[Openal] Defective ALC_ENUMERATION_EXT support on Mac OS X / Need OpenAL community's support

[Chris Robinson]

FWIW, I fully agree with your assessment about the need for proper enumeration 
on systems that have multiple input/output devices. It kinda defeats the 
purpose of enumeration if all you can do is select the default choice.

Unfortunately though, I'm not a Mac developer, so there's nothing I can 
directly do about it (at least until OpenAL Soft properly supports OSX).. 
just voice my support for proper enumeration.

There are a couple points I want to respond to in your email, though..

> I also double-null-terminate
> individual/specific device queries since that is what the current
> implementation does even though the 1.1 spec says nothing about this.

The double-null termination is called for by the spec, actually. It's how the 
list is terminated.

9.5. ALC_ENUMERATION_EXT on page 62 of the spec:
"Each device name will be separated by a single NULL character and the list 
will be terminated with two NULL characters."

So you want to have a single NULL char after each device string, then place an 
extra NULL char after the last string. Since a single NULL character is used 
as a delimiter, another one must be appended (giving an "empty name") so that 
the app knows to stop looking through the string.

> (By the way, this might also suggest a need for another OpenAL
> extension. This suggests there is a distinction between a unique
> identifier and a human-readable localized device description.)

AFAIK, the device desciption is intended to be the identifier. The 
implementation is allowed to append things to device names to make sure it is 
unique (so long as it accepts the modified string, of course).