Allow mapping half axes to buttons

This allows to bind pressure sensitive NeGcon buttons to keyboard,
mouse and controller buttons

src/frontend-common/common_host_interface.cpp

@@ -7,7 +7,6 @@
 #include "common/string_util.h"
 #include "controller_interface.h"
 #include "core/cdrom.h"
-#include "core/controller.h"
 #include "core/cpu_code_cache.h"
 #include "core/dma.h"
 #include "core/game_list.h"
@@ -1055,8 +1054,9 @@ void CommonHostInterface::UpdateControllerInputMap(SettingsInterface& si)
     const auto axis_names = Controller::GetAxisNames(ctype);
     for (const auto& it : axis_names)
     {
-      const std::string& axis_name = it.first;
-      const s32 axis_code = it.second;
+      const std::string& axis_name = std::get<std::string>(it);
+      const s32 axis_code = std::get<s32>(it);
+      const auto axis_type = std::get<Controller::AxisType>(it);
 
       const std::vector<std::string> bindings =
         si.GetStringList(category, TinyString::FromFormat("Axis%s", axis_name.c_str()));
@@ -1066,7 +1066,7 @@ void CommonHostInterface::UpdateControllerInputMap(SettingsInterface& si)
         if (!SplitBinding(binding, &device, &axis))
           continue;
 
-        AddAxisToInputMap(binding, device, axis, [this, controller_index, axis_code](float value) {
+        AddAxisToInputMap(binding, device, axis, axis_type, [this, controller_index, axis_code](float value) {
           if (System::IsShutdown())
             return;
 
@@ -1198,8 +1198,44 @@ bool CommonHostInterface::AddButtonToInputMap(const std::string& binding, const
 }
 
 bool CommonHostInterface::AddAxisToInputMap(const std::string& binding, const std::string_view& device,
-                                            const std::string_view& axis, InputAxisHandler handler)
+                                            const std::string_view& axis, Controller::AxisType axis_type,
+                                            InputAxisHandler handler)
 {
+  if (axis_type == Controller::AxisType::Half)
+  {
+    if (device == "Keyboard")
+    {
+      std::optional<int> key_id = GetHostKeyCode(axis);
+      if (!key_id.has_value())
+      {
+        Log_WarningPrintf("Unknown keyboard key in binding '%s'", binding.c_str());
+        return false;
+      }
+
+      m_keyboard_input_handlers.emplace(key_id.value(), std::move(handler));
+      return true;
+    }
+
+    if (device == "Mouse")
+    {
+      if (StringUtil::StartsWith(axis, "Button"))
+      {
+        const std::optional<s32> button_index = StringUtil::FromChars<s32>(axis.substr(6));
+        if (!button_index.has_value())
+        {
+          Log_WarningPrintf("Invalid button in mouse binding '%s'", binding.c_str());
+          return false;
+        }
+
+        m_mouse_input_handlers.emplace(static_cast<HostMouseButton>(button_index.value()), std::move(handler));
+        return true;
+      }
+
+      Log_WarningPrintf("Malformed mouse binding '%s'", binding.c_str());
+      return false;
+    }
+  }
+
   if (StringUtil::StartsWith(device, "Controller"))
   {
     if (!m_controller_interface)
@@ -1227,6 +1263,18 @@ bool CommonHostInterface::AddAxisToInputMap(const std::string& binding, const st
 
       return true;
     }
+    else if (StringUtil::StartsWith(axis, "Button") && axis_type == Controller::AxisType::Half)
+    {
+      const std::optional<int> button_index = StringUtil::FromChars<int>(axis.substr(6));
+      if (!button_index ||
+          !m_controller_interface->BindControllerButtonToAxis(*controller_index, *button_index, std::move(handler)))
+      {
+        Log_WarningPrintf("Failed to bind controller button '%s' to axis", binding.c_str());
+        return false;
+      }
+
+      return true;
+    }
 
     Log_WarningPrintf("Malformed controller binding '%s' in button", binding.c_str());
     return false;
@@ -1533,7 +1581,7 @@ void CommonHostInterface::ClearAllControllerBindings(SettingsInterface& si)
       si.DeleteValue(section_name, button.first.c_str());
 
     for (const auto& axis : Controller::GetAxisNames(ctype))
-      si.DeleteValue(section_name, axis.first.c_str());
+      si.DeleteValue(section_name, std::get<std::string>(axis).c_str());
 
     if (Controller::GetVibrationMotorCount(ctype) > 0)
       si.DeleteValue(section_name, "Rumble");
@@ -1577,8 +1625,8 @@ void CommonHostInterface::ApplyInputProfile(const char* profile_path, SettingsIn
 
     for (const auto& axis : Controller::GetAxisNames(*ctype))
     {
-      const auto key_name = TinyString::FromFormat("Axis%s", axis.first.c_str());
-      si.DeleteValue(section_name, axis.first.c_str());
+      const auto key_name = TinyString::FromFormat("Axis%s", std::get<std::string>(axis).c_str());
+      si.DeleteValue(section_name, std::get<std::string>(axis).c_str());
       const std::vector<std::string> bindings = profile.GetStringList(section_name, key_name);
       for (const std::string& binding : bindings)
         si.AddToStringList(section_name, key_name, binding.c_str());
@@ -1636,7 +1684,7 @@ bool CommonHostInterface::SaveInputProfile(const char* profile_path, SettingsInt
 
     for (const auto& axis : Controller::GetAxisNames(ctype))
     {
-      const auto key_name = TinyString::FromFormat("Axis%s", axis.first.c_str());
+      const auto key_name = TinyString::FromFormat("Axis%s", std::get<std::string>(axis).c_str());
       const std::vector<std::string> bindings = si.GetStringList(section_name, key_name);
       for (const std::string& binding : bindings)
         profile.AddToStringList(section_name, key_name, binding.c_str());

src/frontend-common/common_host_interface.h

@@ -1,5 +1,6 @@
 #pragma once
 #include "common/string.h"
+#include "core/controller.h"
 #include "core/host_interface.h"
 #include <atomic>
 #include <functional>
@@ -195,7 +196,8 @@ protected:
   virtual bool AddButtonToInputMap(const std::string& binding, const std::string_view& device,
                                    const std::string_view& button, InputButtonHandler handler);
   virtual bool AddAxisToInputMap(const std::string& binding, const std::string_view& device,
-                                 const std::string_view& axis, InputAxisHandler handler);
+                                 const std::string_view& axis, Controller::AxisType axis_type,
+                                 InputAxisHandler handler);
   virtual bool AddRumbleToInputMap(const std::string& binding, u32 controller_index, u32 num_motors);
 
   /// Reloads the input map from config. Callable from controller interface.

src/frontend-common/controller_interface.h

@@ -3,9 +3,9 @@
 #include "core/types.h"
 #include <array>
 #include <functional>
-#include <optional>
 #include <map>
 #include <mutex>
+#include <optional>
 
 class HostInterface;
 class Controller;
@@ -54,6 +54,7 @@ public:
   virtual bool BindControllerButton(int controller_index, int button_number, ButtonCallback callback) = 0;
   virtual bool BindControllerAxisToButton(int controller_index, int axis_number, bool direction,
                                           ButtonCallback callback) = 0;
+  virtual bool BindControllerButtonToAxis(int controller_index, int button_number, AxisCallback callback) = 0;
 
   virtual void PollEvents() = 0;
 

src/frontend-common/sdl_controller_interface.cpp

@@ -35,8 +35,7 @@ bool SDLControllerInterface::Initialize(CommonHostInterface* host_interface)
     Log_InfoPrintf("Loading game controller mappings from '%s'", gcdb_file_name.c_str());
     if (SDL_GameControllerAddMappingsFromFile(gcdb_file_name.c_str()) < 0)
     {
-      Log_ErrorPrintf("SDL_GameControllerAddMappingsFromFile(%s) failed: %s",
-                      gcdb_file_name.c_str(), SDL_GetError());
+      Log_ErrorPrintf("SDL_GameControllerAddMappingsFromFile(%s) failed: %s", gcdb_file_name.c_str(), SDL_GetError());
     }
   }
 
@@ -293,6 +292,19 @@ bool SDLControllerInterface::BindControllerAxisToButton(int controller_index, in
   return true;
 }
 
+bool SDLControllerInterface::BindControllerButtonToAxis(int controller_index, int button_number, AxisCallback callback)
+{
+  auto it = GetControllerDataForPlayerId(controller_index);
+  if (it == m_controllers.end())
+    return false;
+
+  if (button_number < 0 || button_number >= MAX_NUM_BUTTONS)
+    return false;
+
+  it->button_axis_mapping[button_number] = std::move(callback);
+  return true;
+}
+
 bool SDLControllerInterface::HandleControllerAxisEvent(const SDL_Event* ev)
 {
   const float value = static_cast<float>(ev->caxis.value) / (ev->caxis.value < 0 ? 32768.0f : 32767.0f);
@@ -350,11 +362,20 @@ bool SDLControllerInterface::HandleControllerButtonEvent(const SDL_Event* ev)
     return true;
 
   const ButtonCallback& cb = it->button_mapping[ev->cbutton.button];
-  if (!cb)
-    return false;
+  if (cb)
+  {
+    cb(pressed);
+    return true;
+  }
 
-  cb(pressed);
-  return true;
+  // Assume a half-axis, i.e. in 0..1 range
+  const AxisCallback& axis_cb = it->button_axis_mapping[ev->cbutton.button];
+  if (axis_cb)
+  {
+    axis_cb(pressed ? 1.0f : 0.0f);
+  }
+
+  return false;
 }
 
 u32 SDLControllerInterface::GetControllerRumbleMotorCount(int controller_index)

src/frontend-common/sdl_controller_interface.h

@@ -1,10 +1,10 @@
 #pragma once
-#include "core/types.h"
 #include "controller_interface.h"
+#include "core/types.h"
 #include <array>
 #include <functional>
-#include <vector>
 #include <mutex>
+#include <vector>
 
 union SDL_Event;
 
@@ -27,7 +27,9 @@ public:
   // Binding to events. If a binding for this axis/button already exists, returns false.
   bool BindControllerAxis(int controller_index, int axis_number, AxisCallback callback) override;
   bool BindControllerButton(int controller_index, int button_number, ButtonCallback callback) override;
-  bool BindControllerAxisToButton(int controller_index, int axis_number, bool direction, ButtonCallback callback) override;
+  bool BindControllerAxisToButton(int controller_index, int axis_number, bool direction,
+                                  ButtonCallback callback) override;
+  bool BindControllerButtonToAxis(int controller_index, int button_number, AxisCallback callback) override;
 
   // Changing rumble strength.
   u32 GetControllerRumbleMotorCount(int controller_index) override;
@@ -59,6 +61,7 @@ private:
     std::array<AxisCallback, MAX_NUM_AXISES> axis_mapping;
     std::array<ButtonCallback, MAX_NUM_BUTTONS> button_mapping;
     std::array<std::array<ButtonCallback, 2>, MAX_NUM_AXISES> axis_button_mapping;
+    std::array<AxisCallback, MAX_NUM_BUTTONS> button_axis_mapping;
   };
 
   using ControllerDataVector = std::vector<ControllerData>;

src/frontend-common/xinput_controller_interface.cpp

@@ -204,6 +204,19 @@ bool XInputControllerInterface::BindControllerAxisToButton(int controller_index,
   return true;
 }
 
+bool XInputControllerInterface::BindControllerButtonToAxis(int controller_index, int button_number,
+                                                           AxisCallback callback)
+{
+  if (static_cast<u32>(controller_index) >= m_controllers.size() || !m_controllers[controller_index].connected)
+    return false;
+
+  if (button_number < 0 || button_number >= MAX_NUM_BUTTONS)
+    return false;
+
+  m_controllers[controller_index].button_axis_mapping[button_number] = std::move(callback);
+  return true;
+}
+
 bool XInputControllerInterface::HandleAxisEvent(u32 index, Axis axis, s32 value)
 {
   const float f_value = static_cast<float>(value) / (value < 0 ? 32768.0f : 32767.0f);
@@ -255,10 +268,18 @@ bool XInputControllerInterface::HandleButtonEvent(u32 index, u32 button, bool pr
     return true;
 
   const ButtonCallback& cb = m_controllers[index].button_mapping[button];
-  if (!cb)
-    return false;
+  if (cb)
+  {
+    cb(pressed);
+    return true;
+  }
 
-  cb(pressed);
+  // Assume a half-axis, i.e. in 0..1 range
+  const AxisCallback& axis_cb = m_controllers[index].button_axis_mapping[button];
+  if (axis_cb)
+  {
+    axis_cb(pressed ? 1.0f : 0.0f);
+  }
   return true;
 }
 

src/frontend-common/xinput_controller_interface.h

@@ -26,6 +26,7 @@ public:
   bool BindControllerButton(int controller_index, int button_number, ButtonCallback callback) override;
   bool BindControllerAxisToButton(int controller_index, int axis_number, bool direction,
                                   ButtonCallback callback) override;
+  bool BindControllerButtonToAxis(int controller_index, int button_number, AxisCallback callback) override;
 
   // Changing rumble strength.
   u32 GetControllerRumbleMotorCount(int controller_index) override;
@@ -68,6 +69,7 @@ private:
     std::array<AxisCallback, MAX_NUM_AXISES> axis_mapping;
     std::array<ButtonCallback, MAX_NUM_BUTTONS> button_mapping;
     std::array<std::array<ButtonCallback, 2>, MAX_NUM_AXISES> axis_button_mapping;
+    std::array<AxisCallback, MAX_NUM_BUTTONS> button_axis_mapping;
   };
 
   using ControllerDataArray = std::array<ControllerData, XUSER_MAX_COUNT>;