Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

[Merged by Bors] - unsafeify World::entities_mut #4093

Closed
wants to merge 1 commit into from
Closed

[Merged by Bors] - unsafeify World::entities_mut #4093

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 7 additions & 1 deletion crates/bevy_ecs/src/entity/mod.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -199,7 +199,7 @@ impl<'a> core::iter::ExactSizeIterator for ReserveEntitiesIterator<'a> {}

#[derive(Debug, Default)]
pub struct Entities {
pub meta: Vec<EntityMeta>,
pub(crate) meta: Vec<EntityMeta>,

/// The `pending` and `free_cursor` fields describe three sets of Entity IDs
/// that have been freed or are in the process of being allocated:
Expand Down Expand Up @@ -544,6 +544,12 @@ impl Entities {
}
}

/// Accessor for getting the length of the vec in `self.meta`
#[inline]
pub fn meta_len(&self) -> usize {
self.meta.len()
}

#[inline]
pub fn len(&self) -> u32 {
self.len
Expand Down
6 changes: 5 additions & 1 deletion crates/bevy_ecs/src/world/mod.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -135,8 +135,12 @@ impl World {
}

/// Retrieves this world's [Entities] collection mutably
///
/// # Safety
/// Mutable reference must not be used to put the [`Entities`] data
/// in an invalid state for this [`World`]
#[inline]
pub fn entities_mut(&mut self) -> &mut Entities {
pub unsafe fn entities_mut(&mut self) -> &mut Entities {
&mut self.entities
}

Expand Down
4 changes: 2 additions & 2 deletions crates/bevy_render/src/lib.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -189,7 +189,7 @@ impl Plugin for RenderPlugin {

// reserve all existing app entities for use in render_app
// they can only be spawned using `get_or_spawn()`
let meta_len = app_world.entities().meta.len();
let meta_len = app_world.entities().meta_len();
render_app
.world
.entities()
Expand All @@ -198,7 +198,7 @@ impl Plugin for RenderPlugin {
// flushing as "invalid" ensures that app world entities aren't added as "empty archetype" entities by default
// these entities cannot be accessed without spawning directly onto them
// this _only_ works as expected because clear_entities() is called at the end of every frame.
render_app.world.entities_mut().flush_as_invalid();
unsafe { render_app.world.entities_mut() }.flush_as_invalid();
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Is there a way to avoid this entirely?

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

not sure, I dont particularly understand what the render app is actually trying to accomplish here 😅

Copy link
Member

@mockersf mockersf Mar 4, 2022 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

the render app "reserve" all the entities from the main app, but actually spawn something only on some of them. this marks all entities by default as invalid so that the one which won't be used aren't usable

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

The "right" way to do this would be to expose a safe mirror of flush_as_invalid() on World. But honestly this feature is niche enough that im fine leaving this as-is for now.

}

{
Expand Down