application can't be displayed on embedded platform

Kechieh_wang

Hello:

I need to write a application via qml. And it will be execute on an embedded platform which didn't support opengl. So i export QMLSCENE_DEVICE=softwarecontext. But unfortunately it still can't display and no any error message output. I don't konw how to deal with it. My compile comand as follow:

./configure \
-v \
-confirm-license \
-prefix $PWD/../qt-5.9.9 \
-release \
-opensource \
-accessibility \
-make libs \
-xplatform linux-arm-gnueabihf-g++ \
-pch \
-sql-sqlite \
-qt-libjpeg \
-qt-zlib \
-opengl es2 \
-nomake examples \
-nomake tools \
-nomake tests \
-skip qt3d -skip qtactiveqt -skip qtandroidextras -skip qtcanvas3d -skip qtcharts -skip qtconnectivity -skip qtdatavis3d -skip qtdoc -skip qtgamepad -skip qtgraphicaleffects -skip qtlocation -skip qtmacextras -skip qtpurchasing  -skip qtremoteobjects -skip qtscript -skip qtscxml -skip qtsensors -skip qtserialbus -skip qtserialport -skip qtspeech -skip qttools -skip qttranslations -skip qtwayland -skip qtwebchannel -skip qtwebsockets -skip qtwebview -skip qtwinextras -skip qtxmlpatterns -skip qtwebengine

and the output is follow:

Configure summary:

Building on: linux-g++ (x86_64, CPU features: mmx sse sse2)
Building for: linux-arm-gnueabihf-g++ (arm, CPU features: <none>)
Configuration: cross_compile use_gold_linker compile_examples enable_new_dtags largefile precompile_header shared rpath release c++11 c++14 c++1z concurrent dbus no-pkg-config reduce_exports stl
Build options:
  Mode ................................... release
  Optimize release build for size ........ no
  Building shared libraries .............. yes
  Using C++ standard ..................... C++1z
  Using ccache ........................... no
  Using gold linker ...................... yes
  Using new DTAGS ........................ yes
  Using precompiled headers .............. yes
  Using LTCG ............................. no
  Target compiler supports:
    NEON ................................. no
  Build parts ............................ libs
Qt modules and options:
  Qt Concurrent .......................... yes
  Qt D-Bus ............................... yes
  Qt D-Bus directly linked to libdbus .... no
  Qt Gui ................................. yes
  Qt Network ............................. yes
  Qt Sql ................................. yes
  Qt Testlib ............................. yes
  Qt Widgets ............................. yes
  Qt Xml ................................. yes
Support enabled for:
  Using pkg-config ....................... no
  QML debugging .......................... yes
  udev ................................... no
  Using system zlib ...................... no
Qt Core:
  DoubleConversion ....................... yes
    Using system DoubleConversion ........ no
  GLib ................................... no
  iconv .................................. yes
  ICU .................................... no
  Logging backends:
    journald ............................. no
    syslog ............................... no
    slog2 ................................ no
  Using system PCRE2 ..................... no
Qt Network:
  getaddrinfo() .......................... yes
  getifaddrs() ........................... yes
  IPv6 ifname ............................ yes
  libproxy ............................... no
  OpenSSL ................................ no
    Qt directly linked to OpenSSL ........ no
  SCTP ................................... no
  Use system proxies ..................... yes
Qt Gui:
  Accessibility .......................... yes
  FreeType ............................... yes
    Using system FreeType ................ no
  HarfBuzz ............................... yes
    Using system HarfBuzz ................ no
  Fontconfig ............................. no
  Image formats:
    GIF .................................. yes
    ICO .................................. yes
    JPEG ................................. yes
      Using system libjpeg ............... no
    PNG .................................. yes
      Using system libpng ................ no
  EGL .................................... yes
  OpenVG ................................. no
  OpenGL:
    Desktop OpenGL ....................... no
    OpenGL ES 2.0 ........................ yes
    OpenGL ES 3.0 ........................ yes
    OpenGL ES 3.1 ........................ yes
  Session Management ..................... yes
Features used by QPA backends:
  evdev .................................. yes
  libinput ............................... no
  INTEGRITY HID .......................... no
  mtdev .................................. no
  tslib .................................. no
  xkbcommon-evdev ........................ no
QPA backends:
  DirectFB ............................... no
  EGLFS .................................. yes
  EGLFS details:
    EGLFS OpenWFD ........................ no
    EGLFS i.Mx6 .......................... no
    EGLFS i.Mx6 Wayland .................. no
    EGLFS RCAR ........................... no
    EGLFS EGLDevice ...................... no
    EGLFS GBM ............................ no
    EGLFS Mali ........................... no
    EGLFS Raspberry Pi ................... no
    EGL on X11 ........................... no
  LinuxFB ................................ yes
  VNC .................................... yes
  Mir client ............................. no
Qt Widgets:
  GTK+ ................................... no
  Styles ................................. Fusion Windows
Qt PrintSupport:
  CUPS ................................... no
Qt Sql:
  DB2 (IBM) .............................. no
  InterBase .............................. no
  MySql .................................. no
  OCI (Oracle) ........................... no
  ODBC ................................... no
  PostgreSQL ............................. no
  SQLite2 ................................ no
  SQLite ................................. yes
    Using system provided SQLite ......... no
  TDS (Sybase) ........................... no
Qt QML:
  QML interpreter ........................ yes
  QML network support .................... yes
Qt Quick:
  Direct3D 12 ............................ no
  AnimatedImage item ..................... yes
  Canvas item ............................ yes
  Support for Qt Quick Designer .......... yes
  Flipable item .......................... yes
  GridView item .......................... yes
  ListView item .......................... yes
  Path support ........................... yes
  PathView item .......................... yes
  Positioner items ....................... yes
  ShaderEffect item ...................... yes
  Sprite item ............................ yes
Qt Multimedia:
  ALSA ................................... no
  GStreamer 1.0 .......................... no
  GStreamer 0.10 ......................... no
  Video for Linux ........................ yes
  OpenAL ................................. no
  PulseAudio ............................. no
  Resource Policy (libresourceqt5) ....... no
  Windows Audio Services ................. no
  DirectShow ............................. no
  Windows Media Foundation ............... no

my qmake.conf is follow:

#
# qmake configuration for building with arm-linux-gnueabihf-g++
#

MAKEFILE_GENERATOR      = UNIX
CONFIG                 += incremental
QMAKE_INCREMENTAL_STYLE = sublib
QMAKE_CFLAGS_RELEASE += -O2 -march=armv7-a
QMAKE_CXXFLAGS_RELEASE += -O2 -march=armv7-a

include(../common/linux.conf)
include(../common/gcc-base-unix.conf)
include(../common/g++-unix.conf)



QMAKE_INCDIR_OPENGL_ES2 = /home/parallels/cross/opengllb/include
QMAKE_LIBDIR_OPENGL_ES2 = /home/parallels/cross/opengllb/lib
QMAKE_LIBS_OPENGL_ES2 = -lglapi -lGLESv2 -lEGL
QMAKE_LIBS_EGL         += -lEGL 
QMAKE_INCDIR_EGL = /home/parallels/cross/opengllb/include
QMAKE_LIBDIR_EGL = /home/parallels/cross/opengllb/lib

# modifications to g++.conf
QMAKE_CC                = arm-linux-gnueabihf-gcc
QMAKE_CXX               = arm-linux-gnueabihf-g++
QMAKE_LINK              = arm-linux-gnueabihf-g++
QMAKE_LINK_SHLIB        = arm-linux-gnueabihf-g++

# modifications to linux.conf
QMAKE_AR                = arm-linux-gnueabihf-ar cqs
QMAKE_OBJCOPY           = arm-linux-gnueabihf-objcopy
QMAKE_NM                = arm-linux-gnueabihf-nm -P
QMAKE_STRIP             = arm-linux-gnueabihf-strip
load(qt_config)

when i try to execute it, it will output as follow:

QML debugging is enabled. Only use this in a safe environment.

can anyone help me ?

sierdzio

Have you followed the installation guide for Qt Quick 2D renderer? https://doc.qt.io/QtQuick2DRenderer/qtquick2drenderer-installation-guide.html

Kechieh_wang

Yeah, I have read this guide, but something confused me. What I did was a little different from the guide

sysroot means for my located of my embedded device? I didn't set this parameter when i cross compile qt source code.

Set up your build environment by defining where your compiler and sysroot are located:

I‘m confused for this step. What mean of build Qt module? I have completed cross compile the qt source code, is this step included in it? Or this step refers to build my application?

Build Qt Quick 2D Renderer like any other Qt module

I'm new to qt, sorry for my stupid question :-(

jsulm

@Kechieh_wang said in application can't be displayed on embedded platform:

sysroot means for my located of my embedded device?

It is basically the file system of your device. Without sysroot you can't cross compile. You simply copy the content of your device file system to some location on your host machine (for example using rsync).

sierdzio

@Kechieh_wang said in application can't be displayed on embedded platform:

Yeah, I have read this guide, but something confused me. What I did was a little different from the guide

sysroot means for my located of my embedded device? I didn't set this parameter when i cross compile qt source code.

Yes it's usually a local copy of your system folders. Used by cross-compiler to find system headers and link to system libraries.

Set up your build environment by defining where your compiler and sysroot are located:

I‘m confused for this step. What mean of build Qt module? I have completed cross compile the qt source code, is this step included in it? Or this step refers to build my application?

If you use qmake from your cross-compiled Qt then it will pick up correct systroot and compiler automatically.

What mean of build Qt module

You need to build the 2d Renderer module (as described in the doc). This is a module in Qt source code. So it's not about your app. Go back to your Qt build and apply these build instructions there. Don't forget to run make install and (if necessary) copy the Qt installation to your embedded device. Then you can try to run your app again.

Build Qt Quick 2D Renderer like any other Qt module

I'm new to qt, sorry for my stupid question :-(

And you are starting with an embedded board without OpenGL? That's pretty brave :-)

Kechieh_wang

@sierdzio

You need to build the 2d Renderer module (as described in the doc). This is a module in Qt source code. So it's not about your app. Go back to your Qt build and apply these build instructions there. Don't forget to run make install and (if necessary) copy the Qt installation to your embedded device. Then you can try to run your app again.

Just to confirm again, is 2d Renderer module the submodule of qtdeclarative? I didn't find this modle in the source code :-(

sierdzio

@Kechieh_wang said in application can't be displayed on embedded platform:

@sierdzio

You need to build the 2d Renderer module (as described in the doc). This is a module in Qt source code. So it's not about your app. Go back to your Qt build and apply these build instructions there. Don't forget to run make install and (if necessary) copy the Qt installation to your embedded device. Then you can try to run your app again.

Just to confirm again, is 2d Renderer module the submodule of qtdeclarative? I didn't find this modle in the source code :-(

I have no idea. I think it's only available in commercial license, but maybe I'm wrong.

Kechieh_wang

@sierdzio Ok, i see, I'm using open source. Maybe I need to change a deviece or try to use qwidget. Thanks for your patience.

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