83 lines
2.2 KiB
Rust
83 lines
2.2 KiB
Rust
use anyhow::Result;
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use ecs::*;
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use engine::prelude::*;
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fn main() -> Result<()> {
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let mut world_builder = World::builder();
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Engine::new::<GameState>(EngineCreateInfo::default(), &mut world_builder)?;
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world_builder.add_system(10, GameState::update);
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world_builder.resources.insert(GameState::default());
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let scene: &mut Scene = world_builder.resources.get_mut()?;
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let view = scene.view_mut();
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let camera_control = FreeCameraControl::new(view)?;
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world_builder.resources.insert(camera_control);
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world_builder.build().run()
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}
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#[derive(Default, Resource)]
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enum GameState {
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#[default]
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Startup,
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Game(Game),
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}
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impl GameState {
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fn update(world: &mut World) -> Result<bool> {
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let me = world.resources.get_mut_unchecked::<Self>();
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match me {
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GameState::Startup => *me = GameState::Game(Game),
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GameState::Game(game) => game.update(world)?,
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}
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Ok(true)
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}
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}
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impl EventConsumer for GameState {
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fn event(&mut self, world: &mut World, event: EngineEvent<'_>) -> Result<()> {
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match self {
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GameState::Startup => (),
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GameState::Game(game) => game.event(world, event)?,
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}
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Ok(())
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}
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}
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struct Game;
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impl Game {
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fn update(&mut self, _world: &mut World) -> Result<()> {
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Ok(())
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}
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fn event(&mut self, world: &mut World, event: EngineEvent<'_>) -> Result<()> {
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match event {
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EngineEvent::MouseButtonDown(MouseButton::Left) => {
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let camera_control: &mut FreeCameraControl = world.resources.get_mut()?;
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camera_control.mouse_down();
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}
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EngineEvent::MouseButtonUp(MouseButton::Left) => {
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let camera_control: &mut FreeCameraControl = world.resources.get_mut()?;
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camera_control.mouse_release();
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}
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EngineEvent::MouseMotion(x, y) => {
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let (scene, camera_control): (&mut Scene, &mut FreeCameraControl) =
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world.resources.get_mut()?;
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camera_control.mouse_move(x, y, scene.view_mut())?;
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}
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_ => (),
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}
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Ok(())
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}
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}
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