[android-developers] Re: eglSwapInterval not exposed

That makes a lot of sense. Thanks for the info, i completely forgot
about compositing. I gather that some manufacturers might opt to
disable the compositing vsynch as it seems to be the case with the LG
Star.

On 17 Dez., 03:07, Dianne Hackborn <hack...@android.com> wrote:
> Currently you can never draw directly to the screen, so this isn't
> meaningful.  You are always drawing into a surface flinger surface, which is
> composited to the screen when you are done, and screen compositing is
> vsynced.
>
> On Thu, Dec 16, 2010 at 5:21 PM, Mario Zechner <badlogicga...@gmail.com>wrote:
>
>
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>
>
>
>
>
>
> > Hi,
>
> > i was curious to see whether the vsynch that is default on all devices
> > is actually a hardware limitation of a software limitation. For this i
> > first tried to get EGL_MIN_SWAP_INTERVAL. Neither EGL10 nor EGL11
> > expose that constant. Fair enough, the official EGL headers show me
> > the constant value. I was surprised to find that my Hero has a
> > EGL_MIN_SWAP_INTERVAL of 0. So you could in fact disable vsynch.
>
> > For that you need eglSwapInterval. Only problem is that it's not
> > exposed in the Java interface. It is however in the latest r5 release
> > of the NDK, the first one to expose EGL functionality on the native
> > side of things. Is there any way to backport this to to native code
> > for say a 1.5 device? Or a 2.1 device?
>
> > I know that turning of vsynch is probably a bad idea on a battery
> > powered device. But i'd still like to have complete control if at all
> > possible. The LG Star (Optimus 2X) featuring that shiny Tegra chip
> > seems to have vsynch disabled by default, running at higher framerates
> > than the display is capable of handling (a lot more than 60Hz).
>
> > Ciao,
> > Mario
>
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> --
> Dianne Hackborn
> Android framework engineer
> hack...@android.com
>
> Note: please don't send private questions to me, as I don't have time to
> provide private support, and so won't reply to such e-mails.  All such
> questions should be posted on public forums, where I and others can see and
> answer them.

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