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- Subject: RE: Homogeneous numeric vector datatypes
- From: "Jerome Vuarand" <jerome.vuarand@...>
- Date: Mon, 14 Apr 2008 15:02:01 -0400
Panagiotis Vossos wrote:
> Has anybody written a srfi-4-like
> library for lua?
> Some more context:
> I have already embedded lua in one C++ project and the results were
> After trying out guile, chicken, mzscheme, gambit-c, tcl, python and
> ruby, it was refreshing to find a language that doesn't suck _and_ is
> easy to embed.
> PiL2 is such a joy to read, full of great ideas on language design,
> in some ways it reminds me the scsh manual.
> I am now trying to use the lua repl as the glue between various
> numeric / geometric libraries. While writing bindings, I came to
> realize that it would be great if there was a semi-standard way to
> manipulate homogeneous vectors from lua. Such a library should be
> accessible from both lua and C and would simplify the writing of glue
> Possible solutions I've already thought of:
> 1) Avoid homogeneous vectors, just convert before and after the C
> function to lua tables. This method works, but is not optimal when
> you're writing a binding for BLAS/LAPACK and you have *huge* vectors.
> 2) Writing such a srfi-4 like library is easy, just go ahead and
> write it. In that case, it would be nice to avoid duplication. I am
> thinking of starting such a project, should not take much time to
> wrap the 10 datatypes from srfi-4 and provide both C & lua apis.
> Would anybody be interested in such code?
> 3) A library like that already exists / there is a better way. In
> that case, can you share some pointers / ideas ?
I wrote a geometric datatype library for Lua. It includes 3D vectors, 3D homogeneous vectors, quaternions, 3D matrices and 3D homogeneous matrices, with some operations between these types (conversions, tranformation application), and import/export from/to tables or lists (à la unpack). It does only have a single underlying datatype (currently float, but it started as double, so it should be easy to use yet another type). It does have some preliminary animation/interpolation functions too.
I use it for a little 3D game engine, and various data generation/analysis tools. If you don't find anything better and want to have a look I can give you the source code.