feat: implemented enemy wretched patrol and chase states

modules/wave_survival/enemies/enemy_wretched.cpp

@@ -10,6 +10,8 @@ void EnemyWretched::_bind_methods() {
 void EnemyWretched::ready() {
 	if (StateMachine * fsm{ cast_to<StateMachine>(get_node(NodePath("%StateMachine"))) }) {
 		fsm->add_state(memnew(WretchedPatrolState));
+		fsm->add_state(memnew(WretchedChaseState));
+		fsm->add_state(memnew(WretchedAttackState));
 	}
 }
 
@@ -28,28 +30,69 @@ void EnemyWretched::_notification(int what) {
 
 void WretchedState::set_target(Node *node) {
 	this->target = cast_to<EnemyWretched>(node);
+	this->nav = this->target->get_nav();
+	this->unit = this->target->get_unit();
 }
 
 EnemyWretched *WretchedState::get_target() const {
 	return this->target;
 }
 
+NpcUnit *WretchedState::get_unit() const {
+	return this->unit;
+}
+
+NavigationAgent3D *WretchedState::get_nav() const {
+	return this->nav;
+}
+
 void WretchedPatrolState::enter_state() {
-	this->nav = get_target()->get_nav();
 	this->path = get_target()->get_unit()->get_patrol_path();
 
-	float const max_speed{ get_target()->get_unit()->get_patrol_speed() };
+	float const max_speed{ get_unit()->get_patrol_speed() };
 	get_target()->set_movement_speed(max_speed);
-	this->nav->set_max_speed(max_speed);
+	get_nav()->set_max_speed(max_speed);
 	this->path_point = this->path->get_closest_point(get_target()->get_global_position());
-	this->nav->set_target_position(this->path->point_at(this->path_point));
+	get_nav()->set_target_position(this->path->point_at(this->path_point));
 }
 
 void WretchedPatrolState::process(double delta) {
-	if (this->nav->is_navigation_finished()) {
+	if (get_nav()->is_navigation_finished()) {
 		this->path_point += 1;
-		this->nav->set_target_position(this->path->point_at(this->path_point));
+		get_nav()->set_target_position(this->path->point_at(this->path_point));
 	}
-	Vector3 const direction{ get_target()->get_global_position().direction_to(this->nav->get_next_path_position()) };
+	Vector3 const direction{ get_target()->get_global_position().direction_to(get_nav()->get_next_path_position()) };
 	get_target()->set_movement_direction(Vector2{ direction.x, direction.z }.normalized());
 }
+
+String WretchedPatrolState::get_next_state() const {
+	if (get_target()->get_unit()->is_aware_of_player()) {
+		return WretchedChaseState::get_class_static();
+	}
+	return get_class();
+}
+
+void WretchedChaseState::enter_state() {
+	// TODO: replace this with a setting somewhere
+	get_target()->set_movement_speed(get_unit()->get_patrol_speed() * 2.f);
+	get_nav()->set_max_speed(get_unit()->get_patrol_speed() * 2.f);
+	get_nav()->set_target_position(PlayerBody::get_singleton()->get_global_position());
+}
+
+void WretchedChaseState::process(double delta) {
+	// TODO: optimize this with some checks to avoid re-pathing every frame
+	get_nav()->set_target_position(PlayerBody::get_singleton()->get_global_position());
+	Vector3 const direction{ get_target()->get_global_position().direction_to(get_nav()->get_next_path_position()) };
+	get_target()->set_movement_direction(Vector2{ direction.x, direction.z }.normalized());
+}
+
+String WretchedChaseState::get_next_state() const {
+	if (get_target()->get_global_position().distance_to(PlayerBody::get_singleton()->get_global_position()) < 2.f) {
+		return WretchedAttackState::get_class_static();
+	}
+	return get_class();
+}
+
+String WretchedAttackState::get_next_state() const {
+	return WretchedChaseState::get_class_static();
+}

modules/wave_survival/enemies/enemy_wretched.h

@@ -4,6 +4,7 @@
 #include "wave_survival/enemy_body.h"
 #include "wave_survival/state.h"
 class PatrolPath;
+class NpcUnit;
 
 class EnemyWretched : public EnemyBody {
 	GDCLASS(EnemyWretched, EnemyBody);
@@ -23,9 +24,13 @@ class WretchedState : public State {
 public:
 	virtual void set_target(Node *node) override;
 	EnemyWretched *get_target() const;
+	NpcUnit *get_unit() const;
+	NavigationAgent3D *get_nav() const;
 
 private:
+	NpcUnit *unit{ nullptr };
 	EnemyWretched *target{ nullptr };
+	NavigationAgent3D *nav{ nullptr };
 };
 
 class WretchedPatrolState : public WretchedState {
@@ -35,11 +40,29 @@ class WretchedPatrolState : public WretchedState {
 public:
 	virtual void enter_state() override;
 	virtual void process(double delta) override;
+	virtual String get_next_state() const override;
 
 private:
-	NavigationAgent3D *nav{ nullptr };
 	int path_point{ 0 };
 	PatrolPath *path{ nullptr };
 };
 
+class WretchedChaseState : public WretchedState {
+	GDCLASS(WretchedChaseState, WretchedState);
+	static void _bind_methods() {}
+
+public:
+	virtual void enter_state() override;
+	virtual void process(double delta) override;
+	virtual String get_next_state() const override;
+};
+
+class WretchedAttackState : public WretchedState {
+	GDCLASS(WretchedAttackState, WretchedState);
+	static void _bind_methods() {}
+
+public:
+	virtual String get_next_state() const override;
+};
+
 #endif // !ENEMY_WRETCHED_H

modules/wave_survival/npc_unit.cpp

@@ -2,15 +2,24 @@
 #include "enemy_body.h"
 #include "macros.h"
 #include "patrol_path.h"
+#include "player_detector.h"
 
 void NpcUnit::_bind_methods() {
 	BIND_HPROPERTY(Variant::OBJECT, patrol_path, PROPERTY_HINT_NODE_TYPE, "PatrolPath");
 }
 
+void NpcUnit::on_npc_awareness_changed(bool value) {
+	if (value) {
+		this->aware_of_player = true;
+	}
+}
+
 void NpcUnit::child_added(Node *node) {
 	if (EnemyBody * npc{ cast_to<EnemyBody>(node) }) {
 		this->npcs.push_back(npc);
 		npc->set_unit(this);
+		PlayerDetector *detector{ cast_to<PlayerDetector>(npc->get_node(NodePath("%PlayerDetector"))) };
+		detector->connect(PlayerDetector::sig_awareness_changed, callable_mp(this, &self_type::on_npc_awareness_changed));
 	}
 }
 
@@ -40,7 +49,7 @@ PatrolPath *NpcUnit::get_patrol_path() const {
 }
 
 bool NpcUnit::is_aware_of_player() const {
-	return false;
+	return this->aware_of_player;
 }
 
 void NpcUnit::set_patrol_speed(float speed) {

modules/wave_survival/npc_unit.h

@@ -9,6 +9,7 @@ class PatrolPath;
 class NpcUnit : public Node {
 	GDCLASS(NpcUnit, Node);
 	static void _bind_methods();
+	void on_npc_awareness_changed(bool seen);
 	void child_added(Node *node);
 	void enter_tree();
 
@@ -23,6 +24,7 @@ public:
 	float get_patrol_speed() const;
 
 private:
+	bool aware_of_player{ false };
 	Vector<EnemyBody *> npcs{};
 	PatrolPath *patrol_path{ nullptr };
 	float patrol_speed{ 3.f };

modules/wave_survival/player_detector.cpp

@@ -0,0 +1,74 @@
+#include "player_detector.h"
+
+String PlayerDetector::sig_awareness_changed{ "awareness_changed" };
+
+void PlayerDetector::_bind_methods() {
+	ADD_SIGNAL(MethodInfo(sig_awareness_changed, PropertyInfo(Variant::BOOL, "aware")));
+}
+
+// Check if the player is in a bounded area in front of the detector and unobscured.
+// As all tests are required to pass, we do them in increasing order of complexity, to minimize unneeded resource use.
+bool PlayerDetector::check() const {
+	Vector3 const forward{ get_global_basis().get_column(2) };
+	Vector3 const position{ get_global_position() };
+	Vector3 const target{ PlayerBody::get_singleton()->get_global_position() + Vector3{ 0.f, 1.5f, 0.f } };
+	// check if the target is in a view cone
+	if (forward.dot(target - position) < this->min_dot) {
+		return false;
+	}
+	// check if the target is in range
+	if (position.distance_squared_to(target) > this->max_distance * this->max_distance) {
+		return false;
+	}
+	// check if the target is obscured
+	PhysicsDirectSpaceState3D::RayParameters params{ this->ray_params };
+	params.from = position;
+	params.to = target;
+	PhysicsDirectSpaceState3D *space{ get_world_3d()->get_direct_space_state() };
+	PhysicsDirectSpaceState3D::RayResult result{};
+	space->intersect_ray(params, result);
+	return result.collider == nullptr;
+}
+
+void PlayerDetector::ready() {
+	this->ray_params.exclude.insert(PlayerBody::get_singleton()->get_rid());
+}
+
+void PlayerDetector::process(double delta) {
+	if (this->query_timer > 0.0) {
+		this->query_timer -= delta;
+	} else {
+		this->query_timer = this->query_time;
+		bool const new_awareness{ check() };
+		if (new_awareness != this->aware_of_player) {
+			set_aware_of_player(new_awareness);
+		}
+	}
+}
+
+void PlayerDetector::set_aware_of_player(bool value) {
+	print_line(vformat("awareness changed to %s", value));
+	emit_signal(sig_awareness_changed, value);
+	this->aware_of_player = value;
+}
+
+void PlayerDetector::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			set_process(true);
+			ready();
+			return;
+		case NOTIFICATION_PROCESS:
+			process(get_process_delta_time());
+			return;
+	}
+}
+
+bool PlayerDetector::is_aware_of_player() const {
+	return this->aware_of_player;
+}

modules/wave_survival/player_detector.h

@@ -0,0 +1,33 @@
+#ifndef PLAYER_DETECTOR_H
+#define PLAYER_DETECTOR_H
+
+#include "player_body.h"
+#include "scene/3d/node_3d.h"
+
+class PlayerDetector : public Node3D {
+	GDCLASS(PlayerDetector, Node3D);
+	static void _bind_methods();
+	bool check() const;
+	void ready();
+	void process(double delta);
+	void set_aware_of_player(bool value);
+
+protected:
+	void _notification(int what);
+
+public:
+	bool is_aware_of_player() const;
+
+private:
+	bool aware_of_player{ false };
+	float max_distance{ 100.f };
+	float min_dot{ 0.1f };
+	double query_time{ 0.3 };
+	double query_timer{ 0.0 };
+	PhysicsDirectSpaceState3D::RayParameters ray_params{};
+
+public:
+	static String sig_awareness_changed;
+};
+
+#endif // !PLAYER_DETECTOR_H

modules/wave_survival/register_types.cpp

@@ -9,6 +9,7 @@
 #include "wave_survival/patrol_path.h"
 #include "wave_survival/player_body.h"
 #include "wave_survival/player_camera.h"
+#include "wave_survival/player_detector.h"
 #include "wave_survival/player_input.h"
 #include "wave_survival/state.h"
 #include "wave_survival/state_machine.h"
@@ -34,6 +35,10 @@ void initialize_wave_survival_module(ModuleInitializationLevel p_level) {
 	GDREGISTER_CLASS(PatrolPath);
 	GDREGISTER_CLASS(NpcUnit);
 	GDREGISTER_CLASS(EnemyWretched);
+	GDREGISTER_CLASS(WretchedPatrolState);
+	GDREGISTER_CLASS(WretchedChaseState);
+	GDREGISTER_CLASS(WretchedAttackState);
+	GDREGISTER_CLASS(PlayerDetector);
 }
 
 void uninitialize_wave_survival_module(ModuleInitializationLevel p_level) {

modules/wave_survival/state_machine.cpp

@@ -15,15 +15,12 @@ void StateMachine::switch_to_state(State *state) {
 	}
 }
 
-void StateMachine::ready() {
-}
-
 void StateMachine::process(double delta) {
 	if (this->current_state) {
 		this->current_state->process(delta);
 		String new_state{ this->current_state->get_next_state() };
 		if (new_state != this->current_state->get_class()) {
-			this->switch_to_state(this->states[new_state]);
+			this->switch_to_state(this->states.has(new_state) ? this->states[new_state] : nullptr);
 		}
 	}
 }
@@ -37,7 +34,6 @@ void StateMachine::_notification(int what) {
 			return;
 		case NOTIFICATION_READY:
 			set_process(true);
-			ready();
 			return;
 		case NOTIFICATION_PROCESS:
 			process(get_process_delta_time());
@@ -47,7 +43,9 @@ void StateMachine::_notification(int what) {
 
 StateMachine::~StateMachine() {
 	for (KeyValue<StringName, State *> kvp : this->states) {
-		memdelete(kvp.value);
+		if (kvp.value != nullptr) {
+			memdelete(kvp.value);
+		}
 	}
 }
 
@@ -58,4 +56,8 @@ void StateMachine::add_state(State *state) {
 	if (this->current_state == nullptr) {
 		this->switch_to_state(state);
 	}
+	print_line("states:");
+	for (KeyValue<StringName, State *> kv : this->states) {
+		print_line(vformat("\t\t| %s %s", kv.key, kv.value));
+	}
 }

modules/wave_survival/state_machine.h

@@ -8,7 +8,6 @@ class StateMachine : public Node {
 	GDCLASS(StateMachine, Node);
 	static void _bind_methods();
 	void switch_to_state(State *state);
-	void ready();
 	void process(double delta);
 
 protected:

project/maps/testmap.tscn

@@ -29,6 +29,8 @@ navigation_mesh = SubResource("NavigationMesh_7ng1a")
 
 [node name="CSGCombiner3D" type="CSGCombiner3D" parent="NavigationRegion3D"]
 use_collision = true
+collision_layer = 3
+collision_mask = 0
 
 [node name="CSGBox3D2" type="CSGBox3D" parent="NavigationRegion3D/CSGCombiner3D"]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -7.424776, 3.1962457, -1.9109192)
@@ -399,7 +401,16 @@ slide_on_ceiling = false
 patrol_path = NodePath("../PatrolPath")
 
 [node name="EnemyWretched" parent="NpcUnit" instance=ExtResource("3_7ng1a")]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0.017590523, 0.023196908, 3.073964)
+transform = Transform3D(-1, 0, -8.742278e-08, 0, 1, 0, 8.742278e-08, 0, -1, 0.017590523, 0.023196908, 3.073964)
+
+[node name="EnemyWretched2" parent="NpcUnit" instance=ExtResource("3_7ng1a")]
+transform = Transform3D(-1, 0, -8.742278e-08, 0, 1, 0, 8.742278e-08, 0, -1, -1.0904664, 0.023196908, 1.6584808)
+
+[node name="EnemyWretched3" parent="NpcUnit" instance=ExtResource("3_7ng1a")]
+transform = Transform3D(-1, 0, -8.742278e-08, 0, 1, 0, 8.742278e-08, 0, -1, 1.1613213, 0.023196908, 1.513694)
+
+[node name="EnemyWretched4" parent="NpcUnit" instance=ExtResource("3_7ng1a")]
+transform = Transform3D(-1, 0, -8.742278e-08, 0, 1, 0, 8.742278e-08, 0, -1, -0.977286, 0.023196908, 4.202239)
 
 [node name="PatrolPath" type="PatrolPath" parent="."]
 

project/objects/enemies/enemy_wretched.tscn

@@ -19,3 +19,7 @@ unique_name_in_owner = true
 unique_name_in_owner = true
 path_desired_distance = 0.25
 debug_enabled = true
+
+[node name="PlayerDetector" type="PlayerDetector" parent="."]
+unique_name_in_owner = true
+transform = Transform3D(-1, 0, -8.742278e-08, 0, 1, 0, 8.742278e-08, 0, -1, 0, 1.4599279, 0)

project/project.godot

@@ -72,3 +72,5 @@ switch_weapon={
 
 3d_render/layer_1="Default"
 3d_render/layer_2="FirstPerson"
+3d_physics/layer_1="Movement"
+3d_physics/layer_2="Hit"