Use funto's motion blur effect only when using a zipper, but more visibly so

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@9456 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/graphics/camera.cpp

@@ -402,9 +402,6 @@ void Camera::getCameraSettings(float *above_kart, float *cam_angle,
  */
 void Camera::update(float dt)
 {
-    // Initially, disable motion blur
-    irr_driver->getPostProcessing()->setCameraSpeed(0.0f);
-    
     // The following settings give a debug camera which shows the track from
     // high above the kart straight down.
     if(UserConfigParams::m_camera_debug)
@@ -447,9 +444,6 @@ void Camera::update(float dt)
         m_camera->setTarget(current_target);
         return;
     }
-    
-    // Apply the motion blur according to the speed of the kart
-    irr_driver->getPostProcessing()->setCameraSpeed(m_kart->getSpeed());
 
     positionCamera(dt, above_kart, cam_angle, side_way, distance, smoothing);
 }   // update

src/graphics/irr_driver.cpp

@@ -1373,6 +1373,8 @@ void IrrDriver::update(float dt)
     
     m_video_driver->endScene();
     
+    getPostProcessing()->update(dt);
+    
     // Enable this next print statement to get render information printed
     // E.g. number of triangles rendered, culled etc. The stats is only
     // printed while the race is running and not while the in-game menu

src/graphics/post_processing.cpp

@@ -101,6 +101,15 @@ void PostProcessing::endCapture()
     irr_driver->getVideoDriver()->setRenderTarget(0, true, true, 0);
 }
 
+void PostProcessing::update(float dt)
+{
+    if (m_boost_amount > 0.0f)
+    {
+        m_boost_amount -= dt*5.0f;
+        if (m_boost_amount < 0.0f) m_boost_amount = 0.0f;
+    }
+}
+
 /** Render the post-processed scene */
 void PostProcessing::render()
 {
@@ -126,9 +135,11 @@ void PostProcessing::render()
 }
 
 /** Set the boost amount according to the speed of the camera */
-void PostProcessing::setCameraSpeed(float cam_speed)
+void PostProcessing::giveBoost()
 {
-    m_boost_amount = core::clamp(MOTION_BLUR_FACTOR * (cam_speed - MOTION_BLUR_OFFSET), 0.0f, 1.0f);
+    m_boost_amount = 5.0f;
+    //printf("setCameraSpeed(%f)\n", cam_speed);
+    //m_boost_amount = core::clamp(MOTION_BLUR_FACTOR * (cam_speed - MOTION_BLUR_OFFSET), 0.0f, 1.0f);
 }
 
 /** Implement IShaderConstantsSetCallback. Shader constants setter for post-processing */

src/graphics/post_processing.hpp

@@ -48,14 +48,16 @@ public:
     void            beginCapture();
     void            endCapture();
     
+    void            update(float dt);
+
     /** Render the post-processed scene */
     void            render();
     
     /** Is the hardware able to use post-processing? */
     inline bool     isSupported() const                 {return m_supported;}
     
-    /** Set the boost amount according to the speed of the camera */
-    void            setCameraSpeed(float cam_speed);
+    /** Use motion blur for a short time */
+    void            giveBoost();
     
     /** Implement IShaderConstantsSetCallback. Shader constants setter for post-processing */
     virtual void    OnSetConstants(video::IMaterialRendererServices *services, s32 user_data);

src/karts/controller/player_controller.cpp

@@ -387,6 +387,10 @@ void PlayerController::handleZipper(bool play_sound)
     {
         m_wee_sound->play();
     }
+    
+    // Apply the motion blur according to the speed of the kart
+    irr_driver->getPostProcessing()->giveBoost();
+    
 }   // handleZipper
 
 //-----------------------------------------------------------------------------