Tweak zippers to give less motion blur, and start adding some fire coming out of the kart which atm only really works for ground zippers

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@9457 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/graphics/post_processing.cpp

@@ -105,7 +105,7 @@ void PostProcessing::update(float dt)
 {
     if (m_boost_amount > 0.0f)
     {
-        m_boost_amount -= dt*5.0f;
+        m_boost_amount -= dt*3.5f;
         if (m_boost_amount < 0.0f) m_boost_amount = 0.0f;
     }
 }
@@ -137,7 +137,7 @@ void PostProcessing::render()
 /** Set the boost amount according to the speed of the camera */
 void PostProcessing::giveBoost()
 {
-    m_boost_amount = 5.0f;
+    m_boost_amount = 2.5f;
     //printf("setCameraSpeed(%f)\n", cam_speed);
     //m_boost_amount = core::clamp(MOTION_BLUR_FACTOR * (cam_speed - MOTION_BLUR_OFFSET), 0.0f, 1.0f);
 }

src/karts/controller/player_controller.cpp

@@ -391,6 +391,8 @@ void PlayerController::handleZipper(bool play_sound)
     // Apply the motion blur according to the speed of the kart
     irr_driver->getPostProcessing()->giveBoost();
     
+    m_kart->showZipperFire();
+
 }   // handleZipper
 
 //-----------------------------------------------------------------------------

src/karts/kart.cpp

@@ -902,7 +902,10 @@ void Kart::update(float dt)
         if     (material->isDriveReset() && isOnGround())
             forceRescue();
         else if(material->isZipper()     && isOnGround())
+        {
             handleZipper(material);
+            showZipperFire();
+        }
         else
         {
             MaxSpeed::setSlowdown(MaxSpeed::MS_DECREASE_TERRAIN,
@@ -953,6 +956,16 @@ void Kart::update(float dt)
     }
 }   // update
 
+//-----------------------------------------------------------------------------
+
+/**
+  * Show fire to go with a zipper
+  */
+void Kart::showZipperFire()
+{
+    m_nitro->setCreationRate(800.0f);
+}
+
 //-----------------------------------------------------------------------------
 /** Squashes this kart: it will scale the kart in up direction, and causes
  *  a slowdown while this kart is squashed.

src/karts/kart.hpp

@@ -239,6 +239,7 @@ public:
     virtual void   update           (float dt);
     virtual void   finishedRace     (float time);
     void           beep             ();
+    void           showZipperFire   ();
     bool           playCustomSFX    (unsigned int type);
     void           setController(Controller *controller);
     // ------------------------------------------------------------------------