Fails. Problem spotted on WebGL 2 and is an unfortunate consequence of
these events:
1. Neither EXT_DSA nor ARB_DSA is available, but VAOs are available,
which means virtually all ES 3 and WebGL 2 implementations and also
ES 2 / WebGL 1 with OES_VAO available.
2. Index buffer gets created with TargetHint::ElementArray, bound to
GL_ELEMENT_ARRAY_BUFFER and filled with data.
3. Mesh object with VAO inside is created and the index buffer from
above gets bound to GL_ELEMENT_ARRAY_BUFFER again to attach it to the
VAO.
4. Another index buffer, possibly for another mesh, gets created with
TargetHint::ElementArray and bound to GL_ELEMENT_ARRAY_BUFFER in
order to be filled with data. But because the VAO from above is still
bound, the index buffer attachment is then stomped on.
5. Rendering such mesh will use a different index buffer, most probably
causing some out-of-range GL error and nothing rendered.
Vladimír Vondruš