Start of state system rework

Source/UnrealFightingFramework/State/FFState.cpp

@@ -5,51 +5,60 @@
 // FF includes
 #include "FFStateMachineComponent.h"
 
-void UFFState::InitActorInfo(AActor* InOwner, AActor* InAvatar)
+
+void UFFStateBehavior::Enter(const FFFStateContext& InStateContext)
 {
-    Owner = InOwner;
+    OnEnter(InStateContext);
-	Avatar = InAvatar;
 }
 
 
-void UFFState::Enter()
+void UFFStateBehavior::Exit(const FFFStateContext& InStateContext)
 {
-    TicksInState = 0;
+    OnExit(InStateContext);
-
-    OnEnter();
 }
 
 
-void UFFState::Exit()
+void UFFStateBehavior::Update(float OneFrame, const FFFStateContext& InStateContext)
 {
-    OnExit();
+    OnUpdate(OneFrame, InStateContext);
 }
 
-
+void UFFStateBehavior::OnLanded_Implementation(const FFFStateContext& InStateContext)
-void UFFState::Update(float OneFrame)
-{
-    TicksInState++;
-
-    OnUpdate(OneFrame);
-}
-
-
-void UFFState::OnEnter_Implementation()
 {
 }
 
 
-void UFFState::OnExit_Implementation()
+void UFFStateBehavior::OnEnter_Implementation(const FFFStateContext& InStateContext)
 {
 }
 
 
-void UFFState::OnUpdate_Implementation(float OneFrame)
+void UFFStateBehavior::OnExit_Implementation(const FFFStateContext& InStateContext)
 {
 }
 
 
-UWorld* UFFState::GetWorld() const
+void UFFStateBehavior::OnUpdate_Implementation(float OneFrame, const FFFStateContext& InStateContext)
+{
+}
+
+
+void UFFStateBehavior::OnHit_Implementation(const FFFStateContext& InStateContext)
+{
+}
+
+
+void UFFStateBehavior::OnBlock_Implementation(const FFFStateContext& InStateContext)
+{
+}
+
+
+void UFFStateBehavior::OnInputEvent_Implementation(const FFFStateContext& InStateContext)
+{
+}
+
+
+UWorld* UFFStateBehavior::GetWorld() const
 {
 	UFFStateMachineComponent* SMC = Cast<UFFStateMachineComponent>(GetOuter());
 	if(SMC)

Source/UnrealFightingFramework/State/FFState.h

@@ -7,25 +7,11 @@
 
 #include "FFState.generated.h"
 
-/**
+USTRUCT(BlueprintType)
- *	A state is an object that provides rules and conditions for when a state can be transitioned into
+struct FFFStateData
- *	and logic to run when the state is entered, exited, and active.
- */
-UCLASS()
-class UNREALFIGHTINGFRAMEWORK_API UFFState : public UObject
 {
     GENERATED_BODY()
 
-public:
-
-	/**
-	 *	Initializes pointers to what owns this state and what avatar this state represents.
-	 *
-	 *  @param InOwner Actor that owns this state machine.
-	 *	@param InAvatar Actor that this state machine represents.
-	 */
-	virtual void InitActorInfo(AActor* InOwner, AActor* InAvatar);
-
     /** Name of this state */
 	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="UFF|State")
 	FName Name;
@@ -38,21 +24,56 @@ public:
 	UPROPERTY(EditAnywhere)
 	uint8 StateType;
 
-	/** How many ticks have elapsed since this state was entered */
+};
-	UPROPERTY(BlueprintReadOnly, Category="UFF|State")
-	int32 TicksInState;
 
+USTRUCT(BlueprintType)
+struct FFFStateContext
+{
+    GENERATED_BODY()
+
+	/** Actor that owns the avatar. Typically a player controller. */
+	AActor* Owner;
+
+	/**
+	 *	Actor that represents the player's avatar or an object associated with the player's avatar.
+	 *	This is typically a character or a weapon.
+	 */
+	AActor* Avatar;
+
+	/**
+	 *	Data associated with this state.
+	 *	For example this can be new movement values or data about the hitboxes if this state represents an attack.
+	 */
+	FFFStateData StateData;
+};
+
+/**
+ *	A state is an object that provides rules and conditions for when a state can be transitioned into
+ *	and logic to run when the state is entered, exited, and active.
+ */
+UCLASS()
+class UNREALFIGHTINGFRAMEWORK_API UFFStateBehavior : public UObject
+{
+	GENERATED_BODY()
+
+public:
+    /** Name of this state behavior */
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="UFF|State")
+	FName Name;
+
+	// TODO: since state's are now purely behavioral can we remove these function calls?
+	// They are basically redundant with OnEnter, OnUpdate, OnExit, etc.
 	/**
 	 *	Called whenever this state is transitioned into.
 	 *
 	 *	Resets TicksInState and calls appropriate Blueprint hooks
 	 */
-	void Enter();
+	void Enter(const FFFStateContext& InStateContext);
 
 	/**
 	 *	Called whenever this state is transitioned out of into a new state.
 	 */
-	void Exit();
+	void Exit(const FFFStateContext& InStateContext);
 
 	/**
 	 *	Called whenever this state is active and the game logic ticks.
@@ -61,19 +82,19 @@ public:
 	 *
 	 *	@param OneFrame the time that elapses during one fixed tick
 	 */
-	void Update(float OneFrame);
+	void Update(float OneFrame, const FFFStateContext& InStateContext);
 
     /**
      *	Blueprint hook that is called whenever this state is transitioned into
      */
 	UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
-	void OnEnter();
+	void OnEnter(const FFFStateContext& InStateContext);
 
 	/**
 	 *	Blueprint hook that is called whenever this state is transitioned out of into a new state
 	 */
 	UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
-	void OnExit();
+	void OnExit(const FFFStateContext& InStateContext);
 
 	/**
 	 *	Blueprint hook that is called whenever this state is active and the game logic ticks
@@ -81,25 +102,21 @@ public:
 	 *	@param OneFrame the time that elapses during one fixed tick
 	 */
 	UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
-	void OnUpdate(float OneFrame);
+	void OnUpdate(float OneFrame, const FFFStateContext& InStateContext);
+
+	UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
+	void OnLanded(const FFFStateContext& InStateContext);
+
+    UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
+	void OnHit(const FFFStateContext& InStateContext);
+
+    UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
+	void OnBlock(const FFFStateContext& InStateContext);
+
+    UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
+	void OnInputEvent(const FFFStateContext& InStateContext);
 
 	// UObject interface
 	virtual UWorld* GetWorld() const override;
 	// End of UObject interface
-
-protected:
-
-	/**
-	 *	Actor that owns this state.
-	 *	This will typically be a player controller that possesses the avatar.
-	 */
-	UPROPERTY(BlueprintReadOnly)
-	AActor* Owner;
-
-	/**
-	 *	The avatar is an actor that this state represents.
-	 *	This will typically be a pawn or character.
-	 */
-	UPROPERTY(BlueprintReadOnly)
-	AActor* Avatar;
 };

Source/UnrealFightingFramework/State/FFStateContextInterface.cpp

@@ -0,0 +1,6 @@
+// Unreal Fighting Framework by Kevin Poretti
+
+
+#include "State/FFStateContextInterface.h"
+
+// Add default functionality here for any IFFStateContextInterface functions that are not pure virtual.

Source/UnrealFightingFramework/State/FFStateContextInterface.h

@@ -0,0 +1,31 @@
+// Unreal Fighting Framework by Kevin Poretti
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "UObject/Interface.h"
+
+#include "FFStateContextInterface.generated.h"
+
+UINTERFACE(MinimalAPI)
+class UFFStateContextInterface : public UInterface
+{
+	GENERATED_BODY()
+};
+
+/**
+ * 
+ */
+class UNREALFIGHTINGFRAMEWORK_API IFFStateContextInterface
+{
+	GENERATED_BODY()
+
+public:
+	virtual bool CheckStateEnabled(uint8 StateType) = 0;
+
+	virtual bool CheckStance(uint8 Stance) = 0;
+
+	virtual bool CheckStateEntryConditions(const TArray<uint8>& EntryConditions) = 0;
+
+	virtual bool CheckInputSequences(const TArray<FFFInputSequence>& InputSequences) = 0;
+};

Source/UnrealFightingFramework/State/FFStateMachineComponent.cpp

@@ -14,13 +14,13 @@ UFFStateMachineComponent::UFFStateMachineComponent()
 
 void UFFStateMachineComponent::Initialize()
 {
-    for(const TSubclassOf<UFFState>& CurrState : DefaultStates)
+    for(const TSubclassOf<UFFStateBehavior>& CurrState : DefaultStates)
     {
-        UFFState* TempState = AddState(CurrState);
+        UFFStateBehavior* TempState = AddState(CurrState);
         if(!CurrentState) // first state to be created is the entry into this state machine
         {
             CurrentState = TempState;
-            CurrentState->Enter();
+            CurrentState->Enter(GetCurrentStateContext());
         }
     }
 }
@@ -33,13 +33,12 @@ void UFFStateMachineComponent::InitActorInfo(AActor* InOwner, AActor* InAvatar)
 }
 
 
-UFFState* UFFStateMachineComponent::AddState(TSubclassOf<UFFState> StateClassToAdd)
+UFFStateBehavior* UFFStateMachineComponent::AddState(TSubclassOf<UFFStateBehavior> StateClassToAdd)
 {
-    UFFState* TempState = NewObject<UFFState>(this, StateClassToAdd);
+    UFFStateBehavior* TempState = NewObject<UFFStateBehavior>(this, StateClassToAdd);
     if(TempState)
     {
         States.Add(TempState);
-        TempState->InitActorInfo(Owner, Avatar);
         return TempState;
     }
 
@@ -47,9 +46,9 @@ UFFState* UFFStateMachineComponent::AddState(TSubclassOf<UFFState> StateClassToA
 }
 
 
-void UFFStateMachineComponent::AddStates(const TArray<TSubclassOf<UFFState>>& StateClassesToAdd)
+void UFFStateMachineComponent::AddStates(const TArray<TSubclassOf<UFFStateBehavior>>& StateClassesToAdd)
 {
-    for(const TSubclassOf<UFFState>& CurrState : StateClassesToAdd)
+    for(const TSubclassOf<UFFStateBehavior>& CurrState : StateClassesToAdd)
     {
         AddState(CurrState);
     }
@@ -61,13 +60,15 @@ void UFFStateMachineComponent::RemoveState(FName StateToRemove)
     UE_LOG(LogTemp, Error, TEXT("UFFStateMachineComponent::RemoveState is not yet implemented"));
 }
 
-void UFFStateMachineComponent::SwitchStates(UFFState* NewState)
+void UFFStateMachineComponent::SwitchStates(UFFStateBehavior* NewState)
 {
     check(NewState);
 
-    CurrentState->Exit();
+
+    CurrentState->Exit(GetCurrentStateContext());
     CurrentState = NewState;
-    CurrentState->Enter();
+    CurrentState->Enter(GetCurrentStateContext());
+    TicksInState = 0;
 }
 
 
@@ -77,9 +78,18 @@ FName UFFStateMachineComponent::GetCurrentStateName() const
 }
 
 
-UFFState* UFFStateMachineComponent::FindStateWithName(FName StateName)
+FFFStateContext UFFStateMachineComponent::GetCurrentStateContext() const
 {
-    for (UFFState* CurrState : States)
+    FFFStateContext CurrStateContext;
+    CurrStateContext.Owner = Owner;
+    CurrStateContext.Avatar = Avatar;
+    return CurrStateContext;
+}
+
+
+UFFStateBehavior* UFFStateMachineComponent::FindStateWithName(FName StateName)
+{
+    for (UFFStateBehavior* CurrState : States)
     {
         if(CurrState->Name == StateName)
         {
@@ -106,7 +116,7 @@ void UFFStateMachineComponent::FixedTick(float OneFrame)
 {
     // Should we switch states?
 
-    for(UFFState* CurrState : States)
+    for(UFFStateBehavior* CurrState : States)
     {
         // Check if the state is enabled
 
@@ -128,7 +138,8 @@ void UFFStateMachineComponent::FixedTick(float OneFrame)
     check(CurrentState);
 
     // Tick current state
-    CurrentState->Update(OneFrame);
+    TicksInState++;
+    CurrentState->Update(OneFrame, GetCurrentStateContext());
 
     // Debug
 }

Source/UnrealFightingFramework/State/FFStateMachineComponent.h

@@ -47,14 +47,14 @@ public:
 	 *
 	 *	@return A pointer to the state that was added or nullptr if there was an issue adding or creating the state
 	 */
-	UFFState* AddState(TSubclassOf<UFFState> StateClassToAdd);
+	UFFStateBehavior* AddState(TSubclassOf<UFFStateBehavior> StateClassToAdd);
 
     /**
 	 *	Creates an instance of the state classes and adds newly created states to this state machine.
 	 *
 	 *	@param StateClassesToAdd Array of state class types to be added to this state machine
 	 */
-	void AddStates(const TArray<TSubclassOf<UFFState>>& StateClassesToAdd);
+	void AddStates(const TArray<TSubclassOf<UFFStateBehavior>>& StateClassesToAdd);
 
     /**
 	 *	Destroys the state with corresponding name and removes it from this state machine.
@@ -66,7 +66,7 @@ public:
 	 *
 	 *	Triggers the Exit callback on the CurrentState and the Enter callback on the new state
 	 */
-	void SwitchStates(UFFState* NewState);
+	void SwitchStates(UFFStateBehavior* NewState);
 
     /**
      *	Returns the name of the current state
@@ -74,6 +74,11 @@ public:
 	UFUNCTION(BlueprintPure)
 	FName GetCurrentStateName() const;
 
+	/**
+	 *
+	 */
+	FFFStateContext GetCurrentStateContext() const;
+
 	// IFFSystemInterface interface
     virtual void FixedTick(float OneFrame) override;
 	// End of IFFSystemInterface interface
@@ -93,24 +98,28 @@ protected:
 	UPROPERTY(BlueprintReadOnly)
 	AActor* Avatar;
 
+    /** How many ticks have elapsed since the currently active state was entered */
+	UPROPERTY(BlueprintReadOnly, Category="UFF|State")
+	int32 TicksInState;
+
 	/**
 	 *	States classes to create and add to this state machine when the game starts
 	 */
 	UPROPERTY(EditDefaultsOnly, Category="UFF|State Machine")
-	TArray<TSubclassOf<UFFState>> DefaultStates;
+	TArray<TSubclassOf<UFFStateBehavior>> DefaultStates;
 
 	/** Current active state for this state machine */
 	UPROPERTY(BlueprintReadOnly)
-	UFFState* CurrentState;
+	UFFStateBehavior* CurrentState;
 
 	// States that have been added
 	UPROPERTY(BlueprintReadOnly)
-	TArray<UFFState*> States;
+	TArray<UFFStateBehavior*> States;
 
     /**
 	 *	Returns the state with corresponding name 
 	 */
-	UFFState* FindStateWithName(FName StateName);
+	UFFStateBehavior* FindStateWithName(FName StateName);
 
 	// UActorComponent interface
 	virtual void BeginPlay() override;