bevy/examples/entity_builder_comparison.rs

use bevy::prelude::*;

fn main() {
    AppBuilder::new().add_defaults().setup_world(setup).run();
}

#[allow(dead_code)]
fn create_entities_insert_vec(world: &mut World, plane_handle: Handle<Mesh>, cube_handle: Handle<Mesh>) {
    // plane
    world.insert(
        (),
        vec![(
            plane_handle.clone(),
            Material::new(Albedo::Color(math::vec4(0.1, 0.2, 0.1, 1.0))),
            LocalToWorld::identity(),
            Translation::new(0.0, 0.0, 0.0),
        )],
    );

    // cube
    world.insert(
        (),
        vec![(
            cube_handle,
            Material::new(Albedo::Color(math::vec4(0.5, 0.3, 0.3, 1.0))),
            LocalToWorld::identity(),
            Translation::new(0.0, 0.0, 1.0),
        )],
    );

    // light
    world.insert(
        (),
        vec![(
            Light {
                color: wgpu::Color {
                    r: 0.8,
                    g: 0.8,
                    b: 0.5,
                    a: 1.0,
                },
                fov: f32::to_radians(60.0),
                depth: 0.1..50.0,
                target_view: None,
            },
            LocalToWorld::identity(),
            Translation::new(4.0, -4.0, 5.0),
            Rotation::from_euler_angles(0.0, 0.0, 0.0),
        )],
    );

    // camera
    world.insert(
        (),
        vec![(
            Camera::new(CameraType::Projection {
                fov: std::f32::consts::PI / 4.0,
                near: 1.0,
                far: 1000.0,
                aspect_ratio: 1.0,
            }),
            ActiveCamera,
            LocalToWorld(Mat4::look_at_rh(
                Vec3::new(3.0, 8.0, 5.0),
                Vec3::new(0.0, 0.0, 0.0),
                Vec3::new(0.0, 0.0, 1.0),
            )),
        )],
    );
}

#[allow(dead_code)]
fn create_entities_builder_add_component(world: &mut World, plane_handle: Handle<Mesh>, cube_handle: Handle<Mesh>) {
    world.build()
        // plane
        .build_entity()
            .add(plane_handle.clone())
            .add(Material::new(Albedo::Color(math::vec4(0.1, 0.2, 0.1, 1.0))))
            .add(LocalToWorld::identity())
            .add(Translation::new(0.0, 0.0, 0.0))
        // cube
        .build_entity()
            .add(cube_handle)
            .add(Material::new(Albedo::Color(math::vec4(0.5, 0.3, 0.3, 1.0))))
            .add(LocalToWorld::identity())
            .add(Translation::new(0.0, 0.0, 1.0))
        // light
        .build_entity()
            .add(Light {
                color: wgpu::Color {
                    r: 0.8,
                    g: 0.8,
                    b: 0.5,
                    a: 1.0,
                },
                fov: f32::to_radians(60.0),
                depth: 0.1..50.0,
                target_view: None,
            })
            .add(LocalToWorld::identity())
            .add(Translation::new(4.0, -4.0, 5.0))
            .add(Rotation::from_euler_angles(0.0, 0.0, 0.0))
        // camera
        .build_entity()
            .add(Camera::new(CameraType::Projection {
                fov: std::f32::consts::PI / 4.0,
                near: 1.0,
                far: 1000.0,
                aspect_ratio: 1.0,
            }))
            .add(ActiveCamera)
            .add(LocalToWorld(Mat4::look_at_rh(
                Vec3::new(3.0, 8.0, 5.0),
                Vec3::new(0.0, 0.0, 0.0),
                Vec3::new(0.0, 0.0, 1.0),
            )))
    .build();
}

fn create_entities_builder_archetype(world: &mut World, plane_handle: Handle<Mesh>, cube_handle: Handle<Mesh>) {
    world.build()
        // plane
        .build_archetype(Object3dEntity {
            mesh: plane_handle.clone(),
            material: Material::new(Albedo::Color(math::vec4(0.1, 0.2, 0.1, 1.0))),
            local_to_world: LocalToWorld::identity(),
            translation: Translation::new(0.0, 0.0, 0.0),
        })
        // cube
        .build_archetype(Object3dEntity {
            mesh: cube_handle,
            material: Material::new(Albedo::Color(math::vec4(0.5, 0.3, 0.3, 1.0))),
            local_to_world: LocalToWorld::identity(),
            translation: Translation::new(0.0, 0.0, 1.0),
        })
        // light
        .build_archetype(LightEntity {
            light: Light {
                color: wgpu::Color {
                    r: 0.8,
                    g: 0.8,
                    b: 0.5,
                    a: 1.0,
                },
                fov: f32::to_radians(60.0),
                depth: 0.1..50.0,
                target_view: None,
            },
            local_to_world: LocalToWorld::identity(),
            translation: Translation::new(4.0, -4.0, 5.0),
            rotation: Rotation::from_euler_angles(0.0, 0.0, 0.0),
        })
        // camera
        .build_archetype(CameraEntity {
            camera: Camera::new(CameraType::Projection {
                fov: std::f32::consts::PI / 4.0,
                near: 1.0,
                far: 1000.0,
                aspect_ratio: 1.0,
            }),
            active_camera: ActiveCamera,
            local_to_world: LocalToWorld(Mat4::look_at_rh(
                Vec3::new(3.0, 8.0, 5.0),
                Vec3::new(0.0, 0.0, 0.0),
                Vec3::new(0.0, 0.0, 1.0),
            )),
        })
    .build();
}

fn setup(world: &mut World) {
    let cube = Mesh::load(MeshType::Cube);
    let plane = Mesh::load(MeshType::Plane { size: 10.0 });

    let (cube_handle, plane_handle) = {
        let mut mesh_storage = world.resources.get_mut::<AssetStorage<Mesh>>().unwrap();
        (mesh_storage.add(cube), mesh_storage.add(plane))
    };

    // no-archetype precompile: 1.24 sec
    // archetype precompile: 1.07 sec
    // create_entities_insert_vec(world, plane_handle, cube_handle);

    // no-archetype precompile: .93
    // noarchetype precompile: .93
    // create_entities_builder_add_component(world, plane_handle, cube_handle);

    // archetype precompile: 0.65 
    create_entities_builder_archetype(world, plane_handle, cube_handle);
}