limboai/hsm/limbo_hsm.h

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/**
* limbo_hsm.h
* =============================================================================
* Copyright 2021-2024 Serhii Snitsaruk
*
* Use of this source code is governed by an MIT-style
* license that can be found in the LICENSE file or at
* https://opensource.org/licenses/MIT.
* =============================================================================
*/
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#ifndef LIMBO_HSM_H
#define LIMBO_HSM_H
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#include "limbo_state.h"
#define TransitionKey Pair<uint64_t, StringName>
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class LimboHSM : public LimboState {
GDCLASS(LimboHSM, LimboState);
public:
enum UpdateMode : unsigned int {
IDLE, // automatically call update() during NOTIFICATION_PROCESS
PHYSICS, // automatically call update() during NOTIFICATION_PHYSICS
MANUAL, // manually update state machine: user must call update(delta)
};
private:
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struct TransitionKeyHasher {
static uint32_t hash(const TransitionKey &P) {
uint64_t h1 = HashMapHasherDefault::hash(P.first);
uint64_t h2 = HashMapHasherDefault::hash(P.second);
return hash_one_uint64((h1 << 32) | h2);
}
};
struct Transition {
ObjectID from_state;
ObjectID to_state;
StringName event;
inline bool is_valid() const { return to_state != ObjectID(); }
static _FORCE_INLINE_ TransitionKey make_key(LimboState *p_from_state, const StringName &p_event) {
return TransitionKey(
p_from_state != nullptr ? uint64_t(p_from_state->get_instance_id()) : 0,
p_event);
}
};
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UpdateMode update_mode;
LimboState *initial_state;
LimboState *active_state;
LimboState *previous_active;
LimboState *next_active;
bool updating = false;
bool was_active = false;
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HashMap<TransitionKey, Transition, TransitionKeyHasher> transitions;
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void _get_transition(LimboState *p_from_state, const StringName &p_event, Transition &r_transition) const;
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protected:
static void _bind_methods();
void _notification(int p_what);
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void _validate_property(PropertyInfo &p_property) const;
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virtual void _initialize(Node *p_agent, const Ref<Blackboard> &p_blackboard) override;
virtual bool _dispatch(const StringName &p_event, const Variant &p_cargo = Variant()) override;
virtual void _enter() override;
virtual void _exit() override;
virtual void _update(double p_delta) override;
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public:
void set_update_mode(UpdateMode p_mode) { update_mode = p_mode; }
UpdateMode get_update_mode() const { return update_mode; }
void set_active(bool p_active);
void change_active_state(LimboState *p_state);
LimboState *get_active_state() const { return active_state; }
LimboState *get_previous_active_state() const { return previous_active; }
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LimboState *get_leaf_state() const;
void set_initial_state(LimboState *p_state);
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LimboState *get_initial_state() const { return initial_state; }
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virtual void initialize(Node *p_agent, const Ref<Blackboard> &p_parent_scope = nullptr);
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void update(double p_delta);
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void add_transition(LimboState *p_from_state, LimboState *p_to_state, const StringName &p_event);
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void remove_transition(LimboState *p_from_state, const StringName &p_event);
bool has_transition(LimboState *p_from_state, const StringName &p_event) const { return transitions.has(Transition::make_key(p_from_state, p_event)); }
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LimboState *anystate() const { return nullptr; }
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LimboHSM();
};
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#endif // LIMBO_HSM_H