Sdl2Application: support for relative position in mouse move event.

src/Platform/Sdl2Application.cpp

@@ -117,7 +117,7 @@ int Sdl2Application::exec() {
                     } break;
 
                 case SDL_MOUSEMOTION: {
-                    MouseMoveEvent e({event.motion.x, event.motion.y});
+                    MouseMoveEvent e({event.motion.x, event.motion.y}, {event.motion.xrel, event.motion.yrel});
                     mouseMoveEvent(e);
                     break;
                 }

src/Platform/Sdl2Application.h

@@ -371,6 +371,13 @@ class Sdl2Application::MouseMoveEvent: public Sdl2Application::InputEvent {
         /** @brief Position */
         inline Math::Vector2<int> position() const { return _position; }
 
+        /**
+         * @brief Relative position
+         *
+         * Position relative to previous event
+         */
+        inline Math::Vector2<int> relativePosition() const { return _relativePosition; }
+
         /**
          * @brief Modifiers
          *
@@ -379,9 +386,9 @@ class Sdl2Application::MouseMoveEvent: public Sdl2Application::InputEvent {
         Modifiers modifiers();
 
     private:
-        inline MouseMoveEvent(const Math::Vector2<int>& position): _position(position), modifiersLoaded(false) {}
+        inline MouseMoveEvent(const Math::Vector2<int>& position, const Math::Vector2<int>& relativePosition): _position(position), _relativePosition(relativePosition), modifiersLoaded(false) {}
 
-        const Math::Vector2<int> _position;
+        const Math::Vector2<int> _position, _relativePosition;
         bool modifiersLoaded;
         Modifiers _modifiers;
 };