Qt 5.3.2 Application on Framebuffer

kDohmen

Hello,

I want to run an Qt Quick application on the framebuffer of my linux-board.

When I start the application it just outputs:
EGL Error : Could not create the egl surface: error = 0x300b

(crosspost: http://forum.odroid.com/viewtopic.php?f=82&t=6804&p=55111#p55111)

agocs

Because you have no platform-specific adaption for setting up EGL on fbdev with the Mali drivers.

Using the Beagleboard/bone approach will not work: There there is no device-specific adaptation needed. Other devices, like the Mali-based ones, will need some vendor-specific initialization to create the native "windows".

Take a look at the hix5hd2 makespecs at qtbase/mkspecs/devices/linux-arm-hisilicon-hix5hd2-g++. The eglfs hooks there are probably usable on any Mali-based board.

You could also try configuring with -device linux-arm-hisilicon-hix5hd2-g++ but be aware that this may break badly if the compiler flags are not what your board expects.

kDohmen

Thank you, it works :D

here my qmake.conf and qeglfshooks.cpp

qmake.conf

#
# qmake configuration for the odroid u2/u3 boards
# http://hardkernel.com/
# http://forum.odroid.com/viewtopic.php?f=9&t=1645
# http://qt-project.org/forums/viewthread/48704/


include(../common/linux_device_pre.conf)
EGLFS_PLATFORM_HOOKS_SOURCES = $$PWD/qeglfshooks_odroidu2.cpp

# Extra stuff (OpenGL, DirectFB, ...)
QMAKE_INCDIR_EGL        += $$[QT_SYSROOT]/usr/include
QMAKE_LIBDIR_EGL        += $$[QT_SYSROOT]/usr/lib/arm-linux-gnueabihf/mali-egl
QMAKE_INCDIR_OPENGL_ES2 += $$QMAKE_INCDIR_EGL
QMAKE_LIBDIR_OPENGL_ES2 += $$QMAKE_LIBDIR_EGL
QMAKE_INCDIR_OPENVG     += $$QMAKE_INCDIR_EGL
QMAKE_LIBDIR_OPENVG     += $$QMAKE_LIBDIR_EGL

QMAKE_LIBS_EGL  += -lMali
QMAKE_LIBS_OPENGL_ES2   += $$QMAKE_LIBS_EGL
QMAKE_LIBS_OPENVG       += $$QMAKE_LIBS_EGL

#modifications to gcc-base.conf
COMPILER_FLAGS  += -march=armv7-a -mcpu=cortex-a9 -mtune=cortex-a9 -mfpu=neon -mvectorize-with-neon-quad
DISTRO_OPTS   += hard-float
QMAKE_CXXFLAGS_RELEASE += -O3

include(../common/linux_arm_device_post.conf)

load(qt_config)

qeglfshooks_odroidu2.cpp (just the one from linux-arm-hisilicon-hix5hd2-g++)

#include "qeglfshooks.h"
#include <EGL/fbdev_window.h>

#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/fb.h>

#include <private/qcore_unix_p.h>

QT_BEGIN_NAMESPACE

class QEglFSOdroidHooks : public QEglFSHooks
{
private:
    void fbInit();
public:
    void platformInit() Q_DECL_OVERRIDE;
    EGLNativeWindowType createNativeWindow(QPlatformWindow *window, const QSize &size, const QSurfaceFormat &format) Q_DECL_OVERRIDE;
    void destroyNativeWindow(EGLNativeWindowType window) Q_DECL_OVERRIDE;
};

void QEglFSOdroidHooks::fbInit()
{
    int fd = qt_safe_open("/dev/fb0", O_RDWR, 0);
    if (fd == -1)
        qWarning("Failed to open fb to detect screen resolution!");

    struct fb_var_screeninfo vinfo;
    memset(&vinfo, 0, sizeof(vinfo));
    if (ioctl(fd, FBIOGET_VSCREENINFO, &vinfo) == -1)
        qWarning("Could not get variable screen info");

    vinfo.bits_per_pixel   = 32;
    vinfo.red.length       = 8;
    vinfo.green.length     = 8;
    vinfo.blue.length      = 8;
    vinfo.transp.length    = 8;
    vinfo.blue.offset      = 0;
    vinfo.green.offset     = 8;
    vinfo.red.offset       = 16;
    vinfo.transp.offset    = 24;
    vinfo.yres_virtual     = 2 * vinfo.yres;

    if (ioctl(fd, FBIOPUT_VSCREENINFO, &vinfo) == -1)
        qErrnoWarning(errno, "Unable to set double buffer mode!");

    qt_safe_close(fd);
    return;
}

void QEglFSOdroidHooks::platformInit()
{
    QEglFSHooks::platformInit();
    fbInit();
}

EGLNativeWindowType QEglFSOdroidHooks::createNativeWindow(QPlatformWindow *window, const QSize &size, const QSurfaceFormat &format)
{
    fbdev_window *fbwin = reinterpret_cast<fbdev_window *>(malloc(sizeof(fbdev_window)));
    if (NULL == fbwin)
        return 0;

    fbwin->width = size.width();
    fbwin->height = size.height();
    return (EGLNativeWindowType)fbwin;
}

void QEglFSOdroidHooks::destroyNativeWindow(EGLNativeWindowType window)
{
    free(window);
}

QEglFSOdroidHooks eglFSOdroidHooks;
QEglFSHooks *platformHooks = &eglFSOdroidHooks;

QT_END_NAMESPACE