Add BehaviorTreeKnowledgeBooleanDecorator

Source/Engine/AI/BehaviorTreeNodes.cpp

@@ -706,6 +706,14 @@ bool BehaviorTreeKnowledgeValuesConditionalDecorator::CanUpdate(const BehaviorUp
     return BehaviorKnowledge::CompareValues((float)ValueA.Get(context.Knowledge), (float)ValueB.Get(context.Knowledge), Comparison);
 }
 
+bool BehaviorTreeKnowledgeBooleanDecorator::CanUpdate(const BehaviorUpdateContext& context)
+{
+    Variant value = Value.Get(context.Knowledge);
+    bool result = (bool)value;
+    result ^= Invert;
+    return result;
+}
+
 bool BehaviorTreeHasTagDecorator::CanUpdate(const BehaviorUpdateContext& context)
 {
     bool result = false;

Source/Engine/AI/BehaviorTreeNodes.h

@@ -445,6 +445,27 @@ public:
     bool CanUpdate(const BehaviorUpdateContext& context) override;
 };
 
+/// <summary>
+/// Checks certain knowledge value to conditionally enter the node if the value is set (eg. not-null object reference or boolean value).
+/// </summary>
+API_CLASS(Sealed) class FLAXENGINE_API BehaviorTreeKnowledgeBooleanDecorator : public BehaviorTreeDecorator
+{
+    DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(BehaviorTreeKnowledgeBooleanDecorator, BehaviorTreeDecorator);
+    API_AUTO_SERIALIZATION();
+
+    // The value from behavior's knowledge (blackboard, goal or sensor) to check if it's set (eg. not-null object reference or boolean value).
+    API_FIELD(Attributes="EditorOrder(0)")
+    BehaviorKnowledgeSelectorAny Value;
+
+    // If checked, the condition will be inverted.
+    API_FIELD(Attributes="EditorOrder(10)")
+    bool Invert = false;
+
+public:
+    // [BehaviorTreeNode]
+    bool CanUpdate(const BehaviorUpdateContext& context) override;
+};
+
 /// <summary>
 /// Checks if certain actor (from knowledge) has a given tag assigned.
 /// </summary>