Add state-based effect.

Assets/Cryville/Crtr/EffectGroup.cs

@@ -35,10 +35,14 @@ namespace Cryville.Crtr {
 			while (_endQueue.Count > 0) {
 				var item = _endQueue[0];
 				if (item.EndTime > _time) break;
-				item.OnDone();
-				_instances.Remove(item.Index);
-				_pool.Return(item);
 				_endQueue.RemoveAt(0);
+				if (item.OnStateDone()) {
+					QueueInstance(item);
+				}
+				else {
+					_instances.Remove(item.Index);
+					_pool.Return(item);
+				}
 			}
 			foreach (var instance in _instances) {
 				instance.Value.Tick(time);
@@ -46,18 +50,21 @@ namespace Cryville.Crtr {
 		}
 		public void Emit(float index) {
 			EffectInstance instance;
-			if (_instances.TryGetValue(index, out instance)) {
-				var i = _endQueue.BinarySearch(instance);
-				_endQueue.RemoveAt(i);
-			}
-			else {
-				_instances.Add(index, instance = _pool.Rent());
-			}
-			instance.Rewind(_time);
+			bool flag = _instances.TryGetValue(index, out instance);
+			if (!flag) _instances.Add(index, instance = _pool.Rent());
 			instance.Index = index;
-			instance.OnEmit(_time);
-			var i2 = ~_endQueue.BinarySearch(instance);
-			_endQueue.Insert(i2, instance);
+			if (instance.CanEmit()) {
+				if (flag) {
+					var i = _endQueue.BinarySearch(instance);
+					_endQueue.RemoveAt(i);
+				}
+				instance.OnEmit(_time);
+				QueueInstance(instance);
+			}
+		}
+		void QueueInstance(EffectInstance i) {
+			var index = ~_endQueue.BinarySearch(i);
+			_endQueue.Insert(index, i);
 		}
 		public void Dispose() {
 			_pool.DisposeAll();