Make SdlInput regularly inject the mouse position into the Input singleton.

src/input.cpp

@@ -29,7 +29,12 @@ static class InputData
     friend class Input;
 
 public:
-    int dummy;
+    InputData()
+    {
+        mouse.x = mouse.y = -1;
+    }
+
+    Int2 mouse;
 }
 inputdata;
 
@@ -59,3 +64,13 @@ Float2 Input::GetAxis(int axis)
     return f;
 }
 
+void Input::SetMousePos(Int2 coord)
+{
+    data->mouse = coord;
+}
+
+Int2 Input::GetMousePos()
+{
+    return data->mouse;
+}
+

src/input.h

@@ -22,6 +22,8 @@ class Input
 {
 public:
     static Float2 GetAxis(int axis);
+    static void SetMousePos(Int2 coord);
+    static Int2 GetMousePos();
 };
 
 #endif // __DH_INPUT_H__

src/sdlinput.cpp

@@ -48,7 +48,12 @@ void SdlInput::TickGame(float deltams)
     Entity::TickGame(deltams);
 
     /* Handle mouse input */
-    SDL_GetMouseState(&data->mx, &data->my);
+    Int2 mouse;
+    if (SDL_GetAppState() & SDL_APPMOUSEFOCUS)
+        SDL_GetMouseState(&mouse.x, &mouse.y);
+    else
+        mouse.x = mouse.y = -1;
+    Input::SetMousePos(mouse);
 
     /* Handle keyboard and WM events */
     SDL_Event event;