* On GL you can specify a vertex attribute that's stored as int but gets
converted to float with glVertexAttribFormat instead of glVertexAttribIFormat.
However if the shader accepts an int this is invalid and the value is
undefined - we emulate this as the float bits being read as int directly, but
that's not guaranteed behaviour.
* Normally we don't emulate this kind of mis-cast behaviour and just display the
type of data passed to the shader, but in this case GL lets you specify three
types (stored as int, cast to float, read as int) so our normal behaviour of
just showing the input can be more misleading than normal.
baldurk
0804ef63be