[openttd-devel] SDL_mixer sound and music support

[Dmitry R. <ru...@in...>]

I tried and made support for SDL_mixer sound and music output in UNIX
environment (probably it works elsewhere, I just didn't test it).  It is
a convenient option, because if you have SDL installed, you're likely to
have SDL_mixer too, and it doesn't require any external MIDI players or
the capability of mixing audio streams from several processes in a single
device.

The patch introduces a couple of new drivers which are activated by
defining WITH_SDLMIXER, then using '-m sdlmixer' argument.

It turned out that the TTD mixer API and SDL_mixer don't fit together well,
so I had to mangle mixer.c a bit.

Happy hacking,
-- 
	--- Dmitry Rutsky