EGL_MESA_screen_surface version 5

[Adam Jackson]

On Thursday 07 April 2005 11:45, Jon Smirl wrote:
> On Apr 7, 2005 11:05 AM, Adam Jackson <ajax at nwnk.net> wrote:
> > HAL events are generally multicast over DBUS to any interested listening
> > application.  The driver could in principle open a new fd for this, but
> > it would be more straightforward for us if the event were also noted in
> > the sarea.
>
> Doesn't this have to be processed at the highest level?

Eventually, sure.

> We can't change the format of the framebuffer without letting the app
> drawing the desktop know.

I wasn't proposing that we do so.

> Instead the app drawing the desktop catches the 
> event,  picks a new format and sets it into EGL.

That's perfectly acceptable, if you have HAL and DBUS.

Now imagine a world without DBUS:

- kernel driver notices hardware switch
- kernel driver flips bit in shared state indicating old screen surface is
  invalid
- userspace driver is asked to draw something, fails due to previous bit
- application notices EGL_SCREEN_LOST_MESA and reconfigures

The notification percolates up the stack just fine.  This is useful to expose 
through the EGL API directly, because EGL is more than just linux-solo 
systems.

- ajax
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