bevy/examples/2d/pipelined_texture_atlas.rs
Mike 95032a3f97 change texture atlas sprite indexing to usize (#2887)
Per this comment https://github.com/bevyengine/bevy/pull/2864#discussion_r717947232,
I have done a pass at changing all the public facing indexes for `TextureAtlas` to usize.
2021-11-01 21:28:50 +00:00

94 lines
3.2 KiB
Rust

use bevy::{
asset::LoadState,
math::Vec3,
prelude::{
App, AssetServer, Assets, Commands, HandleUntyped, IntoSystem, Res, ResMut, State,
SystemSet, Transform,
},
render2::{camera::OrthographicCameraBundle, texture::Image},
sprite2::{
PipelinedSpriteBundle, PipelinedSpriteSheetBundle, TextureAtlas, TextureAtlasBuilder,
TextureAtlasSprite,
},
PipelinedDefaultPlugins,
};
/// In this example we generate a new texture atlas (sprite sheet) from a folder containing
/// individual sprites
fn main() {
App::new()
.init_resource::<RpgSpriteHandles>()
.add_plugins(PipelinedDefaultPlugins)
.add_state(AppState::Setup)
.add_system_set(SystemSet::on_enter(AppState::Setup).with_system(load_textures.system()))
.add_system_set(SystemSet::on_update(AppState::Setup).with_system(check_textures.system()))
.add_system_set(SystemSet::on_enter(AppState::Finished).with_system(setup.system()))
.run();
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
enum AppState {
Setup,
Finished,
}
#[derive(Default)]
struct RpgSpriteHandles {
handles: Vec<HandleUntyped>,
}
fn load_textures(mut rpg_sprite_handles: ResMut<RpgSpriteHandles>, asset_server: Res<AssetServer>) {
rpg_sprite_handles.handles = asset_server.load_folder("textures/rpg").unwrap();
}
fn check_textures(
mut state: ResMut<State<AppState>>,
rpg_sprite_handles: ResMut<RpgSpriteHandles>,
asset_server: Res<AssetServer>,
) {
if let LoadState::Loaded =
asset_server.get_group_load_state(rpg_sprite_handles.handles.iter().map(|handle| handle.id))
{
state.set(AppState::Finished).unwrap();
}
}
fn setup(
mut commands: Commands,
rpg_sprite_handles: Res<RpgSpriteHandles>,
asset_server: Res<AssetServer>,
mut texture_atlases: ResMut<Assets<TextureAtlas>>,
mut textures: ResMut<Assets<Image>>,
) {
let mut texture_atlas_builder = TextureAtlasBuilder::default();
for handle in rpg_sprite_handles.handles.iter() {
let texture = textures.get(handle).unwrap();
texture_atlas_builder.add_texture(handle.clone_weak().typed::<Image>(), texture);
}
let texture_atlas = texture_atlas_builder.finish(&mut textures).unwrap();
let texture_atlas_texture = texture_atlas.texture.clone();
let vendor_handle = asset_server.get_handle("textures/rpg/chars/vendor/generic-rpg-vendor.png");
let vendor_index = texture_atlas.get_texture_index(&vendor_handle).unwrap();
let atlas_handle = texture_atlases.add(texture_atlas);
// set up a scene to display our texture atlas
commands.spawn_bundle(OrthographicCameraBundle::new_2d());
// draw a sprite from the atlas
commands.spawn_bundle(PipelinedSpriteSheetBundle {
transform: Transform {
translation: Vec3::new(150.0, 0.0, 0.0),
scale: Vec3::splat(4.0),
..Default::default()
},
sprite: TextureAtlasSprite::new(vendor_index),
texture_atlas: atlas_handle,
..Default::default()
});
// draw the atlas itself
commands.spawn_bundle(PipelinedSpriteBundle {
texture: texture_atlas_texture,
transform: Transform::from_xyz(-300.0, 0.0, 0.0),
..Default::default()
});
}