualifier supported in GLSL ES 3.00 only[21:24:27] <zalt> i guess i can transliterate them, but i don't know what #version am i supposed to use[21:24:38] <derhass> #version 300 es[21:25:19] <zalt> i found this: https://en.wikipedia.org/wiki/OpenGL_Shading_Language[21:25:42] <zalt> i'm trying to use them in a GLES 2.0 version, i guess this means #version 100 es?[21:25:45] *** dexter0 <dexter0!~dexter0@c-73-222-1-210.hsd1.ca.comcast.net> has quit IRC (Quit: exit)[21:25:59] <zalt> and should i even bother with GLES 2.0?[21:26:11] <derhass> yeah, es2 is #version 100 es[21:26:18] <derhass> and no, you should not[21:26:38] <zalt> do most modern phones support gles 3.0? :O[21:26:54] <derhass> I don't know[21:27:14] <derhass> but _I_ don't support GLES2 any more[21:27:24] <zalt> lol, i hate trying to be backwards compatible[21:27:29] <derhass> it has become just too depressing[21:27:58] *** immibis <immibis!~immibis@125-238-72-168-fibre.sparkbb.co.nz> has quit IRC (Ping timeout: 245 seconds)[21:28:14] <Stragus> Not my field, but as far as I know, you need pretty old hardware to only get GLES 2[21:29:09] <zalt> this is relevant https://developer.android.com/about/dashboards[21:29:48] <zalt> 2.0 is 21%, >= 3.0 is about 79%[21:29:51] <zalt> fuck it[21:29:56] <Stragus> Agreed[21:29:58] <zalt> :P[21:30:50] * zalt recompiles everything for API level 18[21:38:00] *** alexge50 <alexge50!~alexge50@unaffiliated/alexge50> has quit IRC (Ping timeout: 250 seconds)[21:44:43] *** Foaly <Foaly!~Foaly@ppp-88-217-89-103.dynamic.mnet-online.de> has joined ##OpenGL[21:56:41] <zalt> ummm, texture2D no longer exists?[21:57:07] <derhass> welcome in 2008[21:57:44] <zalt> lol[21:58:11] * zalt wants to outsource this task so he gets to see something on the screen[21:59:03] <zalt> https://pastebin.com/xsnhuGUw[21:59:44] <zalt> i feel like 90% of shaders in existence do exactly the same thing[22:00:53] <derhass> the in ivec4 a_col thing looks a bit suspicous[22:01:29] <derhass> apart from that, it is pretty standard[22:01:57] <zalt> so it should work with glsl 3.0 es?[22:02:02] <derhass> no[22:02:05] <zalt> lol[22:02:12] <zalt> what do i need to change :([22:02:14] <derhass> texture2D doesn't exist there[22:02:29] <derhass> it is called just texture() sind GLSL 1.30 (from 2008)[22:02:34] <derhass> *since[22:03:03] * zalt updates his package database[22:05:24] *** hellozee <hellozee!~hellozee@116.73.34.190> has quit IRC (Remote host closed the connection)[22:06:19] <derhass> not sure how that is related...[22:08:25] <zalt> i mean my mental one :P[22:08:32] <zalt> now it says Error: uniform u_mat specified with different precision in different shaders.[22:08:44] <zalt> i guess that's because in one of the shaders i specified precision?[22:08:44] <derhass> right[22:08:52] <derhass> yes[22:08:56] <zalt> i don't even need it in the other one[22:10:10] <zalt> Yay! it worked[22:10:49] <zalt> after a few days of fighting with build systems, cross compilation environments, patching dependencies :D[22:10:57] *** dexter0 <dexter0!~dexter0@c-73-222-1-210.hsd1.ca.comcast.net> has joined ##OpenGL[22:11:09] <derhass> zy]x[yz: still, the question about a_col remains[22:11:23] <derhass> what are you doing there?[22:11:48] <derhass> I get the impression that what you do is not a good idea, but I can't know for sure[22:11:49] <zalt> ummm i don't know, i had to unlearn gles in order to make room for other things[22:12:01] <zalt> i don't know why my intention was[22:12:19] <zalt> i have for each vertex a uint8_t rgba[4];[22:12:29] <derhass> that's what I thought[22:12:31] *** slvn_ <slvn_!~slvn_@c2s31-1-78-245-90-111.fbx.proxad.net> has quit IRC (Remote host closed the connection)[22:12:32] <zalt> i need this to be a value between 0 .. 1.0[22:12:44] <derhass> so there is not the slightest need to use integer attributes[22:12:56] <derhass> that's a total waste[22:13:03] <derhass> exactly as I suspected[22:13:06] <zalt> lol[22:13:17] <derhass> you get that conversion for free[22:13:22] * zalt knows that he doesn't know how to code shaders[22:13:23] <derhass> just use standard float attributes[22:14:27] *** davr0s <davr0s!~textual@host109-150-28-226.range109-150.btcentralplus.com> has quit IRC (Quit: My MacBook Pro has gone to sleep. ZZZzzz…)[22:14:36] <zalt> you mean i shouldn't be using glVertexAttribIPointer?[22:14:43] <zalt> or is that unrelated[22:14:47] <derhass> yes, you should not[22:15:17] <derhass> you should use in vec4 in the VS, and glVertexAttribPPointer? with normalize parameter set to GL_TRUE[22:15:35] <derhass> glVertexAttribPointer[22:16:43] <derhass> and of course remove the stupid division by 255 and conversion from the shader[22:18:02] <zalt> ok, take it easy on me![22:18:09] <zalt> i'm doing this :P[22:25:48] *** darkside86 <darkside86!~ismai@97-81-155-106.dhcp.gwnt.ga.charter.com> has quit IRC (Ping timeout: 246 seconds)[22:29:27] * zalt wonders why is he passing 4 color components even though he's only using 3[22:29:48] <zalt> i think i switched to premultiplied alpha or something[22:35:06] <zalt> hmm, this explains why some things were broken[22:36:04] *** borkr <borkr!~borkr@static130-244.mimer.net> has quit IRC (Ping timeout: 268 seconds)[22:42:15] *** davr0s <davr0s!~textual@host109-150-28-226.range109-150.btcentralplus.com> has joined ##OpenGL[22:43:35] <zalt> derhass, ok everything works, also i fixed a bug in the process, thanks[22:44:26] <zalt> so what's wrong with what i was doing was that i was doing things in a roundabout way that prevents the hardware from optimizing it?[22:50:08] *** zalt <zalt!~lambda443@unaffiliated/lambda443> has quit IRC (Remote host closed the connection)[22:50:11] <derhass> zalt: fixed point UNORM is a default format in GPUs since ages[22:50:21] <derhass> integer attributes are supported only recently at all[22:50:33] <derhass> and you do the conversion manually in the shader[22:50:46] *** zalt <zalt!~lambda443@unaffiliated/lambda443> has joined ##OpenGL[22:50:52] <derhass> that code for examle would never have worked on ES2[22:51:13] <derhass> while the standard flot attribute variant would have[22:51:37] *** zalt <zalt!~lambda443@unaffiliated/lambda443> has quit IRC (Remote host closed the connection)[22:52:18] *** zalt <zalt!~lambda443@unaffiliated/lambda443> has joined ##OpenGL[23:01:27] *** ShadowIce <ShadowIce!~pyoro@unaffiliated/shadowice-x841044> has quit IRC (Quit: Leaving)[23:11:01] *** Foaly <Foaly!~Foaly@ppp-88-217-89-103.dynamic.mnet-online.de> has quit IRC (Quit: Now 'mid shadows deep falls blessed sleep.)[23:24:55] *** thomas_25 <thomas_25!~thomas_25@unaffiliated/thomas-25/x-0068438> has quit IRC (Quit: My MacBook has gone to sleep. 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