# Objective
I wanted to have reflection for BinaryHeap for a personal project.
I'm running into some issues:
- I wanted to represent BinaryHeap as a reflect::List type since it's
essentially a wrapper around a Vec, however there's no public way to
access the underlying Vec, which makes it hard to implement the
reflect::List methods. I have omitted the reflect::List methods for
now.. I'm not sure if that's a blocker?
- what would be the alternatives? Simply not implement `reflect::List`?
It is possible to implement `FromReflect` without it. Would the type be
`Struct` then?
---------
Co-authored-by: Charles Bournhonesque <cbournhonesque@snapchat.com>
# Objective
Provide component access to `&'w T`, `Ref<'w, T>`, `Mut<'w, T>`,
`Ptr<'w>` and `MutUntyped<'w>` from `EntityMut<'w>`/`EntityWorldMut<'w>`
with the world `'w` lifetime instead of `'_`.
Fixes#12417
## Solution
Add `into_` prefixed methods for `EntityMut<'w>`/`EntityWorldMut<'w>`
that consume `self` and returns component access with the world `'w`
lifetime unlike the `get_` prefixed methods that takes `&'a self` and
returns component access with `'a` lifetime.
Methods implemented:
- EntityMut::into_borrow
- EntityMut::into_ref
- EntityMut::into_mut
- EntityMut::into_borrow_by_id
- EntityMut::into_mut_by_id
- EntityWorldMut::into_borrow
- EntityWorldMut::into_ref
- EntityWorldMut::into_mut
- EntityWorldMut::into_borrow_by_id
- EntityWorldMut::into_mut_by_id
# Objective
The current example showcase site URLs have white-space and caps in them
which looks ugly as an URL.
Fixes https://github.com/bevyengine/bevy-website/issues/736
## Solution
To fix this the example showcase tool now makes the category used for
the site sections lowercase, separated by a hyphen rather than
white-space, and without parentheses.
---------
Co-authored-by: Rob Parrett <robparrett@gmail.com>
Co-authored-by: vero <email@atlasdostal.com>
# Objective
fix#12344
## Solution
use existing machinery in track_assets to determine if the asset is
unused before firing Asset::Unused event
~~most extract functions use `AssetEvent::Removed` to schedule deletion
of render world resources. `RenderAssetPlugin` was using
`AssetEvent::Unused` instead.
`Unused` fires when the last strong handle is dropped, even if a new one
is created. `Removed` only fires when a new one is not created.
as far as i can see, `Unused` is the same as `Removed` except for this
"feature", and that it also fires early if all handles for a loading
asset are dropped (`Removed` fires after the loading completes). note
that in that case, processing based on `Loaded` won't have been done
anyway.
i think we should get rid of `Unused` completely, it is not currently
used anywhere (except here, previously) and i think using it is probably
always a mistake.
i also am not sure why we keep loading assets that have been dropped
while loading, we should probably drop the loader task as well and
remove immediately.~~
# Objective
Whenever a nodes size gets changed, its texture slices get updated a
frame later. This results in visual glitches when animating the size of
a node with a texture slice. See this video:
[Screencast from 17-03-24
14:53:13.webm](https://github.com/bevyengine/bevy/assets/46689298/64e711f7-a1ec-41e3-b119-dc8d7e1a7669)
## Solution
Compute texture slices after the layout system has finished.
# Objective
- Resolves#12463
## Solution
- Added `ClampColor`
Due to consistency, `is_within_bounds` is a method of `ClampColor`, like
`is_fully_transparent` is a method of `Alpha`
---
## Changelog
### Added
- `ClampColor` trait
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
# Objective
It's useful to have access to render pipeline statistics, since they
provide more information than FPS alone. For example, the number of
drawn triangles can be used to debug culling and LODs. The number of
fragment shader invocations can provide a more stable alternative metric
than GPU elapsed time.
See also: Render node GPU timing overlay #8067, which doesn't provide
pipeline statistics, but adds a nice overlay.
## Solution
Add `RenderDiagnosticsPlugin`, which enables collecting pipeline
statistics and CPU & GPU timings.
---
## Changelog
- Add `RenderDiagnosticsPlugin`
- Add `RenderContext::diagnostic_recorder` method
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
# Objective
`QueryState::archetype_component_access` is only really ever used to
extend `SystemMeta`'s. It can be removed to save some memory for every
`Query` in an app.
## Solution
* Remove it.
* Have `new_archetype` pass in a `&mut Access<ArchetypeComponentId>`
instead and pull it from `SystemMeta` directly.
* Split `QueryState::new` from `QueryState::new_with_access` and a
common `QueryState::new_uninitialized`.
* Split `new_archetype` into an internal and public version. Call the
internal version in `update_archetypes`.
This should make it faster to construct new QueryStates, and by proxy
lenses and joins as well.
`matched_tables` also similarly is only used to deduplicate inserting
into `matched_table_ids`. If we can find another efficient way to do so,
it might also be worth removing.
The [generated
assembly](https://github.com/james7132/bevy_asm_tests/compare/main...remove-query-state-archetype-component-access#diff-496530101f0b16e495b7e9b77c0e906ae3068c8adb69ed36c92d5a1be5a9efbe)
reflects this well, with all of the access related updates in
`QueryState` being removed.
---
## Changelog
Removed: `QueryState::archetype_component_access`.
Changed: `QueryState::new_archetype` now takes a `&mut
Access<ArchetypeComponentId>` argument, which will be updated with the
new accesses.
Changed: `QueryState::update_archetype_component_access` now takes a
`&mut Access<ArchetypeComponentId>` argument, which will be updated with
the new accesses.
## Migration Guide
TODO
# Objective
Improve code quality involving fixedbitset.
## Solution
Update to fixedbitset 0.5. Use the new `grow_and_insert` function
instead of `grow` and `insert` functions separately.
This should also speed up most of the set operations involving
fixedbitset. They should be ~2x faster, but testing this against the
stress tests seems to show little to no difference. The multithreaded
executor doesn't seem to be all that much faster in many_cubes and
many_foxes. These use cases are likely dominated by other operations or
the bitsets aren't big enough to make them the bottleneck.
This introduces a duplicate dependency due to petgraph and wgpu, but the
former may take some time to update.
## Changelog
Removed: `Access::grow`
## Migration Guide
`Access::grow` has been removed. It's no longer needed. Remove all
references to it.
# Objective
- Make example alien_cake_addict deterministic so that it's easier to
check for regression
## Solution
- Use a seeded random
---------
Co-authored-by: Rob Parrett <robparrett@gmail.com>
# Objective
Make `Transform` APIs more ergonomic by allowing users to pass `Dir3` as
an argument where a direction is needed. Fixes#12481.
## Solution
Accept `impl TryInto<Dir3>` instead of `Vec3` for direction/axis
arguments in `Transform` APIs
---
## Changelog
The following `Transform` methods now accept an `impl TryInto<Dir3>`
argument where they previously accepted directions as `Vec3`:
* `Transform::{look_to,looking_to}`
* `Transform::{look_at,looking_at}`
* `Transform::{align,aligned_by}`
## Migration Guide
This is not a breaking change since the arguments were previously `Vec3`
which already implements `TryInto<Dir3>`, and behavior is unchanged.
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
Co-authored-by: IQuick 143 <IQuick143cz@gmail.com>
# Objective
- Even if we have `Laba` and `Oklcha` colorspaces using lightness as the
L field name, `Oklaba` doesn't do the same
- The shorthand function for creating a new color should be named
`Oklaba::lab`, but is named `lch`
## Solution
- Rename field l in `Oklaba` to lightness
- Rename `Oklaba::lch` to `Oklaba::lab`
---
## Changelog
### Changed
- Changed name in l field in `Oklaba` to lightness
- Changed method name `Oklaba::lch` to `Oklaba::lab`
## Migration Guide
If you were creating a Oklaba instance directly, instead of using L, you
should use lightness
```rust
// Before
let oklaba = Oklaba { l: 1., ..Default::default() };
// Now
let oklaba = Oklaba { lightness: 1., ..Default::default() };
```
if you were using the function `Oklaba::lch`, now the method is named
`Oklaba::lab`
# Objective
Give easy methods for uniform point sampling in a variety of primitive
shapes (particularly useful for circles and spheres) because in a lot of
cases its quite easy to get wrong (non-uniform).
## Solution
Added the `ShapeSample` trait to `bevy_math` and implemented it for
`Circle`, `Sphere`, `Rectangle`, `Cuboid`, `Cylinder`, `Capsule2d` and
`Capsule3d`. There are a few other shapes it would be reasonable to
implement for like `Triangle`, `Ellipse` and `Torus` but I'm not
immediately sure how these would be implemented (other than rejection
which could be the best method, and could be more performant than some
of the solutions in this pr I'm not sure). This exposes the
`sample_volume` and `sample_surface` methods to get both a random point
from its interior or its surface. EDIT: Renamed `sample_volume` to
`sample_interior` and `sample_surface` to `sample_boundary`
This brings in `rand` as a default optional dependency (without default
features), and the methods take `&mut impl Rng` which allows them to use
any random source implementing `RngCore`.
---
## Changelog
### Added
Added the methods `sample_interior` and `sample_boundary` to a variety
of primitive shapes providing easy uniform point sampling.
# Objective
assets that don't load before they get removed are retried forever,
causing buffer churn and slowdown.
## Solution
stop trying to prepare dead assets.
# Objective
The `example-showcase` command is failing to run.
```
cargo run --release -p example-showcase -- run --screenshot --in-ci
Updating crates.io index
Compiling example-showcase v0.14.0-dev (/Users/robparrett/src/bevy/tools/example-showcase)
Finished release [optimized] target(s) in 2.59s
Running `target/release/example-showcase run --screenshot --in-ci`
$ git apply --ignore-whitespace tools/example-showcase/remove-desktop-app-mode.patch
error: patch failed: crates/bevy_winit/src/winit_config.rs:29
error: crates/bevy_winit/src/winit_config.rs: patch does not apply
thread 'main' panicked at tools/example-showcase/src/main.rs:203:18:
called `Result::unwrap()` on an `Err` value: command exited with non-zero code `git apply --ignore-whitespace tools/example-showcase/remove-desktop-app-mode.patch`: 1
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
## Solution
Update `remove-desktop-app-mode.patch`.
# Objective
Originally proposed as part of #8973. Adds `with_` methods for each side
of `UiRect`
## Solution
Add `with_left`, `with_right`, `with_top`, `with_bottom` to `UiRect`.
# Objective
Add reflect for `std::any::TypeId`.
I couldn't add ReflectSerialize/ReflectDeserialize for it, it was giving
me an error. I don't really understand why, since it works for
`std::path::PathBuf`.
Co-authored-by: Charles Bournhonesque <cbournhonesque@snapchat.com>
# Objective
Fixes#12480
by removing the explicit mention of equally sized triangles from the doc
for icospheres
Co-authored-by: Emi <emanuel.boehm@gmail.com>
# Objective
- in example `axes`, the axes are sometime one frame late to follow
their mesh
## Solution
- System `move_cubes` modify the transforms, and `draw_axes` query them
for the axes
- if their order is not specified, it will be random and sometimes axes
are drawn before transforms are updated
- order systems
# Objective
- Improve the code quality of the breakout example
- As a newcomer to `bevy` I was pointed to the breakout example after
the "Getting Started" tutorial
- I'm making this PR because it had a few wrong comments + some
inconsistency in used patterns
## Solution
- Remove references to `wall` in all the collision code as it also
handles bricks and the paddle
- Use the newtype pattern with `bevy::prelude::Deref` for resources
- It was already used for `Velocity` before this PR
- `Scoreboard` is a resource only containing `score`, so it's simpler as
a newtype `Score` resource
- `CollisionSound` is already a newtype, so might as well unify the
access pattern for it
- Added docstrings for `WallLocation::position` and `WallLocation::size`
to explain what they represent
# Objective
Fixes#12139
## Solution
- Derive `Debug` impl for `Entity`
- Add impl `Display` for `Entity`
- Add `entity_display` test to check the output contains all required
info
I decided to go with `0v0|1234` format as opposed to the `0v0[1234]`
which was initially discussed in the issue.
My rationale for this is that `[1234]` may be confused for index values,
which may be common in logs, and so searching for entities by text would
become harder. I figured `|1234` would help the entity IDs stand out
more.
Additionally, I'm a little concerned that this change is gonna break
existing logging for projects because `Debug` is now going to be a
multi-line output. But maybe this is ok.
We could implement `Debug` to be a single-line output, but then I don't
see why it would be different from `Display` at all.
@alice-i-cecile Let me know if we'd like to make any changes based on
these points.
# Objective
- Closes#11793
- Introduces a general API for aligning local coordinates of Transforms
with given vectors.
## Solution
- We introduce `Transform::align`, which allows a rotation to be
specified by four pieces of alignment data, as explained by the
documentation:
````rust
/// Rotates this [`Transform`] so that the `main_axis` vector, reinterpreted in local coordinates, points
/// in the given `main_direction`, while `secondary_axis` points towards `secondary_direction`.
///
/// For example, if a spaceship model has its nose pointing in the X-direction in its own local coordinates
/// and its dorsal fin pointing in the Y-direction, then `align(Vec3::X, v, Vec3::Y, w)` will make the spaceship's
/// nose point in the direction of `v`, while the dorsal fin does its best to point in the direction `w`.
///
/// More precisely, the [`Transform::rotation`] produced will be such that:
/// * applying it to `main_axis` results in `main_direction`
/// * applying it to `secondary_axis` produces a vector that lies in the half-plane generated by `main_direction` and
/// `secondary_direction` (with positive contribution by `secondary_direction`)
///
/// [`Transform::look_to`] is recovered, for instance, when `main_axis` is `Vec3::NEG_Z` (the [`Transform::forward`]
/// direction in the default orientation) and `secondary_axis` is `Vec3::Y` (the [`Transform::up`] direction in the default
/// orientation). (Failure cases may differ somewhat.)
///
/// In some cases a rotation cannot be constructed. Another axis will be picked in those cases:
/// * if `main_axis` or `main_direction` is zero, `Vec3::X` takes its place
/// * if `secondary_axis` or `secondary_direction` is zero, `Vec3::Y` takes its place
/// * if `main_axis` is parallel with `secondary_axis` or `main_direction` is parallel with `secondary_direction`,
/// a rotation is constructed which takes `main_axis` to `main_direction` along a great circle, ignoring the secondary
/// counterparts
///
/// Example
/// ```
/// # use bevy_math::{Vec3, Quat};
/// # use bevy_transform::components::Transform;
/// let mut t1 = Transform::IDENTITY;
/// let mut t2 = Transform::IDENTITY;
/// t1.align(Vec3::ZERO, Vec3::Z, Vec3::ZERO, Vec3::X);
/// t2.align(Vec3::X, Vec3::Z, Vec3::Y, Vec3::X);
/// assert_eq!(t1.rotation, t2.rotation);
///
/// t1.align(Vec3::X, Vec3::Z, Vec3::X, Vec3::Y);
/// assert_eq!(t1.rotation, Quat::from_rotation_arc(Vec3::X, Vec3::Z));
/// ```
pub fn align(
&mut self,
main_axis: Vec3,
main_direction: Vec3,
secondary_axis: Vec3,
secondary_direction: Vec3,
) { //... }
````
- We introduce `Transform::aligned_by`, the returning-Self version of
`align`:
````rust
pub fn aligned_by(
mut self,
main_axis: Vec3,
main_direction: Vec3,
secondary_axis: Vec3,
secondary_direction: Vec3,
) -> Self { //... }
````
- We introduce an example (examples/transforms/align.rs) that shows the
usage of this API. It is likely to be mathier than most other
`Transform` APIs, so when run, the example demonstrates what the API
does in space:
<img width="1440" alt="Screenshot 2024-03-12 at 11 01 19 AM"
src="https://github.com/bevyengine/bevy/assets/2975848/884b3cc3-cbd9-48ae-8f8c-49a677c59dfe">
---
## Changelog
- Added methods `align`, `aligned_by` to `Transform`.
- Added transforms/align.rs to examples.
---
## Discussion
### On the form of `align`
The original issue linked above suggests an API similar to that of the
existing `Transform::look_to` method:
````rust
pub fn align_to(&mut self, direction: Vec3, up: Vec3) { //... }
````
Not allowing an input axis of some sort that is to be aligned with
`direction` would not really solve the problem in the issue, since the
user could easily be in a scenario where they have to compose with
another rotation on their own (undesirable). This leads to something
like:
````rust
pub fn align_to(&mut self, axis: Vec3, direction: Vec3, up: Vec3) { //... }
````
However, this still has two problems:
- If the vector that the user wants to align is parallel to the Y-axis,
then the API basically does not work (we cannot fully specify a
rotation)
- More generally, it does not give the user the freedom to specify which
direction is to be treated as the local "up" direction, so it fails as a
general alignment API
Specifying both leads us to the present situation, with two local axis
inputs (`main_axis` and `secondary_axis`) and two target directions
(`main_direction` and `secondary_direction`). This might seem a little
cumbersome for general use, but for the time being I stand by the
decision not to expand further without prompting from users. I'll expand
on this below.
### Additional APIs?
Presently, this PR introduces only `align` and `aligned_by`. Other
potentially useful bundles of API surface arrange into a few different
categories:
1. Inferring direction from position, a la `Transform::look_at`, which
might look something like this:
````rust
pub fn align_at(&mut self, axis: Vec3, target: Vec3, up: Vec3) {
self.align(axis, target - self.translation, Vec3::Y, up);
}
````
(This is simple but still runs into issues when the user wants to point
the local Y-axis somewhere.)
2. Filling in some data for the user for common use-cases; e.g.:
````rust
pub fn align_x(&mut self, direction: Vec3, up: Vec3) {
self.align(Vec3::X, direction, Vec3::Y, up);
}
````
(Here, use of the `up` vector doesn't lose any generality, but it might
be less convenient to specify than something else. This does naturally
leave open the question of what `align_y` would look like if we provided
it.)
Morally speaking, I do think that the `up` business is more pertinent
when the intention is to work with cameras, which the `look_at` and
`look_to` APIs seem to cover pretty well. If that's the case, then I'm
not sure what the ideal shape for these API functions would be, since it
seems like a lot of input would have to be baked into the function
definitions. For some cases, this might not be the end of the world:
````rust
pub fn align_x_z(&mut self, direction: Vec3, weak_direction: Vec3) {
self.align(Vec3::X, direction, Vec3::Z, weak_direction);
}
````
(However, this is not symmetrical in x and z, so you'd still need six
API functions just to support the standard positive coordinate axes, and
if you support negative axes then things really start to balloon.)
The reasons that these are not actually produced in this PR are as
follows:
1. Without prompting from actual users in the wild, it is unknown to me
whether these additional APIs would actually see a lot of use. Extending
these to our users in the future would be trivial if we see there is a
demand for something specific from the above-mentioned categories.
2. As discussed above, there are so many permutations of these that
could be provided that trying to do so looks like it risks unduly
ballooning the API surface for this feature.
3. Finally, and most importantly, creating these helper functions in
user-space is trivial, since they all just involve specializing `align`
to particular inputs; e.g.:
````rust
fn align_ship(ship_transform: &mut Transform, nose_direction: Vec3, dorsal_direction: Vec3) {
ship_transform.align(Ship::NOSE, nose_direction, Ship::DORSAL, dorsal_direction);
}
````
With that in mind, I would prefer instead to focus on making the
documentation and examples for a thin API as clear as possible, so that
users can get a grip on the tool and specialize it for their own needs
when they feel the desire to do so.
### `Dir3`?
As in the case of `Transform::look_to` and `Transform::look_at`, the
inputs to this function are, morally speaking, *directions* rather than
vectors (actually, if we're being pedantic, the input is *really really*
a pair of orthonormal frames), so it's worth asking whether we should
really be using `Dir3` as inputs instead of `Vec3`. I opted for `Vec3`
for the following reasons:
1. Specifying a `Dir3` in user-space is just more annoying than
providing a `Vec3`. Even in the most basic cases (e.g. providing a
vector literal), you still have to do error handling or call an unsafe
unwrap in your function invocations.
2. The existing API mentioned above uses `Vec3`, so we are just adhering
to the same thing.
Of course, the use of `Vec3` has its own downsides; it can be argued
that the replacement of zero-vectors with fixed ones (which we do in
`Transform::align` as well as `Transform::look_to`) more-or-less amounts
to failing silently.
### Future steps
The question of additional APIs was addressed above. For me, the main
thing here to handle more immediately is actually just upstreaming this
API (or something similar and slightly mathier) to `glam::Quat`. The
reason that this would be desirable for users is that this API currently
only works with `Transform`s even though all it's actually doing is
specifying a rotation. Upstreaming to `glam::Quat`, properly done, could
buy a lot basically for free, since a number of `Transform` methods take
a rotation as an input. Using these together would require a little bit
of mathematical savvy, but it opens up some good things (e.g.
`Transform::rotate_around`).
# Objective
- Addresses #12462
- When we serialize an enum, deserialize it, then reserialize it, the
correct variant should be selected.
## Solution
- Change `dynamic_enum.set_variant` to
`dynamic_enum.set_variant_with_index` in `EnumVisitor`
# Objective
- Adds 3d grids, suggestion of #9400
## Solution
- Added 3d grids (grids spanning all three dimensions, not flat grids)
to bevy_gizmos
---
## Changelog
- `gizmos.grid(...)` and `gizmos.grid_2d(...)` now return a
`GridBuilder2d`.
- Added `gizmos.grid_3d(...)` which returns a `GridBuilder3d`.
- The difference between them is basically only that `GridBuilder3d`
exposes some methods for configuring the z axis while the 2d version
doesn't.
- Allowed for drawing the outer edges along a specific axis by calling
`.outer_edges_x()`, etc. on the builder.
## Additional information
Please note that I have not added the 3d grid to any example as not to
clutter them.
Here is an image of what the 3d grid looks like:
<img width="1440" alt="Screenshot 2024-03-12 at 02 19 55"
src="https://github.com/bevyengine/bevy/assets/62256001/4cd3b7de-cf2c-4f05-8a79-920a4dd804b8">
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
# Objective
Scaling `z` by anything but `1.0` in 2d can only lead to bugs and
confusion. See #4149.
## Solution
Use a `Vec2` for the paddle size const, and add a scale of `1.0` later.
This matches the way `BRICK_SIZE` is defined.
# Objective
Beginning of refactoring of light.rs in bevy_pbr, as per issue #12349
Create and move light.rs to its own directory, and extract AmbientLight
struct.
## Solution
- moved light.rs to light/mod.rs
- extracted AmbientLight struct to light/ambient_light.rs
# Objective
Fixes#12064
## Solution
Prior to #11326, the "global physical" translation of text was rounded.
After #11326, only the "offset" is being rounded.
This moves things around so that the "global translation" is converted
to physical pixels, rounded, and then converted back to logical pixels,
which is what I believe was happening before / what the comments above
describe.
## Discussion
This seems to work and fix an obvious mistake in some code, but I don't
fully grok the ui / text pipelines / math here.
## Before / After and test example
<details>
<summary>Expand Code</summary>
```rust
use std::f32::consts::FRAC_PI_2;
use bevy::prelude::*;
use bevy_internal:🪟:WindowResolution;
const FONT_SIZE: f32 = 25.0;
const PADDING: f32 = 5.0;
fn main() {
App::new()
.add_plugins(
DefaultPlugins.set(WindowPlugin {
primary_window: Some(Window {
resolution: WindowResolution::default().with_scale_factor_override(1.0),
..default()
}),
..default()
}),
//.set(ImagePlugin::default_nearest()),
)
.add_systems(Startup, setup)
.run();
}
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
commands.spawn(Camera2dBundle::default());
let font = asset_server.load("fonts/FiraSans-Bold.ttf");
for x in [20.5, 140.0] {
for i in 1..10 {
text(
&mut commands,
font.clone(),
x,
(FONT_SIZE + PADDING) * i as f32,
i,
Quat::default(),
1.0,
);
}
}
for x in [450.5, 700.0] {
for i in 1..10 {
text(
&mut commands,
font.clone(),
x,
((FONT_SIZE * 2.0) + PADDING) * i as f32,
i,
Quat::default(),
2.0,
);
}
}
for y in [400.0, 600.0] {
for i in 1..10 {
text(
&mut commands,
font.clone(),
(FONT_SIZE + PADDING) * i as f32,
y,
i,
Quat::from_rotation_z(FRAC_PI_2),
1.0,
);
}
}
}
fn text(
commands: &mut Commands,
font: Handle<Font>,
x: f32,
y: f32,
i: usize,
rot: Quat,
scale: f32,
) {
let text = (65..(65 + i)).map(|a| a as u8 as char).collect::<String>();
commands.spawn(TextBundle {
style: Style {
position_type: PositionType::Absolute,
left: Val::Px(x),
top: Val::Px(y),
..default()
},
text: Text::from_section(
text,
TextStyle {
font,
font_size: FONT_SIZE,
..default()
},
),
transform: Transform::from_rotation(rot).with_scale(Vec2::splat(scale).extend(1.)),
..default()
});
}
```
</details>
Open both images in new tabs and swap back and forth. Pay attention to
the "A" and "ABCD" lines.
<details>
<summary>Before</summary>
<img width="640" alt="main3"
src="https://github.com/bevyengine/bevy/assets/200550/248d7a55-d06d-433f-80da-1914803c3551">
</details>
<details>
<summary>After</summary>
<img width="640" alt="pr3"
src="https://github.com/bevyengine/bevy/assets/200550/26a9d292-07ae-4af3-b035-e187b2529ace">
</details>
---------
Co-authored-by: François Mockers <mockersf@gmail.com>
# Objective
`System<f32>` currently does not implement `Eq` even though it should
## Solution
Manually implement `Eq` like other traits are manually implemented
# Objective
- no-longer-extant type `WinitConfig` referenced in comments
- `mouse_button_input` refers to `KeyCode` input
- "spacebar" flagged as a typo by RustRover IDE
## Solution
- replace `WinitConfig` with `WinitSettings` in comments
- rename `mouse_button_input` to just `button_input`
- change "spacebar" to "space bar"
# Objective
To have a user level workaround for #12237.
## Solution
Workaround to the problem is described in:
https://github.com/bevyengine/bevy/issues/12237#issuecomment-1983680632
## Changelog
### Changed
- `CreateWindowParams` type and `create_windows` system from
`bevy_winit` is now public, which allows library authors and game
developers to manually trigger window creation when needed.
# Objective
Fixes#12301. Provide more comprehensive crate level docs for bevy_ptr,
explaining it's methodology and design.
## Solution
Write out said docs.
---------
Co-authored-by: BD103 <59022059+BD103@users.noreply.github.com>
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
# Objective
- Reduce allocations on the UI hot path.
## Solution
- Cache buffers used by the `ui_stack_system`.
## Follow-Up
- `sort_by_key` is potentially-allocating. It might be worthwhile to
include the child index as part of the sort-key and use unstable sort.
# Objective
- Closes#11954
## Solution
Change the load_meshes field in `GltfLoaderSettings` from a bool to
`RenderAssetUsages` flag, and add a new load_materials flag.
Use these to determine where the gLTF mesh and material assets are
retained in memory (if the provided flags are empty, then the assets are
skipped during load).
---
## Migration Guide
When loading gLTF assets with `asset_server.load_with_settings`, use
`RenderAssetUsages` instead of `bool` when setting load_meshes e.g.
```rust
let _ = asset_server.load_with_settings("...", |s: &mut GltfLoaderSettings| {
s.load_meshes = RenderAssetUsages::RENDER_WORLD;
});
```
Use the new load_materials field for controlling material load &
retention behaviour instead of load_meshes.
gLTF .meta files need similar updates e.g
```
load_meshes: true,
```
to
```
load_meshes: ("MAIN_WORLD | RENDER_WORLD"),
```
---------
Co-authored-by: 66OJ66 <hi0obxud@anonaddy.me>
# Objective
Add a `scale_around_center` method to the `BoundingVolume` trait, as per
#12130.
## Solution
Added `scale_around_center` to the `BoundingVolume` trait, implemented
in `Aabb2d`, `Aabb3d`, `BoundingCircle`, and `BoundingSphere` (with
tests).
# Objective
- Fix GamepadEvent::Connection not being sent for devices connected at
startup.
## Solution
- GamepadConnectionEvent was being sent directly for gamepads connected
at startup, which causes consumers of GamepadEvent to not receive those
events.
- Instead send GamepadEvent. The gamepad_event_system splits
GamepadEvent up, so consumers of GamepadConnectionEvent will still
receive the events.
# Objective
- Part of #12351
- Add fps overlay
## Solution
- Create `FpsOverlayPlugin`
- Allow for configuration through resource `FpsOverlayConfig`
- Allow for configuration during runtime
### Preview on default settings
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
# Objective
- Adds gizmo line joints, suggestion of #9400
## Solution
- Adds `line_joints: GizmoLineJoint` to `GizmoConfig`. Currently the
following values are supported:
- `GizmoLineJoint::None`: does not draw line joints, same behaviour as
previously
- `GizmoLineJoint::Bevel`: draws a single triangle between the lines
- `GizmoLineJoint::Miter` / 'spiky joints': draws two triangles between
the lines extending them until they meet at a (miter) point.
- NOTE: for very small angles between the lines, which happens
frequently in 3d, the miter point will be very far away from the point
at which the lines meet.
- `GizmoLineJoint::Round(resolution)`: Draw a circle arc between the
lines. The circle is a triangle fan of `resolution` triangles.
---
## Changelog
- Added `GizmoLineJoint`, use that in `GizmoConfig` and added necessary
pipelines and draw commands.
- Added a new `line_joints.wgsl` shader containing three vertex shaders
`vertex_bevel`, `vertex_miter` and `vertex_round` as well as a basic
`fragment` shader.
## Migration Guide
Any manually created `GizmoConfig`s must now set the `.line_joints`
field.
## Known issues
- The way we currently create basic closed shapes like rectangles,
circles, triangles or really any closed 2d shape means that one of the
corners will not be drawn with joints, although that would probably be
expected. (see the triangle in the 2d image)
- This could be somewhat mitigated by introducing line caps or fixed by
adding another segment overlapping the first of the strip. (Maybe in a
followup PR?)
- 3d shapes can look 'off' with line joints (especially bevel) because
wherever 3 or more lines meet one of them may stick out beyond the joint
drawn between the other 2.
- Adding additional lines so that there is a joint between every line at
a corner would fix this but would probably be too computationally
expensive.
- Miter joints are 'unreasonably long' for very small angles between the
lines (the angle is the angle between the lines in screen space). This
is technically correct but distracting and does not feel right,
especially in 3d contexts. I think limiting the length of the miter to
the point at which the lines meet might be a good idea.
- The joints may be drawn with a different gizmo in-between them and
their corresponding lines in 2d. Some sort of z-ordering would probably
be good here, but I believe this may be out of scope for this PR.
## Additional information
Some pretty images :)
<img width="1175" alt="Screenshot 2024-03-02 at 04 53 50"
src="https://github.com/bevyengine/bevy/assets/62256001/58df7e63-9376-4430-8871-32adba0cb53b">
- Note that the top vertex does not have a joint drawn.
<img width="1440" alt="Screenshot 2024-03-02 at 05 03 55"
src="https://github.com/bevyengine/bevy/assets/62256001/137a00cf-cbd4-48c2-a46f-4b47492d4fd9">
Now for a weird video:
https://github.com/bevyengine/bevy/assets/62256001/93026f48-f1d6-46fe-9163-5ab548a3fce4
- The black lines shooting out from the cube are miter joints that get
very long because the lines between which they are drawn are (almost)
collinear in screen space.
---------
Co-authored-by: Pablo Reinhardt <126117294+pablo-lua@users.noreply.github.com>
# Objective
Rotating vectors is a very common task. It is required for a variety of
things both within Bevy itself and in many third party plugins, for
example all over physics and collision detection, and for things like
Bevy's bounding volumes and several gizmo implementations.
For 3D, we can do this using a `Quat`, but for 2D, we do not have a
clear and efficient option. `Mat2` can be used for rotating vectors if
created using `Mat2::from_angle`, but this is not obvious to many users,
it doesn't have many rotation helpers, and the type does not give any
guarantees that it represents a valid rotation.
We should have a proper type for 2D rotations. In addition to allowing
for potential optimization, it would allow us to have a consistent and
explicitly documented representation used throughout the engine, i.e.
counterclockwise and in radians.
## Representation
The mathematical formula for rotating a 2D vector is the following:
```
new_x = x * cos - y * sin
new_y = x * sin + y * cos
```
Here, `sin` and `cos` are the sine and cosine of the rotation angle.
Computing these every time when a vector needs to be rotated can be
expensive, so the rotation shouldn't be just an `f32` angle. Instead, it
is often more efficient to represent the rotation using the sine and
cosine of the angle instead of storing the angle itself. This can be
freely passed around and reused without unnecessary computations.
The two options are either a 2x2 rotation matrix or a unit complex
number where the cosine is the real part and the sine is the imaginary
part. These are equivalent for the most part, but the unit complex
representation is a bit more memory efficient (two `f32`s instead of
four), so I chose that. This is like Nalgebra's
[`UnitComplex`](https://docs.rs/nalgebra/latest/nalgebra/geometry/type.UnitComplex.html)
type, which can be used for the
[`Rotation2`](https://docs.rs/nalgebra/latest/nalgebra/geometry/type.Rotation2.html)
type.
## Implementation
Add a `Rotation2d` type represented as a unit complex number:
```rust
/// A counterclockwise 2D rotation in radians.
///
/// The rotation angle is wrapped to be within the `]-pi, pi]` range.
pub struct Rotation2d {
/// The cosine of the rotation angle in radians.
///
/// This is the real part of the unit complex number representing the rotation.
pub cos: f32,
/// The sine of the rotation angle in radians.
///
/// This is the imaginary part of the unit complex number representing the rotation.
pub sin: f32,
}
```
Using it is similar to using `Quat`, but in 2D:
```rust
let rotation = Rotation2d::radians(PI / 2.0);
// Rotate vector (also works on Direction2d!)
assert_eq!(rotation * Vec2::X, Vec2::Y);
// Get angle as degrees
assert_eq!(rotation.as_degrees(), 90.0);
// Getting sin and cos is free
let (sin, cos) = rotation.sin_cos();
// "Subtract" rotations
let rotation2 = Rotation2d::FRAC_PI_4; // there are constants!
let diff = rotation * rotation2.inverse();
assert_eq!(diff.as_radians(), PI / 4.0);
// This is equivalent to the above
assert_eq!(rotation2.angle_between(rotation), PI / 4.0);
// Lerp
let rotation1 = Rotation2d::IDENTITY;
let rotation2 = Rotation2d::FRAC_PI_2;
let result = rotation1.lerp(rotation2, 0.5);
assert_eq!(result.as_radians(), std::f32::consts::FRAC_PI_4);
// Slerp
let rotation1 = Rotation2d::FRAC_PI_4);
let rotation2 = Rotation2d::degrees(-180.0); // we can use degrees too!
let result = rotation1.slerp(rotation2, 1.0 / 3.0);
assert_eq!(result.as_radians(), std::f32::consts::FRAC_PI_2);
```
There's also a `From<f32>` implementation for `Rotation2d`, which means
that methods can still accept radians as floats if the argument uses
`impl Into<Rotation2d>`. This means that adding `Rotation2d` shouldn't
even be a breaking change.
---
## Changelog
- Added `Rotation2d`
- Bounding volume methods now take an `impl Into<Rotation2d>`
- Gizmo methods with rotation now take an `impl Into<Rotation2d>`
## Future use cases
- Collision detection (a type like this is quite essential considering
how common vector rotations are)
- `Transform` helpers (e.g. return a 2D rotation about the Z axis from a
`Transform`)
- The rotation used for `Transform2d` (#8268)
- More gizmos, maybe meshes... everything in 2D that uses rotation
---------
Co-authored-by: Tristan Guichaoua <33934311+tguichaoua@users.noreply.github.com>
Co-authored-by: Robert Walter <robwalter96@gmail.com>
Co-authored-by: IQuick 143 <IQuick143cz@gmail.com>
