Re: [android-developers] Re: GL10 access from outside of the rendering thread ...

You still haven't clearly explained how you use the GL context from two different threads? I understand you're locking, etc. But are you doing an eglMakeCurrent() to transfer ownership from GLSurfaceView's thread to another thread?

On Sun, Jul 1, 2012 at 5:30 PM, glenn@wanderfulstorybooks.com <glenn@wanderfulstorybooks.com> wrote:

Romaine,

I am only called from Andrioid with a useable GL10 context from GLSurfaveView.Renderer.onDrawFrame (or onSurfaceXXX).  If I save the value and try to use it from another thread, it does not work.  Please ignore the question of locking.  I was trying to inform you that I have been developing software for 35 years and wasn't asking anything stupid.  I know I cannot use the context from two thread simultaneously.  That is what the locking is for.  In this manner, I am able to set the gl context on a different thread and use it successfully on iOS, OSX, Win32, etc.  The OpenGL ES spec says nothing about Andrioid, which perhaps is an act of discretion ...

On Saturday, June 30, 2012 4:33:32 PM UTC-7, gl...@wanderfulstorybooks.com wrote:

Hello,

I am optimizing an OpenGL-based application ported from that other
major mobile OS and find that I cannot successfully access the GL
context from anything other than the rendering thread of
GLSurfaceView.  What I CAN do on other platforms is upload my single
(and large) texture to GL prior to needing to render the texture
itself.  This is a 640x480 8-bit RGB texture that takes some time to
upload to the chip and needs to be done every time I realize a new
frame of animation from the background system memory buffer.  I'm sure
you can appreciate the savings in execution time if I can perform this
upload from another thread when I have nothing left to do but wait for
GLSurfaceView's rendering thread to call me.  All is synchronized
safely as evidenced by the successful release of this software using
this very same technique on that-other-platform-that-shall-not-be
named.  Things are very smooth and zippy on that platform, but Android
currently suffers by comparison.  Is there any way to do this?


Thanks

Glenn

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Romain Guy
Android framework engineer
romainguy@android.com

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