seems that gc is a problem, just one of them at least, so can we please have a c++ sdk?
On Tue, Mar 31, 2009 at 9:26 PM, shaun <shashepp...@gmail.com> wrote: > > I started going down the path of Object pooling. It seemed the only > solution when taking an existing engine and making work on a resource > constrained system like Android on a phone. Determining the strategy > for returning objects to the pool proved quite tough for me. I have > no doubt there are some experts on embedded systems programming with > tons of experience with object pooling. We just would be too lucky if > that person(s) was also experienced with Java, physics engines and had > a passion for open source and games! Is that too much to ask? LOL!! > > On Mar 31, 12:17 pm, mscwd01 <mscw...@gmail.com> wrote: > > Thanks for your feedback Shaun, I too unfortunately think a bespoke > > engine will need to be written for Android, which is a real pity as > > the iPhone has several physics engines which can easily handle > > hundreds of objects. > > > > Having said that Anton (2nd reply) has said he has an engine running, > > it would be nice to see a demo of this if that'd be possible? > > > > Clark, i'd definately host any .apk's on my own site, I wouldn't put > > it on the marketplace if it wasn't a "finished" app - do people > > actually do that?! > > > > I think i'll stay away from developing games with physics for the time > > being and concentrate on something else, I cant see it being feasible > > to include it any time soon which is a real pity. > > > > On Mar 31, 3:28 pm, shaun <shashepp...@gmail.com> wrote: > > > > > I am the author of simpull. > > > > > Sorry guys for the demo being out of whack for Simpull to the Core. > > > The version of PulpCore that I integrated simpull with did not support > > > Chrome, but you should be able to see it in IE, FF Safari. It is nice > > > to take a look at that demo to get a feel for what the engine is > > > capable of, but the performance does not translate over to the fixed > > > point branch/version of simpull when running on Android. > > > > > I ran tests on both the emulator and the actual device and there was a > > > significant increase in performance because of the fixed point > > > implementation, but I got very frustrated that it still did not > > > support the amount of objects in a scene that I considered good for a > > > physics-based game. It seemed to handle ~10 objects moving and > > > colliding OK. It has been a while since I was playing with it, so I > > > do not really remember the exact number of objects or the frame rate. > > > I mostly remember being upset with it. > > > > > I am leaving the physics ideas for games out of the picture when > > > thinking Android for now. Someone would have to write a ground up > > > engine with all the performance and memory concerns of Android in > > > mind, which was not the case with Simpull.....I created it for > > > applets, then thought to port over to fixed-point for Android. It > > > works well with small scenes, but certainly not the staple engine to > > > use in my opinion. > > > > > Also, Phys2D will not run worth a damn on Android. I tried it and I > > > even went through some heavy performance tuning. Garbage collection > > > is the major issue even after all I did. I seriously doubt JBox2D > > > will run well either. I'll stick to what I said earlier, a ground-up > > > solution by someone smarter than me is probably required. > > > > > On Mar 31, 9:49 am, "admin.androidsl...@googlemail.com" > > > > > <admin.androidsl...@googlemail.com> wrote: > > > > Not tried but if you can provide us with some example source code or > > > > put something on the market, I'm sure we could take a look. > > > > > > G1 performance is significantly faster than emulator, but there are > > > > limitations. > > > > > > Particularly with garbage collection and memory allocation on code > > > > that gets run continuously in loops, so I don't know how optimised > > > > these physics engines are for this purpose. > > > > > > Would be interesting to find out though. > > > > > > On Mar 31, 12:52 pm, mscwd01 <mscw...@gmail.com> wrote: > > > > > > > Oh I forgot to re-ask... > > > > > > > "Has anyone tested Phys2D or JBox2D on an actual device to see if > they > > > > > run better than on the emulator? > > > > > > > I have a feeling the performance will better on a G1 than the > emulator > > > > > for some reason! > > > > > > > On Mar 31, 12:51 pm, mscwd01 <mscw...@gmail.com> wrote: > > > > > > > > I did take a look at Simpull, however the demo application failed > to > > > > > > run as it relied on some library which wasn't supplied or > referenced > > > > > > to - I just got annoyed after spending two days failing to get > Phys2D > > > > > > and JBox2D to work in Android and didn't bother trying to work > out the > > > > > > problems! > > > > > > > > I might give it another look though... > > > > > > > > On Mar 30, 10:41 pm, Streets Of Boston <flyingdutc...@gmail.com> > > > > > > wrote: > > > > > > > > > I wonder how well this one works on Android: > > > > > > > > > http://code.google.com/p/simpull/ > > > > > > > > > -- Anton Spaans > > > > > > > > > On Mar 30, 4:58 pm, Anton <socialhac...@gmail.com> wrote: > > > > > > > > > > I have a simple 2D physics engine written and running. > It uses > > > > > > > > the now famous Jacobson physics tricks (Verlet integration > and hard > > > > > > > > constraints). I can manage 40 balls on the screen, with fill > n^2 > > > > > > > > interaction between balls. I am working on spatial data > structure > > > > > > > > optimizations now to improve the computational complexity of > the > > > > > > > > collision detection code. I run the constraint update loop > five times > > > > > > > > per frame and get 30 frames per second. Once the engine is > up and > > > > > > > > running there are no memory allocations done in my program. > And once > > > > > > > > the system settles down from the app launch there are very > few GC > > > > > > > > events from other programs. Though they do still happen. > Viewing > > > > > > > > LogCat I see a GC every 10 or 20 seconds because of some > background > > > > > > > > application. But between those events I get a consistent > frame rate. > > > > > > > > I am using OpenGL for my rendering. > > > > > > > > > > -Anton > > > > > > > > > > On Mar 30, 1:14 pm, mscwd01 <mscw...@gmail.com> wrote: > > > > > > > > > > > Does anyone know of, or have implemented, a physics engine > which runs > > > > > > > > > smoothly in Android? > > > > > > > > > > > I have spent the last couple of days trying Phys2D and > JBox2D, however > > > > > > > > > both perform very poorly - I am struggling to get even a > few objects > > > > > > > > > to simulate smoothly as frequent garbage collection spoils > it. > > > > > > > > > > > One question I do have is will these run smoother on an > actual G1 > > > > > > > > > device or is the performance of the emulator accurate? > > > > > > > > > > > Thanks- Hide quoted text - > > > > > > > > > > - Show quoted text - > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
