> A followup question:  is there any concise way to figure out what methods in,
> say, a GL3 are always available and which methods require an extension?  The
> reason I didn't test for the shader_fp64 extension was that I didn't realize
> glUniformMatrix4dv() required that extension.  I suppose it makes sense in
> this case, but since the program compiled with a reference to that method I
> overlooked the possibility that an extension was required to use it.  How
> would I have known that (in general) without being intimately familiar with
> all the approved extensions and with what GL3 methods require them?  (Maybe
> the answer is that I need to have that familiarity, but on the other hand not
> everyone has the same level of expert familiarity with the entire spec; I'm
> wondering if there is some obvious way to know that "you can't use method X,
> even if it compiles, unless you have extension Y"...  like, perhaps, an
> interface type which is a subset of GL3 that only uses methods that don't
> require extension? Is there such a thing and I just don't know about it?)
>
> Thanks.
>