Qt Demos not rendering to screen

SanchayanMaity · wrote on 11 Feb 2016, 13:02

Hello,

I am using Qt 5.4 build with OpenEmbedded using meta-qt5 layer at fido branch on Tegra T30 platform. I have build the meta-toolchain-qt5 for the Qt5 SDK and using it along with QtCreator. Angstrom distribution is being used and I have X11 along with the LXDE desktop environment.

I am using the Hello GL2 and Cube examples from below
http://doc.qt.io/qt-5/examples-widgets-opengl.html

compiling them with Qt Creator and then transferring it to the module.

Inside the window, nothing is rendered, it just stays blank. The output of ldd is as follows.

    libQt5Widgets.so.5 => /usr/lib/libQt5Widgets.so.5 (0x40146000)
    libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5 (0x40526000)
    libQt5Core.so.5 => /usr/lib/libQt5Core.so.5 (0x4087f000)
    libGLESv2.so.2 => /usr/lib/libGLESv2.so.2 (0x40c11000)
    libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x40ce1000)
    libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x400cf000)
    libc.so.6 => /lib/libc.so.6 (0x40d8e000)
    libpthread.so.0 => /lib/libpthread.so.0 (0x4002c000)
    libm.so.6 => /lib/libm.so.6 (0x40ec8000)
    libpng16.so.16 => /usr/lib/libpng16.so.16 (0x40f42000)
    libz.so.1 => /lib/libz.so.1 (0x40054000)
    libicui18n.so.54 => /usr/lib/libicui18n.so.54 (0x40f62000)
    libicuuc.so.54 => /usr/lib/libicuuc.so.54 (0x410dd000)
    libdl.so.2 => /lib/libdl.so.2 (0x40063000)
    librt.so.1 => /lib/librt.so.1 (0x400e8000)
    /lib/ld-linux-armhf.so.3 (0x4009e000)
    libnvrm.so => /usr/lib/libnvrm.so (0x4010d000)
    libnvrm_graphics.so => /usr/lib/libnvrm_graphics.so (0x40127000)
    libnvos.so => /usr/lib/libnvos.so (0x4007c000)
    libnvddk_2d.so => /usr/lib/libnvddk_2d.so (0x411e3000)
    libardrv_dynamic.so => /usr/lib/libardrv_dynamic.so (0x4120a000)
    libicudata.so.54 => /usr/lib/libicudata.so.54 (0x4121e000)
    libX11.so.6 => /usr/lib/libX11.so.6 (0x42a49000)
    libXext.so.6 => /usr/lib/libXext.so.6 (0x40016000)
    libxcb.so.1 => /usr/lib/libxcb.so.1 (0x42b2a000)
    libXau.so.6 => /usr/lib/libXau.so.6 (0x40077000)
    libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x4000a000)

No changes have been made to the source code except for the change of specifying the absolute path where cube.png or .glsl files should be loaded which in my case is /home/root.

I have no knowledge of OpenGL itself. Can anyone perhaps point as to what might be the probable cause. As far as I can tell, the libraries are linked correctly.

Thanks & Regards,
Sanchayan Maity.