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|
use ecs::component::local::Local;
use ecs::sole::Single;
use ecs::system::{Into, System};
use ecs::{Component, Query};
use glfw::window::{Key, KeyState};
use crate::camera::Camera;
use crate::delta_time::DeltaTime;
use crate::event::Update as UpdateEvent;
use crate::input::{Cursor, Keys};
use crate::vector::{Vec2, Vec3};
/// Fly camera extension.
pub struct Extension(pub Options);
impl ecs::extension::Extension for Extension
{
fn collect(self, mut collector: ecs::extension::Collector<'_>)
{
collector.add_system(
UpdateEvent,
update.into_system().initialize((
CursorState {
current_yaw: -90.0,
..Default::default()
},
self.0,
)),
);
}
}
#[derive(Debug, Component)]
pub struct Options
{
pub camera_speed: f32,
pub mouse_sensitivity: f32,
}
fn update(
camera_query: Query<(Camera,)>,
keys: Single<Keys>,
cursor: Single<Cursor>,
delta_time: Single<DeltaTime>,
mut cursor_state: Local<CursorState>,
options: Local<Options>,
)
{
let Some((mut camera,)) = camera_query.iter().next() else {
#[cfg(feature = "debug")]
tracing::warn!("No camera");
return;
};
if cursor.has_moved && cursor_state.first_mouse {
println!("First cursor move");
cursor_state.last_pos = cursor.position;
cursor_state.first_mouse = false;
}
let delta_time = delta_time.duration;
let mut x_offset = cursor.position.x - cursor_state.last_pos.x;
let mut y_offset = cursor_state.last_pos.y - cursor.position.y;
cursor_state.last_pos = cursor.position;
x_offset *= f64::from(options.mouse_sensitivity);
y_offset *= f64::from(options.mouse_sensitivity);
cursor_state.current_yaw += x_offset;
cursor_state.current_pitch += y_offset;
cursor_state.current_pitch = cursor_state.current_pitch.clamp(-89.0, 89.0);
// TODO: This casting to a f32 from a f64 is horrible. fix it
#[allow(clippy::cast_possible_truncation)]
let direction = Vec3 {
x: (cursor_state.current_yaw.to_radians().cos()
* cursor_state.current_pitch.to_radians().cos()) as f32,
y: cursor_state.current_pitch.to_radians().sin() as f32,
z: (cursor_state.current_yaw.to_radians().sin()
* cursor_state.current_pitch.to_radians().cos()) as f32,
}
.normalize();
let cam_right = direction.cross(&Vec3::UP).normalize();
camera.global_up = cam_right.cross(&direction).normalize();
if matches!(keys.get_key_state(Key::W), KeyState::Pressed) {
camera.position += direction * options.camera_speed * delta_time.as_secs_f32();
}
if matches!(keys.get_key_state(Key::S), KeyState::Pressed) {
camera.position -= direction * options.camera_speed * delta_time.as_secs_f32();
}
if matches!(keys.get_key_state(Key::A), KeyState::Pressed) {
let cam_left = -direction.cross(&Vec3::UP).normalize();
camera.position += cam_left * options.camera_speed * delta_time.as_secs_f32();
}
if matches!(keys.get_key_state(Key::D), KeyState::Pressed) {
let cam_right = direction.cross(&Vec3::UP).normalize();
camera.position += cam_right * options.camera_speed * delta_time.as_secs_f32();
}
camera.target = camera.position + direction;
}
#[derive(Debug, Component)]
struct CursorState
{
last_pos: Vec2<f64>,
current_pitch: f64,
current_yaw: f64,
first_mouse: bool,
}
impl Default for CursorState
{
fn default() -> Self
{
Self {
last_pos: Vec2::default(),
current_pitch: 0.0,
current_yaw: 0.0,
first_mouse: true,
}
}
}
|
