Hi everybody. This is my first post in the group, I hope not the
last :) .
I am working in an OpenGL application, and was analyzing the GLThread
code in ApiDemos in order to define the work loop in my app. I have
some questions about:
1/ In the fragment:
if(needToWait()) {
while (needToWait()) {
wait();
}
}
, why the if statement? I guess it could be related with some
synchronization issue, but I am not able to find any scenario where it
is necessary. I think that
while (needToWait()) {
wait()
}
would be enough.
2/ I think the member mContextLost is unnecesary. It is set to false
in the GlThread.surfaceCreated() method, at the same time that
mHasSurface is set to true. It is never set to true in all the code.
It is only read at needToWait(), in a logical 'or' operation with !
mHasSurface. I think mHasSurface is enough for the job, am I losing
anything?
3/ Why is mEglHelper.finish() called when mPaused is true (this is,
when the onPaused() callback in the ---Activity was called)? The
lifecycle of Activity specifies that onPaused() is called when the
activity is not at foreground. I understand that rendering is blocked
in wait() in this situation, but is it really necessary releasing the
EGL objects and recover them later?
4/ The run() method explains the use of sEglSemaphore in this
comment:
/*
* When the android framework launches a second instance of
* an activity, the new instance's onCreate() method may be
* called before the first instance returns from onDestroy().
*
* This semaphore ensures that only one instance at a time
* accesses EGL.
*/
EGL and GL are considered exclusive access resources? I understand
than the GPU is, but what's the problem in having different EGL and GL
contexts in different threads and processes?
Thank you and best regards,
David A. Velasco
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