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 > > > -- > _______________________________________________ > meta-freescale mailing list > [email protected] > https://lists.yoctoproject.org/listinfo/meta-freescale -- _______________________________________________ meta-freescale mailing list [email protected] https://lists.yoctoproject.org/listinfo/meta-freescale
