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on: [push, pull_request]
name: Continuous integration
jobs:
check:
name: Check
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- uses: actions-rs/toolchain@v1
with:
profile: minimal
toolchain: stable
override: true
- uses: actions-rs/cargo@v1
with:
command: check
test:
name: Test Suite
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- uses: actions-rs/toolchain@v1
with:
profile: minimal
toolchain: stable
override: true
- uses: actions-rs/cargo@v1
with:
command: test
fmt:
name: Rustfmt
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- uses: actions-rs/toolchain@v1
with:
profile: minimal
toolchain: stable
override: true
- run: rustup component add rustfmt
- uses: actions-rs/cargo@v1
with:
command: fmt
args: --all -- --check
clippy:
name: Clippy
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- uses: actions-rs/toolchain@v1
with:
profile: minimal
toolchain: stable
override: true
- run: rustup component add clippy
- uses: actions-rs/cargo@v1
with:
command: clippy
args: -- -D warnings

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/target
/Cargo.lock

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[package]
name = "bevy_mod_outline"
version = "0.1.0"
edition = "2021"
license = "MIT OR Apache-2.0"
description = "A mesh outlining plugin for Bevy."
readme = "README.md"
homepage = "https://github.com/komadori/bevy_mod_outline/"
repository = "https://github.com/komadori/bevy_mod_outline/"
keywords = ["gamedev", "bevy", "outline"]
categories = ["game-engines", "rendering"]
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
bevy = { version = "0.7", default-features = false, features = [
"render",
] }
bevy_asset = { version = "0.7", default-features = false }
[dev-dependencies]
bevy = { version = "0.7", default-features = false, features = [
"bevy_winit",
"x11",
] }
bevy_mod_rounded_box = "0.1"
[[example]]
name = "cube"
path = "examples/cube.rs"

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# bevy_mod_outline
This crate provides a plugin for drawing outlines around meshes.
## Dependency
```toml
[dependencies]
bevy_mod_outline = "0.1"
```
## Example
A rotating rounded cube with an outline.
```shell
cargo run --example cube
```
## Versions
| This Version | Bevy version |
|--------------|--------------|
| 0.1.x | 0.7.x |

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use std::f32::consts::TAU;
use bevy::prelude::*;
use bevy_mod_outline::*;
use bevy_mod_rounded_box::*;
#[bevy_main]
fn main() {
App::new()
.insert_resource(Msaa { samples: 4 })
.add_plugins(DefaultPlugins)
.add_plugin(OutlinePlugin)
.add_startup_system(setup)
.add_system(rotate_cube)
.run();
}
#[derive(Component)]
struct TheCube();
fn setup(
mut commands: Commands,
mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<StandardMaterial>>,
) {
// Spawn cube et al.
commands.spawn_bundle(PbrBundle {
mesh: meshes.add(Mesh::from(bevy::prelude::shape::Plane { size: 5.0 })),
material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
..default()
});
commands
.spawn_bundle(PbrBundle {
mesh: meshes.add(Mesh::from(RoundedBox {
size: Vec3::new(1., 1., 1.),
radius: 0.3,
subdivisions: 3,
})),
material: materials.add(Color::rgb(0.1, 0.1, 0.9).into()),
transform: Transform::from_xyz(0.0, 1.0, 0.0),
..default()
})
.insert(Outline {
colour: Color::rgb(1.0, 0.0, 0.0),
offset: 1.0,
})
.insert(TheCube());
commands.spawn_bundle(PointLightBundle {
point_light: PointLight {
intensity: 1500.0,
shadows_enabled: true,
..default()
},
transform: Transform::from_xyz(4.0, 8.0, 4.0),
..default()
});
commands.spawn_bundle(PerspectiveCameraBundle {
transform: Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
..default()
});
}
fn rotate_cube(
mut cubes: Query<&mut Transform, With<TheCube>>,
timer: Res<Time>,
mut t: Local<f32>,
) {
let ta = *t;
*t = (ta + 0.5 * timer.delta_seconds()) % TAU;
let tb = *t;
let i1 = tb.cos() - ta.cos();
let i2 = ta.sin() - tb.sin();
for mut transform in cubes.iter_mut() {
transform.rotate(Quat::from_rotation_z(
TAU * 20.0 * i1 * timer.delta_seconds(),
));
transform.rotate(Quat::from_rotation_y(
TAU * 20.0 * i2 * timer.delta_seconds(),
));
}
}

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use bevy::asset::load_internal_asset;
use bevy::core_pipeline::Transparent3d;
use bevy::pbr::{
DrawMesh, MeshPipeline, MeshPipelineKey, MeshUniform, SetMeshBindGroup, SetMeshViewBindGroup,
};
use bevy::prelude::*;
use bevy::reflect::TypeUuid;
use bevy::render::mesh::{MeshVertexBufferLayout, PrimitiveTopology};
use bevy::render::render_asset::RenderAssets;
use bevy::render::render_phase::{AddRenderCommand, DrawFunctions, RenderPhase, SetItemPipeline};
use bevy::render::render_resource::{
Face, PipelineCache, RenderPipelineDescriptor, SpecializedMeshPipeline,
SpecializedMeshPipelineError, SpecializedMeshPipelines,
};
use bevy::render::view::ExtractedView;
use bevy::render::{RenderApp, RenderStage};
pub const OUTLINE_SHADER_HANDLE: HandleUntyped =
HandleUntyped::weak_from_u64(Shader::TYPE_UUID, 2101625026478770097);
#[derive(Clone, Component)]
pub struct Outline {
pub colour: Color,
pub offset: f32,
}
pub struct OutlinePlugin;
fn extract_outline(
mut commands: Commands,
mut previous_len: Local<usize>,
mut query: Query<(Entity, &Outline)>,
) {
let mut values = Vec::with_capacity(*previous_len);
for (entity, outline) in query.iter_mut() {
values.push((entity, (outline.clone(),)));
}
*previous_len = values.len();
commands.insert_or_spawn_batch(values);
}
impl Plugin for OutlinePlugin {
fn build(&self, app: &mut App) {
load_internal_asset!(
app,
OUTLINE_SHADER_HANDLE,
"outline.wgsl",
Shader::from_wgsl
);
app.sub_app_mut(RenderApp)
.add_render_command::<Transparent3d, DrawOutline>()
.init_resource::<OutlinePipeline>()
.init_resource::<SpecializedMeshPipelines<OutlinePipeline>>()
.add_system_to_stage(RenderStage::Extract, extract_outline)
.add_system_to_stage(RenderStage::Queue, queue_outline);
}
}
type DrawOutline = (
SetItemPipeline,
SetMeshViewBindGroup<0>,
SetMeshBindGroup<1>,
DrawMesh,
);
#[allow(clippy::too_many_arguments)]
fn queue_outline(
transparent_3d_draw_functions: Res<DrawFunctions<Transparent3d>>,
outline_pipeline: Res<OutlinePipeline>,
msaa: Res<Msaa>,
mut pipelines: ResMut<SpecializedMeshPipelines<OutlinePipeline>>,
mut pipeline_cache: ResMut<PipelineCache>,
render_meshes: Res<RenderAssets<Mesh>>,
material_meshes: Query<(Entity, &MeshUniform, &Handle<Mesh>, &Outline)>,
mut views: Query<(&ExtractedView, &mut RenderPhase<Transparent3d>)>,
) {
let draw_outline = transparent_3d_draw_functions
.read()
.get_id::<DrawOutline>()
.unwrap();
let key = MeshPipelineKey::from_msaa_samples(msaa.samples)
| MeshPipelineKey::from_primitive_topology(PrimitiveTopology::TriangleList);
for (view, mut transparent_phase) in views.iter_mut() {
let view_matrix = view.transform.compute_matrix();
let view_row_2 = view_matrix.row(2);
for (entity, mesh_uniform, mesh_handle, _) in material_meshes.iter() {
if let Some(mesh) = render_meshes.get(mesh_handle) {
let pipeline = pipelines
.specialize(&mut pipeline_cache, &outline_pipeline, key, &mesh.layout)
.unwrap();
transparent_phase.add(Transparent3d {
entity,
pipeline,
draw_function: draw_outline,
distance: view_row_2.dot(mesh_uniform.transform.col(3)),
});
}
}
}
}
struct OutlinePipeline {
mesh_pipeline: MeshPipeline,
}
impl FromWorld for OutlinePipeline {
fn from_world(world: &mut World) -> Self {
let world = world.cell();
let mesh_pipeline = world.get_resource::<MeshPipeline>().unwrap().clone();
OutlinePipeline { mesh_pipeline }
}
}
impl SpecializedMeshPipeline for OutlinePipeline {
type Key = MeshPipelineKey;
fn specialize(
&self,
key: Self::Key,
layout: &MeshVertexBufferLayout,
) -> Result<RenderPipelineDescriptor, SpecializedMeshPipelineError> {
let mut descriptor = self.mesh_pipeline.specialize(key, layout)?;
descriptor.primitive.cull_mode = Some(Face::Front);
//descriptor.depth_stencil.as_mut().unwrap().depth_write_enabled = false;
//descriptor.depth_stencil.as_mut().unwrap().depth_compare = CompareFunction::Always;
descriptor.vertex.shader = OUTLINE_SHADER_HANDLE.typed();
descriptor.fragment.as_mut().unwrap().shader = OUTLINE_SHADER_HANDLE.typed();
descriptor.layout = Some(vec![
self.mesh_pipeline.view_layout.clone(),
self.mesh_pipeline.mesh_layout.clone(),
]);
Ok(descriptor)
}
}

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#import bevy_pbr::mesh_view_bind_group
#import bevy_pbr::mesh_struct
struct Vertex {
[[location(0)]] position: vec3<f32>;
[[location(1)]] normal: vec3<f32>;
};
struct VertexOutput {
[[builtin(position)]] clip_position: vec4<f32>;
};
[[group(1), binding(0)]]
var<uniform> mesh: Mesh;
fn mat4to3(m: mat4x4<f32>) -> mat3x3<f32> {
return mat3x3<f32>(
m[0].xyz, m[1].xyz, m[2].xyz
);
}
[[stage(vertex)]]
fn vertex(vertex: Vertex) -> VertexOutput {
var out: VertexOutput;
var clip_pos = view.view_proj * (mesh.model * vec4<f32>(vertex.position, 1.0));
var clip_norm = mat4to3(view.view_proj) * (mat4to3(mesh.model) * normalize(vertex.normal));
var n_pos = clip_pos + vec4<f32>(50.0 * normalize(clip_norm.xy) * clip_pos.w / vec2<f32>(view.width, view.height), 0.0, 0.0);
out.clip_position = n_pos + vec4<f32>(0.0,0.0,0.0,0.0);
return out;
}
struct FragmentInput {
[[builtin(front_facing)]] is_front: bool;
};
[[stage(fragment)]]
fn fragment(in: FragmentInput) -> [[location(0)]] vec4<f32> {
return vec4<f32>(1.0, 0.0, 0.0, 1.0);
}