why wi_surface_frame callback delay two frames

[Nancy Zou]

Hi Pekka

>>how do you differ from the main loops and event handlers in Weston's simple-shm.c or simple-egl.c?
>>Are you using EGL? Which implementation of EGL?

I try to do a implementation for the wayland-egl flip driver because my linux sgx driver don't support wayland now. When I do it, I refer the simple-shm.c. My test case is simple-egl.c.

I want to mark client buffer status like the android BufferQueue do.  When one frame call back, the buffer status will be free. But I find buffer free is always delay.

>> Is your main loop flushing and waiting properly? For the simple case, see simple-shm.c. For more complicated case, see http://wayland.freedesktop.org/docs/html/apb.html#Client-classwl__display
and wl_display_prepare_read() and wl_display_read_events().

I don't use wl_display_prepare_read() and wl_display_read_events(). I call wl_display_flush after the wl_surface_commit which will be called by eglSwapBuffers().  Should I call wl_display_flush when the client is end? The simple-egl have already called it.


>>If it is not a deadlock but just a timing issue, see:
>>http://ppaalanen.blogspot.fi/2015/02/weston-repaint-scheduling.html
Thank you. I will read the documents.

Best Regards
Nancy


Member of the CSR plc group of companies. CSR plc registered in England and Wales, registered number 4187346, registered office Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom
More information can be found at www.csr.com. Keep up to date with CSR on our technical blog, www.csr.com/blog, CSR people blog, www.csr.com/people, YouTube, www.youtube.com/user/CSRplc, Facebook, www.facebook.com/pages/CSR/191038434253534, or follow us on Twitter at www.twitter.com/CSR_plc.
You can now access the wide range of products powered by aptX at www.aptx.com