Help!! app qt4 upgrade to qt5 for wayland , can't get the QDialog's window handle which can cast to EGLNativeWindowType

[Giulio Camuffo]

2014-08-06 11:54 GMT+03:00 Steve (YiLiang) Zhou <szhou at telecomsys.com>:

> Dear all,
>
> I have app which was developed by qt4, and we want to port it to tizen ivi
> wayland platform, so I have to update our app to qt5.
>
> We have a feature : drawing something based on egl on a qt window(we use
> QDialog).
>
> Egl need a EGLSurface and a EGLDisplay to get the feature work.
>
> EGLSurface *eglCreateWindowSurface*(
>
> EGLDisplay *display*,
>
>
>
> EGLConfig *config*,
>
>
>
> NativeWindowType *native_window*,
>
>
>
> EGLint const * *attrib_list*);
>
> In x11 based OS like ubuntu 12.04 , we use EGL_DEFAULT_DISPLAY to get
> display, the qt window’s winId()   to cast to NativeWindowType
>
> It works well on X11 based OS.
>
> But when it comes to wayland ,it will crash at *eglCreateWindowSurface**,
> *I googled a lot ,but rarely got something useful.
>
> Someone said that  to get *eglCreateWindowSurface* work on wayland ,the
> native_window has to be a wl_egl_window type.
>
> I tried to get it like bellow:
>
>
>
> *QDialog *dialog = new QDialog(mainW);*
>
> *dialog->setGeometry(QRect(0, 0, 720, 430));*
>
> *dialog->show();*
>
>
>
> * QPlatformNativeInterface *native =*
>
> *        QGuiApplication::platformNativeInterface();*
>
> *   struct wl_display *wl_dpy = (struct wl_display *)*
>
> *        native->nativeResourceForWindow("display", NULL);*
>
> *    struct wl_surface *surface = static_cast<struct wl_surface *>(*
>
> *        native->nativeResourceForWindow("surface",
> dialog->windowHandle()));*
>
> *struct wl_egl_window * wl_wind = wl_egl_window_create(surface, 720,430 );*
>
>
>
> use the wl_wind and wl_dpy to eglCreateWindowSurface , the app didn’t
> crash ,but the graphics we want to draw on the window can’t be seen.
>
>
>
> Is there someone met this before? Can somebody give some advices?
>

QDialog doesn't draw using OpenGL, so there is no EGL surface attached to
its wl_surface.
I'm not sure what you're trying to achieve. Do you want to embed an OpenGL
surface into QDialog? Or do you just want an egl surface to draw into, with
no QWidgets on top?

--
Giulio


>
>
>
>
> Thanks and Best Regards
>
> Steve Zhou
>
>
>
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