level: Set up event loop

1 files changed, 30 insertions, 2 deletions

diff --git a/src/level.c b/src/level.c
index cc15c53..8c6a1bd 100644
--- a/src/level.c
+++ b/src/level.c
@@ -106,6 +106,12 @@ _db_level_render(SDL_Renderer *renderer, struct db_level *level)
 int
 db_level_play(SDL_Renderer *renderer, struct db_level *level)
 {
+	int       fr;
+	Uint32    prv_ticks;
+	Uint32    cur_ticks;
+	Uint32    delay;
+	SDL_Event event;
+
 	db_dbg("Playing %s/%s", level->game_id, level->level_id);
 
 	level->map = db_map_new(level->game_id, level->level_id);
@@ -120,8 +126,30 @@ db_level_play(SDL_Renderer *renderer, struct db_level *level)
 			&level->target_r, &level->target_gid);
 	level->balls = db_map_get_balls(level->map);
 
-	_db_level_render(renderer, level);
-	SDL_Delay(1000);
+	fr = db_map_get_framerate(level->map);
+	prv_ticks = SDL_GetTicks();
+	while (1) {
+		while (SDL_PollEvent(&event)) {
+			switch (event.type) {
+				case SDL_QUIT:
+					return -1;
+				default:
+					break;
+			}
+		}
+		_db_level_render(renderer, level);
+		cur_ticks = SDL_GetTicks();
+		if ((Uint32) (1000 / fr) > (cur_ticks - prv_ticks)) {
+			delay = 1000 / fr - (cur_ticks - prv_ticks);
+		} else {
+			db_warn("Frame took longer than frame period");
+			delay = 0;
+		}
+		db_dbg("Frame took %u ms, delaying %u ms",
+				cur_ticks - prv_ticks, delay);
+		SDL_Delay(delay);
+		prv_ticks = cur_ticks;
+	}
 
 	return 0;
 }