Re: [AD] DRAW_MODE_TRANS in Zbuffered POLYTYPE_FLAT

[tom st denis <tomstdenis@xxxxxxxxxx>]

--- Sven Sandberg <ssven.geo@xxxxxxxxxx> wrote:
> tom st denis wrote:
> > Doesn't make sense.  If there is a pixel with a further z-coord a
> > closer one should overwrite it in a zbuffer model right?  Then why
> > can't it just translucify it as it draws over the other pixels?
> > 
> > It can be done (I have done it with Plush3d before) with only one
> > zbuffer, you just have to sort your faces first.
> 
> Ah, now I understand. You're right, it can be done if you assume the
> translucent polygons are sorted (but not otherwise). And z-buffering
> can
> be needed even if you know that these polygons are already sorted,
> since
> there may be other non-translucent polygons that are not (and can't
> be)
> sorted, right?
> 
> So I suppose the reason why Allegro doesn't support this is that
> z-buffering is a very new feature and no one has written this yet. If
> you need it, I guess you'll have to write it yourself and ask the
> people
> in charge to add it...

I would gladly add it unfortunately I am very unfamiliar with the
internals of Allegro.  I just use it :-)

Tom

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