WiimoteEmu: Implement MotionPlus parameter y0 and other cleanups.

Source/Core/InputCommon/ControllerEmu/ControlGroup/Cursor.cpp

@@ -6,6 +6,7 @@
 
 #include <algorithm>
 #include <cmath>
+#include <limits>
 #include <memory>
 #include <string>
 
@@ -153,8 +154,7 @@ Cursor::StateData Cursor::GetState(const bool adjusted)
   // If auto-hide time is up or hide button is held:
   if (!m_auto_hide_timer || controls[6]->control_ref->State() > BUTTON_THRESHOLD)
   {
-    // TODO: Use NaN or something:
-    result.x = 10000;
+    result.x = std::numeric_limits<ControlState>::quiet_NaN();
     result.y = 0;
   }
 
@@ -176,4 +176,9 @@ ControlState Cursor::GetVerticalOffset() const
   return m_vertical_offset_setting.GetValue() / 100;
 }
 
+bool Cursor::StateData::IsVisible() const
+{
+  return !std::isnan(x);
+}
+
 }  // namespace ControllerEmu

Source/Core/InputCommon/ControllerEmu/ControlGroup/Cursor.h

@@ -20,6 +20,8 @@ public:
     ControlState x{};
     ControlState y{};
     ControlState z{};
+
+    bool IsVisible() const;
   };
 
   explicit Cursor(const std::string& name);