reduce sim rate to improve performance

main.c

@@ -20,6 +20,8 @@ struct SDL_Window* make_window(void) {
     if (SDL_Init(SDL_INIT_EVERYTHING) != 0) { 
         printf("error initializing SDL: %s\n", SDL_GetError()); 
     } 
+
+
     return SDL_CreateWindow("sdl_tester", 
                                        SDL_WINDOWPOS_CENTERED, 
                                        SDL_WINDOWPOS_CENTERED, 
@@ -55,13 +57,22 @@ void redraw(struct SDL_Renderer * ren) {
     SDL_RenderPresent(ren);
 }
 
+int physics_loop(void *ptr) {
+    while (true) {
+        SDL_Delay(10);
+        step(10);
+    }
+}
+
 int main ()  {
     LOGLEVEL = DEBUG;
     STDOUTLEVEL = DEBUG;
 
+    SDL_SetHint( SDL_HINT_RENDER_SCALE_QUALITY, "2" );
+
     logwrite(INFO, "Starting\n");
     SDL_Window * win = make_window();
-    SDL_Renderer * ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
+    SDL_Renderer * ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
 
     queue_for_cleanup(win, WINDOW);
     queue_for_cleanup(ren, RENDERER);
@@ -76,11 +87,14 @@ int main ()  {
     int close = 0;
 
     //draw_pictures(ren);
+    
+    SDL_Thread *physics_thread;
+    int ignore;
+    physics_thread = SDL_CreateThread(physics_loop, "Physics", (void *)NULL);
 
     bool once = true;
     startgame(ren);
     while (!close)  {
-        step(100);
 
         /* Redraw Screen */
         redraw(ren);