Re: [AD] Expose events in OS X

[Elias Pschernig <elias.pschernig@xxxxxxxxxx>]

Peter Wang wrote:
> Then it's acting exactly as intended.  Expose events are only required on
> non-retained mode window systems.  There, if part of your window was
> previously obscured by another window and is now "exposed" (visible)
> you need to redraw at least that part of the window otherwise you'll
> see junk in that part of the screen.

I changed this in the X11 port so you now see black instead of junk. I don't 
think this will have any negative consequences, but looks somewhat less broken.

> > This probably needs to be made clear in the documentation, or
> > al_create_display() should fail if expose events are required.
>
> It shouldn't fail.  Just ignore the flag.

I also made another little discovery - GLX actually always keeps the contents of 
each OpenGL window (if double buffering is used) and only X11 itself forgets 
them. Therefore calling glXSwapBuffers() on a window repairs any damage from 
being obscured by other windows.

Maybe should mention this in the docs somewhere and also simplify the examples 
accordingly? Basically there is no need to redraw anything manually, just 
calling al_flip_display() is enough.

--
Elias Pschernig <elias@xxxxxxxxxx>