ControllerEmu: Add default mappings for Android

Unlike PCs, Android doesn't really have any input method (not counting
touch) that can reasonably be expected to exist on most devices.
Because of this, I don't think shipping with a default mapping for the
buttons and sticks of GameCube controllers and Wii Remotes makes sense.
I would however like to ship default mappings for a few things:

1. Mapping the Wii Remote's accelerometer and gyroscope to the device's
   accelerometer and gyroscope. This functionality is useful mainly
   for people who use the touchscreen, but can also be useful when
   using a clip-on controller. The disadvantage of having this mapped
   by default is that games disable pointer input if the accelerometer
   reports that the Wii Remote is pointed at the ceiling.

2. Mapping GC keyboards for use with a physical keyboard, like on PC.
   After all, there's no other way of mapping them that makes sense.

3. Mapping rumble to the device's vibrator.

Aside from the GC keyboards, this approach is effectively the same as
what we were doing before the input overhaul.

Source/Core/Core/FreeLookManager.cpp

@@ -120,6 +120,7 @@ void FreeLookController::LoadDefaults(const ControllerInterface& ciface)
 {
   EmulatedController::LoadDefaults(ciface);
 
+#ifndef ANDROID
   auto hotkey_string = [](std::vector<std::string> inputs) {
     return "@(" + JoinStrings(inputs, "+") + ')';
   };
@@ -194,6 +195,7 @@ void FreeLookController::LoadDefaults(const ControllerInterface& ciface)
   m_rotation_gyro->SetControlExpression(GyroButtons::YawRight,
                                         "if(`Click 1`,`RelativeMouse X+` * 0.10, 0)");
 #endif
+#endif
 }
 
 ControllerEmu::ControlGroup* FreeLookController::GetGroup(FreeLookGroup group) const

Source/Core/Core/HW/GBAPadEmu.cpp

@@ -83,6 +83,7 @@ void GBAPad::LoadDefaults(const ControllerInterface& ciface)
 {
   EmulatedController::LoadDefaults(ciface);
 
+#ifndef ANDROID
   // Buttons
   m_buttons->SetControlExpression(0, "`Z`");  // B
   m_buttons->SetControlExpression(1, "`X`");  // A
@@ -101,4 +102,5 @@ void GBAPad::LoadDefaults(const ControllerInterface& ciface)
   m_dpad->SetControlExpression(1, "`G`");  // Down
   m_dpad->SetControlExpression(2, "`F`");  // Left
   m_dpad->SetControlExpression(3, "`H`");  // Right
+#endif
 }

Source/Core/Core/HW/GCKeyboardEmu.cpp

@@ -257,6 +257,47 @@ void GCKeyboard::LoadDefaults(const ControllerInterface& ciface)
   m_keys5x->SetControlExpression(2, "`Up Arrow`");
   m_keys5x->SetControlExpression(3, "`Right Arrow`");
   m_keys5x->SetControlExpression(4, "Return");
+#elif ANDROID
+  m_keys0x->SetControlExpression(0, "`Move Home`");
+  m_keys0x->SetControlExpression(1, "`Move End`");
+  m_keys0x->SetControlExpression(2, "`Page Up`");
+  m_keys0x->SetControlExpression(3, "`Page Down`");
+  m_keys0x->SetControlExpression(4, "`Scroll Lock`");
+
+  m_keys2x->SetControlExpression(9, "`Minus`");
+  m_keys2x->SetControlExpression(10, "`Grave`");
+  m_keys2x->SetControlExpression(11, "`PrtSc SysRq`");
+  m_keys2x->SetControlExpression(12, "`Apostrophe`");
+  m_keys2x->SetControlExpression(13, "`Left Bracket`");
+  m_keys2x->SetControlExpression(14, "``Equals``");
+  m_keys2x->SetControlExpression(15, "`Numpad Multiply`");
+  m_keys3x->SetControlExpression(0, "`Right Bracket`");
+  m_keys3x->SetControlExpression(1, "`Comma`");
+  m_keys3x->SetControlExpression(2, "`Period`");
+  m_keys3x->SetControlExpression(3, "`Slash`");
+  m_keys3x->SetControlExpression(4, "`Backslash`");
+
+  m_keys4x->SetControlExpression(1, "`Escape`");
+  m_keys4x->SetControlExpression(2, "`Insert`");
+  m_keys4x->SetControlExpression(3, "`Delete`");
+  m_keys4x->SetControlExpression(4, "`Semicolon`");
+  m_keys4x->SetControlExpression(5, "`Backspace`");
+  m_keys4x->SetControlExpression(6, "`Tab`");
+  m_keys4x->SetControlExpression(7, "`Caps Lock`");
+  m_keys4x->SetControlExpression(8, "`Left Shift`");
+  m_keys4x->SetControlExpression(9, "`Right Shift`");
+  m_keys4x->SetControlExpression(10, "`Left Ctrl`");
+  m_keys4x->SetControlExpression(11, "`Right Alt`");
+  m_keys4x->SetControlExpression(12, "`Left Meta`");
+  m_keys4x->SetControlExpression(13, "`Space`");
+  m_keys4x->SetControlExpression(14, "`Right Meta`");
+  m_keys4x->SetControlExpression(15, "`Menu`");
+
+  m_keys5x->SetControlExpression(0, "`Left`");
+  m_keys5x->SetControlExpression(1, "`Down`");
+  m_keys5x->SetControlExpression(2, "`Up`");
+  m_keys5x->SetControlExpression(3, "`Right`");
+  m_keys5x->SetControlExpression(4, "`Enter`");
 #else  // linux
   m_keys0x->SetControlExpression(0, "Home");
   m_keys0x->SetControlExpression(1, "End");

Source/Core/Core/HW/GCPadEmu.cpp

@@ -170,12 +170,16 @@ void GCPad::LoadDefaults(const ControllerInterface& ciface)
 {
   EmulatedController::LoadDefaults(ciface);
 
+#ifdef ANDROID
+  // Rumble
+  m_rumble->SetControlExpression(0, "`Android/0/Device Sensors:Motor 0`");
+#else
   // Buttons
-  m_buttons->SetControlExpression(0, "`X`");  // A
+  m_buttons->SetControlExpression(0, "`X`");       // A
-  m_buttons->SetControlExpression(1, "`Z`");  // B
+  m_buttons->SetControlExpression(1, "`Z`");       // B
-  m_buttons->SetControlExpression(2, "`C`");  // X
+  m_buttons->SetControlExpression(2, "`C`");       // X
-  m_buttons->SetControlExpression(3, "`S`");  // Y
+  m_buttons->SetControlExpression(3, "`S`");       // Y
-  m_buttons->SetControlExpression(4, "`D`");  // Z
+  m_buttons->SetControlExpression(4, "`D`");       // Z
 #ifdef _WIN32
   m_buttons->SetControlExpression(5, "`RETURN`");  // Start
 #else
@@ -225,6 +229,7 @@ void GCPad::LoadDefaults(const ControllerInterface& ciface)
   // Triggers
   m_triggers->SetControlExpression(0, "`Q`");  // L
   m_triggers->SetControlExpression(1, "`W`");  // R
+#endif
 }
 
 bool GCPad::GetMicButton() const

Source/Core/Core/HW/WiimoteEmu/Extension/Nunchuk.cpp

@@ -198,6 +198,7 @@ void Nunchuk::DoState(PointerWrap& p)
 
 void Nunchuk::LoadDefaults(const ControllerInterface& ciface)
 {
+#ifndef ANDROID
   // Stick
   m_stick->SetControlExpression(0, "W");  // up
   m_stick->SetControlExpression(1, "S");  // down
@@ -228,5 +229,6 @@ void Nunchuk::LoadDefaults(const ControllerInterface& ciface)
     m_shake->SetControlExpression(i, "`Click 2`");
 #endif
   }
+#endif
 }
 }  // namespace WiimoteEmu

Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp

@@ -655,6 +655,24 @@ void Wiimote::LoadDefaults(const ControllerInterface& ciface)
 {
   EmulatedController::LoadDefaults(ciface);
 
+#ifdef ANDROID
+  // Rumble
+  m_rumble->SetControlExpression(0, "`Android/0/Device Sensors:Motor 0`");
+
+  // Motion Source
+  m_imu_accelerometer->SetControlExpression(0, "`Android/0/Device Sensors:Accel Up`");
+  m_imu_accelerometer->SetControlExpression(1, "`Android/0/Device Sensors:Accel Down`");
+  m_imu_accelerometer->SetControlExpression(2, "`Android/0/Device Sensors:Accel Left`");
+  m_imu_accelerometer->SetControlExpression(3, "`Android/0/Device Sensors:Accel Right`");
+  m_imu_accelerometer->SetControlExpression(4, "`Android/0/Device Sensors:Accel Forward`");
+  m_imu_accelerometer->SetControlExpression(5, "`Android/0/Device Sensors:Accel Backward`");
+  m_imu_gyroscope->SetControlExpression(0, "`Android/0/Device Sensors:Gyro Pitch Up`");
+  m_imu_gyroscope->SetControlExpression(1, "`Android/0/Device Sensors:Gyro Pitch Down`");
+  m_imu_gyroscope->SetControlExpression(2, "`Android/0/Device Sensors:Gyro Roll Left`");
+  m_imu_gyroscope->SetControlExpression(3, "`Android/0/Device Sensors:Gyro Roll Right`");
+  m_imu_gyroscope->SetControlExpression(4, "`Android/0/Device Sensors:Gyro Yaw Left`");
+  m_imu_gyroscope->SetControlExpression(5, "`Android/0/Device Sensors:Gyro Yaw Right`");
+#else
 // Buttons
 #if defined HAVE_X11 && HAVE_X11
   // A
@@ -672,10 +690,10 @@ void Wiimote::LoadDefaults(const ControllerInterface& ciface)
   // B
   m_buttons->SetControlExpression(1, "`Click 1`");
 #endif
-  m_buttons->SetControlExpression(2, "`1`");  // 1
+  m_buttons->SetControlExpression(2, "`1`");     // 1
-  m_buttons->SetControlExpression(3, "`2`");  // 2
+  m_buttons->SetControlExpression(3, "`2`");     // 2
-  m_buttons->SetControlExpression(4, "Q");    // -
+  m_buttons->SetControlExpression(4, "Q");       // -
-  m_buttons->SetControlExpression(5, "E");    // +
+  m_buttons->SetControlExpression(5, "E");       // +
 
 #ifdef _WIN32
   m_buttons->SetControlExpression(6, "RETURN");  // Home
@@ -729,6 +747,7 @@ void Wiimote::LoadDefaults(const ControllerInterface& ciface)
   m_imu_gyroscope->SetControlExpression(3, "`Gyro Roll Right`");
   m_imu_gyroscope->SetControlExpression(4, "`Gyro Yaw Left`");
   m_imu_gyroscope->SetControlExpression(5, "`Gyro Yaw Right`");
+#endif
 
   // Enable Nunchuk:
   constexpr ExtensionNumber DEFAULT_EXT = ExtensionNumber::NUNCHUK;