quat_from_mat4x4 uses wrong element layout

[gentili]

linmath.h/linmath.h

Line 546 in 3eef828

LINMATH_H_FUNC void quat_from_mat4x4(quat q, mat4x4 const M)

assignment is [w,x,y,z] instead of [x,y,z,w] like everywhere else:

if(r < 1e-6) {
		q[0] = 1.f;
		q[1] = q[2] = q[3] = 0.f;
		return;
	}

	q[0] = r/2.f;
	q[1] = (M[p[0]][p[1]] - M[p[1]][p[0]])/(2.f*r);
	q[2] = (M[p[2]][p[0]] - M[p[0]][p[2]])/(2.f*r);
	q[3] = (M[p[2]][p[1]] - M[p[1]][p[2]])/(2.f*r);

[datenwolf]

@gentili I'm a bit reluctant to fix this in this function, since this would impair existing software using this function and taking this inconsistency into account. I'm thinking of adding a consistency wrapper, or just adding a quirk notice.

[gentili]

That makes sense. I've forked and made a bunch of modifications and additions anyway. Thanks for the handy lib!