diff --git a/src/platform/sdl/sdlinput.cpp b/src/platform/sdl/sdlinput.cpp
index 79c149a4..ea51fe16 100644
--- a/src/platform/sdl/sdlinput.cpp
+++ b/src/platform/sdl/sdlinput.cpp
@@ -231,6 +231,10 @@ void SdlInputData::Tick(float seconds)
         m_mouse->SetAxis(1,-(mouse.y - vprevmouse.y) * 100.0f / max_screen_size);
     }
 
+    //Mouse is focused, Validate the InScreen Key
+    //Hardcoded 3, not very nice.
+    m_mouse->SetKey(3, !!(SDL_GetAppState() & SDL_APPMOUSEFOCUS));
+
     if (m_mousecapture)
     {
         mouse = ivec2(m_app * .5f);
diff --git a/test/meshviewer.cpp b/test/meshviewer.cpp
index 9bb90313..fd175489 100644
--- a/test/meshviewer.cpp
+++ b/test/meshviewer.cpp
@@ -101,6 +101,7 @@ enum MVMouseKeyList
     MSE_CAM_ROT = KEY_MAX,
     MSE_CAM_POS,
     MSE_CAM_FOV,
+    MSE_FOCUS,
 
     MSE_MAX
 };
@@ -237,6 +238,7 @@ public:
             m_controller->GetKey(MSE_CAM_ROT).BindMouse("Left");
             m_controller->GetKey(MSE_CAM_POS).BindMouse("Right");
             m_controller->GetKey(MSE_CAM_FOV).BindMouse("Middle");
+            m_controller->GetKey(MSE_FOCUS).BindMouse("InScreen");
             m_controller->GetAxis(MSEX_CAM_Y).BindMouse("Y");
             m_controller->GetAxis(MSEX_CAM_X).BindMouse("X");
         }
@@ -372,7 +374,7 @@ public:
         is_pos = KeyDown(KEY_CAM_POS) || KeyDown(MSE_CAM_POS);
         is_fov = KeyDown(KEY_CAM_FOV) || KeyDown(MSE_CAM_FOV);
 
-        if (KeyDown(MSE_CAM_ROT) || KeyDown(MSE_CAM_POS) || KeyDown(MSE_CAM_FOV))
+        if (KeyDown(MSE_FOCUS) && (KeyDown(MSE_CAM_ROT) || KeyDown(MSE_CAM_POS) || KeyDown(MSE_CAM_FOV)))
         {
             tmpv += vec2(AxisValue(MSEX_CAM_Y), AxisValue(MSEX_CAM_X));
             if (KeyDown(MSE_CAM_ROT))