AW: Screen triangle tearing

Michael.Schuldt at Michael.Schuldt at
Thu Apr 14 01:08:09 EDT 2016

Hi Arun,

we are facing the same issue some years ago. The root cause for this
at our side was the fact that in the same time where
the LayerManager is reading the content from the X11Pixmap another
application renders / clears the buffer or is rendering into that. Due
to the fact that there is no synchronization / double bufferin
by default by accessing the pixmap, you will get into this issue.

The solution was solved directly by introducing sync points in OpenGL ES
Driver during texture access.

I think you have discuss that with your silicon vendor which is providing
your graphic driver.



Von: genivi-ivi-layer-management-bounces at [mailto:genivi-ivi-layer-management-bounces at] Im Auftrag von arunkrish20 .
Gesendet: Mittwoch, 13. April 2016 08:48
An: genivi-ivi-layer-management at
Betreff: Screen triangle tearing

Hi all,
We are facing some (Screen Triangle tearing)issue while we update the 2 surfaces in parallel.
Using plugins GLES,X11 and we have 2 surfaces in a layer(i.e 2 X11 windows) will be present in display.
Most of the time triangle tearing is happening where we have a pixel update area.

Is it like surface update completed, based on that x damage event layermanager started to blend mean time other surface update in half way?
We tried to take the snapshot through dump command when that time issue is not there.

In the attached image, as i said we have 2 surfaces top surface 75% of the surface is transparent to see the bottom of the surface informations. In the bottom of the surface we are seeing this triangle tearing.
And this issue cleared when any one of the window surface is updated.

If anyone faced this kind of problem or any idea about this issue, please share you thoughts.
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