[Merged by Bors] - 0.7 migration guide

content/learn/book/migration-guides/0.5-0.6/_index.md

@@ -1,6 +1,6 @@
 +++
 title = "0.5 to 0.6"
-weight = 1
+weight = 2
 sort_by = "weight"
 template = "book-section.html"
 page_template = "book-section.html"
@@ -309,8 +309,9 @@ SpriteBundle {
 }
 ```
 
-### Visible is now Visibility 
-The {{rust_type(type="struct" crate="bevy" mod="render::draw" version="0.5.0" name="Visible" no_mod=true)}} struct, which is used in a number of components to set visibility, was renamed to {{rust_type(type="struct" crate="bevy" mod="render::view" version="0.6.0" name="Visibility" no_mod=true)}}. Additionally, the field `is_transparent` was removed from the struct. For 3D, transparency can be set using the `alpha_mode` field on a material. Transparency is now automatically enabled for all objects in 2D. 
+### Visible is now Visibility
+
+The {{rust_type(type="struct" crate="bevy" mod="render::draw" version="0.5.0" name="Visible" no_mod=true)}} struct, which is used in a number of components to set visibility, was renamed to {{rust_type(type="struct" crate="bevy" mod="render::view" version="0.6.0" name="Visibility" no_mod=true)}}. Additionally, the field `is_transparent` was removed from the struct. For 3D, transparency can be set using the `alpha_mode` field on a material. Transparency is now automatically enabled for all objects in 2D.
 
 ```rust
 // 0.5

content/learn/book/migration-guides/0.6-0.7/_index.md

@@ -0,0 +1,298 @@
++++
+title = "0.6 to 0.7"
+weight = 3
+sort_by = "weight"
+template = "book-section.html"
+page_template = "book-section.html"
+insert_anchor_links = "right"
+[extra]
+long_title = "Migration Guide: 0.6 to 0.7"
++++
+
+<!-- Github filter used to find the relevant PRs "is:pr label:C-Breaking-Change closed:>2022-02-01 [Merged by Bors]" -->
+
+### [ParamSet for conflicting SystemParam](https://github.com/bevyengine/bevy/pull/2765)
+
+```rs
+// 0.6
+fn system(
+    mut transforms: QuerySet<(
+        QueryState<&mut Transform, With<Marker>>,
+        QueryState<&Transform>,
+    )>,
+) {
+    for transform in transforms.q1().iter() {
+        // ...
+    }
+}
+// 0.7
+fn system(
+    mut transforms: ParamSet<(
+        Query<&mut Transform, With<Marker>>,
+        Query<&Transform>
+    )>,
+) {
+    for transform in transforms.p1().iter() {
+        // ...
+    }
+}
+```
+
+### [AliasedMutability](https://github.com/bevyengine/bevy/pull/4298)
+
+The `QueryEntityError` enum now has a `AliasedMutability` variant, and returns the offending entity.
+
+### [Remove margins.rs](https://github.com/bevyengine/bevy/pull/4284)
+
+The `Margins` type was removed. To migrate, replace every occurrence of `Margins` with `Rect`.
+
+### [Remove face_toward.rs](https://github.com/bevyengine/bevy/pull/4277https://github.com/bevyengine/bevy/pull/4277)
+
+The `FaceToward` trait was removed. To migrate, replace every occurrence of `Mat4::face_toward` to `Mat4::look_at_rh`.
+
+### [`World::entities_mut` is now unsafe](https://github.com/bevyengine/bevy/pull/4093)
+
+```rs
+// 0.6
+world.entities_mut()
+
+// 0.7
+unsafe { world.entities_mut() }
+```
+
+### [Custom vertex attributes](https://github.com/bevyengine/bevy/pull/3959)
+
+Custom vertex attributes are now referenced by a `MeshVertexAttribute` rather than a simple string and `set_attribute` has been renamed to `insert_attribute` better reflect its behavior.
+
+```rs
+// 0.6
+mesh.set_attribute("Vertex_Custom", VertexAttributeValues::Sint32x4(vec![]));
+
+// 0.7
+// Generate your own random identifier here.
+// https://play.rust-lang.org/?gist=cc7e824724ba023e9bff25db35ef1f5e
+pub const ATTRIBUTE_CUSTOM: MeshVertexAttribute =
+    MeshVertexAttribute::new("Custom", 17351772347970238659, VertexFormat::Sint32x4);
+mesh.insert_attribute(
+    ATTRIBUTE_CUSTOM,
+    VertexAttributeValues::Sint32x4(vec![]),
+);
+```
+
+### [Mesh vertex buffer layouts](https://github.com/bevyengine/bevy/pull/3959)
+
+Vertex buffers no longer need to be manually laid out with offset and stride values in a `RenderPipelineDescriptor`.
+
+```rs
+// 0.6
+let vertex_buffer_layout = VertexBufferLayout {
+    array_stride: 20,
+    step_mode: VertexStepMode::Vertex,
+    attributes: vec![
+        VertexAttribute {
+            format: VertexFormat::Float32x3,
+            offset: 0,
+            shader_location: 0,
+        },
+        VertexAttribute {
+            format: VertexFormat::Float32x2,
+            offset: 12,
+            shader_location: 1,
+        },
+    ],
+};
+
+// 0.7
+let mut formats = vec![
+    VertexFormat::Float32x3,
+    VertexFormat::Float32x2,
+];
+let vertex_layout = VertexBufferLayout::from_vertex_formats(VertexStepMode::Vertex, formats);
+```
+
+### [Remove the need for 'IntoSystem::into_system()' when using run criteria piping](https://github.com/bevyengine/bevy/pull/3923)
+
+```rs
+// 0.6
+.with_run_criteria(RunCriteria::pipe(
+    "is_done_label",
+    IntoSystem::into_system(inverse),
+))
+
+// 0.7
+.with_run_criteria(RunCriteria::pipe("is_done_label", inverse))
+```
+
+### [Remove RunSystem](https://github.com/bevyengine/bevy/pull/3817)
+
+You probably should not have been using [`RunSystem`] or [`ParamSystem`], but if you were and you really need it, please make sure to let us know by creating a new discussion over at <https://github.com/bevyengine/bevy/discussions>
+
+<!-- TODO add links to RunSystem and ParamSystem maybe? -->
+
+### [Replace VSync with PresentMode](https://github.com/bevyengine/bevy/pull/3812)
+
+Instead of using a boolean flag for vsync we switched to using a [`PresentMode`] enum with multiple variants.
+
+```rs
+// 0.6
+App::new()
+    .insert_resource(WindowDescriptor {
+        vsync: false,
+        ..Default::default()
+    })
+
+// 0.7
+App::new()
+    .insert_resource(WindowDescriptor {
+        present_mode: PresentMode::Immediate,
+        ..Default::default()
+    })
+```
+
+<!-- TODO make sure this works after release -->
+[`PresentMode`]: https://docs.rs/bevy/0.7/bevy/window/enum.PresentMode.html
+
+### [Fix mul_vec3 tranformation order](https://github.com/bevyengine/bevy/pull/3811)
+
+Transforms are now consistently applied in the standard scale -> rotate -> translate. This doesn't require any code changes unless you had something to handle the wrong behaviour, but it means SpriteBundle will now behave as expected when rotating.
+
+### [Use marker components for cameras instead of name strings](https://github.com/bevyengine/bevy/pull/3635)
+
+```rs
+// 0.6
+pub const FIRST_PASS_CAMERA: &str = "first_pass_camera";
+fn setup(mut commands: Commands) {
+    commands.spawn_bundle(PerspectiveCameraBundle {
+        camera: Camera {
+            name: Some(FIRST_PASS_CAMERA.to_string()),
+            ..Default::default()
+        },
+        transform: Transform::from_translation(Vec3::new(0.0, 0.0, 15.0))
+            .looking_at(Vec3::default(), Vec3::Y),
+        ..Default::default()
+    });
+}
+
+fn camera_system(cameras: Query<&Camera>) {
+    for camera in cameras.iter() {
+        if camera.name == Some(FIRST_PASS_CAMERA.to_string()) {
+            // Do something with a camera
+        }
+    }
+}
+
+// 0.7
+#[derive(Component, Default)]
+pub struct FirstPassCamera;
+
+fn setup(mut commands: Commands) {
+    commands.spawn_bundle(PerspectiveCameraBundle::<FirstPassCamera> {
+        camera: Camera::default(),
+        transform: Transform::from_translation(Vec3::new(0.0, 0.0, 15.0))
+            .looking_at(Vec3::default(), Vec3::Y),
+        ..PerspectiveCameraBundle::new()
+    });
+}
+
+fn camera_system(cameras: Query<&Camera, With<FirstPassCamera>>) {
+    for camera in cameras.iter() {
+        // Do something with camera
+    }
+}
+```
+
+### [Remove the config api](https://github.com/bevyengine/bevy/pull/3633)
+
+```rs
+// 0.6
+struct Config(u32);
+
+fn local_config(local: Local<Config>) {
+    assert_eq!(*local.0, 42);
+}
+
+fn main() {
+        App::new()
+        .add_system(local_is_42.config(|params| params.0 = Some(Config(42))))
+        .run();
+}
+
+// 0.7
+struct Config(u32);
+
+fn local_config(local: u32) -> impl FnMut(ResMut<Config>) {
+    move |mut val| {
+        val.0 = local;
+
+        assert_eq!(val.0, 42);
+    }
+}
+
+fn main() {
+        App::new()
+        .add_system(local_config(Config(42)))
+        .run();
+}
+```
+
+### [Cameras now point at RenderTarget rather than Window](https://github.com/bevyengine/bevy/pull/3412)
+
+This change was made to support rendering to textures. Users working with multiple windows may be affected.
+
+```rs
+// 0.6
+commands.spawn_bundle(PerspectiveCameraBundle {
+    camera: Camera {
+        window: window_id,
+        ..Default::default()
+    },
+    ..Default::default()
+});
+
+// 0.7
+commands.spawn_bundle(PerspectiveCameraBundle {
+    camera: Camera {
+        target: RenderTarget::Window(window_id),
+        ..Default::default()
+    },
+    ..Default::default()
+});
+```
+
+### [Implement init_resource for Commands and World](https://github.com/bevyengine/bevy/pull/3079)
+
+```rs
+#[derive(Default)]
+struct Scoreboard {
+    current_score: u32,
+    high_score: u32,
+}
+
+// 0.6
+commands.insert_resource(Scoreboard::default());
+
+// 0.7
+commands.init_resource::<Scoreboard>();
+```
+
+### [Infallabile resource getters](https://github.com/bevyengine/bevy/pull/4047)
+
+```rs
+// 0.6
+let score = world.get_resource::<Score>().unwrap();
+
+// 0.7
+let score = world.resource::<Score>();
+```
+
+### [Event handling types are no longer re-exported from bevy_app](https://github.com/bevyengine/bevy/pull/4066)
+
+This only affects users who were importing these types directly from `bevy_app` and not through bevy's prelude.
+
+```rs
+// 0.6
+use bevy::app::{EventId, EventReader, EventWriter, Events, ManualEventReader};
+
+// 0.7
+use bevy::ecs::event::{EventId, EventReader, EventWriter, Events, ManualEventReader};
+```