[osg-users] Please test SVN version of OpenSceneGraph

sicong he hesicong2005 at gmail.com
Tue Sep 11 08:26:15 PDT 2007


My VS2005 report me:

Compiler Error C2668. 'log' : ambiguous call to overloaded function.

I see in VS2005, function log have only works with double or float:
double  __cdecl log(__in double _X);
So you should convert "int" to "double":
inline int log2(int v) { return static_cast<float>(floorf(log((double)v) *
INVLN_2)); }
But same problem happened to "floor" function. In VS2005 floor function
works with double or float, so log2 should return a float or double:
inline float log2(int v) { return static_cast<float>(floorf(log((double)v) *
INVLN_2)); }

And this new log2 function fix the build problem.




2007/9/11, Art Tevs <stud_info2 at yahoo.de>:

> yes, it seems that math.h does not define the log2
> function on some systems.
>
> Sorry, for this.
>
> My proposition is to patch the osg's Math file to
> support for log2 method. I attached the patched file,
> which contains log2 function.
>
> Best regards, Art
>
>
>
> --- sicong he <hesicong2005 at gmail.com> schrieb:
>
> > It seems that VS2005 c++ library do not have log2()
> > function defined. So I
> > change log2() function to log()/log(2.0), I don't
> > know if it is slower than
> > log2() but it really works.
> >
> > 2007/9/11, sicong he <hesicong2005 at gmail.com>:
> > >
> > > I fixed this by change all log2(x) to:
> > > log((double)maximum(...))/log(2.0)
> > > Then I successfully built under VS2005.
> > > Attachment is my patch for this problem. Please
> > test it.
> > >
> > > 2007/9/11, Shue, John <John.Shue at mantech-ist.com>:
> > > >
> > > >  I'm getting same compiler error on FreeBSD:
> > > > Texture1D.cpp:417: error: `log2' was not
> > declared in this scope
> > > >
> > > > I did:
> > > > # svn update
> > > > # ./configure
> > > > # make
> > > >
> > > > -john
> > > >
> > > >  ------------------------------
> > > > *From:*
> > osg-users-bounces at lists.openscenegraph.org [mailto:
> > > > osg-users-bounces at lists.openscenegraph.org] *On
> > Behalf Of *sicong he
> > > > *Sent:* Tuesday, September 11, 2007 10:21 AM
> > > > *To:* Public OpenSceneGraph Users discussion
> > list.
> > > > *Subject:* Re: [osg-users] Please test SVN
> > version of OpenSceneGraph
> > > >
> > > >
> > > >  I get latest version and build under VS2005.
> > > > But in these line:
> > > > TextureRectangle.cpp Line 561,
> > TextureCubeMap.cpp Line 387,
> > > > Texture3D.cpp Line 459, Texture2DArray.cpp Line
> > 467, Texture2D.cpp Line
> > > > 411,
> > > > Texture1D.cpp Line 417
> > > > These lines VS2005 reports:
> > > > error C3861: "log2" can't find symbol
> > > > Is there some header lost?
> > > >
> > > >
> > > >
> > > > 2007/9/11, Robert Osfield
> > <robert.osfield at gmail.com>:
> > > > >
> > > > > Hi All,
> > > > >
> > > > > I have merged quite a few changes to the OSG
> > over the last few days,
> > > > > these could break the build, so I'd like some
> > feedback on how the OSG
> > > > > is build and running on various platforms
> > before I go ahead the weekly
> > > > > dev release (2.1.10).
> > > > >
> > > > > Thanks in advance,
> > > > > Robert.
> > > > >
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