Blank screen with Qt5.7 and EGLFS

[danielesd]

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:

wget http://download.qt.io/official_releases/qt/5.7/5.7.0/single/qt-everywhere-opensource-src-5.7.0.tar.gz
tar xf qt-everywhere-opensource-src-5.7.0.tar.gz
cd qt-everywhere-opensource-src-5.7.0
cat ../0001-patched-to-build-with-ELDK-5.3-and-Graphics_SDK_5_01.patch | patch -p1
cd ..
mkdir qt-everywhere-opensource-src-5.7.0-build
cd qt-everywhere-opensource-src-5.7.0-build

export ARCH=arm
export CROSS_COMPILE=armv7a-
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

../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/linux/rootfs/usr/lib -opengl -pkg-config -v

0001-patched-to-build-with-ELDK-5.3-and-Graphics_SDK_5_01.patch:

diff --git a/qtbase/mkspecs/common/g++-base.conf b/qtbase/mkspecs/common/g++-base.conf
index c42c46b..ae22071 100644
--- a/qtbase/mkspecs/common/g++-base.conf
+++ b/qtbase/mkspecs/common/g++-base.conf
@@ -27,7 +27,7 @@ QMAKE_CFLAGS_USE_PRECOMPILE   = -include ${QMAKE_PCH_OUTPUT_BASE}
 QMAKE_CXXFLAGS_PRECOMPILE     = -x c++-header -c ${QMAKE_PCH_INPUT} -o ${QMAKE_PCH_OUTPUT}
 QMAKE_CXXFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE

-QMAKE_CXXFLAGS_CXX11    = -std=c++11
+QMAKE_CXXFLAGS_CXX11    = -std=c++0x
 QMAKE_CXXFLAGS_CXX14    = -std=c++1y
 QMAKE_CXXFLAGS_CXX1Z    = -std=c++1z
 QMAKE_CXXFLAGS_GNUCXX11 = -std=gnu++11
diff --git a/qtbase/mkspecs/devices/linux-beagleboard-g++/qmake.conf b/qtbase/mkspecs/devices/linux-beagleboard-g++/qmake.conf
index 604da50..9d8db69 100644
--- a/qtbase/mkspecs/devices/linux-beagleboard-g++/qmake.conf
+++ b/qtbase/mkspecs/devices/linux-beagleboard-g++/qmake.conf
@@ -36,8 +36,8 @@ QMAKE_CXXFLAGS_RELEASE += -O3
 QMAKE_LIBS             += -lrt -lpthread -ldl

 # Extra stuff (OpenGL, DirectFB, ...)
-QMAKE_INCDIR_EGL        =
-QMAKE_LIBDIR_EGL        =
+QMAKE_INCDIR_EGL        = /opt/Graphics_SDK_5_01_01_02/include
+QMAKE_LIBDIR_EGL        = /opt/gfxlibraries/gfx_rel_es8.x
 QMAKE_INCDIR_OPENGL_ES2 = $${QMAKE_INCDIR_EGL}
 QMAKE_LIBDIR_OPENGL_ES2 = $${QMAKE_LIBDIR_EGL}
 QMAKE_INCDIR_OPENVG     = $${QMAKE_INCDIR_EGL}
@@ -47,7 +47,7 @@ QMAKE_LIBS_EGL          = -lEGL -lIMGegl -lsrv_um
 QMAKE_LIBS_OPENGL_ES2   = -lGLESv2 $${QMAKE_LIBS_EGL}
 QMAKE_LIBS_OPENVG       = -lOpenVG $${QMAKE_LIBS_EGL}

-DISTRO_OPTS += hard-float
+#DISTRO_OPTS += hard-float

 # No need for any special EGL device integration.
 # Prioritize the default, compiled-in integration over any plugins.
diff --git a/qtbase/src/corelib/global/qnumeric_p.h b/qtbase/src/corelib/global/qnumeric_p.h
index 5705bc2..d8bf403 100644
--- a/qtbase/src/corelib/global/qnumeric_p.h
+++ b/qtbase/src/corelib/global/qnumeric_p.h
@@ -71,12 +71,12 @@
 QT_BEGIN_NAMESPACE
 namespace qnumeric_std_wrapper {
 // the 'using namespace std' below is cases where the stdlib already put the math.h functions in the std namespace and undefined the macros.
-static inline bool math_h_isnan(double d) { using namespace std; return isnan(d); }
-static inline bool math_h_isinf(double d) { using namespace std; return isinf(d); }
-static inline bool math_h_isfinite(double d) { using namespace std; return isfinite(d); }
-static inline bool math_h_isnan(float f) { using namespace std; return isnan(f); }
-static inline bool math_h_isinf(float f) { using namespace std; return isinf(f); }
-static inline bool math_h_isfinite(float f) { using namespace std; return isfinite(f); }
+static inline bool math_h_isnan(double d) { return std::isnan(d); }
+static inline bool math_h_isinf(double d) { return std::isinf(d); }
+static inline bool math_h_isfinite(double d) { return std::isfinite(d); }
+static inline bool math_h_isnan(float f) { return std::isnan(f); }
+static inline bool math_h_isinf(float f) { return std::isinf(f); }
+static inline bool math_h_isfinite(float f) { return std::isfinite(f); }
 }
 QT_END_NAMESPACE
 // These macros from math.h conflict with the real functions in the std namespace.

Configurte output:

Build options:
  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
  Build parts ............ libs
  Mode ................... release
  Using sanitizer(s)...... none
  Using C++ standard ..... c++11
  Using gold linker....... no
  Using new DTAGS ........ yes
  Using PCH .............. no
  Using LTCG ............. no
  Target compiler supports:
    Neon ................. yes

Qt modules and options:
  Qt D-Bus ............... yes (loading dbus-1 at runtime)
  Qt Concurrent .......... yes
  Qt GUI ................. yes
  Qt Widgets ............. yes
  Large File ............. no
  QML debugging .......... yes
  Use system proxies ..... no

Support enabled for:
  Accessibility .......... no
  ALSA ................... no
  CUPS ................... no
  DoubleConversion........ yes (bundled copy)
  Evdev .................. yes
  FontConfig ............. no
  FreeType ............... yes (bundled copy)
  Glib ................... no
  GStreamer .............. no
  GTK platformtheme ...... no
  HarfBuzz ............... yes (bundled copy)
  Iconv .................. yes
  ICU .................... no
  Image formats:
    GIF .................. yes (plugin, using bundled copy)
    JPEG ................. yes (plugin, using bundled copy)
    PNG .................. yes (in QtGui, using bundled copy)
  libinput................ no
  Logging backends:
    journald ............... no
    syslog   ............... no
  mtdev .................. no
  Networking:
    getaddrinfo .......... yes
    getifaddrs ........... yes
    IPv6 ifname .......... yes
    libproxy.............. no
    OpenSSL .............. yes (loading libraries at run-time)
  NIS .................... yes
  OpenGL / OpenVG:
    EGL .................. yes
    OpenGL ............... yes (OpenGL ES 2.0+)
    OpenVG ............... no
  PCRE ................... yes (bundled copy)
  pkg-config ............. yes
  PulseAudio ............. no
  QPA backends:
    DirectFB ............. no
    EGLFS ................ yes
      EGLFS i.MX6 ........ no
      EGLFS i.MX6 Wayland. no
      EGLFS EGLDevice .... no
      EGLFS GBM .......... no
      EGLFS Mali ......... no
      EGLFS Raspberry Pi . no
      EGLFS X11 .......... no
    LinuxFB .............. yes
    Mir client............ no
    XCB .................. no
  Session management ..... yes
  SQL drivers:
    DB2 .................. no
    InterBase ............ no
    MySQL ................ no
    OCI .................. no
    ODBC ................. no
    PostgreSQL ........... no
    SQLite 2 ............. no
    SQLite ............... yes (plugin, using bundled copy)
    TDS .................. no
  tslib .................. yes
  udev ................... yes
  xkbcommon-x11........... no
  xkbcommon-evdev......... no
  zlib ................... yes (system library)

Target environment (shorted):

TSLIB_CONFFILE=/etc/ts.conf
POINTERCAL_FILE=/app/pointercal
TSLIB_CALIBFILE=/app/pointercal
LD_LIBRARY_PATH=/opt/qt-embedded-v5.7.0-armv7a/lib:/opt/qt-embedded-v5.7.0-armv7a/plugins/platforms/
QWS_MOUSE_PROTO=Tslib:/dev/input/by-path/platform-44e0b000.i2c-event-mouse
PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
QTARGS=--platform eglfs -plugin tslib
TSLIB_TSDEVICE=/dev/input/by-path/platform-44e0b000.i2c-event-mouse
QWS_DISPLAY=Multi: LinuxFb: VNC::size=1024x768

ldd on hellogl2 example:

root@ppc3xx:/app# ldd hellogl2
        libQt5Widgets.so.5 => /opt/qt-embedded-v5.7.0-armv7a/lib/libQt5Widgets.so.5 (0xb6b99000)
        libQt5Gui.so.5 => /opt/qt-embedded-v5.7.0-armv7a/lib/libQt5Gui.so.5 (0xb683d000)
        libQt5Core.so.5 => /opt/qt-embedded-v5.7.0-armv7a/lib/libQt5Core.so.5 (0xb6429000)
        librt.so.1 => /lib/librt.so.1 (0x4b9d8000)
        libdl.so.2 => /lib/libdl.so.2 (0x4b840000)
        libGLESv2.so => /usr/lib/libGLESv2.so (0xb63b4000)
        libEGL.so => /usr/lib/libEGL.so (0xb63a9000)
        libIMGegl.so => /usr/lib/libIMGegl.so (0xb638f000)
        libsrv_um.so => /usr/lib/libsrv_um.so (0xb635c000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x4b9b0000)
        libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x4ba88000)
        libm.so.6 => /lib/libm.so.6 (0x4ba10000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x4b988000)
        libc.so.6 => /lib/libc.so.6 (0x4b850000)
        libz.so.1 => /usr/lib/libz.so.1 (0x4b9f0000)
        /lib/ld-linux.so.3 (0x4b810000)
        ld-linux-armhf.so.3 => /lib/ld-linux-armhf.so.3 (0xb6333000)

(Why doesn't it depend on libQt5OpenGL.so.5?)

starting hellogl2 example:

root@ppc3xx:/app# ./hellogl2
QIconvCodec::convertToUnicode: using Latin-1 for conversion, iconv_open failed
QIconvCodec::convertFromUnicode: using Latin-1 for conversion, iconv_open failed
Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).

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

[LyneR]

@danielesd It looks like you are using Qt5.7 and the QWS environment and I think instead with eglfs you should be using QPA environment settings. I am not an expert but I have recently brought up a custom platform using BBB with a touchscreen using qt5.6.1, kernel 4.1, and using QPA environment. QWA is for Qt4.x.

Here is a link that might get you pointed toward qpa: http://doc.qt.io/qt-5/embedded-linux.html