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Thread: Blank screen with Qt5.7 and EGLFS

  1. 5th October 2016, 10:04 #1
    danielesd
    danielesd is offline Beginner
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    Default Blank screen with Qt5.7 and EGLFS

    Hello!
    Im working on custom Hardware, related to Beaglebone black. I compiled everything cross from source.
    If I enable OpenGL and run an application, the screen turns black and nothing happens.
    Here are my steps and environments:

    Kernel:
    3.12.15-rt25 (A testing 4.6.7 kernel behaves similar. Let me know, if you need kernel config or device tree options)


    Steps to compile Qt:
    Qt Code: 
    1. wget http://download.qt.io/official_releases/qt/5.7/5.7.0/single/qt-everywhere-opensource-src-5.7.0.tar.gz
    2. tar xf qt-everywhere-opensource-src-5.7.0.tar.gz
    3. cd qt-everywhere-opensource-src-5.7.0
    4. cat ../0001-patched-to-build-with-ELDK-5.3-and-Graphics_SDK_5_01.patch | patch -p1
    5. cd ..
    6. mkdir qt-everywhere-opensource-src-5.7.0-build
    7. cd qt-everywhere-opensource-src-5.7.0-build
    8.  
    9. export ARCH=arm
    10. export CROSS_COMPILE=armv7a-
    11. export PATH=/opt/eldk-5.3/armv7a/sysroots/i686-eldk-linux/usr/bin:/opt/eldk-5.3/armv7a/sysroots/i686-eldk-linux/usr/bin/armv7a-vfp-neon-linux-gnueabi:$PATH
    12.  
    13. ../qt-everywhere-opensource-src-5.7.0/configure -opensource -confirm-license -prefix /opt/qt-embedded-v5.7.0-armv7a -platform linux-g++-64 -xplatform devices/linux-beagleboard-g++ -device beagleboard -device-option CROSS_COMPILE=/opt/eldk-5.3/armv7a/sysroots/i686-eldk-linux/usr/bin/armv7a-vfp-neon-linux-gnueabi/armv7a- -nomake examples -no-sse2 -no-glib -no-cups -no-largefile -no-accessibility -no-pch -qt-libpng -qt-libjpeg -tslib -linuxfb -no-xcb -I$PWD/../../../packages/tslib-1.0/src -I/opt/Graphics_SDK_5_01_01_02/include/OGLES2/ -L$PWD/../../../packages/tslib-1.0/src/.libs -L/tftpboot/hh300/linux/rootfs/usr/lib -opengl -pkg-config -v
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    0001-patched-to-build-with-ELDK-5.3-and-Graphics_SDK_5_01.patch:
    Qt Code: 
    1. diff --git a/qtbase/mkspecs/common/g++-base.conf b/qtbase/mkspecs/common/g++-base.conf
    2. index c42c46b..ae22071 100644
    3. --- a/qtbase/mkspecs/common/g++-base.conf
    4. +++ b/qtbase/mkspecs/common/g++-base.conf
    5. @@ -27,7 +27,7 @@ QMAKE_CFLAGS_USE_PRECOMPILE   = -include ${QMAKE_PCH_OUTPUT_BASE}
    6.  QMAKE_CXXFLAGS_PRECOMPILE     = -x c++-header -c ${QMAKE_PCH_INPUT} -o ${QMAKE_PCH_OUTPUT}
    7.  QMAKE_CXXFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE
    8.  
    9. -QMAKE_CXXFLAGS_CXX11    = -std=c++11
    10. +QMAKE_CXXFLAGS_CXX11    = -std=c++0x
    11.  QMAKE_CXXFLAGS_CXX14    = -std=c++1y
    12.  QMAKE_CXXFLAGS_CXX1Z    = -std=c++1z
    13.  QMAKE_CXXFLAGS_GNUCXX11 = -std=gnu++11
    14. diff --git a/qtbase/mkspecs/devices/linux-beagleboard-g++/qmake.conf b/qtbase/mkspecs/devices/linux-beagleboard-g++/qmake.conf
    15. index 604da50..9d8db69 100644
    16. --- a/qtbase/mkspecs/devices/linux-beagleboard-g++/qmake.conf
    17. +++ b/qtbase/mkspecs/devices/linux-beagleboard-g++/qmake.conf
    18. @@ -36,8 +36,8 @@ QMAKE_CXXFLAGS_RELEASE += -O3
    19.  QMAKE_LIBS             += -lrt -lpthread -ldl
    20.  
    21.  # Extra stuff (OpenGL, DirectFB, ...)
    22. -QMAKE_INCDIR_EGL        =
    23. -QMAKE_LIBDIR_EGL        =
    24. +QMAKE_INCDIR_EGL        = /opt/Graphics_SDK_5_01_01_02/include
    25. +QMAKE_LIBDIR_EGL        = /opt/gfxlibraries/gfx_rel_es8.x
    26.  QMAKE_INCDIR_OPENGL_ES2 = $${QMAKE_INCDIR_EGL}
    27.  QMAKE_LIBDIR_OPENGL_ES2 = $${QMAKE_LIBDIR_EGL}
    28.  QMAKE_INCDIR_OPENVG     = $${QMAKE_INCDIR_EGL}
    29. @@ -47,7 +47,7 @@ QMAKE_LIBS_EGL          = -lEGL -lIMGegl -lsrv_um
    30.  QMAKE_LIBS_OPENGL_ES2   = -lGLESv2 $${QMAKE_LIBS_EGL}
    31.  QMAKE_LIBS_OPENVG       = -lOpenVG $${QMAKE_LIBS_EGL}
    32.  
    33. -DISTRO_OPTS += hard-float
    34. +#DISTRO_OPTS += hard-float
    35.  
    36.  # No need for any special EGL device integration.
    37.  # Prioritize the default, compiled-in integration over any plugins.
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    Configurte output:
    Qt Code: 
    1. Build options:
    2.   Configuration .......... audio-backend c++11 clock-gettime clock-monotonic compile_examples concurrent cross_compile dbus doubleconversion egl eglfs enable_new_dtags evdev eventfd freetype full-config getaddrinfo getifaddrs harfbuzz iconv inotify ipv6ifname large-config libudev linuxfb medium-config minimal-config mremap neon nis opengl opengles2 openssl pcre png poll_poll posix_fallocate qpa qpa reduce_exports release rpath shared small-config system-zlib threadsafe-cloexec tslib xinput2 xlib xrender
    3.   Build parts ............ libs
    4.   Mode ................... release
    5.   Using sanitizer(s)...... none
    6.   Using C++ standard ..... c++11
    7.   Using gold linker....... no
    8.   Using new DTAGS ........ yes
    9.   Using PCH .............. no
    10.   Using LTCG ............. no
    11.   Target compiler supports:
    12.     Neon ................. yes
    13.  
    14. Qt modules and options:
    15.   Qt D-Bus ............... yes (loading dbus-1 at runtime)
    16.   Qt Concurrent .......... yes
    17.   Qt GUI ................. yes
    18.   Qt Widgets ............. yes
    19.   Large File ............. no
    20.   QML debugging .......... yes
    21.   Use system proxies ..... no
    22.  
    23. Support enabled for:
    24.   Accessibility .......... no
    25.   ALSA ................... no
    26.   CUPS ................... no
    27.   DoubleConversion........ yes (bundled copy)
    28.   Evdev .................. yes
    29.   FontConfig ............. no
    30.   FreeType ............... yes (bundled copy)
    31.   Glib ................... no
    32.   GStreamer .............. no
    33.   GTK platformtheme ...... no
    34.   HarfBuzz ............... yes (bundled copy)
    35.   Iconv .................. yes
    36.   ICU .................... no
    37.   Image formats:
    38.     GIF .................. yes (plugin, using bundled copy)
    39.     JPEG ................. yes (plugin, using bundled copy)
    40.     PNG .................. yes (in QtGui, using bundled copy)
    41.   libinput................ no
    42.   Logging backends:
    43.     journald ............... no
    44.     syslog   ............... no
    45.   mtdev .................. no
    46.   Networking:
    47.     getaddrinfo .......... yes
    48.     getifaddrs ........... yes
    49.     IPv6 ifname .......... yes
    50.     libproxy.............. no
    51.     OpenSSL .............. yes (loading libraries at run-time)
    52.   NIS .................... yes
    53.   OpenGL / OpenVG:
    54.     EGL .................. yes
    55.     OpenGL ............... yes (OpenGL ES 2.0+)
    56.     OpenVG ............... no
    57.   PCRE ................... yes (bundled copy)
    58.   pkg-config ............. yes
    59.   PulseAudio ............. no
    60.   QPA backends:
    61.     DirectFB ............. no
    62.     EGLFS ................ yes
    63.       EGLFS i.MX6 ........ no
    64.       EGLFS i.MX6 Wayland. no
    65.       EGLFS EGLDevice .... no
    66.       EGLFS GBM .......... no
    67.       EGLFS Mali ......... no
    68.       EGLFS Raspberry Pi . no
    69.       EGLFS X11 .......... no
    70.     LinuxFB .............. yes
    71.     Mir client............ no
    72.     XCB .................. no
    73.   Session management ..... yes
    74.   SQL drivers:
    75.     DB2 .................. no
    76.     InterBase ............ no
    77.     MySQL ................ no
    78.     OCI .................. no
    79.     ODBC ................. no
    80.     PostgreSQL ........... no
    81.     SQLite 2 ............. no
    82.     SQLite ............... yes (plugin, using bundled copy)
    83.     TDS .................. no
    84.   tslib .................. yes
    85.   udev ................... yes
    86.   xkbcommon-x11........... no
    87.   xkbcommon-evdev......... no
    88.   zlib ................... yes (system library)
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    Target environment (shorted):
    Qt Code: 
    1. TSLIB_CONFFILE=/etc/ts.conf
    2. POINTERCAL_FILE=/app/pointercal
    3. TSLIB_CALIBFILE=/app/pointercal
    4. LD_LIBRARY_PATH=/opt/qt-embedded-v5.7.0-armv7a/lib:/opt/qt-embedded-v5.7.0-armv7a/plugins/platforms/
    5. QWS_MOUSE_PROTO=Tslib:/dev/input/by-path/platform-44e0b000.i2c-event-mouse
    6. PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
    7. QTARGS=--platform eglfs -plugin tslib
    8. TSLIB_TSDEVICE=/dev/input/by-path/platform-44e0b000.i2c-event-mouse
    9. QWS_DISPLAY=Multi: LinuxFb: VNC::size=1024x768
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    ldd on hellogl2 example:
    Qt Code: 
    1. root@ppc3xx:/app# ldd hellogl2
    2.         libQt5Widgets.so.5 => /opt/qt-embedded-v5.7.0-armv7a/lib/libQt5Widgets.so.5 (0xb6b99000)
    3.         libQt5Gui.so.5 => /opt/qt-embedded-v5.7.0-armv7a/lib/libQt5Gui.so.5 (0xb683d000)
    4.         libQt5Core.so.5 => /opt/qt-embedded-v5.7.0-armv7a/lib/libQt5Core.so.5 (0xb6429000)
    5.         librt.so.1 => /lib/librt.so.1 (0x4b9d8000)
    6.         libdl.so.2 => /lib/libdl.so.2 (0x4b840000)
    7.         libGLESv2.so => /usr/lib/libGLESv2.so (0xb63b4000)
    8.         libEGL.so => /usr/lib/libEGL.so (0xb63a9000)
    9.         libIMGegl.so => /usr/lib/libIMGegl.so (0xb638f000)
    10.         libsrv_um.so => /usr/lib/libsrv_um.so (0xb635c000)
    11.         libpthread.so.0 => /lib/libpthread.so.0 (0x4b9b0000)
    12.         libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x4ba88000)
    13.         libm.so.6 => /lib/libm.so.6 (0x4ba10000)
    14.         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x4b988000)
    15.         libc.so.6 => /lib/libc.so.6 (0x4b850000)
    16.         libz.so.1 => /usr/lib/libz.so.1 (0x4b9f0000)
    17.         /lib/ld-linux.so.3 (0x4b810000)
    18.         ld-linux-armhf.so.3 => /lib/ld-linux-armhf.so.3 (0xb6333000)
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    (Why doesn't it depend on libQt5OpenGL.so.5?)


    starting hellogl2 example:
    Qt Code: 
    1. root@ppc3xx:/app# ./hellogl2
    2. QIconvCodec::convertToUnicode: using Latin-1 for conversion, iconv_open failed
    3. QIconvCodec::convertFromUnicode: using Latin-1 for conversion, iconv_open failed
    4. Unable to query physical screen size, defaulting to 100 dpi.
    5. To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).
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    At this point, nothing else happens and Display tungs black.
    Let me know, if you need any more infos to solve the problem.

    Kind Regards, Daniel
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  2. 15th November 2016, 12:41 #2
    oldFox64
    oldFox64 is offline Beginner
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    Default Re: Blank screen with Qt5.7 and EGLFS

    You have 2 platform plugins there: LinuxFB and EGLFS. Maybe they are in conflict or ur application is trying to launch with LinuxFB instead of eglfs. But do not pay me much attention, I'm also having troubles to run eglfs getting "Could not open egl display" error
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