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

Wed Aug 6 03:58:43 PDT 2014

Thanks very much for your help ,I will try it tomorrow!

Thanks and Best Regards

Steve Zhou

From: Giulio Camuffo [mailto:giuliocamuffo at gmail.com] 
Sent: Wednesday, August 06, 2014 6:37 PM
To: Steve (YiLiang) Zhou
Cc: wayland mailing list
Subject: Re: Help!! app qt4 upgrade to qt5 for wayland , can't get the QDialog's window handle which can cast to EGLNativeWindowType

2014-08-06 13:31 GMT+03:00 Steve (YiLiang) Zhou <szhou at telecomsys.com>:

So , if I want to draw something in a qwidget in wayland , it’s impossible to do this now?

You can do it, just not with OpenGL.

	Can you give some advices if I chose “ an egl surface to draw into, with no QWidgets on top “ ?

Well, you can create a QWindow and use a QOpenGLContext, and that will work fine. Then you draw the content with OpenGL calls.

	Thanks and Best Regards

	Steve Zhou

	From: Giulio Camuffo [mailto:giuliocamuffo at gmail.com] 
	Sent: Wednesday, August 06, 2014 5:52 PM

	To: Steve (YiLiang) Zhou
	Cc: wayland mailing list
	Subject: Re: Help!! app qt4 upgrade to qt5 for wayland , can't get the QDialog's window handle which can cast to EGLNativeWindowType

	2014-08-06 12:38 GMT+03:00 Steve (YiLiang) Zhou <szhou at telecomsys.com>:

	Thanks for your quick reply ,  I prefer to  embed an OpenGL surface into QDialog .

	That is unfortunately not possible yet. The QtWayland QPA doesn't have support for wl_subsurface yet, which are needed to embed an EGL surface into an shm one.

	--

	Giulio

		Thanks and Best Regards

		Steve Zhou

		From: Giulio Camuffo [mailto:giuliocamuffo at gmail.com] 
		Sent: Wednesday, August 06, 2014 5:34 PM
		To: Steve (YiLiang) Zhou
		Cc: wayland mailing list
		Subject: Re: Help!! app qt4 upgrade to qt5 for wayland , can't get the QDialog's window handle which can cast to EGLNativeWindowType

		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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