topic Re: i.Mx6q dual display gles and egl in i.MX Processors

i.Mx6q dual display gles and egl

jiejia — Wed, 24 Jun 2015 02:59:25 GMT

I can output QT app to LVDS and HDMI. Now, I want to run dual-display gles1.1+egl (LVDS + HDMI) on an i.MX6q SabreSD. I used the GLES1.1 example from vgu.tar, and the graphics is output to /dev/fb0(HDMI). But i can't make the graphics output to /dev/fb2(LVDS).

I try to do as follow,but no graphics is displayed on /dev/fb2. The graphics still output to /dev/fb0:

EGLNativeDisplayType native_display = fbGetDisplayByIndex(fbnum); // fbnum is an integer for /dev/fb2 fbnum = 2.

So how can we bind egl surface to a particular framebuffer?

Re: i.Mx6q dual display gles and egl

jayaramks — Wed, 24 Jun 2015 03:34:59 GMT

Hi,

Try QT_QPA_EGLFS_FB environment variable.

i.mx6 dual display | Embedded Software Architecture Blog

Regards,

Jayaram

Re: i.Mx6q dual display gles and egl

Bio_TICFSL — Wed, 24 Jun 2015 16:06:30 GMT

Thanks for sharing the link jayaramks.

Re: i.Mx6q dual display gles and egl

jiejia — Thu, 25 Jun 2015 06:30:10 GMT

Thanks for replying. I try the QT_QPA_EGLFS_FB(export QT_QPA_EGLFS_FB="/dev/fb2"), but the The graphics still output to /dev/fb0. My QT version is 4.8. Would it affect?

Re: i.Mx6q dual display gles and egl

jayaramks — Thu, 25 Jun 2015 08:37:25 GMT

Hi,

FYI

eglfs: Allow using a different framebuffer device (87d2fa5f) | Commits | pteam / Korvins Qtbase | GitLab

Regards,

Jayaram

Re: i.Mx6q dual display gles and egl

rans — Thu, 18 Aug 2016 16:29:27 GMT

hello

I have the same issue.

I even tried to static link /dev/fb0 to /dev/fb2

with psplash I see the image on fb2

but with qt it keeps going to fb0

Whould I search the framebuffer memory to understand what's happening ?

Thanks

Ran