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Implement rest of state class and do transition logic in state machine

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This commit is contained in:
Kevin Poretti 2023-07-16 17:09:31 -04:00
parent 4cf3834b2d
commit d7245957df
11 changed files with 299 additions and 135 deletions
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4
Source/UnrealFightingFramework/IFFSystemInterface.cpp
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@ -1,4 +0,0 @@
// Unreal Fighting Framework by Kevin Poretti
#include "IFFSystemInterface.h"

13
Source/UnrealFightingFramework/Input/FFPlayerController.cpp
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@ -33,6 +33,19 @@ void AFFPlayerController::FixedTick(float OneFrame)
}
bool AFFPlayerController::CheckInputSequences(const TArray<FFFInputSequence>& InputSequences)
{
for(const FFFInputSequence& ThisInputSequence : InputSequences)
{
if(InputBuffer->CheckInputSequence(ThisInputSequence))
{
return true;
}
}
return false;
}
void AFFPlayerController::SetupInputComponent()
{
Super::SetupInputComponent();

7
Source/UnrealFightingFramework/Input/FFPlayerController.h
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@ -6,6 +6,7 @@
#include "FFInputBufferComponent.h"
#include "IFFSystemInterface.h"
#include "Utils/TCircleBuffer.h"
#include "State/IFFStateOwnerInterface.h"
// UE includes
#include "CoreMinimal.h"
@ -19,7 +20,7 @@
* unacknowledged inputs to a remote client or server for processing.
*/
UCLASS()
class UNREALFIGHTINGFRAMEWORK_API AFFPlayerController : public APlayerController, public IFFSystemInterface
class UNREALFIGHTINGFRAMEWORK_API AFFPlayerController : public APlayerController, public IFFSystemInterface, public IFFStateOwnerInterface
{
GENERATED_BODY()
@ -50,6 +51,10 @@ public:
virtual void FixedTick(float OneFrame) override;
// End of IFFSystemInterface
// IFFStateOwnerInterface
virtual bool CheckInputSequences(const TArray<FFFInputSequence>& InputSequences) override;
// End of IFFStateOwnerInterface
// APlayerController interface
virtual void SetupInputComponent() override;
// End of APlayerController interface

98
Source/UnrealFightingFramework/State/FFState.cpp
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@ -4,61 +4,97 @@
// FF includes
#include "FFStateMachineComponent.h"
#include "IFFStateAvatarInterface.h"
#include "IFFStateOwnerInterface.h"
// UE includes
#include "Components/SkeletalMeshComponent.h"
void UFFStateBehavior::Enter(const FFFStateContext& InStateContext)
void UFFState::Enter(const FFFStateContext& InStateContext)
{
if(InStateContext.Avatar)
{
USkeletalMeshComponent* SMC = InStateContext.Avatar->GetComponentByClass<USkeletalMeshComponent>();
if(SMC && MontageToPlay)
{
SMC->GetAnimInstance()->Montage_Play(MontageToPlay);
}
}
OnEnter(InStateContext);
}
void UFFStateBehavior::Exit(const FFFStateContext& InStateContext)
void UFFState::Exit(const FFFStateContext& InStateContext)
{
if(InStateContext.Avatar)
{
USkeletalMeshComponent* SMC = InStateContext.Avatar->GetComponentByClass<USkeletalMeshComponent>();
if(SMC && MontageToPlay)
{
FAlphaBlendArgs BlendOutArgs = MontageToPlay->GetBlendOutArgs();
SMC->GetAnimInstance()->Montage_Stop(BlendOutArgs.BlendTime, MontageToPlay);
}
}
OnExit(InStateContext);
}
void UFFStateBehavior::Update(float OneFrame, const FFFStateContext& InStateContext)
void UFFState::Update(float OneFrame, const FFFStateContext& InStateContext)
{
OnUpdate(OneFrame, InStateContext);
}
void UFFStateBehavior::OnLanded_Implementation(const FFFStateContext& InStateContext)
bool UFFState::CanTransition_Implementation(const FFFStateContext& InStateContext)
{
/**
* Check to see if avatar implements StateAvatarInterface
* if so then
* Check if the avatar is in the correct stance to perform this action
* Check if the state is enabled
* Check that all state entry conditions are met if there are any
*
* Check to see if the owner implements the StateOwnerInterface
* Check input conditions if there are any
*
* If all state entry conditions are good and at least one input condition is good then we can transition
* so return true otherwise return false
*/
IFFStateAvatarInterface* SAI = Cast<IFFStateAvatarInterface>(InStateContext.Avatar);
if(SAI)
{
if(!(SAI->CheckStance(StanceRequired) && SAI->CheckStateEnabled(StateType) && SAI->CheckStateEntryConditions(EntryConditions)))
{
return false;
}
}
IFFStateOwnerInterface* SOI = Cast<IFFStateOwnerInterface>(InStateContext.Owner);
if(SOI)
{
if(!SOI->CheckInputSequences(InputSequences))
{
return false;
}
}
return true;
}
void UFFStateBehavior::OnEnter_Implementation(const FFFStateContext& InStateContext)
void UFFState::GotoSubState(FName InSubStateLabel)
{
UFFStateMachineComponent* SMC = Cast<UFFStateMachineComponent>(GetOuter());
if(SMC)
{
SMC->SetSubStateLabel(InSubStateLabel);
}
}
void UFFStateBehavior::OnExit_Implementation(const FFFStateContext& InStateContext)
{
}
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
UWorld* UFFState::GetWorld() const
{
UFFStateMachineComponent* SMC = Cast<UFFStateMachineComponent>(GetOuter());
if(SMC)

131
Source/UnrealFightingFramework/State/FFState.h
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@ -2,29 +2,14 @@
#pragma once
// FF includes
#include "Input/FFInputBufferComponent.h"
// UE includes
#include "CoreMinimal.h"
#include "FFState.generated.h"
USTRUCT(BlueprintType)
struct FFFStateData
{
GENERATED_BODY()
/** Name of this state */
UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="UFF|State")
FName Name;
/** Conditions that need to be met in order for this state to be transitioned into */
UPROPERTY(EditAnywhere)
TArray<uint8> EntryConditions;
/** What is this state's category. Used for determining what types of state can prematurely cancel this one. */
UPROPERTY(EditAnywhere)
uint8 StateType;
};
USTRUCT(BlueprintType)
struct FFFStateContext
@ -41,10 +26,12 @@ struct FFFStateContext
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.
* Parent state machine that controls this state
*/
FFFStateData StateData;
const class UFFStateMachineComponent* Parent;
/** The number of ticks that have elapsed since this state was entered into */
int64 TicksInState;
};
/**
@ -52,68 +39,132 @@ struct FFFStateContext
* and logic to run when the state is entered, exited, and active.
*/
UCLASS()
class UNREALFIGHTINGFRAMEWORK_API UFFStateBehavior : public UObject
class UNREALFIGHTINGFRAMEWORK_API UFFState : public UObject
{
GENERATED_BODY()
public:
// State parameters (should be read-only)
/** Name of this state behavior */
UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="UFF|State")
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="UFF State Properties")
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.
/**
* How long this state will be active before finishing if this state is not cancelled out of
* by other means.
*/
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="UFF State Properties")
int64 StateDuration;
/**
* What stance the object this state represents must be in.
* For example this is usually an enumerated value that signifies if a character needs to be
* crouching, standing, or airborne for this state to be eligible for transitioning.
*/
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="UFF State Properties")
uint8 StanceRequired;
/**
* What is this state's category.
* Used for determining what types of state can prematurely cancel this one.
*/
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="UFF State Properties")
uint8 StateType;
/** Conditions that need to be met in order for this state to be transitioned into */
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="UFF State Properties")
TArray<uint8> EntryConditions;
/**
* Input sequences that needs to be present in the controlling player's input buffer for this
* state to be eligible for transitioning.
*/
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="UFF State Properties")
TArray<FFFInputSequence> InputSequences;
/**
* If true the state can transition from itself into itself without having to go through
* another state like Idle
*/
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="UFF State Properties")
bool bCanTransitionToSelf = false;
/**
* Animation to begin playing when this state is entered
*/
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="UFF State Properties")
UAnimMontage* MontageToPlay;
/**
* Returns true if Avatar's is in the correct stance AND
* the state type is enabled (or the state can be hit or whiff cancelled from the current state) AND
* all state entry conditions were met AND
* at least one input sequence is present in the Owner's input buffer
*/
UFUNCTION(BlueprintNativeEvent, Category="UFF|State")
bool CanTransition(const FFFStateContext& InStateContext);
/**
* Sets the current SubState label on the state machine that controls this
*/
UFUNCTION(BlueprintCallable, Category="UFF|State")
void GotoSubState(FName InSubStateLabel);
/**
* Called whenever this state is transitioned into.
*
* Resets TicksInState and calls appropriate Blueprint hooks
* Calls appropriate Blueprint hooks.
*/
void Enter(const FFFStateContext& InStateContext);
virtual void Enter(const FFFStateContext& InStateContext);
/**
* Called whenever this state is transitioned out of into a new state.
*
* Calls appropriate Blueprint hooks.
*/
void Exit(const FFFStateContext& InStateContext);
virtual void Exit(const FFFStateContext& InStateContext);
/**
* Called whenever this state is active and the game logic ticks.
*
* Increments TicksInState and calls appropriate Blueprint hooks.
* Calls appropriate Blueprint hooks.
*
* @param OneFrame the time that elapses during one fixed tick
*/
void Update(float OneFrame, const FFFStateContext& InStateContext);
virtual void Update(float OneFrame, const FFFStateContext& InStateContext);
/**
* Blueprint hook that is called whenever this state is transitioned into
* Blueprint hook for whenever this state is transitioned into
*/
UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
UFUNCTION(BlueprintImplementableEvent, Category="UFF|State|Events")
void OnEnter(const FFFStateContext& InStateContext);
/**
* Blueprint hook that is called whenever this state is transitioned out of into a new state
* Blueprint hook for whenever this state is transitioned out of into a new state
*/
UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
UFUNCTION(BlueprintImplementableEvent, Category="UFF|State|Events")
void OnExit(const FFFStateContext& InStateContext);
/**
* Blueprint hook that is called whenever this state is active and the game logic ticks
* Blueprint hook for whenever this state is active and the game logic ticks.
*
* @param OneFrame the time that elapses during one fixed tick
*/
UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
UFUNCTION(BlueprintImplementableEvent, Category="UFF|State|Events")
void OnUpdate(float OneFrame, const FFFStateContext& InStateContext);
UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
UFUNCTION(BlueprintImplementableEvent, Category="UFF|State|Events")
void OnLanded(const FFFStateContext& InStateContext);
UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
UFUNCTION(BlueprintImplementableEvent, Category="UFF|State|Events")
void OnHit(const FFFStateContext& InStateContext);
UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
UFUNCTION(BlueprintImplementableEvent, Category="UFF|State|Events")
void OnBlock(const FFFStateContext& InStateContext);
UFUNCTION(BlueprintNativeEvent, Category="UFF|State|Events")
UFUNCTION(BlueprintImplementableEvent, Category="UFF|State|Events")
void OnInputEvent(const FFFStateContext& InStateContext);
// UObject interface

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

25
Source/UnrealFightingFramework/State/FFStateData.h Normal file
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@ -0,0 +1,25 @@
// Unreal Fighting Framework by Kevin Poretti
#pragma once
// FF includes
#include "State/FFState.h"
// UE includes
#include "CoreMinimal.h"
#include "Engine/DataAsset.h"
#include "FFStateData.generated.h"
/**
*
*/
UCLASS()
class UNREALFIGHTINGFRAMEWORK_API UFFStateData : public UDataAsset
{
GENERATED_BODY()
public:
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly)
TArray<TSubclassOf<UFFState>> States;
};

74
Source/UnrealFightingFramework/State/FFStateMachineComponent.cpp
View File

@ -14,9 +14,9 @@ UFFStateMachineComponent::UFFStateMachineComponent()
void UFFStateMachineComponent::Initialize()
{
for(const TSubclassOf<UFFStateBehavior>& CurrState : DefaultStates)
for(const TSubclassOf<UFFState>& CurrState : DefaultStates)
{
UFFStateBehavior* TempState = AddState(CurrState);
UFFState* TempState = AddState(CurrState);
if(!CurrentState) // first state to be created is the entry into this state machine
{
CurrentState = TempState;
@ -33,9 +33,9 @@ void UFFStateMachineComponent::InitActorInfo(AActor* InOwner, AActor* InAvatar)
}
UFFStateBehavior* UFFStateMachineComponent::AddState(TSubclassOf<UFFStateBehavior> StateClassToAdd)
UFFState* UFFStateMachineComponent::AddState(TSubclassOf<UFFState> StateClassToAdd)
{
UFFStateBehavior* TempState = NewObject<UFFStateBehavior>(this, StateClassToAdd);
UFFState* TempState = NewObject<UFFState>(this, StateClassToAdd);
if(TempState)
{
States.Add(TempState);
@ -46,9 +46,9 @@ UFFStateBehavior* UFFStateMachineComponent::AddState(TSubclassOf<UFFStateBehavio
}
void UFFStateMachineComponent::AddStates(const TArray<TSubclassOf<UFFStateBehavior>>& StateClassesToAdd)
void UFFStateMachineComponent::AddStates(const TArray<TSubclassOf<UFFState>>& StateClassesToAdd)
{
for(const TSubclassOf<UFFStateBehavior>& CurrState : StateClassesToAdd)
for(const TSubclassOf<UFFState>& CurrState : StateClassesToAdd)
{
AddState(CurrState);
}
@ -60,21 +60,24 @@ void UFFStateMachineComponent::RemoveState(FName StateToRemove)
UE_LOG(LogTemp, Error, TEXT("UFFStateMachineComponent::RemoveState is not yet implemented"));
}
void UFFStateMachineComponent::SwitchStates(UFFStateBehavior* NewState)
void UFFStateMachineComponent::SwitchStates(UFFState* NewState)
{
check(CurrentState);
check(NewState);
CurrentState->Exit(GetCurrentStateContext());
CurrentState = NewState;
CurrentState->Enter(GetCurrentStateContext());
TicksInState = 0;
CurrentSubStateLabel = NAME_None;
}
FName UFFStateMachineComponent::GetCurrentStateName() const
{
return CurrentState ? CurrentState->Name : NAME_None;
check(CurrentState)
return CurrentState->Name;
}
@ -83,13 +86,21 @@ FFFStateContext UFFStateMachineComponent::GetCurrentStateContext() const
FFFStateContext CurrStateContext;
CurrStateContext.Owner = Owner;
CurrStateContext.Avatar = Avatar;
CurrStateContext.Parent = this;
CurrStateContext.TicksInState = TicksInState;
return CurrStateContext;
}
UFFStateBehavior* UFFStateMachineComponent::FindStateWithName(FName StateName)
void UFFStateMachineComponent::SetSubStateLabel(FName InSubStateLabel)
{
for (UFFStateBehavior* CurrState : States)
CurrentSubStateLabel = InSubStateLabel;
}
UFFState* UFFStateMachineComponent::FindStateWithName(FName StateName)
{
for (UFFState* CurrState : States)
{
if(CurrState->Name == StateName)
{
@ -114,32 +125,35 @@ void UFFStateMachineComponent::BeginPlay()
void UFFStateMachineComponent::FixedTick(float OneFrame)
{
// Should we switch states?
for(UFFStateBehavior* CurrState : States)
{
// Check if the state is enabled
// Check state entry conditions if there are any
// Check input conditions if there are any
// If all state entry conditions are good and at least one input condition is good then we can transition
// Lastly just check if the state we're about to transition into isn't the current state.
// It is OK to transition if state's "CanTransitionToSelf" is true
// SwitchStates(NewState);
// return;
}
// CurrentState should never be null
// TODO: Should probably assert or whatever UE's equivalent is
check(CurrentState);
// Should we switch states?
UFFState* StateToTransitionTo = nullptr;
for(UFFState* ThisState : States)
{
// found a state
if(ThisState->CanTransition(GetCurrentStateContext()))
{
StateToTransitionTo = ThisState;
break;
}
}
// Lastly just check if the state we're about to transition into isn't the current state.
// It is OK to transition if state's "CanTransitionToSelf" is true
if(StateToTransitionTo &&
(CurrentState->Name != StateToTransitionTo->Name || StateToTransitionTo->bCanTransitionToSelf))
{
SwitchStates(StateToTransitionTo);
}
else
{
// Tick current state
TicksInState++;
CurrentState->Update(OneFrame, GetCurrentStateContext());
}
// Debug
}

25
Source/UnrealFightingFramework/State/FFStateMachineComponent.h
View File

@ -3,7 +3,8 @@
#pragma once
// FF includes
#include "UnrealFightingFramework/IFFSystemInterface.h"
#include "IFFSystemInterface.h"
#include "FFState.h"
// UE includes
#include "CoreMinimal.h"
@ -47,14 +48,14 @@ public:
*
* @return A pointer to the state that was added or nullptr if there was an issue adding or creating the state
*/
UFFStateBehavior* AddState(TSubclassOf<UFFStateBehavior> StateClassToAdd);
UFFState* AddState(TSubclassOf<UFFState> 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<UFFStateBehavior>>& StateClassesToAdd);
void AddStates(const TArray<TSubclassOf<UFFState>>& StateClassesToAdd);
/**
* Destroys the state with corresponding name and removes it from this state machine.
@ -66,7 +67,7 @@ public:
*
* Triggers the Exit callback on the CurrentState and the Enter callback on the new state
*/
void SwitchStates(UFFStateBehavior* NewState);
void SwitchStates(UFFState* NewState);
/**
* Returns the name of the current state
@ -79,6 +80,8 @@ public:
*/
FFFStateContext GetCurrentStateContext() const;
void SetSubStateLabel(FName InSubStateLabel);
// IFFSystemInterface interface
virtual void FixedTick(float OneFrame) override;
// End of IFFSystemInterface interface
@ -100,26 +103,30 @@ protected:
/** How many ticks have elapsed since the currently active state was entered */
UPROPERTY(BlueprintReadOnly, Category="UFF|State")
int32 TicksInState;
int64 TicksInState;
/**
* States classes to create and add to this state machine when the game starts
*/
UPROPERTY(EditDefaultsOnly, Category="UFF|State Machine")
TArray<TSubclassOf<UFFStateBehavior>> DefaultStates;
TArray<TSubclassOf<UFFState>> DefaultStates;
/** Current active state for this state machine */
UPROPERTY(BlueprintReadOnly)
UFFStateBehavior* CurrentState;
UFFState* CurrentState;
/** Current SubState label or NAME_None if there is no SubState label set for the current state*/
UPROPERTY(BlueprintReadOnly)
FName CurrentSubStateLabel;
// States that have been added
UPROPERTY(BlueprintReadOnly)
TArray<UFFStateBehavior*> States;
TArray<UFFState*> States;
/**
* Returns the state with corresponding name
*/
UFFStateBehavior* FindStateWithName(FName StateName);
UFFState* FindStateWithName(FName StateName);
// UActorComponent interface
virtual void BeginPlay() override;

12
Source/UnrealFightingFramework/State/FFStateContextInterface.h → Source/UnrealFightingFramework/State/IFFStateAvatarInterface.h
View File

@ -5,10 +5,10 @@
#include "CoreMinimal.h"
#include "UObject/Interface.h"
#include "FFStateContextInterface.generated.h"
#include "IFFStateAvatarInterface.generated.h"
UINTERFACE(MinimalAPI)
class UFFStateContextInterface : public UInterface
class UFFStateAvatarInterface : public UInterface
{
GENERATED_BODY()
};
@ -16,16 +16,14 @@ class UFFStateContextInterface : public UInterface
/**
*
*/
class UNREALFIGHTINGFRAMEWORK_API IFFStateContextInterface
class UNREALFIGHTINGFRAMEWORK_API IFFStateAvatarInterface
{
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 CheckStateEnabled(uint8 StateType) = 0;
virtual bool CheckInputSequences(const TArray<FFFInputSequence>& InputSequences) = 0;
virtual bool CheckStateEntryConditions(const TArray<uint8>& EntryConditions) = 0;
};

25
Source/UnrealFightingFramework/State/IFFStateOwnerInterface.h Normal file
View File

@ -0,0 +1,25 @@
// Unreal Fighting Framework by Kevin Poretti
#pragma once
#include "CoreMinimal.h"
#include "UObject/Interface.h"
#include "IFFStateOwnerInterface.generated.h"
UINTERFACE(MinimalAPI)
class UFFStateOwnerInterface : public UInterface
{
GENERATED_BODY()
};
/**
*
*/
class UNREALFIGHTINGFRAMEWORK_API IFFStateOwnerInterface
{
GENERATED_BODY()
public:
virtual bool CheckInputSequences(const TArray<FFFInputSequence>& InputSequences) = 0;
};