mirror of
https://github.com/bevyengine/bevy
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8ad9a7c7c4
# Objective The documentation for camera priority is very confusing at the moment, it requires a bit of "double negative" kind of thinking. # Solution Flipping the wording on the documentation to reflect more common usecases like having an overlay camera and also renaming it to "order", since priority implies that it will override the other camera rather than have both run.
111 lines
3.5 KiB
Rust
111 lines
3.5 KiB
Rust
//! Renders two cameras to the same window to accomplish "split screen".
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use std::f32::consts::PI;
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use bevy::{
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core_pipeline::clear_color::ClearColorConfig,
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prelude::*,
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render::camera::Viewport,
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window::{WindowId, WindowResized},
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};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_startup_system(setup)
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.add_system(set_camera_viewports)
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.run();
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}
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/// set up a simple 3D scene
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fn setup(
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mut commands: Commands,
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asset_server: Res<AssetServer>,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<StandardMaterial>>,
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) {
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// plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 100.0 })),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..default()
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});
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commands.spawn(SceneBundle {
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scene: asset_server.load("models/animated/Fox.glb#Scene0"),
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..default()
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});
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// Light
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commands.spawn(DirectionalLightBundle {
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transform: Transform::from_rotation(Quat::from_euler(EulerRot::ZYX, 0.0, 1.0, -PI / 4.)),
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directional_light: DirectionalLight {
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shadows_enabled: true,
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..default()
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},
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..default()
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});
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// Left Camera
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commands.spawn((
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Camera3dBundle {
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transform: Transform::from_xyz(0.0, 200.0, -100.0).looking_at(Vec3::ZERO, Vec3::Y),
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..default()
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},
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LeftCamera,
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));
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// Right Camera
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commands.spawn((
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Camera3dBundle {
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transform: Transform::from_xyz(100.0, 100., 150.0).looking_at(Vec3::ZERO, Vec3::Y),
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camera: Camera {
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// Renders the right camera after the left camera, which has a default priority of 0
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order: 1,
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..default()
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},
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camera_3d: Camera3d {
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// don't clear on the second camera because the first camera already cleared the window
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clear_color: ClearColorConfig::None,
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..default()
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},
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..default()
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},
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RightCamera,
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));
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}
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#[derive(Component)]
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struct LeftCamera;
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#[derive(Component)]
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struct RightCamera;
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fn set_camera_viewports(
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windows: Res<Windows>,
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mut resize_events: EventReader<WindowResized>,
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mut left_camera: Query<&mut Camera, (With<LeftCamera>, Without<RightCamera>)>,
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mut right_camera: Query<&mut Camera, With<RightCamera>>,
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) {
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// We need to dynamically resize the camera's viewports whenever the window size changes
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// so then each camera always takes up half the screen.
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// A resize_event is sent when the window is first created, allowing us to reuse this system for initial setup.
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for resize_event in resize_events.iter() {
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if resize_event.id == WindowId::primary() {
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let window = windows.primary();
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let mut left_camera = left_camera.single_mut();
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left_camera.viewport = Some(Viewport {
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physical_position: UVec2::new(0, 0),
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physical_size: UVec2::new(window.physical_width() / 2, window.physical_height()),
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..default()
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});
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let mut right_camera = right_camera.single_mut();
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right_camera.viewport = Some(Viewport {
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physical_position: UVec2::new(window.physical_width() / 2, 0),
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physical_size: UVec2::new(window.physical_width() / 2, window.physical_height()),
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..default()
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});
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}
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}
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}
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