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use crate::{Input, config::CAMERA_MOVEMENT_SPEED};
#[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: (f32, f32),
screen_size: (i32, i32),
}
impl Camera {
fn scale(&self) -> (f32, f32) {
let half_w = self.zoom * self.screen_size.0 as f32 / 2.0;
let half_h = self.zoom * self.screen_size.1 as f32 / 2.0;
(1.0 / half_w, -1.0 / half_h)
}
// xl, xu, yl, yu
pub fn viewport_bounds_world(&self) -> (f32, f32, f32, f32) {
let (xl, yl) = self.screen_position_to_world(0.0, 0.0);
let (xu, yu) =
self.screen_position_to_world(self.screen_size.0 as f32, self.screen_size.1 as f32);
(xl, xu, yl, yu)
}
pub fn handle_camera_input(&mut self, input: &Input, delta_time: f32) {
// wasd movement
let x: f32 = if input.is_left_pressed {
-1.0
} else if input.is_right_pressed {
1.0
} else {
0.0
};
let y: f32 = if input.is_down_pressed {
1.0
} else if input.is_up_pressed {
-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.zoom * CAMERA_MOVEMENT_SPEED * delta_time;
let adjusted_y = y / magnitude * self.zoom * CAMERA_MOVEMENT_SPEED * delta_time;
self.centre.0 += adjusted_x;
self.centre.1 += adjusted_y;
}
pub fn screen_position_to_world(&self, x: f32, y: f32) -> (f32, f32) {
let (scale_x, scale_y) = self.scale();
let ndc_x = x / self.screen_size.0 as f32 * 2.0 - 1.0;
let world_x = ndc_x / scale_x + self.centre.0;
let ndc_y = y / self.screen_size.1 as f32 * 2.0 - 1.0;
let world_y = ndc_y / -scale_y + self.centre.1;
(world_x, world_y)
}
pub fn to_uniform(&self) -> CameraUniform {
let (scale_x, scale_y) = self.scale();
CameraUniform {
scale: [scale_x, scale_y],
centre: [self.centre.0, self.centre.1],
}
}
pub fn resize(&mut self, screen_size: (i32, i32)) {
self.screen_size = screen_size;
}
pub fn new(screen_size: (i32, i32)) -> Self {
Camera {
zoom: 0.15,
centre: (0.0, 0.0),
screen_size,
}
}
}
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