Fix possible segfault

sdlpp.hpp

@@ -113,6 +113,12 @@ public:
     bool getRenderColiders() {
         return render_coliders;
     }
+    void clearRenderer() {
+        SDL_RenderClear( getRendererPtr() );
+    }
+    void presentRenderer() {
+        SDL_RenderPresent( getRendererPtr() );
+    }
 
 private:
     SDL_Renderer *renderer = NULL;
@@ -562,10 +568,10 @@ public:
         }
         return ret;
     }
-    void renderScene( bool clear_scene = true ) {
+    void renderScene( bool clear_renderer = true ) {
         checkKilled();
         render_mutex.lock();
-        if ( clear_scene )
+        if ( clear_renderer )
             SDL_RenderClear( renderer->getRendererPtr() );
         if ( background && background->getTexturePtr() )
             SDL_RenderCopy( renderer->getRendererPtr(),

tetris/scenes.cpp

@@ -316,6 +316,11 @@ void handleKeyDownMain( SDL_Keycode key, SDLPP::Scene &scene ) {
             g_cur_shadow->rotate();
         updateShadow(scene);
         break;
+    case SDLK_SPACE:
+        if(!g_cur_object)
+            break;
+        g_cur_object->setPos(g_cur_shadow->getPos());
+        break;
     case SDLK_r:
         scene.getRenderer().setRenderColiders(
             !scene.getRenderer().getRenderColiders() );
@@ -565,6 +570,16 @@ void gameOverSceneInput( std::shared_ptr< SDLPP::Scene > /*UNUSED*/, int /*UNUSE
     pollEventsGameOver();
 }
 
+void saveOptions() {
+    g_update_colors = true;
+    if(g_cur_shadow)
+        g_cur_shadow->setHidden(!g_show_shadow);
+    g_pause = 0;
+    g_main_scene->setPrevTicks( SDL_GetTicks() );
+    g_active_scenes.pop_back();
+    g_input_functions.pop_back();
+}
+
 void handleKeyDownOptions( SDL_Keycode key ) {
     switch ( key ) {
     case SDLK_r:
@@ -626,24 +641,14 @@ void handleKeyDownOptions( SDL_Keycode key ) {
     case SDLK_RETURN:
         switch ( g_options_select ) {
         case 2:
-            g_update_colors = true;
-            g_cur_shadow->setHidden(!g_show_shadow);
-            g_pause = 0;
-            g_main_scene->setPrevTicks( SDL_GetTicks() );
-            g_active_scenes.pop_back();
-            g_input_functions.pop_back();
+            saveOptions();
             break;
         default:
             break;
         }
         break;
     case SDLK_ESCAPE:
-        g_update_colors = true;
-        g_cur_shadow->setHidden(!g_show_shadow);
-        g_pause = 0;
-        g_main_scene->setPrevTicks( SDL_GetTicks() );
-        g_active_scenes.pop_back();
-        g_input_functions.pop_back();
+        saveOptions();
     default:
         break;
     }

tetris/tetris.cpp

@@ -107,12 +107,11 @@ int main() {
             g_update_colors = false;
         }
 
-        g_main_scene->renderScene();
+        renderer->clearRenderer();
         for(auto &x : g_active_scenes) {
-            if(x != g_main_scene)
-                x->renderScene(false);
+            x->renderScene(false);
         }
-        g_main_scene->presentScene();
+        renderer->presentRenderer();
         g_wait_for_anim = false;
         frames++;
         if ( SDL_GetTicks() - base >= 1000 ) {