49 lines
1.9 KiB
Rust
49 lines
1.9 KiB
Rust
use crate::CameraProjection;
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use bevy_app::{EventReader, Events};
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use bevy_property::Properties;
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use bevy_window::{WindowCreated, WindowResized, Windows};
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use glam::Mat4;
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use legion::{prelude::*, storage::Component};
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#[derive(Default, Debug, Properties)]
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pub struct Camera {
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pub projection_matrix: Mat4,
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pub name: Option<String>,
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}
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pub fn camera_system<T: CameraProjection + Component>() -> Box<dyn Schedulable> {
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let mut window_resized_event_reader = EventReader::<WindowResized>::default();
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let mut window_created_event_reader = EventReader::<WindowCreated>::default();
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(move |world: &mut SubWorld,
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window_resized_events: Res<Events<WindowResized>>,
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window_created_events: Res<Events<WindowCreated>>,
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windows: Res<Windows>,
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query: &mut Query<(Write<Camera>, Write<T>)>| {
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let primary_window_resized_event = window_resized_event_reader
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.find_latest(&window_resized_events, |event| event.is_primary);
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for event in window_created_event_reader.iter(&window_created_events) {
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if !event.is_primary {
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continue;
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}
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if let Some(window) = windows.get(event.id) {
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for (mut camera, mut camera_projection) in query.iter_mut(world) {
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camera_projection.update(window.width as usize, window.height as usize);
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camera.projection_matrix = camera_projection.get_projection_matrix();
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}
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}
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}
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if let Some(primary_window_resized_event) = primary_window_resized_event {
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for (mut camera, mut camera_projection) in query.iter_mut(world) {
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camera_projection.update(
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primary_window_resized_event.width,
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primary_window_resized_event.height,
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);
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camera.projection_matrix = camera_projection.get_projection_matrix();
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}
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}
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})
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.system()
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}
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