Qt: Implement relative mouse mode

src/core/controller.cpp

@@ -47,7 +47,7 @@ float Controller::GetVibrationMotorStrength(u32 motor)
 
 void Controller::LoadSettings(const char* section) {}
 
-bool Controller::GetSoftwareCursor(const Common::RGBA8Image** image, float* image_scale)
+bool Controller::GetSoftwareCursor(const Common::RGBA8Image** image, float* image_scale, bool* relative_mode)
 {
   return false;
 }

src/core/controller.h

@@ -64,7 +64,7 @@ public:
   virtual void LoadSettings(const char* section);
 
   /// Returns the software cursor to use for this controller, if any.
-  virtual bool GetSoftwareCursor(const Common::RGBA8Image** image, float* image_scale);
+  virtual bool GetSoftwareCursor(const Common::RGBA8Image** image, float* image_scale, bool* relative_mode);
 
   /// Creates a new controller of the specified type.
   static std::unique_ptr<Controller> Create(ControllerType type, u32 index);

src/core/host_interface.cpp

@@ -917,20 +917,28 @@ void HostInterface::UpdateSoftwareCursor()
 {
   if (System::IsShutdown())
   {
+    SetMouseMode(false, false);
     m_display->ClearSoftwareCursor();
     return;
   }
 
   const Common::RGBA8Image* image = nullptr;
   float image_scale = 1.0f;
+  bool relative_mode = false;
+  bool hide_cursor = false;
 
   for (u32 i = 0; i < NUM_CONTROLLER_AND_CARD_PORTS; i++)
   {
     Controller* controller = System::GetController(i);
-    if (controller && controller->GetSoftwareCursor(&image, &image_scale))
+    if (controller && controller->GetSoftwareCursor(&image, &image_scale, &relative_mode))
+    {
+      hide_cursor = true;
       break;
+    }
   }
 
+  SetMouseMode(relative_mode, hide_cursor);
+
   if (image && image->IsValid())
   {
     m_display->SetSoftwareCursor(image->GetPixels(), image->GetWidth(), image->GetHeight(), image->GetByteStride(),
@@ -967,6 +975,8 @@ void HostInterface::RecreateSystem()
   System::ResetPerformanceCounters();
 }
 
+void HostInterface::SetMouseMode(bool relative, bool hide_cursor) {}
+
 void HostInterface::DisplayLoadingScreen(const char* message, int progress_min /*= -1*/, int progress_max /*= -1*/,
                                          int progress_value /*= -1*/)
 {

src/core/host_interface.h

@@ -175,6 +175,9 @@ protected:
   /// Switches the GPU renderer by saving state, recreating the display window, and restoring state (if needed).
   virtual void RecreateSystem();
 
+  /// Enables "relative" mouse mode, locking the cursor position and returning relative coordinates.
+  virtual void SetMouseMode(bool relative, bool hide_cursor);
+
   /// Sets the user directory to the program directory, i.e. "portable mode".
   void SetUserDirectoryToProgramDirectory();
 

src/core/namco_guncon.cpp

@@ -280,12 +280,13 @@ void NamcoGunCon::LoadSettings(const char* section)
   m_x_scale = g_host_interface->GetFloatSettingValue(section, "XScale", 1.0f);
 }
 
-bool NamcoGunCon::GetSoftwareCursor(const Common::RGBA8Image** image, float* image_scale)
+bool NamcoGunCon::GetSoftwareCursor(const Common::RGBA8Image** image, float* image_scale, bool* relative_mode)
 {
   if (!m_crosshair_image.IsValid())
     return false;
 
   *image = &m_crosshair_image;
   *image_scale = m_crosshair_image_scale;
+  *relative_mode = false;
   return true;
 }

src/core/namco_guncon.h

@@ -34,7 +34,7 @@ public:
   void Reset() override;
   bool DoState(StateWrapper& sw, bool apply_input_state) override;
   void LoadSettings(const char* section) override;
-  bool GetSoftwareCursor(const Common::RGBA8Image** image, float* image_scale) override;
+  bool GetSoftwareCursor(const Common::RGBA8Image** image, float* image_scale, bool* relative_mode) override;
 
   void SetAxisState(s32 axis_code, float value) override;
   void SetButtonState(s32 button_code, bool pressed) override;

src/core/playstation_mouse.h

@@ -39,6 +39,8 @@ public:
 
   void SetButtonState(Button button, bool pressed);
 
+  bool GetSoftwareCursor(const Common::RGBA8Image** image, float* image_scale, bool* relative_mode) override;
+
 private:
   void UpdatePosition();