I am a bit confused about matrices and matrix multiplication in GLSL. It is not clear to me where the entries go.
Let’s say I have a vec2 v = vec2(1.0f, 2.0f);
and a matrix mat2 m = mat2(1.0f, 2.0f, 0.0f, 1.0f);
I can multiply those two together v = m * v;
I think GLSL interprets vectors as column vectors, which means that the matrices are filled column after column. So the multiplication above is actually [ATTACH=CONFIG]1494[/ATTACH]. Also, this means that a mat2x3
is actually would appear as a 3x2 matrix
in linear algebra, and can be multiplied from the left by a vec2
.
Edit: Moreover, we can multiply matnxm
times matkxn
, in that order.
Is this the right interpretation?