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