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List:       kwin
Subject:    Re: float -> double
From:       Lubos Lunak <l.lunak () suse ! cz>
Date:       2007-07-19 10:16:58
Message-ID: 200707191216.58979.l.lunak () suse ! cz
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On Tuesday 17 of July 2007, Rivo Laks wrote:
> Ühel kenal päeval (teisipäev 17 juuli 2007) kirjutas Lubos Lunak:
> >  Hello,
> >
> >  I'd like to change all floats in the code to doubles. Floating point
> > constants are double by default in C/C++ and I've run into ugly rounding
> > errors because of mixing doubles and floats. Additionally, considering
> > things like http://compilers.iecc.com/comparch/article/94-11-172, I think
> > there's really not much reason to use floats - anybody disagrees?
>
> OpenGL uses floats internally, so I'm not sure if it's a good idea.
> At least leave all OpenGL stuff (e.g. vertex coordinates, texcoords, etc)
> to be floats.

 I don't think we need the added precision, but we shouldn't mix the two. 
Since constants are doubles, every computation with a constant is a double 
operation as well. Compiz seems to use floats, but also to strictly use float 
constants like 1.5f, which I don't find very nice :-/ . Ok, which one would 
you prefer :) ?

-- 
Lubos Lunak
KDE developer
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