feat: added sound events for enemy awareness

modules/wave_survival/sound_event_patchboard.cpp

@@ -0,0 +1,27 @@
+#include "sound_event_patchboard.h"
+
+SoundEventPatchboard *SoundEventPatchboard::singleton_instance{ nullptr };
+String const SoundEventPatchboard::sig_sound_triggered{ "sound_triggered" };
+
+void SoundEventPatchboard::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("trigger_sound", "at", "range"), &self_type::trigger_sound);
+	ADD_SIGNAL(MethodInfo(sig_sound_triggered, PropertyInfo(Variant::VECTOR3, "at"), PropertyInfo(Variant::FLOAT, "range")));
+}
+
+SoundEventPatchboard::SoundEventPatchboard() {
+	singleton_instance = this;
+}
+
+SoundEventPatchboard::~SoundEventPatchboard() {
+	if (singleton_instance == this) {
+		singleton_instance = nullptr;
+	}
+}
+
+SoundEventPatchboard *SoundEventPatchboard::get_singleton() {
+	return singleton_instance;
+}
+
+void SoundEventPatchboard::trigger_sound(Vector3 at, float range) {
+	emit_signal(sig_sound_triggered, at, range);
+}