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/cpu/ppc/registers.h

@@ -0,0 +1,40 @@
+/**
+ ******************************************************************************
+ * 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_CPU_PPC_REGISTERS_H_
+#define XENIA_CPU_PPC_REGISTERS_H_
+
+#include <xenia/common.h>
+
+
+namespace xe {
+namespace cpu {
+namespace ppc {
+
+
+typedef bool (*RegisterHandlesCallback)(void* context, uint32_t addr);
+typedef uint64_t (*RegisterReadCallback)(void* context, uint32_t addr);
+typedef void (*RegisterWriteCallback)(void* context, uint32_t addr,
+                                      uint64_t value);
+
+
+typedef struct {
+  void* context;
+  RegisterHandlesCallback handles;
+  RegisterReadCallback read;
+  RegisterWriteCallback write;
+} RegisterAccessCallbacks;
+
+
+}  // namespace ppc
+}  // namespace cpu
+}  // namespace xe
+
+
+#endif  // XENIA_CPU_PPC_REGISTERS_H_

src/xenia/cpu/ppc/sources.gypi

@@ -10,6 +10,7 @@
     'instr.cc',
     'instr.h',
     'instr_tables.h',
+    'registers.h',
     'state.cc',
     'state.h',
   ],

src/xenia/cpu/ppc/state.h

@@ -13,12 +13,8 @@
 #include <stdint.h>
 
 
-namespace xe {
-namespace cpu {
-class Processor;
-class ThreadState;
-}  // namespace cpu
-}  // namespace xe
+XEDECLARECLASS2(xe, cpu, Processor);
+XEDECLARECLASS2(xe, cpu, ThreadState);
 
 
 // namespace FPRF {