glReadPixels break when it is used from an application of Cascades?

I'm trying to use Cascades of glReadPixels() of the OpenGL ES 2.0 active app.  Unfortunately, it crashes.

If I use glReadPixels() from within the native SDK model OpenGL ES 2.0 than the QDE creates (no Cascades/natives only), it works.

But, if I use an OpenGL ES 2.0 active Cascades app, it fails.

I use it since in a ForeignWindowControl.  I use a version modified the example of GoodCitizenCascades (which I modified to work with Beta 3 for BlackBerry 10 - the original only works with Beta 2) found here: https://github.com/blackberry/Cascades-Community-Samples.  OpenGL rendering occurs in a separate thread.

My code looks like this (Yes, it's not optimal, but it works for the tests):

unsigned char * Byte = (unsigned char *): malloc (500 * 1000 * 3);
: glPixelStorei (GL_PACK_ALIGNMENT, 1);
: glReadPixels (0, 0, 500, 1000, GL_RGB, GL_UNSIGNED_BYTE, Byte);
: free (pImage);

The debugger shows the app crashing into one of the subroutines that call glReadPixels().  Unfortunately, there is no further details go, not to mention that.

I don't think that it's the width/height because they are below what the screen width/height is set to.

The code is called immediately after the other objects are drawn on the screen, and before the exchange of buffers is called.  So it's called go the same thread and at the same time as the other OpenGL stampings.

I compared the Initialise OpenGL for Cascades vs sample how how the native model OpenGL ES2.0 initialize OpenGL, and they are basically the same.

If there is a place to download sets of projects / complete code, I'd be happy to do so.

Thank you

Mark

I pasted the code (but removed the::'s) in the last GoodCitizen.cpp class and the application has not crashed.)  I'm running it with a recent release so it may have been due to a bug in the former application code, or a bug in the operating system you're using now.  I present the latest version for review later this week and it should be posted next week.  You must also pass in the latest beta of BlackBerry 10 when it is released.

Tags: BlackBerry Developers

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