Added a 'loading' screen, so that the game does not seem unresponsive when loading a big track

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@4810 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/guiengine/engine.cpp

@@ -291,6 +291,38 @@ void render(float elapsed_time)
 #endif
 }   // render
 
+// -----------------------------------------------------------------------------    
+
+void renderLoading()
+{
+    g_skin->drawBgImage();
+    ITexture* loading = irr_driver->getTexture( file_manager->getGUIDir() + "/loading.png" );
+    
+    const int texture_w = loading->getSize().Width;
+    const int texture_h = loading->getSize().Height;
+    
+    core::dimension2d<u32> frame_size = GUIEngine::getDriver()->getCurrentRenderTargetSize();
+    const int screen_w = frame_size.Width;
+    const int screen_h = frame_size.Height;
+    
+    const core::rect< s32 > dest_area = core::rect< s32 >(screen_w/2 - texture_w/2,
+                                                          screen_h/2 - texture_h/2,
+                                                          screen_w/2 + texture_w/2,
+                                                          screen_h/2 + texture_h/2);
+    
+    const core::rect< s32 > source_area = core::rect< s32 >(0, 0, texture_w, texture_h);
+    
+    GUIEngine::getDriver()->draw2DImage( loading, dest_area, source_area,
+                                        0 /* no clipping */, 0, true /* alpha */);
+    
+    
+    g_title_font->draw(_("Loading"),
+                       core::rect< s32 >( 0, screen_h/2 + texture_h/2, screen_w, screen_h ),
+                       SColor(255,255,255,255),
+                       true/* center h */, false /* center v */ );
+    
+} // renderLoading
+    
 // -----------------------------------------------------------------------------    
 Widget* getWidget(const char* name)
 {

src/guiengine/engine.hpp

@@ -299,6 +299,7 @@ namespace GUIEngine
     void reshowCurrentScreen();
     
     void render(float dt);
+    void renderLoading();
     
     void transmitEvent(Widget* widget, std::string& name, const int playerID);
     

src/race/race_manager.cpp

@@ -207,6 +207,12 @@ void RaceManager::startNew()
  */
 void RaceManager::startNextRace()
 {
+    IrrlichtDevice* device = irr_driver->getDevice();
+    GUIEngine::renderLoading();
+    device->getVideoDriver()->endScene();
+    device->getVideoDriver()->beginScene(true, true, video::SColor(255,100,101,140));
+
+    
     m_num_finished_karts   = 0;
     m_num_finished_players = 0;