Just a comment on "buggy" drivers. The EGL spec does not REQUIRE a driver to support any form of context sharing. It does ALLOW a driver to support context sharing if it has the resources (both hardware and software) to do so. The driver is REQUIRED to return specific error codes if fails to do what was requested.
The implications of this are: - that a driver may choose not to allow context sharing at all. If the correct errors are returned, the driver is a conforming implementation. - on a particular device, calls to share contexts may succeed or fail depending on the resources that have already been consumed by other programs. On Friday, August 3, 2012 1:49:52 PM UTC+1, Latimerius wrote: > > On Fri, Aug 3, 2012 at 12:38 AM, Romain Guy <[email protected]> > wrote: > >> Well, keep in mind that you can't issue GL calls from a thread > >> different than the rendering thread (well unless you play games with > >> multiple EGL contexts sharing resources which doesn't even seem to > >> work on the incomplete/buggy EGL implementation on Android). > > > > It works, WebView is (or used to) rely on this feature. You might be > > running into a driver specific bug though. > > That's definitely good to hear, although very few people seem to know > how to achieve it. I asked about it a few weeks ago, with no reply: > > > https://groups.google.com/forum/?fromgroups#!searchin/android-developers/egl/android-developers/BHH08ak8MRA/mXaHFPNKMl8J > > > It came up again a couple of days ago on android-ndk in this thread: > > > https://groups.google.com/forum/?fromgroups#!searchin/android-ndk/egl/android-ndk/V3VpH65tpqA/blOrbldg7j0J > > > The consensus seems to be it doesn't work. Note also a link there to > a Mozilla dev blog post, he also comes to the conclusion context > sharing doesn't work on Android. > > As far as a buggy driver goes - could be. One thing I know is that > the failing behaviour was consistent across a bunch of Adreno > 200/SGX540 devices with Android 2.1 or 2.2. I'm not sure anymore if I > specifically tested it on Xoom/Honeycomb but if I did, it did not work > there either. > > Is there a specific incantation to make it work? From my reading of > the EGL spec, it should be as simple as passing the existing context > to eglMakeContext() as the shared context argument... > > Thanks! > -- 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
