Function vec4_transformMat2

docs/app/js/sanddance-app.js:70158–70166

(out, a, m)

    return out;
}
function vec4_transformMat2(out, a, m) {
    const x = a[0];
    const y = a[1];
    out[0] = m[0] * x + m[2] * y;
    out[1] = m[1] * x + m[3] * y;
    out[2] = a[2];
    out[3] = a[3];
    return out;
}
function vec4_transformMat3(out, a, m) {
    const x = a[0];
    const y = a[1];