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|
use glam::{IVec2, Vec2};
use crate::{
config::CAMERA_MOVEMENT_SPEED,
input::{Input, InputManager},
sim::{entity::EntityId, sim_manager::SimManager},
};
#[repr(C)]
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
pub struct CameraUniform {
pub scale: [f32; 2],
pub centre: [f32; 2],
}
pub struct Camera {
pub zoom: f32,
pub centre: Vec2,
screen_size: IVec2,
}
impl Camera {
fn scale(&self) -> Vec2 {
let half = self.zoom * self.screen_size.as_vec2() / 2.0;
Vec2::new(1.0 / half.x, -1.0 / half.y)
}
// (lower, upper)
pub fn viewport_bounds_world(&self) -> (Vec2, Vec2) {
let lower = self.screen_position_to_world(Vec2::ZERO);
let upper = self.screen_position_to_world(self.screen_size.as_vec2());
(lower, upper)
}
pub fn screen_position_to_world(&self, pos: Vec2) -> Vec2 {
let scale = self.scale();
let ndc = pos / self.screen_size.as_vec2() * 2.0 - 1.0;
let world = Vec2::new(
ndc.x / scale.x + self.centre.x,
ndc.y / -scale.y + self.centre.y,
);
world
}
pub fn to_uniform(&self) -> CameraUniform {
CameraUniform {
scale: self.scale().to_array(),
centre: self.centre.to_array(),
}
}
pub fn resize(&mut self, screen_size: IVec2) {
self.screen_size = screen_size;
}
pub fn new(screen_size: IVec2) -> Self {
Camera {
zoom: 0.12,
centre: Vec2::ZERO,
screen_size,
}
}
}
pub enum CameraControllerMode {
Free,
TrackEntity(EntityId),
}
pub struct CameraController {
camera: Camera,
mode: CameraControllerMode,
}
impl CameraController {
pub fn track_entity(&mut self, entity_id: EntityId) {
self.mode = CameraControllerMode::TrackEntity(entity_id);
}
pub fn free_camera(&mut self) {
self.mode = CameraControllerMode::Free;
}
pub fn camera(&self) -> &Camera {
&self.camera
}
pub fn camera_mut(&mut self) -> &mut Camera {
&mut self.camera
}
pub fn update(&mut self, input_manager: &InputManager, sim: &SimManager, delta_time: f32) {
match self.mode {
CameraControllerMode::Free => {
let x: f32 = if input_manager.held(Input::CameraLeft) {
-1.0
} else if input_manager.held(Input::CameraRight) {
1.0
} else {
0.0
};
let y: f32 = if input_manager.held(Input::CameraDown) {
1.0
} else if input_manager.held(Input::CameraUp) {
-1.0
} else {
0.0
};
if x == 0.0 && y == 0.0 {
return;
}
let magnitude = (x.powi(2) + y.powi(2)).sqrt();
let adjusted_x =
x / magnitude * self.camera.zoom * CAMERA_MOVEMENT_SPEED * delta_time;
let adjusted_y =
y / magnitude * self.camera.zoom * CAMERA_MOVEMENT_SPEED * delta_time;
self.camera.centre += Vec2::new(adjusted_x, adjusted_y);
}
CameraControllerMode::TrackEntity(entity_id) => {
if let Some(entity) = sim.entities.get(&entity_id) {
let (position, _) = entity.data._transform(&sim.rb_manager).unwrap();
self.camera.centre = position;
}
}
}
}
pub fn new(screen_size: IVec2, mode: CameraControllerMode) -> Self {
let camera = Camera::new(screen_size);
CameraController { camera, mode }
}
}
|
