Qt Quick Renderer 2D

Andrey Shmelew

@SGaist
Hello all!

there is a Qt Quick 2D Renderer, that works instead OpnGL ES 2 on boards without GPU,for example, BeagleBone Black , seems to be good for me.
As described, i should use :
export QMLSCENE_DEVICE=softwarecontext
but i have no idea what does this string mean.
can someone please help me to disable opengl for qt quick?
Any thoughts?

jsulm

@Andrey-Shmelew I explained this in another thread. Just execute that line before you start your application:

export QMLSCENE_DEVICE=softwarecontext
./my_app

Andrey Shmelew

@jsulm ```

root@beaglebone:/media/rootfs/media# export QMLSCENE_DEVICE=softwarecontext
root@beaglebone:/media/rootfs/media# ./noopengl 
failed to get the current screen resources
xkbcommon: ERROR: failed to add default include path auto
Qt: Failed to create XKB context!
Use QT_XKB_CONFIG_ROOT environmental variable to provide an additional search path, add ':' as separator to provi
de several search paths and/or make sure that XKB configuration data directory contains recent enough contents, t
o update please see http://cgit.freedesktop.org/xkeyboard-config/ .
QXcbConnection: XCB error: 170 (Unknown), sequence: 156, resource id: 90, major code: 146 (Unknown), minor code: 
20
QXcbIntegration: Cannot create platform OpenGL context, neither GLX nor EGL are enabled
Failed to create OpenGL context for format QSurfaceFormat(version 2.0, options QFlags(), depthBufferSize 24, redB
ufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize -1, stencilBufferSize 8, samples -1, swapBeh
avior 2, swapInterval 1, profile  0) 
Aborted

what is wrong?

jsulm

@Andrey-Shmelew Probably you do not have Qt Quick 2D Renderer. See here how to build and use it: http://doc.qt.io/QtQuick2DRenderer/qtquick2drenderer-installation-guide.html

Andrey Shmelew

@jsulm
I do not get you. These instructions need to execute directly on the BBB, or on a machine where installed qtcreator?

jsulm

@Andrey-Shmelew On your host machine since you're cross-compiling

Andrey Shmelew

@jsulm said in Qt Quick Renderer 2D:

not exactly understand.
Do you mean i can build Qt Quick 2D Renderer only before QT cross-compiling, so i need to rebuild my QT again?

jsulm

@Andrey-Shmelew If you used -opengl es2 to build Qt then no need to rebuild it, else you need to rebuild Qt with -opengl es2 (described in the link I posted).

Andrey Shmelew

@jsulm
if i can build and run qtquick 2.0 application on my machine, it means that QT already supports OpenGL and i can skip Building Qt Quick 2D Renderer, and as stated:

Build Qt Quick 2D Renderer like any other Qt module:

qmake
make
make install

sorry for the annoyance

jsulm

@Andrey-Shmelew You need it for BBB not your host PC right? Whether Qt supports OpenGL on your host PC or not is completely irrelevant for BBB. Isn't the absence of OpenGL on BBB the reason you want to have Qt Quick 2D Renderer?
So, the question is: did you build your BBB Qt with -opengl es2 ?

Andrey Shmelew

@jsulm said in Qt Quick Renderer 2D:

did you build your BBB Qt with -opengl es2 ?

i don't really know...

Andrey Shmelew

@jsulm

so after tons hours of googling i decided to instal on BBB the lastest image of debian.

then, i updated and upgraded a system on the board.
Now there are no errors about opengl es,
so now when i start application with QTQuick 2.0 only these errors appear:
QXcbConnection: Failed to get the primary output of the screen
QXcbConnection: XCB error: 170 (Unknown), sequence: 164, resource id: 90, major code: 146 (Unknow
n), minor code: 20.

and... nothing else happens

jsulm

@Andrey-Shmelew Do you have a X server running on BBB?

Andrey Shmelew

@jsulm said in Qt Quick Renderer 2D:

X server

sorry i dont know what is this

jsulm

@Andrey-Shmelew Then you should read about it. It is the graphics environment used on UNIX/Linux machines. Do you have ANY graphics on your BBB (connected display with graphics, not text mode)?

Andrey Shmelew

@jsulm
yes, i have 10 inch display with HDMI, and applications that are not qtquick are running excellent on it,
also i can run these applicastions on my host machine throught SmartTTY XmingX

jsulm

@Andrey-Shmelew Are those applications GUI applications? How do you start them? And how do you start your application?

Andrey Shmelew

@jsulm
yes.
i take an GUI example (for example - Composition), compile it in my host machine for BBB, then i upload binary file to BBB, then i open linux on BBB and check this binary file as "make file executable" , then double click on the file and it starts,
all the same steps are for GUI with qtquick2.

while i write this post i started example clocks on my beaglebone black and it started well!

Thank you

jsulm

@Andrey-Shmelew Are you still trying to use software renderer?

root@beaglebone:/media/rootfs/media# export QMLSCENE_DEVICE=softwarecontext
root@beaglebone:/media/rootfs/media# ./noopengl

Andrey Shmelew

@jsulm

no, i am not using software renderer,
i just compile and download clocks example, but it works slowly