(moving out of android-developers, but posted for the last time so those who are interested can join the conversation on android-discuss)
Romain, can you confirm that the G1's Qualcomm MSM7201 CPU does not support java hardware acceleration? I'm reading here[1]: "528 MHz ARM11 Jazelle™[2] Java® hardware acceleration" And from what I've read on the net, MSM7201A-a is the dual-core CPU powering the G1. So, can you confirm that Android could be WAY WAY faster, if Android could use the Java, instead of the Dalvik VM, and that this didn't happen because of Sun??? Thanks [1] http://www.qctconnect.com/products/msm_7201.html [2] http://www.arm.com/products/multimedia/java/jazelle.html On Tue, Mar 31, 2009 at 10:07 PM, Romain Guy <romain...@google.com> wrote: > > Hi, > > You are mistaking two different things. Some Java ME phones have a > dedicated chip used to interpret the Java bytecode. OpenGL > acceleration is another thing entirely. The G1 has a dedicated GPU > that can be used to accelerate OpenGL. Any Android OpenGL application > benefits from that hardware acceleration. However, the Dalvik bytecode > is not hardware accelerated by a dedicated chip, but simply > interpreted with the CPU. > > On Tue, Mar 31, 2009 at 12:00 PM, Tseng <tseng.priv...@googlemail.com> wrote: >> >> From what i know, most of the Java/J2ME phones use the chipsets >> acceleration functions (some mobilephone CPUs are optimized for java >> accerlration in 2d/3d games). But since Android is not based on Java/ >> J2ME, it doesn't support this acceleration (even though the CPU used >> in the G1 supports Java Open GL acceleration). From what i've read, >> the reason for this is that android use it's own virtual machine to >> executing the bytecode. >> >> However, i'm not really sure if it's true, maybe one of the Android >> Engineers can confirm or deny it. With this in mind OpenGL could bring >> some more performance but it doesn't have to (unlike on onther Java >> phones) >> >> On Mar 31, 3:29 am, dm1973 <david050...@gmail.com> wrote: >>> I think you should learn OpenGl (even for 2D games). I haven't tried >>> it on Android yet but I image you can get much better results by doing >>> your animation using it than by doing drawing using the android APIs. >>> Off the top of my head, I don't know the hardware specs of the G1 but >>> if it is anything like the iphones accellerator, it has plenty of >>> power to make good looking smooth 2D games. >>> >>> On Mar 30, 12:30 pm, Stoyan Damov <stoyan.da...@gmail.com> wrote: >>> >>> >>> >>> > I will try to code a demo which does side scrolling tonight, but I >>> > don't know opengl, so I won't use it. >>> >>> > My phone is getting worse every day (I haven't used it as phone as a >>> > matter of fact for a while) but in case it does manage to show smooth >>> > scrolling, in the 5 seconds idle period, when it's not attempting to >>> > send an MMS to the GOD DAMN myFaves service (and thus trigger GC), >>> > I'll post the code. >>> >>> > Cheers >>> >>> > On Mon, Mar 30, 2009 at 11:36 AM, admin.androidsl...@googlemail.com >>> >>> > <admin.androidsl...@googlemail.com> wrote: >>> >>> > > Many of you will have read or contributed to the very long thread I >>> > > started a week ago on '[android-developers] Re: Anything on Android >>> > > that can do smooth scrolling?' >>> >>> > > That was a very useful discussion between devs and engineers on >>> > > whether additional performance could be made available to fast-moving >>> > > games by lowering priority or disabling other background threads. >>> >>> > > However, I wanted to create a separate thread to discuss what can be >>> > > done TODAY in existing games to solve this problem. >>> >>> > > Why is it a problem? Because there is not a single game in Android >>> > > Market that features smooth scrolling backgrounds. Games may not be >>> > > the only app needed, but they certainly need to be visually impressive >>> > > for the platform to survive. >>> >>> > > Why do I think there is a solution today? Because all components using >>> > > GridView and ListView in most cases feature very smooth scrolling - if >>> > > you don't believe me, go to the thumbnail scrolling view in the native >>> > > picture viewer. >>> >>> > > So what I am saying is there is some magic in the GridView / ListView >>> > > code which allows for smooth scrolling which games on Android platform >>> > > desperately need. Despite going through the source code extensively I >>> > > cannot discover what is needed to apply this to a game engine. >>> >>> > > Please could someone with a good low-level knowledge of the GridView >>> > > and ListView API's please please please provide a very simple demo of >>> > > how this smooth scrolling could be applied to scrolling an oversized >>> > > image either horizontally or vertically. >>> >>> > > Otherwise developers are all going to try and most likely fail to >>> > > figure this out themselves. Believe me I have spent many hours on this >>> > > looking at Android source code, surfaceviews, onDraw, dispatchDraw, >>> > > memory allocation, and nothing so far has given me anything close to >>> > > smooth scrolling. >>> >>> > > And I also know game developers are competing with each other and want >>> > > to guard their tricks of the trade. But ultimately, we are ALL >>> > > competing with rival mobile platforms and unless this issue can be >>> > > resolved, all android game developers will lose out. >>> >>> > > And the whole platform loses because there will be no quality games. >>> > > Why shouldn't our games look like this after all : >>> > >http://www.youtube.com/watch?v=Y4795KVt_kw- Hide quoted text - >>> >>> - Show quoted text - >> > >> > > > > -- > Romain Guy > Android framework engineer > romain...@android.com > > Note: please don't send private questions to me, as I don't have time > to provide private support. All such questions should be posted on > public forums, where I and others can see and answer them > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. 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