OpenGL RPi2 Arch Qt5 blank screen hangs no display
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update when launching a QML app from platform mode
example:# ./app -platform linuxfb
what other options should I use ? for example dose "Graphical Effects" need to know anything? like driver?So in qtcreator there is several examples
The "gallery" (QT Quick Extras - Gallery) one uses sliders menu and is great demo! ( it uses OpenGL it looks like )On the Rpi2 with Archlinux, the "gallery" app will run in Xfce4 but its painfully slow, like sad slow as if Open GL is getting emulated like 10+ years ago when you'd play q3atest.
and trying to run without X11 xorg, from console " ./app -platform linuxfb " it looks to launch but nothing pops up on the screen and the system seems to hang. (it doesn't hang because i can ssh reboot and things comeback)
i'm thinking there is a conflict with the mesa-lib (that gets installed with qt5-base) AND the secret sauce broadcom GPU stuff. I can't remove mesa without removing qt5 :-/
I was told this is all supposed to be ironed out Qt + RPi , also why i think its a library Arch Linux install issue maybe?note a generic hello world design thing qt app runs both ways. (but i'm guessing isn't open gl
Thanks :-)
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Hi sirmonkey,
Where did you get the debian jessie image?
I ask because when using a raspbian image all hw use is optimized and opengl 2 is used if i recall correctly. I doubt your images has been tuned for the pi hw.
Eddy
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Update:
after some reading. it looks like the ArchLinuxARM package of Qt5 is compiled with OpenGL3
the RaspberryPi2 is OpenGL2. so in X it gets emulated in Mesa.but there is probably other issues aswell maybe? I don't know
Is it possible to tell Qt on the command line which to use, or do I have to recompile Qt5 on the pi?
