Multiprocess rendering in wayland - webkitgtk+

[Ander Conselvan de Oliveira]

On 07/16/2013 07:48 AM, Kristian Høgsberg wrote:
> There's a few important things to notice in the nested example:

[...]

>   - There is some kind of issue in there that looks like nested only
>     runs at half the frame rate.  I suspect we're waiting for the frame
>     events or sending them out too late or something - it's not that
>     the nested compositor model is inherently slow.

I think the problem (or at least part of it) is a missing call to 
display_acquire_window_surface() before glEGLImageTargetTexture2DOES(). 
Some of cairo-gl functions will call eglMakeCurrent() with 
EGL_NO_CONTEXT before returning, so it is just by chance that sometimes 
we have the right context bound when bind the eglImage to the texture.

However, once I add the display_acquire_window_surface() call, some 
flicker starts to happen. It seems that when toytoolkit defers rendering 
because there is a frame callback it ends up calling eglSwapBuffers() 
anyway.

Patches coming soon.

Cheers,
Ander