Add simple player STM

src/assets/animation.hpp

@@ -30,6 +30,7 @@ namespace assets
 
 		size_t GetNumFrames() const { return num_frames_; }
 		float GetTPS() const { return tps_; }
+		float GetDuration() const { return static_cast<float>(num_frames_) / tps_; }
 
 		size_t GetNumChannels() const { return channels_.size(); }
 		const AnimationChannel& GetChannel(int index) const { return channels_[index]; }

src/game/player.cpp

@@ -19,8 +19,6 @@ game::Player::Player(World* world, size_t sector_idx, const glm::vec3& position)
 		world->GetTimePtr()
 	);
 
-	vm_hands_.PlayAnim("knife_idle");
-
 	light_trace_offset_ = glm::vec3(0.0f, 0.0f, 0.6f);
 }
 
@@ -40,6 +38,8 @@ void game::Player::Update(float dt)
 {
 	time_ += dt;
 
+	UpdateState();
+
 	vm_node_.UpdateMatrix();
 	vm_hands_.Update();
 	
@@ -195,3 +195,89 @@ glm::vec2 game::Player::GetBobbingOffset(float t, float amplitude)
 
 	return offset;
 }
+
+
+//// STATE MACHINE
+struct PlayerStateTableEntry
+{
+	void (game::Player::*enter)();
+	int (game::Player::*update)();
+	void (game::Player::*exit)();
+};
+
+void game::Player::UpdateState()
+{
+	static const PlayerStateTableEntry state_table[] =
+	{
+		//	enter							update								exit
+		{	nullptr,						&game::Player::Update_Init,			nullptr }, // PS_INIT
+		{	&game::Player::Enter_Idle,		&game::Player::Update_Idle,			nullptr }, // PS_IDLE
+		{	&game::Player::Enter_Attack,	&game::Player::Update_Attack,		nullptr }, // PS_ATTACK
+	};
+
+	int new_state = -1;
+	do
+	{
+		int new_state = (this->*state_table[state_].update)();
+
+		if (new_state >= 0)
+		{
+			if (auto exit_fun = state_table[state_].exit)
+				(this->*exit_fun)();
+
+			state_ = static_cast<PlayerState>(new_state);
+
+			if (auto enter_fun = state_table[state_].enter)
+				(this->*enter_fun)();
+		}
+	}
+	while (new_state >= 0);
+}
+
+// INIT
+
+int game::Player::Update_Init()
+{
+	return PS_IDLE;
+}
+
+// IDLE
+
+void game::Player::Enter_Idle()
+{
+	vm_hands_.PlayAnim("knife_idle", ANIM_LOOP);
+}
+
+int game::Player::Update_Idle()
+{
+	if (input_ & PI_ATTACK)
+	{
+		return PS_ATTACK;
+	}
+
+	return -1;
+}
+
+// ATTACK
+
+void game::Player::Enter_Attack()
+{
+	if (rand() % 2 == 0)
+	{
+		vm_hands_.PlayAnim("knife_attack1");
+	}
+	else
+	{
+		vm_hands_.PlayAnim("knife_attack2");
+	}
+}
+
+int game::Player::Update_Attack()
+{
+	if (vm_hands_.AnimDone())
+	{
+		return PS_IDLE;
+	}
+
+	return -1;
+}

src/game/player.hpp

@@ -6,6 +6,13 @@
 
 namespace game
 {
+	enum PlayerState
+	{
+		PS_INIT,
+		PS_IDLE,
+		PS_ATTACK,
+	};
+
 	class Player : public Entity
 	{
 		using Super = Entity;
@@ -33,6 +40,8 @@ namespace game
 		MeshInstance vm_hands_;
 		std::unique_ptr<MeshInstance> vm_weapon_; // Can be null
 
+		PlayerState state_ = PS_INIT;
+		
 	public:
 		Player(World* world, size_t sector_idx, const glm::vec3& position);
 
@@ -51,6 +60,21 @@ namespace game
 	private:
 		static glm::vec2 GetBobbingOffset(float t, float amplitude);
 
+		// STATE MACHINE
+
+		void UpdateState();
+
+		//void Enter_Init();
+		int Update_Init();
+		//void Exit_Init();
+
+		void Enter_Idle();
+		int Update_Idle();
+		//void Exit_Idle();
+
+		void Enter_Attack();
+		int Update_Attack();
+		//void Exit_Attack();
 	};