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 <[email protected]> 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 <[email protected]>wrote: > > > > > > > > > > > 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 > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected]<android-developers%2Bunsubs > > [email protected]> > > For more options, visit this group at > >http://groups.google.com/group/android-developers?hl=en > > -- > Dianne Hackborn > Android framework engineer > [email protected] > > 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. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
