trenches/src/player.cpp

#include "player.hpp"
#include "utils/godot_macros.hpp"
#include <godot_cpp/variant/utility_functions.hpp>
#include <godot_cpp/classes/input_event_joypad_motion.hpp>

void Player::_bind_methods() {
#define CLASSNAME Player
    GDFUNCTION(get_input_directions);
    GDFUNCTION(get_input_fire);
}

void Player::_ready() {
    if(gd::Engine::get_singleton()->is_editor_hint())
        return;
    this->anim_tree = this->get_node<gd::AnimationTree>("%AnimationTree");
    this->fsm = gd::Object::cast_to<gd::AnimationNodeStateMachinePlayback>(this->anim_tree->get("parameters/Actions/playback"));
    this->input = this->get_node<utils::PlayerInput>("%PlayerInput");
    this->input->listen_to(utils::PlayerInput::Listener("dir_left", "dir_right", callable_mp(this, &Player::_on_dir_horizontal)));
    this->input->listen_to(utils::PlayerInput::Listener("dir_backward", "dir_forward", callable_mp(this, &Player::_on_dir_vertical)));
    this->input->listen_to(utils::PlayerInput::Listener("fire", callable_mp(this, &Player::_on_fire)));
    this->model_node = this->get_node<gd::Node3D>("%CharacterModel");
    this->camera_parent = this->get_node<gd::Node3D>("%CameraParent");
    this->camera_parent->set_global_rotation(this->get_global_rotation());
}

void Player::_process(double delta) {
    if(gd::Engine::get_singleton()->is_editor_hint())
        return;
    if(this->input_fire >= 0.0)
        this->input_fire -= delta;
    this->process_rotate(delta);
    this->process_transform_camera(delta);
}

void Player::_physics_process(double delta [[maybe_unused]]) {
    if(gd::Engine::get_singleton()->is_editor_hint())
        return;
    gd::Basis const &model_basis{this->model_node->get_global_basis()};
    gd::Vector3 const local_motion{this->anim_tree->get_root_motion_position()};
    gd::Vector3 const motion {
        local_motion.x * model_basis.get_column(0) +
        local_motion.y * model_basis.get_column(1) +
        local_motion.z * model_basis.get_column(2) +
        (this->is_on_floor() ? gd::Vector3{} : gd::Vector3{0.f, -1.f, 0.f})
    };
    this->set_velocity(motion / delta);
    this->move_and_slide();
}

void Player::process_transform_camera(double delta) {
    this->camera_parent->set_global_position(this->get_global_position());
    float const camera_speed{float(delta) * (this->fsm->get_current_node().contains("[aim]") ? this->AIMING_CAMERA_ROTATION_SPEED : this->CAMERA_ROTATION_SPEED)};
    this->camera_parent->rotate_y(this->input_directions.x * -camera_speed);
}

void Player::process_rotate(double delta) {
    if(this->fsm->get_current_node().contains("[turn")) {
        //! the signed angle difference between the left axes of the camera parent and Player
        float const diff = -this->camera_parent->get_global_basis().get_column(0).signed_angle_to(this->get_global_basis().get_column(0), {0.f, 1.f, 0.f});
        //! the maximum rotation to allow for this frame
        float const speed{float(delta) * this->ROTATION_SPEED};
        float const actual_speed{speed < gd::Math::abs(diff) ? gd::Math::sign(diff) * speed : diff};
        // rotate by max allowed or full difference, whichever has the smaller magnitude
        this->rotate_y(actual_speed);
        this->anim_tree->set("parameters/Actions/Stationary [turn]/Turn/blend_position", diff * M_PI_2f);
    } else {
        this->anim_tree->set("parameters/Actions/Stationary [turn_animated]/blend_position", 0.f);
    }
}

void Player::_on_dir_horizontal(gd::Ref<gd::InputEvent>, float value) {
    this->input_directions.x = value;
}

void Player::_on_dir_vertical(gd::Ref<gd::InputEvent>, float value) {
    this->input_directions.y = value;
}

void Player::_on_fire(gd::Ref<gd::InputEvent>, float value) {
    if(value > 0.f) {
        this->input_fire = 0.5;
    }
}

gd::Vector2 Player::get_input_directions() const {
    return this->input_directions;
}

bool Player::get_input_fire() {
    bool const val = this->input_fire > 0.0;
    this->input_fire = 0.0;
    return val;
}