Howto configure qtbase from QT5.7 to use OpenGL ES 2.0 instead of desktop GL

Technical Support
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1

Hi,

I took the LinuxImageV2.6 and replaced meta-qt5 (QT 5.5) with the current one from github (QT 5.7).

Everything compiled successfully and the image works but I’m having a problem getting qtquick programs to work.

Every program crashes on startup with the message:

Cannot find EGLConfig, returning null config
Unable to find an X11 visual which matches EGL config 0

I think this is because the qt library and all programs that use it are linked against libGL instead of libGLESv2.

ldd gives this (output from a QT program):

libGL.so.1 => /usr/lib/libGL.so.1 (0x40d64000)

but I think it should be like this (output from a testprogram that does not use QT):

libEGL.so.1 => /usr/lib/libEGL.so.1 (0x40077000)
libGLESv2.so.2 => /usr/lib/libGLESv2.so.2 (0x40234000)

The qtbase configure from qt-meta(5.5) shows this:

OpenGL / OpenVG: 
    EGL .................. yes
    OpenGL ............... yes (OpenGL ES 2.0+)
    OpenVG ............... no

The configure from (5.7) shows this though:

OpenGL / OpenVG: 
    EGL .................. yes
    OpenGL ............... desktop
    OpenVG ............... no

The file stuff/meta-toradex/recipes-qt/qt5/qtbase_%.bbappend
contains the line:

PACKAGECONFIG_GL_tegra = "gles2"

The image is built for a Colibri-T30.

Does anyone know why qtbase configure chooses desktop gl instead of gles2?

2

Sorry, but we currently use Jethro which is at Qt version 5.5 level. Please also note that the Qt licensing changed which may or may not be acceptable to you.