Preload the particle textures when first load

This prevent hangs when lazy loading texture runtime

src/graphics/material.cpp

@@ -174,9 +174,12 @@ Material::Material(const XMLNode *node, bool deprecated)
             // backwards compatibility
             node->get("crash-reset-particles", &m_collision_particles);
         }
+        if (!m_collision_particles.empty())
+        {
+            ParticleKindManager::get()->getParticles(m_collision_particles);
+        }
     }
 
-
     s = "";
     if (node->get("shader", &s))
     {

src/graphics/particle_kind.cpp

@@ -200,6 +200,8 @@ ParticleKind::ParticleKind(const std::string &file)
     {
         material_manager->pushTempMaterial(materials, file);
         m_material_file = material_manager->getLatestMaterial()->getTexFname();
+        // Preload textures
+        getMaterial();
     }
 
     // ------------------------------------------------------------------------

src/main.cpp

@@ -1461,8 +1461,6 @@ void initRest()
 
     race_manager->setTrack(UserConfigParams::m_last_track);
 
-    // Preload the explosion effects (explode.png)
-    ParticleKindManager::get()->getParticles("explosion.xml");
 }   // initRest
 
 //=============================================================================
@@ -1564,6 +1562,9 @@ int main(int argc, char *argv[] )
         main_loop = new MainLoop();
         material_manager->loadMaterial();
 
+        // Preload the explosion effects (explode.png)
+        ParticleKindManager::get()->getParticles("explosion.xml");
+
         GUIEngine::addLoadingIcon( irr_driver->getTexture(FileManager::GUI,
                                                           "options_video.png"));
         kart_properties_manager -> loadAllKarts    ();