twn_loop.c: limit minimum amount of delay

src/twn_loop.c

@@ -252,7 +252,7 @@ static void main_loop(void) {
     /*       which for now is broken as glBufferData with NULL is used all over right after render */
     if (frames != 0)
         render();
-    else
+    else if (ctx.desired_frametime - ctx.frame_accumulator > 1000000)
         /* don't waste clock cycles on useless work */
         /* TODO: make it adjustable from config */
         SDL_Delay((uint32_t)(ctx.desired_frametime - ctx.frame_accumulator) / 1250000);