Fixed #2327.

src/config/user_config.hpp

@@ -520,6 +520,9 @@ namespace UserConfigParams
     /** True if physics debugging should be enabled. */
     PARAM_PREFIX bool m_physics_debug PARAM_DEFAULT( false );
 
+    /** True if fps should be printed each frame. */
+    PARAM_PREFIX bool m_fps_debug PARAM_DEFAULT(false);
+
     /** True if slipstream debugging is activated. */
     PARAM_PREFIX bool m_slipstream_debug  PARAM_DEFAULT( false );
 

src/main.cpp

@@ -762,6 +762,8 @@ int handleCmdLine()
         UserConfigParams::m_rendering_debug=true;
     if(CommandLine::has("--ai-debug"))
         AIBaseController::enableDebug();
+    if (CommandLine::has("--fps-debug"))
+        UserConfigParams::m_fps_debug = true;
 
     if(UserConfigParams::m_artist_debug_mode)
     {

src/main_loop.cpp

@@ -67,6 +67,24 @@ float MainLoop::getLimitedDt()
     {
         m_curr_time = device->getTimer()->getRealTime();
         dt = (float)(m_curr_time - m_prev_time);
+        const World* const world = World::getWorld();
+        if (UserConfigParams::m_fps_debug && world)
+        {
+            const LinearWorld *lw = dynamic_cast<const LinearWorld*>(world);
+            if (lw)
+            {
+                Log::verbose("fps", "time %f distance %f dt %f fps %f",
+                             lw->getTime(),
+                             lw->getDistanceDownTrackForKart(0),
+                             dt*0.001f, 1000.0f / dt);
+            }
+            else
+            {
+                Log::verbose("fps", "time %f dt %f fps %f",
+                             world->getTime(), dt*0.001f, 1000.0f / dt);
+            }
+
+        }
 
         // don't allow the game to run slower than a certain amount.
         // when the computer can't keep it up, slow down the shown time instead