[Glsdk-devel] [GLM] open questions with the matrix api

[H. H. <hen...@gm...>]

There are some open questions in the mathlib's matrix api and I would like
to hear your opinions.

Do the matrices need member-wise constructors? For example, do we need
something like this:

GLMmat2f mat;
glmMatSet2f (&mat, 1.0f, 2.0f, 3.0f, 4.0f);

I suppose the user never needs to do anything like this, instead they use th
higher level entry-point such as Identity and Rotate.

However, there might be a need for constructing matrices from vectors.

GLMvec3f a, b, c;
GLMmat3f mat;
glmMatSet3f (&mat, &a, &b, &c);

At the moment, I have these entry-points and the matrices are constructed
'column-wise'. For example, the previous code creates this kind of matrix:

| a.x a.y a.z |
| b.x b.y b.z |
| c.x c.y c.z |

Should the matrices be build row-wise instead? There is an advantage in
this, as matrix rows define the coordinate axes in a 3D coordinate space.
However, OpenGL defines the matrix memory layout as column-wise, so I guess
it is a kind of more logical to build them column-wise from the vectors.

-- 
Henri 'henux' Häkkinen