Error QOpenGLShader: could not create shader



  • Hi,
    I am new to qt and I just set-up cross-compilation on my raspberry pi using the below guide.
    https://mechatronicsblog.com/cross-compile-and-deploy-qt-5-12-for-raspberry-pi/
    After this I tried to run a simple widget program and it gave me below error :
    '''
    QOpenGLShader: could not create shader
    Could not link shader program:
    ""
    QOpenGLShaderProgram: could not create shader program
    QOpenGLShader: could not create shader
    QOpenGLShaderProgram::uniformLocation(texture): shader program is not linked
    QOpenGLShaderProgram::uniformLocation(mat): shader program is not linked
    '''
    And the raspberry pi screen goes blank instead of showing the simple label it had . Any guidance as to what this error is related to and how to solve it would be grately appreciated.
    I am using Raspberry Pi 3 running raspbian stretch, and im compiling qt 5.12.3 using ubuntu 16.04 .



  • Problem Solved . Found it in one of the comments of the same site:
    https://mechatronicsblog.com/cross-compile-and-deploy-qt-5-12-for-raspberry-pi/

    Typing it again .
    It seems like the lib /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2 is wrong.
    The right lib is /opt/vc/lib/libbrcmGLESv2.so
    So, make a backup of /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2 then
    rm /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2

    and :

    ln -s /opt/vc/lib/libbrcmGLESv2.so /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2
    
    I can now run my cross compiled app from Qt Creator on Rasp.


  • Problem Solved . Found it in one of the comments of the same site:
    https://mechatronicsblog.com/cross-compile-and-deploy-qt-5-12-for-raspberry-pi/

    Typing it again .
    It seems like the lib /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2 is wrong.
    The right lib is /opt/vc/lib/libbrcmGLESv2.so
    So, make a backup of /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2 then
    rm /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2

    and :

    ln -s /opt/vc/lib/libbrcmGLESv2.so /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2
    
    I can now run my cross compiled app from Qt Creator on Rasp.


  • @abdussalam Thank you ! Really !


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