Re: [android-developers] how to get reference to GLSurfaceView's rendering thread?

On Fri, Aug 3, 2012 at 12:38 AM, Romain Guy <romainguy@android.com> 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!

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