Massive refactoring of all code + audio skeleton.

This should make it easier to find files and (in the future) split things
up into separate libraries.
It also changes around emulator initialization to make it a little more
difficult to do things out of order and a little more sensible as to when
real init work happens.
Also adding a skeleton audio system/driver and reworking CPU register
access to be more extensible.

src/xenia/apu/audio_system.h

@@ -0,0 +1,82 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_APU_AUDIO_SYSTEM_H_
+#define XENIA_APU_AUDIO_SYSTEM_H_
+
+#include <xenia/core.h>
+#include <xenia/xbox.h>
+
+
+XEDECLARECLASS1(xe, Emulator);
+XEDECLARECLASS2(xe, cpu, Processor);
+
+
+namespace xe {
+namespace apu {
+
+class AudioDriver;
+
+
+class AudioSystem {
+public:
+  virtual ~AudioSystem();
+
+  Emulator* emulator() const { return emulator_; }
+  xe_memory_ref memory() const { return memory_; }
+  cpu::Processor* processor() const { return processor_; }
+
+  virtual X_STATUS Setup();
+
+  bool HandlesRegister(uint32_t addr);
+  virtual uint64_t ReadRegister(uint32_t addr);
+  virtual void WriteRegister(uint32_t addr, uint64_t value);
+
+protected:
+  virtual void Initialize();
+  virtual void Pump() = 0;
+  virtual void Shutdown();
+
+private:
+  static void ThreadStartThunk(AudioSystem* this_ptr) {
+    this_ptr->ThreadStart();
+  }
+  void ThreadStart();
+
+  static bool HandlesRegisterThunk(AudioSystem* as, uint32_t addr) {
+    return as->HandlesRegister(addr);
+  }
+  static uint64_t ReadRegisterThunk(AudioSystem* as, uint32_t addr) {
+    return as->ReadRegister(addr);
+  }
+  static void WriteRegisterThunk(AudioSystem* as, uint32_t addr,
+                                 uint64_t value) {
+    as->WriteRegister(addr, value);
+  }
+
+protected:
+  AudioSystem(Emulator* emulator);
+
+  Emulator*         emulator_;
+  xe_memory_ref     memory_;
+  cpu::Processor*   processor_;
+
+  xe_run_loop_ref   run_loop_;
+  xe_thread_ref     thread_;
+  bool              running_;
+
+  AudioDriver*      driver_;
+};
+
+
+}  // namespace apu
+}  // namespace xe
+
+
+#endif  // XENIA_APU_AUDIO_SYSTEM_H_