Hi Jan,
It may be technically doable to implement the OSG Vec/Matrix API via the Eigen
library along these lines:
Code:
namespace osg {
template< typename T > class Vec3t : public Eigen::Matrix< T, 3, 1 >
{
public:
Vec3t() : Eigen::Matrix< T, 3, 1 >(0, 0, 0) {} // Eigen not zero by default
Vec3t(T x, T y, T z) : Eigen::Matrix< T, 3, 1 >(x, y, z) {}
Vec3t(const Eigen::Matrix< T, 3, 1 >& copy) : Eigen::Matrix< T, 3, 1
>(copy) {}
// ...
};
template< typename T > inline
auto operator ^ (const Vec3t< T >& t1, const Vec3t< T >& t2) ->
decltype(t1.cross(t2))
{
return t1.cross(t2);
}
template< typename T > inline
auto operator * (const Vec3t< T >& t1, const Vec3t< T >& t2) ->
decltype(t1.dot(t2))
{
return t1.dot(t2);
}
typedef Vec3t< double > Vec3d;
}
However:* #include Eigen/Core, etc slows down compilation brutaly
* Requires c++11 (however this compiles with VC2010)
* 3D vectors will not be vectorized and thus not optimized with SSE.
* Copying to/from wrapper classes slows down, but optimizing compilers may/will
eliminate that.
Cheers,
Tyge[/code]
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=63689#63689
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