Delay start for 3s when intro sound is off

To bridge the silence before ready-set-go, the engines are started earlier than normal if intro sound is off.

src/modes/world_status.cpp

@@ -30,6 +30,21 @@
 
 #include <irrlicht.h>
 
+//-----------------------------------------------------------------------------
+/** Starts the kart engines.
+ */
+void WorldStatus::startEngines()
+{
+    if (m_engines_started)
+        return;
+
+    m_engines_started = true;
+    for (unsigned int i = 0; i < World::getWorld()->getNumKarts(); i++)
+    {
+        World::getWorld()->getKart(i)->startEngineSFX();
+    }
+}
+
 //-----------------------------------------------------------------------------
 WorldStatus::WorldStatus()
 {
@@ -55,6 +70,9 @@ void WorldStatus::reset()
 {
     m_time            = 0.0f;
     m_auxiliary_timer = 0.0f;
+    
+    m_engines_started = false;
+    
     // Using SETUP_PHASE will play the track into sfx first, and has no
     // other side effects.
     m_phase           = UserConfigParams::m_race_now ? MUSIC_PHASE : SETUP_PHASE;
@@ -185,6 +203,13 @@ void WorldStatus::update(const float dt)
             if (!UserConfigParams::m_sfx && m_auxiliary_timer < 3.0f)
                 return;
             
+            if (!m_play_track_intro_sound)
+            {
+                startEngines();
+                if (m_auxiliary_timer < 3.0f)
+                    return;
+            }
+
             m_auxiliary_timer = 0.0f;
 
             if (m_play_ready_set_go_sounds)
@@ -192,10 +217,7 @@ void WorldStatus::update(const float dt)
 
             m_phase = READY_PHASE;
             
-            for (unsigned int i = 0; i < World::getWorld()->getNumKarts(); i++)
+            startEngines();
-            {
-                World::getWorld()->getKart(i)->startEngineSFX();
-            }
 
             break;
         case READY_PHASE:

src/modes/world_status.hpp

@@ -114,6 +114,8 @@ private:
      */
     float           m_auxiliary_timer;
 
+    bool            m_engines_started;
+    void            startEngines();
 public:
              WorldStatus();
     virtual ~WorldStatus();