ControlGroup/Triggers: Return state data by value

Makes it less error-prone to get state data from analog sticks (no need
to pass any locals), and also allows direct assignment, letting the
retrieved data be const.

Source/Core/Core/HW/WiimoteEmu/Attachment/Guitar.cpp

@@ -126,9 +126,8 @@ void Guitar::GetState(u8* const data)
   }
 
   // whammy bar
-  ControlState whammy;
-  m_whammy->GetState(&whammy);
-  guitar_data.whammy = static_cast<u8>(whammy * 0x1F);
+  const ControllerEmu::Triggers::StateData whammy_state = m_whammy->GetState();
+  guitar_data.whammy = static_cast<u8>(whammy_state.data[0] * 0x1F);
 
   // buttons
   m_buttons->GetState(&guitar_data.bt, guitar_button_bitmasks.data());

Source/Core/Core/HW/WiimoteEmu/Attachment/Turntable.cpp

@@ -118,13 +118,11 @@ void Turntable::GetState(u8* const data)
 
   // effect dial
   {
-    ControlState dial;
-    m_effect_dial->GetState(&dial);
+    const ControllerEmu::Triggers::StateData state = m_effect_dial->GetState();
+    const u8 dial = static_cast<u8>(state.data[0] * 0x0F);
 
-    const u8 dial_ = static_cast<u8>(dial * 0x0F);
-
-    tt_data.dial1 = dial_;
-    tt_data.dial2 = dial_ >> 3;
+    tt_data.dial1 = dial;
+    tt_data.dial2 = dial >> 3;
   }
 
   // crossfade slider

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

@@ -21,12 +21,15 @@ Triggers::Triggers(const std::string& name_) : ControlGroup(name_, GroupType::Tr
   numeric_settings.emplace_back(std::make_unique<NumericSetting>(_trans("Dead Zone"), 0, 0, 50));
 }
 
-void Triggers::GetState(ControlState* analog)
+Triggers::StateData Triggers::GetState()
 {
   const size_t trigger_count = controls.size();
   const ControlState deadzone = numeric_settings[0]->GetValue();
 
-  for (size_t i = 0; i < trigger_count; ++i, ++analog)
-    *analog = std::max(controls[i]->control_ref->State() - deadzone, 0.0) / (1 - deadzone);
+  StateData result(trigger_count);
+  for (size_t i = 0; i < trigger_count; ++i)
+    result.data[i] = std::max(controls[i]->control_ref->State() - deadzone, 0.0) / (1 - deadzone);
+
+  return result;
 }
 }  // namespace ControllerEmu

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

@@ -5,6 +5,8 @@
 #pragma once
 
 #include <string>
+#include <vector>
+
 #include "InputCommon/ControllerEmu/ControlGroup/ControlGroup.h"
 #include "InputCommon/ControllerInterface/Device.h"
 
@@ -13,8 +15,16 @@ namespace ControllerEmu
 class Triggers : public ControlGroup
 {
 public:
+  struct StateData
+  {
+    StateData() = default;
+    explicit StateData(std::size_t trigger_count) : data(trigger_count) {}
+
+    std::vector<ControlState> data;
+  };
+
   explicit Triggers(const std::string& name);
 
-  void GetState(ControlState* analog);
+  StateData GetState();
 };
 }  // namespace ControllerEmu