bevy/crates/bevy_ui/src/widget
Félix Lescaudey de Maneville 135c7240f1
Texture Atlas rework (#5103)
# Objective

> Old MR: #5072 
> ~~Associated UI MR: #5070~~
> Adresses #1618

Unify sprite management

## Solution

- Remove the `Handle<Image>` field in `TextureAtlas` which is the main
cause for all the boilerplate
- Remove the redundant `TextureAtlasSprite` component
- Renamed `TextureAtlas` asset to `TextureAtlasLayout`
([suggestion](https://github.com/bevyengine/bevy/pull/5103#discussion_r917281844))
- Add a `TextureAtlas` component, containing the atlas layout handle and
the section index

The difference between this solution and #5072 is that instead of the
`enum` approach is that we can more easily manipulate texture sheets
without any breaking changes for classic `SpriteBundle`s (@mockersf
[comment](https://github.com/bevyengine/bevy/pull/5072#issuecomment-1165836139))

Also, this approach is more *data oriented* extracting the
`Handle<Image>` and avoiding complex texture atlas manipulations to
retrieve the texture in both applicative and engine code.
With this method, the only difference between a `SpriteBundle` and a
`SpriteSheetBundle` is an **additional** component storing the atlas
handle and the index.

~~This solution can be applied to `bevy_ui` as well (see #5070).~~

EDIT: I also applied this solution to Bevy UI

## Changelog

- (**BREAKING**) Removed `TextureAtlasSprite`
- (**BREAKING**) Renamed `TextureAtlas` to `TextureAtlasLayout`
- (**BREAKING**) `SpriteSheetBundle`:
  - Uses a  `Sprite` instead of a `TextureAtlasSprite` component
- Has a `texture` field containing a `Handle<Image>` like the
`SpriteBundle`
- Has a new `TextureAtlas` component instead of a
`Handle<TextureAtlasLayout>`
- (**BREAKING**) `DynamicTextureAtlasBuilder::add_texture` takes an
additional `&Handle<Image>` parameter
- (**BREAKING**) `TextureAtlasLayout::from_grid` no longer takes a
`Handle<Image>` parameter
- (**BREAKING**) `TextureAtlasBuilder::finish` now returns a
`Result<(TextureAtlasLayout, Handle<Image>), _>`
- `bevy_text`:
  - `GlyphAtlasInfo` stores the texture `Handle<Image>`
  - `FontAtlas` stores the texture `Handle<Image>`
- `bevy_ui`:
- (**BREAKING**) Removed `UiAtlasImage` , the atlas bundle is now
identical to the `ImageBundle` with an additional `TextureAtlas`

## Migration Guide

* Sprites

```diff
fn my_system(
  mut images: ResMut<Assets<Image>>, 
-  mut atlases: ResMut<Assets<TextureAtlas>>, 
+  mut atlases: ResMut<Assets<TextureAtlasLayout>>, 
  asset_server: Res<AssetServer>
) {
    let texture_handle: asset_server.load("my_texture.png");
-   let layout = TextureAtlas::from_grid(texture_handle, Vec2::new(25.0, 25.0), 5, 5, None, None);
+   let layout = TextureAtlasLayout::from_grid(Vec2::new(25.0, 25.0), 5, 5, None, None);
    let layout_handle = atlases.add(layout);
    commands.spawn(SpriteSheetBundle {
-      sprite: TextureAtlasSprite::new(0),
-      texture_atlas: atlas_handle,
+      atlas: TextureAtlas {
+         layout: layout_handle,
+         index: 0
+      },
+      texture: texture_handle,
       ..Default::default()
     });
}
```
* UI


```diff
fn my_system(
  mut images: ResMut<Assets<Image>>, 
-  mut atlases: ResMut<Assets<TextureAtlas>>, 
+  mut atlases: ResMut<Assets<TextureAtlasLayout>>, 
  asset_server: Res<AssetServer>
) {
    let texture_handle: asset_server.load("my_texture.png");
-   let layout = TextureAtlas::from_grid(texture_handle, Vec2::new(25.0, 25.0), 5, 5, None, None);
+   let layout = TextureAtlasLayout::from_grid(Vec2::new(25.0, 25.0), 5, 5, None, None);
    let layout_handle = atlases.add(layout);
    commands.spawn(AtlasImageBundle {
-      texture_atlas_image: UiTextureAtlasImage {
-           index: 0,
-           flip_x: false,
-           flip_y: false,
-       },
-      texture_atlas: atlas_handle,
+      atlas: TextureAtlas {
+         layout: layout_handle,
+         index: 0
+      },
+      image: UiImage {
+           texture: texture_handle,
+           flip_x: false,
+           flip_y: false,
+       },
       ..Default::default()
     });
}
```

---------

Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
Co-authored-by: François <mockersf@gmail.com>
Co-authored-by: IceSentry <IceSentry@users.noreply.github.com>
2024-01-16 13:59:08 +00:00
..
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image.rs Texture Atlas rework (#5103) 2024-01-16 13:59:08 +00:00
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text.rs Texture Atlas rework (#5103) 2024-01-16 13:59:08 +00:00