21:34 < sulix> I'm not sure what changed, but now ipdf crashes my OpenGL debugger.
21:42 < sulix> The QuadTree/GPU code works again!
21:42 < sulix> Somehow the bug I fixed last night reappeared, but I've added the needed *2s back in.
+--- Day changed Fri Aug 15 2014
+08:43 < matches> So it seems to work well but things still go wierd on the GPU
+08:44 < matches> I'm in Quadtree node 32 looking at the tip of Humphrey's eyebrow
+08:44 < matches> The bottom line moves normally
+08:44 < matches> Vertically only sorry
+08:44 < matches> It doesn't move horizontally
+08:44 < matches> The top line stays still and every so often jumps to a new (wrong) position
+08:45 < matches> On the CPU it appears fine though
+08:45 < matches> Although on the CPU it doesn't show the "Current View QuadTree Node: 32"
+08:46 < matches> Hrm, I should add a 2d view of a car to the svg-tests
+08:47 < matches> Then I can be like "IT IS RELEVANT TO MECHANICAL ENGINEERING BECAUSE BEZIERS"
+08:47 < matches> In the conference/thesis offense
+08:48 < matches> My concern is actually more how I'm going to present the arbitrary precision number representations because they don't even work
+08:49 < matches> Well I should probably try Gmp rationals and Gmp floats before totally giving up I guess
+08:49 < matches> And also those p-adic things
+08:50 < matches> I never looked them up
+--- Day changed Sun Aug 17 2014
+14:38 < matches> Hey Qt has a lot of stuff in it
+14:38 < matches> They have their own iostreams that seem identical to std::iostream
+14:39 < matches> It's kind of cool I guess except there are "Qs" everywhere
+14:41 < matches> Ok we need a window icon
+14:41 < matches> This is vital
+15:54 < sulix> I've got SDL2 window icon setting code if you want it: https://github.com/sulix/omnispeak/blob/master/src/icon.c#L555
+16:04 < matches> Cool
+16:39 < matches> I'm bringing in spaghetti
+16:39 < matches> I mean Qt
+16:40 < matches> In theory this means the Debug functions should have a mutex if we want to debug things in the Qt stuff
+16:40 < matches> But in practice screw it
+16:40 < matches> What could go wrong?
+16:41 < matches> (Don't worry, I have a CONTROLPANEL_DISABLED define)
+16:42 < matches> This View/Document/Screen thing could probably be tidied up a lot
+16:42 < matches> But effort
+16:42 < matches> I think I'll just give ControlPanel direct access to document, screen and view
+16:42 < matches> Currently everything has to go through view
+16:43 < matches> Which would make more sense if some of screen was in view maybe
+16:43 < matches> Bah screw design
+16:51 < matches> So now we have 4 main classes!
+16:51 < matches> 4 x the fun!
+17:29 < matches> Bargh Qt needs its own version of make
+17:29 < matches> That's stupid
+21:09 < matches> So
+21:10 < matches> I have a mysterious LMS deadline that suddenly appeared
+21:10 < matches> "Progres Report"
+21:10 < matches> Description
+21:10 < matches> "asadf"
+21:10 < matches> Due
+21:10 < matches> 19th August, 11:01PM
+21:10 < matches> What
+21:14 < sulix> Oh dear.
+21:15 < matches> I have sent an email
+21:15 < matches> I hope that's not the conference abstract
+21:15 < matches> I also really hope we're allowed to use our own computer and things in the conference
+21:16 < matches> Also I really hope that if I can use my own computer it doesn't decide to shit itself anyway just to spite me
+--- Day changed Mon Aug 18 2014
+17:06 < matches> Good news and bad news!
+17:07 < matches> The kerning now appears to kern in the right direction
+17:07 < matches> But this means "BleedingCowboys.ttf" works
+20:30 < sulix> It's a pain to look up clipping of beziers, because there's a separate technique for doing something else called "bézier clipping"
+20:40 < matches> Baha
+20:41 < matches> I'm basically just procrastinating with Qt
+20:41 < matches> I mean
+20:41 < matches> Doing *awesome* things with Qt
+20:48 < sulix> I am looking with considerable envy at SolveQuadratic().
+20:49 < sulix> SolveCubic() will get very ugly.
+20:49 < sulix> Assuming I don't just sample the cubic at 100 points and look for roots.
+20:49 < matches> Haha
+20:49 < matches> Newton Raphson?
+20:50 < sulix> Very tempting.
+20:50 < matches> Then you can solve any bezier!
+20:50 < matches> Then we can put in Quintics!
+20:50 < sulix> Solving cubics exactly is not fun.
+20:50 < sulix> Dear god no.
+20:50 < matches> Imagine how many loops a quintic could have...
+20:51 * sulix cries quietly in the corner.
+20:53 < matches> So I'm calling AddText with sane values and nothing is happening :(
+20:56 < sulix> With or without quadtree?
+20:56 < sulix> With quadtree, everything is broken if you try adding things.
+20:56 < sulix> Because they won't be added to a node.
+20:57 < matches> No quad trees I think
+20:57 < matches> Yeah no quad tree
+21:00 < matches> Wait I think we need to rebuild the buffers or something
+21:07 < matches> Ah, ForceRenderDirty()
+21:14 < matches> I don't think the scale of our text is quite right?
+21:14 < sulix> Well, the scale of everything is wrong, but it's entirely possible that the text is _extra wrong_
+21:16 < sulix> In theory, the "scale" input to addText is the "height" of a character.
+21:19 < matches> Mmm
+21:19 < matches> I'm trying to add text relative to the current view
+21:19 < matches> But it isn't consistent
+21:19 < matches> When I go to a different view it is definitely not adding it in the same relative place
+21:20 < matches> The scale and positions aren't *already* relative are they?
+21:22 < sulix> Not to the view...
+21:24 < matches> What are they relative to?
+21:24 < matches> Anyway instead of fixing that bug I'm adding more
+21:25 < sulix> Umm... The bounding box maybe?
+21:25 * sulix investigates.
+21:26 < sulix> Scale and position should (I think) be normal, document coordinates.
+21:26 < matches> Odd
+21:26 < matches> Oh well
+21:26 < matches> Having Qt is totally worth it by the way
+21:27 < matches> Although it is still slightly embarrassing that it has its own SVG parser
+21:27 < matches> Ours is better!
+21:27 < matches> It has Reals everywhere!
+21:27 < matches> Except where it constructs Real from floats...
+21:27 < matches> And converts them to floats...
+21:28 < sulix> Thesis title should be "Keepin' it real: Staying afloat on the sea of document precision"
+21:31 < matches> Bahaha
+21:31 < matches> That is brilliant
+21:32 < matches> The Qt stuff is never deleting anything
+21:32 < matches> I suppose I should fix that at some point
+21:33 < matches> So basically it is a state machine and you use the menu to change the state
+21:33 < matches> Pressing OK does something depending on the state
+21:34 < matches> And there is a single text edit you can type stuff into
+21:34 < matches> In theory it can hide/show different widgets depending on the state
+21:34 < matches> I feel like I should add a "Generate Thesis Title" widget now...
+21:35 < matches> Also I can sort of see the appeal of lambdas for GUI programming now
+21:35 < matches> But I have a feeling they would totally break Qt anyway
+21:49 < matches> ...
+21:49 < matches> Ok sometimes the text gets added upside down...
+21:49 * sulix disclaims any and all responsibility for that.
+21:51 < matches> Yes!
+21:51 < matches> I finally did that thing I was saying I'd do for like 3 weeks
+21:51 < matches> Zoom in to floating point limit
+21:51 < matches> Add SVG
+21:51 < matches> Watch it explode!
+21:52 < sulix> Oooh...
+21:52 < matches> It is glorious
+21:54 < matches> We need to be a bit careful with thread safety in qt
+21:55 < matches> Really we should be able to request that the qt thread call UpdateAll itself
+21:55 < matches> Rather than calling it directly from the viewer thread
+21:55 < matches> But I'm not sure how that's done
+21:55 < matches> There's all this stuff about "Cross thread signals" on the internet
+21:56 < matches> It seems you can hide/show things but not much else
+22:47 < matches> Bah you pushed things!
+22:55 * sulix proclaims the new features as excellent and promptly goes to bed.
+--- Day changed Tue Aug 19 2014
+18:08 < matches> My conference is in the week starting 13th October
+18:08 < matches> Is Tim back then?
+18:08 < matches> "your supervisor will be invited to attend and mark your presentation"
+18:09 < matches> So if he can't go... I don't get a mark?
+18:12 < matches> It sounds suspiciously like they are going to get everyone's supervisors to mark them and then just scale everyone :S
+18:13 < matches> Surely at least one other person is going to read the final report...
+18:13 < matches> I've heard bad things about the engineering scaling system
+18:14 < matches> Your mark becomes inversely proportional to how well your supervisor's students did the previous year or something like that
+18:15 < matches> Anyway, two months left to accomplish something!
+20:05 < sulix> Worked out why the font bounds were weird.
+20:06 < sulix> AddText takes (msg, scale, x, y) not (msg, x, y, scale), so the coordinates were all bunk.
+20:09 < sulix> Fonts looks _amazing_ with floating pt errors, too.
+20:09 < sulix> http://davidgow.net/stuff/ipdf-i-think-you-mean-comic-fail.png
+20:29 < sulix> The Art of Computer Programming briefly mentions the Stern-Brocot tree, btw.
+20:29 < sulix> I can't see it being really useful, though.
+21:06 < sulix> My difficulty clipping bézier paths may be because it is actually impossible.
+21:06 < sulix> I think I've just found a paper saying that it is only possible for béziers which happen to be straight lines.
+22:55 < sulix> Never mind, it is possible, it's just very nasty.
+23:15 < sulix> Also C++14, because we need more lambdas: https://isocpp.org/blog/2014/08/we-have-cpp14
+--- Day changed Wed Aug 20 2014
+12:05 < matches> I guess we've accomplished the goals for this week's meeting then!
+12:05 < matches> (That shading algorithm totally counts as a "first attempt")
+12:07 < sulix> I'm about 2/3rds of the way through deriving the reparametrisation of béziers.
+12:08 < sulix> It basically just boils down to pages and pages of rearranging polynomials.
+12:38 < sulix> I managed to get the qt4/qt5 monstrosity compiling on my laptop.
+12:38 < sulix> It has a "moc-qt4" program, which works, whereas "moc" is qt5.
+16:28 < matches> I think I need to stop adding this log to git...
+23:08 < sulix> matches: But then, how would history record that I've finally got a maybe-correct derivation for cubic bézier reparametrisation: http://davidgow.net/stuff/cubic_bezier_reparam.pdf
+23:08 < sulix> (Code is in git)
+--- Day changed Thu Aug 21 2014
+12:57 < sulix> So it turns out that quadtrees are hard, and reparametrising béziers is why.
+13:03 < matches> I don't seem to see anything anymore with the quad tree enabled
+13:10 < sulix> The quadtree doesn't let you add things in realtime.
+13:10 < sulix> Quadtree nodes are immutable once created.
+13:12 < matches> Ah
+13:35 < sulix> debug: ReParametrise (bezier.h:190) - (0.000000,0.000000),(1.000000,1.000000),(1.000000,1.000000),(1.000000,1.000000) -> (-nan,-nan),(-nan,-nan),(-nan,-nan),(-nan,-nan)
+13:36 < sulix> Looking good!
+13:54 < sulix> Clearly, the quadtree rendering is now perfect: http://davidgow.net/stuff/ipdf-this-is-definitely-a-fox.png
git.ucc.asn.au / ipdf / documents.git / blobdiff
UCC git Repository :: git.ucc.asn.au