Pad: Add button name -> code lookup functions

src/core/digital_controller.cpp

@@ -72,3 +72,33 @@ std::shared_ptr<DigitalController> DigitalController::Create()
 {
   return std::make_shared<DigitalController>();
 }
+
+std::optional<s32> DigitalController::GetButtonCodeByName(std::string_view button_name)
+{
+#define BUTTON(name)                                                                                                   \
+  if (button_name == #name)                                                                                            \
+  {                                                                                                                    \
+    return static_cast<s32>(ZeroExtend32(static_cast<u8>(Button::name)));                                              \
+  }
+
+  BUTTON(Select);
+  BUTTON(L3);
+  BUTTON(R3);
+  BUTTON(Start);
+  BUTTON(Up);
+  BUTTON(Right);
+  BUTTON(Down);
+  BUTTON(Left);
+  BUTTON(L2);
+  BUTTON(R2);
+  BUTTON(L1);
+  BUTTON(R1);
+  BUTTON(Triangle);
+  BUTTON(Circle);
+  BUTTON(Cross);
+  BUTTON(Square);
+
+  return std::nullopt;
+
+#undef BUTTON
+}

src/core/digital_controller.h

@@ -1,6 +1,8 @@
 #pragma once
 #include "pad_device.h"
 #include <memory>
+#include <optional>
+#include <string_view>
 
 class DigitalController final : public PadDevice
 {
@@ -29,6 +31,7 @@ public:
   ~DigitalController() override;
 
   static std::shared_ptr<DigitalController> Create();
+  static std::optional<s32> GetButtonCodeByName(std::string_view button_name);
 
   void SetButtonState(Button button, bool pressed);
 

src/core/pad_device.cpp

@@ -1,5 +1,6 @@
 #include "pad_device.h"
 #include "common/state_wrapper.h"
+#include "digital_controller.h"
 
 PadDevice::PadDevice() = default;
 
@@ -19,3 +20,19 @@ bool PadDevice::Transfer(const u8 data_in, u8* data_out)
   *data_out = 0xFF;
   return false;
 }
+
+std::shared_ptr<PadDevice> PadDevice::Create(std::string_view type_name)
+{
+  if (type_name == "DigitalController")
+    return DigitalController::Create();
+
+  return {};
+}
+
+std::optional<s32> PadDevice::GetButtonCodeByName(std::string_view type_name, std::string_view button_name)
+{
+  if (type_name == "DigitalController")
+    return DigitalController::GetButtonCodeByName(button_name);
+
+  return {};
+}

src/core/pad_device.h

@@ -1,5 +1,7 @@
 #pragma once
 #include "types.h"
+#include <optional>
+#include <string_view>
 
 class StateWrapper;
 
@@ -17,5 +19,10 @@ public:
 
   // Returns the value of ACK, as well as filling out_data.
   virtual bool Transfer(const u8 data_in, u8* data_out);
-};
 
+  /// Creates a new controller of the specified type.
+  static std::shared_ptr<PadDevice> Create(std::string_view type_name);
+
+  /// Gets the integer code for a button in the specified controller type.
+  static std::optional<s32> GetButtonCodeByName(std::string_view type_name, std::string_view button_name);
+};