Re: [AD] Behavior of OpenGL on Mac OS X

[Evert Glebbeek <eglebbk@xxxxxxxxxx>]

On 1 mrt 2009, at 09:43, Elias Pschernig wrote:
> I'd say, just set it to whatever the user requested. I.e. if they do:
>
> al_set_new_display_format(ALLEGRO_PIXEL_FORMAT_XBGR_8888)
>
> Then if they later lock the screen bitmap, a buffer will that format
> will be returned then. In OpenGL it really is not relevant which
> internal format is really used, in fact I'm not sure we can know that
> even with GLX or WGL.

Ok. This is what I've done now.

> I have no idea about AGL vs NSOpenGL - but in all OpenGL drivers, my
> opinion is that we should *not* care about the color sizes and
> positions. The only thing I can see making sense for a user to  
> select is
> 16 vs 32 bit, as one might give better performance than the other on
> some (old?) drivers.

Ok. That's what I was thinking as well.

> Since we now have the display_settings.c file, I think it would make
> most sense if everything uses it

I'll check how easy (or difficult) it would be to do that on OS X.

> - however I think we have to change the
> way the r/g/b/a component size and shift selection works.

They're not supported by the Cocoa API anyway, so from an OS X point  
of view you can go ahead and change it anyway you like without  
affecting the OS X port in any way. ;)

Evert