| --- Log opened Fri Apr 18 00:00:45 2014 |
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| 04:39 | <@celticminstrel> | My stencil buffer masking thing doesn't work and I have no clue why. |
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| 05:30 | <@celticminstrel> | Hm, it looks like the issue is that the offscreen thing I was drawing to doesn't have a stencil buffer. |
| 05:30 | <@celticminstrel> | The window certainly does though. |
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| 05:38 | <@celticminstrel> | Gasp! It works! Well, sort of, at least. |
| 05:39 | <@celticminstrel> | There's the issue that the parts that are supposed to be transparent are instead white. |
| 05:39 | <@celticminstrel> | I expect I'm using the wrong stencil op/func. |
| 05:42 | <@celticminstrel> | Oh. |
| 05:43 | <@celticminstrel> | Wait, no, that doesn't work. |
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| 06:01 | <@celticminstrel> | So yeah, the stencil buffer is set exactly how I want it, but when I fill the framing rect with solid colour, the bits that are supposed to be masked out are instead filled in with white. |
| 06:02 | <@celticminstrel> | Incidentally, I'm glad I discovered the OpenGL Profiler application. |
| 06:02 | <@Namegduf> | Do you have alpha blending enabled? |
| 06:02 | <@celticminstrel> | Uh. Good question. |
| 06:03 | <@Namegduf> | The thing you're drawing to needs an alpha channel, it needs to be filled with transparent by default, and it needs to be drawn with alpha blending to the screen. |
| 06:03 | <@celticminstrel> | The thing I'm drawing is literally a solid black rectangle. |
| 06:03 | <@celticminstrel> | The screen does have an alpha channel. |
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| 06:04 | <@celticminstrel> | And it appears that I'm using alpha blending when drawing. |
| 06:04 | <@celticminstrel> | Um. Filled with transparent by default? |
| 06:04 | <@celticminstrel> | Like, glClearColor type of thing? |
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| 06:08 | <@celticminstrel> | ...wait. |
| 06:09 | <@celticminstrel> | Maybe it's how I'm setting up the stencil buffer. |
| 06:11 | <@celticminstrel> | Yup. |
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| 06:11 | <@celticminstrel> | While setting up the stencil buffer, I was drawing black shapes to the portion of the window I wanted to include, then white shapes on top of that where I wanted to exclude parts. |
| 06:12 | <@celticminstrel> | I changed it to draw all those shapes transparent, and now it works. |
| 06:15 | <@celticminstrel> | Now I need to figure out how to get a mask from a black-and-white image into the stencil buffer. |
| 06:16 | <@celticminstrel> | Such that black pixels set the stencil to 1 and white pixels set it to 0, and nothing changes onscreen. |
| 06:16 | <@celticminstrel> | Random side note, does 61 textures seem like a lot? |
| 06:29 | <@celticminstrel> | Aaand I just discovered glColorMask, which looks like it would've also solved my problem. |
| 06:30 | <@celticminstrel> | glBlitFramebuffer looks like it might do what I want, maybe. |
| 06:31 | <@celticminstrel> | Except I have no idea whether a texture counts as a framebuffer and suspect it might not. |
| 06:32 | <@Namegduf> | The texture needs an alpha channel. |
| 06:32 | <@Namegduf> | It probably has one, though, assuming you aren't doing anything odd. |
| 06:33 | <@celticminstrel> | It does, yeah. |
| 06:33 | <@celticminstrel> | Some of my textures don't, but the one with the masks does. |
| 06:33 | <@celticminstrel> | Well, the source images don't, at least; the textures might, I suppose. |
| 06:34 | <@Namegduf> | At least one solution, by the way, is to draw with a shader, such that you draw opaque for 1 and transparent for 0. |
| 06:35 | <@Namegduf> | Just let your read from the source texture go into the alpha channel. |
| 06:35 | <@celticminstrel> | Would that be an easy shader to write? |
| 06:35 | <@Namegduf> | Yeah. |
| 06:35 | <@celticminstrel> | Hm. |
| 06:36 | <@Namegduf> | The stencil buffer does its operation when you draw non-transparently on a pixel. |
| 06:36 | <@Namegduf> | As in, anything other than completely transparent. |
| 06:36 | <@celticminstrel> | Uh, actually, it does it when you draw a transparent pixel too, apparently. |
| 06:36 | <@Namegduf> | Hmm, I wonder what the options difference is. |
| 06:36 | <@celticminstrel> | Because I fixed my issue earlier by drawing the shapes transparent, and the stencil still worked. |
| 06:37 | <@Namegduf> | Are you doing non-premultiplied alpha? |
| 06:37 | <@Namegduf> | So you have transparent that isn't transparent black? |
| 06:37 | <@celticminstrel> | I think the transparent is transparent white, but I'm not 100% certain of this. |
| 06:37 | <@Namegduf> | Okay. It is entirely plausible to me that only transparent black is ignored. |
| 06:38 | <@Namegduf> | Since that's all zeros. |
| 06:38 | <@celticminstrel> | I see. |
| 06:38 | <@Namegduf> | I work with premultiplied alpha, so there is no other kind of transparent. |
| 06:38 | <@celticminstrel> | I'll check some stuff. |
| 06:38 | <@Namegduf> | So I think you might want to basically have a shader that draws transparent and inverts the colour. |
| 06:39 | <@Namegduf> | Guessing that that is it. |
| 06:39 | <@celticminstrel> | If it ignores all black, I can change the source image so that the transparent is black. |
| 06:46 | <@celticminstrel> | Oh wait, I don't have a stencil buffer in this context. |
| 06:47 | <@celticminstrel> | Maybe the shader is the better route after all... |
| 06:47 | <@celticminstrel> | Hm. |
| 06:48 | <@celticminstrel> | With a shader, is there some way I could draw first the mask, then the image to be masked, and combine them somehow? |
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| 06:54 | <@celticminstrel> | Oh wow, I found someone trying to do almost exactly the same thing as me, even with the same library. |
| 06:54 | <@celticminstrel> | ...maybe not quite exactly the same, but at least similar in the important aspect. |
| 06:56 | <@celticminstrel> | ...wait, in what version were shaders added? |
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| 07:18 | <@celticminstrel> | Okay, EXC_BAD_ACCESS in the stream libraries now. Sigh. |
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| 07:28 | <@celticminstrel> | And it works if I load it in my own code instead of letting the library load it. Yay. |
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| 07:29 | <@celticminstrel> | Finding the size of a file via fin.seekg(0, std::ios::end)! |
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| 07:32 | <@celticminstrel> | Why am I still naming variables with a _gworld prefix when I'm not even using Carbon? |
| 07:32 | <@celticminstrel> | (Or _gw) |
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| 08:15 | <&McMartin> | Part 2 complete: https://hkn.eecs.berkeley.edu/~mcmartin/retro/colorchart2.html |
| 08:15 | <&McMartin> | And now bed |
| 08:17 | <@celticminstrel> | The shader works in the Shader Builder utility but not in my program. |
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| 08:58 | <@celticminstrel> | I assume I'm just using it wrong or something, but I'll figure this out tomorrow. |
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| 09:43 | < Xon> | http://opensslrampage.org/ <- rofl |
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| 12:37 | <@AnnoDomini> | What's VMS and why is it terrible? |
| 12:38 | < Xon> | AnnoDomini, http://opensslrampage.org/post/82974555807/spray-the-apps-directory-with-anti-vm s-napalm-so <- apparently it leads to brain damage like this |
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| 12:57 | <@Tamber> | VAX/VMS, presumably |
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| 13:50 | <@Tarinaky> | It's a good thing online commerce isn't a serious application of the internet worth billions. |
| 13:50 | <@Tarinaky> | Otherwise we'd be in real trouble! |
| 13:52 | <@Tamber> | I know, right? |
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| 15:10 | <&McMartin> | I know of at least one company that retains VAX/VMS or Alpha/VMS as a target OS, apparently for the uptime. |
| 15:10 | <&McMartin> | But it commits the deadly sin of Not Being UNIX, I suppose, and as we all know, being exactly like Unix is how you define "sanity" |
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| 16:20 | <&jeroud> | Didn't it predate unix? |
| 16:20 | <&jeroud> | Or am I thinking of something else? |
| 16:20 | <&McMartin> | In practice I think it was a rough contemporary, though it may have slightly. |
| 16:21 | <&McMartin> | The VAX was definitely still around when UNIX was. |
| 16:21 | <&McMartin> | I open the OpenSSL Rampage is doing more than deleting code involving platforms that aren't OpenBSD, though. We have preprocessors for that. =P |
| 16:21 | <&McMartin> | s/open/hope/ |
| 16:22 | <@celticminstrel> | Okay, the shader is definitely running, but it's not correctly applying the mask somehow. |
| 16:23 | <@celticminstrel> | When I changed it to draw the mask instead of the image, I get all plack, suggesting it may be using the same pixel from the mask for every pixel from the image. |
| 16:25 | <@celticminstrel> | ...plack. |
| 16:25 | <@celticminstrel> | Black, duh. |
| 16:29 | <@celticminstrel> | Does this look okay? (Except line 13 should be texpix, not maskpix.) http://pastebin.com/reBMRTtK |
| 16:30 | <@celticminstrel> | Anything obviously wrong there? |
| 16:30 | <@celticminstrel> | The goal is to use a portion of the mask texture sort of as an alpha channel, where the mask texture is known to be just black and white. |
| 16:31 | <@celticminstrel> | The textures aren't the same size, maybe that could be an issue... and I'm actually only using a portion of the main texture as well. |
| 16:32 | <@celticminstrel> | The portions to be used should be the same size. |
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| 17:00 | < Xon> | McMartin, a lot has been throwing sane & consistant code formating and removing layers and layers of insane macro wrapppers |
| 17:01 | < Xon> | or at least that is how it looks like |
| 17:01 | <@celticminstrel> | I have no idea why this isn't working. It does work in the Shader Builder tool, though, more or less. |
| 17:03 | <@celticminstrel> | I say "more or less" because Shader Builder only operates on full textures as far as I can tell, and I want to just operate on a portion of the texture. |
| 17:03 | <&McMartin> | Xon: ... gmm |
| 17:03 | <&McMartin> | hmm |
| 17:04 | <&McMartin> | I remember wanting something back in 2002 that would expand only a subset of the #defines, and I remember not finding anything that would do this systematically. |
| 17:06 | <@celticminstrel> | Anyone have any ideas? |
| 17:06 | < Xon> | McMartin, http://opensslrampage.org/post/83104947975 <- this is a rather sad bug. |
| 17:07 | <&McMartin> | OK, that's a proper bugfix, good. |
| 17:07 | < Xon> | land-mine API =| |
| 17:08 | < Xon> | http://opensslrampage.org/post/83006997401/portability-is-guarding-against-dev-n ull-wandering <- not sure why OpenSSL thought /dev/null can wander |
| 17:08 | <&McMartin> | Defensive coding~ |
| 17:09 | <&McMartin> | I don't know enough about Every OS In The Entire Fucking World to know if there are null devices on OSes they support that act like /dev/null but aren't called that =P |
| 17:09 | <@celticminstrel> | Oh, I found another person doing something similar. |
| 17:09 | <&McMartin> | But if I'm OpenBSD, I don't care; it is not OpenBSD, burn it down, get a real OS |
| 17:12 | <@celticminstrel> | Didn't really help much. |
| 17:13 | <&McMartin> | Yeah |
| 17:13 | <&McMartin> | And given the general mess of the code, I'm pretty sure I'm being unduly suspicious |
| 17:13 | | * celticminstrel sighs. |
| 17:14 | < Xon> | McMartin, the NUL_DEV compiler symbol /isn't actually used/ |
| 17:14 | <&McMartin> | Then that's "dead code elimination", now isn't it~ |
| 17:17 | < Xon> | McMartin, I'm not sure why OpenSSL had support for emulated x86 big-endian =p |
| 17:18 | < Xon> | http://opensslrampage.org/post/83031733755/remove-support-for-big-endian-i386-an d |
| 17:18 | < Xon> | amusng |
| 17:19 | <&McMartin> | I think UQM technically supports that, if you set the relevant #defines manually =P |
| 17:21 | <&McMartin> | The comment also implies that the "support" was a single line of code |
| 17:23 | < Xon> | http://freshbsd.org/commit/openbsd/c862290df5533966091ded3906da184f1cac8675 |
| 17:23 | < Xon> | nope :( |
| 17:23 | <&McMartin> | Aha |
| 17:23 | <&McMartin> | Where was the commit link? |
| 17:23 | <&McMartin> | They say they have them but I only see them on the main page, not on individual posts |
| 17:23 | < Xon> | the blog is horrible for finding them |
| 17:23 | < Xon> | cos rofl cvs |
| 17:24 | < Xon> | http://freshbsd.org/search?project=openbsd&q=Remove+support+for+big-endian+i386+ and+amd64. |
| 17:24 | < Xon> | dumping the title into that finds the commit |
| 17:27 | <@celticminstrel> | It seems almost certain that the issue is caused by only the upper left pixel of the mask being used. Although... if that were the case, I don't think I'd be seeing the texture drawn at all in some places. |
| 17:27 | <@celticminstrel> | Whoa. |
| 17:29 | <@celticminstrel> | It looks like masking is occurring, just somehow not with the right mask. |
| 17:29 | <@celticminstrel> | Maybe I need to scale the offset into 0..1. |
| 17:33 | <@celticminstrel> | Still doesn't work. |
| 17:49 | <@celticminstrel> | Hm, I wonder if I need to also use a vertex shader... |
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| 18:52 | <@celticminstrel> | It doesn't even work if I copy the bits to draw into their own texture. |
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| 19:31 | <@celticminstrel> | I'm not quite sure why my computer seemingly crashed, but I assume it has something to do with building the application while it was already running. |
| 19:52 | <@celticminstrel> | Oh wow! Something works! |
| 19:52 | <@celticminstrel> | Okay, so. |
| 19:53 | <@celticminstrel> | The mask is being applied correctly, but the transformation is not being applied. Is that because I'm using a shader? |
| 19:54 | <@celticminstrel> | It's neither being flipped vertically nor being translated to the correct position onscreen. |
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| 20:48 | <@celticminstrel> | Still, I suppose it's progress, sort of. |
| 20:50 | <&McMartin> | Shaders replace their section of the pipeline; they do not extend it |
| 20:51 | <@celticminstrel> | But aren't vertex and fragment shaders different parts of the pipeline? |
| 20:52 | <&McMartin> | Yes, but I'm not sure whose job setting up texture samples is, for instance |
| 20:52 | <@celticminstrel> | Ooh, I just noticed I actually wasn't doing any translation. |
| 20:53 | <@celticminstrel> | Okay, now the only thing missing is flipping it vertically. |
| 21:00 | <@celticminstrel> | gl_TexCoord is read-only in a fragment shader. |
| 21:03 | <@celticminstrel> | ...I should double-check that I'm not actually using the wrong mask, |
| 21:07 | <@celticminstrel> | Okay, yeah, I'm not. |
| 21:12 | <@celticminstrel> | It works! With the minor caveat that it isn't using the right texture sometimes, but that's a logic error in my program. |
| 21:13 | <@celticminstrel> | ie, that's me telling it to use the wrong texture. |
| 21:13 | | Vornicus [Vorn@ServerAdministrator.Nightstar.Net] has joined #code |
| 21:13 | | mode/#code [+qo Vornicus Vornicus] by ChanServ |
| 21:37 | <@celticminstrel> | ... |
| 21:37 | <@celticminstrel> | Why is there random data at the end of the shader. |
| 21:40 | <@celticminstrel> | Oh, I guess ifstream.read doesn't put a null at the end. |
| 21:52 | | HotShot[ipad] [HotShot@Nightstar-v7se27.try.wideopenwest.com] has joined #code |
| 21:53 | | HotShot[ipad] [HotShot@Nightstar-v7se27.try.wideopenwest.com] has quit [Connection closed] |
| 21:57 | | Number3 is now known as AnnoDomini |
| 22:38 | | JackKnife [Z@Nightstar-484uip.cust.comxnet.dk] has quit [Ping timeout: 121 seconds] |
| 23:20 | <@gnolam> | http://freshbsd.org/commit/openbsd/eb5404392180ab68f190860b9d72a2cfea3b87df |
| 23:20 | <&McMartin> | celticminstrel: Yeah, it doesn't; it's like fread, not scanf("%s") |
| --- Log closed Sat Apr 19 00:00:01 2014 |