Mario: only visit objects if they entered screen at least once

mario/main.cpp

@@ -142,8 +142,12 @@ void doInput( std::shared_ptr< SDLPP::Scene > scene ) {
         std::lock_guard< std::mutex > lock( render_mutex );
         scene->updateScene();
         auto prev_coin_count = coin_count;
-        // TODO only start doing visits once the object has been on screen at least once
+        auto rightmost_x = renderer->getDoubleDimensions().getX();
         for(size_t i = 0; i < moving_objects.size(); i++) {
+            moving_objects[i]->checkVisibility(rightmost_x);
+            if(!moving_objects[i]->wasVisible()) {
+                continue;
+            }
             auto visitor =
                 getVisitor( *moving_objects[i], *scene, quit, coin_count, moving_objects );
             scene->visitCollisions( *moving_objects[i], *visitor );