Done. See https://bugzilla.yoctoproject.org/show_bug.cgi?id=6760
On 2014-09-24 17:36, Daiane Angolini wrote:
On Tue, Sep 23, 2014 at 5:09 PM, Carlos Rafael Giani
<[email protected]> wrote:
While this is correct for output that is drawn directly to the framebuffer
(with damage regions etc.), it isn't for compositor-based output, such as
what Weston does. There, it is not uncommon to repaint the entire screen.
If it uses GLES as the backend, this is the only way to do it, unless some
extension for swapping buffer subregions exists. Perhaps by using a
compositor in X buffer flipping would be viable.
Carlos, would you mind to open a bug on bugzilla for this VSYNC issue?
It looks like you can describe it better than me. Please add the html
file you shared and the DISTRO_FEATURES needed to reproduce the issue.
Also, please, say which kernel version you used and which GPU version.
I can then, update this with the comments from Prabhu, and change its
status accordingly.
Thanks in advance,
Daiane
On 2014-09-23 20:46, Eric Nelson wrote:
Hi Carlos,
On 09/23/2014 10:52 AM, Carlos Rafael Giani wrote:
I wonder why it is single buffered. is it because of the memory
consumption for a second buffer? The buffers could be flipped,
eliminating any need for blits, so the memory bandwidth should not be an
issue.
There is a memory bandwidth implication.
Assuming frame buffers A and B in a double-buffered system,
rendering will occur into B while A is displayed, then the
two will be swapped, such that B is displayed and A is the
new rendering output.
In order for apps to only update parts of their windows, any
"dirty" blocks need to be copied from B to A in the process
of the flip.
On 2014-09-23 18:48, Prabhu S wrote:
i.MX6 X11 EGL is single buffered and there is no support for VSYNC.
The tearing with X11 is a known issue. We did investigate to fix this,
but the solution becomes too hacky and cannot be used in production
systems.
We are adding VSYNC support in Wayland. eglSwapInterval will be
supported for FBDEV and Wayland backends in the upcoming release(in
january). So Ozone-wayland can take advantage of this.
?? This is already supported in Wayland, though it is controlled
by an environment variable.
You can see it in action by watching /sys/class/graphics/fb0/pan.
Regards,
Eric
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