Re: [AD] multiple windows

[Milan Mimica <milan.mimica@xxxxxxxxxx>]

Peter Hull wrote:
> Info on sharing for Macs
> http://developer.apple.com/qa/qa2001/qa1248.html
>
> Info on what SDL does
> http://www.libsdl.org/cgi/docwiki.cgi/SDL_5fDisplayFormat
> basically you load an image as its 'native' format, then use
> SDL_Surface *SDL_DisplayFormat(SDL_Surface *surface);
> to convert (optimize) it to the display's format.

I see, but as far I've been following, Allegro will automagically adapt 
bitmaps depending on how they are used. Transferring back and forth from 
video-memory bitmap happens implicitly. Programmer can only give allegro 
a hint. Allegro will manage bitmaps the best it can in respect to the 
attached AL_DISPLAY object. Did I misunderstood something so far?

I don't think it will be any harder to attach several AL_DISPLAY objects 
to the bitmap and adapt the bitmap in respect to all of them. If we've 
got two AL_DISPLAY objects opened on different X11 displays, one 
supporting OGL, the other one not, the bitmap would have to be a memory 
bitmap trying to match the pixel format of both of them if possible.
In case every AL_DISPLAY object represents a shareable OGL context the 
bitmap could be a GL texture, unless allegro decides it would be better 
if it was a memory bitmap for some other reason.

Is see no need for "compatible" bitmaps. Isn't "compatible bitmap" equal 
to "memory bitmap"?


--
Milan Mimica
http://sparklet.sf.net