Update to v093 release.

byuu says:

Changelog:
- added Cocoa target: higan can now be compiled for OS X Lion
  [Cydrak, byuu]
- SNES/accuracy profile hires color blending improvements - fixes
  Marvelous text [AWJ]
- fixed a slight bug in SNES/SA-1 VBR support caused by a typo
- added support for multi-pass shaders that can load external textures
  (requires OpenGL 3.2+)
- added game library path (used by ananke->Import Game) to
  Settings->Advanced
- system profiles, shaders and cheats database can be stored in "all
  users" shared folders now (eg /usr/share on Linux)
- all configuration files are in BML format now, instead of XML (much
  easier to read and edit this way)
- main window supports drag-and-drop of game folders (but not game files
  / ZIP archives)
- audio buffer clears when entering a modal loop on Windows (prevents
  audio repetition with DirectSound driver)
- a substantial amount of code clean-up (probably the biggest
  refactoring to date)

One highly desired target for this release was to default to the optimal
drivers instead of the safest drivers, but because AMD drivers don't
seem to like my OpenGL 3.2 driver, I've decided to postpone that. AMD
has too big a market share. Hopefully with v093 officially released, we
can get some public input on what AMD doesn't like.

ruby/audio/ao.cpp

@@ -0,0 +1,94 @@
+/*
+  audio.ao (2008-06-01)
+  authors: Nach, RedDwarf
+*/
+
+#include <ao/ao.h>
+
+namespace ruby {
+
+class pAudioAO {
+public:
+  int driver_id;
+  ao_sample_format driver_format;
+  ao_device* audio_device;
+
+  struct {
+    unsigned frequency;
+  } settings;
+
+  bool cap(const string& name) {
+    if(name == Audio::Frequency) return true;
+    return false;
+  }
+
+  any get(const string& name) {
+    if(name == Audio::Frequency) return settings.frequency;
+    return false;
+  }
+
+  bool set(const string& name, const any& value) {
+    if(name == Audio::Frequency) {
+      settings.frequency = any_cast<unsigned>(value);
+      if(audio_device) init();
+      return true;
+    }
+
+    return false;
+  }
+
+  void sample(uint16_t l_sample, uint16_t r_sample) {
+    uint32_t samp = (l_sample << 0) + (r_sample << 16);
+    ao_play(audio_device, (char*)&samp, 4); //This may need to be byte swapped for Big Endian
+  }
+
+  void clear() {
+  }
+
+  bool init() {
+    term();
+
+    driver_id = ao_default_driver_id(); //ao_driver_id((const char*)driver)
+    if(driver_id < 0) return false;
+
+    driver_format.bits = 16;
+    driver_format.channels = 2;
+    driver_format.rate = settings.frequency;
+    driver_format.byte_format = AO_FMT_LITTLE;
+
+    ao_option* options = nullptr;
+    ao_info *di = ao_driver_info(driver_id);
+    if(!di) return false;
+    if(!strcmp(di->short_name, "alsa")) {
+      ao_append_option(&options, "buffer_time", "100000"); //100ms latency (default was 500ms)
+    }
+
+    audio_device = ao_open_live(driver_id, &driver_format, options);
+    if(!audio_device) return false;
+
+    return true;
+  }
+
+  void term() {
+    if(audio_device) {
+      ao_close(audio_device);
+      audio_device = 0;
+    }
+  }
+
+  pAudioAO() {
+    audio_device = 0;
+    ao_initialize();
+
+    settings.frequency = 22050;
+  }
+
+  ~pAudioAO() {
+    term();
+  //ao_shutdown(); //FIXME: this is causing a segfault for some reason when called ...
+  }
+};
+
+DeclareAudio(AO)
+
+};