C++ opengl are 2.0 eglGetDisplay fails

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• Mixture of stunts and OpenGL ARE

  I use bbndk - 10.0.4 - beta with a Dev Alpha device. I want to have a record of the user of Cascades interface on top of an OpenGL ES 2.0 window. The web page of the Cascades examples indicates that this is possible.

  To see if it worked, I adapted the HelloForeignWindow sample so that the child window is linked to an OpenGL ES 2.0 context. I have essentially merged with the HelloForeignWindow sample GLES20Template sample and adapted bbutil_init_egl() so that it calls:

  screen_create_window_type (& screen_win, screen_ctx, SCREEN_CHILD_WINDOW)

  Instead of screen_create_window().

  All code initialization RULES and screen_ * works very well and is called createForeignWIndow() that is triggered by an event from the user interface. Note that this means that the following code is running in a different thread from the code in HelloForeignWindowApp::run() where I want to do my rendering:

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      QByteArray groupArr = group.toAscii();
      QByteArray idArr = id.toAscii();
  
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            // Adaptation of normal bbutil_init_egl()
      if(bbutil_init_egl_child(mScreenCtx, idArr.constData(), idArr.length(), groupArr.constData(), groupArr.length()) != 0)
      {
      return false;
      }
  
      if(initializegl() != 0)
      {
      return false;
      }
      return true;
  }
  

  The problem is when I call glClear() from inside the HelloForeignWindowApp::run() , I get a crash because of error of segmentation:

  • Thread [10] (Suspended: Signal: SIGSEGV: Segmentation fault)
  • glClear() to 0x78009ee4
  • Render() to helloforeignwindowapp.cpp:275 0 x 104110
  • HelloForeignWindowApp::doNoise() to helloforeignwindowapp.cpp:306 0x1042fc
  • HelloForeignWindowApp::run() to helloforeignwindowapp.cpp:88 0 x 103908

  The segmentation fault made me suspect that OpenGL ES didn't like me it boot to a thread and call it in another thread. So I tried to put the initialization and the entire interior of the HelloForeignWindowApp::run (), which would now be called HelloForeignWindowApp::initForeignWindow (). Generating this error:

  • ApplicationPrivate::screenSupport: ERROR called from the thread interface user HelloForeignWindowApp (0xaf484)
  • ApplicationPrivate::screenSupport: ERROR called from the UI thread

  from the inside of the initForeignWindow () during the call to createForeignWindow(), although createForeignWindow() has not actually called before the error was raised.

  If you're still with me at this time, thank you! My questions are:

  • What is the right way to integrate an OpenGL window in the sample of HelloForeignWindow?
  • Why glClear() causes segfault during my first attempt?
  • On my second attempt, why the 'ERROR called from the UI thread' get fired?
  • Where is the documentation that I can study to understand the Cascades model more in detail of thread? (eg. How Application: exec() works exactly, how the: run() call is threaded etc..)

  Thanks a lot guys.

  PS I tried to attach a zipper of my project, but I can't find the option.

  Solved.

  After looking at your example, I changed my second attempt and I got, it works. The cause of the "Independent from the UI thread called ERROR" was the call to ForeignWindow::mainWindowGroupId() of in the HelloForeignWindowApp::run thread (). I put this in the constructor call, stored the QString resulting as a member and then makes any OpenGL initialization and screen wire HelloForeignWindowApp::run() as before.

  I think it is equivalent to the example of your provided in terms of thread.

  For people who want this example code, see examples of community of Cascades on the developers blog. Community Macadamian mixes stunts and OpenGL rendering.

  So it seems that the constructor is executed on the user interface thread "" in this case, which is a little confusing for me because it is called main(), and I thought that a characteristic of the Cascades was that the user interface has been made on the main thread by default.

      // We complete the transaction started in the app constructor and start the client event loop here...
      return Application::exec();
  }
  

  Can you explain this comment further or point me to a document that is in the configuration of threading for Cascades and how it decides what constitutes a "user interface thread?

• OpenGL are VBO

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  I know no need to speed change have more polygons in the 3d scene that I had to have.
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  I thank.

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• The installation cannot continue because some of the processes are running.  Installation failed

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• I'm using CS5 and when I try to upgrade packages: Bridge, Fireworks and Photoshop are downloaded, but updates fail-why?

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• upgrade important downloads failing

  ' error ' b100 - something "is not available on the list in the Help window. Why so much of the important downloads fail?

  Hi catbren,

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  2. did you of recent changes on the computer?

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  View update history to know which update is not installing.

  (a) open Windows Update by clicking Start , all programsand then click Windows Update.

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  I suggest that you reset the Windows Update components and you try to install updates.

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• I have updates that are missing on Windows Server 2008, with 80248014 error.

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• Safety poster Windows automatic updates is turned off, but they are on

  original title; Problems with automatic updates. Help, please.

  Security alerts Windows keeps advising me that I have automatic updates turned off even if I turned them on in the system menu. Security Center said, however, that they are turned off and fails to address the problem. I tried to run windows repair, but it has encountered an unexpected error and could not continue. I'm afraid that I have some types of malware on my computer and there is a security risk.

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• Security Center fails to notify.

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  Visit our Microsoft answers feedback Forum and let us know what you think.