Re: [AD] Alleg5 - new driver structure idea

[Bob <ohannessian@xxxxxxxxxx>]

Angelo Mottola wrote:

> > > There is also the issue of supporting older interfaces. What if we
> > > add a parameter to blit() for example? We can make a "blit2" entry 
> > > in
> > > the driver, but then we also need to support the old "blit"
> > > interface.
> > >      
> > Or supply a default "blit2" entry, only used when the driver doesn't 
> > provide it, which wraps around the original "blit" call.
> >    
>
> Even better: the proposed AL_DRIVER_VTABLE_ENTRY structure has a 
> "version" parameter that could be useful here. Suppose we have Allegro 
> 5.0 and a gfx driver that has "blit" version 5.0. On startup, Allegro 
> would connect the driver hook with the internal AL_GFX_DRIVER_VTABLE 
> version 5.0.

That's the idea. The problem is if we ever end up with some interface 
for which emulating the old (possibly broken) behavior would be too much 
work.