chore: initial commit

Packages/com.opsive.behaviordesigner/Runtime/Groups/TraversalSystemGroup.cs

@@ -0,0 +1,76 @@
+#if GRAPH_DESIGNER
+/// ---------------------------------------------
+/// Behavior Designer
+/// Copyright (c) Opsive. All Rights Reserved.
+/// https://www.opsive.com
+/// ---------------------------------------------
+namespace Opsive.BehaviorDesigner.Runtime.Groups
+{
+    using Opsive.BehaviorDesigner.Runtime.Systems;
+    using Unity.Entities;
+
+    /// <summary>
+    /// Main group for the systems that are responsible for traversing the behavior tree.
+    /// </summary>
+    [UpdateInGroup(typeof(BehaviorTreeSystemGroup))]
+    [UpdateAfter(typeof(InterruptSystemGroup))]
+    public partial class TraversalSystemGroup : ComponentSystemGroup
+    {
+        private SystemHandle m_EvaluationSystemHandle;
+        private SystemHandle m_DetermineEvaluationSystemHandle;
+
+        /// <summary>
+        /// The group has been created.
+        /// </summary>
+        protected override void OnCreate()
+        {
+            base.OnCreate();
+
+            m_EvaluationSystemHandle = World.GetExistingSystem<EvaluationSystem>();
+            m_DetermineEvaluationSystemHandle = World.GetExistingSystem<DetermineEvaluationSystem>();
+        }
+
+        /// <summary>
+        /// Updates the systems. Determines if the systems need to keep being evaluated.
+        /// </summary>
+        protected override void OnUpdate()
+        {
+#if UNITY_EDITOR
+            var count = 0;
+#endif
+            bool evaluate;
+            do {
+                base.OnUpdate();
+
+                var determineEvaluationSystem = EntityManager.WorldUnmanaged.GetUnsafeSystemRef<DetermineEvaluationSystem>(m_DetermineEvaluationSystemHandle);
+                determineEvaluationSystem.Complete(EntityManager);
+                evaluate = determineEvaluationSystem.Evaluate;
+
+                var evaluationSystem = EntityManager.WorldUnmanaged.GetUnsafeSystemRef<EvaluationSystem>(m_EvaluationSystemHandle);
+                evaluationSystem.Complete(EntityManager);
+
+#if UNITY_EDITOR
+                if (evaluate) {
+                    count++;
+                    if (count == ushort.MaxValue / 10) {
+                        UnityEngine.Debug.LogWarning("An infinite loop would have been caused by the TraversalSystemGroup. Please email support@opsive.com with steps to reproduce this error.");
+                        break;
+                    }
+                }
+#endif
+            } while (evaluate);
+        }
+
+        /// <summary>
+        /// The group has stopped running.
+        /// </summary>
+        protected override void OnStopRunning()
+        {
+            base.OnStopRunning();
+
+            var evaluationSystem = EntityManager.WorldUnmanaged.GetUnsafeSystemRef<EvaluationSystem>(m_EvaluationSystemHandle);
+            evaluationSystem.Complete(EntityManager, true);
+        }
+    }
+}
+#endif